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/*
* Copyright (C) 2007-2022 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.
*
* 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 "config.h"
#include "DragController.h"
#include "HTMLAnchorElement.h"
#include "SVGAElement.h"
#include "SVGElementTypeHelpers.h"
#if ENABLE(DRAG_SUPPORT)
#include "CachedImage.h"
#include "CachedResourceLoader.h"
#include "ColorSerialization.h"
#include "DataTransfer.h"
#include "Document.h"
#include "DocumentFragment.h"
#include "DragActions.h"
#include "DragClient.h"
#include "DragData.h"
#include "DragImage.h"
#include "DragState.h"
#include "Editing.h"
#include "Editor.h"
#include "EditorClient.h"
#include "ElementAncestorIterator.h"
#include "EventHandler.h"
#include "EventLoop.h"
#include "File.h"
#include "FloatRect.h"
#include "FocusController.h"
#include "Frame.h"
#include "FrameLoadRequest.h"
#include "FrameLoader.h"
#include "FrameSelection.h"
#include "FrameView.h"
#include "HTMLAttachmentElement.h"
#include "HTMLImageElement.h"
#include "HTMLInputElement.h"
#include "HTMLModelElement.h"
#include "HTMLParserIdioms.h"
#include "HTMLPlugInElement.h"
#include "HitTestRequest.h"
#include "HitTestResult.h"
#include "Image.h"
#include "ImageOrientation.h"
#include "ImageOverlay.h"
#include "Model.h"
#include "MoveSelectionCommand.h"
#include "Page.h"
#include "Pasteboard.h"
#include "PlatformKeyboardEvent.h"
#include "PluginDocument.h"
#include "PluginViewBase.h"
#include "Position.h"
#include "PromisedAttachmentInfo.h"
#include "Range.h"
#include "RenderAttachment.h"
#include "RenderFileUploadControl.h"
#include "RenderImage.h"
#include "RenderView.h"
#include "ReplaceSelectionCommand.h"
#include "ResourceRequest.h"
#include "SecurityOrigin.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "SimpleRange.h"
#include "StyleProperties.h"
#include "Text.h"
#include "TextEvent.h"
#include "VisiblePosition.h"
#include "WebContentReader.h"
#include "markup.h"
#include <wtf/SetForScope.h>
#endif
#if ENABLE(DATA_DETECTION)
#include "DataDetection.h"
#endif
#if PLATFORM(IOS_FAMILY)
#include "SelectionGeometry.h"
#endif
namespace WebCore {
bool isDraggableLink(const Element& element)
{
if (is<HTMLAnchorElement>(element)) {
auto& anchorElement = downcast<HTMLAnchorElement>(element);
if (!anchorElement.isLiveLink())
return false;
#if ENABLE(DATA_DETECTION)
return !DataDetection::isDataDetectorURL(anchorElement.href());
#else
return true;
#endif
}
if (is<SVGAElement>(element))
return element.isLink();
return false;
}
#if ENABLE(DRAG_SUPPORT)
static PlatformMouseEvent createMouseEvent(const DragData& dragData)
{
bool shiftKey = false;
bool ctrlKey = false;
bool altKey = false;
bool metaKey = false;
PlatformKeyboardEvent::getCurrentModifierState(shiftKey, ctrlKey, altKey, metaKey);
return PlatformMouseEvent(dragData.clientPosition(), dragData.globalPosition(),
LeftButton, PlatformEvent::MouseMoved, 0, shiftKey, ctrlKey, altKey,
metaKey, WallTime::now(), ForceAtClick, NoTap);
}
DragController::DragController(Page& page, std::unique_ptr<DragClient>&& client)
: m_page(page)
, m_client(WTFMove(client))
{
}
DragController::~DragController() = default;
static RefPtr<DocumentFragment> documentFragmentFromDragData(const DragData& dragData, Frame& frame, const SimpleRange& context, bool allowPlainText, bool& chosePlainText)
{
chosePlainText = false;
if (dragData.containsCompatibleContent()) {
if (auto fragment = frame.editor().webContentFromPasteboard(*Pasteboard::create(dragData), context, allowPlainText, chosePlainText))
return fragment;
if (dragData.containsURL(DragData::DoNotConvertFilenames)) {
String title;
String url = dragData.asURL(DragData::DoNotConvertFilenames, &title);
if (!url.isEmpty()) {
auto& document = context.start.document();
auto anchor = HTMLAnchorElement::create(document);
anchor->setHref(AtomString { url });
if (title.isEmpty()) {
// Try the plain text first because the URL might be normalized or escaped.
if (dragData.containsPlainText())
title = dragData.asPlainText();
if (title.isEmpty())
title = url;
}
anchor->appendChild(document.createTextNode(WTFMove(title)));
auto fragment = document.createDocumentFragment();
fragment->appendChild(anchor);
return fragment;
}
}
}
if (allowPlainText && dragData.containsPlainText()) {
chosePlainText = true;
return createFragmentFromText(context, dragData.asPlainText()).ptr();
}
return nullptr;
}
#if !PLATFORM(IOS_FAMILY)
DragOperation DragController::platformGenericDragOperation()
{
return DragOperation::Move;
}
#endif
bool DragController::dragIsMove(FrameSelection& selection, const DragData& dragData)
{
const VisibleSelection& visibleSelection = selection.selection();
return m_documentUnderMouse == m_dragInitiator && visibleSelection.isContentEditable() && visibleSelection.isRange() && !isCopyKeyDown(dragData);
}
void DragController::clearDragCaret()
{
m_page.dragCaretController().clear();
}
void DragController::dragEnded()
{
m_dragInitiator = nullptr;
m_didInitiateDrag = false;
m_documentUnderMouse = nullptr;
clearDragCaret();
removeAllDroppedImagePlaceholders();
client().dragEnded();
}
std::optional<DragOperation> DragController::dragEntered(const DragData& dragData)
{
return dragEnteredOrUpdated(dragData);
}
void DragController::dragExited(const DragData& dragData)
{
auto& mainFrame = m_page.mainFrame();
if (mainFrame.view())
mainFrame.eventHandler().cancelDragAndDrop(createMouseEvent(dragData), Pasteboard::create(dragData), dragData.draggingSourceOperationMask(), dragData.containsFiles());
mouseMovedIntoDocument(nullptr);
if (m_fileInputElementUnderMouse)
m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false);
m_fileInputElementUnderMouse = nullptr;
}
std::optional<DragOperation> DragController::dragUpdated(const DragData& dragData)
{
return dragEnteredOrUpdated(dragData);
}
inline static bool dragIsHandledByDocument(DragHandlingMethod dragHandlingMethod)
{
return dragHandlingMethod != DragHandlingMethod::None && dragHandlingMethod != DragHandlingMethod::PageLoad;
}
bool DragController::performDragOperation(const DragData& dragData)
{
if (!m_droppedImagePlaceholders.isEmpty() && m_droppedImagePlaceholderRange && tryToUpdateDroppedImagePlaceholders(dragData)) {
m_droppedImagePlaceholders.clear();
m_droppedImagePlaceholderRange = std::nullopt;
m_documentUnderMouse = nullptr;
clearDragCaret();
return true;
}
removeAllDroppedImagePlaceholders();
SetForScope isPerformingDrop(m_isPerformingDrop, true);
IgnoreSelectionChangeForScope ignoreSelectionChanges { m_page.focusController().focusedOrMainFrame() };
m_documentUnderMouse = m_page.mainFrame().documentAtPoint(dragData.clientPosition());
ShouldOpenExternalURLsPolicy shouldOpenExternalURLsPolicy = ShouldOpenExternalURLsPolicy::ShouldNotAllow;
if (m_documentUnderMouse)
shouldOpenExternalURLsPolicy = m_documentUnderMouse->shouldOpenExternalURLsPolicyToPropagate();
if ((m_dragDestinationActionMask.contains(DragDestinationAction::DHTML)) && dragIsHandledByDocument(m_dragHandlingMethod)) {
client().willPerformDragDestinationAction(DragDestinationAction::DHTML, dragData);
Ref<Frame> mainFrame(m_page.mainFrame());
bool preventedDefault = false;
if (mainFrame->view())
preventedDefault = mainFrame->eventHandler().performDragAndDrop(createMouseEvent(dragData), Pasteboard::create(dragData), dragData.draggingSourceOperationMask(), dragData.containsFiles());
if (preventedDefault) {
clearDragCaret();
m_documentUnderMouse = nullptr;
return true;
}
}
if ((m_dragDestinationActionMask.contains(DragDestinationAction::Edit)) && concludeEditDrag(dragData)) {
client().didConcludeEditDrag();
m_documentUnderMouse = nullptr;
clearDragCaret();
return true;
}
m_documentUnderMouse = nullptr;
clearDragCaret();
if (!operationForLoad(dragData))
return false;
auto urlString = dragData.asURL();
if (urlString.isEmpty())
return false;
client().willPerformDragDestinationAction(DragDestinationAction::Load, dragData);
ResourceRequest resourceRequest { urlString };
resourceRequest.setIsAppInitiated(false);
FrameLoadRequest frameLoadRequest { m_page.mainFrame(), resourceRequest };
frameLoadRequest.setShouldOpenExternalURLsPolicy(shouldOpenExternalURLsPolicy);
frameLoadRequest.setIsRequestFromClientOrUserInput();
m_page.mainFrame().loader().load(WTFMove(frameLoadRequest));
return true;
}
void DragController::mouseMovedIntoDocument(Document* newDocument)
{
if (m_documentUnderMouse == newDocument)
return;
// If we were over another document clear the selection
if (m_documentUnderMouse)
clearDragCaret();
m_documentUnderMouse = newDocument;
}
std::optional<DragOperation> DragController::dragEnteredOrUpdated(const DragData& dragData)
{
mouseMovedIntoDocument(m_page.mainFrame().documentAtPoint(dragData.clientPosition()));
m_dragDestinationActionMask = dragData.dragDestinationActionMask();
if (m_dragDestinationActionMask.isEmpty()) {
clearDragCaret(); // FIXME: Why not call mouseMovedIntoDocument(nullptr)?
return std::nullopt;
}
std::optional<DragOperation> dragOperation;
m_dragHandlingMethod = tryDocumentDrag(dragData, m_dragDestinationActionMask, dragOperation);
if (m_dragHandlingMethod == DragHandlingMethod::None && (m_dragDestinationActionMask.contains(DragDestinationAction::Load))) {
dragOperation = operationForLoad(dragData);
if (dragOperation)
m_dragHandlingMethod = DragHandlingMethod::PageLoad;
} else if (m_dragHandlingMethod == DragHandlingMethod::SetColor)
dragOperation = DragOperation::Copy;
updateSupportedTypeIdentifiersForDragHandlingMethod(m_dragHandlingMethod, dragData);
return dragOperation;
}
static HTMLInputElement* asFileInput(Node& node)
{
if (!is<HTMLInputElement>(node))
return nullptr;
auto* inputElement = &downcast<HTMLInputElement>(node);
// If this is a button inside of the a file input, move up to the file input.
if (inputElement->isTextButton())
inputElement = dynamicDowncast<HTMLInputElement>(inputElement->shadowHost());
return inputElement && inputElement->isFileUpload() ? inputElement : nullptr;
}
#if ENABLE(INPUT_TYPE_COLOR)
static bool isEnabledColorInput(Node& node)
{
if (!is<HTMLInputElement>(node))
return false;
auto& input = downcast<HTMLInputElement>(node);
return input.isColorControl() && !input.isDisabledFormControl();
}
static bool isInShadowTreeOfEnabledColorInput(Node& node)
{
auto* host = node.shadowHost();
return host && isEnabledColorInput(*host);
}
#endif
// This can return null if an empty document is loaded.
static Element* elementUnderMouse(Document* documentUnderMouse, const IntPoint& p)
{
Frame* frame = documentUnderMouse->frame();
float zoomFactor = frame ? frame->pageZoomFactor() : 1;
LayoutPoint point(p.x() * zoomFactor, p.y() * zoomFactor);
HitTestResult result(point);
documentUnderMouse->hitTest(HitTestRequest(), result);
auto* node = result.innerNode();
if (!node)
return nullptr;
// FIXME: Use parentElementInComposedTree here.
auto* element = is<Element>(*node) ? &downcast<Element>(*node) : node->parentElement();
auto* host = element->shadowHost();
return host ? host : element;
}
#if !PLATFORM(IOS_FAMILY)
void DragController::updateSupportedTypeIdentifiersForDragHandlingMethod(DragHandlingMethod, const DragData&) const
{
}
#endif
DragHandlingMethod DragController::tryDocumentDrag(const DragData& dragData, OptionSet<DragDestinationAction> destinationActionMask, std::optional<DragOperation>& dragOperation)
{
if (!m_documentUnderMouse)
return DragHandlingMethod::None;
if (m_dragInitiator && !m_documentUnderMouse->securityOrigin().canReceiveDragData(m_dragInitiator->securityOrigin()))
return DragHandlingMethod::None;
bool isHandlingDrag = false;
if (destinationActionMask.contains(DragDestinationAction::DHTML)) {
isHandlingDrag = tryDHTMLDrag(dragData, dragOperation);
// Do not continue if m_documentUnderMouse has been reset by tryDHTMLDrag.
// tryDHTMLDrag fires dragenter event. The event listener that listens
// to this event may create a nested message loop (open a modal dialog),
// which could process dragleave event and reset m_documentUnderMouse in
// dragExited.
if (!m_documentUnderMouse)
return DragHandlingMethod::None;
}
// It's unclear why this check is after tryDHTMLDrag.
// We send drag events in tryDHTMLDrag and that may be the reason.
RefPtr<FrameView> frameView = m_documentUnderMouse->view();
if (!frameView)
return DragHandlingMethod::None;
if (isHandlingDrag) {
clearDragCaret();
m_numberOfItemsToBeAccepted = dragData.numberOfFiles();
return DragHandlingMethod::NonDefault;
}
if (destinationActionMask.contains(DragDestinationAction::Edit) && canProcessDrag(dragData)) {
if (dragData.containsColor()) {
dragOperation = DragOperation::Generic;
return DragHandlingMethod::SetColor;
}
IntPoint point = frameView->windowToContents(dragData.clientPosition());
Element* element = elementUnderMouse(m_documentUnderMouse.get(), point);
if (!element)
return DragHandlingMethod::None;
HTMLInputElement* elementAsFileInput = asFileInput(*element);
if (m_fileInputElementUnderMouse != elementAsFileInput) {
if (m_fileInputElementUnderMouse)
m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false);
m_fileInputElementUnderMouse = elementAsFileInput;
}
if (!m_fileInputElementUnderMouse)
m_page.dragCaretController().setCaretPosition(m_documentUnderMouse->frame()->visiblePositionForPoint(point));
else
clearDragCaret();
Frame* innerFrame = element->document().frame();
dragOperation = dragIsMove(innerFrame->selection(), dragData) ? DragOperation::Move : DragOperation::Copy;
unsigned numberOfFiles = dragData.numberOfFiles();
if (m_fileInputElementUnderMouse) {
if (m_fileInputElementUnderMouse->isDisabledFormControl())
m_numberOfItemsToBeAccepted = 0;
else if (m_fileInputElementUnderMouse->multiple())
m_numberOfItemsToBeAccepted = numberOfFiles;
else if (numberOfFiles > 1)
m_numberOfItemsToBeAccepted = 0;
else
m_numberOfItemsToBeAccepted = 1;
if (!m_numberOfItemsToBeAccepted)
dragOperation = std::nullopt;
m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(m_numberOfItemsToBeAccepted);
} else {
// We are not over a file input element. The dragged item(s) will loaded into the view,
// dropped as text paths on other input elements, or handled by script on the page.
m_numberOfItemsToBeAccepted = numberOfFiles;
}
if (m_fileInputElementUnderMouse)
return DragHandlingMethod::UploadFile;
if (m_page.dragCaretController().isContentRichlyEditable())
return DragHandlingMethod::EditRichText;
return DragHandlingMethod::EditPlainText;
}
// We are not over an editable region. Make sure we're clearing any prior drag cursor.
clearDragCaret();
if (m_fileInputElementUnderMouse)
m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false);
m_fileInputElementUnderMouse = nullptr;
return DragHandlingMethod::None;
}
OptionSet<DragSourceAction> DragController::delegateDragSourceAction(const IntPoint& rootViewPoint)
{
m_dragSourceAction = client().dragSourceActionMaskForPoint(rootViewPoint);
return m_dragSourceAction;
}
std::optional<DragOperation> DragController::operationForLoad(const DragData& dragData)
{
Document* document = m_page.mainFrame().documentAtPoint(dragData.clientPosition());
bool pluginDocumentAcceptsDrags = false;
if (auto* pluginDocument = dynamicDowncast<PluginDocument>(document)) {
if (auto* pluginView = pluginDocument->pluginWidget())
pluginDocumentAcceptsDrags = pluginView->shouldAllowNavigationFromDrags();
}
if (document && (m_didInitiateDrag || (is<PluginDocument>(*document) && !pluginDocumentAcceptsDrags) || document->hasEditableStyle()))
return std::nullopt;
return dragOperation(dragData);
}
static bool setSelectionToDragCaret(Frame* frame, VisibleSelection& dragCaret, const IntPoint& point)
{
Ref<Frame> protector(*frame);
frame->selection().setSelection(dragCaret);
if (frame->selection().selection().isNone()) {
dragCaret = frame->visiblePositionForPoint(point);
frame->selection().setSelection(dragCaret);
}
return !frame->selection().isNone() && frame->selection().selection().isContentEditable();
}
bool DragController::dispatchTextInputEventFor(Frame* innerFrame, const DragData& dragData)
{
ASSERT(m_page.dragCaretController().hasCaret());
String text = m_page.dragCaretController().isContentRichlyEditable() ? emptyString() : dragData.asPlainText();
auto target = innerFrame->editor().findEventTargetFrom(m_page.dragCaretController().caretPosition());
// FIXME: What guarantees target is not null?
auto event = TextEvent::createForDrop(&innerFrame->windowProxy(), text);
target->dispatchEvent(event);
return !event->defaultPrevented();
}
bool DragController::concludeEditDrag(const DragData& dragData)
{
RefPtr<HTMLInputElement> fileInput = m_fileInputElementUnderMouse;
if (m_fileInputElementUnderMouse) {
m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false);
m_fileInputElementUnderMouse = nullptr;
}
if (!m_documentUnderMouse)
return false;
IntPoint point = m_documentUnderMouse->view()->windowToContents(dragData.clientPosition());
Element* element = elementUnderMouse(m_documentUnderMouse.get(), point);
if (!element)
return false;
RefPtr<Frame> innerFrame = element->document().frame();
ASSERT(innerFrame);
if (m_page.dragCaretController().hasCaret() && !dispatchTextInputEventFor(innerFrame.get(), dragData))
return true;
if (dragData.containsColor()) {
Color color = dragData.asColor();
if (!color.isValid())
return false;
#if ENABLE(INPUT_TYPE_COLOR)
if (isEnabledColorInput(*element)) {
auto& input = downcast<HTMLInputElement>(*element);
input.setValue(serializationForHTML(color), DispatchInputAndChangeEvent);
return true;
}
#endif
auto innerRange = innerFrame->selection().selection().toNormalizedRange();
if (!innerRange)
return false;
auto style = MutableStyleProperties::create();
style->setProperty(CSSPropertyColor, serializationForHTML(color), false);
if (!innerFrame->editor().shouldApplyStyle(style, *innerRange))
return false;
client().willPerformDragDestinationAction(DragDestinationAction::Edit, dragData);
innerFrame->editor().applyStyle(style.ptr(), EditAction::SetColor);
return true;
}
if (dragData.containsFiles() && fileInput) {
// fileInput should be the element we hit tested for, unless it was made
// display:none in a drop event handler.
ASSERT(fileInput == element || !fileInput->renderer());
if (fileInput->isDisabledFormControl())
return false;
return fileInput->receiveDroppedFiles(dragData);
}
if (!m_page.dragController().canProcessDrag(dragData))
return false;
VisibleSelection dragCaret = m_page.dragCaretController().caretPosition();
auto range = dragCaret.toNormalizedRange();
RefPtr<Element> rootEditableElement = innerFrame->selection().selection().rootEditableElement();
// For range to be null a WebKit client must have done something bad while
// manually controlling drag behaviour
if (!range)
return false;
ResourceCacheValidationSuppressor validationSuppressor(range->start.document().cachedResourceLoader());
auto& editor = innerFrame->editor();
bool isMove = dragIsMove(innerFrame->selection(), dragData);
if (isMove || dragCaret.isContentRichlyEditable()) {
bool chosePlainText = false;
auto fragment = documentFragmentFromDragData(dragData, *innerFrame, *range, true, chosePlainText);
if (!fragment || !editor.shouldInsertFragment(*fragment, range, EditorInsertAction::Dropped))
return false;
client().willPerformDragDestinationAction(DragDestinationAction::Edit, dragData);
if (editor.client() && editor.client()->performTwoStepDrop(*fragment, *range, isMove))
return true;
if (isMove) {
// NSTextView behavior is to always smart delete on moving a selection,
// but only to smart insert if the selection granularity is word granularity.
bool smartDelete = editor.smartInsertDeleteEnabled();
bool smartInsert = smartDelete && innerFrame->selection().granularity() == TextGranularity::WordGranularity && dragData.canSmartReplace();
MoveSelectionCommand::create(fragment.releaseNonNull(), dragCaret.base(), smartInsert, smartDelete)->apply();
} else {
if (setSelectionToDragCaret(innerFrame.get(), dragCaret, point)) {
OptionSet<ReplaceSelectionCommand::CommandOption> options { ReplaceSelectionCommand::SelectReplacement, ReplaceSelectionCommand::PreventNesting };
if (dragData.canSmartReplace())
options.add(ReplaceSelectionCommand::SmartReplace);
if (chosePlainText)
options.add(ReplaceSelectionCommand::MatchStyle);
ReplaceSelectionCommand::create(*m_documentUnderMouse, fragment.releaseNonNull(), options, EditAction::InsertFromDrop)->apply();
}
}
} else {
String text = dragData.asPlainText();
if (text.isEmpty() || !editor.shouldInsertText(text, *range, EditorInsertAction::Dropped))
return false;
client().willPerformDragDestinationAction(DragDestinationAction::Edit, dragData);
auto fragment = createFragmentFromText(*range, text);
if (editor.client() && editor.client()->performTwoStepDrop(fragment.get(), *range, isMove))
return true;
if (setSelectionToDragCaret(innerFrame.get(), dragCaret, point))
ReplaceSelectionCommand::create(*m_documentUnderMouse, WTFMove(fragment), { ReplaceSelectionCommand::SelectReplacement, ReplaceSelectionCommand::MatchStyle, ReplaceSelectionCommand::PreventNesting }, EditAction::InsertFromDrop)->apply();
}
if (rootEditableElement) {
if (Frame* frame = rootEditableElement->document().frame())
frame->eventHandler().updateDragStateAfterEditDragIfNeeded(*rootEditableElement);
}
return true;
}
bool DragController::canProcessDrag(const DragData& dragData)
{
IntPoint point = m_page.mainFrame().view()->windowToContents(dragData.clientPosition());
HitTestResult result = HitTestResult(point);
if (!m_page.mainFrame().contentRenderer())
return false;
constexpr OptionSet<HitTestRequest::Type> hitType { HitTestRequest::Type::ReadOnly, HitTestRequest::Type::Active, HitTestRequest::Type::AllowChildFrameContent };
result = m_page.mainFrame().eventHandler().hitTestResultAtPoint(point, hitType);
auto* dragNode = result.innerNonSharedNode();
if (!dragNode)
return false;
DragData::DraggingPurpose dragPurpose = DragData::DraggingPurpose::ForEditing;
if (asFileInput(*dragNode))
dragPurpose = DragData::DraggingPurpose::ForFileUpload;
#if ENABLE(INPUT_TYPE_COLOR)
else if (isEnabledColorInput(*dragNode) || isInShadowTreeOfEnabledColorInput(*dragNode))
dragPurpose = DragData::DraggingPurpose::ForColorControl;
#endif
if (!dragData.containsCompatibleContent(dragPurpose))
return false;
if (dragPurpose == DragData::DraggingPurpose::ForFileUpload)
return true;
#if ENABLE(INPUT_TYPE_COLOR)
if (dragPurpose == DragData::DraggingPurpose::ForColorControl)
return true;
#endif
if (!dragNode->hasEditableStyle())
return false;
if (m_didInitiateDrag && m_documentUnderMouse == m_dragInitiator && result.isSelected())
return false;
return true;
}
static std::optional<DragOperation> defaultOperationForDrag(OptionSet<DragOperation> sourceOperationMask)
{
// This is designed to match IE's operation fallback for the case where
// the page calls preventDefault() in a drag event but doesn't set dropEffect.
if (sourceOperationMask.containsAll({ DragOperation::Copy, DragOperation::Link, DragOperation::Generic, DragOperation::Private, DragOperation::Move, DragOperation::Delete }))
return DragOperation::Copy;
if (sourceOperationMask.isEmpty())
return std::nullopt;
if (sourceOperationMask.contains(DragOperation::Move))
return DragOperation::Move;
if (sourceOperationMask.contains(DragOperation::Generic))
return DragController::platformGenericDragOperation();
if (sourceOperationMask.contains(DragOperation::Copy))
return DragOperation::Copy;
if (sourceOperationMask.contains(DragOperation::Link))
return DragOperation::Link;
// FIXME: Does IE really return "generic" even if no operations were allowed by the source?
return DragOperation::Generic;
}
bool DragController::tryDHTMLDrag(const DragData& dragData, std::optional<DragOperation>& operation)
{
ASSERT(m_documentUnderMouse);
Ref<Frame> mainFrame(m_page.mainFrame());
RefPtr<FrameView> viewProtector = mainFrame->view();
if (!viewProtector)
return false;
auto sourceOperationMask = dragData.draggingSourceOperationMask();
auto targetResponse = mainFrame->eventHandler().updateDragAndDrop(createMouseEvent(dragData), [&dragData]() {
return Pasteboard::create(dragData);
}, sourceOperationMask, dragData.containsFiles());
if (!targetResponse.accept)
return false;
if (!targetResponse.operationMask)
operation = defaultOperationForDrag(sourceOperationMask);
else if (!sourceOperationMask.containsAny(targetResponse.operationMask.value())) // The element picked an operation which is not supported by the source.
operation = std::nullopt;
else
operation = defaultOperationForDrag(targetResponse.operationMask.value());
return true;
}
static bool imageElementIsDraggable(const HTMLImageElement& image, const Frame& sourceFrame)
{
if (sourceFrame.settings().loadsImagesAutomatically())
return true;
auto* renderer = image.renderer();
if (!is<RenderImage>(renderer))
return false;
auto* cachedImage = downcast<RenderImage>(*renderer).cachedImage();
return cachedImage && !cachedImage->errorOccurred() && cachedImage->imageForRenderer(renderer);
}
#if ENABLE(MODEL_ELEMENT)
static bool modelElementIsDraggable(const HTMLModelElement& modelElement)
{
return modelElement.supportsDragging() && !!modelElement.model();
}
#endif
#if ENABLE(ATTACHMENT_ELEMENT)
static RefPtr<HTMLAttachmentElement> enclosingAttachmentElement(Element& element)
{
if (is<HTMLAttachmentElement>(element))
return downcast<HTMLAttachmentElement>(&element);
if (is<HTMLAttachmentElement>(element.parentOrShadowHostElement()))
return downcast<HTMLAttachmentElement>(element.parentOrShadowHostElement());
return { };
}
#endif
Element* DragController::draggableElement(const Frame* sourceFrame, Element* startElement, const IntPoint& dragOrigin, DragState& state) const
{
state.type = sourceFrame->selection().contains(dragOrigin) ? DragSourceAction::Selection : OptionSet<DragSourceAction>({ });
if (!startElement)
return nullptr;
#if ENABLE(ATTACHMENT_ELEMENT)
if (auto attachment = enclosingAttachmentElement(*startElement)) {
auto& selection = sourceFrame->selection().selection();
bool isSingleAttachmentSelection = selection.start() == Position(attachment.get(), Position::PositionIsBeforeAnchor) && selection.end() == Position(attachment.get(), Position::PositionIsAfterAnchor);
auto* renderer = attachment->renderer();
if (!renderer || renderer->style().userDrag() == UserDrag::None)
return nullptr;
auto selectedRange = selection.firstRange();
if (isSingleAttachmentSelection || !selectedRange || !contains<ComposedTree>(*selectedRange, *attachment)) {
state.type = DragSourceAction::Attachment;
return attachment.get();
}
}
#endif // ENABLE(ATTACHMENT_ELEMENT)
auto selectionDragElement = state.type.contains(DragSourceAction::Selection) && m_dragSourceAction.contains(DragSourceAction::Selection) ? startElement : nullptr;
if (ImageOverlay::isOverlayText(startElement))
return selectionDragElement;
for (auto* element = startElement; element; element = element->parentOrShadowHostElement()) {
auto* renderer = element->renderer();
if (!renderer)
continue;
UserDrag dragMode = renderer->style().userDrag();
if (m_dragSourceAction.contains(DragSourceAction::DHTML) && dragMode == UserDrag::Element) {
state.type = DragSourceAction::DHTML;
return element;
}
if (dragMode == UserDrag::Auto) {
if ((m_dragSourceAction.contains(DragSourceAction::Image))
&& is<HTMLImageElement>(*element)
&& imageElementIsDraggable(downcast<HTMLImageElement>(*element), *sourceFrame)) {
state.type.add(DragSourceAction::Image);
return element;
}
if (m_dragSourceAction.contains(DragSourceAction::Link) && isDraggableLink(*element)) {
state.type.add(DragSourceAction::Link);
return element;
}
#if ENABLE(ATTACHMENT_ELEMENT)
if (m_dragSourceAction.contains(DragSourceAction::Attachment)
&& is<HTMLAttachmentElement>(*element)
&& downcast<HTMLAttachmentElement>(*element).file()) {
state.type.add(DragSourceAction::Attachment);
return element;
}
#endif
#if ENABLE(INPUT_TYPE_COLOR)
if (m_dragSourceAction.contains(DragSourceAction::Color) && isEnabledColorInput(*element)) {
state.type.add(DragSourceAction::Color);
return element;
}
#endif
#if ENABLE(MODEL_ELEMENT)
if (m_dragSourceAction.contains(DragSourceAction::Model) && is<HTMLModelElement>(*element) && modelElementIsDraggable(downcast<HTMLModelElement>(*element))) {
state.type.add(DragSourceAction::Model);
return element;
}
#endif
}
}
// We either have nothing to drag or we have a selection and we're not over a draggable element.
return selectionDragElement;
}
static CachedImage* getCachedImage(Element& element)
{
RenderObject* renderer = element.renderer();
if (!is<RenderImage>(renderer))
return nullptr;
auto& image = downcast<RenderImage>(*renderer);
return image.cachedImage();
}
static Image* getImage(Element& element)
{
CachedImage* cachedImage = getCachedImage(element);
// Don't use cachedImage->imageForRenderer() here as that may return BitmapImages for cached SVG Images.
// Users of getImage() want access to the SVGImage, in order to figure out the filename extensions,
// which would be empty when asking the cached BitmapImages.
return (cachedImage && !cachedImage->errorOccurred()) ?
cachedImage->image() : nullptr;
}
static void selectElement(Element& element)
{
if (auto frame = element.document().frame()) {
if (auto range = makeRangeSelectingNode(element))
frame->selection().setSelection(*range);
}
}
static IntPoint dragLocForDHTMLDrag(const IntPoint& mouseDraggedPoint, const IntPoint& dragOrigin, const IntPoint& dragImageOffset, bool isLinkImage)
{
// dragImageOffset is the cursor position relative to the lower-left corner of the image.
#if PLATFORM(MAC)
// We add in the Y dimension because we are a flipped view, so adding moves the image down.
const int yOffset = dragImageOffset.y();
#else
const int yOffset = -dragImageOffset.y();
#endif
if (isLinkImage)
return IntPoint(mouseDraggedPoint.x() - dragImageOffset.x(), mouseDraggedPoint.y() + yOffset);
return IntPoint(dragOrigin.x() - dragImageOffset.x(), dragOrigin.y() + yOffset);
}
static FloatPoint dragImageAnchorPointForSelectionDrag(Frame& frame, const IntPoint& mouseDraggedPoint)
{
IntRect draggingRect = enclosingIntRect(frame.selection().selectionBounds());
float x = (mouseDraggedPoint.x() - draggingRect.x()) / (float)draggingRect.width();
float y = (mouseDraggedPoint.y() - draggingRect.y()) / (float)draggingRect.height();
return FloatPoint { x, y };
}
static IntPoint dragLocForSelectionDrag(Frame& src)
{
IntRect draggingRect = enclosingIntRect(src.selection().selectionBounds());
int xpos = draggingRect.maxX();
xpos = draggingRect.x() < xpos ? draggingRect.x() : xpos;
int ypos = draggingRect.maxY();
#if PLATFORM(COCOA)
// Deal with flipped coordinates on Mac
ypos = draggingRect.y() > ypos ? draggingRect.y() : ypos;
#else
ypos = draggingRect.y() < ypos ? draggingRect.y() : ypos;
#endif
return IntPoint(xpos, ypos);
}
void DragController::prepareForDragStart(Frame& source, OptionSet<DragSourceAction> actionMask, Element& element, DataTransfer& dataTransfer, const IntPoint& dragOrigin) const
{
#if !PLATFORM(WIN)
Ref<Frame> protector(source);
auto hitTestResult = hitTestResultForDragStart(source, element, dragOrigin);
if (!hitTestResult)
return;
auto& pasteboard = dataTransfer.pasteboard();
auto& editor = source.editor();
if (actionMask == DragSourceAction::Selection) {
if (enclosingTextFormControl(source.selection().selection().start()))
pasteboard.writePlainText(editor.selectedTextForDataTransfer(), Pasteboard::CannotSmartReplace);
else
editor.writeSelectionToPasteboard(pasteboard);
return;
}
auto* image = getImage(element);
auto imageURL = hitTestResult->absoluteImageURL();
if (actionMask.contains(DragSourceAction::Image) && !imageURL.isEmpty() && image && !image->isNull()) {
editor.writeImageToPasteboard(pasteboard, element, imageURL, { });
return;
}
auto linkURL = hitTestResult->absoluteLinkURL();
if (actionMask.contains(DragSourceAction::Link) && !linkURL.isEmpty() && source.document()->securityOrigin().canDisplay(linkURL))
editor.copyURL(linkURL, hitTestResult->textContent().simplifyWhiteSpace(), pasteboard);
#else
// FIXME: Make this work on Windows by implementing Editor::writeSelectionToPasteboard and Editor::writeImageToPasteboard.
UNUSED_PARAM(source);
UNUSED_PARAM(actionMask);
UNUSED_PARAM(element);
UNUSED_PARAM(dataTransfer);
UNUSED_PARAM(dragOrigin);
#endif
}
std::optional<HitTestResult> DragController::hitTestResultForDragStart(Frame& source, Element& element, const IntPoint& location) const
{
if (!source.view() || !source.contentRenderer())
return std::nullopt;
constexpr OptionSet<HitTestRequest::Type> hitType { HitTestRequest::Type::ReadOnly, HitTestRequest::Type::Active, HitTestRequest::Type::AllowChildFrameContent };
auto hitTestResult = source.eventHandler().hitTestResultAtPoint(location, hitType);
bool sourceContainsHitNode = element.containsIncludingShadowDOM(hitTestResult.innerNode());
if (!sourceContainsHitNode) {
// The original node being dragged isn't under the drag origin anymore... maybe it was
// hidden or moved out from under the cursor. Regardless, we don't want to start a drag on
// something that's not actually under the drag origin.
return std::nullopt;
}
return { hitTestResult };
}
bool DragController::startDrag(Frame& src, const DragState& state, OptionSet<DragOperation> sourceOperationMask, const PlatformMouseEvent& dragEvent, const IntPoint& dragOrigin, HasNonDefaultPasteboardData hasData)
{
if (!state.source)
return false;
#if PLATFORM(GTK)
if (dragEvent.isTouchEvent())
return false;
#endif
Ref<Frame> protector(src);
auto hitTestResult = hitTestResultForDragStart(src, *state.source, dragOrigin);
if (!hitTestResult)
return false;
auto linkURL = hitTestResult->absoluteLinkURL();
auto imageURL = hitTestResult->absoluteImageURL();
IntPoint mouseDraggedPoint = src.view()->windowToContents(dragEvent.position());
m_draggingImageURL = URL();
m_sourceDragOperationMask = sourceOperationMask;
DragImage dragImage;
IntPoint dragLoc(0, 0);
IntPoint dragImageOffset(0, 0);
ASSERT(state.dataTransfer);
DataTransfer& dataTransfer = *state.dataTransfer;
if (state.type == DragSourceAction::DHTML) {
dragImage = DragImage { dataTransfer.createDragImage(dragImageOffset) };
// We allow DHTML/JS to set the drag image, even if its a link, image or text we're dragging.
// This is in the spirit of the IE API, which allows overriding of pasteboard data and DragOp.
if (dragImage) {
dragLoc = dragLocForDHTMLDrag(mouseDraggedPoint, dragOrigin, dragImageOffset, !linkURL.isEmpty());
m_dragOffset = dragImageOffset;
}
}
if (state.type == DragSourceAction::Selection || !imageURL.isEmpty() || !linkURL.isEmpty()) {
// Selection, image, and link drags receive a default set of allowed drag operations that
// follows from:
// http://trac.webkit.org/browser/trunk/WebKit/mac/WebView/WebHTMLView.mm?rev=48526#L3430
m_sourceDragOperationMask.add({ DragOperation::Generic, DragOperation::Copy });
}
ASSERT(state.source);
Element& element = *state.source;
bool mustUseLegacyDragClient = hasData == HasNonDefaultPasteboardData::Yes || client().useLegacyDragClient();
IntRect dragImageBounds;
Image* image = getImage(element);
if (state.type == DragSourceAction::Selection) {
PasteboardWriterData pasteboardWriterData;
if (hasData == HasNonDefaultPasteboardData::No) {
if (src.selection().selection().isNone()) {
// The page may have cleared out the selection in the dragstart handler, in which case we should bail
// out of the drag, since there is no content to write to the pasteboard.
return false;
}
// FIXME: This entire block is almost identical to the code in Editor::copy, and the code should be shared.
auto selectionRange = src.selection().selection().toNormalizedRange();
ASSERT(selectionRange);
src.editor().willWriteSelectionToPasteboard(*selectionRange);
auto selection = src.selection().selection();
bool shouldDragAsPlainText = enclosingTextFormControl(selection.start());
if (auto range = selection.range(); range && ImageOverlay::isInsideOverlay(*range))
shouldDragAsPlainText = true;
if (shouldDragAsPlainText) {
if (mustUseLegacyDragClient)
dataTransfer.pasteboard().writePlainText(src.editor().selectedTextForDataTransfer(), Pasteboard::CannotSmartReplace);
else {
PasteboardWriterData::PlainText plainText;
plainText.canSmartCopyOrDelete = false;
plainText.text = src.editor().selectedTextForDataTransfer();
pasteboardWriterData.setPlainText(WTFMove(plainText));
}
} else {
if (mustUseLegacyDragClient) {
#if !PLATFORM(WIN)
src.editor().writeSelectionToPasteboard(dataTransfer.pasteboard());
#else
// FIXME: Convert Windows to match the other platforms and delete this.
dataTransfer.pasteboard().writeSelection(*selectionRange, src.editor().canSmartCopyOrDelete(), src, IncludeImageAltTextForDataTransfer);
#endif
} else {
#if PLATFORM(COCOA)
src.editor().writeSelection(pasteboardWriterData);
#endif
}
}
src.editor().didWriteSelectionToPasteboard();
}
client().willPerformDragSourceAction(DragSourceAction::Selection, dragOrigin, dataTransfer);
if (!dragImage) {
TextIndicatorData textIndicator;
dragImage = DragImage { dissolveDragImageToFraction(createDragImageForSelection(src, textIndicator), DragImageAlpha) };
if (textIndicator.contentImage)
dragImage.setIndicatorData(textIndicator);
dragLoc = dragLocForSelectionDrag(src);
m_dragOffset = IntPoint(dragOrigin.x() - dragLoc.x(), dragOrigin.y() - dragLoc.y());
}
if (!dragImage)
return false;
if (mustUseLegacyDragClient) {
doSystemDrag(WTFMove(dragImage), dragLoc, dragOrigin, src, state, { });
return true;
}
DragItem dragItem;
dragItem.imageAnchorPoint = dragImageAnchorPointForSelectionDrag(src, mouseDraggedPoint);
dragItem.image = WTFMove(dragImage);
dragItem.data = WTFMove(pasteboardWriterData);
dragItem.containsSelection = true;
beginDrag(WTFMove(dragItem), src, dragOrigin, mouseDraggedPoint, dataTransfer, DragSourceAction::Selection);
return true;
}
if (!src.document()->securityOrigin().canDisplay(linkURL)) {
src.document()->addConsoleMessage(MessageSource::Security, MessageLevel::Error, "Not allowed to drag local resource: " + linkURL.stringCenterEllipsizedToLength());
return false;
}
if (!imageURL.isEmpty() && image && !image->isNull() && m_dragSourceAction.contains(DragSourceAction::Image)) {
// We shouldn't be starting a drag for an image that can't provide an extension.
// This is an early detection for problems encountered later upon drop.
ASSERT(!image->filenameExtension().isEmpty());
#if ENABLE(ATTACHMENT_ELEMENT)
auto attachmentInfo = src.editor().promisedAttachmentInfo(element);
#else
PromisedAttachmentInfo attachmentInfo;
#endif
if (hasData == HasNonDefaultPasteboardData::No) {
m_draggingImageURL = imageURL;
if (element.isContentRichlyEditable())
selectElement(element);
if (!attachmentInfo)
declareAndWriteDragImage(dataTransfer, element, !linkURL.isEmpty() ? linkURL : imageURL, hitTestResult->altDisplayString());
}
client().willPerformDragSourceAction(DragSourceAction::Image, dragOrigin, dataTransfer);
if (!dragImage)
doImageDrag(element, dragOrigin, hitTestResult->imageRect(), src, m_dragOffset, state, WTFMove(attachmentInfo));
else {
// DHTML defined drag image
doSystemDrag(WTFMove(dragImage), dragLoc, dragOrigin, src, state, WTFMove(attachmentInfo));
}
return true;
}
if (!linkURL.isEmpty() && m_dragSourceAction.contains(DragSourceAction::Link)) {
PasteboardWriterData pasteboardWriterData;
String textContentWithSimplifiedWhiteSpace = hitTestResult->textContent().simplifyWhiteSpace();
if (hasData == HasNonDefaultPasteboardData::No) {
// Simplify whitespace so the title put on the dataTransfer resembles what the user sees
// on the web page. This includes replacing newlines with spaces.
if (mustUseLegacyDragClient)
src.editor().copyURL(linkURL, textContentWithSimplifiedWhiteSpace, dataTransfer.pasteboard());
else
pasteboardWriterData.setURLData(src.editor().pasteboardWriterURL(linkURL, textContentWithSimplifiedWhiteSpace));
} else if (dataTransfer.pasteboard().canWriteTrustworthyWebURLsPboardType()) {
// Make sure the pasteboard also contains trustworthy link data
// but don't overwrite more general pasteboard types.
PasteboardURL pasteboardURL;
pasteboardURL.url = linkURL;
pasteboardURL.title = hitTestResult->textContent();
dataTransfer.pasteboard().writeTrustworthyWebURLsPboardType(pasteboardURL);
}
const VisibleSelection& sourceSelection = src.selection().selection();
if (sourceSelection.isCaret() && sourceSelection.isContentEditable()) {
// a user can initiate a drag on a link without having any text
// selected. In this case, we should expand the selection to
// the enclosing anchor element
Position pos = sourceSelection.base();
Node* node = enclosingAnchorElement(pos);
if (node)
src.selection().setSelection(VisibleSelection::selectionFromContentsOfNode(node));
}
client().willPerformDragSourceAction(DragSourceAction::Link, dragOrigin, dataTransfer);
if (!dragImage) {
TextIndicatorData textIndicator;
dragImage = DragImage { createDragImageForLink(element, linkURL, textContentWithSimplifiedWhiteSpace, textIndicator, src.settings().fontRenderingMode(), m_page.deviceScaleFactor()) };
if (dragImage) {
m_dragOffset = dragOffsetForLinkDragImage(dragImage.get());
dragLoc = IntPoint(dragOrigin.x() + m_dragOffset.x(), dragOrigin.y() + m_dragOffset.y());
dragImage = DragImage { platformAdjustDragImageForDeviceScaleFactor(dragImage.get(), m_page.deviceScaleFactor()) };
if (textIndicator.contentImage)
dragImage.setIndicatorData(textIndicator);
}
}
if (mustUseLegacyDragClient) {
doSystemDrag(WTFMove(dragImage), dragLoc, dragOrigin, src, state, { });
return true;
}
DragItem dragItem;
dragItem.imageAnchorPoint = dragImage ? anchorPointForLinkDragImage(dragImage.get()) : FloatPoint();
dragItem.image = WTFMove(dragImage);
dragItem.data = WTFMove(pasteboardWriterData);
dragItem.containsSelection = true;
beginDrag(WTFMove(dragItem), src, dragOrigin, mouseDraggedPoint, dataTransfer, DragSourceAction::Selection);
return true;
}
#if ENABLE(ATTACHMENT_ELEMENT)
if (is<HTMLAttachmentElement>(element) && m_dragSourceAction.contains(DragSourceAction::Attachment)) {
auto& attachment = downcast<HTMLAttachmentElement>(element);
auto* attachmentRenderer = attachment.renderer();
src.editor().setIgnoreSelectionChanges(true);
auto previousSelection = src.selection().selection();
selectElement(element);
PromisedAttachmentInfo promisedAttachment;
if (hasData == HasNonDefaultPasteboardData::No) {
auto& editor = src.editor();
promisedAttachment = editor.promisedAttachmentInfo(attachment);
#if PLATFORM(COCOA)
if (!promisedAttachment && editor.client()) {
// Otherwise, if no file URL is specified, call out to the injected bundle to populate the pasteboard with data.
editor.willWriteSelectionToPasteboard(src.selection().selection().toNormalizedRange());
editor.writeSelectionToPasteboard(dataTransfer.pasteboard());
editor.didWriteSelectionToPasteboard();
}
#endif
}
client().willPerformDragSourceAction(DragSourceAction::Attachment, dragOrigin, dataTransfer);
if (!dragImage) {
TextIndicatorData textIndicator;
if (attachmentRenderer)
attachmentRenderer->setShouldDrawBorder(false);
dragImage = DragImage { dissolveDragImageToFraction(createDragImageForSelection(src, textIndicator), DragImageAlpha) };
if (attachmentRenderer)
attachmentRenderer->setShouldDrawBorder(true);
if (textIndicator.contentImage)
dragImage.setIndicatorData(textIndicator);
dragLoc = dragLocForSelectionDrag(src);
m_dragOffset = IntPoint(dragOrigin.x() - dragLoc.x(), dragOrigin.y() - dragLoc.y());
}
doSystemDrag(WTFMove(dragImage), dragLoc, dragOrigin, src, state, WTFMove(promisedAttachment));
if (!element.isContentRichlyEditable())
src.selection().setSelection(previousSelection);
src.editor().setIgnoreSelectionChanges(false);
return true;
}
#endif
#if ENABLE(INPUT_TYPE_COLOR)
bool isColorControl = is<HTMLInputElement>(state.source) && downcast<HTMLInputElement>(*state.source).isColorControl();
if (isColorControl && m_dragSourceAction.contains(DragSourceAction::Color)) {
auto& input = downcast<HTMLInputElement>(*state.source);
auto color = input.valueAsColor();
Path visiblePath;
dragImage = DragImage { createDragImageForColor(color, input.boundsInRootViewSpace(), input.document().page()->pageScaleFactor(), visiblePath) };
dragImage.setVisiblePath(visiblePath);
dataTransfer.pasteboard().write(color);
dragImageOffset = IntPoint { dragImageSize(dragImage.get()) };
dragLoc = dragLocForDHTMLDrag(mouseDraggedPoint, dragOrigin, dragImageOffset, false);
client().willPerformDragSourceAction(DragSourceAction::Color, dragOrigin, dataTransfer);
doSystemDrag(WTFMove(dragImage), dragLoc, dragOrigin, src, state, { });
return true;
}
#endif
#if ENABLE(MODEL_ELEMENT)
bool isModel = is<HTMLModelElement>(state.source);
if (isModel && m_dragSourceAction.contains(DragSourceAction::Model)) {
auto& modelElement = downcast<HTMLModelElement>(*state.source);
dragImage = DragImage { createDragImageForNode(src, modelElement) };
PasteboardImage pasteboardImage;
pasteboardImage.suggestedName = modelElement.currentSrc().lastPathComponent().toString();
pasteboardImage.resourceMIMEType = modelElement.model()->mimeType();
pasteboardImage.resourceData = modelElement.model()->data();
dataTransfer.pasteboard().write(pasteboardImage);
dragImageOffset = IntPoint { dragImageSize(dragImage.get()) };
dragLoc = dragLocForDHTMLDrag(mouseDraggedPoint, dragOrigin, dragImageOffset, false);
client().willPerformDragSourceAction(DragSourceAction::Model, dragOrigin, dataTransfer);
doSystemDrag(WTFMove(dragImage), dragLoc, dragOrigin, src, state, { });
return true;
}
#endif
if (state.type == DragSourceAction::DHTML && dragImage) {
ASSERT(m_dragSourceAction.contains(DragSourceAction::DHTML));
client().willPerformDragSourceAction(DragSourceAction::DHTML, dragOrigin, dataTransfer);
doSystemDrag(WTFMove(dragImage), dragLoc, dragOrigin, src, state, { });
return true;
}
return false;
}
void DragController::doImageDrag(Element& element, const IntPoint& dragOrigin, const IntRect& layoutRect, Frame& frame, IntPoint& dragImageOffset, const DragState& state, PromisedAttachmentInfo&& attachmentInfo)
{
IntPoint mouseDownPoint = dragOrigin;
DragImage dragImage;
IntPoint scaledOrigin;
if (!element.renderer())
return;
ImageOrientation orientation = element.renderer()->imageOrientation();
Image* image = getImage(element);
if (image && !layoutRect.isEmpty() && shouldUseCachedImageForDragImage(*image) && (dragImage = DragImage { createDragImageFromImage(image, orientation) })) {
dragImage = DragImage { fitDragImageToMaxSize(dragImage.get(), layoutRect.size(), maxDragImageSize()) };
IntSize fittedSize = dragImageSize(dragImage.get());
dragImage = DragImage { platformAdjustDragImageForDeviceScaleFactor(dragImage.get(), m_page.deviceScaleFactor()) };
dragImage = DragImage { dissolveDragImageToFraction(dragImage.get(), DragImageAlpha) };
// Properly orient the drag image and orient it differently if it's smaller than the original.
float scale = fittedSize.width() / (float)layoutRect.width();
float dx = scale * (layoutRect.x() - mouseDownPoint.x());
float originY = layoutRect.y();
#if PLATFORM(COCOA)
// Compensate for accursed flipped coordinates in Cocoa.
originY += layoutRect.height();
#endif
float dy = scale * (originY - mouseDownPoint.y());
scaledOrigin = IntPoint((int)(dx + 0.5), (int)(dy + 0.5));
} else {
if (CachedImage* cachedImage = getCachedImage(element)) {
dragImage = DragImage { createDragImageIconForCachedImageFilename(cachedImage->response().suggestedFilename()) };
if (dragImage) {
dragImage = DragImage { platformAdjustDragImageForDeviceScaleFactor(dragImage.get(), m_page.deviceScaleFactor()) };
scaledOrigin = IntPoint(DragIconRightInset - dragImageSize(dragImage.get()).width(), DragIconBottomInset);
}
}
}
if (!dragImage)
return;
dragImageOffset = mouseDownPoint + scaledOrigin;
doSystemDrag(WTFMove(dragImage), dragImageOffset, dragOrigin, frame, state, WTFMove(attachmentInfo));
}
void DragController::beginDrag(DragItem dragItem, Frame& frame, const IntPoint& mouseDownPoint, const IntPoint& mouseDraggedPoint, DataTransfer& dataTransfer, DragSourceAction dragSourceAction)
{
ASSERT(!client().useLegacyDragClient());
m_didInitiateDrag = true;
m_dragInitiator = frame.document();
// Protect this frame and view, as a load may occur mid drag and attempt to unload this frame
Ref<Frame> mainFrameProtector(m_page.mainFrame());
RefPtr<FrameView> viewProtector = mainFrameProtector->view();
auto mouseDownPointInRootViewCoordinates = viewProtector->rootViewToContents(frame.view()->contentsToRootView(mouseDownPoint));
auto mouseDraggedPointInRootViewCoordinates = viewProtector->rootViewToContents(frame.view()->contentsToRootView(mouseDraggedPoint));
client().beginDrag(WTFMove(dragItem), frame, mouseDownPointInRootViewCoordinates, mouseDraggedPointInRootViewCoordinates, dataTransfer, dragSourceAction);
}
static RefPtr<Element> containingLinkElement(Element& element)
{
for (auto& currentElement : lineageOfType<Element>(element)) {
if (currentElement.isLink())
return &currentElement;
}
return nullptr;
}
void DragController::doSystemDrag(DragImage image, const IntPoint& dragLoc, const IntPoint& eventPos, Frame& frame, const DragState& state, PromisedAttachmentInfo&& promisedAttachmentInfo)
{
m_didInitiateDrag = true;
m_dragInitiator = frame.document();
// Protect this frame and view, as a load may occur mid drag and attempt to unload this frame
Ref<Frame> frameProtector(m_page.mainFrame());
RefPtr<FrameView> viewProtector = frameProtector->view();
DragItem item;
item.image = WTFMove(image);
ASSERT(state.type.hasExactlyOneBitSet());
item.sourceAction = state.type.toSingleValue();
item.promisedAttachmentInfo = WTFMove(promisedAttachmentInfo);
item.containsSelection = frame.selection().contains(eventPos);
auto eventPositionInRootViewCoordinates = frame.view()->contentsToRootView(eventPos);
auto dragLocationInRootViewCoordinates = frame.view()->contentsToRootView(dragLoc);
item.eventPositionInContentCoordinates = viewProtector->rootViewToContents(eventPositionInRootViewCoordinates);
item.dragLocationInContentCoordinates = viewProtector->rootViewToContents(dragLocationInRootViewCoordinates);
item.dragLocationInWindowCoordinates = viewProtector->contentsToWindow(item.dragLocationInContentCoordinates);
if (auto element = state.source) {
auto dataTransferImageElement = state.dataTransfer->dragImageElement();
if (state.type == DragSourceAction::DHTML) {
// If the drag image has been customized, fall back to positioning the preview relative to the drag event location.
IntSize dragPreviewSize;
if (dataTransferImageElement)
dragPreviewSize = dataTransferImageElement->boundsInRootViewSpace().size();
else {
dragPreviewSize = dragImageSize(item.image.get());
if (auto* page = frame.page())
dragPreviewSize.scale(1 / page->deviceScaleFactor());
}
item.dragPreviewFrameInRootViewCoordinates = { dragLocationInRootViewCoordinates, WTFMove(dragPreviewSize) };
} else {
// We can position the preview using the bounds of the drag source element.
item.dragPreviewFrameInRootViewCoordinates = element->boundsInRootViewSpace();
}
if (auto link = containingLinkElement(*element)) {
auto titleAttribute = link->attributeWithoutSynchronization(HTMLNames::titleAttr);
item.title = titleAttribute.isEmpty() ? link->innerText() : titleAttribute.string();
item.url = frame.document()->completeURL(stripLeadingAndTrailingHTMLSpaces(link->getAttribute(HTMLNames::hrefAttr)));
}
}
client().startDrag(WTFMove(item), *state.dataTransfer, frameProtector.get());
// DragClient::startDrag can cause our Page to dispear, deallocating |this|.
if (!frameProtector->page())
return;
cleanupAfterSystemDrag();
}
void DragController::removeAllDroppedImagePlaceholders()
{
m_droppedImagePlaceholderRange = std::nullopt;
for (auto& placeholder : std::exchange(m_droppedImagePlaceholders, { })) {
if (placeholder->isConnected())
placeholder->remove();
}
}
bool DragController::tryToUpdateDroppedImagePlaceholders(const DragData& dragData)
{
ASSERT(!m_droppedImagePlaceholders.isEmpty());
ASSERT(m_droppedImagePlaceholderRange);
Ref document = m_droppedImagePlaceholders[0]->document();
RefPtr frame = document->frame();
if (!frame)
return false;
WebContentReader reader(*frame, *m_droppedImagePlaceholderRange, true);
auto pasteboard = Pasteboard::create(dragData);
pasteboard->read(reader);
if (!reader.fragment)
return false;
Vector<Ref<HTMLImageElement>> imageElements;
for (auto& imageElement : descendantsOfType<HTMLImageElement>(*reader.fragment))
imageElements.append(imageElement);
if (imageElements.size() != m_droppedImagePlaceholders.size()) {
ASSERT_NOT_REACHED();
return false;
}
for (size_t i = 0; i < imageElements.size(); ++i) {
auto& imageElement = imageElements[i];
auto& placeholder = m_droppedImagePlaceholders[i];
placeholder->setAttributeWithoutSynchronization(HTMLNames::srcAttr, imageElement->attributeWithoutSynchronization(HTMLNames::srcAttr));
#if ENABLE(ATTACHMENT_ELEMENT)
if (auto attachment = imageElement->attachmentElement())
placeholder->setAttachmentElement(attachment.releaseNonNull());
#endif
}
return true;
}
void DragController::insertDroppedImagePlaceholdersAtCaret(const Vector<IntSize>& imageSizes)
{
auto& caretController = m_page.dragCaretController();
if (!caretController.isContentRichlyEditable())
return;
auto dropCaret = caretController.caretPosition();
if (dropCaret.isNull())
return;
RefPtr document = dropCaret.deepEquivalent().document();
if (!document)
return;
RefPtr frame = document->frame();
if (!frame)
return;
IgnoreSelectionChangeForScope selectionChange { *frame };
auto fragment = DocumentFragment::create(*document);
for (auto& size : imageSizes) {
ASSERT(!size.isEmpty());
auto image = HTMLImageElement::create(*document);
image->setAttributeWithoutSynchronization(HTMLNames::widthAttr, AtomString::number(size.width()));
image->setAttributeWithoutSynchronization(HTMLNames::heightAttr, AtomString::number(size.height()));
image->setInlineStyleProperty(CSSPropertyMaxWidth, 100, CSSUnitType::CSS_PERCENTAGE);
image->setInlineStyleProperty(CSSPropertyBackgroundColor, serializationForCSS(Color::black.colorWithAlphaByte(13)));
image->setIsDroppedImagePlaceholder();
fragment->appendChild(WTFMove(image));
}
frame->selection().setSelection(dropCaret);
auto command = ReplaceSelectionCommand::create(*document, WTFMove(fragment), { ReplaceSelectionCommand::PreventNesting, ReplaceSelectionCommand::SmartReplace }, EditAction::InsertFromDrop);
command->apply();
auto insertedContentRange = command->insertedContentRange();
if (!insertedContentRange) {
ASSERT_NOT_REACHED();
return;
}
auto container = commonInclusiveAncestor<ComposedTree>(*insertedContentRange);
if (!is<ContainerNode>(container)) {
ASSERT_NOT_REACHED();
return;
}
Vector<Ref<HTMLImageElement>> placeholders;
for (auto& placeholder : descendantsOfType<HTMLImageElement>(downcast<ContainerNode>(*container))) {
if (intersects<ComposedTree>(*insertedContentRange, placeholder))
placeholders.append(placeholder);
}
if (placeholders.size() != imageSizes.size()) {
ASSERT_NOT_REACHED();
return;
}
for (size_t i = 0; i < placeholders.size(); ++i) {
auto& placeholder = placeholders[i];
auto imageSize = imageSizes[i];
double clientWidth = placeholder->clientWidth();
double heightRespectingAspectRatio = (imageSize.height() * clientWidth) / imageSize.width();
placeholder->setAttributeWithoutSynchronization(HTMLNames::heightAttr, AtomString::number(heightRespectingAspectRatio));
}
document->updateLayout();
m_droppedImagePlaceholders = WTFMove(placeholders);
m_droppedImagePlaceholderRange = WTFMove(insertedContentRange);
frame->selection().clear();
caretController.setCaretPosition(makeDeprecatedLegacyPosition(m_droppedImagePlaceholderRange->start));
}
void DragController::finalizeDroppedImagePlaceholder(HTMLImageElement& placeholder, CompletionHandler<void()>&& completion)
{
placeholder.document().eventLoop().queueTask(TaskSource::InternalAsyncTask, [completion = WTFMove(completion), placeholder = Ref { placeholder }] () mutable {
if (placeholder->isDroppedImagePlaceholder()) {
placeholder->removeAttribute(HTMLNames::heightAttr);
placeholder->removeInlineStyleProperty(CSSPropertyBackgroundColor);
}
completion();
});
}
// Manual drag caret manipulation
void DragController::placeDragCaret(const IntPoint& windowPoint)
{
mouseMovedIntoDocument(m_page.mainFrame().documentAtPoint(windowPoint));
if (!m_documentUnderMouse)
return;
Frame* frame = m_documentUnderMouse->frame();
FrameView* frameView = frame->view();
if (!frameView)
return;
IntPoint framePoint = frameView->windowToContents(windowPoint);
m_page.dragCaretController().setCaretPosition(frame->visiblePositionForPoint(framePoint));
}
bool DragController::shouldUseCachedImageForDragImage(const Image& image) const
{
#if PLATFORM(IOS_FAMILY)
UNUSED_PARAM(image);
return true;
#else
return image.size().height() * image.size().width() <= MaxOriginalImageArea;
#endif
}
#endif // ENABLE(DRAG_SUPPORT)
} // namespace WebCore