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/*
* Copyright (C) 2007, 2013 Apple Inc. 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "WebNodeHighlight.h"
#include "WebView.h"
#include <WebCore/BitmapInfo.h>
#include <WebCore/Color.h>
#include <WebCore/GraphicsContext.h>
#include <WebCore/GraphicsContextWin.h>
#include <WebCore/HWndDC.h>
#include <WebCore/InspectorController.h>
#include <WebCore/Page.h>
#include <WebCore/WindowMessageBroadcaster.h>
#include <wtf/HashSet.h>
#include <wtf/win/GDIObject.h>
using namespace WebCore;
LRESULT CALLBACK OverlayWndProc(HWND, UINT, WPARAM, LPARAM);
static LPCTSTR kOverlayWindowClassName = TEXT("WebNodeHighlightWindowClass");
static ATOM registerOverlayClass();
static LPCTSTR kWebNodeHighlightPointerProp = TEXT("WebNodeHighlightPointer");
WebNodeHighlight::WebNodeHighlight(WebView* webView)
: m_inspectedWebView(webView)
, m_overlay(0)
, m_observedWindow(0)
, m_showsWhileWebViewIsVisible(false)
{
m_inspectedWebView->viewWindow(&m_inspectedWebViewWindow);
}
WebNodeHighlight::~WebNodeHighlight()
{
if (m_observedWindow)
WindowMessageBroadcaster::removeListener(m_observedWindow, this);
if (m_inspectedWebViewWindow)
WindowMessageBroadcaster::removeListener(m_inspectedWebViewWindow, this);
if (m_overlay)
::DestroyWindow(m_overlay);
}
void WebNodeHighlight::setShowsWhileWebViewIsVisible(bool shows)
{
if (m_showsWhileWebViewIsVisible == shows)
return;
m_showsWhileWebViewIsVisible = shows;
if (!m_showsWhileWebViewIsVisible) {
hide();
return;
}
bool webViewVisible = isWebViewVisible();
if (isShowing() == webViewVisible)
return;
if (webViewVisible)
show();
else
hide();
}
bool WebNodeHighlight::isWebViewVisible() const
{
if (!m_inspectedWebViewWindow)
return false;
return IsWindowVisible(m_inspectedWebViewWindow);
}
void WebNodeHighlight::show()
{
if (!m_overlay) {
registerOverlayClass();
m_overlay = ::CreateWindowEx(WS_EX_LAYERED | WS_EX_TOOLWINDOW | WS_EX_TRANSPARENT, kOverlayWindowClassName, 0, WS_POPUP,
0, 0, 0, 0,
m_inspectedWebViewWindow, 0, 0, 0);
if (!m_overlay)
return;
::SetProp(m_overlay, kWebNodeHighlightPointerProp, reinterpret_cast<HANDLE>(this));
m_observedWindow = GetAncestor(m_inspectedWebViewWindow, GA_ROOT);
WindowMessageBroadcaster::addListener(m_observedWindow, this);
WindowMessageBroadcaster::addListener(m_inspectedWebViewWindow, this);
}
ASSERT(m_showsWhileWebViewIsVisible);
update();
SetWindowPos(m_overlay, 0, 0, 0, 0, 0, SWP_SHOWWINDOW | SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
}
void WebNodeHighlight::hide()
{
if (m_overlay)
::ShowWindow(m_overlay, SW_HIDE);
}
bool WebNodeHighlight::isShowing() const
{
return m_overlay && ::IsWindowVisible(m_overlay);
}
void WebNodeHighlight::update()
{
ASSERT(m_overlay);
auto hdc = adoptGDIObject(::CreateCompatibleDC(HWndDC(m_overlay)));
if (!hdc)
return;
RECT webViewRect;
::GetWindowRect(m_inspectedWebViewWindow, &webViewRect);
SIZE size;
size.cx = webViewRect.right - webViewRect.left;
size.cy = webViewRect.bottom - webViewRect.top;
if (!size.cx || !size.cy)
return;
BitmapInfo bitmapInfo = BitmapInfo::createBottomUp(IntSize(size));
void* pixels = 0;
auto hbmp = adoptGDIObject(::CreateDIBSection(hdc.get(), &bitmapInfo, DIB_RGB_COLORS, &pixels, 0, 0));
ASSERT_WITH_MESSAGE(hbmp, "::CreateDIBSection failed with error %lu", ::GetLastError());
::SelectObject(hdc.get(), hbmp.get());
GraphicsContextWin context(hdc.get());
context.scale(m_inspectedWebView->page()->deviceScaleFactor());
m_inspectedWebView->page()->inspectorController().drawHighlight(context);
BLENDFUNCTION bf;
bf.BlendOp = AC_SRC_OVER;
bf.BlendFlags = 0;
bf.SourceConstantAlpha = 255;
bf.AlphaFormat = AC_SRC_ALPHA;
POINT srcPoint;
srcPoint.x = 0;
srcPoint.y = 0;
POINT dstPoint;
dstPoint.x = webViewRect.left;
dstPoint.y = webViewRect.top;
::UpdateLayeredWindow(m_overlay, HWndDC(0), &dstPoint, &size, hdc.get(), &srcPoint, 0, &bf, ULW_ALPHA);
}
void WebNodeHighlight::placeBehindWindow(HWND window)
{
ASSERT(m_overlay);
SetWindowPos(m_overlay, window, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
}
static ATOM registerOverlayClass()
{
static bool haveRegisteredWindowClass = false;
if (haveRegisteredWindowClass)
return true;
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = 0;
wcex.lpfnWndProc = OverlayWndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = 0;
wcex.hIcon = 0;
wcex.hCursor = LoadCursor(0, IDC_ARROW);
wcex.hbrBackground = 0;
wcex.lpszMenuName = 0;
wcex.lpszClassName = kOverlayWindowClassName;
wcex.hIconSm = 0;
haveRegisteredWindowClass = true;
return ::RegisterClassEx(&wcex);
}
LRESULT CALLBACK OverlayWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
WebNodeHighlight* highlight = reinterpret_cast<WebNodeHighlight*>(::GetProp(hwnd, kWebNodeHighlightPointerProp));
if (!highlight)
return ::DefWindowProc(hwnd, msg, wParam, lParam);
return ::DefWindowProc(hwnd, msg, wParam, lParam);
}
void WebNodeHighlight::onWebViewShowWindow(bool showing)
{
if (!m_showsWhileWebViewIsVisible)
return;
if (isShowing() == showing)
return;
if (showing)
show();
else
hide();
}
void WebNodeHighlight::onWebViewWindowPosChanged(WINDOWPOS* windowPos)
{
bool sizing = !(windowPos->flags & SWP_NOSIZE);
if (!sizing)
return;
if (!isShowing())
return;
update();
}
void WebNodeHighlight::onRootWindowPosChanged(WINDOWPOS* windowPos)
{
bool moving = !(windowPos->flags & SWP_NOMOVE);
bool sizing = !(windowPos->flags & SWP_NOSIZE);
if (!moving)
return;
// Size changes are handled by onWebViewWindowPosChanged.
if (sizing)
return;
if (!isShowing())
return;
update();
}
void WebNodeHighlight::windowReceivedMessage(HWND window, UINT msg, WPARAM wParam, LPARAM lParam)
{
if (window == m_inspectedWebViewWindow) {
switch (msg) {
case WM_SHOWWINDOW:
onWebViewShowWindow(wParam);
break;
case WM_WINDOWPOSCHANGED:
onWebViewWindowPosChanged(reinterpret_cast<WINDOWPOS*>(lParam));
break;
default:
break;
}
return;
}
ASSERT(window == m_observedWindow);
switch (msg) {
case WM_WINDOWPOSCHANGED:
onRootWindowPosChanged(reinterpret_cast<WINDOWPOS*>(lParam));
break;
default:
break;
}
}