/*
 * Copyright (C) 2006-2022 Apple, Inc. All rights reserved.
 * Copyright (C) 2009, 2010, 2011 Appcelerator, Inc. All rights reserved.
 * Copyright (C) 2011 Brent Fulgham. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "WebView.h"

#include "BackForwardList.h"
#include "COMVariantSetter.h"
#include "DOMCoreClasses.h"
#include "FullscreenVideoController.h"
#include "MarshallingHelpers.h"
#include "PageStorageSessionProvider.h"
#include "WebApplicationCache.h"
#include "WebBackForwardList.h"
#include "WebBroadcastChannelRegistry.h"
#include "WebChromeClient.h"
#include "WebContextMenuClient.h"
#include "WebDatabaseManager.h"
#include "WebDatabaseProvider.h"
#include "WebDocumentLoader.h"
#include "WebDownload.h"
#include "WebDragClient.h"
#include "WebEditorClient.h"
#include "WebElementPropertyBag.h"
#include "WebFrame.h"
#include "WebFrameLoaderClient.h"
#include "WebFrameNetworkingContext.h"
#include "WebGeolocationClient.h"
#include "WebGeolocationPosition.h"
#include "WebInspector.h"
#include "WebInspectorClient.h"
#include "WebKit.h"
#include "WebKitDLL.h"
#include "WebKitLogging.h"
#include "WebKitStatisticsPrivate.h"
#include "WebKitSystemBits.h"
#include "WebKitVersion.h"
#include "WebMutableURLRequest.h"
#include "WebNotificationCenter.h"
#include "WebPlatformStrategies.h"
#include "WebPluginInfoProvider.h"
#include "WebPreferences.h"
#include "WebProgressTrackerClient.h"
#include "WebResourceLoadScheduler.h"
#include "WebScriptWorld.h"
#include "WebStorageNamespaceProvider.h"
#include "WebViewGroup.h"
#include "WebVisitedLinkStore.h"
#include "resource.h"
#include <JavaScriptCore/APICast.h>
#include <JavaScriptCore/Exception.h>
#include <JavaScriptCore/HeapInlines.h>
#include <JavaScriptCore/InitializeThreading.h>
#include <JavaScriptCore/JSCJSValue.h>
#include <JavaScriptCore/JSLock.h>
#include <WebCore/AXObjectCache.h>
#include <WebCore/ApplicationCacheStorage.h>
#include <WebCore/BString.h>
#include <WebCore/BackForwardCache.h>
#include <WebCore/BackForwardController.h>
#include <WebCore/BitmapInfo.h>
#include <WebCore/CacheStorageProvider.h>
#include <WebCore/Chrome.h>
#include <WebCore/CompositionHighlight.h>
#include <WebCore/ContextMenu.h>
#include <WebCore/ContextMenuController.h>
#include <WebCore/CookieJar.h>
#include <WebCore/Cursor.h>
#include <WebCore/DatabaseManager.h>
#include <WebCore/DeprecatedGlobalSettings.h>
#include <WebCore/Document.h>
#include <WebCore/DocumentMarkerController.h>
#include <WebCore/DragController.h>
#include <WebCore/DragData.h>
#include <WebCore/DummyModelPlayerProvider.h>
#include <WebCore/DummySpeechRecognitionProvider.h>
#include <WebCore/DummyStorageProvider.h>
#include <WebCore/Editor.h>
#include <WebCore/EventHandler.h>
#include <WebCore/EventNames.h>
#include <WebCore/FloatQuad.h>
#include <WebCore/FocusController.h>
#include <WebCore/Font.h>
#include <WebCore/Frame.h>
#include <WebCore/FrameLoader.h>
#include <WebCore/FrameSelection.h>
#include <WebCore/FrameTree.h>
#include <WebCore/FrameView.h>
#include <WebCore/FrameWin.h>
#include <WebCore/FullScreenController.h>
#include <WebCore/FullscreenManager.h>
#include <WebCore/GDIObjectCounter.h>
#include <WebCore/GDIUtilities.h>
#include <WebCore/GeolocationController.h>
#include <WebCore/GeolocationError.h>
#include <WebCore/GraphicsContext.h>
#include <WebCore/GraphicsContextWin.h>
#include <WebCore/HTMLNames.h>
#include <WebCore/HTMLVideoElement.h>
#include <WebCore/HWndDC.h>
#include <WebCore/HistoryController.h>
#include <WebCore/HistoryItem.h>
#include <WebCore/HitTestRequest.h>
#include <WebCore/HitTestResult.h>
#include <WebCore/IntRect.h>
#include <WebCore/JSElement.h>
#include <WebCore/KeyboardEvent.h>
#include <WebCore/LegacySchemeRegistry.h>
#include <WebCore/LibWebRTCProvider.h>
#include <WebCore/LogInitialization.h>
#include <WebCore/Logging.h>
#include <WebCore/MIMETypeRegistry.h>
#include <WebCore/MediaRecorderProvider.h>
#include <WebCore/MemoryCache.h>
#include <WebCore/MemoryRelease.h>
#include <WebCore/NetworkStorageSession.h>
#include <WebCore/NotImplemented.h>
#include <WebCore/PageConfiguration.h>
#include <WebCore/PathUtilities.h>
#include <WebCore/PermissionController.h>
#include <WebCore/PlatformKeyboardEvent.h>
#include <WebCore/PlatformMouseEvent.h>
#include <WebCore/PlatformWheelEvent.h>
#include <WebCore/PluginData.h>
#include <WebCore/PopupMenu.h>
#include <WebCore/PopupMenuWin.h>
#include <WebCore/ProgressTracker.h>
#include <WebCore/RenderLayer.h>
#include <WebCore/RenderLayerScrollableArea.h>
#include <WebCore/RenderTheme.h>
#include <WebCore/RenderTreeAsText.h>
#include <WebCore/RenderView.h>
#include <WebCore/RenderWidget.h>
#include <WebCore/ResourceHandle.h>
#include <WebCore/ResourceHandleClient.h>
#include <WebCore/ResourceRequest.h>
#include <WebCore/RuntimeEnabledFeatures.h>
#include <WebCore/ScriptController.h>
#include <WebCore/Scrollbar.h>
#include <WebCore/ScrollbarTheme.h>
#include <WebCore/SecurityOrigin.h>
#include <WebCore/SecurityPolicy.h>
#include <WebCore/Settings.h>
#include <WebCore/ShouldTreatAsContinuingLoad.h>
#include <WebCore/SocketProvider.h>
#include <WebCore/SystemInfo.h>
#include <WebCore/TextIterator.h>
#include <WebCore/UserContentController.h>
#include <WebCore/UserScript.h>
#include <WebCore/UserStyleSheet.h>
#include <WebCore/WebCoreJITOperations.h>
#include <WebCore/WebCoreTextRenderer.h>
#include <WebCore/WindowMessageBroadcaster.h>
#include <WebCore/WindowsTouch.h>
#include <comdef.h>
#include <d2d1.h>
#include <wtf/FileSystem.h>
#include <wtf/MainThread.h>
#include <wtf/ProcessPrivilege.h>
#include <wtf/RAMSize.h>
#include <wtf/SoftLinking.h>
#include <wtf/UniqueRef.h>

#if USE(CG)
#include <CoreGraphics/CGContext.h>
#endif

#if USE(CF)
#include <CoreFoundation/CoreFoundation.h>
#endif

#if USE(CFURLCONNECTION)
#include <CFNetwork/CFURLCachePriv.h>
#include <CFNetwork/CFURLProtocolPriv.h>
#include <pal/spi/win/CFNetworkSPIWin.h>
#include <wtf/cf/CFURLExtras.h>
#elif USE(CURL)
#include <WebCore/CurlCacheManager.h>
#endif

#if USE(CA)
#include <WebCore/CACFLayerTreeHost.h>
#include <WebCore/PlatformCALayer.h>
#elif USE(TEXTURE_MAPPER_GL)
#include "AcceleratedCompositingContext.h"
#endif

#if ENABLE(FULLSCREEN_API)
#include <WebCore/FullScreenController.h>
#endif

#include <ShlObj.h>
#include <comutil.h>
#include <dimm.h>
#include <oleacc.h>
#include <wchar.h>
#include <windowsx.h>
#include <winuser.h>
#include <wtf/HashSet.h>
#include <wtf/text/CString.h>
#include <wtf/text/StringConcatenate.h>
#include <wtf/win/GDIObject.h>

#define WEBKIT_DRAWING 4

// Soft link functions for gestures and panning feedback
SOFT_LINK_LIBRARY(USER32);
SOFT_LINK_OPTIONAL(USER32, GetGestureInfo, BOOL, WINAPI, (HGESTUREINFO, PGESTUREINFO));
SOFT_LINK_OPTIONAL(USER32, SetGestureConfig, BOOL, WINAPI, (HWND, DWORD, UINT, PGESTURECONFIG, UINT));
SOFT_LINK_OPTIONAL(USER32, CloseGestureInfoHandle, BOOL, WINAPI, (HGESTUREINFO));
SOFT_LINK_LIBRARY(Uxtheme);
SOFT_LINK_OPTIONAL(Uxtheme, BeginPanningFeedback, BOOL, WINAPI, (HWND));
SOFT_LINK_OPTIONAL(Uxtheme, EndPanningFeedback, BOOL, WINAPI, (HWND, BOOL));
SOFT_LINK_OPTIONAL(Uxtheme, UpdatePanningFeedback, BOOL, WINAPI, (HWND, LONG, LONG, BOOL));

using namespace WebCore;
using JSC::JSLock;

static String webKitVersionString();

#if USE(CF)
static const CFStringRef WebKitLocalCacheDefaultsKey = CFSTR("WebKitLocalCache");
#endif
static HMODULE accessibilityLib;

static HashSet<WebView*>& pendingDeleteBackingStoreSet()
{
    static NeverDestroyed<HashSet<WebView*>> pendingDeleteBackingStoreSet;
    return pendingDeleteBackingStoreSet;
}

WebView* kit(Page* page)
{
    if (!page)
        return nullptr;
    
    if (page->chrome().client().isEmptyChromeClient())
        return nullptr;
    
    return static_cast<WebChromeClient&>(page->chrome().client()).webView();
}

static inline AtomString toAtomString(BSTR bstr)
{
    return AtomString(bstr, SysStringLen(bstr));
}

static inline String toString(BSTR bstr)
{
    return String(bstr, SysStringLen(bstr));
}

static inline String toString(BString &bstr)
{
    return String(bstr, SysStringLen(bstr));
}

static inline URL toURL(BSTR bstr)
{
    return URL { toString(bstr) };
}

static String localStorageDatabasePath(WebPreferences* preferences)
{
    BString localStorageDatabasePath;
    if (FAILED(preferences->localStorageDatabasePath(&localStorageDatabasePath)))
        return String();

    return toString(localStorageDatabasePath);
}

class PreferencesChangedOrRemovedObserver final : public IWebNotificationObserver {
public:
    static PreferencesChangedOrRemovedObserver* sharedInstance();

private:
    PreferencesChangedOrRemovedObserver() {}
    ~PreferencesChangedOrRemovedObserver() {}

    virtual HRESULT STDMETHODCALLTYPE QueryInterface(_In_ REFIID, _Outptr_ void**) { return E_FAIL; }
    virtual ULONG STDMETHODCALLTYPE AddRef() { return 0; }
    virtual ULONG STDMETHODCALLTYPE Release() { return 0; }

public:
    // IWebNotificationObserver
    virtual HRESULT STDMETHODCALLTYPE onNotify( 
        /* [in] */ IWebNotification* notification);

private:
    HRESULT notifyPreferencesChanged(WebCacheModel);
    HRESULT notifyPreferencesRemoved(WebCacheModel);
};

PreferencesChangedOrRemovedObserver* PreferencesChangedOrRemovedObserver::sharedInstance()
{
    static PreferencesChangedOrRemovedObserver* shared = new PreferencesChangedOrRemovedObserver;
    return shared;
}

HRESULT PreferencesChangedOrRemovedObserver::onNotify(IWebNotification* notification)
{
    HRESULT hr = S_OK;

    COMPtr<IUnknown> unkPrefs;
    hr = notification->getObject(&unkPrefs);
    if (FAILED(hr))
        return hr;

    COMPtr<IWebPreferences> preferences(Query, unkPrefs);
    if (!preferences)
        return E_NOINTERFACE;

    WebCacheModel cacheModel;
    hr = preferences->cacheModel(&cacheModel);
    if (FAILED(hr))
        return hr;

    BString name;
    hr = notification->name(&name);
    if (FAILED(hr))
        return hr;

    if (wcscmp(name, WebPreferences::webPreferencesChangedNotification()) == 0)
        return notifyPreferencesChanged(cacheModel);

    if (wcscmp(name, WebPreferences::webPreferencesRemovedNotification()) == 0)
        return notifyPreferencesRemoved(cacheModel);

    ASSERT_NOT_REACHED();
    return E_FAIL;
}

HRESULT PreferencesChangedOrRemovedObserver::notifyPreferencesChanged(WebCacheModel cacheModel)
{
    HRESULT hr = S_OK;

    if (!WebView::didSetCacheModel() || cacheModel > WebView::cacheModel())
        WebView::setCacheModel(cacheModel);
    else if (cacheModel < WebView::cacheModel()) {
        WebCacheModel sharedPreferencesCacheModel;
        hr = WebPreferences::sharedStandardPreferences()->cacheModel(&sharedPreferencesCacheModel);
        if (FAILED(hr))
            return hr;
        WebView::setCacheModel(std::max(sharedPreferencesCacheModel, WebView::maxCacheModelInAnyInstance()));
    }

    return hr;
}

HRESULT PreferencesChangedOrRemovedObserver::notifyPreferencesRemoved(WebCacheModel cacheModel)
{
    HRESULT hr = S_OK;

    if (cacheModel == WebView::cacheModel()) {
        WebCacheModel sharedPreferencesCacheModel;
        hr = WebPreferences::sharedStandardPreferences()->cacheModel(&sharedPreferencesCacheModel);
        if (FAILED(hr))
            return hr;
        WebView::setCacheModel(std::max(sharedPreferencesCacheModel, WebView::maxCacheModelInAnyInstance()));
    }

    return hr;
}


const LPCWSTR kWebViewWindowClassName = L"WebViewWindowClass";

const int WM_XP_THEMECHANGED = 0x031A;
const int WM_VISTA_MOUSEHWHEEL = 0x020E;
#ifndef WM_DPICHANGED
const int WM_DPICHANGED = 0x02E0;
#endif

static const int maxToolTipWidth = 250;

static const int delayBeforeDeletingBackingStoreMsec = 5000;

static void initializeStaticObservers();

static HRESULT updateSharedSettingsFromPreferencesIfNeeded(IWebPreferences*);

HRESULT createMatchEnumerator(Vector<IntRect>* rects, IEnumTextMatches** matches);

static bool continuousSpellCheckingEnabled;
static bool grammarCheckingEnabled;

static bool s_didSetCacheModel;
static WebCacheModel s_cacheModel = WebCacheModelDocumentViewer;

enum {
    UpdateActiveStateTimer = 1,
    DeleteBackingStoreTimer = 2,
};

// WebView ----------------------------------------------------------------

bool WebView::s_allowSiteSpecificHacks = false;

WebView::WebView()
{
    JSC::initialize();
    WTF::initializeMainThread();
    WTF::setProcessPrivileges(allPrivileges());
    WebCore::populateJITOperations();
    WebCore::NetworkStorageSession::permitProcessToUseCookieAPI(true);

    m_backingStoreSize.cx = m_backingStoreSize.cy = 0;

    CoCreateInstance(CLSID_DragDropHelper, 0, CLSCTX_INPROC_SERVER, IID_IDropTargetHelper,(void**)&m_dropTargetHelper);

    initializeStaticObservers();

    WebPreferences* sharedPreferences = WebPreferences::sharedStandardPreferences();
    BOOL enabled = FALSE;
    if (SUCCEEDED(sharedPreferences->continuousSpellCheckingEnabled(&enabled)))
        continuousSpellCheckingEnabled = !!enabled;
    if (SUCCEEDED(sharedPreferences->grammarCheckingEnabled(&enabled)))
        grammarCheckingEnabled = !!enabled;

    m_webViewGroup = WebViewGroup::getOrCreate(String(), localStorageDatabasePath(sharedPreferences));
    m_webViewGroup->addWebView(this);

    WebViewCount++;
    gClassCount++;
    gClassNameCount().add("WebView"_s);
}

WebView::~WebView()
{
    deleteBackingStore();

    // the tooltip window needs to be explicitly destroyed since it isn't a WS_CHILD
    if (::IsWindow(m_toolTipHwnd))
        ::DestroyWindow(m_toolTipHwnd);

    ASSERT(!m_page);
    ASSERT(!m_preferences);
    ASSERT(!m_viewWindow);

#if USE(CA)
    ASSERT(!m_layerTreeHost);
#endif

    m_webViewGroup->removeWebView(this);

    WebViewCount--;
    gClassCount--;
    gClassNameCount().remove("WebView"_s);
}

WebView* WebView::createInstance()
{
    WebView* instance = new WebView();
    instance->AddRef();
    return instance;
}

void initializeStaticObservers()
{
    static bool initialized = false;
    if (initialized)
        return;
    initialized = true;

    IWebNotificationCenter* notifyCenter = WebNotificationCenter::defaultCenterInternal();
    notifyCenter->addObserver(PreferencesChangedOrRemovedObserver::sharedInstance(), WebPreferences::webPreferencesChangedNotification(), 0);
    notifyCenter->addObserver(PreferencesChangedOrRemovedObserver::sharedInstance(), WebPreferences::webPreferencesRemovedNotification(), 0);
}

static HashSet<WebView*>& allWebViewsSet()
{
    static HashSet<WebView*> allWebViewsSet;
    return allWebViewsSet;
}

void WebView::addToAllWebViewsSet()
{
    allWebViewsSet().add(this);
}

void WebView::removeFromAllWebViewsSet()
{
    allWebViewsSet().remove(this);
}

void WebView::setCacheModel(WebCacheModel cacheModel)
{
    if (s_didSetCacheModel && cacheModel == s_cacheModel)
        return;

    String cacheDirectory;

#if USE(CFURLCONNECTION)
    RetainPtr<CFURLCacheRef> cfurlCache = adoptCF(CFURLCacheCopySharedURLCache());
    RetainPtr<CFStringRef> cfurlCacheDirectory = adoptCF(_CFURLCacheCopyCacheDirectory(cfurlCache.get()));
    if (!cfurlCacheDirectory) {
        RetainPtr<CFPropertyListRef> preference = adoptCF(CFPreferencesCopyAppValue(WebKitLocalCacheDefaultsKey, WebPreferences::applicationId()));
        if (preference && (CFStringGetTypeID() == CFGetTypeID(preference.get())))
            cfurlCacheDirectory = adoptCF(static_cast<CFStringRef>(preference.leakRef()));
        else
            cfurlCacheDirectory = FileSystem::localUserSpecificStorageDirectory().createCFString();
    }
    cacheDirectory = String(cfurlCacheDirectory.get());
    CFIndex cacheMemoryCapacity = 0;
    CFIndex cacheDiskCapacity = 0;
#elif USE(CURL)
    cacheDirectory = CurlCacheManager::singleton().cacheDirectory();
    long cacheMemoryCapacity = 0;
    long cacheDiskCapacity = 0;
#endif

    unsigned long long memSize = ramSize() / 1024 / 1024;

    // As a fudge factor, use 1000 instead of 1024, in case the reported byte 
    // count doesn't align exactly to a megabyte boundary.
    unsigned long long diskFreeSize = WebVolumeFreeSize(cacheDirectory) / 1024 / 1000;

    unsigned cacheTotalCapacity = 0;
    unsigned cacheMinDeadCapacity = 0;
    unsigned cacheMaxDeadCapacity = 0;
    Seconds deadDecodedDataDeletionInterval;

    unsigned backForwardCacheSize = 0;


    switch (cacheModel) {
    case WebCacheModelDocumentViewer: {
        // Back/forward cache capacity (in pages)
        backForwardCacheSize = 0;

        // Object cache capacities (in bytes)
        if (memSize >= 2048)
            cacheTotalCapacity = 96 * 1024 * 1024;
        else if (memSize >= 1536)
            cacheTotalCapacity = 64 * 1024 * 1024;
        else if (memSize >= 1024)
            cacheTotalCapacity = 32 * 1024 * 1024;
        else if (memSize >= 512)
            cacheTotalCapacity = 16 * 1024 * 1024; 

        cacheMinDeadCapacity = 0;
        cacheMaxDeadCapacity = 0;

        // Memory cache capacity (in bytes)
        cacheMemoryCapacity = 0;

#if USE(CFURLCONNECTION)
        // Foundation disk cache capacity (in bytes)
        cacheDiskCapacity = CFURLCacheDiskCapacity(cfurlCache.get());
#endif
        break;
    }
    case WebCacheModelDocumentBrowser: {
        // Back/forward cache capacity (in pages)
        if (memSize >= 1024)
            backForwardCacheSize = 3;
        else if (memSize >= 512)
            backForwardCacheSize = 2;
        else if (memSize >= 256)
            backForwardCacheSize = 1;
        else
            backForwardCacheSize = 0;

        // Object cache capacities (in bytes)
        if (memSize >= 2048)
            cacheTotalCapacity = 96 * 1024 * 1024;
        else if (memSize >= 1536)
            cacheTotalCapacity = 64 * 1024 * 1024;
        else if (memSize >= 1024)
            cacheTotalCapacity = 32 * 1024 * 1024;
        else if (memSize >= 512)
            cacheTotalCapacity = 16 * 1024 * 1024; 

        cacheMinDeadCapacity = cacheTotalCapacity / 8;
        cacheMaxDeadCapacity = cacheTotalCapacity / 4;

        // Memory cache capacity (in bytes)
        if (memSize >= 2048)
            cacheMemoryCapacity = 4 * 1024 * 1024;
        else if (memSize >= 1024)
            cacheMemoryCapacity = 2 * 1024 * 1024;
        else if (memSize >= 512)
            cacheMemoryCapacity = 1 * 1024 * 1024;
        else
            cacheMemoryCapacity =      512 * 1024; 

        // Disk cache capacity (in bytes)
        if (diskFreeSize >= 16384)
            cacheDiskCapacity = 50 * 1024 * 1024;
        else if (diskFreeSize >= 8192)
            cacheDiskCapacity = 40 * 1024 * 1024;
        else if (diskFreeSize >= 4096)
            cacheDiskCapacity = 30 * 1024 * 1024;
        else
            cacheDiskCapacity = 20 * 1024 * 1024;

        break;
    }
    case WebCacheModelPrimaryWebBrowser: {
        // Back/forward cache capacity (in pages)
        // (Research indicates that value / page drops substantially after 3 pages.)
        if (memSize >= 2048)
            backForwardCacheSize = 5;
        else if (memSize >= 1024)
            backForwardCacheSize = 4;
        else if (memSize >= 512)
            backForwardCacheSize = 3;
        else if (memSize >= 256)
            backForwardCacheSize = 2;
        else
            backForwardCacheSize = 1;

        // Object cache capacities (in bytes)
        // (Testing indicates that value / MB depends heavily on content and
        // browsing pattern. Even growth above 128MB can have substantial 
        // value / MB for some content / browsing patterns.)
        if (memSize >= 2048)
            cacheTotalCapacity = 128 * 1024 * 1024;
        else if (memSize >= 1536)
            cacheTotalCapacity = 96 * 1024 * 1024;
        else if (memSize >= 1024)
            cacheTotalCapacity = 64 * 1024 * 1024;
        else if (memSize >= 512)
            cacheTotalCapacity = 32 * 1024 * 1024; 

        cacheMinDeadCapacity = cacheTotalCapacity / 4;
        cacheMaxDeadCapacity = cacheTotalCapacity / 2;

        // This code is here to avoid a PLT regression. We can remove it if we
        // can prove that the overall system gain would justify the regression.
        cacheMaxDeadCapacity = std::max(24u, cacheMaxDeadCapacity);

        deadDecodedDataDeletionInterval = 60_s;

        // Memory cache capacity (in bytes)
        // (These values are small because WebCore does most caching itself.)
        if (memSize >= 1024)
            cacheMemoryCapacity = 4 * 1024 * 1024;
        else if (memSize >= 512)
            cacheMemoryCapacity = 2 * 1024 * 1024;
        else if (memSize >= 256)
            cacheMemoryCapacity = 1 * 1024 * 1024;
        else
            cacheMemoryCapacity =      512 * 1024; 

        // Disk cache capacity (in bytes)
        if (diskFreeSize >= 16384)
            cacheDiskCapacity = 175 * 1024 * 1024;
        else if (diskFreeSize >= 8192)
            cacheDiskCapacity = 150 * 1024 * 1024;
        else if (diskFreeSize >= 4096)
            cacheDiskCapacity = 125 * 1024 * 1024;
        else if (diskFreeSize >= 2048)
            cacheDiskCapacity = 100 * 1024 * 1024;
        else if (diskFreeSize >= 1024)
            cacheDiskCapacity = 75 * 1024 * 1024;
        else
            cacheDiskCapacity = 50 * 1024 * 1024;

        break;
    }
    default:
        ASSERT_NOT_REACHED();
    }

    auto& memoryCache = MemoryCache::singleton();
    memoryCache.setCapacities(cacheMinDeadCapacity, cacheMaxDeadCapacity, cacheTotalCapacity);
    memoryCache.setDeadDecodedDataDeletionInterval(deadDecodedDataDeletionInterval);
    BackForwardCache::singleton().setMaxSize(backForwardCacheSize);

#if USE(CFURLCONNECTION)
    // Don't shrink a big disk cache, since that would cause churn.
    cacheDiskCapacity = std::max(cacheDiskCapacity, CFURLCacheDiskCapacity(cfurlCache.get()));

    CFURLCacheSetMemoryCapacity(cfurlCache.get(), cacheMemoryCapacity);
    CFURLCacheSetDiskCapacity(cfurlCache.get(), cacheDiskCapacity);
#elif USE(CURL)
    CurlCacheManager::singleton().setStorageSizeLimit(cacheDiskCapacity);
#endif

    s_didSetCacheModel = true;
    s_cacheModel = cacheModel;
    return;
}

WebCacheModel WebView::cacheModel()
{
    return s_cacheModel;
}

bool WebView::didSetCacheModel()
{
    return s_didSetCacheModel;
}

WebCacheModel WebView::maxCacheModelInAnyInstance()
{
    WebCacheModel cacheModel = WebCacheModelDocumentViewer;

    HashSet<WebView*>::iterator end = allWebViewsSet().end();
    for (HashSet<WebView*>::iterator it = allWebViewsSet().begin(); it != end; ++it) {
        COMPtr<IWebPreferences> pref;
        if (FAILED((*it)->preferences(&pref)))
            continue;
        WebCacheModel prefCacheModel = WebCacheModelDocumentViewer;
        if (FAILED(pref->cacheModel(&prefCacheModel)))
            continue;

        cacheModel = std::max(cacheModel, prefCacheModel);
    }

    return cacheModel;
}

HRESULT WebView::close()
{
    if (m_didClose)
        return S_OK;

    m_didClose = true;

    setAcceleratedCompositing(false);

    WebNotificationCenter::defaultCenterInternal()->postNotificationName(_bstr_t(WebViewWillCloseNotification).GetBSTR(), static_cast<IWebView*>(this), 0);

    if (m_uiDelegatePrivate)
        m_uiDelegatePrivate->webViewClosing(this);

    removeFromAllWebViewsSet();

    if (m_page)
        m_page->mainFrame().loader().detachFromParent();

    if (m_mouseOutTracker) {
        m_mouseOutTracker->dwFlags = TME_CANCEL;
        ::TrackMouseEvent(m_mouseOutTracker.get());
        m_mouseOutTracker.reset();
    }
    
    revokeDragDrop();

    if (m_viewWindow) {
        // We can't check IsWindow(m_viewWindow) here, because that will return true even while
        // we're already handling WM_DESTROY. So we check !isBeingDestroyed() instead.
        if (!isBeingDestroyed())
            DestroyWindow(m_viewWindow);
        // Either we just destroyed m_viewWindow, or it's in the process of being destroyed. Either
        // way, we clear it out to make sure we don't try to use it later.
        m_viewWindow = 0;
    }

    setHostWindow(0);

    setAccessibilityDelegate(0);
    setDownloadDelegate(0);
    setEditingDelegate(0);
    setFrameLoadDelegate(0);
    setFrameLoadDelegatePrivate(0);
    setHistoryDelegate(0);
    setPolicyDelegate(0);
    setResourceLoadDelegate(0);
    setUIDelegate(0);
    setFormDelegate(0);

    m_inspectorClient = nullptr;
    if (m_webInspector)
        m_webInspector->inspectedWebViewClosed();

    delete m_page;
    m_page = nullptr;

    m_mainFrame = nullptr;

    IWebNotificationCenter* notifyCenter = WebNotificationCenter::defaultCenterInternal();
    notifyCenter->removeObserver(this, WebPreferences::webPreferencesChangedNotification(), static_cast<IWebPreferences*>(m_preferences.get()));

    if (COMPtr<WebPreferences> preferences = m_preferences) {
        BString identifier;
        preferences->identifier(&identifier);

        m_preferences = 0;
        preferences->didRemoveFromWebView();
        // Make sure we release the reference, since WebPreferences::removeReferenceForIdentifier will check for last reference to WebPreferences
        preferences = 0;
        if (identifier)
            WebPreferences::removeReferenceForIdentifier(identifier);
    }

    deleteBackingStore();
    return S_OK;
}

void WebView::repaint(const WebCore::IntRect& logicalWindowRect, bool contentChanged, bool immediate, bool repaintContentOnly)
{
    FloatRect windowRectFloat(logicalWindowRect);
    windowRectFloat.scale(deviceScaleFactor());
    IntRect windowRect(enclosingIntRect(windowRectFloat));

    if (isAcceleratedCompositing()) {
        // The contentChanged, immediate, and repaintContentOnly parameters are all based on a non-
        // compositing painting/scrolling model.
        addToDirtyRegion(logicalWindowRect);
        return;
    }

    if (!repaintContentOnly) {
        RECT rect = windowRect;
        ::InvalidateRect(m_viewWindow, &rect, false);
    }
    if (contentChanged)
        addToDirtyRegion(windowRect);
    if (immediate) {
        if (repaintContentOnly)
            updateBackingStore(core(topLevelFrame())->view());
        else
            ::UpdateWindow(m_viewWindow);
    }
    m_needsDisplay = true;
}

void WebView::deleteBackingStore()
{
    pendingDeleteBackingStoreSet().remove(this);

    if (m_deleteBackingStoreTimerActive) {
        KillTimer(m_viewWindow, DeleteBackingStoreTimer);
        m_deleteBackingStoreTimerActive = false;
    }
    m_backingStoreBitmap = nullptr;
    m_backingStoreDirtyRegion = nullptr;
    m_backingStoreSize.cx = m_backingStoreSize.cy = 0;
}

bool WebView::ensureBackingStore()
{
    RECT windowRect;
    ::GetClientRect(m_viewWindow, &windowRect);
    LONG width = windowRect.right - windowRect.left;
    LONG height = windowRect.bottom - windowRect.top;
    if (width > 0 && height > 0 && (width != m_backingStoreSize.cx || height != m_backingStoreSize.cy)) {
        deleteBackingStore();

        m_backingStoreSize.cx = width;
        m_backingStoreSize.cy = height;
        BitmapInfo bitmapInfo = BitmapInfo::createBottomUp(IntSize(m_backingStoreSize));

        void* pixels = NULL;
        m_backingStoreBitmap = SharedGDIObject<HBITMAP>::create(adoptGDIObject(::CreateDIBSection(0, &bitmapInfo, DIB_RGB_COLORS, &pixels, 0, 0)));

        return true;
    }

    return false;
}

void WebView::addToDirtyRegion(const IntRect& dirtyRect)
{
    m_needsDisplay = true;

    // FIXME: We want an assert here saying that the dirtyRect is inside the clienRect,
    // but it was being hit during our layout tests, and is being investigated in
    // http://webkit.org/b/29350.

    if (isAcceleratedCompositing()) {
#if USE(CA)
        m_backingLayer->setNeedsDisplayInRect(dirtyRect);
#elif USE(TEXTURE_MAPPER_GL)
        m_acceleratedCompositingContext->setNonCompositedContentsNeedDisplay(dirtyRect);
#endif
        return;
    }

    auto newRegion = adoptGDIObject(::CreateRectRgn(dirtyRect.x(), dirtyRect.y(),
        dirtyRect.maxX(), dirtyRect.maxY()));
    addToDirtyRegion(WTFMove(newRegion));
}

void WebView::addToDirtyRegion(GDIObject<HRGN> newRegion)
{
    m_needsDisplay = true;

    ASSERT(!isAcceleratedCompositing());

    LOCAL_GDI_COUNTER(0, __FUNCTION__);

    if (m_backingStoreDirtyRegion) {
        auto combinedRegion = adoptGDIObject(::CreateRectRgn(0, 0, 0, 0));
        ::CombineRgn(combinedRegion.get(), m_backingStoreDirtyRegion->get(), newRegion.get(), RGN_OR);
        m_backingStoreDirtyRegion = SharedGDIObject<HRGN>::create(WTFMove(combinedRegion));
    } else
        m_backingStoreDirtyRegion = SharedGDIObject<HRGN>::create(WTFMove(newRegion));

    if (m_uiDelegatePrivate)
        m_uiDelegatePrivate->webViewDidInvalidate(this);
}

void WebView::scrollBackingStore(FrameView* frameView, int logicalDx, int logicalDy, const IntRect& logicalScrollViewRect, const IntRect& logicalClipRect)
{
    if (deviceScaleFactor() != static_cast<int>(deviceScaleFactor())) {
        // Non-integral device scale factors are causing repaint glitches, because the computation of the scroll
        // delta in pixel coordinates from the scroll delta in logical coordinates will not always be correct.
        // Instead of blitting the scroll rectangle, repaint the entire region affected by scrolling.
        // FIXME: This is inefficient, we should be able to blit the scroll rectangle in this case as well,
        // see https://bugs.webkit.org/show_bug.cgi?id=193542.
        IntRect repaintRect = logicalScrollViewRect;
        repaintRect.move(logicalDx, logicalDy);
        repaintRect.unite(logicalScrollViewRect);
        repaint(repaintRect, true);
        return;
    }

    m_needsDisplay = true;

    // Dimensions passed to us from WebCore are in logical units. We must convert to pixels:
    float scaleFactor = deviceScaleFactor();
    int dx = clampTo<int>(scaleFactor * logicalDx);
    int dy = clampTo<int>(scaleFactor * logicalDy);
    FloatRect scrollViewRectFloat(logicalScrollViewRect);
    scrollViewRectFloat.scale(scaleFactor);
    IntRect scrollViewRect(enclosingIntRect(scrollViewRectFloat));
    FloatRect clipRect(logicalClipRect);
    clipRect.scale(scaleFactor);

    if (isAcceleratedCompositing()) {
        // FIXME: We should be doing something smarter here, like moving tiles around and painting
        // any newly-exposed tiles. <http://webkit.org/b/52714>
#if USE(CA)
        m_backingLayer->setNeedsDisplayInRect(scrollViewRect);
#elif USE(TEXTURE_MAPPER_GL)
        m_acceleratedCompositingContext->scrollNonCompositedContents(scrollViewRect, IntSize(dx, dy));
#endif
        return;
    }

    LOCAL_GDI_COUNTER(0, __FUNCTION__);

    // If there's no backing store we don't need to update it
    if (!m_backingStoreBitmap) {
        if (m_uiDelegatePrivate)
            m_uiDelegatePrivate->webViewScrolled(this);

        return;
    }

    // Make a region to hold the invalidated scroll area.
    auto updateRegion = adoptGDIObject(::CreateRectRgn(0, 0, 0, 0));

    // Collect our device context info and select the bitmap to scroll.
    HWndDC windowDC(m_viewWindow);
    auto bitmapDC = adoptGDIObject(::CreateCompatibleDC(windowDC));
    HGDIOBJ oldBitmap = ::SelectObject(bitmapDC.get(), m_backingStoreBitmap->get());
    ASSERT(oldBitmap);

    // Scroll the bitmap.
    RECT scrollRectWin(scrollViewRect);
    RECT clipRectWin(enclosingIntRect(clipRect));
    ::ScrollDC(bitmapDC.get(), dx, dy, &scrollRectWin, &clipRectWin, updateRegion.get(), 0);
    RECT regionBox;
    ::GetRgnBox(updateRegion.get(), &regionBox);

    // Flush.
    GdiFlush();

    // Add the dirty region to the backing store's dirty region.
    addToDirtyRegion(WTFMove(updateRegion));

    if (m_uiDelegatePrivate)
        m_uiDelegatePrivate->webViewScrolled(this);

    // Update the backing store.
    updateBackingStore(frameView, bitmapDC.get(), false);

    // Clean up.
    ::SelectObject(bitmapDC.get(), oldBitmap);
}

void WebView::sizeChanged(const IntSize& newSize)
{
    m_needsDisplay = true;

    deleteBackingStore();

    if (Frame* coreFrame = core(topLevelFrame())) {
        FloatSize logicalSize = newSize;
        logicalSize.scale(1.0f / deviceScaleFactor());
        auto clientRect = enclosingIntRect(FloatRect(FloatPoint(), logicalSize));
        coreFrame->view()->resize(clientRect.size());
    }

#if USE(CA)
    if (m_layerTreeHost)
        m_layerTreeHost->resize();

    if (m_backingLayer) {
        m_backingLayer->setSize(newSize);
        m_backingLayer->setNeedsDisplay();
    }
#elif USE(TEXTURE_MAPPER_GL)
    if (m_acceleratedCompositingContext)
        m_acceleratedCompositingContext->resizeRootLayer(newSize);
#endif
}

bool WebView::dpiChanged(float, const WebCore::IntSize& newSize)
{
    if (!IsProcessDPIAware())
        return false;

    sizeChanged(newSize);

    return true;
}

// This emulates the Mac smarts for painting rects intelligently.  This is very
// important for us, since we double buffer based off dirty rects.
static void getUpdateRects(HRGN region, const IntRect& dirtyRect, Vector<IntRect>& rects)
{
    ASSERT_ARG(region, region);

    const int cRectThreshold = 10;
    const float cWastedSpaceThreshold = 0.75f;

    rects.clear();

    DWORD regionDataSize = GetRegionData(region, sizeof(RGNDATA), NULL);
    if (!regionDataSize) {
        rects.append(dirtyRect);
        return;
    }

    Vector<unsigned char> buffer(regionDataSize);
    RGNDATA* regionData = reinterpret_cast<RGNDATA*>(buffer.data());
    GetRegionData(region, regionDataSize, regionData);
    if (regionData->rdh.nCount > cRectThreshold) {
        rects.append(dirtyRect);
        return;
    }

    double singlePixels = 0.0;
    unsigned i;
    RECT* rect;
    for (i = 0, rect = reinterpret_cast<RECT*>(regionData->Buffer); i < regionData->rdh.nCount; i++, rect++)
        singlePixels += (rect->right - rect->left) * (rect->bottom - rect->top);

    double unionPixels = dirtyRect.width() * dirtyRect.height();
    double wastedSpace = 1.0 - (singlePixels / unionPixels);
    if (wastedSpace <= cWastedSpaceThreshold) {
        rects.append(dirtyRect);
        return;
    }

    for (i = 0, rect = reinterpret_cast<RECT*>(regionData->Buffer); i < regionData->rdh.nCount; i++, rect++)
        rects.append(*rect);
}

void WebView::updateBackingStore(FrameView* frameView, HDC dc, bool backingStoreCompletelyDirty)
{
    ASSERT(!isAcceleratedCompositing());

    LOCAL_GDI_COUNTER(0, __FUNCTION__);

    GDIObject<HDC> bitmapDCObject;

    HDC bitmapDC = dc;
    HGDIOBJ oldBitmap = 0;
    if (!dc) {
        HWndDC windowDC(m_viewWindow);
        bitmapDCObject = adoptGDIObject(::CreateCompatibleDC(windowDC));
        bitmapDC = bitmapDCObject.get();
        oldBitmap = ::SelectObject(bitmapDC, m_backingStoreBitmap->get());
        ASSERT(oldBitmap);
    }

    if (m_backingStoreBitmap && (m_backingStoreDirtyRegion || backingStoreCompletelyDirty)) {
        Vector<IntRect> paintRects;
        if (!backingStoreCompletelyDirty && m_backingStoreDirtyRegion) {
            RECT regionBox;
            ::GetRgnBox(m_backingStoreDirtyRegion->get(), &regionBox);
            getUpdateRects(m_backingStoreDirtyRegion->get(), regionBox, paintRects);
        } else {
            RECT clientRect;
            ::GetClientRect(m_viewWindow, &clientRect);
            paintRects.append(clientRect);
        }

        for (unsigned i = 0; i < paintRects.size(); ++i)
            paintIntoBackingStore(frameView, bitmapDC, paintRects[i]);

        if (m_uiDelegatePrivate)
            m_uiDelegatePrivate->webViewPainted(this);

        m_backingStoreDirtyRegion = nullptr;
    }

    if (!dc)
        ::SelectObject(bitmapDC, oldBitmap);

    GdiFlush();

    m_needsDisplay = true;
}

void WebView::performLayeredWindowUpdate()
{
    // The backing store may have been destroyed if the window rect was set to zero height or zero width.
    if (!m_backingStoreBitmap)
        return;

    HWndDC hdcScreen(m_viewWindow);
    auto hdcMem = adoptGDIObject(::CreateCompatibleDC(hdcScreen));
    HBITMAP hbmOld = static_cast<HBITMAP>(::SelectObject(hdcMem.get(), m_backingStoreBitmap->get()));

    BITMAP bmpInfo;
    ::GetObject(m_backingStoreBitmap->get(), sizeof(bmpInfo), &bmpInfo);
    SIZE windowSize = { bmpInfo.bmWidth, bmpInfo.bmHeight };

    BLENDFUNCTION blendFunction;
    blendFunction.BlendOp = AC_SRC_OVER;
    blendFunction.BlendFlags = 0;
    blendFunction.SourceConstantAlpha = 0xFF;
    blendFunction.AlphaFormat = AC_SRC_ALPHA;

    POINT layerPos = { 0, 0 };
    ::UpdateLayeredWindow(m_viewWindow, hdcScreen, 0, &windowSize, hdcMem.get(), &layerPos, 0, &blendFunction, ULW_ALPHA);

    ::SelectObject(hdcMem.get(), hbmOld);

    m_needsDisplay = false;
}

void WebView::paint(HDC dc, LPARAM options)
{
    LOCAL_GDI_COUNTER(0, __FUNCTION__);

    m_page->isolatedUpdateRendering();

    if (paintCompositedContentToHDC(dc)) {
        ::ValidateRect(m_viewWindow, nullptr);
        return;
    }

    Frame* coreFrame = core(m_mainFrame);
    if (!coreFrame)
        return;
    FrameView* frameView = coreFrame->view();

    RECT rcPaint;
    HDC hdc;
    GDIObject<HRGN> region;
    int regionType = NULLREGION;
    PAINTSTRUCT ps;
    if (!dc) {
        region = adoptGDIObject(::CreateRectRgn(0, 0, 0, 0));
        regionType = GetUpdateRgn(m_viewWindow, region.get(), false);
        hdc = BeginPaint(m_viewWindow, &ps);
        rcPaint = ps.rcPaint;
    } else {
        hdc = dc;
        ::GetClientRect(m_viewWindow, &rcPaint);
        if (options & PRF_ERASEBKGND)
            ::FillRect(hdc, &rcPaint, (HBRUSH)GetStockObject(WHITE_BRUSH));
    }

    bool backingStoreCompletelyDirty = ensureBackingStore();
    if (!m_backingStoreBitmap) {
        if (!dc)
            EndPaint(m_viewWindow, &ps);
        return;
    }

    auto bitmapDC = adoptGDIObject(::CreateCompatibleDC(hdc));
    HGDIOBJ oldBitmap = ::SelectObject(bitmapDC.get(), m_backingStoreBitmap->get());

    // Update our backing store if needed.
    updateBackingStore(frameView, bitmapDC.get(), backingStoreCompletelyDirty);

    // Now we blit the updated backing store
    IntRect windowDirtyRect = rcPaint;
    
    // Apply the same heuristic for this update region too.
    Vector<IntRect> blitRects;
    if (region && regionType == COMPLEXREGION)
        getUpdateRects(region.get(), windowDirtyRect, blitRects);
    else
        blitRects.append(windowDirtyRect);

    for (unsigned i = 0; i < blitRects.size(); ++i)
        paintIntoWindow(bitmapDC.get(), hdc, blitRects[i]);

    ::SelectObject(bitmapDC.get(), oldBitmap);

    if (!dc)
        EndPaint(m_viewWindow, &ps);

    if (active())
        cancelDeleteBackingStoreSoon();
    else
        deleteBackingStoreSoon();
}

void WebView::paintIntoBackingStore(FrameView* frameView, HDC bitmapDC, const IntRect& dirtyRectPixels)
{
    // FIXME: This function should never be called in accelerated compositing mode, and we should
    // assert as such. But currently it *is* sometimes called, so we can't assert yet. See
    // <http://webkit.org/b/58539>.

    LOCAL_GDI_COUNTER(0, __FUNCTION__);

    // FIXME: We want an assert here saying that the dirtyRect is inside the clienRect,
    // but it was being hit during our layout tests, and is being investigated in
    // http://webkit.org/b/29350.

    RECT rect = dirtyRectPixels;

    if (!bitmapDC)
        return;
    
#if FLASH_BACKING_STORE_REDRAW
    {
        HWndDC dc(m_viewWindow);
        auto yellowBrush = adoptGDIObject(::CreateSolidBrush(RGB(255, 255, 0)));
        FillRect(dc, &rect, yellowBrush.get());
        GdiFlush();
        Sleep(50);
        paintIntoWindow(bitmapDC, dc, dirtyRectPixels);
    }
#endif

    float scaleFactor = deviceScaleFactor();
    float inverseScaleFactor = 1.0f / scaleFactor;

    FloatRect logicalDirtyRectFloat = dirtyRectPixels;
    logicalDirtyRectFloat.scale(inverseScaleFactor);    
    IntRect logicalDirtyRect(enclosingIntRect(logicalDirtyRectFloat));

    GraphicsContextWin gc(bitmapDC, m_transparent);
    gc.save();
    if (m_transparent)
        gc.clearRect(logicalDirtyRect);
    else
        FillRect(bitmapDC, &rect, (HBRUSH)GetStockObject(WHITE_BRUSH));

    COMPtr<IWebUIDelegatePrivate2> uiPrivate(Query, m_uiDelegate);
    if (uiPrivate)
        uiPrivate->drawBackground(this, bitmapDC, &rect);

    if (frameView && frameView->frame().contentRenderer()) {
        gc.save();
        gc.scale(FloatSize(scaleFactor, scaleFactor));
        gc.clip(logicalDirtyRect);
        frameView->paint(gc, logicalDirtyRect);
        if (m_shouldInvertColors)
            gc.fillRect(logicalDirtyRect, Color::white, CompositeOperator::Difference);
        gc.restore();
    }
    gc.restore();
}

void WebView::paintIntoWindow(HDC bitmapDC, HDC windowDC, const IntRect& dirtyRectPixels)
{
    // FIXME: This function should never be called in accelerated compositing mode, and we should
    // assert as such. But currently it *is* sometimes called, so we can't assert yet. See
    // <http://webkit.org/b/58539>.

    LOCAL_GDI_COUNTER(0, __FUNCTION__);
#if FLASH_WINDOW_REDRAW
    auto greenBrush = adoptGDIObject(::CreateSolidBrush(RGB(0, 255, 0)));
    RECT rect = dirtyRectPixels;
    FillRect(windowDC, &rect, greenBrush.get());
    GdiFlush();
    Sleep(50);
#endif

    // Blit the dirty rect from the backing store into the same position
    // in the destination DC.
    BitBlt(windowDC, dirtyRectPixels.x(), dirtyRectPixels.y(), dirtyRectPixels.width(), dirtyRectPixels.height(), bitmapDC,
        dirtyRectPixels.x(), dirtyRectPixels.y(), SRCCOPY);

    m_needsDisplay = false;
}

void WebView::frameRect(RECT* rect)
{
    ::GetWindowRect(m_viewWindow, rect);
}

void WebView::closeWindow()
{
    if (m_hasSpellCheckerDocumentTag) {
        if (m_editingDelegate)
            m_editingDelegate->closeSpellDocument(this);
        m_hasSpellCheckerDocumentTag = false;
    }

    COMPtr<IWebUIDelegate> ui;
    if (SUCCEEDED(uiDelegate(&ui)))
        ui->webViewClose(this);
}

bool WebView::canHandleRequest(const WebCore::ResourceRequest& request)
{
#if USE(CFURLCONNECTION)
    // On the Mac there's an about URL protocol implementation but Windows CFNetwork doesn't have that.
    if (request.url().protocolIs("about"_s))
        return true;

    return CFURLProtocolCanHandleRequest(request.cfURLRequest(UpdateHTTPBody));
#else
    return true;
#endif
}

String WebView::standardUserAgentWithApplicationName(const String& applicationName)
{
    static const NeverDestroyed<String> prefix = makeString("Mozilla/5.0 (", windowsVersionForUAString(), ") AppleWebKit/", webKitVersionString(), " (KHTML, like Gecko)");
    return makeString(prefix.get(), applicationName.isEmpty() ? "" : " ", applicationName);
}

Page* WebView::page()
{
    return m_page;
}

#if ENABLE(CONTEXT_MENUS)
static HMENU createContextMenuFromItems(const Vector<ContextMenuItem>& items)
{
    HMENU menu = ::CreatePopupMenu();

    for (auto& item : items) {
        UINT flags = 0;

        flags |= item.enabled() ? MF_ENABLED : MF_DISABLED;
        flags |= item.checked() ? MF_CHECKED : MF_UNCHECKED;

        switch (item.type()) {
        case ActionType:
        case CheckableActionType:
            ::AppendMenu(menu, flags | MF_STRING, item.action(), item.title().wideCharacters().data());
            break;
        case SeparatorType:
            ::AppendMenu(menu, flags | MF_SEPARATOR, item.action(), nullptr);
            break;
        case SubmenuType:
            ::AppendMenu(menu, flags | MF_POPUP, (UINT_PTR)createContextMenuFromItems(item.subMenuItems()), item.title().wideCharacters().data());
            break;
        }
    }

    return menu;
}

HMENU WebView::createContextMenu()
{
    auto& contextMenuController = m_page->contextMenuController();

    ContextMenu* coreMenu = contextMenuController.contextMenu();
    if (!coreMenu)
        return nullptr;

    HMENU contextMenu = createContextMenuFromItems(coreMenu->items());

    COMPtr<IWebUIDelegate> uiDelegate;
    if (SUCCEEDED(this->uiDelegate(&uiDelegate))) {
        ASSERT(uiDelegate);

        COMPtr<WebElementPropertyBag> propertyBag;
        propertyBag.adoptRef(WebElementPropertyBag::createInstance(contextMenuController.hitTestResult()));

        HMENU newMenu = nullptr;
        if (SUCCEEDED(uiDelegate->contextMenuItemsForElement(this, propertyBag.get(), contextMenu, &newMenu))) {
            // Make sure to delete the old menu if the delegate returned a new menu.
            if (newMenu != contextMenu) {
                ::DestroyMenu(contextMenu);
                contextMenu = newMenu;
            }
        }
    }

    return contextMenu;
}
#endif

bool WebView::handleContextMenuEvent(WPARAM wParam, LPARAM lParam)
{
#if ENABLE(CONTEXT_MENUS)
    // Translate the screen coordinates into window coordinates
    POINT coords = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
    if (coords.x == -1 || coords.y == -1) {
        // The contextMenuController() holds onto the last context menu that was popped up on the
        // page until a new one is created. We need to clear this menu before propagating the event
        // through the DOM so that we can detect if we create a new menu for this event, since we
        // won't create a new menu if the DOM swallows the event and the defaultEventHandler does
        // not run.
        m_page->contextMenuController().clearContextMenu();

        Frame& focusedFrame = m_page->focusController().focusedOrMainFrame();
        return focusedFrame.eventHandler().sendContextMenuEventForKey();

    } else {
        if (!::ScreenToClient(m_viewWindow, &coords))
            return false;
    }

    lParam = MAKELPARAM(coords.x, coords.y);

    // Convert coordinates to logical pixels
    float scaleFactor = deviceScaleFactor();
    float inverseScaleFactor = 1.0f / scaleFactor;
    IntPoint logicalCoords(coords);
    logicalCoords.scale(inverseScaleFactor, inverseScaleFactor);

    m_page->contextMenuController().clearContextMenu();

    IntPoint documentPoint(m_page->mainFrame().view()->windowToContents(logicalCoords));
    constexpr OptionSet<HitTestRequest::Type> hitType { HitTestRequest::Type::ReadOnly, HitTestRequest::Type::Active, HitTestRequest::Type::DisallowUserAgentShadowContent, HitTestRequest::Type::AllowChildFrameContent };
    HitTestResult result = m_page->mainFrame().eventHandler().hitTestResultAtPoint(documentPoint, hitType);
    Frame* targetFrame = result.innerNonSharedNode() ? result.innerNonSharedNode()->document().frame() : &m_page->focusController().focusedOrMainFrame();

    targetFrame->view()->setCursor(pointerCursor());
    PlatformMouseEvent mouseEvent(m_viewWindow, WM_RBUTTONUP, wParam, makeScaledPoint(IntPoint(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)), deviceScaleFactor()));
    bool handledEvent = targetFrame->eventHandler().sendContextMenuEvent(mouseEvent);
    if (!handledEvent)
        return false;

    ContextMenuController& contextMenuController = m_page->contextMenuController();

    // Show the menu
    ContextMenu* coreMenu = contextMenuController.contextMenu();
    if (!coreMenu)
        return false;

    Frame* frame = contextMenuController.hitTestResult().innerNodeFrame();
    if (!frame)
        return false;

    FrameView* view = frame->view();
    if (!view)
        return false;

    IntPoint logicalPoint = view->contentsToWindow(contextMenuController.hitTestResult().roundedPointInInnerNodeFrame());
    logicalPoint.scale(scaleFactor, scaleFactor);

    // Translate the point to screen coordinates
    POINT point = logicalPoint;
    if (!::ClientToScreen(m_viewWindow, &point))
        return false;

    if (m_currentContextMenu)
        ::DestroyMenu(m_currentContextMenu);
    m_currentContextMenu = createContextMenu();

    MENUINFO menuInfo;
    menuInfo.cbSize = sizeof(menuInfo);
    menuInfo.fMask = MIM_STYLE;
    menuInfo.dwStyle = MNS_NOTIFYBYPOS;
    ::SetMenuInfo(m_currentContextMenu, &menuInfo);

    BOOL hasCustomMenus = false;
    if (m_uiDelegate)
        m_uiDelegate->hasCustomMenuImplementation(&hasCustomMenus);

    if (hasCustomMenus)
        m_uiDelegate->trackCustomPopupMenu((IWebView*)this, m_currentContextMenu, &point);
    else {
        // Surprisingly, TPM_RIGHTBUTTON means that items are selectable with either the right OR left mouse button
        UINT flags = TPM_RIGHTBUTTON | TPM_TOPALIGN | TPM_VERPOSANIMATION | TPM_HORIZONTAL | TPM_LEFTALIGN | TPM_HORPOSANIMATION;
        ::TrackPopupMenuEx(m_currentContextMenu, flags, point.x, point.y, m_viewWindow, 0);
    }

    return true;
#else
    UNUSED_PARAM(wParam);
    UNUSED_PARAM(lParam);
    return false;
#endif
}

bool WebView::onMeasureItem(WPARAM /*wParam*/, LPARAM lParam)
{
    if (!m_uiDelegate)
        return false;

    BOOL hasCustomMenus = false;
    m_uiDelegate->hasCustomMenuImplementation(&hasCustomMenus);
    if (!hasCustomMenus)
        return false;

    m_uiDelegate->measureCustomMenuItem((IWebView*)this, (void*)lParam);
    return true;
}

bool WebView::onDrawItem(WPARAM /*wParam*/, LPARAM lParam)
{
    if (!m_uiDelegate)
        return false;

    BOOL hasCustomMenus = false;
    m_uiDelegate->hasCustomMenuImplementation(&hasCustomMenus);
    if (!hasCustomMenus)
        return false;

    m_uiDelegate->drawCustomMenuItem((IWebView*)this, (void*)lParam);
    return true;
}

bool WebView::onInitMenuPopup(WPARAM wParam, LPARAM /*lParam*/)
{
    if (!m_uiDelegate)
        return false;

    HMENU menu = (HMENU)wParam;
    if (!menu)
        return false;

    BOOL hasCustomMenus = false;
    m_uiDelegate->hasCustomMenuImplementation(&hasCustomMenus);
    if (!hasCustomMenus)
        return false;

    m_uiDelegate->addCustomMenuDrawingData((IWebView*)this, menu);
    return true;
}

bool WebView::onUninitMenuPopup(WPARAM wParam, LPARAM /*lParam*/)
{
    if (!m_uiDelegate)
        return false;

    HMENU menu = (HMENU)wParam;
    if (!menu)
        return false;

    BOOL hasCustomMenus = false;
    m_uiDelegate->hasCustomMenuImplementation(&hasCustomMenus);
    if (!hasCustomMenus)
        return false;

    m_uiDelegate->cleanUpCustomMenuDrawingData((IWebView*)this, menu);
    return true;
}

void WebView::onMenuCommand(WPARAM wParam, LPARAM lParam)
{
#if ENABLE(CONTEXT_MENUS)
    HMENU hMenu = reinterpret_cast<HMENU>(lParam);
    unsigned index = static_cast<unsigned>(wParam);

    MENUITEMINFO menuItemInfo { };
    menuItemInfo.cbSize = sizeof(menuItemInfo);
    menuItemInfo.fMask = MIIM_STRING;
    ::GetMenuItemInfo(hMenu, index, true, &menuItemInfo);

    Vector<WCHAR> buffer(menuItemInfo.cch + 1);
    menuItemInfo.dwTypeData = buffer.data();
    menuItemInfo.cch++;
    menuItemInfo.fMask |= MIIM_ID;

    ::GetMenuItemInfo(hMenu, index, true, &menuItemInfo);

    ::DestroyMenu(m_currentContextMenu);
    m_currentContextMenu = nullptr;

    String title(buffer.data(), menuItemInfo.cch);
    ContextMenuAction action = static_cast<ContextMenuAction>(menuItemInfo.wID);

    if (action >= ContextMenuItemBaseApplicationTag) {
        if (m_uiDelegate) {
            COMPtr<WebElementPropertyBag> propertyBag;
            propertyBag.adoptRef(WebElementPropertyBag::createInstance(m_page->contextMenuController().hitTestResult()));

            m_uiDelegate->contextMenuItemSelected(this, &menuItemInfo, propertyBag.get());
        }
        return;
    }

    m_page->contextMenuController().contextMenuItemSelected(action, title);
#else
    UNUSED_PARAM(wParam);
    UNUSED_PARAM(lParam);
#endif
}

bool WebView::handleMouseEvent(UINT message, WPARAM wParam, LPARAM lParam)
{
    static LONG globalClickCount;
    static IntPoint globalPrevPoint;
    static MouseButton globalPrevButton;
    static LONG globalPrevMouseDownTime;

    if (message == WM_CANCELMODE) {
        m_page->mainFrame().eventHandler().lostMouseCapture();
        return true;
    }

    // Create our event.
    // On WM_MOUSELEAVE we need to create a mouseout event, so we force the position
    // of the event to be at (MINSHORT, MINSHORT).
    LPARAM position = (message == WM_MOUSELEAVE) ? ((MINSHORT << 16) | MINSHORT) : makeScaledPoint(IntPoint(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)), deviceScaleFactor());
    PlatformMouseEvent mouseEvent(m_viewWindow, message, wParam, position, m_mouseActivated);

    setMouseActivated(false);

    bool insideThreshold = abs(globalPrevPoint.x() - mouseEvent.position().x()) < ::GetSystemMetrics(SM_CXDOUBLECLK) &&
                           abs(globalPrevPoint.y() - mouseEvent.position().y()) < ::GetSystemMetrics(SM_CYDOUBLECLK);
    LONG messageTime = ::GetMessageTime();

    bool handled = false;

    if (message == WM_LBUTTONDOWN || message == WM_MBUTTONDOWN || message == WM_RBUTTONDOWN) {
        // FIXME: I'm not sure if this is the "right" way to do this
        // but without this call, we never become focused since we don't allow
        // the default handling of mouse events.
        SetFocus(m_viewWindow);

        // Always start capturing events when the mouse goes down in our HWND.
        ::SetCapture(m_viewWindow);

        if ((messageTime - globalPrevMouseDownTime) < getDoubleClickTime()
            && insideThreshold
            && mouseEvent.button() == globalPrevButton)
            globalClickCount++;
        else
            // Reset the click count.
            globalClickCount = 1;
        globalPrevMouseDownTime = messageTime;
        globalPrevButton = mouseEvent.button();
        globalPrevPoint = mouseEvent.position();
        
        mouseEvent.setClickCount(globalClickCount);
        handled = m_page->mainFrame().eventHandler().handleMousePressEvent(mouseEvent);
    } else if (message == WM_LBUTTONDBLCLK || message == WM_MBUTTONDBLCLK || message == WM_RBUTTONDBLCLK) {
        globalClickCount++;
        mouseEvent.setClickCount(globalClickCount);
        handled = m_page->mainFrame().eventHandler().handleMousePressEvent(mouseEvent);
    } else if (message == WM_LBUTTONUP || message == WM_MBUTTONUP || message == WM_RBUTTONUP) {
        // Record the global position and the button of the up.
        globalPrevButton = mouseEvent.button();
        globalPrevPoint = mouseEvent.position();
        mouseEvent.setClickCount(globalClickCount);
        m_page->mainFrame().eventHandler().handleMouseReleaseEvent(mouseEvent);
        ::ReleaseCapture();
    } else if (message == WM_MOUSELEAVE && m_mouseOutTracker) {
        // Once WM_MOUSELEAVE is fired windows clears this tracker
        // so there is no need to disable it ourselves.
        m_mouseOutTracker.reset();
        m_page->mainFrame().eventHandler().mouseMoved(mouseEvent);
        handled = true;
    } else if (message == WM_MOUSEMOVE) {
        if (!insideThreshold)
            globalClickCount = 0;
        mouseEvent.setClickCount(globalClickCount);
        handled = m_page->mainFrame().eventHandler().mouseMoved(mouseEvent);
        if (!m_mouseOutTracker) {
            m_mouseOutTracker = makeUniqueWithoutFastMallocCheck<TRACKMOUSEEVENT>();
            m_mouseOutTracker->cbSize = sizeof(TRACKMOUSEEVENT);
            m_mouseOutTracker->dwFlags = TME_LEAVE;
            m_mouseOutTracker->hwndTrack = m_viewWindow;
            ::TrackMouseEvent(m_mouseOutTracker.get());
        }
    }
    return handled;
}

bool WebView::gestureNotify(WPARAM wParam, LPARAM lParam)
{
    GESTURENOTIFYSTRUCT* gn = reinterpret_cast<GESTURENOTIFYSTRUCT*>(lParam);

    Frame* coreFrame = core(m_mainFrame);
    if (!coreFrame)
        return false;

    ScrollView* view = coreFrame->view();
    if (!view)
        return false;

    // If we don't have this function, we shouldn't be receiving this message
    ASSERT(SetGestureConfigPtr());

    bool hitScrollbar = false;
    POINT gestureBeginPoint = {gn->ptsLocation.x, gn->ptsLocation.y};

    float scaleFactor = deviceScaleFactor();
    float inverseScaleFactor = 1.0f / scaleFactor;
    IntPoint logicalGestureBeginPoint(gestureBeginPoint);
    logicalGestureBeginPoint.scale(inverseScaleFactor, inverseScaleFactor);

    HitTestRequest request { OptionSet<HitTestRequest::Type> { HitTestRequest::Type::ReadOnly, HitTestRequest::Type::DisallowUserAgentShadowContent } };
    for (RefPtr<Frame> childFrame = &m_page->mainFrame(); childFrame; childFrame = EventHandler::subframeForTargetNode(m_gestureTargetNode.get())) {
        FrameView* frameView = childFrame->view();
        if (!frameView)
            break;
        RenderView* renderView = childFrame->document()->renderView();
        if (!renderView)
            break;
        RenderLayer* layer = renderView->layer();
        if (!layer)
            break;

        HitTestResult result(frameView->screenToContents(logicalGestureBeginPoint));
        layer->hitTest(request, result);
        m_gestureTargetNode = result.innerNode();

        if (!hitScrollbar)
            hitScrollbar = result.scrollbar();
    }

    if (!hitScrollbar) {
        // The hit testing above won't detect if we've hit the main frame's vertical scrollbar. Check that manually now.
        RECT webViewRect;
        GetWindowRect(m_viewWindow, &webViewRect);
        hitScrollbar = (view->verticalScrollbar() && (gestureBeginPoint.x > (webViewRect.right - view->verticalScrollbar()->theme().scrollbarThickness()))) 
            || (view->horizontalScrollbar() && (gestureBeginPoint.y > (webViewRect.bottom - view->horizontalScrollbar()->theme().scrollbarThickness())));  
    }

    bool canBeScrolled = false;
    if (m_gestureTargetNode) {
        for (RenderObject* renderer = m_gestureTargetNode->renderer(); renderer; renderer = renderer->parent()) {
            if (is<RenderBox>(*renderer) && downcast<RenderBox>(*renderer).canBeScrolledAndHasScrollableArea()) {
                canBeScrolled = true;
                break;
            }
        }
    } else {
        // We've hit the main document but not any of the document's content
        if (core(m_mainFrame)->view()->isScrollable())
            canBeScrolled = true;
    }

    // We always allow two-fingered panning with inertia and a gutter (which limits movement to one
    // direction in most cases).
    DWORD dwPanWant = GC_PAN | GC_PAN_WITH_INERTIA | GC_PAN_WITH_GUTTER;
    DWORD dwPanBlock = 0;

    if (hitScrollbar || !canBeScrolled) {
        // The part of the page under the gesture can't be scrolled, or the gesture is on a scrollbar.
        // Disallow single-fingered panning in this case so we'll fall back to the default
        // behavior (which allows the scrollbar thumb to be dragged, text selections to be made, etc.).
        dwPanBlock = GC_PAN_WITH_SINGLE_FINGER_VERTICALLY | GC_PAN_WITH_SINGLE_FINGER_HORIZONTALLY;
    } else {
        // The part of the page the gesture is under can be scrolled, and we're not under a scrollbar.
        // Allow single-fingered vertical panning in this case, so the user will be able to pan the page
        // with one or two fingers.
        dwPanWant |= GC_PAN_WITH_SINGLE_FINGER_VERTICALLY;

        // Disable single-fingered horizontal panning only if the target node is text.
        if (m_gestureTargetNode && m_gestureTargetNode->isTextNode())
            dwPanBlock = GC_PAN_WITH_SINGLE_FINGER_HORIZONTALLY;
        else
            dwPanWant |= GC_PAN_WITH_SINGLE_FINGER_HORIZONTALLY;
    }

    GESTURECONFIG gc = { GID_PAN, dwPanWant, dwPanBlock };
    return SetGestureConfigPtr()(m_viewWindow, 0, 1, &gc, sizeof(GESTURECONFIG));
}

bool WebView::gesture(WPARAM wParam, LPARAM lParam) 
{
    // We want to bail out if we don't have either of these functions
    if (!GetGestureInfoPtr() || !CloseGestureInfoHandlePtr())
        return false;

    HGESTUREINFO gestureHandle = reinterpret_cast<HGESTUREINFO>(lParam);
    
    GESTUREINFO gi { };
    gi.cbSize = sizeof(GESTUREINFO);

    if (!GetGestureInfoPtr()(gestureHandle, reinterpret_cast<PGESTUREINFO>(&gi)))
        return false;

    switch (gi.dwID) {
    case GID_BEGIN:
        m_lastPanX = gi.ptsLocation.x;
        m_lastPanY = gi.ptsLocation.y;

        break;
    case GID_END:
        m_gestureTargetNode = nullptr;
        break;
    case GID_PAN: {
        if (gi.dwFlags & GF_BEGIN) {
            m_lastPanX = gi.ptsLocation.x;
            m_lastPanY = gi.ptsLocation.y;
        }
        // Where are the fingers currently?
        long currentX = gi.ptsLocation.x;
        long currentY = gi.ptsLocation.y;
        // How far did we pan in each direction?
        long deltaX = currentX - m_lastPanX;
        long deltaY = currentY - m_lastPanY;
        // Calculate the overpan for window bounce
        m_yOverpan -= m_lastPanY - currentY;
        m_xOverpan -= m_lastPanX - currentX;
        // Update our class variables with updated values
        m_lastPanX = currentX;
        m_lastPanY = currentY;

        Frame* coreFrame = core(m_mainFrame);
        if (!coreFrame) {
            CloseGestureInfoHandlePtr()(gestureHandle);
            return false;
        }

        ScrollableArea* scrolledArea = 0;
        float scaleFactor = deviceScaleFactor();
        IntSize logicalScrollDelta(-deltaX * scaleFactor, -deltaY * scaleFactor);

        RenderLayer* scrollableArea = nullptr;
        if (m_gestureTargetNode && m_gestureTargetNode->renderer()) {
            if (auto* layer = m_gestureTargetNode->renderer()->enclosingLayer())
                scrollableArea = layer->enclosingScrollableLayer(IncludeSelfOrNot::ExcludeSelf, CrossFrameBoundaries::Yes);
        }

        if (!scrollableArea) {
            // We might directly hit the document without hitting any nodes
            coreFrame->view()->scrollBy(logicalScrollDelta);
            scrolledArea = coreFrame->view();
        } else
            scrollableArea->ensureLayerScrollableArea()->scrollByRecursively(logicalScrollDelta, &scrolledArea);

        if (!(UpdatePanningFeedbackPtr() && BeginPanningFeedbackPtr() && EndPanningFeedbackPtr())) {
            CloseGestureInfoHandlePtr()(gestureHandle);
            return true;
        }

        // Handle overpanning
        if (gi.dwFlags & GF_BEGIN) {
            BeginPanningFeedbackPtr()(m_viewWindow);
            m_yOverpan = 0;
            m_xOverpan = 0;
        } else if (gi.dwFlags & GF_END) {
            EndPanningFeedbackPtr()(m_viewWindow, true);
            m_yOverpan = 0;
            m_xOverpan = 0;
        }

        if (!scrolledArea) {
            CloseGestureInfoHandlePtr()(gestureHandle);
            return true;
        }

        Scrollbar* vertScrollbar = scrolledArea->verticalScrollbar();

        int ypan = 0;
        int xpan = 0;

        if (vertScrollbar && (!vertScrollbar->currentPos() || vertScrollbar->currentPos() >= vertScrollbar->maximum()))
            ypan = m_yOverpan;

        Scrollbar* horiScrollbar = scrolledArea->horizontalScrollbar();

        if (horiScrollbar && (!horiScrollbar->currentPos() || horiScrollbar->currentPos() >= horiScrollbar->maximum()))
            xpan = m_xOverpan;

        UpdatePanningFeedbackPtr()(m_viewWindow, xpan, ypan, gi.dwFlags & GF_INERTIA);

        CloseGestureInfoHandlePtr()(gestureHandle);
        return true;
    }
    default:
        break;
    }

    // If we get to this point, the gesture has not been handled. We forward
    // the call to DefWindowProc by returning false, and we don't need to 
    // to call CloseGestureInfoHandle. 
    // http://msdn.microsoft.com/en-us/library/dd353228(VS.85).aspx
    return false;
}

bool WebView::mouseWheel(WPARAM wParam, LPARAM lParam, bool isMouseHWheel)
{
    // Ctrl+Mouse wheel doesn't ever go into WebCore.  It is used to
    // zoom instead (Mac zooms the whole Desktop, but Windows browsers trigger their
    // own local zoom modes for Ctrl+wheel).
    if (wParam & MK_CONTROL) {
        short delta = short(HIWORD(wParam));
        if (delta < 0)
            makeTextSmaller(0);
        else
            makeTextLarger(0);
        return true;
    }
    
    // FIXME: This doesn't fix https://bugs.webkit.org/show_bug.cgi?id=28217. This only fixes https://bugs.webkit.org/show_bug.cgi?id=28203.
    HWND focusedWindow = GetFocus();
    if (focusedWindow && focusedWindow != m_viewWindow) {
        // Our focus is on a different hwnd, see if it's a PopupMenu and if so, set the focus back on us (which will hide the popup).
        WCHAR className[256];

        // Make sure truncation won't affect the comparison.
        ASSERT(WTF_ARRAY_LENGTH(className) > wcslen(PopupMenuWin::popupClassName()));

        if (GetClassNameW(focusedWindow, className, WTF_ARRAY_LENGTH(className)) && !wcscmp(className, PopupMenuWin::popupClassName())) {
            // We don't let the WebView scroll here for two reasons - 1) To match Firefox behavior, 2) If we do scroll, we lose the
            // focus ring around the select menu.
            SetFocus(m_viewWindow);
            return true;
        }
    }

    PlatformWheelEvent wheelEvent(m_viewWindow, wParam, lParam, isMouseHWheel);
    Frame* coreFrame = core(m_mainFrame);
    if (!coreFrame)
        return false;

    return coreFrame->eventHandler().handleWheelEvent(wheelEvent, { WheelEventProcessingSteps::MainThreadForScrolling, WheelEventProcessingSteps::MainThreadForBlockingDOMEventDispatch });
}

bool WebView::verticalScroll(WPARAM wParam, LPARAM /*lParam*/)
{
    ScrollDirection direction;
    ScrollGranularity granularity;
    switch (LOWORD(wParam)) {
    case SB_LINEDOWN:
        granularity = ScrollGranularity::Line;
        direction = ScrollDown;
        break;
    case SB_LINEUP:
        granularity = ScrollGranularity::Line;
        direction = ScrollUp;
        break;
    case SB_PAGEDOWN:
        granularity = ScrollGranularity::Document;
        direction = ScrollDown;
        break;
    case SB_PAGEUP:
        granularity = ScrollGranularity::Document;
        direction = ScrollUp;
        break;
    default:
        return false;
        break;
    }
    
    Frame& frame = m_page->focusController().focusedOrMainFrame();
    return frame.eventHandler().scrollRecursively(direction, granularity);
}

bool WebView::horizontalScroll(WPARAM wParam, LPARAM /*lParam*/)
{
    ScrollDirection direction;
    ScrollGranularity granularity;
    switch (LOWORD(wParam)) {
    case SB_LINELEFT:
        granularity = ScrollGranularity::Line;
        direction = ScrollLeft;
        break;
    case SB_LINERIGHT:
        granularity = ScrollGranularity::Line;
        direction = ScrollRight;
        break;
    case SB_PAGELEFT:
        granularity = ScrollGranularity::Document;
        direction = ScrollLeft;
        break;
    case SB_PAGERIGHT:
        granularity = ScrollGranularity::Document;
        direction = ScrollRight;
        break;
    default:
        return false;
    }

    Frame& frame = m_page->focusController().focusedOrMainFrame();
    return frame.eventHandler().scrollRecursively(direction, granularity);
}


bool WebView::execCommand(WPARAM wParam, LPARAM /*lParam*/)
{
    Frame& frame = m_page->focusController().focusedOrMainFrame();
    switch (LOWORD(wParam)) {
        case SelectAll:
            return frame.editor().command("SelectAll"_s).execute();
        case Undo:
            return frame.editor().command("Undo"_s).execute();
        case Redo:
            return frame.editor().command("Redo"_s).execute();
    }
    return false;
}

bool WebView::keyUp(WPARAM virtualKeyCode, LPARAM keyData, bool systemKeyDown)
{
    PlatformKeyboardEvent keyEvent(m_viewWindow, virtualKeyCode, keyData, PlatformEvent::KeyUp, systemKeyDown);

    Frame& frame = m_page->focusController().focusedOrMainFrame();
    m_currentCharacterCode = 0;

    return frame.eventHandler().keyEvent(keyEvent);
}

static const unsigned CtrlKey = 1 << 0;
static const unsigned AltKey = 1 << 1;
static const unsigned ShiftKey = 1 << 2;


struct KeyDownEntry {
    unsigned virtualKey;
    unsigned modifiers;
    const char* name;
};

struct KeyPressEntry {
    unsigned charCode;
    unsigned modifiers;
    const char* name;
};

static const KeyDownEntry keyDownEntries[] = {
    { VK_LEFT,   0,                  "MoveLeft"                                    },
    { VK_LEFT,   ShiftKey,           "MoveLeftAndModifySelection"                  },
    { VK_LEFT,   CtrlKey,            "MoveWordLeft"                                },
    { VK_LEFT,   CtrlKey | ShiftKey, "MoveWordLeftAndModifySelection"              },
    { VK_RIGHT,  0,                  "MoveRight"                                   },
    { VK_RIGHT,  ShiftKey,           "MoveRightAndModifySelection"                 },
    { VK_RIGHT,  CtrlKey,            "MoveWordRight"                               },
    { VK_RIGHT,  CtrlKey | ShiftKey, "MoveWordRightAndModifySelection"             },
    { VK_UP,     0,                  "MoveUp"                                      },
    { VK_UP,     ShiftKey,           "MoveUpAndModifySelection"                    },
    { VK_PRIOR,  ShiftKey,           "MovePageUpAndModifySelection"                },
    { VK_DOWN,   0,                  "MoveDown"                                    },
    { VK_DOWN,   ShiftKey,           "MoveDownAndModifySelection"                  },
    { VK_NEXT,   ShiftKey,           "MovePageDownAndModifySelection"              },
    { VK_PRIOR,  0,                  "MovePageUp"                                  },
    { VK_NEXT,   0,                  "MovePageDown"                                },
    { VK_HOME,   0,                  "MoveToBeginningOfLine"                       },
    { VK_HOME,   ShiftKey,           "MoveToBeginningOfLineAndModifySelection"     },
    { VK_HOME,   CtrlKey,            "MoveToBeginningOfDocument"                   },
    { VK_HOME,   CtrlKey | ShiftKey, "MoveToBeginningOfDocumentAndModifySelection" },

    { VK_END,    0,                  "MoveToEndOfLine"                             },
    { VK_END,    ShiftKey,           "MoveToEndOfLineAndModifySelection"           },
    { VK_END,    CtrlKey,            "MoveToEndOfDocument"                         },
    { VK_END,    CtrlKey | ShiftKey, "MoveToEndOfDocumentAndModifySelection"       },

    { VK_BACK,   0,                  "DeleteBackward"                              },
    { VK_BACK,   ShiftKey,           "DeleteBackward"                              },
    { VK_DELETE, 0,                  "DeleteForward"                               },
    { VK_BACK,   CtrlKey,            "DeleteWordBackward"                          },
    { VK_DELETE, CtrlKey,            "DeleteWordForward"                           },
    
    { 'B',       CtrlKey,            "ToggleBold"                                  },
    { 'I',       CtrlKey,            "ToggleItalic"                                },

    { VK_ESCAPE, 0,                  "Cancel"                                      },
    { VK_OEM_PERIOD, CtrlKey,        "Cancel"                                      },
    { VK_TAB,    0,                  "InsertTab"                                   },
    { VK_TAB,    ShiftKey,           "InsertBacktab"                               },
    { VK_RETURN, 0,                  "InsertNewline"                               },
    { VK_RETURN, CtrlKey,            "InsertNewline"                               },
    { VK_RETURN, AltKey,             "InsertNewline"                               },
    { VK_RETURN, ShiftKey,           "InsertNewline"                               },
    { VK_RETURN, AltKey | ShiftKey,  "InsertNewline"                               },

    // It's not quite clear whether clipboard shortcuts and Undo/Redo should be handled
    // in the application or in WebKit. We chose WebKit.
    { 'C',       CtrlKey,            "Copy"                                        },
    { 'V',       CtrlKey,            "Paste"                                       },
    { 'X',       CtrlKey,            "Cut"                                         },
    { 'A',       CtrlKey,            "SelectAll"                                   },
    { VK_INSERT, CtrlKey,            "Copy"                                        },
    { VK_DELETE, ShiftKey,           "Cut"                                         },
    { VK_INSERT, ShiftKey,           "Paste"                                       },
    { 'Z',       CtrlKey,            "Undo"                                        },
    { 'Z',       CtrlKey | ShiftKey, "Redo"                                        },
};

static const KeyPressEntry keyPressEntries[] = {
    { '\t',   0,                  "InsertTab"                                   },
    { '\t',   ShiftKey,           "InsertBacktab"                               },
    { '\r',   0,                  "InsertNewline"                               },
    { '\r',   CtrlKey,            "InsertNewline"                               },
    { '\r',   AltKey,             "InsertNewline"                               },
    { '\r',   ShiftKey,           "InsertNewline"                               },
    { '\r',   AltKey | ShiftKey,  "InsertNewline"                               },
};

const char* WebView::interpretKeyEvent(const KeyboardEvent* evt)
{
    ASSERT(evt->type() == eventNames().keydownEvent || evt->type() == eventNames().keypressEvent);

    static HashMap<int, const char*>* keyDownCommandsMap = 0;
    static HashMap<int, const char*>* keyPressCommandsMap = 0;

    if (!keyDownCommandsMap) {
        keyDownCommandsMap = new HashMap<int, const char*>;
        keyPressCommandsMap = new HashMap<int, const char*>;

        for (size_t i = 0; i < WTF_ARRAY_LENGTH(keyDownEntries); ++i)
            keyDownCommandsMap->set(keyDownEntries[i].modifiers << 16 | keyDownEntries[i].virtualKey, keyDownEntries[i].name);

        for (size_t i = 0; i < WTF_ARRAY_LENGTH(keyPressEntries); ++i)
            keyPressCommandsMap->set(keyPressEntries[i].modifiers << 16 | keyPressEntries[i].charCode, keyPressEntries[i].name);
    }

    unsigned modifiers = 0;
    if (evt->shiftKey())
        modifiers |= ShiftKey;
    if (evt->altKey())
        modifiers |= AltKey;
    if (evt->ctrlKey())
        modifiers |= CtrlKey;

    if (evt->type() == eventNames().keydownEvent) {
        int mapKey = modifiers << 16 | evt->keyCode();
        return mapKey ? keyDownCommandsMap->get(mapKey) : 0;
    }

    int mapKey = modifiers << 16 | evt->charCode();
    return mapKey ? keyPressCommandsMap->get(mapKey) : 0;
}

bool WebView::handleEditingKeyboardEvent(KeyboardEvent& event)
{
    auto* frame = downcast<Node>(event.target())->document().frame();
    ASSERT(frame);

    auto* keyEvent = event.underlyingPlatformEvent();
    if (!keyEvent || keyEvent->isSystemKey())  // do not treat this as text input if it's a system key event
        return false;

    if (event.type() != eventNames().keydownEvent && event.type() != eventNames().keypressEvent)
        return false;

    auto command = frame->editor().command(String::fromLatin1(interpretKeyEvent(&event)));

    if (keyEvent->type() == PlatformEvent::RawKeyDown) {
        // WebKit doesn't have enough information about mode to decide how commands that just insert text if executed via Editor should be treated,
        // so we leave it upon WebCore to either handle them immediately (e.g. Tab that changes focus) or let a keypress event be generated
        // (e.g. Tab that inserts a Tab character, or Enter).
        return !command.isTextInsertion() && command.execute(&event);
    }

    if (command.execute(&event))
        return true;

    // Don't insert null or control characters as they can result in unexpected behaviour
    if (event.charCode() < ' ')
        return false;

    return frame->editor().insertText(keyEvent->text(), &event);
}

bool WebView::keyDown(WPARAM virtualKeyCode, LPARAM keyData, bool systemKeyDown)
{
#if ENABLE(FULLSCREEN_API)
    // Trap the ESC key when in full screen mode.
    if (virtualKeyCode == VK_ESCAPE && isFullScreen()) {
        m_fullscreenController->exitFullScreen();
        return false;
    }
#endif
    Frame& frame = m_page->focusController().focusedOrMainFrame();

    Vector<MSG> pendingCharEvents;
    MSG msg;
    while (PeekMessage(&msg, m_viewWindow, WM_CHAR, WM_DEADCHAR, PM_REMOVE)) {
        // FIXME: remove WM_UNICHAR, too
        // WM_SYSCHAR events should not be removed, because WebKit is using WM_SYSCHAR for access keys and they can't be canceled.
        if (msg.message == WM_CHAR)
            pendingCharEvents.append(msg);
    }

    PlatformKeyboardEvent keyEvent(m_viewWindow, virtualKeyCode, keyData, PlatformEvent::RawKeyDown, systemKeyDown);
    bool handled = frame.eventHandler().keyEvent(keyEvent);

    // These events cannot be canceled, and we have no default handling for them.
    // FIXME: match IE list more closely, see <http://msdn2.microsoft.com/en-us/library/ms536938.aspx>.
    if (systemKeyDown && virtualKeyCode != VK_RETURN)
        return false;

    if (handled)
        return true;

    // We need to handle back/forward using either Ctrl+Left/Right Arrow keys.
    // FIXME: This logic should probably be in EventHandler::defaultArrowEventHandler().
    // FIXME: Should check that other modifiers aren't pressed.
    if (virtualKeyCode == VK_RIGHT && keyEvent.controlKey())
        return m_page->backForward().goForward();
    if (virtualKeyCode == VK_LEFT && keyEvent.controlKey())
        return m_page->backForward().goBack();

    // Need to scroll the page if the arrow keys, pgup/dn, or home/end are hit.
    bool willScroll = true;
    ScrollDirection direction { };
    ScrollGranularity granularity { };
    switch (virtualKeyCode) {
        case VK_LEFT:
            granularity = ScrollGranularity::Line;
            direction = ScrollLeft;
            break;
        case VK_RIGHT:
            granularity = ScrollGranularity::Line;
            direction = ScrollRight;
            break;
        case VK_UP:
            granularity = ScrollGranularity::Line;
            direction = ScrollUp;
            break;
        case VK_DOWN:
            granularity = ScrollGranularity::Line;
            direction = ScrollDown;
            break;
        case VK_HOME:
            granularity = ScrollGranularity::Document;
            direction = ScrollUp;
            break;
        case VK_END:
            granularity = ScrollGranularity::Document;
            direction = ScrollDown;
            break;
        case VK_PRIOR:
            granularity = ScrollGranularity::Page;
            direction = ScrollUp;
            break;
        case VK_NEXT:
            granularity = ScrollGranularity::Page;
            direction = ScrollDown;
            break;
        default:
            willScroll = false;
            break;
    }

    if (willScroll) {
        handled = frame.eventHandler().scrollRecursively(direction, granularity);
        if (handled)
            return true;
    }

    for (auto& msg : pendingCharEvents)
        DispatchMessage(&msg);
    return false;
}

bool WebView::keyPress(WPARAM charCode, LPARAM keyData, bool systemKeyDown)
{
    Frame& frame = m_page->focusController().focusedOrMainFrame();

    PlatformKeyboardEvent keyEvent(m_viewWindow, charCode, keyData, PlatformEvent::Char, systemKeyDown);
    // IE does not dispatch keypress event for WM_SYSCHAR.
    if (systemKeyDown)
        return frame.eventHandler().handleAccessKey(keyEvent);
    return frame.eventHandler().keyEvent(keyEvent);
}

void WebView::setIsBeingDestroyed()
{
    m_isBeingDestroyed = true;

    // Remove our this pointer from the window so we won't try to handle any more window messages.
    // See <http://webkit.org/b/55054>.
    ::SetWindowLongPtrW(m_viewWindow, 0, 0);
}

void WebView::setShouldInvertColors(bool shouldInvertColors)
{
    if (m_shouldInvertColors == shouldInvertColors)
        return;

    m_shouldInvertColors = shouldInvertColors;

#if USE(CA)
    if (m_layerTreeHost)
        m_layerTreeHost->setShouldInvertColors(shouldInvertColors);
#endif

    RECT windowRect { };
    frameRect(&windowRect);

    // repaint expects logical pixels, so rescale here.
    IntRect logicalRect(windowRect);
    logicalRect.scale(1.0f / deviceScaleFactor());
    repaint(logicalRect, true, true);
}

bool WebView::registerWebViewWindowClass()
{
    static bool haveRegisteredWindowClass = false;
    if (haveRegisteredWindowClass)
        return true;

    haveRegisteredWindowClass = true;

    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style          = CS_DBLCLKS;
    wcex.lpfnWndProc    = WebViewWndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = sizeof(WebView*);
    wcex.hInstance      = gInstance;
    wcex.hIcon          = 0;
    wcex.hCursor        = ::LoadCursor(0, IDC_ARROW);
    wcex.hbrBackground  = 0;
    wcex.lpszMenuName   = 0;
    wcex.lpszClassName  = kWebViewWindowClassName;
    wcex.hIconSm        = 0;

    return !!RegisterClassEx(&wcex);
}

static HWND findTopLevelParent(HWND window)
{
    if (!window)
        return 0;

    HWND current = window;
    for (HWND parent = GetParent(current); current; current = parent, parent = GetParent(parent))
        if (!parent || !(GetWindowLongPtr(current, GWL_STYLE) & (WS_POPUP | WS_CHILD)))
            return current;
    ASSERT_NOT_REACHED();
    return 0;
}

LRESULT CALLBACK WebView::WebViewWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    LRESULT lResult = 0;
    LONG_PTR longPtr = GetWindowLongPtr(hWnd, 0);
    WebView* webView = reinterpret_cast<WebView*>(longPtr);
    WebFrame* mainFrameImpl = webView ? webView->topLevelFrame() : 0;
    if (!mainFrameImpl)
        return DefWindowProc(hWnd, message, wParam, lParam);

    // We shouldn't be trying to handle any window messages after WM_DESTROY.
    // See <http://webkit.org/b/55054>.
    ASSERT(!webView->isBeingDestroyed());

    // hold a ref, since the WebView could go away in an event handler.
    COMPtr<WebView> protector(webView);
    ASSERT(webView);

    bool handled = true;

    switch (message) {
        case WM_PAINT: {
            webView->paint(0, 0);
            if (webView->usesLayeredWindow())
                webView->performLayeredWindowUpdate();
            break;
        }
        case WM_ERASEBKGND:
            // Don't perform a background erase.
            handled = true;
            lResult = 1;
            break;
        case WM_PRINTCLIENT:
            webView->paint((HDC)wParam, lParam);
            break;
        case WM_DESTROY:
            webView->setIsBeingDestroyed();
            webView->close();
            break;
        case WM_GESTURENOTIFY:
            handled = webView->gestureNotify(wParam, lParam);
            break;
        case WM_GESTURE:
            handled = webView->gesture(wParam, lParam);
            break;
        case WM_MOUSEMOVE:
        case WM_LBUTTONDOWN:
        case WM_MBUTTONDOWN:
        case WM_RBUTTONDOWN:
        case WM_LBUTTONDBLCLK:
        case WM_MBUTTONDBLCLK:
        case WM_RBUTTONDBLCLK:
        case WM_LBUTTONUP:
        case WM_MBUTTONUP:
        case WM_RBUTTONUP:
        case WM_MOUSELEAVE:
        case WM_CANCELMODE:
            if (Frame* coreFrame = core(mainFrameImpl))
                if (coreFrame->view()->didFirstLayout())
                    handled = webView->handleMouseEvent(message, wParam, lParam);
            break;
        case WM_MOUSEWHEEL:
        case WM_VISTA_MOUSEHWHEEL:
            if (Frame* coreFrame = core(mainFrameImpl))
                if (coreFrame->view()->didFirstLayout())
                    handled = webView->mouseWheel(wParam, lParam, message == WM_VISTA_MOUSEHWHEEL);
            break;
        case WM_SYSKEYDOWN:
            handled = webView->keyDown(wParam, lParam, true);
            break;
        case WM_KEYDOWN:
            handled = webView->keyDown(wParam, lParam);
            break;
        case WM_SYSKEYUP:
            handled = webView->keyUp(wParam, lParam, true);
            break;
        case WM_KEYUP:
            handled = webView->keyUp(wParam, lParam);
            break;
        case WM_SYSCHAR:
            handled = webView->keyPress(wParam, lParam, true);
            break;
        case WM_CHAR:
            handled = webView->keyPress(wParam, lParam);
            break;
        // FIXME: We need to check WM_UNICHAR to support supplementary characters (that don't fit in 16 bits).
        case WM_SIZE:
            if (lParam != 0)
                webView->sizeChanged(IntSize(LOWORD(lParam), HIWORD(lParam)));
            break;
        case WM_DPICHANGED:
            webView->dpiChanged(LOWORD(wParam), IntSize(LOWORD(lParam), HIWORD(lParam)));
            break;
        case WM_SHOWWINDOW:
            lResult = DefWindowProc(hWnd, message, wParam, lParam);
            if (wParam == 0) {
                // The window is being hidden (e.g., because we switched tabs).
                // Null out our backing store.
                webView->deleteBackingStore();
            }
            break;
        case WM_SETFOCUS: {
            COMPtr<IWebUIDelegate> uiDelegate;
            COMPtr<IWebUIDelegatePrivate> uiDelegatePrivate;
            if (SUCCEEDED(webView->uiDelegate(&uiDelegate)) && uiDelegate
                && SUCCEEDED(uiDelegate->QueryInterface(IID_IWebUIDelegatePrivate, (void**) &uiDelegatePrivate)) && uiDelegatePrivate)
                uiDelegatePrivate->webViewReceivedFocus(webView);

            FocusController& focusController = webView->page()->focusController();
            if (Frame* frame = focusController.focusedFrame()) {
                // Send focus events unless the previously focused window is a
                // child of ours (for example a plugin).
                if (!IsChild(hWnd, reinterpret_cast<HWND>(wParam)))
                    focusController.setFocused(true);
            } else
                focusController.setFocused(true);
            break;
        }
        case WM_KILLFOCUS: {
            COMPtr<IWebUIDelegate> uiDelegate;
            COMPtr<IWebUIDelegatePrivate> uiDelegatePrivate;
            HWND newFocusWnd = reinterpret_cast<HWND>(wParam);
            if (SUCCEEDED(webView->uiDelegate(&uiDelegate)) && uiDelegate
                && SUCCEEDED(uiDelegate->QueryInterface(IID_IWebUIDelegatePrivate, (void**) &uiDelegatePrivate)) && uiDelegatePrivate)
                uiDelegatePrivate->webViewLostFocus(webView, newFocusWnd);

            FocusController& focusController = webView->page()->focusController();
            Frame& frame = focusController.focusedOrMainFrame();
            webView->resetIME(&frame);
            // Send blur events unless we're losing focus to a child of ours.
            if (!IsChild(hWnd, newFocusWnd))
                focusController.setFocused(false);

            // If we are pan-scrolling when we lose focus, stop the pan scrolling.
            frame.eventHandler().stopAutoscrollTimer();

            break;
        }
        case WM_WINDOWPOSCHANGED:
            if (reinterpret_cast<WINDOWPOS*>(lParam)->flags & SWP_SHOWWINDOW)
                webView->updateActiveStateSoon();
            handled = false;
            break;
        case WM_CUT:
            webView->cut(0);
            break;
        case WM_COPY:
            webView->copy(0);
            break;
        case WM_PASTE:
            webView->paste(0);
            break;
        case WM_CLEAR:
            webView->delete_(0);
            break;
        case WM_COMMAND:
            if (HIWORD(wParam))
                handled = webView->execCommand(wParam, lParam);
            break;
        case WM_MENUCOMMAND:
            webView->onMenuCommand(wParam, lParam);
            break;
        case WM_CONTEXTMENU:
            handled = webView->handleContextMenuEvent(wParam, lParam);
            break;
        case WM_INITMENUPOPUP:
            handled = webView->onInitMenuPopup(wParam, lParam);
            break;
        case WM_MEASUREITEM:
            handled = webView->onMeasureItem(wParam, lParam);
            break;
        case WM_DRAWITEM:
            handled = webView->onDrawItem(wParam, lParam);
            break;
        case WM_UNINITMENUPOPUP:
            handled = webView->onUninitMenuPopup(wParam, lParam);
            break;
        case WM_XP_THEMECHANGED:
            if (Frame* coreFrame = core(mainFrameImpl)) {
                webView->deleteBackingStore();
                RenderTheme::singleton().themeChanged();
                ScrollbarTheme::theme().themeChanged();
                RECT windowRect;
                ::GetClientRect(hWnd, &windowRect);
                ::InvalidateRect(hWnd, &windowRect, false);
#if USE(CA)
                if (webView->isAcceleratedCompositing())
                    webView->m_backingLayer->setNeedsDisplay();
#endif
           }
            break;
        case WM_MOUSEACTIVATE:
            webView->setMouseActivated(true);
            handled = false;
            break;
        case WM_GETDLGCODE: {
            COMPtr<IWebUIDelegate> uiDelegate;
            COMPtr<IWebUIDelegatePrivate> uiDelegatePrivate;
            LONG_PTR dlgCode = 0;
            UINT keyCode = 0;
            if (lParam) {
                LPMSG lpMsg = (LPMSG)lParam;
                if (lpMsg->message == WM_KEYDOWN)
                    keyCode = (UINT) lpMsg->wParam;
            }
            if (SUCCEEDED(webView->uiDelegate(&uiDelegate)) && uiDelegate
                && SUCCEEDED(uiDelegate->QueryInterface(IID_IWebUIDelegatePrivate, (void**) &uiDelegatePrivate)) && uiDelegatePrivate
                && SUCCEEDED(uiDelegatePrivate->webViewGetDlgCode(webView, keyCode, &dlgCode)))
                return dlgCode;
            handled = false;
            break;
        }
        case WM_GETOBJECT:
            handled = webView->onGetObject(wParam, lParam, lResult);
            break;
        case WM_IME_STARTCOMPOSITION:
            handled = webView->onIMEStartComposition();
            break;
        case WM_IME_REQUEST:
            lResult = webView->onIMERequest(wParam, lParam);
            break;
        case WM_IME_COMPOSITION:
            handled = webView->onIMEComposition(lParam);
            break;
        case WM_IME_ENDCOMPOSITION:
            handled = webView->onIMEEndComposition();
            break;
        case WM_IME_CHAR:
            handled = webView->onIMEChar(wParam, lParam);
            break;
        case WM_IME_NOTIFY:
            handled = webView->onIMENotify(wParam, lParam, &lResult);
            break;
        case WM_IME_SELECT:
            handled = webView->onIMESelect(wParam, lParam);
            break;
        case WM_IME_SETCONTEXT:
            handled = webView->onIMESetContext(wParam, lParam);
            break;
        case WM_TIMER:
            switch (wParam) {
                case UpdateActiveStateTimer:
                    KillTimer(hWnd, UpdateActiveStateTimer);
                    webView->updateActiveState();
                    break;
                case DeleteBackingStoreTimer:
                    webView->deleteBackingStore();
                    break;
            }
            break;
        case WM_SETCURSOR:
            handled = ::SetCursor(webView->m_lastSetCursor);
            break;
        case WM_VSCROLL:
            handled = webView->verticalScroll(wParam, lParam);
            break;
        case WM_HSCROLL:
            handled = webView->horizontalScroll(wParam, lParam);
            break;
        default:
            handled = false;
            break;
    }

    webView->updateWindowIfNeeded(hWnd, message);

    if (!handled)
        lResult = DefWindowProc(hWnd, message, wParam, lParam);
    
    // Let the client know whether we consider this message handled.
    return (message == WM_KEYDOWN || message == WM_SYSKEYDOWN || message == WM_KEYUP || message == WM_SYSKEYUP) ? !handled : lResult;
}

void WebView::updateWindowIfNeeded(HWND hWnd, UINT message)
{
    if (!needsDisplay())
        return;

    // Care should be taken when updating the window from the window procedure.
    // Updating the window in response to e.g. WM_PARENTNOTIFY may cause reentrancy problems,
    // because WM_PARENTNOTIFY is sent synchronously to the parent window when e.g. DestroyWindow() is called.

    switch (message) {
    case WM_PAINT:
    case WM_PARENTNOTIFY:
        return;
    }

    ::UpdateWindow(hWnd);
}

bool WebView::developerExtrasEnabled() const
{
    if (m_preferences->developerExtrasDisabledByOverride())
        return false;

#ifdef NDEBUG
    BOOL enabled;
    return SUCCEEDED(m_preferences->developerExtrasEnabled(&enabled)) && enabled;
#else
    return true;
#endif
}

static String webKitVersionString()
{
#if !USE(CAIRO)
    LPWSTR buildNumberStringPtr;
    if (::LoadStringW(gInstance, BUILD_NUMBER, reinterpret_cast<LPWSTR>(&buildNumberStringPtr), 0) && buildNumberStringPtr)
        return buildNumberStringPtr;
#endif
    return makeString(WEBKIT_MAJOR_VERSION, '.', WEBKIT_MINOR_VERSION);
}

const String& WebView::userAgentForKURL(const URL&)
{
    if (m_userAgentOverridden)
        return m_userAgentCustom;

    if (!m_userAgentStandard.length())
        m_userAgentStandard = WebView::standardUserAgentWithApplicationName(m_applicationName);
    return m_userAgentStandard;
}

// IUnknown -------------------------------------------------------------------

HRESULT WebView::QueryInterface(_In_ REFIID riid, _COM_Outptr_ void** ppvObject)
{
    if (!ppvObject)
        return E_POINTER;
    *ppvObject = nullptr;
    if (IsEqualGUID(riid, CLSID_WebView))
        *ppvObject = this;
    else if (IsEqualGUID(riid, IID_IUnknown))
        *ppvObject = static_cast<IWebView*>(this);
    else if (IsEqualGUID(riid, IID_IWebView))
        *ppvObject = static_cast<IWebView*>(this);
    else if (IsEqualGUID(riid, IID_IWebViewPrivate))
        *ppvObject = static_cast<IWebViewPrivate*>(this);
    else if (IsEqualGUID(riid, IID_IWebViewPrivate2))
        *ppvObject = static_cast<IWebViewPrivate2*>(this);
    else if (IsEqualGUID(riid, IID_IWebViewPrivate3))
        *ppvObject = static_cast<IWebViewPrivate3*>(this);
    else if (IsEqualGUID(riid, IID_IWebViewPrivate4))
        *ppvObject = static_cast<IWebViewPrivate4*>(this);
    else if (IsEqualGUID(riid, IID_IWebViewPrivate5))
        *ppvObject = static_cast<IWebViewPrivate5*>(this);
    else if (IsEqualGUID(riid, IID_IWebIBActions))
        *ppvObject = static_cast<IWebIBActions*>(this);
    else if (IsEqualGUID(riid, IID_IWebViewCSS))
        *ppvObject = static_cast<IWebViewCSS*>(this);
    else if (IsEqualGUID(riid, IID_IWebViewEditing))
        *ppvObject = static_cast<IWebViewEditing*>(this);
    else if (IsEqualGUID(riid, IID_IWebViewUndoableEditing))
        *ppvObject = static_cast<IWebViewUndoableEditing*>(this);
    else if (IsEqualGUID(riid, IID_IWebViewEditingActions))
        *ppvObject = static_cast<IWebViewEditingActions*>(this);
    else if (IsEqualGUID(riid, IID_IWebNotificationObserver))
        *ppvObject = static_cast<IWebNotificationObserver*>(this);
    else if (IsEqualGUID(riid, IID_IDropTarget))
        *ppvObject = static_cast<IDropTarget*>(this);
    else
        return E_NOINTERFACE;

    AddRef();
    return S_OK;
}

ULONG WebView::AddRef()
{
    ASSERT(!m_deletionHasBegun);
    return ++m_refCount;
}

ULONG WebView::Release()
{
    ASSERT(!m_deletionHasBegun);

    if (m_refCount == 1) {
        // Call close() now so that clients don't have to. (It's harmless to call close() multiple
        // times.) We do this here instead of in our destructor because close() can cause AddRef()
        // and Release() to be called, and if that happened in our destructor we would be destroyed
        // more than once.
        close();
    }

    ULONG newRef = --m_refCount;
    if (!newRef) {
#if ASSERT_ENABLED
        m_deletionHasBegun = true;
#endif
        delete(this);
    }

    return newRef;
}

// IWebView --------------------------------------------------------------------

HRESULT WebView::canShowMIMEType(_In_ BSTR mimeType, _Out_ BOOL* canShow)
{
    if (!canShow)
        return E_POINTER;

    *canShow = canShowMIMEType(toString(mimeType));

    return S_OK;
}

bool WebView::canShowMIMEType(const String& mimeType)
{
    Frame* coreFrame = core(m_mainFrame);
    bool arePluginsEnabled = coreFrame && coreFrame->arePluginsEnabled();

    bool canShow = MIMETypeRegistry::isSupportedImageMIMEType(mimeType)
        || MIMETypeRegistry::isSupportedNonImageMIMEType(mimeType)
        || MIMETypeRegistry::isSupportedMediaMIMEType(mimeType);

    if (!canShow && m_page) {
        canShow = (m_page->pluginData().supportsWebVisibleMimeType(mimeType, PluginData::AllPlugins) && arePluginsEnabled)
            || m_page->pluginData().supportsWebVisibleMimeType(mimeType, PluginData::OnlyApplicationPlugins);
    }

    if (!canShow)
        canShow = shouldUseEmbeddedView(mimeType);

    return canShow;
}

HRESULT WebView::canShowMIMETypeAsHTML(_In_ BSTR mimeType, _Out_ BOOL* canShow)
{
    if (!canShow)
        return E_POINTER;

    *canShow = canShowMIMETypeAsHTML(toString(mimeType));

    return S_OK;
}

bool WebView::canShowMIMETypeAsHTML(const String& /*mimeType*/)
{
    // FIXME
    notImplemented();
    return true;
}

HRESULT WebView::MIMETypesShownAsHTML(_COM_Outptr_opt_ IEnumVARIANT** enumVariant)
{
    ASSERT_NOT_REACHED();
    if (!enumVariant)
        return E_POINTER;
    *enumVariant = nullptr;
    return E_NOTIMPL;
}

HRESULT WebView::setMIMETypesShownAsHTML(__inout_ecount_full(cMimeTypes) BSTR* mimeTypes, int cMimeTypes)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

HRESULT WebView::URLFromPasteboard(_In_opt_ IDataObject* /*pasteboard*/, _Deref_opt_out_ BSTR* /*url*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

HRESULT WebView::URLTitleFromPasteboard(_In_opt_ IDataObject* /*pasteboard*/, _Deref_opt_out_ BSTR* /*urlTitle*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

bool WebView::shouldInitializeTrackPointHack()
{
    static bool shouldCreateScrollbars;
    static bool hasRunTrackPointCheck;

    if (hasRunTrackPointCheck)
        return shouldCreateScrollbars;

    hasRunTrackPointCheck = true;
    const WCHAR trackPointKeys[][50] = { L"Software\\Lenovo\\TrackPoint",
        L"Software\\Lenovo\\UltraNav",
        L"Software\\Alps\\Apoint\\TrackPoint",
        L"Software\\Synaptics\\SynTPEnh\\UltraNavUSB",
        L"Software\\Synaptics\\SynTPEnh\\UltraNavPS2" };

    for (int i = 0; i < 5; ++i) {
        HKEY trackPointKey = nullptr;
        LSTATUS readKeyResult = ::RegOpenKeyExW(HKEY_CURRENT_USER, trackPointKeys[i], 0, KEY_READ, &trackPointKey);
        ::RegCloseKey(trackPointKey);
        if (readKeyResult == ERROR_SUCCESS) {
            shouldCreateScrollbars = true;
            return shouldCreateScrollbars;
        }
    }

    return shouldCreateScrollbars;
}

HRESULT WebView::initWithFrame(RECT frame, _In_ BSTR frameName, _In_ BSTR groupName)
{
    HRESULT hr = S_OK;

    if (m_viewWindow)
        return E_UNEXPECTED;

    registerWebViewWindowClass();

    m_viewWindow = CreateWindowEx(0, kWebViewWindowClassName, 0, WS_CHILD | WS_CLIPSIBLINGS | WS_CLIPCHILDREN,
        frame.left, frame.top, frame.right - frame.left, frame.bottom - frame.top, m_hostWindow ? m_hostWindow : HWND_MESSAGE, 0, gInstance, 0);
    ASSERT(::IsWindow(m_viewWindow));

    if (shouldInitializeTrackPointHack()) {
        // If we detected a registry key belonging to a TrackPoint driver, then create fake trackpoint
        // scrollbars, so the WebView will receive WM_VSCROLL and WM_HSCROLL messages. We create one
        // vertical scrollbar and one horizontal to allow for receiving both types of messages.
        ::CreateWindowW(L"SCROLLBAR", L"FAKETRACKPOINTHSCROLLBAR", WS_CHILD | WS_VISIBLE | SBS_HORZ, 0, 0, 0, 0, m_viewWindow, 0, gInstance, 0);
        ::CreateWindowW(L"SCROLLBAR", L"FAKETRACKPOINTVSCROLLBAR", WS_CHILD | WS_VISIBLE | SBS_VERT, 0, 0, 0, 0, m_viewWindow, 0, gInstance, 0);
    }

    hr = registerDragDrop();
    if (FAILED(hr))
        return hr;

    WebPreferences* sharedPreferences = WebPreferences::sharedStandardPreferences();
    sharedPreferences->willAddToWebView();
    m_preferences = sharedPreferences;

    static bool didOneTimeInitialization;
    if (!didOneTimeInitialization) {
#if !LOG_DISABLED || !RELEASE_LOG_DISABLED
        logChannels().initializeLogChannelsIfNecessary();
#endif // !LOG_DISABLED || !RELEASE_LOG_DISABLED

        // Initialize our platform strategies first before invoking the rest
        // of the initialization code which may depend on the strategies.
        WebPlatformStrategies::initialize();

        WebKitInitializeWebDatabasesIfNecessary();

        auto& memoryPressureHandler = MemoryPressureHandler::singleton();
        memoryPressureHandler.setLowMemoryHandler([] (Critical critical, Synchronous synchronous) {
            WebCore::releaseMemory(critical, synchronous);
        });
        memoryPressureHandler.install();

        didOneTimeInitialization = true;
     }

    BOOL useHighResolutionTimer;
    if (SUCCEEDED(m_preferences->shouldUseHighResolutionTimers(&useHighResolutionTimer)))
        DeprecatedGlobalSettings::setShouldUseHighResolutionTimers(useHighResolutionTimer);

    m_inspectorClient = new WebInspectorClient(this);

    auto storageProvider = PageStorageSessionProvider::create();

    WebFrame* webFrame = WebFrame::createInstance();
    PageConfiguration configuration(
        PAL::SessionID::defaultSessionID(),
        makeUniqueRef<WebEditorClient>(this),
        SocketProvider::create(),
        makeUniqueRef<LibWebRTCProvider>(),
        CacheStorageProvider::create(),
        m_webViewGroup->userContentController(),
        BackForwardList::create(),
        CookieJar::create(storageProvider.copyRef()),
        makeUniqueRef<WebProgressTrackerClient>(),
        makeUniqueRef<WebFrameLoaderClient>(webFrame),
        makeUniqueRef<DummySpeechRecognitionProvider>(),
        makeUniqueRef<MediaRecorderProvider>(),
        WebBroadcastChannelRegistry::getOrCreate(false),
        WebCore::DummyPermissionController::create(),
        makeUniqueRef<WebCore::DummyStorageProvider>(),
        makeUniqueRef<WebCore::DummyModelPlayerProvider>()
    );
    configuration.chromeClient = new WebChromeClient(this);
#if ENABLE(CONTEXT_MENUS)
    configuration.contextMenuClient = new WebContextMenuClient(this);
#endif
    configuration.dragClient = makeUnique<WebDragClient>(this);
    configuration.inspectorClient = m_inspectorClient;
    configuration.applicationCacheStorage = &WebApplicationCache::storage();
    configuration.databaseProvider = &WebDatabaseProvider::singleton();
    configuration.storageNamespaceProvider = &m_webViewGroup->storageNamespaceProvider();
    configuration.visitedLinkStore = &m_webViewGroup->visitedLinkStore();
    configuration.pluginInfoProvider = &WebPluginInfoProvider::singleton();

    m_page = new Page(WTFMove(configuration));
    storageProvider->setPage(*m_page);
    provideGeolocationTo(m_page, *new WebGeolocationClient(this));

    m_page->addLayoutMilestones({ DidFirstLayout, DidFirstVisuallyNonEmptyLayout });

    if (m_uiDelegate) {
        BString path;
        if (SUCCEEDED(m_uiDelegate->ftpDirectoryTemplatePath(this, &path)))
            m_page->settings().setFTPDirectoryTemplatePath(toString(path));
    }

    webFrame->initWithWebView(this, m_page);
    static_cast<WebFrameLoaderClient&>(m_page->mainFrame().loader().client()).setWebFrame(webFrame);
    static_cast<WebProgressTrackerClient&>(m_page->progress().client()).setWebFrame(webFrame);
    m_mainFrame = webFrame;
    webFrame->Release(); // The WebFrame is owned by the Frame, so release our reference to it.

    m_page->mainFrame().tree().setName(toAtomString(frameName));
    m_page->mainFrame().init();
    setGroupName(groupName);

    addToAllWebViewsSet();

    #pragma warning(suppress: 4244)
    SetWindowLongPtr(m_viewWindow, 0, (LONG_PTR)this);
    ShowWindow(m_viewWindow, SW_SHOW);

    initializeToolTipWindow();
    windowAncestryDidChange();

    IWebNotificationCenter* notifyCenter = WebNotificationCenter::defaultCenterInternal();
    notifyCenter->addObserver(this, WebPreferences::webPreferencesChangedNotification(), static_cast<IWebPreferences*>(m_preferences.get()));
    m_preferences->postPreferencesChangesNotification();

    m_page->setDeviceScaleFactor(deviceScaleFactor());

    setSmartInsertDeleteEnabled(TRUE);

    return hr;
}

static bool initCommonControls()
{
    static bool haveInitialized = false;
    if (haveInitialized)
        return true;

    INITCOMMONCONTROLSEX init;
    init.dwSize = sizeof(init);
    init.dwICC = ICC_TREEVIEW_CLASSES;
    haveInitialized = !!::InitCommonControlsEx(&init);
    return haveInitialized;
}

void WebView::initializeToolTipWindow()
{
    if (!initCommonControls())
        return;

    m_toolTipHwnd = CreateWindowEx(WS_EX_TRANSPARENT, TOOLTIPS_CLASS, 0, WS_POPUP | TTS_NOPREFIX | TTS_ALWAYSTIP,
                                   CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
                                   m_viewWindow, 0, 0, 0);
    if (!m_toolTipHwnd)
        return;

    TOOLINFO info { };
    info.cbSize = sizeof(info);
    info.uFlags = TTF_IDISHWND | TTF_SUBCLASS ;
    info.uId = reinterpret_cast<UINT_PTR>(m_viewWindow);

    ::SendMessage(m_toolTipHwnd, TTM_ADDTOOL, 0, reinterpret_cast<LPARAM>(&info));
    ::SendMessage(m_toolTipHwnd, TTM_SETMAXTIPWIDTH, 0, clampTo<int>(maxToolTipWidth * deviceScaleFactor()));

    ::SetWindowPos(m_toolTipHwnd, HWND_TOP, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
}

static Vector<wchar_t> truncatedString(const String& string)
{
    // Truncate tooltip texts because multiline mode of tooltip control does word-wrapping very slowly
    auto maxLength = 1024;
    auto buffer = string.wideCharacters();
    if (buffer.size() > maxLength) {
        buffer[maxLength - 4] = L'.';
        buffer[maxLength - 3] = L'.';
        buffer[maxLength - 2] = L'.';
        buffer[maxLength - 1] = L'\0';
    }
    return buffer;
}

void WebView::setToolTip(const String& toolTip)
{
    if (!m_toolTipHwnd)
        return;

    if (toolTip == m_toolTip)
        return;

    m_toolTip = toolTip;

    if (!m_toolTip.isEmpty()) {
        TOOLINFO info { };
        info.cbSize = sizeof(info);
        info.uFlags = TTF_IDISHWND;
        info.uId = reinterpret_cast<UINT_PTR>(m_viewWindow);
        auto toolTipCharacters = truncatedString(m_toolTip); // Retain buffer long enough to make the SendMessage call
        info.lpszText = toolTipCharacters.data();
        ::SendMessage(m_toolTipHwnd, TTM_UPDATETIPTEXT, 0, reinterpret_cast<LPARAM>(&info));
    }

    ::SendMessage(m_toolTipHwnd, TTM_ACTIVATE, !m_toolTip.isEmpty(), 0);
}

HRESULT WebView::notifyDidAddIcon(IWebNotification*)
{
    return E_FAIL;
}

void WebView::registerForIconNotification(bool)
{
}

void WebView::dispatchDidReceiveIconFromWebFrame(WebFrame*)
{
}

HRESULT WebView::setAccessibilityDelegate(_In_opt_ IAccessibilityDelegate* d)
{
    m_accessibilityDelegate = d;
    return S_OK;
}

HRESULT WebView::accessibilityDelegate(_COM_Outptr_opt_ IAccessibilityDelegate** d)
{
    if (!d)
        return E_POINTER;
    *d = nullptr;
    if (!m_accessibilityDelegate)
        return E_POINTER;

    return m_accessibilityDelegate.copyRefTo(d);
}

HRESULT WebView::setUIDelegate(_In_opt_ IWebUIDelegate* d)
{
    m_uiDelegate = d;

    if (m_uiDelegatePrivate)
        m_uiDelegatePrivate = 0;

    if (d) {
        if (FAILED(d->QueryInterface(IID_IWebUIDelegatePrivate, (void**)&m_uiDelegatePrivate)))
            m_uiDelegatePrivate = 0;
    }

    return S_OK;
}

HRESULT WebView::uiDelegate(_COM_Outptr_opt_ IWebUIDelegate** d)
{
    if (!d)
        return E_POINTER;
    *d = nullptr;
    if (!m_uiDelegate)
        return E_FAIL;

    return m_uiDelegate.copyRefTo(d);
}

HRESULT WebView::setResourceLoadDelegate(_In_opt_ IWebResourceLoadDelegate* d)
{
    m_resourceLoadDelegate = d;
    return S_OK;
}

HRESULT WebView::resourceLoadDelegate(_COM_Outptr_opt_ IWebResourceLoadDelegate** d)
{
    if (!d)
        return E_POINTER;
    *d = nullptr;
    if (!m_resourceLoadDelegate)
        return E_FAIL;

    return m_resourceLoadDelegate.copyRefTo(d);
}

HRESULT WebView::setDownloadDelegate(_In_opt_ IWebDownloadDelegate* d)
{
    m_downloadDelegate = d;
    return S_OK;
}

HRESULT WebView::downloadDelegate(_COM_Outptr_opt_ IWebDownloadDelegate** d)
{
    if (!d)
        return E_POINTER;
    *d = nullptr;
    if (!m_downloadDelegate)
        return E_FAIL;

    return m_downloadDelegate.copyRefTo(d);
}

HRESULT WebView::setFrameLoadDelegate(_In_opt_ IWebFrameLoadDelegate* d)
{
    m_frameLoadDelegate = d;
    return S_OK;
}

HRESULT WebView::frameLoadDelegate(_COM_Outptr_opt_ IWebFrameLoadDelegate** d)
{
    if (!d)
        return E_POINTER;
    *d = nullptr;
    if (!m_frameLoadDelegate)
        return E_FAIL;

    return m_frameLoadDelegate.copyRefTo(d);
}

HRESULT WebView::setPolicyDelegate(_In_opt_ IWebPolicyDelegate* d)
{
    m_policyDelegate = d;
    return S_OK;
}

HRESULT WebView::policyDelegate(_COM_Outptr_opt_ IWebPolicyDelegate** d)
{
    if (!d)
        return E_POINTER;
    *d = nullptr;
    if (!m_policyDelegate)
        return E_FAIL;

    return m_policyDelegate.copyRefTo(d);
}

HRESULT WebView::mainFrame(_COM_Outptr_opt_ IWebFrame** frame)
{
    if (!frame) {
        ASSERT_NOT_REACHED();
        return E_POINTER;
    }

    *frame = m_mainFrame;
    if (!m_mainFrame)
        return E_UNEXPECTED;

    m_mainFrame->AddRef();
    return S_OK;
}

HRESULT WebView::focusedFrame(_COM_Outptr_opt_ IWebFrame** frame)
{
    if (!frame) {
        ASSERT_NOT_REACHED();
        return E_POINTER;
    }

    *frame = nullptr;
    Frame* f = m_page->focusController().focusedFrame();
    if (!f)
        return E_FAIL;

    WebFrame* webFrame = kit(f);
    if (!webFrame)
        return E_UNEXPECTED;

    return webFrame->QueryInterface(IID_IWebFrame, (void**) frame);
}

HRESULT WebView::backForwardList(_COM_Outptr_opt_ IWebBackForwardList** list)
{
    if (!list) {
        ASSERT_NOT_REACHED();
        return E_POINTER;
    }
    *list = nullptr;
    if (!m_useBackForwardList)
        return E_FAIL;
 
    *list = WebBackForwardList::createInstance(&static_cast<BackForwardList&>(m_page->backForward().client()));

    return S_OK;
}

HRESULT WebView::setMaintainsBackForwardList(BOOL flag)
{
    m_useBackForwardList = !!flag;
    return S_OK;
}

HRESULT WebView::goBack(_Out_ BOOL* succeeded)
{
    if (!succeeded)
        return E_POINTER;

    *succeeded = m_page->backForward().goBack();
    return S_OK;
}

HRESULT WebView::goForward(_Out_ BOOL* succeeded)
{
    if (!succeeded)
        return E_POINTER;

    *succeeded = m_page->backForward().goForward();
    return S_OK;
}

HRESULT WebView::goToBackForwardItem(_In_opt_ IWebHistoryItem* item, _Out_ BOOL* succeeded)
{
    if (!item)
        return E_FAIL;

    if (!succeeded)
        return E_POINTER;

    *succeeded = FALSE;

    COMPtr<WebHistoryItem> webHistoryItem;
    HRESULT hr = item->QueryInterface(&webHistoryItem);
    if (FAILED(hr))
        return hr;

    m_page->goToItem(*webHistoryItem->historyItem(), FrameLoadType::IndexedBackForward, ShouldTreatAsContinuingLoad::No);
    *succeeded = TRUE;

    return S_OK;
}

HRESULT WebView::setTextSizeMultiplier(float multiplier)
{
    if (!m_mainFrame)
        return E_UNEXPECTED;
    setZoomMultiplier(multiplier, true);
    return S_OK;
}

HRESULT WebView::setPageSizeMultiplier(float multiplier)
{
    if (!m_mainFrame)
        return E_UNEXPECTED;
    setZoomMultiplier(multiplier, false);
    return S_OK;
}

void WebView::setZoomMultiplier(float multiplier, bool isTextOnly)
{
    m_zoomMultiplier = multiplier;
    m_zoomsTextOnly = isTextOnly;

    if (Frame* coreFrame = core(m_mainFrame)) {
        if (m_zoomsTextOnly)
            coreFrame->setPageAndTextZoomFactors(1, multiplier);
        else
            coreFrame->setPageAndTextZoomFactors(multiplier, 1);
    }
}

HRESULT WebView::textSizeMultiplier(_Out_ float* multiplier)
{
    if (!multiplier)
        return E_POINTER;

    *multiplier = zoomMultiplier(true);
    return S_OK;
}

HRESULT WebView::pageSizeMultiplier(_Out_ float* multiplier)
{
    if (!multiplier)
        return E_POINTER;

    *multiplier = zoomMultiplier(false);
    return S_OK;
}

float WebView::zoomMultiplier(bool isTextOnly)
{
    if (isTextOnly != m_zoomsTextOnly)
        return 1.0f;
    return m_zoomMultiplier;
}

HRESULT WebView::setApplicationNameForUserAgent(_In_ BSTR applicationName)
{
    m_applicationName = toString(applicationName);
    m_userAgentStandard = String();
    return S_OK;
}

HRESULT WebView::applicationNameForUserAgent(_Deref_opt_out_ BSTR* applicationName)
{
    if (!applicationName)
        return E_POINTER;

    *applicationName = BString(m_applicationName).release();
    if (!*applicationName && m_applicationName.length())
        return E_OUTOFMEMORY;
    return S_OK;
}

HRESULT WebView::setCustomUserAgent(_In_ BSTR userAgentString)
{
    m_userAgentOverridden = userAgentString;
    m_userAgentCustom = toString(userAgentString);
    return S_OK;
}

HRESULT WebView::customUserAgent(_Deref_opt_out_ BSTR* userAgentString)
{
    if (!userAgentString)
        return E_POINTER;

    *userAgentString = nullptr;
    if (!m_userAgentOverridden)
        return S_OK;
    *userAgentString = BString(m_userAgentCustom).release();
    if (!*userAgentString && m_userAgentCustom.length())
        return E_OUTOFMEMORY;
    return S_OK;
}

HRESULT WebView::userAgentForURL(_In_ BSTR url, _Deref_opt_out_ BSTR* userAgent)
{
    if (!userAgent)
        return E_POINTER;

    String userAgentString = userAgentForKURL(MarshallingHelpers::BSTRToKURL(url));
    *userAgent = BString(userAgentString).release();
    if (!*userAgent && userAgentString.length())
        return E_OUTOFMEMORY;
    return S_OK;
}

HRESULT WebView::supportsTextEncoding(_Out_ BOOL* supports)
{
    if (!supports)
        return E_POINTER;

    *supports = TRUE;
    return S_OK;
}

HRESULT WebView::setCustomTextEncodingName(_In_ BSTR encodingName)
{
    if (!m_mainFrame)
        return E_UNEXPECTED;

    HRESULT hr;
    BString oldEncoding;
    hr = customTextEncodingName(&oldEncoding);
    if (FAILED(hr))
        return hr;

    if (oldEncoding != encodingName && (!oldEncoding || !encodingName || wcscmp(oldEncoding, encodingName))) {
        if (Frame* coreFrame = core(m_mainFrame))
            coreFrame->loader().reloadWithOverrideEncoding(toString(encodingName));
    }

    return S_OK;
}

HRESULT WebView::customTextEncodingName(_Deref_opt_out_ BSTR* encodingName)
{
    if (!encodingName)
        return E_POINTER;

    HRESULT hr = S_OK;
    COMPtr<IWebDataSource> dataSource;
    COMPtr<WebDataSource> dataSourceImpl;
    *encodingName = nullptr;

    if (!m_mainFrame)
        return E_UNEXPECTED;

    if (FAILED(m_mainFrame->provisionalDataSource(&dataSource)) || !dataSource) {
        hr = m_mainFrame->dataSource(&dataSource);
        if (FAILED(hr) || !dataSource)
            return hr;
    }

    hr = dataSource->QueryInterface(IID_WebDataSource, (void**)&dataSourceImpl);
    if (FAILED(hr))
        return hr;

    BString str = dataSourceImpl->documentLoader()->overrideEncoding();
    if (FAILED(hr))
        return hr;

    if (!*encodingName)
        *encodingName = BString(m_overrideEncoding).release();

    if (!*encodingName && m_overrideEncoding.length())
        return E_OUTOFMEMORY;

    return S_OK;
}

HRESULT WebView::setMediaStyle(_In_ BSTR /*media*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

HRESULT WebView::mediaStyle(_Deref_opt_out_ BSTR* /*media*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

HRESULT WebView::stringByEvaluatingJavaScriptFromString(_In_ BSTR script, // assumes input does not have "JavaScript" at the begining.
    _Deref_opt_out_ BSTR* result)
{
    if (!result) {
        ASSERT_NOT_REACHED();
        return E_POINTER;
    }

    *result = nullptr;

    Frame* coreFrame = core(m_mainFrame);
    if (!coreFrame)
        return E_UNEXPECTED;

    auto scriptExecutionResult = coreFrame->script().executeScriptIgnoringException(WTF::String(script), true);
    if (!scriptExecutionResult)
        return E_FAIL;
    else if (scriptExecutionResult.isString()) {
        JSC::JSGlobalObject* lexicalGlobalObject = coreFrame->script().globalObject(mainThreadNormalWorld());
        JSC::JSLockHolder lock(lexicalGlobalObject);
        *result = BString(scriptExecutionResult.getString(lexicalGlobalObject));
    }

    return S_OK;
}

HRESULT WebView::windowScriptObject(_COM_Outptr_opt_ IWebScriptObject** webScriptObject)
{
    ASSERT_NOT_REACHED();
    if (!webScriptObject)
        return E_POINTER;
    *webScriptObject = nullptr;
    return E_NOTIMPL;
}

HRESULT WebView::setPreferences(_In_opt_ IWebPreferences* prefs)
{
    if (!prefs)
        prefs = WebPreferences::sharedStandardPreferences();

    if (m_preferences == prefs)
        return S_OK;

    COMPtr<WebPreferences> webPrefs(Query, prefs);
    if (!webPrefs)
        return E_NOINTERFACE;
    webPrefs->willAddToWebView();

    COMPtr<WebPreferences> oldPrefs = m_preferences;

    IWebNotificationCenter* nc = WebNotificationCenter::defaultCenterInternal();
    nc->removeObserver(this, WebPreferences::webPreferencesChangedNotification(), static_cast<IWebPreferences*>(m_preferences.get()));

    BString identifier;
    oldPrefs->identifier(&identifier);
    oldPrefs->didRemoveFromWebView();
    oldPrefs = 0; // Make sure we release the reference, since WebPreferences::removeReferenceForIdentifier will check for last reference to WebPreferences

    m_preferences = webPrefs;

    if (identifier)
        WebPreferences::removeReferenceForIdentifier(identifier);

    nc->addObserver(this, WebPreferences::webPreferencesChangedNotification(), static_cast<IWebPreferences*>(m_preferences.get()));

    m_preferences->postPreferencesChangesNotification();

    return S_OK;
}

HRESULT WebView::preferences(_COM_Outptr_opt_ IWebPreferences** prefs)
{
    if (!prefs)
        return E_POINTER;
    *prefs = m_preferences.get();
    if (m_preferences)
        m_preferences->AddRef();
    return S_OK;
}

HRESULT WebView::setPreferencesIdentifier(_In_ BSTR /*anIdentifier*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

HRESULT WebView::preferencesIdentifier(_Deref_opt_out_ BSTR* /*anIdentifier*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

static void systemParameterChanged(WPARAM parameter)
{
#if USE(CG)
    if (parameter == SPI_SETFONTSMOOTHING || parameter == SPI_SETFONTSMOOTHINGTYPE || parameter == SPI_SETFONTSMOOTHINGCONTRAST || parameter == SPI_SETFONTSMOOTHINGORIENTATION)
        FontCascade::systemFontSmoothingChanged();
#endif
}

void WebView::windowReceivedMessage(HWND, UINT message, WPARAM wParam, LPARAM)
{
    switch (message) {
    case WM_NCACTIVATE:
        updateActiveStateSoon();
        if (!wParam)
            deleteBackingStoreSoon();
        break;
    case WM_SETTINGCHANGE:
        systemParameterChanged(wParam);
        break;
    }
}

void WebView::updateActiveStateSoon() const
{
    // This function is called while processing the WM_NCACTIVATE message.
    // While processing WM_NCACTIVATE when we are being deactivated, GetActiveWindow() will
    // still return our window. If we were to call updateActiveState() in that case, we would
    // wrongly think that we are still the active window. To work around this, we update our
    // active state after a 0-delay timer fires, at which point GetActiveWindow() will return
    // the newly-activated window.

    SetTimer(m_viewWindow, UpdateActiveStateTimer, 0, 0);
}

void WebView::deleteBackingStoreSoon()
{
    if (pendingDeleteBackingStoreSet().size() > 2) {
        Vector<WebView*> views;
        HashSet<WebView*>::iterator end = pendingDeleteBackingStoreSet().end();
        for (HashSet<WebView*>::iterator it = pendingDeleteBackingStoreSet().begin(); it != end; ++it)
            views.append(*it);
        for (int i = 0; i < views.size(); ++i)
            views[i]->deleteBackingStore();
        ASSERT(pendingDeleteBackingStoreSet().isEmpty());
    }

    pendingDeleteBackingStoreSet().add(this);
    m_deleteBackingStoreTimerActive = true;
    SetTimer(m_viewWindow, DeleteBackingStoreTimer, delayBeforeDeletingBackingStoreMsec, 0);
}

void WebView::cancelDeleteBackingStoreSoon()
{
    if (!m_deleteBackingStoreTimerActive)
        return;
    pendingDeleteBackingStoreSet().remove(this);
    m_deleteBackingStoreTimerActive = false;
    KillTimer(m_viewWindow, DeleteBackingStoreTimer);
}

HRESULT WebView::setHostWindow(_In_ HWND window)
{
    if (m_viewWindow) {
        if (window)
            SetParent(m_viewWindow, window);
        else if (!isBeingDestroyed()) {
            // Turn the WebView into a message-only window so it will no longer be a child of the
            // old host window and will be hidden from screen. We only do this when
            // isBeingDestroyed() is false because doing this while handling WM_DESTROY can leave
            // m_viewWindow in a weird state (see <http://webkit.org/b/29337>).
            SetParent(m_viewWindow, HWND_MESSAGE);
        }
    }

    m_hostWindow = window;

    windowAncestryDidChange();

    if (m_page)
        m_page->setDeviceScaleFactor(deviceScaleFactor());

    return S_OK;
}

HRESULT WebView::hostWindow(_Deref_opt_out_ HWND* window)
{
    if (!window)
        return E_POINTER;

    *window = m_hostWindow;
    return S_OK;
}


static Frame *incrementFrame(Frame *curr, bool forward, bool wrapFlag)
{
    CanWrap canWrap = wrapFlag ? CanWrap::Yes : CanWrap::No;
    return forward
        ? curr->tree().traverseNext(canWrap)
        : curr->tree().traversePrevious(canWrap);
}

HRESULT WebView::searchFor(_In_ BSTR str, BOOL forward, BOOL caseFlag, BOOL wrapFlag, _Out_ BOOL* found)
{
    if (!found)
        return E_INVALIDARG;
    
    if (!m_page)
        return E_FAIL;

    if (!str || !SysStringLen(str))
        return E_INVALIDARG;

    FindOptions options;
    if (!caseFlag)
        options.add(CaseInsensitive);
    if (!forward)
        options.add(Backwards);
    if (wrapFlag)
        options.add(WrapAround);
    *found = m_page->findString(toString(str), options);
    return S_OK;
}

bool WebView::active()
{
    HWND activeWindow = GetActiveWindow();
    if (usesLayeredWindow() && activeWindow == m_viewWindow)
        return true;

    return (activeWindow && m_topLevelParent == findTopLevelParent(activeWindow));
}

void WebView::updateActiveState()
{
    if (m_page)
        m_page->focusController().setActive(active());
}

HRESULT WebView::updateFocusedAndActiveState()
{
    updateActiveState();

    bool active = m_page->focusController().isActive();
    Frame& mainFrame = m_page->mainFrame();
    Frame& focusedFrame = m_page->focusController().focusedOrMainFrame();
    mainFrame.selection().setFocused(active && &mainFrame == &focusedFrame);

    return S_OK;
}

HRESULT WebView::executeCoreCommandByName(_In_ BSTR name, _In_ BSTR value)
{
    if (!m_page)
        return E_FAIL;

    m_page->focusController().focusedOrMainFrame().editor().command(toString(name)).execute(toString(value));

    return S_OK;
}

HRESULT WebView::clearMainFrameName()
{
    if (!m_page)
        return E_FAIL;

    m_page->mainFrame().tree().clearName();

    return S_OK;
}

HRESULT WebView::markAllMatchesForText(_In_ BSTR str, BOOL caseSensitive, BOOL highlight, UINT limit, _Out_ UINT* matches)
{
    if (!matches)
        return E_INVALIDARG;

    if (!m_page)
        return E_FAIL;

    if (!str || !SysStringLen(str))
        return E_INVALIDARG;

    WebCore::FindOptions options;
    if (!caseSensitive)
        options.add(WebCore::CaseInsensitive);

    *matches = m_page->markAllMatchesForText(toString(str), options, highlight, limit);
    return S_OK;
}

HRESULT WebView::unmarkAllTextMatches()
{
    if (!m_page)
        return E_FAIL;

    m_page->unmarkAllTextMatches();
    return S_OK;
}

HRESULT WebView::rectsForTextMatches(_COM_Outptr_opt_ IEnumTextMatches** pmatches)
{
    if (!pmatches)
        return E_POINTER;
    *pmatches = nullptr;
    if (!m_page)
        return E_FAIL;

    Vector<IntRect> allRects;
    WebCore::Frame* frame = &m_page->mainFrame();
    do {
        if (Document* document = frame->document()) {
            IntRect visibleRect = frame->view()->visibleContentRect();
            Vector<FloatRect> frameRects = document->markers().renderedRectsForMarkers(DocumentMarker::TextMatch);
            IntPoint frameOffset = -frame->view()->scrollPosition();
            frameOffset = frame->view()->convertToContainingWindow(frameOffset);

            Vector<FloatRect>::iterator end = frameRects.end();
            for (Vector<FloatRect>::iterator it = frameRects.begin(); it < end; it++) {
                it->intersect(visibleRect);
                it->move(frameOffset.x(), frameOffset.y());
                allRects.append(enclosingIntRect(*it));
            }
        }
        frame = incrementFrame(frame, true, false);
    } while (frame);

    return createMatchEnumerator(&allRects, pmatches);
}

HRESULT WebView::generateSelectionImage(BOOL forceWhiteText, _Deref_opt_out_ HBITMAP* hBitmap)
{
    if (!hBitmap)
        return E_POINTER;

    if (!m_page)
        return E_FAIL;

    *hBitmap = nullptr;

    WebCore::Frame& frame = m_page->focusController().focusedOrMainFrame();

    auto bitmap = imageFromSelection(&frame, forceWhiteText ? TRUE : FALSE);
    *hBitmap = bitmap.leak();

    return S_OK;
}

HRESULT WebView::selectionRect(_Inout_ RECT* rc)
{
    if (!rc)
        return E_POINTER;

    if (!m_page)
        return E_FAIL;

    WebCore::Frame& frame = m_page->focusController().focusedOrMainFrame();

    IntRect ir = enclosingIntRect(frame.selection().selectionBounds());
    ir = frame.view()->convertToContainingWindow(ir);
    ir.moveBy(-frame.view()->scrollPosition());

    float scaleFactor = deviceScaleFactor();
    rc->left = ir.x() * scaleFactor;
    rc->top = ir.y() * scaleFactor;
    rc->bottom = rc->top + ir.height() * scaleFactor;
    rc->right = rc->left + ir.width() * scaleFactor;

    return S_OK;
}

HRESULT WebView::registerViewClass(_In_opt_ IWebDocumentView*, _In_opt_ IWebDocumentRepresentation*, _In_ BSTR /*forMIMEType*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

HRESULT WebView::setGroupName(_In_ BSTR groupName)
{
    if (m_webViewGroup)
        m_webViewGroup->removeWebView(this);

    m_webViewGroup = WebViewGroup::getOrCreate(groupName, localStorageDatabasePath(m_preferences.get()));
    m_webViewGroup->addWebView(this);

    if (!m_page)
        return S_OK;

    m_page->setUserContentProvider(m_webViewGroup->userContentController());
    m_page->setVisitedLinkStore(m_webViewGroup->visitedLinkStore());
    m_page->setGroupName(toString(groupName));
    return S_OK;
}
    
HRESULT WebView::groupName(_Deref_opt_out_ BSTR* groupName)
{
    if (!groupName)
        return E_POINTER;

    *groupName = nullptr;
    if (!m_page)
        return S_OK;
    String groupNameString = m_page->groupName();
    *groupName = BString(groupNameString).release();
    if (!*groupName && groupNameString.length())
        return E_OUTOFMEMORY;
    return S_OK;
}
    
HRESULT WebView::estimatedProgress(_Out_ double* estimatedProgress)
{
    if (!estimatedProgress)
        return E_POINTER;
    *estimatedProgress = m_page->progress().estimatedProgress();
    return S_OK;
}
    
HRESULT WebView::isLoading(_Out_ BOOL* isLoading)
{
    COMPtr<IWebDataSource> dataSource;
    COMPtr<IWebDataSource> provisionalDataSource;

    if (!isLoading)
        return E_POINTER;

    *isLoading = FALSE;

    if (!m_mainFrame)
        return E_UNEXPECTED;

    if (SUCCEEDED(m_mainFrame->dataSource(&dataSource)))
        dataSource->isLoading(isLoading);

    if (*isLoading)
        return S_OK;

    if (SUCCEEDED(m_mainFrame->provisionalDataSource(&provisionalDataSource)))
        provisionalDataSource->isLoading(isLoading);
    return S_OK;
}
    
HRESULT WebView::elementAtPoint(_In_ LPPOINT point, _COM_Outptr_opt_ IPropertyBag** elementDictionary)
{
    if (!elementDictionary || !point) {
        ASSERT_NOT_REACHED();
        return E_POINTER;
    }

    *elementDictionary = nullptr;

    Frame* frame = core(m_mainFrame);
    if (!frame)
        return E_UNEXPECTED;

    IntPoint webCorePoint = IntPoint(point->x, point->y);
    float inverseScaleFactor = 1.0f / deviceScaleFactor();
    webCorePoint.scale(inverseScaleFactor, inverseScaleFactor);
    HitTestResult result = HitTestResult(webCorePoint);
    if (frame->contentRenderer()) {
        constexpr OptionSet<HitTestRequest::Type> hitType { HitTestRequest::Type::ReadOnly, HitTestRequest::Type::Active, HitTestRequest::Type::DisallowUserAgentShadowContent, HitTestRequest::Type::AllowChildFrameContent };
        result = frame->eventHandler().hitTestResultAtPoint(webCorePoint, hitType);
    }
    *elementDictionary = WebElementPropertyBag::createInstance(result);
    return S_OK;
}
    
HRESULT WebView::pasteboardTypesForSelection(_COM_Outptr_opt_ IEnumVARIANT** enumVariant)
{
    ASSERT_NOT_REACHED();
    if (!enumVariant)
        return E_POINTER;
    *enumVariant = nullptr;
    return E_NOTIMPL;
}
    
HRESULT WebView::writeSelectionWithPasteboardTypes(__inout_ecount_full(cTypes) BSTR* types, int cTypes, _In_opt_ IDataObject* /*pasteboard*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::pasteboardTypesForElement(_In_opt_ IPropertyBag* /*elementDictionary*/, _COM_Outptr_opt_ IEnumVARIANT** enumVariant)
{
    ASSERT_NOT_REACHED();
    if (!enumVariant)
        return E_POINTER;
    *enumVariant = nullptr;
    return E_NOTIMPL;
}
    
HRESULT WebView::writeElement(_In_opt_ IPropertyBag* /*elementDictionary*/, __inout_ecount_full(cWithPasteboardTypes) BSTR* withPasteboardTypes, int cWithPasteboardTypes, _In_opt_ IDataObject* /*pasteboard*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::selectedText(_Deref_opt_out_ BSTR* text)
{
    if (!text) {
        ASSERT_NOT_REACHED();
        return E_POINTER;
    }

    *text = nullptr;

    Frame* focusedFrame = m_page ? &m_page->focusController().focusedOrMainFrame() : 0;
    if (!focusedFrame)
        return E_FAIL;

    String frameSelectedText = focusedFrame->editor().selectedText();
    *text = BString(frameSelectedText).release();
    if (!*text && frameSelectedText.length())
        return E_OUTOFMEMORY;
    return S_OK;
}

HRESULT WebView::centerSelectionInVisibleArea(_In_opt_ IUnknown* /* sender */)
{
    Frame* coreFrame = core(m_mainFrame);
    if (!coreFrame)
        return E_UNEXPECTED;

    coreFrame->selection().revealSelection(SelectionRevealMode::Reveal, ScrollAlignment::alignCenterAlways);
    return S_OK;
}


HRESULT WebView::moveDragCaretToPoint(_In_ LPPOINT /*point*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::removeDragCaret()
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::setDrawsBackground(BOOL /*drawsBackground*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::drawsBackground(_Out_ BOOL* /*drawsBackground*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::setMainFrameURL(_In_ BSTR /*urlString*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::mainFrameURL(_Deref_opt_out_ BSTR* urlString)
{
    if (!urlString)
        return E_POINTER;

    if (!m_mainFrame)
        return E_UNEXPECTED;

    COMPtr<IWebDataSource> dataSource;

    if (FAILED(m_mainFrame->provisionalDataSource(&dataSource))) {
        if (FAILED(m_mainFrame->dataSource(&dataSource)))
            return E_FAIL;
    }

    if (!dataSource) {
        *urlString = nullptr;
        return S_OK;
    }
    
    COMPtr<IWebMutableURLRequest> request;
    if (FAILED(dataSource->request(&request)) || !request)
        return E_FAIL;

    if (FAILED(request->URL(urlString)))
        return E_FAIL;

    return S_OK;
}
    
HRESULT WebView::mainFrameDocument(_COM_Outptr_opt_ IDOMDocument** document)
{
    if (!document)
        return E_POINTER;

    *document = nullptr;

    if (!m_mainFrame)
        return E_UNEXPECTED;
    return m_mainFrame->DOMDocument(document);
}
    
HRESULT WebView::mainFrameTitle(_Deref_opt_out_ BSTR* /*title*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::mainFrameIcon(_Deref_opt_out_ HBITMAP* /*hBitmap*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

HRESULT WebView::registerURLSchemeAsLocal(_In_ BSTR scheme)
{
    if (!scheme)
        return E_POINTER;

    LegacySchemeRegistry::registerURLSchemeAsLocal(toString(scheme));

    return S_OK;
}

// IWebIBActions ---------------------------------------------------------------

HRESULT WebView::takeStringURLFrom(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::stopLoading(_In_opt_ IUnknown* /*sender*/)
{
    if (!m_mainFrame)
        return E_UNEXPECTED;

    return m_mainFrame->stopLoading();
}
    
HRESULT WebView::reload(_In_opt_ IUnknown* /*sender*/)
{
    if (!m_mainFrame)
        return E_UNEXPECTED;

    return m_mainFrame->reload();
}
    
HRESULT WebView::canGoBack(_In_opt_ IUnknown* /*sender*/, _Out_ BOOL* result)
{
    if (!result)
        return E_POINTER;

    *result = !!(m_page->backForward().backItem() && !m_page->defersLoading());
    return S_OK;
}
    
HRESULT WebView::goBack(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::canGoForward(_In_opt_ IUnknown* /*sender*/, _Out_ BOOL* result)
{
    if (!result)
        return E_POINTER;
    
    *result = !!(m_page->backForward().forwardItem() && !m_page->defersLoading());
    return S_OK;
}
    
HRESULT WebView::goForward(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

// FIXME: This code should move into WebCore so it can be shared by all the WebKits.
#define MinimumZoomMultiplier   0.5f
#define MaximumZoomMultiplier   3.0f
#define ZoomMultiplierRatio     1.2f

HRESULT WebView::canMakeTextLarger(_In_opt_ IUnknown* /*sender*/, _Out_ BOOL* result)
{
    if (!result)
        return E_POINTER;

    bool canGrowMore = canZoomIn(m_zoomsTextOnly);
    *result = canGrowMore ? TRUE : FALSE;
    return S_OK;
}

HRESULT WebView::canZoomPageIn(_In_opt_ IUnknown* /*sender*/, _Out_ BOOL* result)
{
    if (!result)
        return E_POINTER;

    bool canGrowMore = canZoomIn(false);
    *result = canGrowMore ? TRUE : FALSE;
    return S_OK;
}

bool WebView::canZoomIn(bool isTextOnly)
{
    return zoomMultiplier(isTextOnly) * ZoomMultiplierRatio < MaximumZoomMultiplier;
}
    
HRESULT WebView::makeTextLarger(_In_opt_ IUnknown* /*sender*/)
{
    return zoomIn(m_zoomsTextOnly);
}

HRESULT WebView::zoomPageIn(_In_opt_ IUnknown* /*sender*/)
{
    return zoomIn(false);
}

HRESULT WebView::zoomIn(bool isTextOnly)
{
    if (!canZoomIn(isTextOnly))
        return E_FAIL;
    setZoomMultiplier(zoomMultiplier(isTextOnly) * ZoomMultiplierRatio, isTextOnly);
    return S_OK;
}

HRESULT WebView::canMakeTextSmaller(_In_opt_ IUnknown* /*sender*/, _Out_ BOOL* result)
{
    if (!result)
        return E_POINTER;

    bool canShrinkMore = canZoomOut(m_zoomsTextOnly);
    *result = canShrinkMore ? TRUE : FALSE;
    return S_OK;
}

HRESULT WebView::canZoomPageOut(_In_opt_ IUnknown* /*sender*/, _Out_ BOOL* result)
{
    if (!result)
        return E_POINTER;

    bool canShrinkMore = canZoomOut(false);
    *result = canShrinkMore ? TRUE : FALSE;
    return S_OK;
}

bool WebView::canZoomOut(bool isTextOnly)
{
    return zoomMultiplier(isTextOnly) / ZoomMultiplierRatio > MinimumZoomMultiplier;
}

HRESULT WebView::makeTextSmaller(_In_opt_ IUnknown* /*sender*/)
{
    return zoomOut(m_zoomsTextOnly);
}

HRESULT WebView::zoomPageOut(_In_opt_ IUnknown* /*sender*/)
{
    return zoomOut(false);
}

HRESULT WebView::zoomOut(bool isTextOnly)
{
    if (!canZoomOut(isTextOnly))
        return E_FAIL;
    setZoomMultiplier(zoomMultiplier(isTextOnly) / ZoomMultiplierRatio, isTextOnly);
    return S_OK;
}

HRESULT WebView::canMakeTextStandardSize(_In_opt_ IUnknown* /*sender*/, _Out_ BOOL* result)
{
    if (!result)
        return E_POINTER;

    // Since we always reset text zoom and page zoom together, this should continue to return an answer about text zoom even if its not enabled.
    bool notAlreadyStandard = canResetZoom(true);
    *result = notAlreadyStandard ? TRUE : FALSE;
    return S_OK;
}

HRESULT WebView::canResetPageZoom(_In_opt_ IUnknown* /*sender*/, _Out_ BOOL* result)
{
    if (!result)
        return E_POINTER;

    bool notAlreadyStandard = canResetZoom(false);
    *result = notAlreadyStandard ? TRUE : FALSE;
    return S_OK;
}

bool WebView::canResetZoom(bool isTextOnly)
{
    return zoomMultiplier(isTextOnly) != 1.0f;
}

HRESULT WebView::makeTextStandardSize(_In_opt_ IUnknown* /*sender*/)
{
    return resetZoom(true);
}

HRESULT WebView::resetPageZoom(_In_opt_ IUnknown* /*sender*/)
{
    return resetZoom(false);
}

HRESULT WebView::resetZoom(bool isTextOnly)
{
    if (!canResetZoom(isTextOnly))
        return E_FAIL;
    setZoomMultiplier(1.0f, isTextOnly);
    return S_OK;
}

HRESULT WebView::toggleContinuousSpellChecking(_In_opt_ IUnknown* /*sender*/)
{
    HRESULT hr;
    BOOL enabled;
    if (FAILED(hr = isContinuousSpellCheckingEnabled(&enabled)))
        return hr;
    return setContinuousSpellCheckingEnabled(enabled ? FALSE : TRUE);
}

HRESULT WebView::toggleSmartInsertDelete(_In_opt_ IUnknown* /*sender*/)
{
    BOOL enabled = FALSE;
    HRESULT hr = smartInsertDeleteEnabled(&enabled);
    if (FAILED(hr))
        return hr;

    return setSmartInsertDeleteEnabled(enabled ? FALSE : TRUE);
}

HRESULT WebView::toggleGrammarChecking(_In_opt_ IUnknown* /*sender*/)
{
    BOOL enabled;
    HRESULT hr = isGrammarCheckingEnabled(&enabled);
    if (FAILED(hr))
        return hr;

    return setGrammarCheckingEnabled(enabled ? FALSE : TRUE);
}

HRESULT WebView::reloadFromOrigin(_In_opt_ IUnknown* /*sender*/)
{
    if (!m_mainFrame)
        return E_UNEXPECTED;

    return m_mainFrame->reloadFromOrigin();
}

// IWebViewCSS -----------------------------------------------------------------

HRESULT WebView::computedStyleForElement(_In_opt_ IDOMElement* /*element*/, _In_ BSTR /*pseudoElement*/, _COM_Outptr_opt_ IDOMCSSStyleDeclaration** style)
{
    ASSERT_NOT_REACHED();
    if (!style)
        return E_POINTER;
    *style = nullptr;
    return E_NOTIMPL;
}

// IWebViewEditing -------------------------------------------------------------

HRESULT WebView::editableDOMRangeForPoint(_In_ LPPOINT /*point*/, _COM_Outptr_opt_ IDOMRange** range)
{
    ASSERT_NOT_REACHED();
    if (!range)
        return E_POINTER;
    *range = nullptr;
    return E_NOTIMPL;
}
    
HRESULT WebView::setSelectedDOMRange(_In_opt_ IDOMRange* /*range*/,  WebSelectionAffinity /*affinity*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::selectedDOMRange(_COM_Outptr_opt_ IDOMRange** range)
{
    ASSERT_NOT_REACHED();
    if (!range)
        return E_POINTER;
    *range = nullptr;
    return E_NOTIMPL;
}
    
HRESULT WebView::selectionAffinity(_Out_ WebSelectionAffinity*)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::setEditable(BOOL flag)
{
    if (!m_page)
        return S_OK;

    if (m_page->isEditable() == static_cast<bool>(flag))
        return S_OK;

    m_page->setEditable(flag);
    if (!m_page->tabKeyCyclesThroughElements())
        m_page->setTabKeyCyclesThroughElements(!flag);

    return S_OK;
}
    
HRESULT WebView::isEditable(_Out_ BOOL* isEditable)
{
    if (!isEditable)
        return E_POINTER;

    if (!m_page) {
        *isEditable = FALSE;
        return S_OK;
    }

    *isEditable = m_page->isEditable();

    return S_OK;
}
    
HRESULT WebView::setTypingStyle(_In_opt_ IDOMCSSStyleDeclaration* /*style*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::typingStyle(_COM_Outptr_opt_ IDOMCSSStyleDeclaration** style)
{
    ASSERT_NOT_REACHED();
    if (!style)
        return E_POINTER;
    *style = nullptr;
    return E_NOTIMPL;
}
    
HRESULT WebView::setSmartInsertDeleteEnabled(BOOL flag)
{
    if (m_page->settings().smartInsertDeleteEnabled() != !!flag) {
        m_page->settings().setSmartInsertDeleteEnabled(!!flag);
        setSelectTrailingWhitespaceEnabled(!flag);
    }
    return S_OK;
}
    
HRESULT WebView::smartInsertDeleteEnabled(_Out_ BOOL* enabled)
{
    if (!enabled)
        return E_POINTER;

    *enabled = m_page->settings().smartInsertDeleteEnabled() ? TRUE : FALSE;
    return S_OK;
}
 
HRESULT WebView::setSelectTrailingWhitespaceEnabled(BOOL flag)
{
    if (!m_page)
        return E_FAIL;

    if (m_page->settings().selectTrailingWhitespaceEnabled() != !!flag) {
        m_page->settings().setSelectTrailingWhitespaceEnabled(!!flag);
        setSmartInsertDeleteEnabled(!flag);
    }
    return S_OK;
}
    
HRESULT WebView::isSelectTrailingWhitespaceEnabled(_Out_ BOOL* enabled)
{
    if (!enabled)
        return E_POINTER;

    *enabled = m_page->settings().selectTrailingWhitespaceEnabled() ? TRUE : FALSE;
    return S_OK;
}

HRESULT WebView::setContinuousSpellCheckingEnabled(BOOL flag)
{
    if (continuousSpellCheckingEnabled != !!flag) {
        continuousSpellCheckingEnabled = !!flag;
        COMPtr<IWebPreferences> prefs;
        if (SUCCEEDED(preferences(&prefs)))
            prefs->setContinuousSpellCheckingEnabled(flag);
    }
    
    BOOL spellCheckingEnabled;
    if (SUCCEEDED(isContinuousSpellCheckingEnabled(&spellCheckingEnabled)) && spellCheckingEnabled)
        preflightSpellChecker();
    else
        m_mainFrame->unmarkAllMisspellings();

    return S_OK;
}
    
HRESULT WebView::isContinuousSpellCheckingEnabled(_Out_ BOOL* enabled)
{
    if (!enabled)
        return E_POINTER;

    *enabled = (continuousSpellCheckingEnabled && continuousCheckingAllowed()) ? TRUE : FALSE;
    return S_OK;
}
    
HRESULT WebView::spellCheckerDocumentTag(_Out_ int* tag)
{
    if (!tag)
        return E_POINTER;

    // we just use this as a flag to indicate that we've spell checked the document
    // and need to close the spell checker out when the view closes.
    *tag = 0;
    m_hasSpellCheckerDocumentTag = true;
    return S_OK;
}

static COMPtr<IWebEditingDelegate> spellingDelegateForTimer;

static void preflightSpellCheckerNow()
{
    spellingDelegateForTimer->preflightChosenSpellServer();
    spellingDelegateForTimer = 0;
}

static void CALLBACK preflightSpellCheckerTimerCallback(HWND, UINT, UINT_PTR id, DWORD)
{
    ::KillTimer(0, id);
    preflightSpellCheckerNow();
}

void WebView::preflightSpellChecker()
{
    // As AppKit does, we wish to delay tickling the shared spellchecker into existence on application launch.
    if (!m_editingDelegate)
        return;

    BOOL exists;
    spellingDelegateForTimer = m_editingDelegate;
    if (SUCCEEDED(m_editingDelegate->sharedSpellCheckerExists(&exists)) && exists)
        preflightSpellCheckerNow();
    else
        ::SetTimer(0, 0, 2000, preflightSpellCheckerTimerCallback);
}

bool WebView::continuousCheckingAllowed()
{
    static bool allowContinuousSpellChecking = true;
    static bool readAllowContinuousSpellCheckingDefault = false;
    if (!readAllowContinuousSpellCheckingDefault) {
        COMPtr<IWebPreferences> prefs;
        if (SUCCEEDED(preferences(&prefs))) {
            BOOL allowed;
            prefs->allowContinuousSpellChecking(&allowed);
            allowContinuousSpellChecking = !!allowed;
        }
        readAllowContinuousSpellCheckingDefault = true;
    }
    return allowContinuousSpellChecking;
}

HRESULT WebView::undoManager(_COM_Outptr_opt_ IWebUndoManager** manager)
{
    ASSERT_NOT_REACHED();
    if (!manager)
        return E_POINTER;
    *manager = nullptr;
    return E_NOTIMPL;
}
    
HRESULT WebView::setEditingDelegate(_In_opt_ IWebEditingDelegate* d)
{
    if (m_editingDelegate == d)
        return S_OK;

    static BSTR webViewDidBeginEditingNotificationName = SysAllocString(WebViewDidBeginEditingNotification);
    static BSTR webViewDidChangeSelectionNotificationName = SysAllocString(WebViewDidChangeSelectionNotification);
    static BSTR webViewDidEndEditingNotificationName = SysAllocString(WebViewDidEndEditingNotification);
    static BSTR webViewDidChangeTypingStyleNotificationName = SysAllocString(WebViewDidChangeTypingStyleNotification);
    static BSTR webViewDidChangeNotificationName = SysAllocString(WebViewDidChangeNotification);

    IWebNotificationCenter* notifyCenter = WebNotificationCenter::defaultCenterInternal();

    COMPtr<IWebNotificationObserver> wasObserver(Query, m_editingDelegate);
    if (wasObserver) {
        notifyCenter->removeObserver(wasObserver.get(), webViewDidBeginEditingNotificationName, nullptr);
        notifyCenter->removeObserver(wasObserver.get(), webViewDidChangeSelectionNotificationName, nullptr);
        notifyCenter->removeObserver(wasObserver.get(), webViewDidEndEditingNotificationName, nullptr);
        notifyCenter->removeObserver(wasObserver.get(), webViewDidChangeTypingStyleNotificationName, nullptr);
        notifyCenter->removeObserver(wasObserver.get(), webViewDidChangeNotificationName, nullptr);
    }

    m_editingDelegate = d;

    COMPtr<IWebNotificationObserver> isObserver(Query, m_editingDelegate);
    if (isObserver) {
        notifyCenter->addObserver(isObserver.get(), webViewDidBeginEditingNotificationName, nullptr);
        notifyCenter->addObserver(isObserver.get(), webViewDidChangeSelectionNotificationName, nullptr);
        notifyCenter->addObserver(isObserver.get(), webViewDidEndEditingNotificationName, nullptr);
        notifyCenter->addObserver(isObserver.get(), webViewDidChangeTypingStyleNotificationName, nullptr);
        notifyCenter->addObserver(isObserver.get(), webViewDidChangeNotificationName, nullptr);
    }

    return S_OK;
}
    
HRESULT WebView::editingDelegate(_COM_Outptr_opt_ IWebEditingDelegate** d)
{
    if (!d) {
        ASSERT_NOT_REACHED();
        return E_POINTER;
    }

    *d = m_editingDelegate.get();
    if (!*d)
        return E_FAIL;

    (*d)->AddRef();
    return S_OK;
}
    
HRESULT WebView::styleDeclarationWithText(_In_ BSTR /*text*/, _COM_Outptr_opt_ IDOMCSSStyleDeclaration** style)
{
    ASSERT_NOT_REACHED();
    if (!style)
        return E_POINTER;
    *style = nullptr;
    return E_NOTIMPL;
}
    
HRESULT WebView::hasSelectedRange(_Out_ BOOL* hasSelectedRange)
{
    if (!hasSelectedRange)
        return E_POINTER;

    *hasSelectedRange = m_page->mainFrame().selection().isRange();
    return S_OK;
}
    
HRESULT WebView::cutEnabled(_Out_ BOOL* enabled)
{
    if (!enabled)
        return E_POINTER;

    Editor& editor = m_page->focusController().focusedOrMainFrame().editor();
    *enabled = editor.canCut() || editor.canDHTMLCut();
    return S_OK;
}
    
HRESULT WebView::copyEnabled(_Out_ BOOL* enabled)
{
    if (!enabled)
        return E_POINTER;

    Editor& editor = m_page->focusController().focusedOrMainFrame().editor();
    *enabled = editor.canCopy() || editor.canDHTMLCopy();
    return S_OK;
}
    
HRESULT WebView::pasteEnabled(_Out_ BOOL* enabled)
{
    if (!enabled)
        return E_POINTER;

    Editor& editor = m_page->focusController().focusedOrMainFrame().editor();
    *enabled = editor.canPaste() || editor.canDHTMLPaste();
    return S_OK;
}
    
HRESULT WebView::deleteEnabled(_Out_ BOOL* enabled)
{
    if (!enabled)
        return E_POINTER;

    *enabled = m_page->focusController().focusedOrMainFrame().editor().canDelete();
    return S_OK;
}
    
HRESULT WebView::editingEnabled(_Out_ BOOL* enabled)
{
    if (!enabled)
        return E_POINTER;

    *enabled = m_page->focusController().focusedOrMainFrame().editor().canEdit();
    return S_OK;
}

HRESULT WebView::isGrammarCheckingEnabled(_Out_ BOOL* enabled)
{
    if (!enabled)
        return E_POINTER;

    *enabled = grammarCheckingEnabled ? TRUE : FALSE;
    return S_OK;
}

HRESULT WebView::setGrammarCheckingEnabled(BOOL enabled)
{
    if (!m_editingDelegate) {
        LOG_ERROR("No NSSpellChecker");
        return E_FAIL;
    }

    if (grammarCheckingEnabled == !!enabled)
        return S_OK;
    
    grammarCheckingEnabled = !!enabled;
    COMPtr<IWebPreferences> prefs;
    if (SUCCEEDED(preferences(&prefs)))
        prefs->setGrammarCheckingEnabled(enabled);
    
    m_editingDelegate->updateGrammar();

    // We call _preflightSpellChecker when turning continuous spell checking on, but we don't need to do that here
    // because grammar checking only occurs on code paths that already preflight spell checking appropriately.
    
    BOOL grammarEnabled;
    if (SUCCEEDED(isGrammarCheckingEnabled(&grammarEnabled)) && !grammarEnabled)
        m_mainFrame->unmarkAllBadGrammar();

    return S_OK;
}

// IWebViewUndoableEditing -----------------------------------------------------

HRESULT WebView::replaceSelectionWithNode(_In_opt_ IDOMNode* /*node*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::replaceSelectionWithText(_In_ BSTR text)
{
    if (!m_page)
        return E_FAIL;

    Position start = m_page->mainFrame().selection().selection().start();
    m_page->focusController().focusedOrMainFrame().editor().insertText(toString(text), 0);
    m_page->mainFrame().selection().setBase(start);
    return S_OK;
}
    
HRESULT WebView::replaceSelectionWithMarkupString(_In_ BSTR /*markupString*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::replaceSelectionWithArchive(_In_opt_ IWebArchive* /*archive*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::deleteSelection()
{
    if (!m_page)
        return E_FAIL;

    Editor& editor = m_page->focusController().focusedOrMainFrame().editor();
    editor.deleteSelectionWithSmartDelete(editor.canSmartCopyOrDelete());
    return S_OK;
}

HRESULT WebView::clearSelection()
{
    if (!m_page)
        return E_FAIL;

    m_page->focusController().focusedOrMainFrame().selection().clear();
    return S_OK;
}
    
HRESULT WebView::applyStyle(_In_opt_ IDOMCSSStyleDeclaration* /*style*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

// IWebViewEditingActions ------------------------------------------------------

HRESULT WebView::copy(_In_opt_ IUnknown* /*sender*/)
{
    if (!m_page)
        return E_FAIL;

    m_page->focusController().focusedOrMainFrame().editor().command("Copy"_s).execute();
    return S_OK;
}

HRESULT WebView::cut(_In_opt_ IUnknown* /*sender*/)
{
    if (!m_page)
        return E_FAIL;

    m_page->focusController().focusedOrMainFrame().editor().command("Cut"_s).execute();
    return S_OK;
}

HRESULT WebView::paste(_In_opt_ IUnknown* /*sender*/)
{
    if (!m_page)
        return E_FAIL;

    m_page->focusController().focusedOrMainFrame().editor().command("Paste"_s).execute();
    return S_OK;
}

HRESULT WebView::copyURL(_In_ BSTR url)
{
    if (!m_page)
        return E_FAIL;

    m_page->focusController().focusedOrMainFrame().editor().copyURL(MarshallingHelpers::BSTRToKURL(url), emptyString());
    return S_OK;
}

HRESULT WebView::copyFont(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::pasteFont(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::delete_(_In_opt_ IUnknown* /*sender*/)
{
    if (!m_page)
        return E_FAIL;

    m_page->focusController().focusedOrMainFrame().editor().command("Delete"_s).execute();
    return S_OK;
}
    
HRESULT WebView::pasteAsPlainText(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::pasteAsRichText(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::changeFont(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::changeAttributes(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::changeDocumentBackgroundColor(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::changeColor(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::alignCenter(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::alignJustified(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::alignLeft(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::alignRight(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::checkSpelling(_In_opt_ IUnknown* /*sender*/)
{
    if (!m_editingDelegate) {
        LOG_ERROR("No NSSpellChecker");
        return E_FAIL;
    }
    
    core(m_mainFrame)->editor().advanceToNextMisspelling();
    return S_OK;
}
    
HRESULT WebView::showGuessPanel(_In_opt_ IUnknown* /*sender*/)
{
    if (!m_editingDelegate) {
        LOG_ERROR("No NSSpellChecker");
        return E_FAIL;
    }
    
    // Post-Tiger, this menu item is a show/hide toggle, to match AppKit. Leave Tiger behavior alone
    // to match rest of OS X.
    BOOL showing;
    if (SUCCEEDED(m_editingDelegate->spellingUIIsShowing(&showing)) && showing) {
        m_editingDelegate->showSpellingUI(FALSE);
    }
    
    core(m_mainFrame)->editor().advanceToNextMisspelling(true);
    m_editingDelegate->showSpellingUI(TRUE);
    return S_OK;
}
    
HRESULT WebView::performFindPanelAction(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::startSpeaking(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}
    
HRESULT WebView::stopSpeaking(_In_opt_ IUnknown* /*sender*/)
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

// IWebNotificationObserver -----------------------------------------------------------------

HRESULT WebView::onNotify(_In_opt_ IWebNotification* notification)
{
    if (!notification)
        return E_POINTER;

    BString name;
    HRESULT hr = notification->name(&name);
    if (FAILED(hr))
        return hr;

    if (!wcscmp(name, WebPreferences::webPreferencesChangedNotification()))
        return notifyPreferencesChanged(notification);

    return hr;
}

HRESULT WebView::notifyPreferencesChanged(IWebNotification* notification)
{
    if (!m_page)
        return E_FAIL;

    HRESULT hr;

    COMPtr<IUnknown> unkPrefs;
    hr = notification->getObject(&unkPrefs);
    if (FAILED(hr))
        return hr;

    COMPtr<IWebPreferences> preferences(Query, unkPrefs);
    if (!preferences)
        return E_NOINTERFACE;

    ASSERT(preferences == m_preferences);

    hr = preferencesChangedGenerated(*m_preferences);
    if (FAILED(hr))
        return hr;

    BString str;
    int size;
    unsigned javaScriptRuntimeFlags;
    BOOL enabled = FALSE;

    Settings& settings = m_page->settings();

    hr = preferences->cursiveFontFamily(&str);
    if (FAILED(hr))
        return hr;
    settings.setCursiveFontFamily(toAtomString(str));
    str.clear();

    hr = preferences->defaultFixedFontSize(&size);
    if (FAILED(hr))
        return hr;
    settings.setDefaultFixedFontSize(size);

    hr = preferences->defaultFontSize(&size);
    if (FAILED(hr))
        return hr;
    settings.setDefaultFontSize(size);

    hr = preferences->defaultTextEncodingName(&str);
    if (FAILED(hr))
        return hr;
    settings.setDefaultTextEncodingName(toString(str));
    str.clear();

    hr = preferences->fantasyFontFamily(&str);
    if (FAILED(hr))
        return hr;
    settings.setFantasyFontFamily(toAtomString(str));
    str.clear();

    hr = preferences->fixedFontFamily(&str);
    if (FAILED(hr))
        return hr;
    settings.setFixedFontFamily(toAtomString(str));
    str.clear();

#if ENABLE(VIDEO)
    hr = preferences->shouldDisplaySubtitles(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setShouldDisplaySubtitles(enabled);

    hr = preferences->shouldDisplayCaptions(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setShouldDisplayCaptions(enabled);

    hr = preferences->shouldDisplayTextDescriptions(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setShouldDisplayTextDescriptions(enabled);
#endif

    COMPtr<IWebPreferencesPrivate8> prefsPrivate { Query, preferences };
    if (prefsPrivate) {
        hr = prefsPrivate->localStorageDatabasePath(&str);
        if (FAILED(hr))
            return hr;
        settings.setLocalStorageDatabasePath(toString(str));
        str.clear();
    }

    hr = preferences->pictographFontFamily(&str);
    if (FAILED(hr))
        return hr;
    settings.setPictographFontFamily(toAtomString(str));
    str.clear();

    hr = preferences->isJavaScriptEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setScriptEnabled(!!enabled);

    hr = preferences->javaScriptCanOpenWindowsAutomatically(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setJavaScriptCanOpenWindowsAutomatically(!!enabled);

    hr = preferences->minimumFontSize(&size);
    if (FAILED(hr))
        return hr;
    settings.setMinimumFontSize(size);

    hr = preferences->minimumLogicalFontSize(&size);
    if (FAILED(hr))
        return hr;
    settings.setMinimumLogicalFontSize(size);

    hr = preferences->arePlugInsEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setPluginsEnabled(!!enabled);

    // FIXME: Add preferences for the runtime enabled features.

    hr = prefsPrivate->menuItemElementEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    RuntimeEnabledFeatures::sharedFeatures().setMenuItemElementEnabled(!!enabled);

    hr = prefsPrivate->webAnimationsCompositeOperationsEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setWebAnimationsCompositeOperationsEnabled(!!enabled);

    hr = prefsPrivate->webAnimationsMutableTimelinesEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setWebAnimationsMutableTimelinesEnabled(!!enabled);

    hr = prefsPrivate->CSSCustomPropertiesAndValuesEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setCSSCustomPropertiesAndValuesEnabled(!!enabled);

    hr = prefsPrivate->linkPreloadEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setLinkPreloadEnabled(!!enabled);

    hr = prefsPrivate->fetchAPIKeepAliveEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    RuntimeEnabledFeatures::sharedFeatures().setFetchAPIKeepAliveEnabled(!!enabled);

    hr = prefsPrivate->mediaPreloadingEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setMediaPreloadingEnabled(!!enabled);

    hr = prefsPrivate->dataTransferItemsEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setDataTransferItemsEnabled(!!enabled);

    hr = prefsPrivate->webSQLEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    RuntimeEnabledFeatures::sharedFeatures().setWebSQLEnabled(enabled);

    hr = prefsPrivate->visualViewportAPIEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setVisualViewportAPIEnabled(!!enabled);

    hr = prefsPrivate->CSSOMViewScrollingAPIEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setCSSOMViewScrollingAPIEnabled(!!enabled);

    hr = prefsPrivate->CSSOMViewSmoothScrollingEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setCSSOMViewSmoothScrollingEnabled(!!enabled);

    hr = prefsPrivate->CSSIndividualTransformPropertiesEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setCSSIndividualTransformPropertiesEnabled(!!enabled);

    hr = preferences->privateBrowsingEnabled(&enabled);
    if (FAILED(hr))
        return hr;
#if PLATFORM(WIN) || USE(CFURLCONNECTION)
    if (enabled)
        WebFrameNetworkingContext::ensurePrivateBrowsingSession();
    else
        WebFrameNetworkingContext::destroyPrivateBrowsingSession();
#endif
    m_page->setSessionID(!!enabled ? PAL::SessionID::legacyPrivateSessionID() : PAL::SessionID::defaultSessionID());
    m_page->setBroadcastChannelRegistry(WebBroadcastChannelRegistry::getOrCreate(!!enabled));

    hr = preferences->sansSerifFontFamily(&str);
    if (FAILED(hr))
        return hr;
    settings.setSansSerifFontFamily(toAtomString(str));
    str.clear();

    hr = preferences->serifFontFamily(&str);
    if (FAILED(hr))
        return hr;
    settings.setSerifFontFamily(toAtomString(str));
    str.clear();

    hr = preferences->standardFontFamily(&str);
    if (FAILED(hr))
        return hr;
    settings.setStandardFontFamily(toAtomString(str));
    str.clear();

    hr = preferences->loadsImagesAutomatically(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setLoadsImagesAutomatically(!!enabled);

    hr = preferences->userStyleSheetEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    if (enabled) {
        hr = preferences->userStyleSheetLocation(&str);
        if (FAILED(hr))
            return hr;

#if USE(CF)
        RetainPtr<CFURLRef> url = adoptCF(CFURLCreateWithString(kCFAllocatorDefault, toString(str).createCFString().get(), 0));

        // Check if the passed in string is a path and convert it to a URL.
        // FIXME: This is a workaround for nightly builds until we can get Safari to pass 
        // in an URL here. See <rdar://problem/5478378>
        if (!url) {
            DWORD len = SysStringLen(str) + 1;

            int result = WideCharToMultiByte(CP_UTF8, 0, str, len, 0, 0, 0, 0);
            Vector<UInt8> utf8Path(result);
            if (!WideCharToMultiByte(CP_UTF8, 0, str, len, (LPSTR)utf8Path.data(), result, 0, 0))
                return E_FAIL;

            url = adoptCF(CFURLCreateFromFileSystemRepresentation(0, utf8Path.data(), result - 1, false));
        }

        settings.setUserStyleSheetLocation(url.get());
#else
        ASSERT(0);
#endif
        str.clear();
    } else
        settings.setUserStyleSheetLocation(URL());

    hr = preferences->shouldPrintBackgrounds(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setShouldPrintBackgrounds(!!enabled);

    hr = preferences->textAreasAreResizable(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setTextAreasAreResizable(!!enabled);

    WebKitEditableLinkBehavior behavior;
    hr = preferences->editableLinkBehavior(&behavior);
    if (FAILED(hr))
        return hr;
    settings.setEditableLinkBehavior((EditableLinkBehavior)behavior);

    hr = preferences->usesPageCache(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setUsesBackForwardCache(!!enabled);

    hr = preferences->isDOMPasteAllowed(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setDOMPasteAllowed(!!enabled);

    hr = preferences->zoomsTextOnly(&enabled);
    if (FAILED(hr))
        return hr;

    if (m_zoomsTextOnly != !!enabled)
        setZoomMultiplier(m_zoomMultiplier, enabled);

    settings.setShowsURLsInToolTips(false);

    settings.setForceFTPDirectoryListings(true);
    settings.setDeveloperExtrasEnabled(developerExtrasEnabled());
    settings.setNeedsSiteSpecificQuirks(s_allowSiteSpecificHacks);

    FontSmoothingType smoothingType;
    hr = preferences->fontSmoothing(&smoothingType);
    if (FAILED(hr))
        return hr;
    settings.setFontRenderingMode(smoothingType != FontSmoothingTypeWindows ? FontRenderingMode::Normal : FontRenderingMode::Alternate);

#if USE(AVFOUNDATION)
    hr = preferences->avFoundationEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    DeprecatedGlobalSettings::setAVFoundationEnabled(enabled);
#endif

    if (prefsPrivate) {
        hr = prefsPrivate->authorAndUserStylesEnabled(&enabled);
        if (FAILED(hr))
            return hr;
        settings.setAuthorAndUserStylesEnabled(enabled);
    }

    hr = prefsPrivate->offlineWebApplicationCacheEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setOfflineWebApplicationCacheEnabled(enabled);

    hr = prefsPrivate->databasesEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    DatabaseManager::singleton().setIsAvailable(enabled);

    hr = prefsPrivate->localStorageEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setLocalStorageEnabled(enabled);

    hr = prefsPrivate->isWebSecurityEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setWebSecurityEnabled(!!enabled);

    hr = prefsPrivate->allowTopNavigationToDataURLs(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setAllowTopNavigationToDataURLs(!!enabled);

    hr = prefsPrivate->allowUniversalAccessFromFileURLs(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setAllowUniversalAccessFromFileURLs(!!enabled);

    hr = prefsPrivate->allowFileAccessFromFileURLs(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setAllowFileAccessFromFileURLs(!!enabled);

    hr = prefsPrivate->javaScriptCanAccessClipboard(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setJavaScriptCanAccessClipboard(!!enabled);

    hr = prefsPrivate->shouldUseHighResolutionTimers(&enabled);
    if (FAILED(hr))
        return hr;
    DeprecatedGlobalSettings::setShouldUseHighResolutionTimers(enabled);

    hr = prefsPrivate->isFrameFlatteningEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setFrameFlattening(enabled ? FrameFlattening::FullyEnabled : FrameFlattening::Disabled);

    hr = prefsPrivate->acceleratedCompositingEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setAcceleratedCompositingEnabled(enabled);

    hr = prefsPrivate->showDebugBorders(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setShowDebugBorders(enabled);

    hr = prefsPrivate->showRepaintCounter(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setShowRepaintCounter(enabled);

    hr = prefsPrivate->showTiledScrollingIndicator(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setShowTiledScrollingIndicator(!!enabled);

#if ENABLE(WEB_AUDIO)
    settings.setWebAudioEnabled(true);
#endif // ENABLE(WEB_AUDIO)

#if ENABLE(WEBGL)
    settings.setWebGLEnabled(true);
#endif // ENABLE(WEBGL)

    hr = prefsPrivate->spatialNavigationEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setSpatialNavigationEnabled(!!enabled);

    hr = prefsPrivate->isDNSPrefetchingEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setDNSPrefetchingEnabled(enabled);

    hr = prefsPrivate->hyperlinkAuditingEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setHyperlinkAuditingEnabled(enabled);

    hr = prefsPrivate->loadsSiteIconsIgnoringImageLoadingPreference(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setLoadsSiteIconsIgnoringImageLoadingSetting(!!enabled);

    hr = prefsPrivate->showsToolTipOverTruncatedText(&enabled);
    if (FAILED(hr))
        return hr;

    settings.setShowsToolTipOverTruncatedText(enabled);

    m_mainFrame->invalidate(); // FIXME

    hr = updateSharedSettingsFromPreferencesIfNeeded(preferences.get());
    if (FAILED(hr))
        return hr;

#if ENABLE(FULLSCREEN_API)
    hr = prefsPrivate->isFullScreenEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setFullScreenEnabled(enabled);
#endif

    hr = prefsPrivate->mediaPlaybackRequiresUserGesture(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setVideoPlaybackRequiresUserGesture(enabled);
    settings.setAudioPlaybackRequiresUserGesture(enabled);

    hr = prefsPrivate->mediaPlaybackAllowsInline(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setAllowsInlineMediaPlayback(enabled);

    hr = prefsPrivate->shouldInvertColors(&enabled);
    if (FAILED(hr))
        return hr;
    setShouldInvertColors(enabled);

    hr = prefsPrivate->mockScrollbarsEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    DeprecatedGlobalSettings::setMockScrollbarsEnabled(enabled);

    hr = prefsPrivate->isInheritURIQueryComponentEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setEnableInheritURIQueryComponent(enabled);

    hr = prefsPrivate->allowDisplayAndRunningOfInsecureContent(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setAllowDisplayOfInsecureContent(!!enabled);
    settings.setAllowRunningOfInsecureContent(!!enabled);

    hr = prefsPrivate->javaScriptRuntimeFlags(&javaScriptRuntimeFlags);
    if (FAILED(hr))
        return hr;
    settings.setJavaScriptRuntimeFlags(JSC::RuntimeFlags(javaScriptRuntimeFlags));

    hr = prefsPrivate->serverTimingEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    RuntimeEnabledFeatures::sharedFeatures().setServerTimingEnabled(!!enabled);

    hr = prefsPrivate->resizeObserverEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setResizeObserverEnabled(!!enabled);

    hr = prefsPrivate->coreMathMLEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setCoreMathMLEnabled(!!enabled);

    hr = prefsPrivate->requestIdleCallbackEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setRequestIdleCallbackEnabled(!!enabled);

    hr = prefsPrivate->asyncClipboardAPIEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setAsyncClipboardAPIEnabled(!!enabled);

    hr = prefsPrivate->contactPickerAPIEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setContactPickerAPIEnabled(!!enabled);

    hr = prefsPrivate->aspectRatioOfImgFromWidthAndHeightEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setAspectRatioOfImgFromWidthAndHeightEnabled(!!enabled);

    hr = prefsPrivate->speechRecognitionEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setSpeechRecognitionEnabled(!!enabled);

    hr = prefsPrivate->overscrollBehaviorEnabled(&enabled);
    if (FAILED(hr))
        return hr;
    settings.setOverscrollBehaviorEnabled(!!enabled);

    settings.setCanvasColorSpaceEnabled(m_preferences->canvasColorSpaceEnabled());
    settings.setCSSGradientInterpolationColorSpacesEnabled(m_preferences->cssGradientInterpolationColorSpacesEnabled());
    settings.setCSSGradientPremultipliedAlphaInterpolationEnabled(m_preferences->cssGradientPremultipliedAlphaInterpolationEnabled());
    settings.setMockScrollbarsControllerEnabled(m_preferences->mockScrollbarsControllerEnabled());
    settings.setCSSInputSecurityEnabled(m_preferences->cssInputSecurityEnabled());
    settings.setCSSTextAlignLastEnabled(m_preferences->cssTextAlignLastEnabled());
    settings.setCSSTextJustifyEnabled(m_preferences->cssTextJustifyEnabled());

    return S_OK;
}

HRESULT updateSharedSettingsFromPreferencesIfNeeded(IWebPreferences* preferences)
{
    if (preferences != WebPreferences::sharedStandardPreferences())
        return S_OK;

    WebKitCookieStorageAcceptPolicy acceptPolicy;
    HRESULT hr = preferences->cookieStorageAcceptPolicy(&acceptPolicy);
    if (FAILED(hr))
        return hr;

#if USE(CFURLCONNECTION)
    WebFrameNetworkingContext::setCookieAcceptPolicyForAllContexts(acceptPolicy);
#endif

    return S_OK;
}

// IWebViewPrivate ------------------------------------------------------------

HRESULT WebView::MIMETypeForExtension(_In_ BSTR extension, _Deref_opt_out_ BSTR* mimeType)
{
    if (!mimeType)
        return E_POINTER;

    *mimeType = BString(MIMETypeRegistry::mimeTypeForExtension(toString(extension))).release();

    return S_OK;
}

HRESULT WebView::setCustomDropTarget(_In_opt_ IDropTarget* dt)
{
    ASSERT(::IsWindow(m_viewWindow));
    if (!dt)
        return E_POINTER;
    m_hasCustomDropTarget = true;
    revokeDragDrop();
    return ::RegisterDragDrop(m_viewWindow,dt);
}

HRESULT WebView::removeCustomDropTarget()
{
    if (!m_hasCustomDropTarget)
        return S_OK;
    m_hasCustomDropTarget = false;
    revokeDragDrop();
    return registerDragDrop();
}

HRESULT WebView::setInViewSourceMode(BOOL)
{
    return E_NOTIMPL;
}
    
HRESULT WebView::inViewSourceMode(_Out_ BOOL*)
{
    return E_NOTIMPL;
}

HRESULT WebView::viewWindow(_Deref_opt_out_ HWND* window)
{
    if (!window)
        return E_POINTER;

    *window = m_viewWindow;
    return S_OK;
}

HRESULT WebView::setFormDelegate(_In_opt_ IWebFormDelegate* formDelegate)
{
    m_formDelegate = formDelegate;
    return S_OK;
}

HRESULT WebView::formDelegate(_COM_Outptr_opt_ IWebFormDelegate** formDelegate)
{
    if (!formDelegate)
        return E_POINTER;
    *formDelegate = nullptr;
    if (!m_formDelegate)
        return E_FAIL;

    return m_formDelegate.copyRefTo(formDelegate);
}

HRESULT WebView::setFrameLoadDelegatePrivate(_In_opt_ IWebFrameLoadDelegatePrivate* d)
{
    if (m_frameLoadDelegatePrivate == d)
        return S_OK;

    static BSTR webViewProgressFinishedNotificationName = SysAllocString(WebViewProgressFinishedNotification);

    IWebNotificationCenter* notifyCenter = WebNotificationCenter::defaultCenterInternal();

    COMPtr<IWebNotificationObserver> wasObserver(Query, m_frameLoadDelegatePrivate);
    if (wasObserver)
        notifyCenter->removeObserver(wasObserver.get(), webViewProgressFinishedNotificationName, nullptr);

    m_frameLoadDelegatePrivate = d;

    COMPtr<IWebNotificationObserver> isObserver(Query, m_frameLoadDelegatePrivate);
    if (isObserver)
        notifyCenter->addObserver(isObserver.get(), webViewProgressFinishedNotificationName, nullptr);

    return S_OK;
}

HRESULT WebView::frameLoadDelegatePrivate(_COM_Outptr_opt_ IWebFrameLoadDelegatePrivate** d)
{
    if (!d)
        return E_POINTER;
    *d = nullptr;
    if (!m_frameLoadDelegatePrivate)
        return E_FAIL;
        
    return m_frameLoadDelegatePrivate.copyRefTo(d);
}

HRESULT WebView::scrollOffset(_Out_ LPPOINT offset)
{
    if (!offset)
        return E_POINTER;

    if (!m_page || !m_page->mainFrame().view())
        return E_FAIL;

    IntPoint scrollPosition = m_page->mainFrame().view()->scrollPosition();
    float scaleFactor = deviceScaleFactor();
    scrollPosition.scale(scaleFactor, scaleFactor);

    offset->x = scrollPosition.x();
    offset->y = scrollPosition.y();
    return S_OK;
}

HRESULT WebView::scrollBy(_In_ LPPOINT offset)
{
    if (!offset)
        return E_POINTER;

    if (!m_page || !m_page->mainFrame().view())
        return E_FAIL;

    IntSize scrollDelta(offset->x, offset->y);
    scrollDelta.scale(1.0f / deviceScaleFactor());
    m_page->mainFrame().view()->scrollBy(scrollDelta);
    return S_OK;
}

HRESULT WebView::visibleContentRect(_Out_ LPRECT rect)
{
    if (!rect)
        return E_POINTER;

    if (!m_page || !m_page->mainFrame().view())
        return E_FAIL;

    FloatRect visibleContent = m_page->mainFrame().view()->visibleContentRect();
    visibleContent.scale(deviceScaleFactor());
    rect->left = (LONG) visibleContent.x();
    rect->top = (LONG) visibleContent.y();
    rect->right = (LONG) visibleContent.maxX();
    rect->bottom = (LONG) visibleContent.maxY();
    return S_OK;
}

static DWORD dragOperationToDragCursor(std::optional<DragOperation> operation)
{
    if (!operation)
        return DROPEFFECT_NONE;

    DWORD result = DROPEFFECT_NONE;
    if (*operation == DragOperation::Copy)
        result = DROPEFFECT_COPY;
    else if (*operation == DragOperation::Link)
        result = DROPEFFECT_LINK;
    else if (*operation == DragOperation::Move)
        result = DROPEFFECT_MOVE;
    else if (*operation == DragOperation::Generic)
        result = DROPEFFECT_MOVE; // This appears to be the Firefox behaviour.
    return result;
}

OptionSet<DragOperation> WebView::keyStateToDragOperation(DWORD grfKeyState) const
{
    if (!m_page)
        return { };

    // Conforms to Microsoft's key combinations as documented for 
    // IDropTarget::DragOver. Note, grfKeyState is the current 
    // state of the keyboard modifier keys on the keyboard. See:
    // <http://msdn.microsoft.com/en-us/library/ms680129(VS.85).aspx>.
    auto operationMask = m_page->dragController().sourceDragOperationMask();

    if ((grfKeyState & (MK_CONTROL | MK_SHIFT)) == (MK_CONTROL | MK_SHIFT))
        operationMask = { DragOperation::Link };
    else if ((grfKeyState & MK_CONTROL) == MK_CONTROL)
        operationMask = { DragOperation::Copy };
    else if ((grfKeyState & MK_SHIFT) == MK_SHIFT)
        operationMask = { DragOperation::Generic };

    return operationMask;
}

HRESULT WebView::DragEnter(IDataObject* pDataObject, DWORD grfKeyState, POINTL pt, DWORD* pdwEffect)
{
    m_dragData = nullptr;

    if (m_dropTargetHelper)
        m_dropTargetHelper->DragEnter(m_viewWindow, pDataObject, (POINT*)&pt, *pdwEffect);

    POINTL localpt = pt;
    ::ScreenToClient(m_viewWindow, (LPPOINT)&localpt);
    DragData data(pDataObject, IntPoint(localpt.x, localpt.y), 
        IntPoint(pt.x, pt.y), keyStateToDragOperation(grfKeyState));
    *pdwEffect = dragOperationToDragCursor(m_page->dragController().dragEntered(data));

    m_lastDropEffect = *pdwEffect;
    m_dragData = pDataObject;

    return S_OK;
}

HRESULT WebView::DragOver(DWORD grfKeyState, POINTL pt, DWORD* pdwEffect)
{
    if (m_dropTargetHelper)
        m_dropTargetHelper->DragOver((POINT*)&pt, *pdwEffect);

    if (m_dragData) {
        POINTL localpt = pt;
        ::ScreenToClient(m_viewWindow, (LPPOINT)&localpt);
        DragData data(m_dragData.get(), IntPoint(localpt.x, localpt.y), 
            IntPoint(pt.x, pt.y), keyStateToDragOperation(grfKeyState));
        *pdwEffect = dragOperationToDragCursor(m_page->dragController().dragUpdated(data));
    } else
        *pdwEffect = DROPEFFECT_NONE;

    m_lastDropEffect = *pdwEffect;
    return S_OK;
}

HRESULT WebView::DragLeave()
{
    if (m_dropTargetHelper)
        m_dropTargetHelper->DragLeave();

    if (m_dragData) {
        DragData data(m_dragData.get(), IntPoint(), IntPoint(), { });
        m_page->dragController().dragExited(data);
        m_dragData = 0;
    }
    return S_OK;
}

HRESULT WebView::Drop(IDataObject* pDataObject, DWORD grfKeyState, POINTL pt, DWORD* pdwEffect)
{
    if (m_dropTargetHelper)
        m_dropTargetHelper->Drop(pDataObject, (POINT*)&pt, *pdwEffect);

    m_dragData = 0;
    *pdwEffect = m_lastDropEffect;
    POINTL localpt = pt;
    ::ScreenToClient(m_viewWindow, (LPPOINT)&localpt);
    DragData data(pDataObject, IntPoint(localpt.x, localpt.y), 
        IntPoint(pt.x, pt.y), keyStateToDragOperation(grfKeyState));
    m_page->dragController().performDragOperation(data);
    return S_OK;
}

HRESULT WebView::canHandleRequest(_In_opt_ IWebURLRequest* request, _Out_ BOOL* result)
{
    if (!result)
        return E_POINTER;

    *result = FALSE;

    if (!request)
        return S_OK;

    COMPtr<WebMutableURLRequest> requestImpl;

    HRESULT hr = request->QueryInterface(&requestImpl);
    if (FAILED(hr))
        return hr;

    *result = !!canHandleRequest(requestImpl->resourceRequest());
    return S_OK;
}

HRESULT WebView::standardUserAgentWithApplicationName(_In_ BSTR applicationName, _Deref_opt_out_ BSTR* groupName)
{
    if (!groupName) {
        ASSERT_NOT_REACHED();
        return E_POINTER;
    }

    if (!applicationName) {
        ASSERT_NOT_REACHED();
        return E_POINTER;
    }

    *groupName = BString(standardUserAgentWithApplicationName(toString(applicationName))).release();
    return S_OK;
}

HRESULT WebView::clearFocusNode()
{
    if (m_page)
        m_page->focusController().setFocusedElement(nullptr, m_page->focusController().focusedOrMainFrame());
    return S_OK;
}

HRESULT WebView::setInitialFocus(BOOL forward)
{
    if (m_page) {
        Frame& frame = m_page->focusController().focusedOrMainFrame();
        frame.document()->setFocusedElement(0);
        m_page->focusController().setInitialFocus(forward ? FocusDirection::Forward : FocusDirection::Backward, 0);
    }
    return S_OK;
}

HRESULT WebView::setTabKeyCyclesThroughElements(BOOL cycles)
{
    if (m_page)
        m_page->setTabKeyCyclesThroughElements(!!cycles);

    return S_OK;
}

HRESULT WebView::tabKeyCyclesThroughElements(_Out_ BOOL* result)
{
    if (!result) {
        ASSERT_NOT_REACHED();
        return E_POINTER;
    }

    *result = m_page && m_page->tabKeyCyclesThroughElements() ? TRUE : FALSE;
    return S_OK;
}

HRESULT WebView::setAllowSiteSpecificHacks(BOOL allow)
{
    s_allowSiteSpecificHacks = !!allow;
    // FIXME: This sets a global so it needs to call notifyPreferencesChanged
    // on all WebView objects (not just itself).
    return S_OK;
}

HRESULT WebView::addAdditionalPluginDirectory(_In_ BSTR)
{
    return S_OK;
}

HRESULT WebView::loadBackForwardListFromOtherView(_In_opt_ IWebView* otherView)
{
    if (!m_page)
        return E_FAIL;

    if (!otherView)
        return S_OK;

    // It turns out the right combination of behavior is done with the back/forward load
    // type.  (See behavior matrix at the top of WebFramePrivate.)  So we copy all the items
    // in the back forward list, and go to the current one.
    BackForwardController& backForward = m_page->backForward();
    ASSERT(!backForward.currentItem()); // destination list should be empty

    COMPtr<WebView> otherWebView;
    if (FAILED(otherView->QueryInterface(&otherWebView)))
        return E_FAIL;
    BackForwardController& otherBackForward = otherWebView->m_page->backForward();
    if (!otherBackForward.currentItem())
        return S_OK; // empty back forward list, bail
    
    HistoryItem* newItemToGoTo = 0;

    int lastItemIndex = otherBackForward.forwardCount();
    for (int i = -otherBackForward.backCount(); i <= lastItemIndex; ++i) {
        if (!i) {
            // If this item is showing , save away its current scroll and form state,
            // since that might have changed since loading and it is normally not saved
            // until we leave that page.
            otherWebView->m_page->mainFrame().loader().history().saveDocumentAndScrollState();
        }
        Ref<HistoryItem> newItem = otherBackForward.itemAtIndex(i)->copy();
        if (!i) 
            newItemToGoTo = newItem.ptr();
        backForward.client().addItem(WTFMove(newItem));
    }
    
    ASSERT(newItemToGoTo);
    m_page->goToItem(*newItemToGoTo, FrameLoadType::IndexedBackForward, ShouldTreatAsContinuingLoad::No);
    return S_OK;
}

HRESULT WebView::clearUndoRedoOperations()
{
    if (!m_page)
        return S_OK;

    Frame& frame = m_page->focusController().focusedOrMainFrame();
    frame.editor().clearUndoRedoOperations();
    return S_OK;
}

HRESULT WebView::shouldClose(_Out_ BOOL* result)
{
    if (!result) {
        ASSERT_NOT_REACHED();
        return E_POINTER;
    }

    *result = FALSE;

    if (!m_page)
        return S_OK;

    *result = m_page->mainFrame().loader().shouldClose();
    return S_OK;
}

HRESULT WebView::registerDragDrop()
{
    ASSERT(::IsWindow(m_viewWindow));
    return ::RegisterDragDrop(m_viewWindow, this);
}

HRESULT WebView::revokeDragDrop()
{
    if (!m_viewWindow)
        return S_OK;

    return ::RevokeDragDrop(m_viewWindow);
}

HRESULT WebView::setProhibitsMainFrameScrolling(BOOL b)
{
    if (!m_page)
        return E_FAIL;

    m_page->mainFrame().view()->setProhibitsScrolling(b);
    return S_OK;
}

HRESULT WebView::setShouldApplyMacFontAscentHack(BOOL b)
{
    WebCore::Font::setShouldApplyMacAscentHack(b);
    return S_OK;
}

class IMMDict {
    typedef HIMC (CALLBACK *getContextPtr)(HWND);
    typedef BOOL (CALLBACK *releaseContextPtr)(HWND, HIMC);
    typedef LONG (CALLBACK *getCompositionStringPtr)(HIMC, DWORD, LPVOID, DWORD);
    typedef BOOL (CALLBACK *setCandidateWindowPtr)(HIMC, LPCANDIDATEFORM);
    typedef BOOL (CALLBACK *setOpenStatusPtr)(HIMC, BOOL);
    typedef BOOL (CALLBACK *notifyIMEPtr)(HIMC, DWORD, DWORD, DWORD);
    typedef BOOL (CALLBACK *associateContextExPtr)(HWND, HIMC, DWORD);

public:
    getContextPtr getContext;
    releaseContextPtr releaseContext;
    getCompositionStringPtr getCompositionString;
    setCandidateWindowPtr setCandidateWindow;
    setOpenStatusPtr setOpenStatus;
    notifyIMEPtr notifyIME;
    associateContextExPtr associateContextEx;

    static const IMMDict& dict();
private:
    IMMDict();
    HMODULE m_instance;
};

const IMMDict& IMMDict::dict()
{
    static IMMDict instance;
    return instance;
}

IMMDict::IMMDict()
{
    m_instance = ::LoadLibraryW(L"IMM32.DLL");
    getContext = reinterpret_cast<getContextPtr>(::GetProcAddress(m_instance, "ImmGetContext"));
    ASSERT(getContext);
    releaseContext = reinterpret_cast<releaseContextPtr>(::GetProcAddress(m_instance, "ImmReleaseContext"));
    ASSERT(releaseContext);
    getCompositionString = reinterpret_cast<getCompositionStringPtr>(::GetProcAddress(m_instance, "ImmGetCompositionStringW"));
    ASSERT(getCompositionString);
    setCandidateWindow = reinterpret_cast<setCandidateWindowPtr>(::GetProcAddress(m_instance, "ImmSetCandidateWindow"));
    ASSERT(setCandidateWindow);
    setOpenStatus = reinterpret_cast<setOpenStatusPtr>(::GetProcAddress(m_instance, "ImmSetOpenStatus"));
    ASSERT(setOpenStatus);
    notifyIME = reinterpret_cast<notifyIMEPtr>(::GetProcAddress(m_instance, "ImmNotifyIME"));
    ASSERT(notifyIME);
    associateContextEx = reinterpret_cast<associateContextExPtr>(::GetProcAddress(m_instance, "ImmAssociateContextEx"));
    ASSERT(associateContextEx);
}

HIMC WebView::getIMMContext() 
{
    HIMC context = IMMDict::dict().getContext(m_viewWindow);
    return context;
}

void WebView::releaseIMMContext(HIMC hIMC)
{
    if (!hIMC)
        return;
    IMMDict::dict().releaseContext(m_viewWindow, hIMC);
}

void WebView::prepareCandidateWindow(Frame* targetFrame, HIMC hInputContext) 
{
    IntRect caret;
    if (auto range = targetFrame->selection().selection().toNormalizedRange())
        caret = targetFrame->editor().firstRectForRange(*range);
    caret = targetFrame->view()->contentsToWindow(caret);
    caret.scale(deviceScaleFactor());

    CANDIDATEFORM form;
    form.dwIndex = 0;
    form.dwStyle = CFS_EXCLUDE;
    form.ptCurrentPos.x = caret.x();
    form.ptCurrentPos.y = caret.y() + caret.height();
    form.rcArea.top = caret.y();
    form.rcArea.bottom = caret.maxY();
    form.rcArea.left = caret.x();
    form.rcArea.right = caret.maxX();
    IMMDict::dict().setCandidateWindow(hInputContext, &form);
}

void WebView::resetIME(Frame* targetFrame)
{
    if (targetFrame)
        targetFrame->editor().cancelComposition();

    if (HIMC hInputContext = getIMMContext()) {
        IMMDict::dict().notifyIME(hInputContext, NI_COMPOSITIONSTR, CPS_CANCEL, 0);
        releaseIMMContext(hInputContext);
    }
}

void WebView::updateSelectionForIME()
{
    Frame& targetFrame = m_page->focusController().focusedOrMainFrame();
    if (targetFrame.editor().cancelCompositionIfSelectionIsInvalid())
        resetIME(&targetFrame);
}

void WebView::setInputMethodState(bool enabled)
{
    IMMDict::dict().associateContextEx(m_viewWindow, 0, enabled ? IACE_DEFAULT : 0);
}

void WebView::selectionChanged()
{
    updateSelectionForIME();
}

bool WebView::onIMEStartComposition()
{
    LOG(TextInput, "onIMEStartComposition");
    m_inIMEComposition++;
    Frame& targetFrame = m_page->focusController().focusedOrMainFrame();

    HIMC hInputContext = getIMMContext();
    prepareCandidateWindow(&targetFrame, hInputContext);
    releaseIMMContext(hInputContext);
    return true;
}

static bool getCompositionString(HIMC hInputContext, DWORD type, String& result)
{
    int compositionLength = IMMDict::dict().getCompositionString(hInputContext, type, 0, 0);
    if (compositionLength <= 0)
        return false;
    Vector<UChar> compositionBuffer(compositionLength / 2);
    compositionLength = IMMDict::dict().getCompositionString(hInputContext, type, (LPVOID)compositionBuffer.data(), compositionLength);
    result = String(compositionBuffer.data(), compositionLength / 2);
    ASSERT(!compositionLength || compositionBuffer[0]);
    ASSERT(!compositionLength || compositionBuffer[compositionLength / 2 - 1]);
    return true;
}

static void compositionToUnderlines(const Vector<DWORD>& clauses, const Vector<BYTE>& attributes, Vector<CompositionUnderline>& underlines)
{
    if (clauses.isEmpty()) {
        underlines.clear();
        return;
    }
  
    const size_t numBoundaries = clauses.size() - 1;
    underlines.resize(numBoundaries);
    for (unsigned i = 0; i < numBoundaries; i++) {
        underlines[i].startOffset = clauses[i];
        underlines[i].endOffset = clauses[i + 1];
        BYTE attribute = attributes[clauses[i]];
        underlines[i].thick = attribute == ATTR_TARGET_CONVERTED || attribute == ATTR_TARGET_NOTCONVERTED;
        underlines[i].color = Color::black;
    }
}

#if !LOG_DISABLED
#define APPEND_ARGUMENT_NAME(name) \
    if (lparam & name) { \
        if (needsComma) \
            result.append(", "); \
        result.append(#name); \
        needsComma = true; \
    }

static String imeCompositionArgumentNames(LPARAM lparam)
{
    StringBuilder result;
    bool needsComma = false;

    APPEND_ARGUMENT_NAME(GCS_COMPATTR);
    APPEND_ARGUMENT_NAME(GCS_COMPCLAUSE);
    APPEND_ARGUMENT_NAME(GCS_COMPREADSTR);
    APPEND_ARGUMENT_NAME(GCS_COMPREADATTR);
    APPEND_ARGUMENT_NAME(GCS_COMPREADCLAUSE);
    APPEND_ARGUMENT_NAME(GCS_COMPSTR);
    APPEND_ARGUMENT_NAME(GCS_CURSORPOS);
    APPEND_ARGUMENT_NAME(GCS_DELTASTART);
    APPEND_ARGUMENT_NAME(GCS_RESULTCLAUSE);
    APPEND_ARGUMENT_NAME(GCS_RESULTREADCLAUSE);
    APPEND_ARGUMENT_NAME(GCS_RESULTREADSTR);
    APPEND_ARGUMENT_NAME(GCS_RESULTSTR);
    APPEND_ARGUMENT_NAME(CS_INSERTCHAR);
    APPEND_ARGUMENT_NAME(CS_NOMOVECARET);

    return result.toString();
}

static String imeNotificationName(WPARAM wparam)
{
    switch (wparam) {
    case IMN_CHANGECANDIDATE:
        return "IMN_CHANGECANDIDATE"_s;
    case IMN_CLOSECANDIDATE:
        return "IMN_CLOSECANDIDATE"_s;
    case IMN_CLOSESTATUSWINDOW:
        return "IMN_CLOSESTATUSWINDOW"_s;
    case IMN_GUIDELINE:
        return "IMN_GUIDELINE"_s;
    case IMN_OPENCANDIDATE:
        return "IMN_OPENCANDIDATE"_s;
    case IMN_OPENSTATUSWINDOW:
        return "IMN_OPENSTATUSWINDOW"_s;
    case IMN_SETCANDIDATEPOS:
        return "IMN_SETCANDIDATEPOS"_s;
    case IMN_SETCOMPOSITIONFONT:
        return "IMN_SETCOMPOSITIONFONT"_s;
    case IMN_SETCOMPOSITIONWINDOW:
        return "IMN_SETCOMPOSITIONWINDOW"_s;
    case IMN_SETCONVERSIONMODE:
        return "IMN_SETCONVERSIONMODE"_s;
    case IMN_SETOPENSTATUS:
        return "IMN_SETOPENSTATUS"_s;
    case IMN_SETSENTENCEMODE:
        return "IMN_SETSENTENCEMODE"_s;
    case IMN_SETSTATUSWINDOWPOS:
        return "IMN_SETSTATUSWINDOWPOS"_s;
    default:
        return "Unknown (" + String::number(wparam) + ")";
    }
}

static String imeRequestName(WPARAM wparam)
{
    switch (wparam) {
    case IMR_CANDIDATEWINDOW:
        return "IMR_CANDIDATEWINDOW"_s;
    case IMR_COMPOSITIONFONT:
        return "IMR_COMPOSITIONFONT"_s;
    case IMR_COMPOSITIONWINDOW:
        return "IMR_COMPOSITIONWINDOW"_s;
    case IMR_CONFIRMRECONVERTSTRING:
        return "IMR_CONFIRMRECONVERTSTRING"_s;
    case IMR_DOCUMENTFEED:
        return "IMR_DOCUMENTFEED"_s;
    case IMR_QUERYCHARPOSITION:
        return "IMR_QUERYCHARPOSITION"_s;
    case IMR_RECONVERTSTRING:
        return "IMR_RECONVERTSTRING"_s;
    default:
        return "Unknown (" + String::number(wparam) + ")";
    }
}
#endif

bool WebView::onIMEComposition(LPARAM lparam)
{
    LOG(TextInput, "onIMEComposition %s", imeCompositionArgumentNames(lparam).latin1().data());
    HIMC hInputContext = getIMMContext();
    if (!hInputContext)
        return true;

    Frame& targetFrame = m_page->focusController().focusedOrMainFrame();
    if (!targetFrame.editor().canEdit())
        return true;

    prepareCandidateWindow(&targetFrame, hInputContext);

    if (lparam & GCS_RESULTSTR || !lparam) {
        String compositionString;
        if (!getCompositionString(hInputContext, GCS_RESULTSTR, compositionString) && lparam)
            return true;
        
        targetFrame.editor().confirmComposition(compositionString);
    } else {
        String compositionString;
        if (!getCompositionString(hInputContext, GCS_COMPSTR, compositionString))
            return true;
        
        // Composition string attributes
        int numAttributes = IMMDict::dict().getCompositionString(hInputContext, GCS_COMPATTR, 0, 0);
        Vector<BYTE> attributes(numAttributes);
        IMMDict::dict().getCompositionString(hInputContext, GCS_COMPATTR, attributes.data(), numAttributes);

        // Get clauses
        int numClauses = IMMDict::dict().getCompositionString(hInputContext, GCS_COMPCLAUSE, 0, 0);
        Vector<DWORD> clauses(numClauses / sizeof(DWORD));
        IMMDict::dict().getCompositionString(hInputContext, GCS_COMPCLAUSE, clauses.data(), numClauses);

        Vector<CompositionUnderline> underlines;
        compositionToUnderlines(clauses, attributes, underlines);

        int cursorPosition = LOWORD(IMMDict::dict().getCompositionString(hInputContext, GCS_CURSORPOS, 0, 0));

        targetFrame.editor().setComposition(compositionString, underlines, { }, cursorPosition, 0);
    }

    return true;
}

bool WebView::onIMEEndComposition()
{
    LOG(TextInput, "onIMEEndComposition");
    // If the composition hasn't been confirmed yet, it needs to be cancelled.
    // This happens after deleting the last character from inline input hole.
    Frame& targetFrame = m_page->focusController().focusedOrMainFrame();
    if (targetFrame.editor().hasComposition())
        targetFrame.editor().confirmComposition(String());

    if (m_inIMEComposition)
        m_inIMEComposition--;

    return true;
}

bool WebView::onIMEChar(WPARAM wparam, LPARAM lparam)
{
    UNUSED_PARAM(wparam);
    UNUSED_PARAM(lparam);
    LOG(TextInput, "onIMEChar U+%04X %08X", wparam, lparam);
    return true;
}

bool WebView::onIMENotify(WPARAM wparam, LPARAM, LRESULT*)
{
    UNUSED_PARAM(wparam);
    LOG(TextInput, "onIMENotify %s", imeNotificationName(wparam).latin1().data());
    return false;
}

LRESULT WebView::onIMERequestCharPosition(Frame* targetFrame, IMECHARPOSITION* charPos)
{
    if (charPos->dwCharPos && !targetFrame->editor().hasComposition())
        return 0;
    IntRect caret;
    std::optional<SimpleRange> range;
    if (targetFrame->editor().hasComposition())
        range = targetFrame->editor().compositionRange();
    else
        range = targetFrame->selection().selection().toNormalizedRange();
    if (range) {
        range->start.offset += charPos->dwCharPos;
        caret = targetFrame->editor().firstRectForRange(*range);
    }
    caret = targetFrame->view()->contentsToWindow(caret);
    caret.scale(deviceScaleFactor());
    charPos->pt.x = caret.x();
    charPos->pt.y = caret.y();
    ::ClientToScreen(m_viewWindow, &charPos->pt);
    charPos->cLineHeight = caret.height();
    ::GetWindowRect(m_viewWindow, &charPos->rcDocument);
    return true;
}

LRESULT WebView::onIMERequestReconvertString(Frame* targetFrame, RECONVERTSTRING* reconvertString)
{
    auto selectedRange = targetFrame->selection().selection().toNormalizedRange();
    String text;
    if (selectedRange)
        text = plainText(*selectedRange);
    if (!reconvertString)
        return sizeof(RECONVERTSTRING) + text.length() * sizeof(UChar);

    unsigned totalSize = sizeof(RECONVERTSTRING) + text.length() * sizeof(UChar);
    if (totalSize > reconvertString->dwSize)
        return 0;
    reconvertString->dwCompStrLen = text.length();
    reconvertString->dwStrLen = text.length();
    reconvertString->dwTargetStrLen = text.length();
    reconvertString->dwStrOffset = sizeof(RECONVERTSTRING);
    StringView(text).getCharactersWithUpconvert(reinterpret_cast<UChar*>(reconvertString + 1));
    return totalSize;
}

LRESULT WebView::onIMERequest(WPARAM request, LPARAM data)
{
    LOG(TextInput, "onIMERequest %s", imeRequestName(request).latin1().data());
    Frame& targetFrame = m_page->focusController().focusedOrMainFrame();
    if (!targetFrame.editor().canEdit())
        return 0;

    switch (request) {
        case IMR_RECONVERTSTRING:
            return onIMERequestReconvertString(&targetFrame, (RECONVERTSTRING*)data);

        case IMR_QUERYCHARPOSITION:
            return onIMERequestCharPosition(&targetFrame, (IMECHARPOSITION*)data);
    }
    return 0;
}

bool WebView::onIMESelect(WPARAM wparam, LPARAM lparam)
{
    UNUSED_PARAM(wparam);
    UNUSED_PARAM(lparam);
    LOG(TextInput, "onIMESelect locale %ld %s", lparam, wparam ? "select" : "deselect");
    return false;
}

bool WebView::onIMESetContext(WPARAM wparam, LPARAM)
{
    LOG(TextInput, "onIMESetContext %s", wparam ? "active" : "inactive");
    return false;
}

HRESULT WebView::inspector(_COM_Outptr_opt_ IWebInspector** inspector)
{
    if (!inspector)
        return E_POINTER;
    *inspector = nullptr;
    if (!m_webInspector)
        m_webInspector.adoptRef(WebInspector::createInstance(this, m_inspectorClient));

    return m_webInspector.copyRefTo(inspector);
}


HRESULT WebView::windowAncestryDidChange()
{
    HWND newParent;
    if (m_viewWindow)
        newParent = findTopLevelParent(m_hostWindow);
    else {
        // There's no point in tracking active state changes of our parent window if we don't have
        // a window ourselves.
        newParent = nullptr;
    }

    if (newParent == m_topLevelParent)
        return S_OK;

    if (m_topLevelParent)
        WindowMessageBroadcaster::removeListener(m_topLevelParent, this);

    m_topLevelParent = newParent;

    if (m_topLevelParent)
        WindowMessageBroadcaster::addListener(m_topLevelParent, this);

    if (m_page)
        m_page->setDeviceScaleFactor(deviceScaleFactor());

    updateActiveState();

    return S_OK;
}

bool WebView::paintCompositedContentToHDC(HDC deviceContext)
{
    if (!isAcceleratedCompositing() || usesLayeredWindow())
        return false;

#if USE(CA)
    m_layerTreeHost->flushPendingLayerChangesNow();
#elif USE(TEXTURE_MAPPER_GL)
    m_acceleratedCompositingContext->flushAndRenderLayers();
#endif

    // Flushing might have taken us out of compositing mode.
    if (!isAcceleratedCompositing())
        return false;

#if USE(CA)
    m_layerTreeHost->paint(deviceContext);
#endif

    return true;
}

HRESULT WebView::paintDocumentRectToContext(RECT rect, _In_ HDC deviceContext)
{
    if (!deviceContext)
        return E_POINTER;

    if (!m_mainFrame)
        return E_UNEXPECTED;

    if (paintCompositedContentToHDC(deviceContext))
        return S_OK;

    return m_mainFrame->paintDocumentRectToContext(rect, deviceContext);
}

HRESULT WebView::paintScrollViewRectToContextAtPoint(RECT rect, POINT pt, _In_ HDC deviceContext)
{
    if (!deviceContext)
        return E_POINTER;

    if (!m_mainFrame)
        return E_UNEXPECTED;

    if (paintCompositedContentToHDC(deviceContext))
        return S_OK;

    return m_mainFrame->paintScrollViewRectToContextAtPoint(rect, pt, deviceContext);
}

HRESULT WebView::reportException(_In_ JSContextRef context, _In_ JSValueRef exception)
{
    if (!context || !exception)
        return E_INVALIDARG;

    JSC::JSGlobalObject* globalObject = toJS(context);
    JSC::JSLockHolder lock(globalObject);

    // Make sure the context has a DOMWindow global object, otherwise this context didn't originate from a WebView.
    if (!globalObject->inherits<JSDOMWindow>())
        return E_FAIL;

    WebCore::reportException(globalObject, toJS(globalObject, exception));
    return S_OK;
}

HRESULT WebView::elementFromJS(_In_ JSContextRef context, _In_ JSValueRef nodeObject, _COM_Outptr_opt_ IDOMElement** element)
{
    if (!element)
        return E_POINTER;

    *element = nullptr;

    if (!context || !nodeObject)
        return E_INVALIDARG;

    JSC::JSGlobalObject* lexicalGlobalObject = toJS(context);
    JSC::JSLockHolder lock(lexicalGlobalObject);
    Element* elt = JSElement::toWrapped(lexicalGlobalObject->vm(), toJS(lexicalGlobalObject, nodeObject));
    if (!elt)
        return E_FAIL;

    *element = DOMElement::createInstance(elt);
    return S_OK;
}

HRESULT WebView::setCustomHTMLTokenizerTimeDelay(double timeDelay)
{
    ASSERT_NOT_REACHED();
    return E_FAIL;
}

HRESULT WebView::setCustomHTMLTokenizerChunkSize(int chunkSize)
{
    ASSERT_NOT_REACHED();
    return E_FAIL;
}

HRESULT WebView::backingStore(_Deref_opt_out_ HBITMAP* hBitmap)
{
    if (!hBitmap)
        return E_POINTER;
    if (!m_backingStoreBitmap)
        return E_FAIL;
    *hBitmap = m_backingStoreBitmap->get();
    return S_OK;
}

HRESULT WebView::setTransparent(BOOL transparent)
{
    if (m_transparent == !!transparent)
        return S_OK;

    m_transparent = transparent;

    if (!m_mainFrame)
        return E_UNEXPECTED;

    m_mainFrame->updateBackground();
    return S_OK;
}

HRESULT WebView::transparent(_Out_ BOOL* transparent)
{
    if (!transparent)
        return E_POINTER;

    *transparent = this->transparent() ? TRUE : FALSE;
    return S_OK;
}

static bool setWindowStyle(HWND window, int index, LONG_PTR newValue)
{
    // According to MSDN, if the last value of the flag we are setting was zero,
    // then SetWindowLongPtr returns zero, even though the call succeeded. So,
    // we have to clear the error state, then check the last error after
    // setting the value to see if it actually was a failure.
    ::SetLastError(0);
    return ::SetWindowLongPtr(window, index, newValue) || !::GetLastError();
}

HRESULT WebView::setUsesLayeredWindow(BOOL usesLayeredWindow)
{
    if (m_usesLayeredWindow == !!usesLayeredWindow)
        return S_OK;

    if (!m_viewWindow)
        return E_FAIL;

    RECT rect;
    ::GetWindowRect(m_viewWindow, &rect);

    LONG_PTR origExStyle = ::GetWindowLongPtr(m_viewWindow, GWL_EXSTYLE);
    LONG_PTR origStyle = ::GetWindowLongPtr(m_viewWindow, GWL_STYLE);

    // The logic here has to account for the way SetParent works.
    // According to MSDN, to go from a child window to a popup window,
    // you must clear the child bit after setting the parent to 0.
    // On the other hand, to go from a popup window to a child, you
    // must clear the popup state before setting the parent.
    if (usesLayeredWindow) {
        LONG_PTR newExStyle = origExStyle | WS_EX_LAYERED;
        LONG_PTR newStyle = (origStyle & ~(WS_CHILD | WS_CLIPSIBLINGS | WS_CLIPCHILDREN)) | WS_POPUP;

        HWND origParent = ::SetParent(m_viewWindow, 0);

        if (!setWindowStyle(m_viewWindow, GWL_STYLE, newStyle)) {
            ::SetParent(m_viewWindow, origParent);
            return E_FAIL;
        }

        if (!setWindowStyle(m_viewWindow, GWL_EXSTYLE, newExStyle)) {
            setWindowStyle(m_viewWindow, GWL_STYLE, origStyle);
            ::SetParent(m_viewWindow, origParent);
            return E_FAIL;
        }
    } else {
        LONG_PTR newExStyle = origExStyle & ~WS_EX_LAYERED;
        LONG_PTR newStyle = (origStyle & ~WS_POPUP) | WS_CHILD | WS_CLIPSIBLINGS | WS_CLIPCHILDREN;

        if (!setWindowStyle(m_viewWindow, GWL_EXSTYLE, newExStyle))
            return E_FAIL;

        if (!setWindowStyle(m_viewWindow, GWL_STYLE, newStyle)) {
            setWindowStyle(m_viewWindow, GWL_EXSTYLE, origExStyle);
            return E_FAIL;
        }

        ::SetParent(m_viewWindow, m_hostWindow ? m_hostWindow : HWND_MESSAGE);
    }

    // MSDN indicates that SetWindowLongPtr doesn't take effect for some settings until a
    // SetWindowPos is called.
    ::SetWindowPos(m_viewWindow, 0, rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top,
        SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED);

    m_usesLayeredWindow = usesLayeredWindow;
    return S_OK;
}

HRESULT WebView::usesLayeredWindow(_Out_ BOOL* usesLayeredWindow)
{
    if (!usesLayeredWindow)
        return E_POINTER;

    *usesLayeredWindow = this->usesLayeredWindow() ? TRUE : FALSE;
    return S_OK;
}

HRESULT WebView::setCookieEnabled(BOOL enable)
{
    if (!m_page)
        return E_FAIL;

    m_page->settings().setCookieEnabled(enable);
    return S_OK;
}

HRESULT WebView::cookieEnabled(_Out_ BOOL* enabled)
{
    if (!enabled)
        return E_POINTER;

    if (!m_page)
        return E_FAIL;

    *enabled = m_page->settings().cookieEnabled();
    return S_OK;
}

HRESULT WebView::setMediaVolume(float volume)
{
    if (!m_page)
        return E_FAIL;

    m_page->setMediaVolume(volume);
    return S_OK;
}

HRESULT WebView::mediaVolume(_Out_ float* volume)
{
    if (!volume)
        return E_POINTER;

    if (!m_page)
        return E_FAIL;

    *volume = m_page->mediaVolume();
    return S_OK;
}

HRESULT WebView::setDefersCallbacks(BOOL defersCallbacks)
{
    if (!m_page)
        return E_FAIL;

    m_page->setDefersLoading(defersCallbacks);
    return S_OK;
}

HRESULT WebView::defersCallbacks(_Out_ BOOL* defersCallbacks)
{
    if (!defersCallbacks)
        return E_POINTER;

    if (!m_page)
        return E_FAIL;

    *defersCallbacks = m_page->defersLoading();
    return S_OK;
}

HRESULT WebView::globalHistoryItem(_COM_Outptr_opt_ IWebHistoryItem** item)
{
    if (!item)
        return E_POINTER;
    *item = nullptr;
    return S_OK;
}

HRESULT WebView::setAlwaysUsesComplexTextCodePath(BOOL complex)
{
    WebCoreSetAlwaysUsesComplexTextCodePath(complex);

    return S_OK;
}

HRESULT WebView::alwaysUsesComplexTextCodePath(_Out_ BOOL* complex)
{
    if (!complex)
        return E_POINTER;

    *complex = WebCoreAlwaysUsesComplexTextCodePath();
    return S_OK;
}

HRESULT WebView::registerEmbeddedViewMIMEType(_In_ BSTR mimeType)
{
    if (!mimeType)
        return E_POINTER;

    if (!m_embeddedViewMIMETypes)
        m_embeddedViewMIMETypes = makeUnique<HashSet<String>>();

    m_embeddedViewMIMETypes->add(toString(mimeType));
    return S_OK;
}

bool WebView::shouldUseEmbeddedView(const WTF::String& mimeType) const
{
    if (!m_embeddedViewMIMETypes)
        return false;

    if (mimeType.isEmpty())
        return false;

    return m_embeddedViewMIMETypes->contains(mimeType);
}

bool WebView::onGetObject(WPARAM wParam, LPARAM lParam, LRESULT& lResult) const
{
    lResult = 0;

    if (static_cast<LONG>(lParam) != OBJID_CLIENT)
        return false;

    AXObjectCache::enableAccessibility();

    // Get the accessible object for the top-level frame.
    WebFrame* mainFrameImpl = topLevelFrame();
    if (!mainFrameImpl)
        return false;

    COMPtr<IAccessible> accessible = mainFrameImpl->accessible();
    if (!accessible)
        return false;

    if (!accessibilityLib) {
        if (!(accessibilityLib = ::LoadLibraryW(L"oleacc.dll")))
            return false;
    }

    static LPFNLRESULTFROMOBJECT procPtr = reinterpret_cast<LPFNLRESULTFROMOBJECT>(::GetProcAddress(accessibilityLib, "LresultFromObject"));
    if (!procPtr)
        return false;

    // LresultFromObject returns a reference to the accessible object, stored
    // in an LRESULT. If this call is not successful, Windows will handle the
    // request through DefWindowProc.
    return SUCCEEDED(lResult = procPtr(__uuidof(IAccessible), wParam, accessible.get()));
}

STDMETHODIMP WebView::AccessibleObjectFromWindow(HWND hwnd, DWORD objectID, REFIID riid, void** ppObject)
{
    ASSERT(accessibilityLib);
    static LPFNACCESSIBLEOBJECTFROMWINDOW procPtr = reinterpret_cast<LPFNACCESSIBLEOBJECTFROMWINDOW>(::GetProcAddress(accessibilityLib, "AccessibleObjectFromWindow"));
    if (!procPtr)
        return E_FAIL;
    return procPtr(hwnd, objectID, riid, ppObject);
}

HRESULT WebView::setMemoryCacheDelegateCallsEnabled(BOOL enabled)
{
    if (!m_page)
        return E_FAIL;

    m_page->setMemoryCacheClientCallsEnabled(enabled);
    return S_OK;
}

HRESULT WebView::setJavaScriptURLsAreAllowed(BOOL)
{
    return E_NOTIMPL;
}

HRESULT WebView::setCanStartPlugins(BOOL canStartPlugins)
{
    if (!m_page)
        return E_FAIL;

    m_page->setCanStartMedia(canStartPlugins);
    return S_OK;
}

void WebView::enterVideoFullscreenForVideoElement(HTMLVideoElement& videoElement)
{
#if ENABLE(VIDEO) && !USE(GSTREAMER) && !USE(MEDIA_FOUNDATION)
    if (m_fullScreenVideoController) {
        if (m_fullScreenVideoController->videoElement() == &videoElement) {
            // The backend may just warn us that the underlaying plaftormMovie()
            // has changed. Just force an update.
            m_fullScreenVideoController->setVideoElement(&videoElement);
            return; // No more to do.
        }

        // First exit Fullscreen for the old videoElement.
        m_fullScreenVideoController->videoElement()->exitFullscreen();
        // This previous call has to trigger exitFullscreen,
        // which has to clear m_fullScreenVideoController.
        ASSERT(!m_fullScreenVideoController);
    }

    m_fullScreenVideoController = makeUnique<FullscreenVideoController>();
    m_fullScreenVideoController->setVideoElement(&videoElement);
    m_fullScreenVideoController->enterFullscreen();
#endif
}

void WebView::exitVideoFullscreenForVideoElement(WebCore::HTMLVideoElement&)
{
#if ENABLE(VIDEO) && !USE(GSTREAMER) && !USE(MEDIA_FOUNDATION)
    if (!m_fullScreenVideoController)
        return;
    
    m_fullScreenVideoController->exitFullscreen();
    m_fullScreenVideoController = nullptr;
#endif
}

HRESULT WebView::addUserScriptToGroup(_In_ BSTR groupName, _In_opt_ IWebScriptWorld* iWorld, _In_ BSTR source, _In_ BSTR url,
    unsigned allowListCount, __inout_ecount_full(allowListCount) BSTR* allowList,
    unsigned blockListCount, __inout_ecount_full(blockListCount) BSTR* blocklist,
    WebUserScriptInjectionTime injectionTime)
{
    return addUserScriptToGroup(groupName, iWorld, source, url, allowListCount, allowList, blockListCount, blocklist, injectionTime, WebInjectInAllFrames);
}

static Vector<String> toStringVector(BSTR* entries, unsigned count)
{
    Vector<String> entriesVector;
    if (!entries || !count)
        return entriesVector;

    for (unsigned i = 0; i < count; ++i)
        entriesVector.append(toString(entries[i]));

    return entriesVector;
}

HRESULT WebView::addUserScriptToGroup(_In_ BSTR groupName, _In_opt_ IWebScriptWorld* iWorld, _In_ BSTR source, _In_ BSTR url,
    unsigned allowListCount, __inout_ecount_full(allowListCount) BSTR* allowList,
    unsigned blockListCount, __inout_ecount_full(blockListCount) BSTR* blocklist,
    WebUserScriptInjectionTime injectionTime, WebUserContentInjectedFrames injectedFrames)
{
    String group = toString(groupName);
    if (group.isEmpty())
        return E_FAIL;

    auto viewGroup = WebViewGroup::getOrCreate(group, String());

    if (!iWorld)
        return E_POINTER;

    WebScriptWorld* world = reinterpret_cast<WebScriptWorld*>(iWorld);
    auto userScript = makeUnique<UserScript>(source, toURL(url), toStringVector(allowList, allowListCount),
        toStringVector(blocklist, blockListCount), injectionTime == WebInjectAtDocumentStart ? UserScriptInjectionTime::DocumentStart : UserScriptInjectionTime::DocumentEnd,
        injectedFrames == WebInjectInAllFrames ? UserContentInjectedFrames::InjectInAllFrames : UserContentInjectedFrames::InjectInTopFrameOnly, WaitForNotificationBeforeInjecting::No);
    viewGroup->userContentController().addUserScript(world->world(), WTFMove(userScript));
    return S_OK;
}

HRESULT WebView::addUserStyleSheetToGroup(_In_ BSTR groupName, _In_opt_ IWebScriptWorld* iWorld, _In_ BSTR source, _In_ BSTR url,
    unsigned allowListCount, __inout_ecount_full(allowListCount) BSTR* allowList, unsigned blockListCount, __inout_ecount_full(blockListCount) BSTR* blocklist)
{
    return addUserStyleSheetToGroup(groupName, iWorld, source, url, allowListCount, allowList, blockListCount, blocklist, WebInjectInAllFrames);
}

HRESULT WebView::addUserStyleSheetToGroup(_In_ BSTR groupName, _In_opt_ IWebScriptWorld* iWorld, _In_ BSTR source, _In_ BSTR url,
    unsigned allowListCount, __inout_ecount_full(allowListCount) BSTR* allowList, unsigned blockListCount, __inout_ecount_full(blockListCount) BSTR* blocklist,
    WebUserContentInjectedFrames injectedFrames)
{
    String group = toString(groupName);
    if (group.isEmpty())
        return E_FAIL;

    auto viewGroup = WebViewGroup::getOrCreate(group, String());

    if (!iWorld)
        return E_POINTER;

    WebScriptWorld* world = reinterpret_cast<WebScriptWorld*>(iWorld);
    auto styleSheet = makeUnique<UserStyleSheet>(source, toURL(url), toStringVector(allowList, allowListCount), toStringVector(blocklist, blockListCount),
        injectedFrames == WebInjectInAllFrames ? UserContentInjectedFrames::InjectInAllFrames : UserContentInjectedFrames::InjectInTopFrameOnly, UserStyleUserLevel);
    viewGroup->userContentController().addUserStyleSheet(world->world(), WTFMove(styleSheet), InjectInExistingDocuments);
    return S_OK;
}

HRESULT WebView::removeUserScriptFromGroup(_In_ BSTR groupName, _In_opt_ IWebScriptWorld* iWorld, _In_ BSTR url)
{
    String group = toString(groupName);
    if (group.isEmpty())
        return E_FAIL;

    auto viewGroup = WebViewGroup::get(group);
    if (!viewGroup)
        return S_OK;

    if (!iWorld)
        return E_POINTER;

    WebScriptWorld* world = reinterpret_cast<WebScriptWorld*>(iWorld);
    viewGroup->userContentController().removeUserScript(world->world(), toURL(url));
    return S_OK;
}

HRESULT WebView::removeUserStyleSheetFromGroup(_In_ BSTR groupName, _In_opt_ IWebScriptWorld* iWorld, _In_ BSTR url)
{
    String group = toString(groupName);
    if (group.isEmpty())
        return E_FAIL;

    auto viewGroup = WebViewGroup::get(group);
    if (!viewGroup)
        return S_OK;

    if (!iWorld)
        return E_POINTER;

    WebScriptWorld* world = reinterpret_cast<WebScriptWorld*>(iWorld);
    viewGroup->userContentController().removeUserStyleSheet(world->world(), toURL(url));
    return S_OK;
}

HRESULT WebView::removeUserScriptsFromGroup(_In_ BSTR groupName, _In_opt_ IWebScriptWorld* iWorld)
{
    String group = toString(groupName);
    if (group.isEmpty())
        return E_FAIL;

    auto viewGroup = WebViewGroup::get(group);
    if (!viewGroup)
        return S_OK;

    if (!iWorld)
        return E_POINTER;

    WebScriptWorld* world = reinterpret_cast<WebScriptWorld*>(iWorld);
    viewGroup->userContentController().removeUserScripts(world->world());
    return S_OK;
}

HRESULT WebView::removeUserStyleSheetsFromGroup(_In_ BSTR groupName, _In_opt_ IWebScriptWorld* iWorld)
{
    String group = toString(groupName);
    if (group.isEmpty())
        return E_FAIL;

    auto viewGroup = WebViewGroup::get(group);
    if (!viewGroup)
        return S_OK;

    if (!iWorld)
        return E_POINTER;

    WebScriptWorld* world = reinterpret_cast<WebScriptWorld*>(iWorld);
    viewGroup->userContentController().removeUserStyleSheets(world->world());
    return S_OK;
}

HRESULT WebView::removeAllUserContentFromGroup(_In_ BSTR groupName)
{
    String group = toString(groupName);
    if (group.isEmpty())
        return E_FAIL;

    auto viewGroup = WebViewGroup::get(group);
    if (!viewGroup)
        return S_OK;

    viewGroup->userContentController().removeAllUserContent();
    return S_OK;
}

HRESULT WebView::invalidateBackingStore(_In_ const RECT* rect)
{
    if (!IsWindow(m_viewWindow))
        return S_OK;

    RECT clientRect;
    if (!GetClientRect(m_viewWindow, &clientRect))
        return E_FAIL;

    RECT rectToInvalidate;
    if (!rect)
        rectToInvalidate = clientRect;
    else if (!IntersectRect(&rectToInvalidate, &clientRect, rect))
        return S_OK;

    repaint(rectToInvalidate, true);
    return S_OK;
}

HRESULT WebView::addOriginAccessAllowListEntry(_In_ BSTR sourceOrigin, _In_ BSTR destinationProtocol, _In_ BSTR destinationHost, BOOL allowDestinationSubdomains)
{
    SecurityPolicy::addOriginAccessAllowlistEntry(SecurityOrigin::createFromString(toString(sourceOrigin)).get(), toString(destinationProtocol), toString(destinationHost), allowDestinationSubdomains);
    return S_OK;
}

HRESULT WebView::removeOriginAccessAllowListEntry(_In_ BSTR sourceOrigin, _In_ BSTR destinationProtocol, _In_ BSTR destinationHost, BOOL allowDestinationSubdomains)
{
    SecurityPolicy::removeOriginAccessAllowlistEntry(SecurityOrigin::createFromString(toString(sourceOrigin)).get(), toString(destinationProtocol), toString(destinationHost), allowDestinationSubdomains);
    return S_OK;
}

HRESULT WebView::resetOriginAccessAllowLists()
{
    SecurityPolicy::resetOriginAccessAllowlists();
    return S_OK;
}
 
HRESULT WebView::setHistoryDelegate(_In_ IWebHistoryDelegate* historyDelegate)
{
    m_historyDelegate = historyDelegate;
    return S_OK;
}

HRESULT WebView::historyDelegate(_COM_Outptr_opt_ IWebHistoryDelegate** historyDelegate)
{
    if (!historyDelegate)
        return E_POINTER;
    *historyDelegate = nullptr;
    return m_historyDelegate.copyRefTo(historyDelegate);
}

HRESULT WebView::addVisitedLinks(__inout_ecount_full(visitedURLCount) BSTR* visitedURLs, unsigned visitedURLCount)
{
    auto& visitedLinkStore = m_webViewGroup->visitedLinkStore();
    for (unsigned i = 0; i < visitedURLCount; ++i) {
        BSTR url = visitedURLs[i];
        unsigned length = SysStringLen(url);

        visitedLinkStore.addVisitedLink(String(url, length));
    }

    return S_OK;
}

void WebView::downloadURL(const URL& url)
{
    if (!m_downloadDelegate)
        return;

    // It's the delegate's job to ref the WebDownload to keep it alive - otherwise it will be
    // destroyed when this function returns.
#if USE(CURL)
    // For Curl we need to set the user agent, otherwise the download request gets the default Curl user agent string.
    ResourceRequest request(url);
    request.setHTTPUserAgent(userAgentForKURL(url));
    COMPtr<WebDownload> download(AdoptCOM, WebDownload::createInstance(0, request, ResourceResponse(), m_downloadDelegate.get()));
#else
    COMPtr<WebDownload> download(AdoptCOM, WebDownload::createInstance(url, m_downloadDelegate.get()));
#endif
    download->start();
}

void WebView::setRootChildLayer(GraphicsLayer* layer)
{
    setAcceleratedCompositing(layer ? true : false);
#if USE(CA)
    if (!m_backingLayer)
        return;

    if (layer)
        m_backingLayer->addChild(*layer);
    else
        m_backingLayer->removeAllChildren();

#elif USE(TEXTURE_MAPPER_GL)
    if (!m_acceleratedCompositingContext)
        return;
    m_acceleratedCompositingContext->setRootCompositingLayer(layer);
#endif
}

void WebView::flushPendingGraphicsLayerChangesSoon()
{
#if USE(CA)
    if (!m_layerTreeHost) {
        m_page->isolatedUpdateRendering();
        return;
    }
    m_layerTreeHost->flushPendingGraphicsLayerChangesSoon();
#elif USE(TEXTURE_MAPPER_GL)
    if (!isAcceleratedCompositing()) {
        m_page->isolatedUpdateRendering();
        return;
    }
    if (!m_acceleratedCompositingContext)
        return;
    m_acceleratedCompositingContext->flushPendingLayerChangesSoon();
#endif
}

void WebView::setAcceleratedCompositing(bool accelerated)
{
    if (m_isAcceleratedCompositing == accelerated)
        return;

#if USE(CA)
    if (!CACFLayerTreeHost::acceleratedCompositingAvailable())
        return;

    if (accelerated) {
        m_layerTreeHost = CACFLayerTreeHost::create();
        if (m_layerTreeHost) {
            m_isAcceleratedCompositing = true;

            m_layerTreeHost->setShouldInvertColors(m_shouldInvertColors);

            m_layerTreeHost->setClient(this);
            ASSERT(m_viewWindow);
            m_layerTreeHost->setWindow(m_viewWindow);
            m_layerTreeHost->setPage(page());
            m_layerTreeHost->setScaleFactor(deviceScaleFactor());

            // FIXME: We could perhaps get better performance by never allowing this layer to
            // become tiled (or choosing a higher-than-normal tiling threshold).
            // <http://webkit.org/b/52603>
            m_backingLayer = GraphicsLayer::create(0, *this);
            m_backingLayer->setDrawsContent(true);
            m_backingLayer->setContentsOpaque(true);
            RECT clientRect;
            ::GetClientRect(m_viewWindow, &clientRect);
            m_backingLayer->setSize(IntRect(clientRect).size());
            m_backingLayer->setNeedsDisplay();
            m_layerTreeHost->setRootChildLayer(PlatformCALayer::platformCALayerForLayer(m_backingLayer->platformLayer()).get());

#if !HAVE(CACFLAYER_SETCONTENTSSCALE)
            TransformationMatrix m;
            m.scale(deviceScaleFactor());
            m_backingLayer->setAnchorPoint(FloatPoint3D());
            m_backingLayer->setTransform(m);
#endif

            // We aren't going to be using our backing store while we're in accelerated compositing
            // mode. But don't delete it immediately, in case we switch out of accelerated
            // compositing mode soon (e.g., if we're only compositing for a :hover animation).
            deleteBackingStoreSoon();
        }
    } else {
        ASSERT(m_layerTreeHost);
        m_layerTreeHost->setClient(0);
        m_layerTreeHost->setWindow(0);
        m_layerTreeHost = nullptr;
        m_backingLayer = nullptr;
        m_isAcceleratedCompositing = false;
    }
#elif USE(TEXTURE_MAPPER_GL)
    if (accelerated && !m_acceleratedCompositingContext)
        m_acceleratedCompositingContext = makeUnique<AcceleratedCompositingContext>(*this);
    m_isAcceleratedCompositing = accelerated;
#endif
}

#if PLATFORM(WIN) && USE(AVFOUNDATION)
WebCore::GraphicsDeviceAdapter* WebView::graphicsDeviceAdapter() const
{
    if (!m_layerTreeHost)
        return 0;
    return m_layerTreeHost->graphicsDeviceAdapter();
}
#endif

HRESULT WebView::unused1()
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

HRESULT WebView::unused2()
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

HRESULT WebView::unused3()
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

HRESULT WebView::unused4()
{
    ASSERT_NOT_REACHED();
    return E_NOTIMPL;
}

HRESULT WebView::unused5()
{
    ASSERT_NOT_REACHED();

    // The following line works around a linker issue in MSVC. unused5 should never be called,
    // and this code does nothing more than force the symbol to be included in WebKit dll.
    (void)WebCore::PathUtilities::pathWithShrinkWrappedRects(Vector<FloatRect>(), 0);

    return E_NOTIMPL;
}

HRESULT WebView::setGeolocationProvider(_In_opt_ IWebGeolocationProvider* locationProvider)
{
    m_geolocationProvider = locationProvider;
    return S_OK;
}

HRESULT WebView::geolocationProvider(_COM_Outptr_opt_ IWebGeolocationProvider** locationProvider)
{
    if (!locationProvider)
        return E_POINTER;
    *locationProvider = nullptr;
    if (!m_geolocationProvider)
        return E_FAIL;

    return m_geolocationProvider.copyRefTo(locationProvider);
}

HRESULT WebView::geolocationDidChangePosition(_In_opt_ IWebGeolocationPosition* position)
{
    if (!m_page)
        return E_FAIL;
    GeolocationController::from(m_page)->positionChanged(core(position));
    return S_OK;
}

HRESULT WebView::geolocationDidFailWithError(_In_opt_ IWebError* error)
{
    if (!m_page)
        return E_FAIL;
    if (!error)
        return E_POINTER;

    BString description;
    if (FAILED(error->localizedDescription(&description)))
        return E_FAIL;

    auto geolocationError = GeolocationError::create(GeolocationError::PositionUnavailable, toString(description));
    GeolocationController::from(m_page)->errorOccurred(geolocationError.get());
    return S_OK;
}

HRESULT WebView::setDomainRelaxationForbiddenForURLScheme(BOOL forbidden, _In_ BSTR scheme)
{
    LegacySchemeRegistry::setDomainRelaxationForbiddenForURLScheme(forbidden, toString(scheme));
    return S_OK;
}

HRESULT WebView::registerURLSchemeAsSecure(_In_ BSTR scheme)
{
    LegacySchemeRegistry::registerURLSchemeAsSecure(toString(scheme));
    return S_OK;
}

HRESULT WebView::registerURLSchemeAsAllowingLocalStorageAccessInPrivateBrowsing(_In_ BSTR scheme)
{
    return S_OK;
}

HRESULT WebView::registerURLSchemeAsAllowingDatabaseAccessInPrivateBrowsing(_In_ BSTR scheme)
{
    LegacySchemeRegistry::registerURLSchemeAsAllowingDatabaseAccessInPrivateBrowsing(toString(scheme));
    return S_OK;
}

HRESULT WebView::nextDisplayIsSynchronous()
{
    m_nextDisplayIsSynchronous = true;
    return S_OK;
}

void WebView::notifyAnimationStarted(const GraphicsLayer*, const String&, MonotonicTime)
{
    // We never set any animations on our backing layer.
    ASSERT_NOT_REACHED();
}

void WebView::notifyFlushRequired(const GraphicsLayer*)
{
    flushPendingGraphicsLayerChangesSoon();
}

void WebView::paintContents(const GraphicsLayer*, GraphicsContext& context, const FloatRect& inClipPixels, GraphicsLayerPaintBehavior)
{
    Frame* frame = core(m_mainFrame);
    if (!frame)
        return;

    float scaleFactor = deviceScaleFactor();
    float inverseScaleFactor = 1.0f / scaleFactor;

    FloatRect logicalClip = inClipPixels;
    logicalClip.scale(inverseScaleFactor);

    context.save();
    context.scale(FloatSize(scaleFactor, scaleFactor));
    context.clip(logicalClip);
    frame->view()->paint(context, enclosingIntRect(logicalClip));
    context.restore();
}

#if USE(CA)
void WebView::flushPendingGraphicsLayerChanges()
{
    Frame* coreFrame = core(m_mainFrame);
    if (!coreFrame)
        return;
    FrameView* view = coreFrame->view();
    if (!view)
        return;

    if (!isAcceleratedCompositing())
        return;

    m_page->isolatedUpdateRendering();

    // Updating layout might have taken us out of compositing mode.
    if (m_backingLayer)
        m_backingLayer->flushCompositingStateForThisLayerOnly();

    view->flushCompositingStateIncludingSubframes();
}
#endif

class EnumTextMatches final : public IEnumTextMatches
{
    long m_ref;
    UINT m_index;
    Vector<IntRect> m_rects;
public:
    EnumTextMatches(Vector<IntRect>* rects)
        : m_ref(1)
        , m_index(0)
    {
        m_rects = *rects;
    }

    virtual HRESULT STDMETHODCALLTYPE QueryInterface(_In_ REFIID riid, void** ppv)
    {
        if (IsEqualGUID(riid, IID_IUnknown) || IsEqualGUID(riid, IID_IEnumTextMatches)) {
            *ppv = this;
            AddRef();
        }

        return *ppv?S_OK:E_NOINTERFACE;
    }

    virtual ULONG STDMETHODCALLTYPE AddRef()
    {
        return m_ref++;
    }
    
    virtual ULONG STDMETHODCALLTYPE Release()
    {
        if (m_ref == 1) {
            delete this;
            return 0;
        }
        else
            return m_ref--;
    }

    virtual HRESULT STDMETHODCALLTYPE Next(ULONG, RECT* rect, ULONG* pceltFetched)
    {
        if (m_index < m_rects.size()) {
            if (pceltFetched)
                *pceltFetched = 1;
            *rect = m_rects[m_index];
            m_index++;
            return S_OK;
        }

        if (pceltFetched)
            *pceltFetched = 0;

        return S_FALSE;
    }
    virtual HRESULT STDMETHODCALLTYPE Skip(ULONG celt)
    {
        m_index += celt;
        return S_OK;
    }
    virtual HRESULT STDMETHODCALLTYPE Reset(void)
    {
        m_index = 0;
        return S_OK;
    }
    virtual HRESULT STDMETHODCALLTYPE Clone(_COM_Outptr_opt_ IEnumTextMatches** matches)
    {
        if (!matches)
            return E_POINTER;
        *matches = nullptr;
        return E_NOTIMPL;
    }
};

HRESULT createMatchEnumerator(Vector<IntRect>* rects, IEnumTextMatches** matches)
{
    *matches = new EnumTextMatches(rects);
    return (*matches)?S_OK:E_OUTOFMEMORY;
}

Page* core(IWebView* iWebView)
{
    Page* page = 0;

    COMPtr<WebView> webView;
    if (SUCCEEDED(iWebView->QueryInterface(&webView)) && webView)
        page = webView->page();

    return page;
}

HRESULT WebView::defaultMinimumTimerInterval(_Out_ double* interval)
{
    if (!interval)
        return E_POINTER;
    *interval = DOMTimer::defaultMinimumInterval().seconds();
    return S_OK;
}

HRESULT WebView::setMinimumTimerInterval(double interval)
{
    if (!m_page)
        return E_FAIL;

    page()->settings().setMinimumDOMTimerInterval(Seconds { interval });
    return S_OK;
}

HRESULT WebView::httpPipeliningEnabled(_Out_ BOOL* enabled)
{
    if (!enabled)
        return E_POINTER;
    *enabled = ResourceRequest::httpPipeliningEnabled();
    return S_OK;
}

HRESULT WebView::setHTTPPipeliningEnabled(BOOL enabled)
{
    ResourceRequest::setHTTPPipeliningEnabled(enabled);
    return S_OK;
}

#if ENABLE(FULLSCREEN_API)
bool WebView::supportsFullScreenForElement(const WebCore::Element*, bool withKeyboard) const
{
    if (withKeyboard)
        return false;

    BOOL enabled = FALSE;
    if (!m_preferences || FAILED(m_preferences->isFullScreenEnabled(&enabled)))
        return false;

    return enabled;
}

bool WebView::isFullScreen() const 
{
    return m_fullscreenController && m_fullscreenController->isFullScreen();
}

FullScreenController* WebView::fullScreenController()
{
    if (!m_fullscreenController)
        m_fullscreenController = std::unique_ptr<FullScreenController>(new FullScreenController(this));
    return m_fullscreenController.get();
}

void WebView::setFullScreenElement(RefPtr<Element>&& element)
{
    m_fullScreenElement = WTFMove(element);
}

HWND WebView::fullScreenClientWindow() const
{
    return m_viewWindow;
}

HWND WebView::fullScreenClientParentWindow() const
{
    return m_hostWindow;
}

void WebView::fullScreenClientSetParentWindow(HWND hostWindow)
{
    setHostWindow(hostWindow);
}

void WebView::fullScreenClientWillEnterFullScreen()
{
    ASSERT(m_fullScreenElement);
    m_fullScreenElement->document().fullscreenManager().willEnterFullscreen(*m_fullScreenElement);
}

void WebView::fullScreenClientDidEnterFullScreen()
{
    ASSERT(m_fullScreenElement);
    m_fullScreenElement->document().fullscreenManager().didEnterFullscreen();
}

void WebView::fullScreenClientWillExitFullScreen()
{
    ASSERT(m_fullScreenElement);
    m_fullScreenElement->document().fullscreenManager().cancelFullscreen();
}

void WebView::fullScreenClientDidExitFullScreen()
{
    ASSERT(m_fullScreenElement);
    m_fullScreenElement->document().fullscreenManager().didExitFullscreen();
    m_fullScreenElement = nullptr;
}

void WebView::fullScreenClientForceRepaint()
{
    ASSERT(m_fullscreenController);
    RECT windowRect { };
    frameRect(&windowRect);
    repaint(windowRect, true /*contentChanged*/, true /*immediate*/, false /*contentOnly*/);
    m_fullscreenController->repaintCompleted();
}

void WebView::fullScreenClientSaveScrollPosition()
{
    if (Frame* coreFrame = core(m_mainFrame))
        if (FrameView* view = coreFrame->view())
            m_scrollPosition = view->scrollPosition();
}

void WebView::fullScreenClientRestoreScrollPosition()
{
    if (Frame* coreFrame = core(m_mainFrame))
        if (FrameView* view = coreFrame->view())
            view->setScrollPosition(m_scrollPosition);
}

#endif
// Used by TextInputController in DumpRenderTree

HRESULT WebView::setCompositionForTesting(_In_ BSTR composition, UINT from, UINT length)
{
    if (!m_page)
        return E_FAIL;

    Frame& frame = m_page->focusController().focusedOrMainFrame();
    if (!frame.editor().canEdit())
        return E_FAIL;

    String compositionStr = toString(composition);

    Vector<CompositionUnderline> underlines;
    underlines.append(CompositionUnderline(0, compositionStr.length(), CompositionUnderlineColor::TextColor, Color(Color::black), false));
    frame.editor().setComposition(compositionStr, underlines, { }, from, from + length);

    return S_OK;
}

HRESULT WebView::hasCompositionForTesting(_Out_ BOOL* result)
{
    if (!m_page)
        return E_FAIL;

    Frame& frame = m_page->focusController().focusedOrMainFrame();
    *result = frame.editor().hasComposition();
    return S_OK;
}

HRESULT WebView::confirmCompositionForTesting(_In_ BSTR composition)
{
    if (!m_page)
        return E_FAIL;

    Frame& frame = m_page->focusController().focusedOrMainFrame();
    if (!frame.editor().canEdit())
        return E_FAIL;

    String compositionStr = toString(composition);

    if (compositionStr.isNull())
        frame.editor().confirmComposition();

    frame.editor().confirmComposition(compositionStr);

    return S_OK;
}

HRESULT WebView::compositionRangeForTesting(_Out_ UINT* startPosition, _Out_ UINT* length)
{
    if (!startPosition || !length)
        return E_POINTER;

    if (!m_page)
        return E_FAIL;

    Frame& frame = m_page->focusController().focusedOrMainFrame();
    if (!frame.editor().canEdit())
        return E_FAIL;

    auto range = frame.editor().compositionRange();
    if (!range)
        return E_FAIL;

    *startPosition = range->start.offset;
    *length = range->start.offset + range->end.offset;
    return S_OK;
}

HRESULT WebView::firstRectForCharacterRangeForTesting(UINT location, UINT length, _Out_ RECT* resultRect)
{
    if (!resultRect)
        return E_POINTER;

    if (!m_page)
        return E_FAIL;

    auto& frame = m_page->focusController().focusedOrMainFrame();
    auto* element = frame.selection().rootEditableElementOrDocumentElement();
    if (!element)
        return E_FAIL;

    auto characterRange = CharacterRange(location, length);
    auto range = resolveCharacterRange(makeRangeSelectingNodeContents(*element), characterRange);
    IntRect rect = frame.editor().firstRectForRange(range);
    IntRect resultIntRect = frame.view()->contentsToWindow(rect);

    resultIntRect.scale(deviceScaleFactor());

    resultRect->left = resultIntRect.x();
    resultRect->top = resultIntRect.y();
    resultRect->right = resultIntRect.x() + resultIntRect.width();
    resultRect->bottom = resultIntRect.y() + resultIntRect.height();

    return S_OK;
}

HRESULT WebView::selectedRangeForTesting(_Out_ UINT* location, _Out_ UINT* length)
{
    if (!location || !length)
        return E_POINTER;

    *location = 0;
    *length = 0;

    if (!m_page)
        return E_FAIL;

    Frame& frame = m_page->focusController().focusedOrMainFrame();

    auto range = frame.editor().selectedRange();
    if (!range)
        return E_FAIL;

    auto* element = frame.selection().rootEditableElementOrDocumentElement();
    if (!element)
        return E_FAIL;

    auto relativeRange = characterRange(makeBoundaryPointBeforeNodeContents(*element), *range);
    *location = static_cast<UINT>(relativeRange.location);
    *length = static_cast<UINT>(relativeRange.length);
    return S_OK;
}

// IWebViewPrivate2
HRESULT WebView::setLoadResourcesSerially(BOOL serialize)
{
    WebPlatformStrategies::initialize();
    webResourceLoadScheduler().setSerialLoadingEnabled(serialize);
    return S_OK;
}

HRESULT WebView::scaleWebView(double scale, POINT origin)
{
    if (!m_page)
        return E_FAIL;

    m_page->setPageScaleFactor(scale, origin);

    return S_OK;
}

HRESULT WebView::dispatchPendingLoadRequests()
{
    webResourceLoadScheduler().servePendingRequests();
    return S_OK;
}

float WebView::deviceScaleFactor() const
{
    if (m_customDeviceScaleFactor)
        return m_customDeviceScaleFactor;

    // FIXME(146335): Should check for Windows 8.1 High DPI Features here first.

    if (m_viewWindow)
        return WebCore::deviceScaleFactorForWindow(m_viewWindow);

    if (m_hostWindow)
        return WebCore::deviceScaleFactorForWindow(m_hostWindow);

    return WebCore::deviceScaleFactorForWindow(nullptr);
}

HRESULT WebView::setCustomBackingScaleFactor(double customScaleFactor)
{
    double oldScaleFactor = deviceScaleFactor();

    m_customDeviceScaleFactor = customScaleFactor;

    if (m_page && oldScaleFactor != deviceScaleFactor())
        m_page->setDeviceScaleFactor(deviceScaleFactor());

    return S_OK;
}

HRESULT WebView::backingScaleFactor(_Out_ double* factor)
{
    if (!factor)
        return E_POINTER;

    *factor = deviceScaleFactor();

    return S_OK;
}

HRESULT WebView::layerTreeAsString(_Deref_opt_out_ BSTR* treeBstr)
{
    if (!treeBstr)
        return E_POINTER;

    *treeBstr = nullptr;

#if USE(CA)
    if (!m_layerTreeHost)
        return S_OK;

    String tree = m_layerTreeHost->layerTreeAsString();
#elif USE(TEXTURE_MAPPER_GL)
    if (!isAcceleratedCompositing())
        return S_OK;
    String tree = m_acceleratedCompositingContext->layerTreeAsString();
#endif
    *treeBstr = BString(tree).release();
    if (!*treeBstr && tree.length())
        return E_OUTOFMEMORY;

    return S_OK;
}

HRESULT WebView::findString(_In_ BSTR string, WebFindOptions options, _Deref_opt_out_ BOOL* found)
{
    if (!found)
        return E_POINTER;

    WebCore::FindOptions coreOptions;

    if (options & WebFindOptionsCaseInsensitive)
        coreOptions.add(WebCore::CaseInsensitive);
    if (options & WebFindOptionsAtWordStarts)
        coreOptions.add(WebCore::AtWordStarts);
    if (options & WebFindOptionsTreatMedialCapitalAsWordStart)
        coreOptions.add(WebCore::TreatMedialCapitalAsWordStart);
    if (options & WebFindOptionsBackwards)
        coreOptions.add(WebCore::Backwards);
    if (options & WebFindOptionsWrapAround)
        coreOptions.add(WebCore::WrapAround);
    if (options & WebFindOptionsStartInSelection)
        coreOptions.add(WebCore::StartInSelection);

    *found = m_page->findString(toString(string), coreOptions);
    return S_OK;
}

HRESULT WebView::setVisibilityState(WebPageVisibilityState visibilityState)
{
    if (!m_page)
        return E_FAIL;
    
    m_page->setIsVisible(visibilityState == WebPageVisibilityStateVisible);

    if (visibilityState == WebPageVisibilityStatePrerender)
        m_page->setIsPrerender();

    return S_OK;
}

HRESULT WebView::exitFullscreenIfNeeded()
{
#if ENABLE(FULLSCREEN_API)
    if (fullScreenController() && fullScreenController()->isFullScreen())
        fullScreenController()->close();
#endif
    return S_OK;
}