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webkit / WebKit / 3171213d84ddc1cb3289622b38ea4b8b7d089653 / . / Source / WebCore / page / EventHandler.cpp
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/*
* Copyright (C) 2006-2017 Apple Inc. All rights reserved.
* Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
* Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
*
* 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 "EventHandler.h"
#include "AutoscrollController.h"
#include "BackForwardController.h"
#include "CachedImage.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "ComposedTreeAncestorIterator.h"
#include "ComposedTreeIterator.h"
#include "CursorList.h"
#include "DocumentMarkerController.h"
#include "DragController.h"
#include "DragState.h"
#include "Editing.h"
#include "Editor.h"
#include "EditorClient.h"
#include "EventNames.h"
#include "FileList.h"
#include "FloatPoint.h"
#include "FloatRect.h"
#include "FocusController.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameSelection.h"
#include "FrameTree.h"
#include "FrameView.h"
#include "FullscreenManager.h"
#include "HTMLDocument.h"
#include "HTMLFrameElement.h"
#include "HTMLFrameSetElement.h"
#include "HTMLHtmlElement.h"
#include "HTMLIFrameElement.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "HitTestRequest.h"
#include "HitTestResult.h"
#include "Image.h"
#include "InspectorInstrumentation.h"
#include "KeyboardEvent.h"
#include "Logging.h"
#include "MouseEvent.h"
#include "MouseEventWithHitTestResults.h"
#include "NotImplemented.h"
#include "Page.h"
#include "PageOverlayController.h"
#include "Pasteboard.h"
#include "PlatformEvent.h"
#include "PlatformKeyboardEvent.h"
#include "PlatformWheelEvent.h"
#include "PluginDocument.h"
#include "Range.h"
#include "RenderFrameSet.h"
#include "RenderLayer.h"
#include "RenderListBox.h"
#include "RenderTextControlSingleLine.h"
#include "RenderView.h"
#include "RenderWidget.h"
#include "ResourceLoadObserver.h"
#include "RuntimeApplicationChecks.h"
#include "SVGDocument.h"
#include "SVGNames.h"
#include "ScrollLatchingState.h"
#include "Scrollbar.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "SpatialNavigation.h"
#include "StaticPasteboard.h"
#include "StyleCachedImage.h"
#include "TextEvent.h"
#include "TextIterator.h"
#include "UserGestureIndicator.h"
#include "UserTypingGestureIndicator.h"
#include "ValidationMessageClient.h"
#include "VisibleUnits.h"
#include "WheelEvent.h"
#include "WheelEventDeltaFilter.h"
#include "WindowsKeyboardCodes.h"
#include <wtf/Assertions.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/StdLibExtras.h>
#if ENABLE(IOS_TOUCH_EVENTS)
#include "PlatformTouchEventIOS.h"
#endif
#if ENABLE(TOUCH_EVENTS)
#include "TouchEvent.h"
#include "TouchList.h"
#endif
#if ENABLE(TOUCH_EVENTS) && !ENABLE(IOS_TOUCH_EVENTS)
#include "PlatformTouchEvent.h"
#endif
#if ENABLE(MAC_GESTURE_EVENTS)
#include "PlatformGestureEventMac.h"
#endif
#if ENABLE(POINTER_LOCK)
#include "PointerLockController.h"
#endif
#if PLATFORM(IOS_FAMILY)
#include "DOMTimerHoldingTank.h"
#endif
namespace WebCore {
using namespace HTMLNames;
#if ENABLE(DRAG_SUPPORT)
// The link drag hysteresis is much larger than the others because there
// needs to be enough space to cancel the link press without starting a link drag,
// and because dragging links is rare.
const int LinkDragHysteresis = 40;
const int ImageDragHysteresis = 5;
const int TextDragHysteresis = 3;
const int ColorDragHystersis = 3;
const int GeneralDragHysteresis = 3;
#if PLATFORM(MAC)
const Seconds EventHandler::TextDragDelay { 150_ms };
#else
const Seconds EventHandler::TextDragDelay { 0_s };
#endif
#endif // ENABLE(DRAG_SUPPORT)
#if ENABLE(IOS_GESTURE_EVENTS) || ENABLE(MAC_GESTURE_EVENTS)
const float GestureUnknown = 0;
#endif
#if ENABLE(IOS_TOUCH_EVENTS)
// FIXME: Share this constant with EventHandler and SliderThumbElement.
const unsigned InvalidTouchIdentifier = 0;
#endif
// Match key code of composition keydown event on windows.
// IE sends VK_PROCESSKEY which has value 229;
const int CompositionEventKeyCode = 229;
using namespace SVGNames;
#if !ENABLE(IOS_TOUCH_EVENTS)
// The amount of time to wait before sending a fake mouse event, triggered
// during a scroll. The short interval is used if the content responds to the mouse events
// in fakeMouseMoveDurationThreshold or less, otherwise the long interval is used.
const double fakeMouseMoveDurationThreshold = 0.01;
const Seconds fakeMouseMoveShortInterval = { 100_ms };
const Seconds fakeMouseMoveLongInterval = { 250_ms };
#endif
#if ENABLE(CURSOR_SUPPORT)
// The amount of time to wait for a cursor update on style and layout changes
// Set to 50Hz, no need to be faster than common screen refresh rate
static const Seconds cursorUpdateInterval { 20_ms };
const int maximumCursorSize = 128;
#endif
#if ENABLE(MOUSE_CURSOR_SCALE)
// It's pretty unlikely that a scale of less than one would ever be used. But all we really
// need to ensure here is that the scale isn't so small that integer overflow can occur when
// dividing cursor sizes (limited above) by the scale.
const double minimumCursorScale = 0.001;
#endif
class MaximumDurationTracker {
public:
explicit MaximumDurationTracker(double *maxDuration)
: m_maxDuration(maxDuration)
, m_start(MonotonicTime::now())
{
}
~MaximumDurationTracker()
{
*m_maxDuration = std::max(*m_maxDuration, (MonotonicTime::now() - m_start).seconds());
}
private:
double* m_maxDuration;
MonotonicTime m_start;
};
#if ENABLE(TOUCH_EVENTS) && !ENABLE(IOS_TOUCH_EVENTS)
class SyntheticTouchPoint : public PlatformTouchPoint {
public:
// The default values are based on http://dvcs.w3.org/hg/webevents/raw-file/tip/touchevents.html
explicit SyntheticTouchPoint(const PlatformMouseEvent& event)
{
const static int idDefaultValue = 0;
const static int radiusYDefaultValue = 1;
const static int radiusXDefaultValue = 1;
const static float rotationAngleDefaultValue = 0.0f;
const static float forceDefaultValue = 1.0f;
m_id = idDefaultValue; // There is only one active TouchPoint.
m_screenPos = event.globalPosition();
m_pos = event.position();
m_radiusY = radiusYDefaultValue;
m_radiusX = radiusXDefaultValue;
m_rotationAngle = rotationAngleDefaultValue;
m_force = forceDefaultValue;
PlatformEvent::Type type = event.type();
ASSERT(type == PlatformEvent::MouseMoved || type == PlatformEvent::MousePressed || type == PlatformEvent::MouseReleased);
switch (type) {
case PlatformEvent::MouseMoved:
m_state = TouchMoved;
break;
case PlatformEvent::MousePressed:
m_state = TouchPressed;
break;
case PlatformEvent::MouseReleased:
m_state = TouchReleased;
break;
default:
ASSERT_NOT_REACHED();
break;
}
}
};
class SyntheticSingleTouchEvent : public PlatformTouchEvent {
public:
explicit SyntheticSingleTouchEvent(const PlatformMouseEvent& event)
{
switch (event.type()) {
case PlatformEvent::MouseMoved:
m_type = TouchMove;
break;
case PlatformEvent::MousePressed:
m_type = TouchStart;
break;
case PlatformEvent::MouseReleased:
m_type = TouchEnd;
break;
default:
ASSERT_NOT_REACHED();
m_type = NoType;
break;
}
m_timestamp = event.timestamp();
m_modifiers = event.modifiers();
m_touchPoints.append(SyntheticTouchPoint(event));
}
};
#endif // ENABLE(TOUCH_EVENTS) && !ENABLE(IOS_TOUCH_EVENTS)
static inline ScrollGranularity wheelGranularityToScrollGranularity(unsigned deltaMode)
{
switch (deltaMode) {
case WheelEvent::DOM_DELTA_PAGE:
return ScrollByPage;
case WheelEvent::DOM_DELTA_LINE:
return ScrollByLine;
case WheelEvent::DOM_DELTA_PIXEL:
return ScrollByPixel;
default:
return ScrollByPixel;
}
}
static inline bool didScrollInScrollableArea(ScrollableArea* scrollableArea, WheelEvent& wheelEvent)
{
ScrollGranularity scrollGranularity = wheelGranularityToScrollGranularity(wheelEvent.deltaMode());
bool didHandleWheelEvent = false;
if (float absoluteDelta = std::abs(wheelEvent.deltaX()))
didHandleWheelEvent |= scrollableArea->scroll(wheelEvent.deltaX() > 0 ? ScrollRight : ScrollLeft, scrollGranularity, absoluteDelta);
if (float absoluteDelta = std::abs(wheelEvent.deltaY()))
didHandleWheelEvent |= scrollableArea->scroll(wheelEvent.deltaY() > 0 ? ScrollDown : ScrollUp, scrollGranularity, absoluteDelta);
return didHandleWheelEvent;
}
static inline bool handleWheelEventInAppropriateEnclosingBox(Node* startNode, WheelEvent& wheelEvent, Element** stopElement, const FloatSize& filteredPlatformDelta, const FloatSize& filteredVelocity)
{
bool shouldHandleEvent = wheelEvent.deltaX() || wheelEvent.deltaY();
#if PLATFORM(MAC)
shouldHandleEvent |= wheelEvent.phase() == PlatformWheelEventPhaseEnded;
#if ENABLE(CSS_SCROLL_SNAP)
shouldHandleEvent |= wheelEvent.momentumPhase() == PlatformWheelEventPhaseEnded;
#endif
#endif
if (!startNode->renderer() || !shouldHandleEvent)
return false;
RenderBox& initialEnclosingBox = startNode->renderer()->enclosingBox();
if (initialEnclosingBox.isListBox())
return didScrollInScrollableArea(static_cast<RenderListBox*>(&initialEnclosingBox), wheelEvent);
RenderBox* currentEnclosingBox = &initialEnclosingBox;
while (currentEnclosingBox) {
if (RenderLayer* boxLayer = currentEnclosingBox->layer()) {
auto platformEvent = wheelEvent.underlyingPlatformEvent();
bool scrollingWasHandled;
if (platformEvent) {
auto copiedEvent = platformEvent->copyWithDeltasAndVelocity(filteredPlatformDelta.width(), filteredPlatformDelta.height(), filteredVelocity);
scrollingWasHandled = boxLayer->handleWheelEvent(copiedEvent);
} else
scrollingWasHandled = didScrollInScrollableArea(boxLayer, wheelEvent);
if (scrollingWasHandled) {
if (stopElement)
*stopElement = currentEnclosingBox->element();
return true;
}
}
if (stopElement && *stopElement && *stopElement == currentEnclosingBox->element())
return true;
currentEnclosingBox = currentEnclosingBox->containingBlock();
if (!currentEnclosingBox || currentEnclosingBox->isRenderView())
return false;
}
return false;
}
#if (ENABLE(TOUCH_EVENTS) && !PLATFORM(IOS_FAMILY))
static inline bool shouldGesturesTriggerActive()
{
// If the platform we're on supports GestureTapDown and GestureTapCancel then we'll
// rely on them to set the active state. Unfortunately there's no generic way to
// know in advance what event types are supported.
return false;
}
#endif
#if !PLATFORM(COCOA)
inline bool EventHandler::eventLoopHandleMouseUp(const MouseEventWithHitTestResults&)
{
return false;
}
#if ENABLE(DRAG_SUPPORT)
inline bool EventHandler::eventLoopHandleMouseDragged(const MouseEventWithHitTestResults&)
{
return false;
}
#endif
#endif
EventHandler::EventHandler(Frame& frame)
: m_frame(frame)
, m_hoverTimer(*this, &EventHandler::hoverTimerFired)
#if ENABLE(CURSOR_SUPPORT)
, m_cursorUpdateTimer(*this, &EventHandler::cursorUpdateTimerFired)
#endif
#if PLATFORM(MAC)
, m_pendingMomentumWheelEventsTimer(*this, &EventHandler::clearLatchedState)
#endif
, m_autoscrollController(makeUnique<AutoscrollController>())
#if !ENABLE(IOS_TOUCH_EVENTS)
, m_fakeMouseMoveEventTimer(*this, &EventHandler::fakeMouseMoveEventTimerFired)
#endif
#if ENABLE(CURSOR_VISIBILITY)
, m_autoHideCursorTimer(*this, &EventHandler::autoHideCursorTimerFired)
#endif
{
}
EventHandler::~EventHandler()
{
#if !ENABLE(IOS_TOUCH_EVENTS)
ASSERT(!m_fakeMouseMoveEventTimer.isActive());
#endif
#if ENABLE(CURSOR_VISIBILITY)
ASSERT(!m_autoHideCursorTimer.isActive());
#endif
}
#if ENABLE(DRAG_SUPPORT)
DragState& EventHandler::dragState()
{
static NeverDestroyed<DragState> state;
return state;
}
#endif
void EventHandler::clear()
{
m_hoverTimer.stop();
#if ENABLE(CURSOR_SUPPORT)
m_cursorUpdateTimer.stop();
#endif
#if !ENABLE(IOS_TOUCH_EVENTS)
m_fakeMouseMoveEventTimer.stop();
#endif
#if ENABLE(CURSOR_VISIBILITY)
cancelAutoHideCursorTimer();
#endif
m_resizeLayer = nullptr;
m_elementUnderMouse = nullptr;
m_lastElementUnderMouse = nullptr;
m_lastMouseMoveEventSubframe = nullptr;
m_lastScrollbarUnderMouse = nullptr;
m_clickCount = 0;
m_clickNode = nullptr;
#if ENABLE(IOS_GESTURE_EVENTS)
m_gestureInitialDiameter = GestureUnknown;
m_gestureInitialRotation = GestureUnknown;
#endif
#if ENABLE(IOS_GESTURE_EVENTS) || ENABLE(MAC_GESTURE_EVENTS)
m_gestureLastDiameter = GestureUnknown;
m_gestureLastRotation = GestureUnknown;
m_gestureTargets.clear();
#endif
#if ENABLE(IOS_TOUCH_EVENTS)
m_touches.clear();
m_firstTouchID = InvalidTouchIdentifier;
m_touchEventTargetSubframe = nullptr;
#endif
m_frameSetBeingResized = nullptr;
#if ENABLE(DRAG_SUPPORT)
m_dragTarget = nullptr;
m_shouldOnlyFireDragOverEvent = false;
#endif
m_mousePositionIsUnknown = true;
m_lastKnownMousePosition = IntPoint();
m_lastKnownMouseGlobalPosition = IntPoint();
m_mousePressNode = nullptr;
m_mousePressed = false;
m_capturesDragging = false;
m_capturingMouseEventsElement = nullptr;
clearLatchedState();
#if ENABLE(TOUCH_EVENTS) && !ENABLE(IOS_TOUCH_EVENTS)
m_originatingTouchPointTargets.clear();
m_originatingTouchPointDocument = nullptr;
m_originatingTouchPointTargetKey = 0;
#endif
m_maxMouseMovedDuration = 0;
m_didStartDrag = false;
}
void EventHandler::nodeWillBeRemoved(Node& nodeToBeRemoved)
{
if (nodeToBeRemoved.contains(m_clickNode.get()))
m_clickNode = nullptr;
}
static void setSelectionIfNeeded(FrameSelection& selection, const VisibleSelection& newSelection)
{
if (selection.selection() != newSelection && selection.shouldChangeSelection(newSelection))
selection.setSelection(newSelection);
}
static inline bool dispatchSelectStart(Node* node)
{
if (!node || !node->renderer())
return true;
auto event = Event::create(eventNames().selectstartEvent, Event::CanBubble::Yes, Event::IsCancelable::Yes);
node->dispatchEvent(event);
return !event->defaultPrevented();
}
static Node* nodeToSelectOnMouseDownForNode(Node& targetNode)
{
#if ENABLE(USERSELECT_ALL)
if (Node* rootUserSelectAll = Position::rootUserSelectAllForNode(&targetNode))
return rootUserSelectAll;
#endif
if (targetNode.shouldSelectOnMouseDown())
return &targetNode;
return nullptr;
}
static VisibleSelection expandSelectionToRespectSelectOnMouseDown(Node& targetNode, const VisibleSelection& selection)
{
Node* nodeToSelect = nodeToSelectOnMouseDownForNode(targetNode);
if (!nodeToSelect)
return selection;
VisibleSelection newSelection(selection);
newSelection.setBase(positionBeforeNode(nodeToSelect).upstream(CanCrossEditingBoundary));
newSelection.setExtent(positionAfterNode(nodeToSelect).downstream(CanCrossEditingBoundary));
return newSelection;
}
bool EventHandler::updateSelectionForMouseDownDispatchingSelectStart(Node* targetNode, const VisibleSelection& selection, TextGranularity granularity)
{
if (Position::nodeIsUserSelectNone(targetNode))
return false;
if (!dispatchSelectStart(targetNode)) {
m_mouseDownMayStartSelect = false;
return false;
}
if (selection.isRange())
m_selectionInitiationState = ExtendedSelection;
else {
granularity = CharacterGranularity;
m_selectionInitiationState = PlacedCaret;
}
m_frame.selection().setSelectionByMouseIfDifferent(selection, granularity);
return true;
}
void EventHandler::selectClosestWordFromHitTestResult(const HitTestResult& result, AppendTrailingWhitespace appendTrailingWhitespace)
{
Node* targetNode = result.targetNode();
VisibleSelection newSelection;
if (targetNode && targetNode->renderer()) {
VisiblePosition pos(targetNode->renderer()->positionForPoint(result.localPoint(), nullptr));
if (pos.isNotNull()) {
newSelection = VisibleSelection(pos);
newSelection.expandUsingGranularity(WordGranularity);
}
if (appendTrailingWhitespace == ShouldAppendTrailingWhitespace && newSelection.isRange())
newSelection.appendTrailingWhitespace();
updateSelectionForMouseDownDispatchingSelectStart(targetNode, expandSelectionToRespectSelectOnMouseDown(*targetNode, newSelection), WordGranularity);
}
}
static AppendTrailingWhitespace shouldAppendTrailingWhitespace(const MouseEventWithHitTestResults& result, const Frame& frame)
{
return (result.event().clickCount() == 2 && frame.editor().isSelectTrailingWhitespaceEnabled()) ? ShouldAppendTrailingWhitespace : DontAppendTrailingWhitespace;
}
void EventHandler::selectClosestWordFromMouseEvent(const MouseEventWithHitTestResults& result)
{
if (m_mouseDownMayStartSelect)
selectClosestWordFromHitTestResult(result.hitTestResult(), shouldAppendTrailingWhitespace(result, m_frame));
}
#if !PLATFORM(MAC)
VisibleSelection EventHandler::selectClosestWordFromHitTestResultBasedOnLookup(const HitTestResult&)
{
return VisibleSelection();
}
#endif
void EventHandler::selectClosestContextualWordFromMouseEvent(const MouseEventWithHitTestResults& mouseEvent)
{
Node* targetNode = mouseEvent.targetNode();
const HitTestResult& result = mouseEvent.hitTestResult();
VisibleSelection newSelection;
bool appendTrailingWhitespace = shouldAppendTrailingWhitespace(mouseEvent, m_frame);
if (targetNode && targetNode->renderer()) {
newSelection = selectClosestWordFromHitTestResultBasedOnLookup(result);
if (newSelection.isNone()) {
VisiblePosition pos(targetNode->renderer()->positionForPoint(result.localPoint(), nullptr));
if (pos.isNotNull()) {
newSelection = VisibleSelection(pos);
newSelection.expandUsingGranularity(WordGranularity);
}
}
if (appendTrailingWhitespace == ShouldAppendTrailingWhitespace && newSelection.isRange())
newSelection.appendTrailingWhitespace();
updateSelectionForMouseDownDispatchingSelectStart(targetNode, expandSelectionToRespectSelectOnMouseDown(*targetNode, newSelection), WordGranularity);
}
}
void EventHandler::selectClosestContextualWordOrLinkFromMouseEvent(const MouseEventWithHitTestResults& result)
{
Element* urlElement = result.hitTestResult().URLElement();
if (!urlElement || !isDraggableLink(*urlElement)) {
if (Node* targetNode = result.targetNode()) {
if (isEditableNode(*targetNode))
return selectClosestWordFromMouseEvent(result);
}
return selectClosestContextualWordFromMouseEvent(result);
}
Node* targetNode = result.targetNode();
if (targetNode && targetNode->renderer() && m_mouseDownMayStartSelect) {
VisibleSelection newSelection;
VisiblePosition pos(targetNode->renderer()->positionForPoint(result.localPoint(), nullptr));
if (pos.isNotNull() && pos.deepEquivalent().deprecatedNode()->isDescendantOf(*urlElement))
newSelection = VisibleSelection::selectionFromContentsOfNode(urlElement);
updateSelectionForMouseDownDispatchingSelectStart(targetNode, expandSelectionToRespectSelectOnMouseDown(*targetNode, newSelection), WordGranularity);
}
}
bool EventHandler::handleMousePressEventDoubleClick(const MouseEventWithHitTestResults& event)
{
if (event.event().button() != LeftButton)
return false;
if (m_frame.selection().isRange())
// A double-click when range is already selected
// should not change the selection. So, do not call
// selectClosestWordFromMouseEvent, but do set
// m_beganSelectingText to prevent handleMouseReleaseEvent
// from setting caret selection.
m_selectionInitiationState = ExtendedSelection;
else
selectClosestWordFromMouseEvent(event);
return true;
}
bool EventHandler::handleMousePressEventTripleClick(const MouseEventWithHitTestResults& event)
{
if (event.event().button() != LeftButton)
return false;
Node* targetNode = event.targetNode();
if (!(targetNode && targetNode->renderer() && m_mouseDownMayStartSelect))
return false;
VisibleSelection newSelection;
VisiblePosition pos(targetNode->renderer()->positionForPoint(event.localPoint(), nullptr));
if (pos.isNotNull()) {
newSelection = VisibleSelection(pos);
newSelection.expandUsingGranularity(ParagraphGranularity);
}
return updateSelectionForMouseDownDispatchingSelectStart(targetNode, expandSelectionToRespectSelectOnMouseDown(*targetNode, newSelection), ParagraphGranularity);
}
static int textDistance(const Position& start, const Position& end)
{
auto range = Range::create(start.anchorNode()->document(), start, end);
return TextIterator::rangeLength(range.ptr(), true);
}
bool EventHandler::handleMousePressEventSingleClick(const MouseEventWithHitTestResults& event)
{
Ref<Frame> protectedFrame(m_frame);
m_frame.document()->updateLayoutIgnorePendingStylesheets();
Node* targetNode = event.targetNode();
if (!(targetNode && targetNode->renderer() && m_mouseDownMayStartSelect))
return false;
// Extend the selection if the Shift key is down, unless the click is in a link.
bool extendSelection = event.event().shiftKey() && !event.isOverLink();
// Don't restart the selection when the mouse is pressed on an
// existing selection so we can allow for text dragging.
if (FrameView* view = m_frame.view()) {
LayoutPoint vPoint = view->windowToContents(event.event().position());
if (!extendSelection && m_frame.selection().contains(vPoint)) {
m_mouseDownWasSingleClickInSelection = true;
return false;
}
}
VisiblePosition visiblePos(targetNode->renderer()->positionForPoint(event.localPoint(), nullptr));
if (visiblePos.isNull())
visiblePos = VisiblePosition(firstPositionInOrBeforeNode(targetNode), DOWNSTREAM);
Position pos = visiblePos.deepEquivalent();
VisibleSelection newSelection = m_frame.selection().selection();
TextGranularity granularity = CharacterGranularity;
if (!m_frame.editor().client()->shouldAllowSingleClickToChangeSelection(*targetNode, newSelection))
return true;
if (extendSelection && newSelection.isCaretOrRange()) {
VisibleSelection selectionInUserSelectAll = expandSelectionToRespectSelectOnMouseDown(*targetNode, VisibleSelection(pos));
if (selectionInUserSelectAll.isRange()) {
if (comparePositions(selectionInUserSelectAll.start(), newSelection.start()) < 0)
pos = selectionInUserSelectAll.start();
else if (comparePositions(newSelection.end(), selectionInUserSelectAll.end()) < 0)
pos = selectionInUserSelectAll.end();
}
if (!m_frame.editor().behavior().shouldConsiderSelectionAsDirectional() && pos.isNotNull()) {
// See <rdar://problem/3668157> REGRESSION (Mail): shift-click deselects when selection
// was created right-to-left
Position start = newSelection.start();
Position end = newSelection.end();
int distanceToStart = textDistance(start, pos);
int distanceToEnd = textDistance(pos, end);
if (distanceToStart <= distanceToEnd)
newSelection = VisibleSelection(end, pos);
else
newSelection = VisibleSelection(start, pos);
} else
newSelection.setExtent(pos);
if (m_frame.selection().granularity() != CharacterGranularity) {
granularity = m_frame.selection().granularity();
newSelection.expandUsingGranularity(m_frame.selection().granularity());
}
} else
newSelection = expandSelectionToRespectSelectOnMouseDown(*targetNode, visiblePos);
bool handled = updateSelectionForMouseDownDispatchingSelectStart(targetNode, newSelection, granularity);
if (event.event().button() == MiddleButton) {
// Ignore handled, since we want to paste to where the caret was placed anyway.
handled = handlePasteGlobalSelection(event.event()) || handled;
}
return handled;
}
static inline bool canMouseDownStartSelect(Node* node)
{
if (!node || !node->renderer())
return true;
return node->canStartSelection() || Position::nodeIsUserSelectAll(node);
}
bool EventHandler::handleMousePressEvent(const MouseEventWithHitTestResults& event)
{
Ref<Frame> protectedFrame(m_frame);
#if ENABLE(DRAG_SUPPORT)
// Reset drag state.
dragState().source = nullptr;
#endif
#if !ENABLE(IOS_TOUCH_EVENTS)
cancelFakeMouseMoveEvent();
#endif
m_frame.document()->updateLayoutIgnorePendingStylesheets();
if (ScrollView* scrollView = m_frame.view()) {
if (scrollView->isPointInScrollbarCorner(event.event().position()))
return false;
}
bool singleClick = event.event().clickCount() <= 1;
// If we got the event back, that must mean it wasn't prevented,
// so it's allowed to start a drag or selection if it wasn't in a scrollbar.
m_mouseDownMayStartSelect = canMouseDownStartSelect(event.targetNode()) && !event.scrollbar();
#if ENABLE(DRAG_SUPPORT)
// Careful that the drag starting logic stays in sync with eventMayStartDrag()
// FIXME: eventMayStartDrag() does not check for shift key press, link or image event targets.
// Bug: https://bugs.webkit.org/show_bug.cgi?id=155390
// Single mouse down on links or images can always trigger drag-n-drop.
bool isMouseDownOnLinkOrImage = event.isOverLink() || event.hitTestResult().image();
m_mouseDownMayStartDrag = singleClick && (!event.event().shiftKey() || isMouseDownOnLinkOrImage) && shouldAllowMouseDownToStartDrag();
#endif
m_mouseDownWasSingleClickInSelection = false;
m_mouseDown = event.event();
if (m_immediateActionStage != ImmediateActionStage::PerformedHitTest)
m_immediateActionStage = ImmediateActionStage::None;
if (event.isOverWidget() && passWidgetMouseDownEventToWidget(event))
return true;
if (is<SVGDocument>(*m_frame.document()) && downcast<SVGDocument>(*m_frame.document()).zoomAndPanEnabled()) {
if (event.event().shiftKey() && singleClick) {
m_svgPan = true;
downcast<SVGDocument>(*m_frame.document()).startPan(m_frame.view()->windowToContents(event.event().position()));
return true;
}
}
// We don't do this at the start of mouse down handling,
// because we don't want to do it until we know we didn't hit a widget.
if (singleClick)
focusDocumentView();
m_mousePressNode = event.targetNode();
m_frame.document()->setFocusNavigationStartingNode(event.targetNode());
#if ENABLE(DRAG_SUPPORT)
m_dragStartPosition = event.event().position();
#endif
m_mousePressed = true;
m_selectionInitiationState = HaveNotStartedSelection;
bool swallowEvent = false;
if (event.event().clickCount() == 2)
swallowEvent = handleMousePressEventDoubleClick(event);
else if (event.event().clickCount() >= 3)
swallowEvent = handleMousePressEventTripleClick(event);
else
swallowEvent = handleMousePressEventSingleClick(event);
m_mouseDownMayStartAutoscroll = m_mouseDownMayStartSelect
|| (m_mousePressNode && m_mousePressNode->renderBox() && m_mousePressNode->renderBox()->canBeProgramaticallyScrolled());
return swallowEvent;
}
VisiblePosition EventHandler::selectionExtentRespectingEditingBoundary(const VisibleSelection& selection, const LayoutPoint& localPoint, Node* targetNode)
{
FloatPoint selectionEndPoint = localPoint;
Element* editableElement = selection.rootEditableElement();
if (!targetNode || !targetNode->renderer())
return VisiblePosition();
if (editableElement && !editableElement->contains(targetNode)) {
if (!editableElement->renderer())
return VisiblePosition();
FloatPoint absolutePoint = targetNode->renderer()->localToAbsolute(FloatPoint(selectionEndPoint));
selectionEndPoint = editableElement->renderer()->absoluteToLocal(absolutePoint);
targetNode = editableElement;
}
return targetNode->renderer()->positionForPoint(LayoutPoint(selectionEndPoint), nullptr);
}
#if ENABLE(DRAG_SUPPORT)
#if !PLATFORM(IOS_FAMILY)
bool EventHandler::supportsSelectionUpdatesOnMouseDrag() const
{
return true;
}
bool EventHandler::shouldAllowMouseDownToStartDrag() const
{
return true;
}
#endif
bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& event, CheckDragHysteresis checkDragHysteresis)
{
if (!m_mousePressed)
return false;
Ref<Frame> protectedFrame(m_frame);
if (handleDrag(event, checkDragHysteresis))
return true;
Node* targetNode = event.targetNode();
if (event.event().button() != LeftButton || !targetNode)
return false;
RenderObject* renderer = targetNode->renderer();
if (!renderer) {
Element* parent = targetNode->parentOrShadowHostElement();
if (!parent)
return false;
renderer = parent->renderer();
if (!renderer || !renderer->isListBox())
return false;
}
#if PLATFORM(COCOA) // FIXME: Why does this assertion fire on other platforms?
ASSERT(m_mouseDownMayStartSelect || m_mouseDownMayStartAutoscroll);
#endif
m_mouseDownMayStartDrag = false;
if (m_mouseDownMayStartAutoscroll && !panScrollInProgress()) {
m_autoscrollController->startAutoscrollForSelection(renderer);
m_mouseDownMayStartAutoscroll = false;
}
if (m_selectionInitiationState != ExtendedSelection) {
HitTestResult result(m_mouseDownPos);
m_frame.document()->hitTest(HitTestRequest(), result);
updateSelectionForMouseDrag(result);
}
updateSelectionForMouseDrag(event.hitTestResult());
return true;
}
bool EventHandler::eventMayStartDrag(const PlatformMouseEvent& event) const
{
// This is a pre-flight check of whether the event might lead to a drag being started. Be careful
// that its logic needs to stay in sync with handleMouseMoveEvent() and the way we setMouseDownMayStartDrag
// in handleMousePressEvent
auto* document = m_frame.document();
if (!document)
return false;
if (event.button() != LeftButton || event.clickCount() != 1)
return false;
FrameView* view = m_frame.view();
if (!view)
return false;
Page* page = m_frame.page();
if (!page)
return false;
Ref<Frame> protectedFrame(m_frame);
updateDragSourceActionsAllowed();
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::DisallowUserAgentShadowContent);
HitTestResult result(view->windowToContents(event.position()));
document->hitTest(request, result);
DragState state;
Element* targetElement = result.targetElement();
return targetElement && page->dragController().draggableElement(&m_frame, targetElement, result.roundedPointInInnerNodeFrame(), state);
}
void EventHandler::updateSelectionForMouseDrag()
{
if (!supportsSelectionUpdatesOnMouseDrag())
return;
FrameView* view = m_frame.view();
if (!view)
return;
auto* document = m_frame.document();
if (!document)
return;
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::Move | HitTestRequest::DisallowUserAgentShadowContent);
HitTestResult result(view->windowToContents(m_lastKnownMousePosition));
document->hitTest(request, result);
updateSelectionForMouseDrag(result);
}
void EventHandler::updateSelectionForMouseDrag(const HitTestResult& hitTestResult)
{
if (!supportsSelectionUpdatesOnMouseDrag())
return;
if (!m_mouseDownMayStartSelect)
return;
Node* target = hitTestResult.targetNode();
if (!target)
return;
VisiblePosition targetPosition = selectionExtentRespectingEditingBoundary(m_frame.selection().selection(), hitTestResult.localPoint(), target);
// Don't modify the selection if we're not on a node.
if (targetPosition.isNull())
return;
// Restart the selection if this is the first mouse move. This work is usually
// done in handleMousePressEvent, but not if the mouse press was on an existing selection.
VisibleSelection newSelection = m_frame.selection().selection();
// Special case to limit selection to the containing block for SVG text.
// FIXME: Isn't there a better non-SVG-specific way to do this?
if (Node* selectionBaseNode = newSelection.base().deprecatedNode()) {
if (RenderObject* selectionBaseRenderer = selectionBaseNode->renderer()) {
if (selectionBaseRenderer->isSVGText()) {
if (target->renderer()->containingBlock() != selectionBaseRenderer->containingBlock())
return;
}
}
}
if (m_selectionInitiationState == HaveNotStartedSelection && !dispatchSelectStart(target)) {
m_mouseDownMayStartSelect = false;
return;
}
if (m_selectionInitiationState != ExtendedSelection) {
// Always extend selection here because it's caused by a mouse drag
m_selectionInitiationState = ExtendedSelection;
newSelection = VisibleSelection(targetPosition);
}
#if ENABLE(USERSELECT_ALL)
Node* rootUserSelectAllForMousePressNode = Position::rootUserSelectAllForNode(m_mousePressNode.get());
if (rootUserSelectAllForMousePressNode && rootUserSelectAllForMousePressNode == Position::rootUserSelectAllForNode(target)) {
newSelection.setBase(positionBeforeNode(rootUserSelectAllForMousePressNode).upstream(CanCrossEditingBoundary));
newSelection.setExtent(positionAfterNode(rootUserSelectAllForMousePressNode).downstream(CanCrossEditingBoundary));
} else {
// Reset base for user select all when base is inside user-select-all area and extent < base.
if (rootUserSelectAllForMousePressNode && comparePositions(target->renderer()->positionForPoint(hitTestResult.localPoint(), nullptr), m_mousePressNode->renderer()->positionForPoint(m_dragStartPosition, nullptr)) < 0)
newSelection.setBase(positionAfterNode(rootUserSelectAllForMousePressNode).downstream(CanCrossEditingBoundary));
Node* rootUserSelectAllForTarget = Position::rootUserSelectAllForNode(target);
if (rootUserSelectAllForTarget && m_mousePressNode->renderer() && comparePositions(target->renderer()->positionForPoint(hitTestResult.localPoint(), nullptr), m_mousePressNode->renderer()->positionForPoint(m_dragStartPosition, nullptr)) < 0)
newSelection.setExtent(positionBeforeNode(rootUserSelectAllForTarget).upstream(CanCrossEditingBoundary));
else if (rootUserSelectAllForTarget && m_mousePressNode->renderer())
newSelection.setExtent(positionAfterNode(rootUserSelectAllForTarget).downstream(CanCrossEditingBoundary));
else
newSelection.setExtent(targetPosition);
}
#else
newSelection.setExtent(targetPosition);
#endif
if (m_frame.selection().granularity() != CharacterGranularity)
newSelection.expandUsingGranularity(m_frame.selection().granularity());
m_frame.selection().setSelectionByMouseIfDifferent(newSelection, m_frame.selection().granularity(),
FrameSelection::AdjustEndpointsAtBidiBoundary);
}
#endif // ENABLE(DRAG_SUPPORT)
void EventHandler::lostMouseCapture()
{
m_frame.selection().setCaretBlinkingSuspended(false);
}
bool EventHandler::handleMouseUp(const MouseEventWithHitTestResults& event)
{
if (eventLoopHandleMouseUp(event))
return true;
// If this was the first click in the window, we don't even want to clear the selection.
// This case occurs when the user clicks on a draggable element, since we have to process
// the mouse down and drag events to see if we might start a drag. For other first clicks
// in a window, we just don't acceptFirstMouse, and the whole down-drag-up sequence gets
// ignored upstream of this layer.
return eventActivatedView(event.event());
}
bool EventHandler::handleMouseReleaseEvent(const MouseEventWithHitTestResults& event)
{
if (autoscrollInProgress())
stopAutoscrollTimer();
Ref<Frame> protectedFrame(m_frame);
if (handleMouseUp(event))
return true;
// Used to prevent mouseMoveEvent from initiating a drag before
// the mouse is pressed again.
m_mousePressed = false;
m_capturesDragging = false;
#if ENABLE(DRAG_SUPPORT)
m_mouseDownMayStartDrag = false;
#endif
m_mouseDownMayStartSelect = false;
m_mouseDownMayStartAutoscroll = false;
m_mouseDownWasInSubframe = false;
bool handled = false;
// Clear the selection if the mouse didn't move after the last mouse
// press and it's not a context menu click. We do this so when clicking
// on the selection, the selection goes away. However, if we are
// editing, place the caret.
if (m_mouseDownWasSingleClickInSelection && m_selectionInitiationState != ExtendedSelection
#if ENABLE(DRAG_SUPPORT)
&& m_dragStartPosition == event.event().position()
#endif
&& m_frame.selection().isRange()
&& event.event().button() != RightButton) {
VisibleSelection newSelection;
Node* node = event.targetNode();
bool caretBrowsing = m_frame.settings().caretBrowsingEnabled();
bool allowSelectionChanges = true;
if (node && node->renderer() && (caretBrowsing || node->hasEditableStyle())) {
VisiblePosition pos = node->renderer()->positionForPoint(event.localPoint(), nullptr);
newSelection = VisibleSelection(pos);
#if PLATFORM(IOS_FAMILY)
// On iOS, selection changes are triggered using platform-specific text interaction gestures rather than
// default behavior on click or mouseup. As such, the only time we should allow click events to change the
// selection on iOS is when we focus a different editable element, in which case the text interaction
// gestures will fail.
allowSelectionChanges = m_frame.selection().selection().rootEditableElement() != newSelection.rootEditableElement();
#endif
}
if (allowSelectionChanges)
setSelectionIfNeeded(m_frame.selection(), newSelection);
handled = true;
}
if (event.event().button() == MiddleButton) {
// Ignore handled, since we want to paste to where the caret was placed anyway.
handled = handlePasteGlobalSelection(event.event()) || handled;
}
return handled;
}
#if ENABLE(PAN_SCROLLING)
void EventHandler::didPanScrollStart()
{
m_autoscrollController->didPanScrollStart();
}
void EventHandler::didPanScrollStop()
{
m_autoscrollController->didPanScrollStop();
}
void EventHandler::startPanScrolling(RenderElement& renderer)
{
#if !PLATFORM(IOS_FAMILY)
if (!is<RenderBox>(renderer))
return;
m_autoscrollController->startPanScrolling(&downcast<RenderBox>(renderer), lastKnownMousePosition());
invalidateClick();
#endif
}
#endif // ENABLE(PAN_SCROLLING)
RenderBox* EventHandler::autoscrollRenderer() const
{
return m_autoscrollController->autoscrollRenderer();
}
void EventHandler::updateAutoscrollRenderer()
{
m_autoscrollController->updateAutoscrollRenderer();
}
bool EventHandler::autoscrollInProgress() const
{
return m_autoscrollController->autoscrollInProgress();
}
bool EventHandler::panScrollInProgress() const
{
return m_autoscrollController->panScrollInProgress();
}
#if ENABLE(DRAG_SUPPORT)
DragSourceAction EventHandler::updateDragSourceActionsAllowed() const
{
Page* page = m_frame.page();
if (!page)
return DragSourceActionNone;
FrameView* view = m_frame.view();
if (!view)
return DragSourceActionNone;
return page->dragController().delegateDragSourceAction(view->contentsToRootView(m_mouseDownPos));
}
#endif // ENABLE(DRAG_SUPPORT)
HitTestResult EventHandler::hitTestResultAtPoint(const LayoutPoint& point, HitTestRequest::HitTestRequestType hitType, const LayoutSize& padding) const
{
ASSERT((hitType & HitTestRequest::CollectMultipleElements) || padding.isEmpty());
Ref<Frame> protectedFrame(m_frame);
// We always send hitTestResultAtPoint to the main frame if we have one,
// otherwise we might hit areas that are obscured by higher frames.
if (!m_frame.isMainFrame()) {
Frame& mainFrame = m_frame.mainFrame();
FrameView* frameView = m_frame.view();
FrameView* mainView = mainFrame.view();
if (frameView && mainView) {
IntPoint mainFramePoint = mainView->rootViewToContents(frameView->contentsToRootView(roundedIntPoint(point)));
return mainFrame.eventHandler().hitTestResultAtPoint(mainFramePoint, hitType, padding);
}
}
unsigned nonNegativePaddingWidth = std::max<LayoutUnit>(0, padding.width()).toUnsigned();
unsigned nonNegativePaddingHeight = std::max<LayoutUnit>(0, padding.height()).toUnsigned();
// We should always start hit testing a clean tree.
if (auto* frameView = m_frame.view())
frameView->updateLayoutAndStyleIfNeededRecursive();
HitTestResult result(point, nonNegativePaddingHeight, nonNegativePaddingWidth, nonNegativePaddingHeight, nonNegativePaddingWidth);
auto* document = m_frame.document();
if (!document)
return result;
HitTestRequest request(hitType);
document->hitTest(request, result);
if (!request.readOnly())
m_frame.document()->updateHoverActiveState(request, result.targetElement());
if (request.disallowsUserAgentShadowContent())
result.setToNonUserAgentShadowAncestor();
return result;
}
void EventHandler::stopAutoscrollTimer(bool rendererIsBeingDestroyed)
{
m_autoscrollController->stopAutoscrollTimer(rendererIsBeingDestroyed);
}
bool EventHandler::scrollOverflow(ScrollDirection direction, ScrollGranularity granularity, Node* startingNode)
{
Node* node = startingNode;
if (!node)
node = m_frame.document()->focusedElement();
if (!node)
node = m_mousePressNode.get();
if (node) {
auto r = node->renderer();
if (r && !r->isListBox() && r->enclosingBox().scroll(direction, granularity)) {
setFrameWasScrolledByUser();
return true;
}
}
return false;
}
bool EventHandler::logicalScrollOverflow(ScrollLogicalDirection direction, ScrollGranularity granularity, Node* startingNode)
{
Node* node = startingNode;
if (!node)
node = m_frame.document()->focusedElement();
if (!node)
node = m_mousePressNode.get();
if (node) {
auto r = node->renderer();
if (r && !r->isListBox() && r->enclosingBox().logicalScroll(direction, granularity)) {
setFrameWasScrolledByUser();
return true;
}
}
return false;
}
bool EventHandler::scrollRecursively(ScrollDirection direction, ScrollGranularity granularity, Node* startingNode)
{
Ref<Frame> protectedFrame(m_frame);
// The layout needs to be up to date to determine if we can scroll. We may be
// here because of an onLoad event, in which case the final layout hasn't been performed yet.
m_frame.document()->updateLayoutIgnorePendingStylesheets();
if (scrollOverflow(direction, granularity, startingNode))
return true;
Frame* frame = &m_frame;
FrameView* view = frame->view();
if (view && view->scroll(direction, granularity))
return true;
frame = frame->tree().parent();
if (!frame)
return false;
return frame->eventHandler().scrollRecursively(direction, granularity, m_frame.ownerElement());
}
bool EventHandler::logicalScrollRecursively(ScrollLogicalDirection direction, ScrollGranularity granularity, Node* startingNode)
{
Ref<Frame> protectedFrame(m_frame);
// The layout needs to be up to date to determine if we can scroll. We may be
// here because of an onLoad event, in which case the final layout hasn't been performed yet.
m_frame.document()->updateLayoutIgnorePendingStylesheets();
if (logicalScrollOverflow(direction, granularity, startingNode))
return true;
Frame* frame = &m_frame;
FrameView* view = frame->view();
bool scrolled = false;
#if PLATFORM(COCOA)
// Mac also resets the scroll position in the inline direction.
if (granularity == ScrollByDocument && view && view->logicalScroll(ScrollInlineDirectionBackward, ScrollByDocument))
scrolled = true;
#endif
if (view && view->logicalScroll(direction, granularity))
scrolled = true;
if (scrolled)
return true;
frame = frame->tree().parent();
if (!frame)
return false;
return frame->eventHandler().logicalScrollRecursively(direction, granularity, m_frame.ownerElement());
}
IntPoint EventHandler::lastKnownMousePosition() const
{
return m_lastKnownMousePosition;
}
Frame* EventHandler::subframeForHitTestResult(const MouseEventWithHitTestResults& hitTestResult)
{
if (!hitTestResult.isOverWidget())
return 0;
return subframeForTargetNode(hitTestResult.targetNode());
}
Frame* EventHandler::subframeForTargetNode(Node* node)
{
if (!node)
return nullptr;
auto renderer = node->renderer();
if (!is<RenderWidget>(renderer))
return nullptr;
Widget* widget = downcast<RenderWidget>(*renderer).widget();
if (!is<FrameView>(widget))
return nullptr;
return &downcast<FrameView>(*widget).frame();
}
#if ENABLE(CURSOR_SUPPORT)
static bool isSubmitImage(Node* node)
{
return is<HTMLInputElement>(node) && downcast<HTMLInputElement>(*node).isImageButton();
}
// Returns true if the node's editable block is not current focused for editing
static bool nodeIsNotBeingEdited(const Node& node, const Frame& frame)
{
return frame.selection().selection().rootEditableElement() != node.rootEditableElement();
}
bool EventHandler::useHandCursor(Node* node, bool isOverLink, bool shiftKey)
{
if (!node)
return false;
bool editable = node->hasEditableStyle();
bool editableLinkEnabled = false;
// If the link is editable, then we need to check the settings to see whether or not the link should be followed
if (editable) {
switch (m_frame.settings().editableLinkBehavior()) {
default:
case EditableLinkDefaultBehavior:
case EditableLinkAlwaysLive:
editableLinkEnabled = true;
break;
case EditableLinkNeverLive:
editableLinkEnabled = false;
break;
case EditableLinkLiveWhenNotFocused:
editableLinkEnabled = nodeIsNotBeingEdited(*node, m_frame) || shiftKey;
break;
case EditableLinkOnlyLiveWithShiftKey:
editableLinkEnabled = shiftKey;
break;
}
}
return ((isOverLink || isSubmitImage(node)) && (!editable || editableLinkEnabled));
}
void EventHandler::cursorUpdateTimerFired()
{
ASSERT(m_frame.document());
updateCursor();
}
void EventHandler::updateCursor()
{
if (m_mousePositionIsUnknown)
return;
FrameView* view = m_frame.view();
if (!view)
return;
auto* document = m_frame.document();
if (!document)
return;
if (!view->shouldSetCursor())
return;
bool shiftKey;
bool ctrlKey;
bool altKey;
bool metaKey;
PlatformKeyboardEvent::getCurrentModifierState(shiftKey, ctrlKey, altKey, metaKey);
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::AllowFrameScrollbars);
HitTestResult result(view->windowToContents(m_lastKnownMousePosition));
document->hitTest(request, result);
updateCursor(*view, result, shiftKey);
}
void EventHandler::updateCursor(FrameView& view, const HitTestResult& result, bool shiftKey)
{
if (auto optionalCursor = selectCursor(result, shiftKey)) {
m_currentMouseCursor = WTFMove(optionalCursor.value());
view.setCursor(m_currentMouseCursor);
}
}
Optional<Cursor> EventHandler::selectCursor(const HitTestResult& result, bool shiftKey)
{
if (m_resizeLayer && m_resizeLayer->inResizeMode())
return WTF::nullopt;
if (!m_frame.page())
return WTF::nullopt;
#if ENABLE(PAN_SCROLLING)
if (m_frame.mainFrame().eventHandler().panScrollInProgress())
return WTF::nullopt;
#endif
Ref<Frame> protectedFrame(m_frame);
// Use always pointer cursor for scrollbars.
if (result.scrollbar()) {
#if ENABLE(CURSOR_VISIBILITY)
cancelAutoHideCursorTimer();
#endif
return pointerCursor();
}
Node* node = result.targetNode();
if (!node)
return WTF::nullopt;
auto renderer = node->renderer();
auto* style = renderer ? &renderer->style() : nullptr;
bool horizontalText = !style || style->isHorizontalWritingMode();
const Cursor& iBeam = horizontalText ? iBeamCursor() : verticalTextCursor();
#if ENABLE(CURSOR_VISIBILITY)
if (style && style->cursorVisibility() == CursorVisibility::AutoHide)
startAutoHideCursorTimer();
else
cancelAutoHideCursorTimer();
#endif
if (renderer) {
Cursor overrideCursor;
switch (renderer->getCursor(roundedIntPoint(result.localPoint()), overrideCursor)) {
case SetCursorBasedOnStyle:
break;
case SetCursor:
return overrideCursor;
case DoNotSetCursor:
return WTF::nullopt;
}
}
if (style && style->cursors()) {
const CursorList* cursors = style->cursors();
for (unsigned i = 0; i < cursors->size(); ++i) {
StyleImage* styleImage = (*cursors)[i].image();
if (!styleImage)
continue;
CachedImage* cachedImage = styleImage->cachedImage();
if (!cachedImage)
continue;
float scale = styleImage->imageScaleFactor();
// Get hotspot and convert from logical pixels to physical pixels.
IntPoint hotSpot = (*cursors)[i].hotSpot();
FloatSize size = cachedImage->imageForRenderer(renderer)->size();
if (cachedImage->errorOccurred())
continue;
// Limit the size of cursors (in UI pixels) so that they cannot be
// used to cover UI elements in chrome.
size.scale(1 / scale);
if (size.width() > maximumCursorSize || size.height() > maximumCursorSize)
continue;
Image* image = cachedImage->imageForRenderer(renderer);
#if ENABLE(MOUSE_CURSOR_SCALE)
// Ensure no overflow possible in calculations above.
if (scale < minimumCursorScale)
continue;
return Cursor(image, hotSpot, scale);
#else
ASSERT(scale == 1);
return Cursor(image, hotSpot);
#endif // ENABLE(MOUSE_CURSOR_SCALE)
}
}
// During selection, use an I-beam regardless of the content beneath the cursor.
// If a drag may be starting or we're capturing mouse events for a particular node, don't treat this as a selection.
if (m_mousePressed
&& m_mouseDownMayStartSelect
#if ENABLE(DRAG_SUPPORT)
&& !m_mouseDownMayStartDrag
#endif
&& m_frame.selection().isCaretOrRange()
&& !m_capturingMouseEventsElement)
return iBeam;
switch (style ? style->cursor() : CursorType::Auto) {
case CursorType::Auto: {
bool editable = node->hasEditableStyle();
if (useHandCursor(node, result.isOverLink(), shiftKey))
return handCursor();
bool inResizer = false;
if (renderer) {
if (RenderLayer* layer = renderer->enclosingLayer()) {
if (FrameView* view = m_frame.view())
inResizer = layer->isPointInResizeControl(view->windowToContents(roundedIntPoint(result.localPoint())));
}
}
if ((editable || (renderer && renderer->isText() && node->canStartSelection())) && !inResizer && !result.scrollbar())
return iBeam;
return pointerCursor();
}
case CursorType::Default:
return pointerCursor();
case CursorType::None:
return noneCursor();
case CursorType::ContextMenu:
return contextMenuCursor();
case CursorType::Help:
return helpCursor();
case CursorType::Pointer:
return handCursor();
case CursorType::Progress:
return progressCursor();
case CursorType::Wait:
return waitCursor();
case CursorType::Cell:
return cellCursor();
case CursorType::Crosshair:
return crossCursor();
case CursorType::Text:
return iBeamCursor();
case CursorType::VerticalText:
return verticalTextCursor();
case CursorType::Alias:
return aliasCursor();
case CursorType::Copy:
return copyCursor();
case CursorType::Move:
return moveCursor();
case CursorType::NoDrop:
return noDropCursor();
case CursorType::NotAllowed:
return notAllowedCursor();
case CursorType::Grab:
return grabCursor();
case CursorType::Grabbing:
return grabbingCursor();
case CursorType::EResize:
return eastResizeCursor();
case CursorType::NResize:
return northResizeCursor();
case CursorType::NEResize:
return northEastResizeCursor();
case CursorType::NWResize:
return northWestResizeCursor();
case CursorType::SResize:
return southResizeCursor();
case CursorType::SEResize:
return southEastResizeCursor();
case CursorType::SWResize:
return southWestResizeCursor();
case CursorType::WResize:
return westResizeCursor();
case CursorType::EWResize:
return eastWestResizeCursor();
case CursorType::NSResize:
return northSouthResizeCursor();
case CursorType::NESWResize:
return northEastSouthWestResizeCursor();
case CursorType::NWSEResize:
return northWestSouthEastResizeCursor();
case CursorType::ColumnResize:
return columnResizeCursor();
case CursorType::RowResize:
return rowResizeCursor();
case CursorType::AllScroll:
return moveCursor();
case CursorType::ZoomIn:
return zoomInCursor();
case CursorType::ZoomOut:
return zoomOutCursor();
}
return pointerCursor();
}
#endif // ENABLE(CURSOR_SUPPORT)
#if ENABLE(CURSOR_VISIBILITY)
void EventHandler::startAutoHideCursorTimer()
{
Page* page = m_frame.page();
if (!page)
return;
m_autoHideCursorTimer.startOneShot(page->settings().timeWithoutMouseMovementBeforeHidingControls());
#if !ENABLE(IOS_TOUCH_EVENTS)
// The fake mouse move event screws up the auto-hide feature (by resetting the auto-hide timer)
// so cancel any pending fake mouse moves.
if (m_fakeMouseMoveEventTimer.isActive())
m_fakeMouseMoveEventTimer.stop();
#endif
}
void EventHandler::cancelAutoHideCursorTimer()
{
if (m_autoHideCursorTimer.isActive())
m_autoHideCursorTimer.stop();
}
void EventHandler::autoHideCursorTimerFired()
{
FrameView* view = m_frame.view();
if (!view || !view->isActive())
return;
if (auto page = m_frame.page())
page->chrome().setCursorHiddenUntilMouseMoves(true);
}
#endif
static LayoutPoint documentPointForWindowPoint(Frame& frame, const IntPoint& windowPoint)
{
FrameView* view = frame.view();
// FIXME: Is it really OK to use the wrong coordinates here when view is 0?
// Historically the code would just crash; this is clearly no worse than that.
return view ? view->windowToContents(windowPoint) : windowPoint;
}
static Scrollbar* scrollbarForMouseEvent(const MouseEventWithHitTestResults& mouseEvent, FrameView* view)
{
if (view) {
if (auto* scrollbar = view->scrollbarAtPoint(mouseEvent.event().position()))
return scrollbar;
}
return mouseEvent.scrollbar();
}
bool EventHandler::handleMousePressEvent(const PlatformMouseEvent& platformMouseEvent)
{
Ref<Frame> protectedFrame(m_frame);
RefPtr<FrameView> protector(m_frame.view());
if (InspectorInstrumentation::handleMousePress(m_frame)) {
invalidateClick();
return true;
}
#if ENABLE(POINTER_LOCK)
if (m_frame.page()->pointerLockController().isLocked()) {
m_frame.page()->pointerLockController().dispatchLockedMouseEvent(platformMouseEvent, eventNames().mousedownEvent);
return true;
}
#endif
if (m_frame.page()->pageOverlayController().handleMouseEvent(platformMouseEvent))
return true;
#if ENABLE(TOUCH_EVENTS)
bool defaultPrevented = dispatchSyntheticTouchEventIfEnabled(platformMouseEvent);
if (defaultPrevented)
return true;
#endif
UserGestureIndicator gestureIndicator(ProcessingUserGesture, m_frame.document());
// FIXME (bug 68185): this call should be made at another abstraction layer
m_frame.loader().resetMultipleFormSubmissionProtection();
#if !ENABLE(IOS_TOUCH_EVENTS)
cancelFakeMouseMoveEvent();
#endif
m_mousePressed = true;
m_capturesDragging = true;
setLastKnownMousePosition(platformMouseEvent);
m_mouseDownTimestamp = platformMouseEvent.timestamp();
#if ENABLE(DRAG_SUPPORT)
m_mouseDownMayStartDrag = false;
#endif
m_mouseDownMayStartSelect = false;
m_mouseDownMayStartAutoscroll = false;
if (FrameView* view = m_frame.view())
m_mouseDownPos = view->windowToContents(platformMouseEvent.position());
else {
invalidateClick();
return false;
}
m_mouseDownWasInSubframe = false;
HitTestRequest request(HitTestRequest::Active | HitTestRequest::DisallowUserAgentShadowContent);
// Save the document point we generate in case the window coordinate is invalidated by what happens
// when we dispatch the event.
LayoutPoint documentPoint = documentPointForWindowPoint(m_frame, platformMouseEvent.position());
MouseEventWithHitTestResults mouseEvent = m_frame.document()->prepareMouseEvent(request, documentPoint, platformMouseEvent);
if (!mouseEvent.targetNode()) {
invalidateClick();
return false;
}
m_mousePressNode = mouseEvent.targetNode();
m_frame.document()->setFocusNavigationStartingNode(mouseEvent.targetNode());
Scrollbar* scrollbar = scrollbarForMouseEvent(mouseEvent, m_frame.view());
updateLastScrollbarUnderMouse(scrollbar, SetOrClearLastScrollbar::Set);
bool passedToScrollbar = scrollbar && passMousePressEventToScrollbar(mouseEvent, scrollbar);
if (!passedToScrollbar) {
RefPtr<Frame> subframe = subframeForHitTestResult(mouseEvent);
if (subframe && passMousePressEventToSubframe(mouseEvent, subframe.get())) {
// Start capturing future events for this frame. We only do this if we didn't clear
// the m_mousePressed flag, which may happen if an AppKit widget entered a modal event loop.
m_capturesDragging = subframe->eventHandler().capturesDragging();
if (m_mousePressed && m_capturesDragging) {
m_capturingMouseEventsElement = subframe->ownerElement();
m_eventHandlerWillResetCapturingMouseEventsElement = true;
}
invalidateClick();
return true;
}
}
#if ENABLE(PAN_SCROLLING)
// We store whether pan scrolling is in progress before calling stopAutoscrollTimer()
// because it will set m_autoscrollType to NoAutoscroll on return.
bool isPanScrollInProgress = m_frame.mainFrame().eventHandler().panScrollInProgress();
stopAutoscrollTimer();
if (isPanScrollInProgress) {
// We invalidate the click when exiting pan scrolling so that we don't inadvertently navigate
// away from the current page (e.g. the click was on a hyperlink). See <rdar://problem/6095023>.
invalidateClick();
return true;
}
#endif
m_clickCount = platformMouseEvent.clickCount();
m_clickNode = mouseEvent.targetNode();
if (!m_clickNode) {
invalidateClick();
return false;
}
if (FrameView* view = m_frame.view()) {
RenderLayer* layer = m_clickNode->renderer() ? m_clickNode->renderer()->enclosingLayer() : 0;
IntPoint p = view->windowToContents(platformMouseEvent.position());
if (layer && layer->isPointInResizeControl(p)) {
layer->setInResizeMode(true);
m_resizeLayer = layer;
m_offsetFromResizeCorner = layer->offsetFromResizeCorner(p);
invalidateClick();
return true;
}
}
m_frame.selection().setCaretBlinkingSuspended(true);
bool swallowEvent = !dispatchMouseEvent(eventNames().mousedownEvent, mouseEvent.targetNode(), true, m_clickCount, platformMouseEvent, true);
m_capturesDragging = !swallowEvent || mouseEvent.scrollbar();
// If the hit testing originally determined the event was in a scrollbar, refetch the MouseEventWithHitTestResults
// in case the scrollbar widget was destroyed when the mouse event was handled.
if (mouseEvent.scrollbar()) {
const bool wasLastScrollBar = mouseEvent.scrollbar() == m_lastScrollbarUnderMouse;
mouseEvent = m_frame.document()->prepareMouseEvent(HitTestRequest(), documentPoint, platformMouseEvent);
if (wasLastScrollBar && mouseEvent.scrollbar() != m_lastScrollbarUnderMouse)
m_lastScrollbarUnderMouse = nullptr;
}
if (!swallowEvent) {
// Refetch the event target node if it currently is the shadow node inside an <input> element.
// If a mouse event handler changes the input element type to one that has a widget associated,
// we'd like to EventHandler::handleMousePressEvent to pass the event to the widget and thus the
// event target node can't still be the shadow node.
if (is<ShadowRoot>(*mouseEvent.targetNode()) && is<HTMLInputElement>(*downcast<ShadowRoot>(*mouseEvent.targetNode()).host()))
mouseEvent = m_frame.document()->prepareMouseEvent(HitTestRequest(), documentPoint, platformMouseEvent);
}
if (!swallowEvent) {
if (passedToScrollbar)
swallowEvent = true;
else
swallowEvent = handleMousePressEvent(mouseEvent);
}
return swallowEvent;
}
// This method only exists for platforms that don't know how to deliver
bool EventHandler::handleMouseDoubleClickEvent(const PlatformMouseEvent& platformMouseEvent)
{
Ref<Frame> protectedFrame(m_frame);
RefPtr<FrameView> protector(m_frame.view());
m_frame.selection().setCaretBlinkingSuspended(false);
UserGestureIndicator gestureIndicator(ProcessingUserGesture, m_frame.document());
#if ENABLE(POINTER_LOCK)
if (m_frame.page()->pointerLockController().isLocked()) {
m_frame.page()->pointerLockController().dispatchLockedMouseEvent(platformMouseEvent, eventNames().mouseupEvent);
return true;
}
#endif
// We get this instead of a second mouse-up
m_mousePressed = false;
setLastKnownMousePosition(platformMouseEvent);
HitTestRequest request(HitTestRequest::Release | HitTestRequest::DisallowUserAgentShadowContent);
MouseEventWithHitTestResults mouseEvent = prepareMouseEvent(request, platformMouseEvent);
Frame* subframe = subframeForHitTestResult(mouseEvent);
if (m_eventHandlerWillResetCapturingMouseEventsElement)
m_capturingMouseEventsElement = nullptr;
if (subframe && passMousePressEventToSubframe(mouseEvent, subframe))
return true;
m_clickCount = platformMouseEvent.clickCount();
bool swallowMouseUpEvent = !dispatchMouseEvent(eventNames().mouseupEvent, mouseEvent.targetNode(), true, m_clickCount, platformMouseEvent, false);
bool swallowClickEvent = platformMouseEvent.button() != RightButton && mouseEvent.targetNode() == m_clickNode && !dispatchMouseEvent(eventNames().clickEvent, mouseEvent.targetNode(), true, m_clickCount, platformMouseEvent, true);
if (m_lastScrollbarUnderMouse)
swallowMouseUpEvent = m_lastScrollbarUnderMouse->mouseUp(platformMouseEvent);
bool swallowMouseReleaseEvent = !swallowMouseUpEvent && handleMouseReleaseEvent(mouseEvent);
invalidateClick();
return swallowMouseUpEvent || swallowClickEvent || swallowMouseReleaseEvent;
}
static ScrollableArea* enclosingScrollableArea(Node* node)
{
for (auto ancestor = node; ancestor; ancestor = ancestor->parentOrShadowHostNode()) {
if (is<HTMLIFrameElement>(*ancestor) || is<HTMLHtmlElement>(*ancestor) || is<HTMLDocument>(*ancestor))
return nullptr;
auto renderer = ancestor->renderer();
if (!renderer)
continue;
if (is<RenderListBox>(*renderer))
return downcast<RenderListBox>(renderer);
return renderer->enclosingLayer();
}
return nullptr;
}
bool EventHandler::mouseMoved(const PlatformMouseEvent& event)
{
Ref<Frame> protectedFrame(m_frame);
RefPtr<FrameView> protector(m_frame.view());
MaximumDurationTracker maxDurationTracker(&m_maxMouseMovedDuration);
if (m_frame.page() && m_frame.page()->pageOverlayController().handleMouseEvent(event))
return true;
HitTestResult hoveredNode = HitTestResult(LayoutPoint());
bool result = handleMouseMoveEvent(event, &hoveredNode);
Page* page = m_frame.page();
if (!page)
return result;
if (auto scrolledArea = enclosingScrollableArea(hoveredNode.innerNode())) {
if (FrameView* frameView = m_frame.view()) {
if (frameView->containsScrollableArea(scrolledArea))
scrolledArea->mouseMovedInContentArea();
}
}
if (FrameView* frameView = m_frame.view())
frameView->mouseMovedInContentArea();
hoveredNode.setToNonUserAgentShadowAncestor();
page->chrome().mouseDidMoveOverElement(hoveredNode, event.modifierFlags());
page->chrome().setToolTip(hoveredNode);
return result;
}
bool EventHandler::passMouseMovedEventToScrollbars(const PlatformMouseEvent& event)
{
HitTestResult hoveredNode;
return handleMouseMoveEvent(event, &hoveredNode, true);
}
bool EventHandler::handleMouseMoveEvent(const PlatformMouseEvent& platformMouseEvent, HitTestResult* hoveredNode, bool onlyUpdateScrollbars)
{
#if ENABLE(TOUCH_EVENTS)
bool defaultPrevented = dispatchSyntheticTouchEventIfEnabled(platformMouseEvent);
if (defaultPrevented)
return true;
#endif
Ref<Frame> protectedFrame(m_frame);
RefPtr<FrameView> protector(m_frame.view());
#if ENABLE(POINTER_LOCK)
if (m_frame.page()->pointerLockController().isLocked()) {
m_frame.page()->pointerLockController().dispatchLockedMouseEvent(platformMouseEvent, eventNames().mousemoveEvent);
return true;
}
#endif
setLastKnownMousePosition(platformMouseEvent);
if (m_hoverTimer.isActive())
m_hoverTimer.stop();
#if ENABLE(CURSOR_SUPPORT)
m_cursorUpdateTimer.stop();
#endif
#if !ENABLE(IOS_TOUCH_EVENTS)
cancelFakeMouseMoveEvent();
#endif
if (m_svgPan) {
downcast<SVGDocument>(*m_frame.document()).updatePan(m_frame.view()->windowToContents(m_lastKnownMousePosition));
return true;
}
if (m_frameSetBeingResized)
return !dispatchMouseEvent(eventNames().mousemoveEvent, m_frameSetBeingResized.get(), false, 0, platformMouseEvent, false);
// On iOS, our scrollbars are managed by UIKit.
#if !PLATFORM(IOS_FAMILY)
// Send events right to a scrollbar if the mouse is pressed.
if (m_lastScrollbarUnderMouse && m_mousePressed)
return m_lastScrollbarUnderMouse->mouseMoved(platformMouseEvent);
#endif
HitTestRequest::HitTestRequestType hitType = HitTestRequest::Move | HitTestRequest::DisallowUserAgentShadowContent | HitTestRequest::AllowFrameScrollbars;
if (m_mousePressed)
hitType |= HitTestRequest::Active;
else if (onlyUpdateScrollbars) {
// Mouse events should be treated as "read-only" if we're updating only scrollbars. This
// means that :hover and :active freeze in the state they were in, rather than updating
// for nodes the mouse moves while the window is not key (which will be the case if
// onlyUpdateScrollbars is true).
hitType |= HitTestRequest::ReadOnly;
}
#if ENABLE(TOUCH_EVENTS) && !ENABLE(IOS_TOUCH_EVENTS)
// Treat any mouse move events as readonly if the user is currently touching the screen.
if (m_touchPressed)
hitType |= HitTestRequest::Active | HitTestRequest::ReadOnly;
#endif
HitTestRequest request(hitType);
MouseEventWithHitTestResults mouseEvent = prepareMouseEvent(request, platformMouseEvent);
if (hoveredNode)
*hoveredNode = mouseEvent.hitTestResult();
if (m_resizeLayer && m_resizeLayer->inResizeMode())
m_resizeLayer->resize(platformMouseEvent, m_offsetFromResizeCorner);
else {
Scrollbar* scrollbar = mouseEvent.scrollbar();
updateLastScrollbarUnderMouse(scrollbar, m_mousePressed ? SetOrClearLastScrollbar::Clear : SetOrClearLastScrollbar::Set);
// On iOS, our scrollbars are managed by UIKit.
#if !PLATFORM(IOS_FAMILY)
if (!m_mousePressed && scrollbar)
scrollbar->mouseMoved(platformMouseEvent); // Handle hover effects on platforms that support visual feedback on scrollbar hovering.
#endif
if (onlyUpdateScrollbars) {
if (shouldSendMouseEventsToInactiveWindows())
updateMouseEventTargetNode(mouseEvent.targetNode(), platformMouseEvent, FireMouseOverOut::Yes);
return true;
}
}
bool swallowEvent = false;
RefPtr<Frame> newSubframe = m_capturingMouseEventsElement.get() ? subframeForTargetNode(m_capturingMouseEventsElement.get()) : subframeForHitTestResult(mouseEvent);
// We want mouseouts to happen first, from the inside out. First send a move event to the last subframe so that it will fire mouseouts.
if (m_lastMouseMoveEventSubframe && m_lastMouseMoveEventSubframe->tree().isDescendantOf(&m_frame) && m_lastMouseMoveEventSubframe != newSubframe)
passMouseMoveEventToSubframe(mouseEvent, m_lastMouseMoveEventSubframe.get());
if (newSubframe) {
// Update over/out state before passing the event to the subframe.
updateMouseEventTargetNode(mouseEvent.targetNode(), platformMouseEvent, FireMouseOverOut::Yes);
// Event dispatch in updateMouseEventTargetNode may have caused the subframe of the target
// node to be detached from its FrameView, in which case the event should not be passed.
if (newSubframe->view())
swallowEvent |= passMouseMoveEventToSubframe(mouseEvent, newSubframe.get(), hoveredNode);
}
if (!newSubframe || mouseEvent.scrollbar()) {
#if ENABLE(CURSOR_SUPPORT)
if (auto* view = m_frame.view())
updateCursor(*view, mouseEvent.hitTestResult(), platformMouseEvent.shiftKey());
#endif
}
m_lastMouseMoveEventSubframe = newSubframe;
if (swallowEvent)
return true;
swallowEvent = !dispatchMouseEvent(eventNames().mousemoveEvent, mouseEvent.targetNode(), false, 0, platformMouseEvent, true);
#if ENABLE(DRAG_SUPPORT)
if (!swallowEvent)
swallowEvent = handleMouseDraggedEvent(mouseEvent);
#endif
return swallowEvent;
}
bool EventHandler::shouldSendMouseEventsToInactiveWindows() const
{
#if PLATFORM(GTK)
return true;
#endif
return false;
}
void EventHandler::invalidateClick()
{
m_clickCount = 0;
m_clickNode = nullptr;
}
static Node* targetNodeForClickEvent(Node* mousePressNode, Node* mouseReleaseNode)
{
if (!mousePressNode || !mouseReleaseNode)
return nullptr;
if (mousePressNode == mouseReleaseNode)
return mouseReleaseNode;
// If mousePressNode and mouseReleaseNode differ, we should fire the event at their common ancestor if there is one.
if (&mousePressNode->document() == &mouseReleaseNode->document()) {
if (auto* commonAncestor = Range::commonAncestorContainer(mousePressNode, mouseReleaseNode))
return commonAncestor;
}
Element* mouseReleaseShadowHost = mouseReleaseNode->shadowHost();
if (mouseReleaseShadowHost && mouseReleaseShadowHost == mousePressNode->shadowHost()) {
// We want to dispatch the click to the shadow tree host element to give listeners the illusion that the
// shadom tree is a single element. For example, we want to give the illusion that <input type="range">
// is a single element even though it is a composition of multiple shadom tree elements.
return mouseReleaseShadowHost;
}
return nullptr;
}
bool EventHandler::handleMouseReleaseEvent(const PlatformMouseEvent& platformMouseEvent)
{
Ref<Frame> protectedFrame(m_frame);
RefPtr<FrameView> protector(m_frame.view());
m_frame.selection().setCaretBlinkingSuspended(false);
#if ENABLE(POINTER_LOCK)
if (m_frame.page()->pointerLockController().isLocked()) {
m_frame.page()->pointerLockController().dispatchLockedMouseEvent(platformMouseEvent, eventNames().mouseupEvent);
return true;
}
#endif
if (m_frame.page()->pageOverlayController().handleMouseEvent(platformMouseEvent))
return true;
#if ENABLE(TOUCH_EVENTS)
bool defaultPrevented = dispatchSyntheticTouchEventIfEnabled(platformMouseEvent);
if (defaultPrevented)
return true;
#endif
UserGestureIndicator gestureIndicator(ProcessingUserGesture, m_frame.document());
#if ENABLE(PAN_SCROLLING)
m_autoscrollController->handleMouseReleaseEvent(platformMouseEvent);
#endif
m_mousePressed = false;
setLastKnownMousePosition(platformMouseEvent);
if (m_svgPan) {
m_svgPan = false;
downcast<SVGDocument>(*m_frame.document()).updatePan(m_frame.view()->windowToContents(m_lastKnownMousePosition));
return true;
}
if (m_frameSetBeingResized)
return !dispatchMouseEvent(eventNames().mouseupEvent, m_frameSetBeingResized.get(), true, m_clickCount, platformMouseEvent, false);
// If an immediate action began or was completed using this series of mouse events, then we should send mouseup to
// the DOM and return now so that we don't perform our own default behaviors.
if (m_immediateActionStage == ImmediateActionStage::ActionCompleted || m_immediateActionStage == ImmediateActionStage::ActionUpdated || m_immediateActionStage == ImmediateActionStage::ActionCancelledAfterUpdate) {
m_immediateActionStage = ImmediateActionStage::None;
return !dispatchMouseEvent(eventNames().mouseupEvent, m_lastElementUnderMouse.get(), true, m_clickCount, platformMouseEvent, false);
}
m_immediateActionStage = ImmediateActionStage::None;
if (m_lastScrollbarUnderMouse) {
invalidateClick();
m_lastScrollbarUnderMouse->mouseUp(platformMouseEvent);
bool cancelable = true;
bool setUnder = false;
return !dispatchMouseEvent(eventNames().mouseupEvent, m_lastElementUnderMouse.get(), cancelable, m_clickCount, platformMouseEvent, setUnder);
}
HitTestRequest request(HitTestRequest::Release | HitTestRequest::DisallowUserAgentShadowContent);
MouseEventWithHitTestResults mouseEvent = prepareMouseEvent(request, platformMouseEvent);
Frame* subframe = m_capturingMouseEventsElement.get() ? subframeForTargetNode(m_capturingMouseEventsElement.get()) : subframeForHitTestResult(mouseEvent);
if (m_eventHandlerWillResetCapturingMouseEventsElement)
m_capturingMouseEventsElement = nullptr;
if (subframe && passMouseReleaseEventToSubframe(mouseEvent, subframe))
return true;
bool swallowMouseUpEvent = !dispatchMouseEvent(eventNames().mouseupEvent, mouseEvent.targetNode(), true, m_clickCount, platformMouseEvent, false);
bool contextMenuEvent = platformMouseEvent.button() == RightButton;
Node* nodeToClick = targetNodeForClickEvent(m_clickNode.get(), mouseEvent.targetNode());
bool swallowClickEvent = m_clickCount > 0 && !contextMenuEvent && nodeToClick && !dispatchMouseEvent(eventNames().clickEvent, nodeToClick, true, m_clickCount, platformMouseEvent, true);
if (m_resizeLayer) {
m_resizeLayer->setInResizeMode(false);
m_resizeLayer = nullptr;
}
bool swallowMouseReleaseEvent = false;
if (!swallowMouseUpEvent)
swallowMouseReleaseEvent = handleMouseReleaseEvent(mouseEvent);
invalidateClick();
return swallowMouseUpEvent || swallowClickEvent || swallowMouseReleaseEvent;
}
#if ENABLE(MOUSE_FORCE_EVENTS)
bool EventHandler::handleMouseForceEvent(const PlatformMouseEvent& event)
{
Ref<Frame> protectedFrame(m_frame);
RefPtr<FrameView> protector(m_frame.view());
#if ENABLE(POINTER_LOCK)
if (m_frame.page()->pointerLockController().isLocked()) {
m_frame.page()->pointerLockController().dispatchLockedMouseEvent(event, eventNames().webkitmouseforcechangedEvent);
if (event.type() == PlatformEvent::MouseForceDown)
m_frame.page()->pointerLockController().dispatchLockedMouseEvent(event, eventNames().webkitmouseforcedownEvent);
if (event.type() == PlatformEvent::MouseForceUp)
m_frame.page()->pointerLockController().dispatchLockedMouseEvent(event, eventNames().webkitmouseforceupEvent);
return true;
}
#endif
setLastKnownMousePosition(event);
HitTestRequest::HitTestRequestType hitType = HitTestRequest::DisallowUserAgentShadowContent;
if (event.force())
hitType |= HitTestRequest::Active;
HitTestRequest request(hitType);
MouseEventWithHitTestResults mouseEvent = prepareMouseEvent(request, event);
bool swallowedEvent = !dispatchMouseEvent(eventNames().webkitmouseforcechangedEvent, mouseEvent.targetNode(), false, 0, event, false);
if (event.type() == PlatformEvent::MouseForceDown)
swallowedEvent |= !dispatchMouseEvent(eventNames().webkitmouseforcedownEvent, mouseEvent.targetNode(), false, 0, event, false);
if (event.type() == PlatformEvent::MouseForceUp)
swallowedEvent |= !dispatchMouseEvent(eventNames().webkitmouseforceupEvent, mouseEvent.targetNode(), false, 0, event, false);
return swallowedEvent;
}
#else
bool EventHandler::handleMouseForceEvent(const PlatformMouseEvent& )
{
return false;
}
#endif // #if ENABLE(MOUSE_FORCE_EVENTS)
bool EventHandler::handlePasteGlobalSelection(const PlatformMouseEvent& platformMouseEvent)
{
// If the event was a middle click, attempt to copy global selection in after
// the newly set caret position.
//
// This code is called from either the mouse up or mouse down handling. There
// is some debate about when the global selection is pasted:
// xterm: pastes on up.
// GTK: pastes on down.
// Qt: pastes on up.
// Firefox: pastes on up.
// Chromium: pastes on up.
//
// There is something of a webcompat angle to this well, as highlighted by
// crbug.com/14608. Pages can clear text boxes 'onclick' and, if we paste on
// down then the text is pasted just before the onclick handler runs and
// clears the text box. So it's important this happens after the event
// handlers have been fired.
#if PLATFORM(GTK)
if (platformMouseEvent.type() != PlatformEvent::MousePressed)
return false;
#else
if (platformMouseEvent.type() != PlatformEvent::MouseReleased)
return false;
#endif
if (!m_frame.page())
return false;
Frame& focusFrame = m_frame.page()->focusController().focusedOrMainFrame();
// Do not paste here if the focus was moved somewhere else.
if (&m_frame == &focusFrame && m_frame.editor().client()->supportsGlobalSelection())
return m_frame.editor().command("PasteGlobalSelection"_s).execute();
return false;
}
#if ENABLE(DRAG_SUPPORT)
bool EventHandler::dispatchDragEvent(const AtomString& eventType, Element& dragTarget, const PlatformMouseEvent& event, DataTransfer& dataTransfer)
{
Ref<Frame> protectedFrame(m_frame);
FrameView* view = m_frame.view();
// FIXME: We might want to dispatch a dragleave even if the view is gone.
if (!view)
return false;
view->disableLayerFlushThrottlingTemporarilyForInteraction();
// FIXME: Use MouseEvent::create which takes PlatformMouseEvent.
Ref<MouseEvent> me = MouseEvent::create(eventType, Event::CanBubble::Yes, Event::IsCancelable::Yes, Event::IsComposed::Yes,
event.timestamp().approximateMonotonicTime(), &m_frame.windowProxy(), 0,
event.globalPosition(), event.position(),
#if ENABLE(POINTER_LOCK)
event.movementDelta(),
#else
{ },
#endif
event.modifiers(), 0, 0, nullptr, event.force(), NoTap, &dataTransfer);
dragTarget.dispatchEvent(me);
return me->defaultPrevented();
}
static bool targetIsFrame(Node* target, Frame*& frame)
{
if (!is<HTMLFrameElementBase>(target))
return false;
frame = downcast<HTMLFrameElementBase>(*target).contentFrame();
return true;
}
static DragOperation convertDropZoneOperationToDragOperation(const String& dragOperation)
{
if (dragOperation == "copy")
return DragOperationCopy;
if (dragOperation == "move")
return DragOperationMove;
if (dragOperation == "link")
return DragOperationLink;
return DragOperationNone;
}
static String convertDragOperationToDropZoneOperation(DragOperation operation)
{
switch (operation) {
case DragOperationCopy:
return "copy"_s;
case DragOperationMove:
return "move"_s;
case DragOperationLink:
return "link"_s;
default:
return "copy"_s;
}
}
static bool hasDropZoneType(DataTransfer& dataTransfer, const String& keyword)
{
if (keyword.startsWith("file:"))
return dataTransfer.hasFileOfType(keyword.substring(5));
if (keyword.startsWith("string:"))
return dataTransfer.hasStringOfType(keyword.substring(7));
return false;
}
static bool findDropZone(Node& target, DataTransfer& dataTransfer)
{
RefPtr<Element> element = is<Element>(target) ? &downcast<Element>(target) : target.parentElement();
for (; element; element = element->parentElement()) {
SpaceSplitString keywords(element->attributeWithoutSynchronization(webkitdropzoneAttr), true);
bool matched = false;
DragOperation dragOperation = DragOperationNone;
for (unsigned i = 0, size = keywords.size(); i < size; ++i) {
DragOperation op = convertDropZoneOperationToDragOperation(keywords[i]);
if (op != DragOperationNone) {
if (dragOperation == DragOperationNone)
dragOperation = op;
} else
matched = matched || hasDropZoneType(dataTransfer, keywords[i].string());
if (matched && dragOperation != DragOperationNone)
break;
}
if (matched) {
dataTransfer.setDropEffect(convertDragOperationToDropZoneOperation(dragOperation));
return true;
}
}
return false;
}
EventHandler::DragTargetResponse EventHandler::dispatchDragEnterOrDragOverEvent(const AtomString& eventType, Element& target, const PlatformMouseEvent& event,
std::unique_ptr<Pasteboard>&& pasteboard, DragOperation sourceOperation, bool draggingFiles)
{
auto dataTransfer = DataTransfer::createForUpdatingDropTarget(target.document(), WTFMove(pasteboard), sourceOperation, draggingFiles);
bool accept = dispatchDragEvent(eventType, target, event, dataTransfer.get());
if (!accept)
accept = findDropZone(target, dataTransfer);
dataTransfer->makeInvalidForSecurity();
if (accept && !dataTransfer->dropEffectIsUninitialized())
return { true, dataTransfer->destinationOperation() };
return { accept, WTF::nullopt };
}
EventHandler::DragTargetResponse EventHandler::updateDragAndDrop(const PlatformMouseEvent& event, const std::function<std::unique_ptr<Pasteboard>()>& makePasteboard, DragOperation sourceOperation, bool draggingFiles)
{
Ref<Frame> protectedFrame(m_frame);
if (!m_frame.view())
return { };
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::DisallowUserAgentShadowContent);
MouseEventWithHitTestResults mouseEvent = prepareMouseEvent(request, event);
RefPtr<Element> newTarget;
if (Node* targetNode = mouseEvent.targetNode()) {
// Drag events should never go to non-element nodes (following IE, and proper mouseover/out dispatch)
if (!is<Element>(*targetNode))
newTarget = targetNode->parentOrShadowHostElement();
else
newTarget = downcast<Element>(targetNode);
}
m_autoscrollController->updateDragAndDrop(newTarget.get(), event.position(), event.timestamp());
DragTargetResponse response;
if (m_dragTarget != newTarget) {
// FIXME: this ordering was explicitly chosen to match WinIE. However,
// it is sometimes incorrect when dragging within subframes, as seen with
// LayoutTests/fast/events/drag-in-frames.html.
//
// Moreover, this ordering conforms to section 7.9.4 of the HTML 5 spec. <http://dev.w3.org/html5/spec/Overview.html#drag-and-drop-processing-model>.
Frame* targetFrame;
if (targetIsFrame(newTarget.get(), targetFrame)) {
if (targetFrame)
response = targetFrame->eventHandler().updateDragAndDrop(event, makePasteboard, sourceOperation, draggingFiles);
} else if (newTarget) {
// As per section 7.9.4 of the HTML 5 spec., we must always fire a drag event before firing a dragenter, dragleave, or dragover event.
if (dragState().source && dragState().shouldDispatchEvents)
dispatchDragSrcEvent(eventNames().dragEvent, event);
response = dispatchDragEnterOrDragOverEvent(eventNames().dragenterEvent, *newTarget, event, makePasteboard(), sourceOperation, draggingFiles);
}
if (targetIsFrame(m_dragTarget.get(), targetFrame)) {
// FIXME: Recursing again here doesn't make sense if the newTarget and m_dragTarget were in the same frame.
if (targetFrame)
response = targetFrame->eventHandler().updateDragAndDrop(event, makePasteboard, sourceOperation, draggingFiles);
} else if (m_dragTarget) {
auto dataTransfer = DataTransfer::createForUpdatingDropTarget(m_dragTarget->document(), makePasteboard(), sourceOperation, draggingFiles);
dispatchDragEvent(eventNames().dragleaveEvent, *m_dragTarget, event, dataTransfer.get());
dataTransfer->makeInvalidForSecurity();
}
if (newTarget) {
// We do not explicitly call dispatchDragEvent here because it could ultimately result in the appearance that
// two dragover events fired. So, we mark that we should only fire a dragover event on the next call to this function.
m_shouldOnlyFireDragOverEvent = true;
}
} else {
Frame* targetFrame;
if (targetIsFrame(newTarget.get(), targetFrame)) {
if (targetFrame)
response = targetFrame->eventHandler().updateDragAndDrop(event, makePasteboard, sourceOperation, draggingFiles);
} else if (newTarget) {
// Note, when dealing with sub-frames, we may need to fire only a dragover event as a drag event may have been fired earlier.
if (!m_shouldOnlyFireDragOverEvent && dragState().source && dragState().shouldDispatchEvents)
dispatchDragSrcEvent(eventNames().dragEvent, event);
response = dispatchDragEnterOrDragOverEvent(eventNames().dragoverEvent, *newTarget, event, makePasteboard(), sourceOperation, draggingFiles);
m_shouldOnlyFireDragOverEvent = false;
}
}
m_dragTarget = WTFMove(newTarget);
return response;
}
void EventHandler::cancelDragAndDrop(const PlatformMouseEvent& event, std::unique_ptr<Pasteboard>&& pasteboard, DragOperation sourceOperation, bool draggingFiles)
{
Ref<Frame> protectedFrame(m_frame);
Frame* targetFrame;
if (targetIsFrame(m_dragTarget.get(), targetFrame)) {
if (targetFrame)
targetFrame->eventHandler().cancelDragAndDrop(event, WTFMove(pasteboard), sourceOperation, draggingFiles);
} else if (m_dragTarget) {
if (dragState().source && dragState().shouldDispatchEvents)
dispatchDragSrcEvent(eventNames().dragEvent, event);
auto dataTransfer = DataTransfer::createForUpdatingDropTarget(m_dragTarget->document(), WTFMove(pasteboard), sourceOperation, draggingFiles);
dispatchDragEvent(eventNames().dragleaveEvent, *m_dragTarget, event, dataTransfer.get());
dataTransfer->makeInvalidForSecurity();
}
clearDragState();
}
bool EventHandler::performDragAndDrop(const PlatformMouseEvent& event, std::unique_ptr<Pasteboard>&& pasteboard, DragOperation sourceOperation, bool draggingFiles)
{
Ref<Frame> protectedFrame(m_frame);
Frame* targetFrame;
bool preventedDefault = false;
if (targetIsFrame(m_dragTarget.get(), targetFrame)) {
if (targetFrame)
preventedDefault = targetFrame->eventHandler().performDragAndDrop(event, WTFMove(pasteboard), sourceOperation, draggingFiles);
} else if (m_dragTarget) {
auto dataTransfer = DataTransfer::createForDrop(m_dragTarget->document(), WTFMove(pasteboard), sourceOperation, draggingFiles);
preventedDefault = dispatchDragEvent(eventNames().dropEvent, *m_dragTarget, event, dataTransfer);
dataTransfer->makeInvalidForSecurity();
}
clearDragState();
return preventedDefault;
}
void EventHandler::clearDragState()
{
stopAutoscrollTimer();
m_dragTarget = nullptr;
m_capturingMouseEventsElement = nullptr;
m_shouldOnlyFireDragOverEvent = false;
#if PLATFORM(COCOA)
m_sendingEventToSubview = false;
#endif
}
#endif // ENABLE(DRAG_SUPPORT)
void EventHandler::setCapturingMouseEventsElement(Element* element)
{
m_capturingMouseEventsElement = element;
m_eventHandlerWillResetCapturingMouseEventsElement = false;
}
#if ENABLE(POINTER_EVENTS)
void EventHandler::pointerCaptureElementDidChange(Element* element)
{
if (m_capturingMouseEventsElement == element)
return;
setCapturingMouseEventsElement(element);
// Now that we have a new capture element, we need to dispatch boundary mouse events.
updateMouseEventTargetNode(element, m_lastPlatformMouseEvent, FireMouseOverOut::Yes);
}
#endif
MouseEventWithHitTestResults EventHandler::prepareMouseEvent(const HitTestRequest& request, const PlatformMouseEvent& mouseEvent)
{
#if ENABLE(POINTER_EVENTS)
m_lastPlatformMouseEvent = mouseEvent;
#endif
Ref<Frame> protectedFrame(m_frame);
ASSERT(m_frame.document());
return m_frame.document()->prepareMouseEvent(request, documentPointForWindowPoint(m_frame, mouseEvent.position()), mouseEvent);
}
static bool hierarchyHasCapturingEventListeners(Element* element, const AtomString& pointerEventName, const AtomString& compatibilityMouseEventName)
{
for (ContainerNode* curr = element; curr; curr = curr->parentInComposedTree()) {
if (curr->hasCapturingEventListeners(pointerEventName) || curr->hasCapturingEventListeners(compatibilityMouseEventName))
return true;
}
return false;
}
void EventHandler::updateMouseEventTargetNode(Node* targetNode, const PlatformMouseEvent& platformMouseEvent, FireMouseOverOut fireMouseOverOut)
{
Ref<Frame> protectedFrame(m_frame);
Element* targetElement = nullptr;
// If we're capturing, we always go right to that element.
if (m_capturingMouseEventsElement)
targetElement = m_capturingMouseEventsElement.get();
else if (targetNode) {
// If the target node is a non-element, dispatch on the parent. <rdar://problem/4196646>
while (targetNode && !is<Element>(*targetNode))
targetNode = targetNode->parentInComposedTree();
targetElement = downcast<Element>(targetNode);
}
m_elementUnderMouse = targetElement;
// Fire mouseout/mouseover if the mouse has shifted to a different node.
if (fireMouseOverOut == FireMouseOverOut::Yes) {
auto scrollableAreaForLastNode = enclosingScrollableArea(m_lastElementUnderMouse.get());
auto scrollableAreaForNodeUnderMouse = enclosingScrollableArea(m_elementUnderMouse.get());
Page* page = m_frame.page();
if (m_lastElementUnderMouse && (!m_elementUnderMouse || &m_elementUnderMouse->document() != m_frame.document())) {
// The mouse has moved between frames.
if (Frame* frame = m_lastElementUnderMouse->document().frame()) {
if (FrameView* frameView = frame->view())
frameView->mouseExitedContentArea();
}
} else if (page && (scrollableAreaForLastNode && (!scrollableAreaForNodeUnderMouse || scrollableAreaForNodeUnderMouse != scrollableAreaForLastNode))) {
// The mouse has moved between layers.
if (Frame* frame = m_lastElementUnderMouse->document().frame()) {
if (FrameView* frameView = frame->view()) {
if (frameView->containsScrollableArea(scrollableAreaForLastNode))
scrollableAreaForLastNode->mouseExitedContentArea();
}
}
}
if (m_elementUnderMouse && (!m_lastElementUnderMouse || &m_lastElementUnderMouse->document() != m_frame.document())) {
// The mouse has moved between frames.
if (Frame* frame = m_elementUnderMouse->document().frame()) {
if (FrameView* frameView = frame->view())
frameView->mouseEnteredContentArea();
}
} else if (page && (scrollableAreaForNodeUnderMouse && (!scrollableAreaForLastNode || scrollableAreaForNodeUnderMouse != scrollableAreaForLastNode))) {
// The mouse has moved between layers.
if (Frame* frame = m_elementUnderMouse->document().frame()) {
if (FrameView* frameView = frame->view()) {
if (frameView->containsScrollableArea(scrollableAreaForNodeUnderMouse))
scrollableAreaForNodeUnderMouse->mouseEnteredContentArea();
}
}
}
if (m_lastElementUnderMouse && &m_lastElementUnderMouse->document() != m_frame.document()) {
m_lastElementUnderMouse = nullptr;
m_lastScrollbarUnderMouse = nullptr;
}
if (m_lastElementUnderMouse != m_elementUnderMouse) {
// mouseenter and mouseleave events are only dispatched if there is a capturing eventhandler on an ancestor
// or a normal eventhandler on the element itself (they don't bubble).
// This optimization is necessary since these events can cause O(n^2) capturing event-handler checks.
bool hasCapturingMouseEnterListener = hierarchyHasCapturingEventListeners(m_elementUnderMouse.get(), eventNames().pointerenterEvent, eventNames().mouseenterEvent);
bool hasCapturingMouseLeaveListener = hierarchyHasCapturingEventListeners(m_lastElementUnderMouse.get(), eventNames().pointerleaveEvent, eventNames().mouseleaveEvent);
Vector<Ref<Element>, 32> leftElementsChain;
for (Element* element = m_lastElementUnderMouse.get(); element; element = element->parentElementInComposedTree())
leftElementsChain.append(*element);
Vector<Ref<Element>, 32> enteredElementsChain;
for (Element* element = m_elementUnderMouse.get(); element; element = element->parentElementInComposedTree())
enteredElementsChain.append(*element);
if (!leftElementsChain.isEmpty() && !enteredElementsChain.isEmpty() && leftElementsChain.last().ptr() == enteredElementsChain.last().ptr()) {
size_t minHeight = std::min(leftElementsChain.size(), enteredElementsChain.size());
size_t i;
for (i = 0; i < minHeight; ++i) {
if (leftElementsChain[leftElementsChain.size() - i - 1].ptr() != enteredElementsChain[enteredElementsChain.size() - i - 1].ptr())
break;
}
leftElementsChain.shrink(leftElementsChain.size() - i);
enteredElementsChain.shrink(enteredElementsChain.size() - i);
}
if (m_lastElementUnderMouse)
m_lastElementUnderMouse->dispatchMouseEvent(platformMouseEvent, eventNames().mouseoutEvent, 0, m_elementUnderMouse.get());
for (auto& chain : leftElementsChain) {
if (hasCapturingMouseLeaveListener || chain->hasEventListeners(eventNames().pointerleaveEvent) || chain->hasEventListeners(eventNames().mouseleaveEvent))
chain->dispatchMouseEvent(platformMouseEvent, eventNames().mouseleaveEvent, 0, m_elementUnderMouse.get());
}
if (m_elementUnderMouse)
m_elementUnderMouse->dispatchMouseEvent(platformMouseEvent, eventNames().mouseoverEvent, 0, m_lastElementUnderMouse.get());
for (auto& chain : WTF::makeReversedRange(enteredElementsChain)) {
if (hasCapturingMouseEnterListener || chain->hasEventListeners(eventNames().pointerenterEvent) || chain->hasEventListeners(eventNames().mouseenterEvent))
chain->dispatchMouseEvent(platformMouseEvent, eventNames().mouseenterEvent, 0, m_lastElementUnderMouse.get());
}
}
m_lastElementUnderMouse = m_elementUnderMouse;
}
}
static RefPtr<Element> findFirstMouseFocusableElementInComposedTree(Element& host)
{
ASSERT(host.shadowRoot());
for (auto& node : composedTreeDescendants(host)) {
if (!is<Element>(node))
continue;
auto& element = downcast<Element>(node);
if (element.isMouseFocusable())
return &element;
}
return nullptr;
}
bool EventHandler::dispatchMouseEvent(const AtomString& eventType, Node* targetNode, bool /*cancelable*/, int clickCount, const PlatformMouseEvent& platformMouseEvent, bool setUnder)
{
Ref<Frame> protectedFrame(m_frame);
if (auto* view = m_frame.view())
view->disableLayerFlushThrottlingTemporarilyForInteraction();
updateMouseEventTargetNode(targetNode, platformMouseEvent, setUnder ? FireMouseOverOut::Yes : FireMouseOverOut::No);
if (m_elementUnderMouse && !m_elementUnderMouse->dispatchMouseEvent(platformMouseEvent, eventType, clickCount))
return false;
if (eventType != eventNames().mousedownEvent)
return true;
// If clicking on a frame scrollbar, do not make any change to which element is focused.
auto* view = m_frame.view();
if (view && view->scrollbarAtPoint(platformMouseEvent.position()))
return true;
// The layout needs to be up to date to determine if an element is focusable.
m_frame.document()->updateLayoutIgnorePendingStylesheets();
// Remove focus from the currently focused element when a link or button is clicked.
// This is expected by some sites that rely on change event handlers running
// from form fields before the button click is processed, behavior that was inherited
// from the user interface of Windows, where pushing a button moves focus to the button.
// Walk up the DOM tree to search for an element to focus.
RefPtr<Element> element;
for (element = m_elementUnderMouse.get(); element; element = element->parentElementInComposedTree()) {
if (auto* shadowRoot = element->shadowRoot()) {
if (shadowRoot->delegatesFocus()) {
element = findFirstMouseFocusableElementInComposedTree(*element);
break;
}
}
if (element->isMouseFocusable())
break;
}
// To fix <rdar://problem/4895428> Can't drag selected ToDo, we don't focus an
// element on mouse down if it's selected and inside a focused element. It will be
// focused if the user does a mouseup over it, however, because the mouseup
// will set a selection inside it, which will also set the focused element.
if (element && m_frame.selection().isRange()) {
if (auto range = m_frame.selection().toNormalizedRange()) {
auto result = range->compareNode(*element);
if (!result.hasException() && result.releaseReturnValue() == Range::NODE_INSIDE && element->isDescendantOf(m_frame.document()->focusedElement()))
return true;
}
}
// Only change the focus when clicking scrollbars if it can be transferred to a mouse focusable node.
if (!element && isInsideScrollbar(platformMouseEvent.position()))
return false;
// If focus shift is blocked, we eat the event.
auto* page = m_frame.page();
if (page && !page->focusController().setFocusedElement(element.get(), m_frame))
return false;
return true;
}
bool EventHandler::isInsideScrollbar(const IntPoint& windowPoint) const
{
if (auto* document = m_frame.document()) {
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::DisallowUserAgentShadowContent);
HitTestResult result(windowPoint);
document->hitTest(request, result);
return result.scrollbar();
}
return false;
}
#if !USE(GLIB)
bool EventHandler::shouldSwapScrollDirection(const HitTestResult&, const PlatformWheelEvent&) const
{
return false;
}
#endif
#if !PLATFORM(MAC)
void EventHandler::platformPrepareForWheelEvents(const PlatformWheelEvent&, const HitTestResult&, RefPtr<Element>&, RefPtr<ContainerNode>&, WeakPtr<ScrollableArea>&, bool&)
{
}
void EventHandler::platformRecordWheelEvent(const PlatformWheelEvent& event)
{
if (auto* page = m_frame.page())
page->wheelEventDeltaFilter()->updateFromDelta(FloatSize(event.deltaX(), event.deltaY()));
}
bool EventHandler::platformCompleteWheelEvent(const PlatformWheelEvent& event, ContainerNode*, const WeakPtr<ScrollableArea>&)
{
Ref<Frame> protectedFrame(m_frame);
// We do another check on the frame view because the event handler can run JS which results in the frame getting destroyed.
FrameView* view = m_frame.view();
bool didHandleEvent = view ? view->wheelEvent(event) : false;
m_isHandlingWheelEvent = false;
return didHandleEvent;
}
bool EventHandler::platformCompletePlatformWidgetWheelEvent(const PlatformWheelEvent&, const Widget&, ContainerNode*)
{
return true;
}
void EventHandler::platformNotifyIfEndGesture(const PlatformWheelEvent&, const WeakPtr<ScrollableArea>&)
{
}
void EventHandler::clearOrScheduleClearingLatchedStateIfNeeded(const PlatformWheelEvent&)
{
clearLatchedState();
}
#if !PLATFORM(IOS_FAMILY)
IntPoint EventHandler::targetPositionInWindowForSelectionAutoscroll() const
{
return m_lastKnownMousePosition;
}
#endif // !PLATFORM(IOS_FAMILY)
#endif // !PLATFORM(MAC)
#if !PLATFORM(IOS_FAMILY)
bool EventHandler::shouldUpdateAutoscroll()
{
return mousePressed();
}
#endif // !PLATFORM(IOS_FAMILY)
Widget* EventHandler::widgetForEventTarget(Element* eventTarget)
{
if (!eventTarget)
return nullptr;
auto* target = eventTarget->renderer();
if (!is<RenderWidget>(target))
return nullptr;
return downcast<RenderWidget>(*target).widget();
}
static WeakPtr<Widget> widgetForElement(const Element& element)
{
auto target = element.renderer();
if (!is<RenderWidget>(target) || !downcast<RenderWidget>(*target).widget())
return { };
return makeWeakPtr(*downcast<RenderWidget>(*target).widget());
}
bool EventHandler::completeWidgetWheelEvent(const PlatformWheelEvent& event, const WeakPtr<Widget>& widget, const WeakPtr<ScrollableArea>& scrollableArea, ContainerNode* scrollableContainer)
{
m_isHandlingWheelEvent = false;
// We do another check on the widget because the event handler can run JS which results in the frame getting destroyed.
if (!widget)
return false;
if (scrollableArea)
scrollableArea->setScrollShouldClearLatchedState(false);
platformNotifyIfEndGesture(event, scrollableArea);
if (!widget->platformWidget())
return true;
return platformCompletePlatformWidgetWheelEvent(event, *widget.get(), scrollableContainer);
}
bool EventHandler::handleWheelEvent(const PlatformWheelEvent& event)
{
auto* document = m_frame.document();
if (!document)
return false;
Ref<Frame> protectedFrame(m_frame);
RefPtr<FrameView> protector(m_frame.view());
FrameView* view = m_frame.view();
if (!view)
return false;
#if ENABLE(POINTER_LOCK)
if (m_frame.page()->pointerLockController().isLocked()) {
m_frame.page()->pointerLockController().dispatchLockedWheelEvent(event);
return true;
}
#endif
m_isHandlingWheelEvent = true;
setFrameWasScrolledByUser();
HitTestRequest request;
HitTestResult result(view->windowToContents(event.position()));
document->hitTest(request, result);
RefPtr<Element> element = result.targetElement();
RefPtr<ContainerNode> scrollableContainer;
WeakPtr<ScrollableArea> scrollableArea;
bool isOverWidget = result.isOverWidget();
platformPrepareForWheelEvents(event, result, element, scrollableContainer, scrollableArea, isOverWidget);
#if PLATFORM(MAC)
if (event.phase() == PlatformWheelEventPhaseNone && event.momentumPhase() == PlatformWheelEventPhaseNone && m_frame.page())
m_frame.page()->resetLatchingState();
#endif
// FIXME: It should not be necessary to do this mutation here.
// Instead, the handlers should know convert vertical scrolls appropriately.
PlatformWheelEvent adjustedEvent = shouldSwapScrollDirection(result, event) ? event.copySwappingDirection() : event;
platformRecordWheelEvent(adjustedEvent);
if (element) {
if (isOverWidget) {
if (WeakPtr<Widget> widget = widgetForElement(*element)) {
if (widgetDidHandleWheelEvent(event, *widget.get()))
return completeWidgetWheelEvent(adjustedEvent, widget, scrollableArea, scrollableContainer.get());
}
}
if (!element->dispatchWheelEvent(adjustedEvent)) {
m_isHandlingWheelEvent = false;
if (scrollableArea && scrollableArea->scrollShouldClearLatchedState()) {
// Web developer is controlling scrolling, so don't attempt to latch.
clearLatchedState();
scrollableArea->setScrollShouldClearLatchedState(false);
}
platformNotifyIfEndGesture(adjustedEvent, scrollableArea);
return true;
}
}
if (scrollableArea)
scrollableArea->setScrollShouldClearLatchedState(false);
bool handledEvent = platformCompleteWheelEvent(adjustedEvent, scrollableContainer.get(), scrollableArea);
platformNotifyIfEndGesture(adjustedEvent, scrollableArea);
return handledEvent;
}
void EventHandler::clearLatchedState()
{
auto* page = m_frame.page();
if (!page)
return;
#if PLATFORM(MAC)
page->resetLatchingState();
#endif
if (auto filter = page->wheelEventDeltaFilter())
filter->endFilteringDeltas();
}
void EventHandler::defaultWheelEventHandler(Node* startNode, WheelEvent& wheelEvent)
{
if (!startNode)
return;
auto protectedFrame = makeRef(m_frame);
FloatSize filteredPlatformDelta(wheelEvent.deltaX(), wheelEvent.deltaY());
FloatSize filteredVelocity;
if (auto platformWheelEvent = wheelEvent.underlyingPlatformEvent()) {
filteredPlatformDelta.setWidth(platformWheelEvent->deltaX());
filteredPlatformDelta.setHeight(platformWheelEvent->deltaY());
}
#if PLATFORM(MAC)
ScrollLatchingState* latchedState = m_frame.page() ? m_frame.page()->latchingState() : nullptr;
Element* stopElement = latchedState ? latchedState->previousWheelScrolledElement() : nullptr;
if (m_frame.page() && m_frame.page()->wheelEventDeltaFilter()->isFilteringDeltas()) {
filteredPlatformDelta = m_frame.page()->wheelEventDeltaFilter()->filteredDelta();
filteredVelocity = m_frame.page()->wheelEventDeltaFilter()->filteredVelocity();
}
#else
Element* stopElement = nullptr;
#endif
if (handleWheelEventInAppropriateEnclosingBox(startNode, wheelEvent, &stopElement, filteredPlatformDelta, filteredVelocity))
wheelEvent.setDefaultHandled();
#if PLATFORM(MAC)
if (latchedState && !latchedState->wheelEventElement())
latchedState->setPreviousWheelScrolledElement(stopElement);
#endif
}
#if ENABLE(CONTEXT_MENUS)
bool EventHandler::sendContextMenuEvent(const PlatformMouseEvent& event)
{
Ref<Frame> protectedFrame(m_frame);
Document* doc = m_frame.document();
FrameView* view = m_frame.view();
if (!view)
return false;
// Caret blinking is normally un-suspended in handleMouseReleaseEvent, but we
// won't receive that event once the context menu is up.
m_frame.selection().setCaretBlinkingSuspended(false);
// Clear mouse press state to avoid initiating a drag while context menu is up.
m_mousePressed = false;
bool swallowEvent;
LayoutPoint viewportPos = view->windowToContents(event.position());
HitTestRequest request(HitTestRequest::Active | HitTestRequest::DisallowUserAgentShadowContent);
MouseEventWithHitTestResults mouseEvent = doc->prepareMouseEvent(request, viewportPos, event);
// Do not show context menus when clicking on scrollbars.
if (mouseEvent.scrollbar() || view->scrollbarAtPoint(event.position()))
return false;
if (m_frame.editor().behavior().shouldSelectOnContextualMenuClick()
&& !m_frame.selection().contains(viewportPos)
// FIXME: In the editable case, word selection sometimes selects content that isn't underneath the mouse.
// If the selection is non-editable, we do word selection to make it easier to use the contextual menu items
// available for text selections. But only if we're above text.
&& (m_frame.selection().selection().isContentEditable() || (mouseEvent.targetNode() && mouseEvent.targetNode()->isTextNode()))) {
m_mouseDownMayStartSelect = true; // context menu events are always allowed to perform a selection
selectClosestContextualWordOrLinkFromMouseEvent(mouseEvent);
}
swallowEvent = !dispatchMouseEvent(eventNames().contextmenuEvent, mouseEvent.targetNode(), true, 0, event, false);
return swallowEvent;
}
bool EventHandler::sendContextMenuEventForKey()
{
Ref<Frame> protectedFrame(m_frame);
FrameView* view = m_frame.view();
if (!view)
return false;
Document* doc = m_frame.document();
if (!doc)
return false;
// Clear mouse press state to avoid initiating a drag while context menu is up.
m_mousePressed = false;
static const int kContextMenuMargin = 1;
#if OS(WINDOWS)
int rightAligned = ::GetSystemMetrics(SM_MENUDROPALIGNMENT);
#else
int rightAligned = 0;
#endif
IntPoint location;
Element* focusedElement = doc->focusedElement();
const VisibleSelection& selection = m_frame.selection().selection();
Position start = selection.start();
if (start.deprecatedNode() && (selection.rootEditableElement() || selection.isRange())) {
RefPtr<Range> selectionRange = selection.toNormalizedRange();
IntRect firstRect = m_frame.editor().firstRectForRange(selectionRange.get());
int x = rightAligned ? firstRect.maxX() : firstRect.x();
// In a multiline edit, firstRect.maxY() would endup on the next line, so -1.
int y = firstRect.maxY() ? firstRect.maxY() - 1 : 0;
location = IntPoint(x, y);
} else if (focusedElement) {
RenderBoxModelObject* box = focusedElement->renderBoxModelObject();
if (!box)
return false;
IntRect boundingBoxRect = box->absoluteBoundingBoxRect(true);
location = IntPoint(boundingBoxRect.x(), boundingBoxRect.maxY() - 1);
} else {
location = IntPoint(
rightAligned ? view->contentsWidth() - kContextMenuMargin : kContextMenuMargin,
kContextMenuMargin);
}
m_frame.view()->setCursor(pointerCursor());
IntPoint position = view->contentsToRootView(location);
IntPoint globalPosition = view->hostWindow()->rootViewToScreen(IntRect(position, IntSize())).location();
Node* targetNode = doc->focusedElement();
if (!targetNode)
targetNode = doc;
// Use the focused node as the target for hover and active.
HitTestResult result(position);
result.setInnerNode(targetNode);
doc->updateHoverActiveState(HitTestRequest::Active | HitTestRequest::DisallowUserAgentShadowContent, result.targetElement());
// The contextmenu event is a mouse event even when invoked using the keyboard.
// This is required for web compatibility.
#if OS(WINDOWS)
PlatformEvent::Type eventType = PlatformEvent::MouseReleased;
#else
PlatformEvent::Type eventType = PlatformEvent::MousePressed;
#endif
PlatformMouseEvent platformMouseEvent(position, globalPosition, RightButton, eventType, 1, false, false, false, false, WallTime::now(), ForceAtClick, NoTap);
return sendContextMenuEvent(platformMouseEvent);
}
#endif // ENABLE(CONTEXT_MENUS)
void EventHandler::scheduleHoverStateUpdate()
{
if (!m_hoverTimer.isActive())
m_hoverTimer.startOneShot(0_s);
}
#if ENABLE(CURSOR_SUPPORT)
void EventHandler::scheduleCursorUpdate()
{
if (!m_cursorUpdateTimer.isActive())
m_cursorUpdateTimer.startOneShot(cursorUpdateInterval);
}
#endif
void EventHandler::dispatchFakeMouseMoveEventSoon()
{
#if !ENABLE(IOS_TOUCH_EVENTS)
if (m_mousePressed)
return;
if (m_mousePositionIsUnknown)
return;
if (Page* page = m_frame.page()) {
if (!page->chrome().client().shouldDispatchFakeMouseMoveEvents())
return;
}
// If the content has ever taken longer than fakeMouseMoveShortInterval we
// reschedule the timer and use a longer time. This will cause the content
// to receive these moves only after the user is done scrolling, reducing
// pauses during the scroll.
if (m_fakeMouseMoveEventTimer.isActive())
m_fakeMouseMoveEventTimer.stop();
m_fakeMouseMoveEventTimer.startOneShot(m_maxMouseMovedDuration > fakeMouseMoveDurationThreshold ? fakeMouseMoveLongInterval : fakeMouseMoveShortInterval);
#endif
}
void EventHandler::dispatchFakeMouseMoveEventSoonInQuad(const FloatQuad& quad)
{
#if ENABLE(IOS_TOUCH_EVENTS)
UNUSED_PARAM(quad);
#else
FrameView* view = m_frame.view();
if (!view)
return;
if (!quad.containsPoint(view->windowToContents(m_lastKnownMousePosition)))
return;
dispatchFakeMouseMoveEventSoon();
#endif
}
#if !ENABLE(IOS_TOUCH_EVENTS)
void EventHandler::cancelFakeMouseMoveEvent()
{
m_fakeMouseMoveEventTimer.stop();
}
void EventHandler::fakeMouseMoveEventTimerFired()
{
ASSERT(!m_mousePressed);
FrameView* view = m_frame.view();
if (!view)
return;
if (!m_frame.page() || !m_frame.page()->isVisible() || !m_frame.page()->focusController().isActive())
return;
bool shiftKey;
bool ctrlKey;
bool altKey;
bool metaKey;
PlatformKeyboardEvent::getCurrentModifierState(shiftKey, ctrlKey, altKey, metaKey);
PlatformMouseEvent fakeMouseMoveEvent(m_lastKnownMousePosition, m_lastKnownMouseGlobalPosition, NoButton, PlatformEvent::MouseMoved, 0, shiftKey, ctrlKey, altKey, metaKey, WallTime::now(), 0, NoTap);
mouseMoved(fakeMouseMoveEvent);
}
#endif // !ENABLE(IOS_TOUCH_EVENTS)
void EventHandler::setResizingFrameSet(HTMLFrameSetElement* frameSet)
{
m_frameSetBeingResized = frameSet;
}
void EventHandler::resizeLayerDestroyed()
{
ASSERT(m_resizeLayer);
m_resizeLayer = nullptr;
}
void EventHandler::hoverTimerFired()
{
m_hoverTimer.stop();
ASSERT(m_frame.document());
Ref<Frame> protectedFrame(m_frame);
if (auto* document = m_frame.document()) {
if (FrameView* view = m_frame.view()) {
HitTestRequest request(HitTestRequest::Move | HitTestRequest::DisallowUserAgentShadowContent);
HitTestResult result(view->windowToContents(m_lastKnownMousePosition));
document->hitTest(request, result);
document->updateHoverActiveState(request, result.targetElement());
}
}
}
bool EventHandler::handleAccessKey(const PlatformKeyboardEvent& event)
{
// FIXME: Ignoring the state of Shift key is what neither IE nor Firefox do.
// IE matches lower and upper case access keys regardless of Shift key state - but if both upper and
// lower case variants are present in a document, the correct element is matched based on Shift key state.
// Firefox only matches an access key if Shift is not pressed, and does that case-insensitively.
ASSERT(!accessKeyModifiers().contains(PlatformEvent::Modifier::ShiftKey));
if ((event.modifiers() - PlatformEvent::Modifier::ShiftKey) != accessKeyModifiers())
return false;
auto* element = m_frame.document()->elementForAccessKey(event.unmodifiedText());
if (!element)
return false;
element->accessKeyAction(false);
return true;
}
#if !PLATFORM(MAC)
bool EventHandler::needsKeyboardEventDisambiguationQuirks() const
{
return false;
}
#endif
#if ENABLE(FULLSCREEN_API)
bool EventHandler::isKeyEventAllowedInFullScreen(const PlatformKeyboardEvent& keyEvent) const
{
Document* document = m_frame.document();
if (document->fullscreenManager().isFullscreenKeyboardInputAllowed())
return true;
if (keyEvent.type() == PlatformKeyboardEvent::Char) {
if (keyEvent.text().length() != 1)
return false;
UChar character = keyEvent.text()[0];
return character == ' ';
}
int keyCode = keyEvent.windowsVirtualKeyCode();
return (keyCode >= VK_BACK && keyCode <= VK_CAPITAL)
|| (keyCode >= VK_SPACE && keyCode <= VK_DELETE)
|| (keyCode >= VK_OEM_1 && keyCode <= VK_OEM_PLUS)
|| (keyCode >= VK_MULTIPLY && keyCode <= VK_OEM_8);
}
#endif
bool EventHandler::keyEvent(const PlatformKeyboardEvent& keyEvent)
{
Document* topDocument = m_frame.document() ? &m_frame.document()->topDocument() : nullptr;
MonotonicTime savedLastHandledUserGestureTimestamp;
bool savedUserDidInteractWithPage = topDocument ? topDocument->userDidInteractWithPage() : false;
if (m_frame.document())
savedLastHandledUserGestureTimestamp = m_frame.document()->lastHandledUserGestureTimestamp();
bool wasHandled = internalKeyEvent(keyEvent);
// If the key event was not handled, do not treat it as user interaction with the page.
if (topDocument) {
if (!wasHandled)
topDocument->setUserDidInteractWithPage(savedUserDidInteractWithPage);
else
ResourceLoadObserver::shared().logUserInteractionWithReducedTimeResolution(*topDocument);
}
if (!wasHandled && m_frame.document())
m_frame.document()->updateLastHandledUserGestureTimestamp(savedLastHandledUserGestureTimestamp);
return wasHandled;
}
void EventHandler::capsLockStateMayHaveChanged() const
{
auto* focusedElement = m_frame.document()->focusedElement();
if (!is<HTMLInputElement>(focusedElement))
return;
downcast<HTMLInputElement>(*focusedElement).capsLockStateMayHaveChanged();
}
bool EventHandler::internalKeyEvent(const PlatformKeyboardEvent& initialKeyEvent)
{
Ref<Frame> protectedFrame(m_frame);
RefPtr<FrameView> protector(m_frame.view());
LOG(Editing, "EventHandler %p keyEvent (text %s keyIdentifier %s)", this, initialKeyEvent.text().utf8().data(), initialKeyEvent.keyIdentifier().utf8().data());
#if ENABLE(POINTER_LOCK)
if (initialKeyEvent.type() == PlatformEvent::KeyDown && initialKeyEvent.windowsVirtualKeyCode() == VK_ESCAPE && m_frame.page()->pointerLockController().element()) {
m_frame.page()->pointerLockController().requestPointerUnlockAndForceCursorVisible();
}
#endif
if (initialKeyEvent.type() == PlatformEvent::KeyDown && initialKeyEvent.windowsVirtualKeyCode() == VK_ESCAPE) {
if (auto* page = m_frame.page()) {
if (auto* validationMessageClient = page->validationMessageClient())
validationMessageClient->hideAnyValidationMessage();
}
}
#if ENABLE(FULLSCREEN_API)
if (m_frame.document()->fullscreenManager().isFullscreen()) {
if (initialKeyEvent.type() == PlatformEvent::KeyDown && initialKeyEvent.windowsVirtualKeyCode() == VK_ESCAPE) {
m_frame.document()->fullscreenManager().cancelFullscreen();
return true;
}
if (!isKeyEventAllowedInFullScreen(initialKeyEvent))
return false;
}
#endif
if (initialKeyEvent.windowsVirtualKeyCode() == VK_CAPITAL)
capsLockStateMayHaveChanged();
#if ENABLE(PAN_SCROLLING)
if (m_frame.mainFrame().eventHandler().panScrollInProgress()) {
// If a key is pressed while the panScroll is in progress then we want to stop
if (initialKeyEvent.type() == PlatformEvent::KeyDown || initialKeyEvent.type() == PlatformEvent::RawKeyDown)
stopAutoscrollTimer();
// If we were in panscroll mode, we swallow the key event
return true;
}
#endif
// Check for cases where we are too early for events -- possible unmatched key up
// from pressing return in the location bar.
RefPtr<Element> element = eventTargetElementForDocument(m_frame.document());
if (!element)
return false;
UserGestureType gestureType = UserGestureType::Other;
if (initialKeyEvent.windowsVirtualKeyCode() == VK_ESCAPE)
gestureType = UserGestureType::EscapeKey;
UserGestureIndicator gestureIndicator(ProcessingUserGesture, m_frame.document(), gestureType, UserGestureIndicator::ProcessInteractionStyle::Delayed);
UserTypingGestureIndicator typingGestureIndicator(m_frame);
if (FrameView* view = m_frame.view())
view->disableLayerFlushThrottlingTemporarilyForInteraction();
// FIXME (bug 68185): this call should be made at another abstraction layer
m_frame.loader().resetMultipleFormSubmissionProtection();
// In IE, access keys are special, they are handled after default keydown processing, but cannot be canceled - this is hard to match.
// On Mac OS X, we process them before dispatching keydown, as the default keydown handler implements Emacs key bindings, which may conflict
// with access keys. Then we dispatch keydown, but suppress its default handling.
// On Windows, WebKit explicitly calls handleAccessKey() instead of dispatching a keypress event for WM_SYSCHAR messages.
// Other platforms currently match either Mac or Windows behavior, depending on whether they send combined KeyDown events.
bool matchedAnAccessKey = false;
if (initialKeyEvent.type() == PlatformEvent::KeyDown)
matchedAnAccessKey = handleAccessKey(initialKeyEvent);
// FIXME: it would be fair to let an input method handle KeyUp events before DOM dispatch.
if (initialKeyEvent.type() == PlatformEvent::KeyUp || initialKeyEvent.type() == PlatformEvent::Char)
return !element->dispatchKeyEvent(initialKeyEvent);
bool backwardCompatibilityMode = needsKeyboardEventDisambiguationQuirks();
PlatformKeyboardEvent keyDownEvent = initialKeyEvent;
if (keyDownEvent.type() != PlatformEvent::RawKeyDown)
keyDownEvent.disambiguateKeyDownEvent(PlatformEvent::RawKeyDown, backwardCompatibilityMode);
auto keydown = KeyboardEvent::create(keyDownEvent, &m_frame.windowProxy());
if (matchedAnAccessKey)
keydown->preventDefault();
keydown->setTarget(element);
if (initialKeyEvent.type() == PlatformEvent::RawKeyDown) {
element->dispatchEvent(keydown);
// If frame changed as a result of keydown dispatch, then return true to avoid sending a subsequent keypress message to the new frame.
bool changedFocusedFrame = m_frame.page() && &m_frame != &m_frame.page()->focusController().focusedOrMainFrame();
return keydown->defaultHandled() || keydown->defaultPrevented() || changedFocusedFrame;
}
// Run input method in advance of DOM event handling. This may result in the IM
// modifying the page prior the keydown event, but this behaviour is necessary
// in order to match IE:
// 1. preventing default handling of keydown and keypress events has no effect on IM input;
// 2. if an input method handles the event, its keyCode is set to 229 in keydown event.
m_frame.editor().handleInputMethodKeydown(keydown.get());
bool handledByInputMethod = keydown->defaultHandled();
if (handledByInputMethod) {
keyDownEvent.setWindowsVirtualKeyCode(CompositionEventKeyCode);
keydown = KeyboardEvent::create(keyDownEvent, &m_frame.windowProxy());
keydown->setTarget(element);
keydown->setIsDefaultEventHandlerIgnored();
}
if (accessibilityPreventsEventPropagation(keydown))
keydown->stopPropagation();
#if PLATFORM(IOS_FAMILY)
DeferDOMTimersForScope deferralScope { m_frame.document()->quirks().needsDeferKeyDownAndKeyPressTimersUntilNextEditingCommand() };
#endif
element->dispatchEvent(keydown);
if (handledByInputMethod)
return true;
// If frame changed as a result of keydown dispatch, then return early to avoid sending a subsequent keypress message to the new frame.
bool changedFocusedFrame = m_frame.page() && &m_frame != &m_frame.page()->focusController().focusedOrMainFrame();
bool keydownResult = keydown->defaultHandled() || keydown->defaultPrevented() || changedFocusedFrame;
if (keydownResult && !backwardCompatibilityMode)
return keydownResult;
// Focus may have changed during keydown handling, so refetch element.
// But if we are dispatching a fake backward compatibility keypress, then we pretend that the keypress happened on the original element.
if (!keydownResult) {
element = eventTargetElementForDocument(m_frame.document());
if (!element)
return false;
}
PlatformKeyboardEvent keyPressEvent = initialKeyEvent;
keyPressEvent.disambiguateKeyDownEvent(PlatformEvent::Char, backwardCompatibilityMode);
if (keyPressEvent.text().isEmpty())
return keydownResult;
auto keypress = KeyboardEvent::create(keyPressEvent, &m_frame.windowProxy());
keypress->setTarget(element);
if (keydownResult)
keypress->preventDefault();
#if PLATFORM(COCOA)
keypress->keypressCommands() = keydown->keypressCommands();
#endif
element->dispatchEvent(keypress);
return keydownResult || keypress->defaultPrevented() || keypress->defaultHandled();
}
static FocusDirection focusDirectionForKey(const AtomString& keyIdentifier)
{
static NeverDestroyed<AtomString> Down("Down", AtomString::ConstructFromLiteral);
static NeverDestroyed<AtomString> Up("Up", AtomString::ConstructFromLiteral);
static NeverDestroyed<AtomString> Left("Left", AtomString::ConstructFromLiteral);
static NeverDestroyed<AtomString> Right("Right", AtomString::ConstructFromLiteral);
FocusDirection retVal = FocusDirectionNone;
if (keyIdentifier == Down)
retVal = FocusDirectionDown;
else if (keyIdentifier == Up)
retVal = FocusDirectionUp;
else if (keyIdentifier == Left)
retVal = FocusDirectionLeft;
else if (keyIdentifier == Right)
retVal = FocusDirectionRight;
return retVal;
}
static void setInitialKeyboardSelection(Frame& frame, SelectionDirection direction)
{
Document* document = frame.document();
if (!document)
return;
FrameSelection& selection = frame.selection();
if (!selection.isNone())
return;
Element* focusedElement = document->focusedElement();
VisiblePosition visiblePosition;
switch (direction) {
case DirectionBackward:
case DirectionLeft:
if (focusedElement)
visiblePosition = VisiblePosition(positionBeforeNode(focusedElement));
else
visiblePosition = endOfDocument(document);
break;
case DirectionForward:
case DirectionRight:
if (focusedElement)
visiblePosition = VisiblePosition(positionAfterNode(focusedElement));
else
visiblePosition = startOfDocument(document);
break;
}
AXTextStateChangeIntent intent(AXTextStateChangeTypeSelectionMove, AXTextSelection { AXTextSelectionDirectionDiscontiguous, AXTextSelectionGranularityUnknown, false });
selection.setSelection(visiblePosition, FrameSelection::defaultSetSelectionOptions(UserTriggered), intent);
}
static void handleKeyboardSelectionMovement(Frame& frame, KeyboardEvent& event)
{
FrameSelection& selection = frame.selection();
bool isCommanded = event.getModifierState("Meta");
bool isOptioned = event.getModifierState("Alt");
bool isSelection = !selection.isNone();
FrameSelection::EAlteration alternation = event.getModifierState("Shift") ? FrameSelection::AlterationExtend : FrameSelection::AlterationMove;
SelectionDirection direction = DirectionForward;
TextGranularity granularity = CharacterGranularity;
switch (focusDirectionForKey(event.keyIdentifier())) {
case FocusDirectionNone:
return;
case FocusDirectionForward:
case FocusDirectionBackward:
ASSERT_NOT_REACHED();
return;
case FocusDirectionUp:
direction = DirectionBackward;
granularity = isCommanded ? DocumentBoundary : LineGranularity;
break;
case FocusDirectionDown:
direction = DirectionForward;
granularity = isCommanded ? DocumentBoundary : LineGranularity;
break;
case FocusDirectionLeft:
direction = DirectionLeft;
granularity = (isCommanded) ? LineBoundary : (isOptioned) ? WordGranularity : CharacterGranularity;
break;
case FocusDirectionRight:
direction = DirectionRight;
granularity = (isCommanded) ? LineBoundary : (isOptioned) ? WordGranularity : CharacterGranularity;
break;
}
if (isSelection)
selection.modify(alternation, direction, granularity, UserTriggered);
else
setInitialKeyboardSelection(frame, direction);
event.setDefaultHandled();
}
void EventHandler::handleKeyboardSelectionMovementForAccessibility(KeyboardEvent& event)
{
if (event.type() == eventNames().keydownEvent) {
if (AXObjectCache::accessibilityEnhancedUserInterfaceEnabled())
handleKeyboardSelectionMovement(m_frame, event);
}
}
bool EventHandler::accessibilityPreventsEventPropagation(KeyboardEvent& event)
{
#if PLATFORM(COCOA)
if (!AXObjectCache::accessibilityEnhancedUserInterfaceEnabled())
return false;
if (!m_frame.settings().preventKeyboardDOMEventDispatch())
return false;
// Check for key events that are relevant to accessibility: tab and arrows keys that change focus
if (event.keyIdentifier() == "U+0009")
return true;
FocusDirection direction = focusDirectionForKey(event.keyIdentifier());
if (direction != FocusDirectionNone)
return true;
#else
UNUSED_PARAM(event);
#endif
return false;
}
void EventHandler::defaultKeyboardEventHandler(KeyboardEvent& event)
{
Ref<Frame> protectedFrame(m_frame);
if (event.type() == eventNames().keydownEvent) {
m_frame.editor().handleKeyboardEvent(event);
if (event.defaultHandled())
return;
if (event.keyIdentifier() == "U+0009")
defaultTabEventHandler(event);
else if (event.keyIdentifier() == "U+0008")
defaultBackspaceEventHandler(event);
else {
FocusDirection direction = focusDirectionForKey(event.keyIdentifier());
if (direction != FocusDirectionNone)
defaultArrowEventHandler(direction, event);
}
handleKeyboardSelectionMovementForAccessibility(event);
}
if (event.type() == eventNames().keypressEvent) {
m_frame.editor().handleKeyboardEvent(event);
if (event.defaultHandled())
return;
if (event.charCode() == ' ')
defaultSpaceEventHandler(event);
}
}
#if ENABLE(DRAG_SUPPORT)
bool EventHandler::dragHysteresisExceeded(const IntPoint& floatDragViewportLocation) const
{
FloatPoint dragViewportLocation(floatDragViewportLocation.x(), floatDragViewportLocation.y());
return dragHysteresisExceeded(dragViewportLocation);
}
bool EventHandler::dragHysteresisExceeded(const FloatPoint& dragViewportLocation) const
{
int threshold = GeneralDragHysteresis;
switch (dragState().type) {
case DragSourceActionSelection:
threshold = TextDragHysteresis;
break;
case DragSourceActionImage:
#if ENABLE(ATTACHMENT_ELEMENT)
case DragSourceActionAttachment:
#endif
threshold = ImageDragHysteresis;
break;
case DragSourceActionLink:
threshold = LinkDragHysteresis;
break;
#if ENABLE(INPUT_TYPE_COLOR)
case DragSourceActionColor:
threshold = ColorDragHystersis;
break;
#endif
case DragSourceActionDHTML:
break;
case DragSourceActionNone:
case DragSourceActionAny:
ASSERT_NOT_REACHED();
}
return mouseMovementExceedsThreshold(dragViewportLocation, threshold);
}
void EventHandler::invalidateDataTransfer()
{
if (!dragState().dataTransfer)
return;
dragState().dataTransfer->makeInvalidForSecurity();
dragState().dataTransfer = nullptr;
}
static void removeDraggedContentDocumentMarkersFromAllFramesInPage(Page& page)
{
for (Frame* frame = &page.mainFrame(); frame; frame = frame->tree().traverseNext()) {
if (auto* document = frame->document())
document->markers().removeMarkers(DocumentMarker::DraggedContent);
}
if (auto* mainFrameRenderer = page.mainFrame().contentRenderer())
mainFrameRenderer->repaintRootContents();
}
void EventHandler::dragCancelled()
{
#if ENABLE(DATA_INTERACTION)
if (auto* page = m_frame.page())
removeDraggedContentDocumentMarkersFromAllFramesInPage(*page);
#endif
}
void EventHandler::didStartDrag()
{
#if ENABLE(DATA_INTERACTION)
auto dragSource = dragState().source;
if (!dragSource)
return;
auto* renderer = dragSource->renderer();
if (!renderer)
return;
RefPtr<Range> draggedContentRange;
if (dragState().type & DragSourceActionSelection)
draggedContentRange = m_frame.selection().selection().toNormalizedRange();
else {
Position startPosition(dragSource.get(), Position::PositionIsBeforeAnchor);
Position endPosition(dragSource.get(), Position::PositionIsAfterAnchor);
draggedContentRange = Range::create(dragSource->document(), startPosition, endPosition);
}
if (draggedContentRange) {
draggedContentRange->ownerDocument().markers().addDraggedContentMarker(*draggedContentRange);
if (auto* renderer = m_frame.contentRenderer())
renderer->repaintRootContents();
}
#endif
}
void EventHandler::dragSourceEndedAt(const PlatformMouseEvent& event, DragOperation operation, MayExtendDragSession mayExtendDragSession)
{
// Send a hit test request so that RenderLayer gets a chance to update the :hover and :active pseudoclasses.
HitTestRequest request(HitTestRequest::Release | HitTestRequest::DisallowUserAgentShadowContent);
prepareMouseEvent(request, event);
if (dragState().source && dragState().shouldDispatchEvents) {
dragState().dataTransfer->setDestinationOperation(operation);
dispatchDragSrcEvent(eventNames().dragendEvent, event);
}
invalidateDataTransfer();
if (mayExtendDragSession == MayExtendDragSession::No) {
if (auto* page = m_frame.page())
removeDraggedContentDocumentMarkersFromAllFramesInPage(*page);
}
dragState().source = nullptr;
// In case the drag was ended due to an escape key press we need to ensure
// that consecutive mousemove events don't reinitiate the drag and drop.
m_mouseDownMayStartDrag = false;
}
void EventHandler::updateDragStateAfterEditDragIfNeeded(Element& rootEditableElement)
{
// If inserting the dragged contents removed the drag source, we still want to fire dragend at the root editable element.
if (dragState().source && !dragState().source->isConnected())
dragState().source = &rootEditableElement;
}
void EventHandler::dispatchDragSrcEvent(const AtomString& eventType, const PlatformMouseEvent& event)
{
ASSERT(dragState().dataTransfer);
dispatchDragEvent(eventType, *dragState().source, event, *dragState().dataTransfer);
}
bool EventHandler::dispatchDragStartEventOnSourceElement(DataTransfer& dataTransfer)
{
return !dispatchDragEvent(eventNames().dragstartEvent, *dragState().source, m_mouseDown, dataTransfer) && !m_frame.selection().selection().isInPasswordField();
}
static bool ExactlyOneBitSet(DragSourceAction n)
{
return n && !(n & (n - 1));
}
RefPtr<Element> EventHandler::draggedElement() const
{
return dragState().source;
}
bool EventHandler::handleDrag(const MouseEventWithHitTestResults& event, CheckDragHysteresis checkDragHysteresis)
{
if (event.event().button() != LeftButton || event.event().type() != PlatformEvent::MouseMoved) {
// If we allowed the other side of the bridge to handle a drag
// last time, then m_mousePressed might still be set. So we
// clear it now to make sure the next move after a drag
// doesn't look like a drag.
m_mousePressed = false;
return false;
}
Ref<Frame> protectedFrame(m_frame);
if (eventLoopHandleMouseDragged(event))
return true;
// Careful that the drag starting logic stays in sync with eventMayStartDrag()
if (m_mouseDownMayStartDrag && !dragState().source) {
dragState().shouldDispatchEvents = (updateDragSourceActionsAllowed() & DragSourceActionDHTML);
// try to find an element that wants to be dragged
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::DisallowUserAgentShadowContent);
HitTestResult result(m_mouseDownPos);
m_frame.document()->hitTest(request, result);
if (m_frame.page())
dragState().source = m_frame.page()->dragController().draggableElement(&m_frame, result.targetElement(), m_mouseDownPos, dragState());
if (!dragState().source)
m_mouseDownMayStartDrag = false; // no element is draggable
else
m_dragMayStartSelectionInstead = (dragState().type & DragSourceActionSelection);
}
// For drags starting in the selection, the user must wait between the mousedown and mousedrag,
// or else we bail on the dragging stuff and allow selection to occur
if (m_mouseDownMayStartDrag && m_dragMayStartSelectionInstead && (dragState().type & DragSourceActionSelection) && event.event().timestamp() - m_mouseDownTimestamp < TextDragDelay) {
ASSERT(event.event().type() == PlatformEvent::MouseMoved);
if ((dragState().type & DragSourceActionImage)) {
// ... unless the mouse is over an image, then we start dragging just the image
dragState().type = DragSourceActionImage;
} else if (!(dragState().type & (DragSourceActionDHTML | DragSourceActionLink))) {
// ... but only bail if we're not over an unselectable element.
m_mouseDownMayStartDrag = false;
dragState().source = nullptr;
// ... but if this was the first click in the window, we don't even want to start selection
if (eventActivatedView(event.event()))
m_mouseDownMayStartSelect = false;
} else {
// Prevent the following case from occuring:
// 1. User starts a drag immediately after mouse down over an unselectable element.
// 2. We enter this block and decided that since we're over an unselectable element, don't cancel the drag.
// 3. The drag gets resolved as a potential selection drag below /but/ we haven't exceeded the drag hysteresis yet.
// 4. We enter this block again, and since it's now marked as a selection drag, we cancel the drag.
m_dragMayStartSelectionInstead = false;
}
}
if (!m_mouseDownMayStartDrag)
return !mouseDownMayStartSelect() && !m_mouseDownMayStartAutoscroll;
ASSERT(dragState().source);
if (!ExactlyOneBitSet(dragState().type)) {
ASSERT(dragState().type & DragSourceActionSelection);
ASSERT(ExactlyOneBitSet(static_cast<DragSourceAction>(dragState().type & ~DragSourceActionSelection)));
dragState().type = DragSourceActionSelection;
}
// We are starting a text/image/url drag, so the cursor should be an arrow
if (FrameView* view = m_frame.view()) {
// FIXME <rdar://7577595>: Custom cursors aren't supported during drag and drop (default to pointer).
view->setCursor(pointerCursor());
}
if (checkDragHysteresis == ShouldCheckDragHysteresis && !dragHysteresisExceeded(event.event().position()))
return true;
// Once we're past the hysteresis point, we don't want to treat this gesture as a click
invalidateClick();
DragOperation srcOp = DragOperationNone;
// This does work only if we missed a dragEnd. Do it anyway, just to make sure the old dataTransfer gets numbed.
invalidateDataTransfer();
dragState().dataTransfer = DataTransfer::createForDrag();
HasNonDefaultPasteboardData hasNonDefaultPasteboardData = HasNonDefaultPasteboardData::No;
if (dragState().shouldDispatchEvents) {
ASSERT(dragState().source);
auto dragStartDataTransfer = DataTransfer::createForDragStartEvent(dragState().source->document());
m_mouseDownMayStartDrag = dispatchDragStartEventOnSourceElement(dragStartDataTransfer);
hasNonDefaultPasteboardData = dragStartDataTransfer->pasteboard().hasData() ? HasNonDefaultPasteboardData::Yes : HasNonDefaultPasteboardData::No;
dragState().dataTransfer->moveDragState(WTFMove(dragStartDataTransfer));
if (dragState().source && dragState().type == DragSourceActionDHTML && !dragState().dataTransfer->hasDragImage()) {
dragState().source->document().updateStyleIfNeeded();
if (auto* renderer = dragState().source->renderer()) {
auto absolutePosition = renderer->localToAbsolute();
auto delta = m_mouseDownPos - roundedIntPoint(absolutePosition);
dragState().dataTransfer->setDragImage(dragState().source.get(), delta.width(), delta.height());
} else {
dispatchDragSrcEvent(eventNames().dragendEvent, event.event());
m_mouseDownMayStartDrag = false;
invalidateDataTransfer();
dragState().source = nullptr;
return true;
}
}
dragState().dataTransfer->makeInvalidForSecurity();
if (m_mouseDownMayStartDrag) {
// Gather values from DHTML element, if it set any.
srcOp = dragState().dataTransfer->sourceOperation();
// Yuck, a draggedImage:moveTo: message can be fired as a result of kicking off the
// drag with dragImage! Because of that dumb reentrancy, we may think we've not
// started the drag when that happens. So we have to assume it's started before we kick it off.
dragState().dataTransfer->setDragHasStarted();
}
}
if (m_mouseDownMayStartDrag) {
Page* page = m_frame.page();
m_didStartDrag = page && page->dragController().startDrag(m_frame, dragState(), srcOp, event.event(), m_mouseDownPos, hasNonDefaultPasteboardData);
// In WebKit2 we could re-enter this code and start another drag.
// On OS X this causes problems with the ownership of the pasteboard and the promised types.
if (m_didStartDrag) {
m_mouseDownMayStartDrag = false;
return true;
}
if (dragState().source && dragState().shouldDispatchEvents) {
// Drag was canned at the last minute. We owe dragSource a dragend event.
dispatchDragSrcEvent(eventNames().dragendEvent, event.event());
m_mouseDownMayStartDrag = false;
}
}
if (!m_mouseDownMayStartDrag) {
// Something failed to start the drag, clean up.
invalidateDataTransfer();
dragState().source = nullptr;
}
// No more default handling (like selection), whether we're past the hysteresis bounds or not
return true;
}
#endif // ENABLE(DRAG_SUPPORT)
bool EventHandler::mouseMovementExceedsThreshold(const FloatPoint& viewportLocation, int pointsThreshold) const
{
FrameView* view = m_frame.view();
if (!view)
return false;
IntPoint location = view->windowToContents(flooredIntPoint(viewportLocation));
IntSize delta = location - m_mouseDownPos;
return abs(delta.width()) >= pointsThreshold || abs(delta.height()) >= pointsThreshold;
}
bool EventHandler::handleTextInputEvent(const String& text, Event* underlyingEvent, TextEventInputType inputType)
{
LOG(Editing, "EventHandler %p handleTextInputEvent (text %s)", this, text.utf8().data());
// Platforms should differentiate real commands like selectAll from text input in disguise (like insertNewline),
// and avoid dispatching text input events from keydown default handlers.
ASSERT(!is<KeyboardEvent>(underlyingEvent) || downcast<KeyboardEvent>(*underlyingEvent).type() == eventNames().keypressEvent);
Ref<Frame> protectedFrame(m_frame);
EventTarget* target;
if (underlyingEvent)
target = underlyingEvent->target();
else
target = eventTargetElementForDocument(m_frame.document());
if (!target)
return false;
if (FrameView* view = m_frame.view())
view->disableLayerFlushThrottlingTemporarilyForInteraction();
auto event = TextEvent::create(&m_frame.windowProxy(), text, inputType);
event->setUnderlyingEvent(underlyingEvent);
target->dispatchEvent(event);
return event->defaultHandled();
}
bool EventHandler::isKeyboardOptionTab(KeyboardEvent& event)
{
return (event.type() == eventNames().keydownEvent || event.type() == eventNames().keypressEvent)
&& event.altKey()
&& event.keyIdentifier() == "U+0009";
}
bool EventHandler::eventInvertsTabsToLinksClientCallResult(KeyboardEvent& event)
{
#if PLATFORM(COCOA)
return isKeyboardOptionTab(event);
#else
UNUSED_PARAM(event);
return false;
#endif
}
bool EventHandler::tabsToLinks(KeyboardEvent* event) const
{
// FIXME: This function needs a better name. It can be called for keypresses other than Tab when spatial navigation is enabled.
Page* page = m_frame.page();
if (!page)
return false;
bool tabsToLinksClientCallResult = page->chrome().client().keyboardUIMode() & KeyboardAccessTabsToLinks;
return (event && eventInvertsTabsToLinksClientCallResult(*event)) ? !tabsToLinksClientCallResult : tabsToLinksClientCallResult;
}
void EventHandler::defaultTextInputEventHandler(TextEvent& event)
{
if (m_frame.editor().handleTextEvent(event))
event.setDefaultHandled();
}
void EventHandler::defaultSpaceEventHandler(KeyboardEvent& event)
{
Ref<Frame> protectedFrame(m_frame);
ASSERT(event.type() == eventNames().keypressEvent);
if (event.ctrlKey() || event.metaKey() || event.altKey() || event.altGraphKey())
return;
ScrollLogicalDirection direction = event.shiftKey() ? ScrollBlockDirectionBackward : ScrollBlockDirectionForward;
if (logicalScrollOverflow(direction, ScrollByPage)) {
event.setDefaultHandled();
return;
}
FrameView* view = m_frame.view();
if (!view)
return;
if (view->logicalScroll(direction, ScrollByPage))
event.setDefaultHandled();
}
void EventHandler::defaultBackspaceEventHandler(KeyboardEvent& event)
{
ASSERT(event.type() == eventNames().keydownEvent);
if (event.ctrlKey() || event.metaKey() || event.altKey() || event.altGraphKey())
return;
if (!m_frame.editor().behavior().shouldNavigateBackOnBackspace())
return;
Page* page = m_frame.page();
if (!page)
return;
if (!m_frame.settings().backspaceKeyNavigationEnabled())
return;
bool handledEvent = false;
if (event.shiftKey())
handledEvent = page->backForward().goForward();
else
handledEvent = page->backForward().goBack();
if (handledEvent)
event.setDefaultHandled();
}
void EventHandler::defaultArrowEventHandler(FocusDirection focusDirection, KeyboardEvent& event)
{
ASSERT(event.type() == eventNames().keydownEvent);
if (event.ctrlKey() || event.metaKey() || event.altGraphKey() || event.shiftKey())
return;
Page* page = m_frame.page();
if (!page)
return;
if (!isSpatialNavigationEnabled(&m_frame))
return;
// Arrows and other possible directional navigation keys can be used in design
// mode editing.
if (m_frame.document()->inDesignMode())
return;
if (page->focusController().advanceFocus(focusDirection, &event))
event.setDefaultHandled();
}
void EventHandler::defaultTabEventHandler(KeyboardEvent& event)
{
Ref<Frame> protectedFrame(m_frame);
ASSERT(event.type() == eventNames().keydownEvent);
// We should only advance focus on tabs if no special modifier keys are held down.
if (event.ctrlKey() || event.metaKey() || event.altGraphKey())
return;
Page* page = m_frame.page();
if (!page)
return;
if (!page->tabKeyCyclesThroughElements())
return;
FocusDirection focusDirection = event.shiftKey() ? FocusDirectionBackward : FocusDirectionForward;
// Tabs can be used in design mode editing.
if (m_frame.document()->inDesignMode())
return;
if (page->focusController().advanceFocus(focusDirection, &event))
event.setDefaultHandled();
}
void EventHandler::sendScrollEvent()
{
Ref<Frame> protectedFrame(m_frame);
setFrameWasScrolledByUser();
if (m_frame.view() && m_frame.document())
m_frame.document()->eventQueue().enqueueOrDispatchScrollEvent(*m_frame.document());
}
void EventHandler::setFrameWasScrolledByUser()
{
FrameView* v = m_frame.view();
if (v)
v->setWasScrolledByUser(true);
}
bool EventHandler::passMousePressEventToScrollbar(MouseEventWithHitTestResults& mouseEvent, Scrollbar* scrollbar)
{
if (!scrollbar || !scrollbar->enabled())
return false;
setFrameWasScrolledByUser();
return scrollbar->mouseDown(mouseEvent.event());
}
// If scrollbar (under mouse) is different from last, send a mouse exited.
void EventHandler::updateLastScrollbarUnderMouse(Scrollbar* scrollbar, SetOrClearLastScrollbar setOrClear)
{
if (m_lastScrollbarUnderMouse != scrollbar) {
// Send mouse exited to the old scrollbar.
if (m_lastScrollbarUnderMouse)
m_lastScrollbarUnderMouse->mouseExited();
// Send mouse entered if we're setting a new scrollbar.
if (scrollbar && setOrClear == SetOrClearLastScrollbar::Set) {
scrollbar->mouseEntered();
m_lastScrollbarUnderMouse = makeWeakPtr(*scrollbar);
} else
m_lastScrollbarUnderMouse = nullptr;
}
}
#if ENABLE(TOUCH_EVENTS) && !ENABLE(IOS_TOUCH_EVENTS)
static const AtomString& eventNameForTouchPointState(PlatformTouchPoint::State state)
{
switch (state) {
case PlatformTouchPoint::TouchReleased:
return eventNames().touchendEvent;
case PlatformTouchPoint::TouchCancelled:
return eventNames().touchcancelEvent;
case PlatformTouchPoint::TouchPressed:
return eventNames().touchstartEvent;
case PlatformTouchPoint::TouchMoved:
return eventNames().touchmoveEvent;
case PlatformTouchPoint::TouchStationary:
// TouchStationary state is not converted to touch events, so fall through to assert.
default:
ASSERT_NOT_REACHED();
return emptyAtom();
}
}
static HitTestResult hitTestResultInFrame(Frame* frame, const LayoutPoint& point, HitTestRequest::HitTestRequestType hitType)
{
HitTestResult result(point);
if (!frame || !frame->contentRenderer())
return result;
if (frame->view()) {
IntRect rect = frame->view()->visibleContentRect();
if (!rect.contains(roundedIntPoint(point)))
return result;
}
frame->document()->hitTest(HitTestRequest(hitType), result);
return result;
}
bool EventHandler::handleTouchEvent(const PlatformTouchEvent& event)
{
Ref<Frame> protectedFrame(m_frame);
// First build up the lists to use for the 'touches', 'targetTouches' and 'changedTouches' attributes
// in the JS event. See http://www.sitepen.com/blog/2008/07/10/touching-and-gesturing-on-the-iphone/
// for an overview of how these lists fit together.
// Holds the complete set of touches on the screen and will be used as the 'touches' list in the JS event.
RefPtr<TouchList> touches = TouchList::create();
// A different view on the 'touches' list above, filtered and grouped by event target. Used for the
// 'targetTouches' list in the JS event.
typedef HashMap<EventTarget*, RefPtr<TouchList>> TargetTouchesMap;
TargetTouchesMap touchesByTarget;
// Array of touches per state, used to assemble the 'changedTouches' list in the JS event.
typedef HashSet<RefPtr<EventTarget>> EventTargetSet;
struct {
// The touches corresponding to the particular change state this struct instance represents.
RefPtr<TouchList> m_touches;
// Set of targets involved in m_touches.
EventTargetSet m_targets;
} changedTouches[PlatformTouchPoint::TouchStateEnd];
const Vector<PlatformTouchPoint>& points = event.touchPoints();
UserGestureIndicator gestureIndicator(ProcessingUserGesture, m_frame.document());
bool freshTouchEvents = true;
bool allTouchReleased = true;
for (auto& point : points) {
if (point.state() != PlatformTouchPoint::TouchPressed)
freshTouchEvents = false;
if (point.state() != PlatformTouchPoint::TouchReleased && point.state() != PlatformTouchPoint::TouchCancelled)
allTouchReleased = false;
}
for (auto& point : points) {
PlatformTouchPoint::State pointState = point.state();
LayoutPoint pagePoint = documentPointForWindowPoint(m_frame, point.pos());
HitTestRequest::HitTestRequestType hitType = HitTestRequest::TouchEvent;
// The HitTestRequest types used for mouse events map quite adequately
// to touch events. Note that in addition to meaning that the hit test
// should affect the active state of the current node if necessary,
// HitTestRequest::Active signifies that the hit test is taking place
// with the mouse (or finger in this case) being pressed.
switch (pointState) {
case PlatformTouchPoint::TouchPressed:
hitType |= HitTestRequest::Active;
break;
case PlatformTouchPoint::TouchMoved:
hitType |= HitTestRequest::Active | HitTestRequest::Move | HitTestRequest::ReadOnly;
break;
case PlatformTouchPoint::TouchReleased:
case PlatformTouchPoint::TouchCancelled:
hitType |= HitTestRequest::Release;
break;
case PlatformTouchPoint::TouchStationary:
hitType |= HitTestRequest::Active | HitTestRequest::ReadOnly;
break;
default:
ASSERT_NOT_REACHED();
break;
}
if (shouldGesturesTriggerActive())
hitType |= HitTestRequest::ReadOnly;
// Increment the platform touch id by 1 to avoid storing a key of 0 in the hashmap.
unsigned touchPointTargetKey = point.id() + 1;
RefPtr<EventTarget> touchTarget;
if (pointState == PlatformTouchPoint::TouchPressed) {
HitTestResult result;
if (freshTouchEvents) {
result = hitTestResultAtPoint(pagePoint, hitType | HitTestRequest::AllowChildFrameContent);
m_originatingTouchPointTargetKey = touchPointTargetKey;
} else if (m_originatingTouchPointDocument.get() && m_originatingTouchPointDocument->frame()) {
LayoutPoint pagePointInOriginatingDocument = documentPointForWindowPoint(*m_originatingTouchPointDocument->frame(), point.pos());
result = hitTestResultInFrame(m_originatingTouchPointDocument->frame(), pagePointInOriginatingDocument, hitType);
if (!result.innerNode())
continue;
} else
continue;
Element* element = result.targetElement();
ASSERT(element);
if (element && InspectorInstrumentation::handleTouchEvent(m_frame, *element))
return true;
Document& doc = element->document();
// Record the originating touch document even if it does not have a touch listener.
if (freshTouchEvents) {
m_originatingTouchPointDocument = &doc;
freshTouchEvents = false;
}
if (!doc.hasTouchEventHandlers())
continue;
m_originatingTouchPointTargets.set(touchPointTargetKey, element);
touchTarget = element;
} else if (pointState == PlatformTouchPoint::TouchReleased || pointState == PlatformTouchPoint::TouchCancelled) {
// No need to perform a hit-test since we only need to unset :hover and :active states.
if (!shouldGesturesTriggerActive() && allTouchReleased)
m_frame.document()->updateHoverActiveState(hitType, 0);
if (touchPointTargetKey == m_originatingTouchPointTargetKey)
m_originatingTouchPointTargetKey = 0;
// The target should be the original target for this touch, so get it from the hashmap. As it's a release or cancel
// we also remove it from the map.
touchTarget = m_originatingTouchPointTargets.take(touchPointTargetKey);
} else
// No hittest is performed on move or stationary, since the target is not allowed to change anyway.
touchTarget = m_originatingTouchPointTargets.get(touchPointTargetKey);
if (!is<Node>(touchTarget))
continue;
auto& document = downcast<Node>(*touchTarget).document();
if (!document.hasTouchEventHandlers())
continue;
auto* targetFrame = document.frame();
if (!targetFrame)
continue;
if (&m_frame != targetFrame) {
// pagePoint should always be relative to the target elements containing frame.
pagePoint = documentPointForWindowPoint(*targetFrame, point.pos());
}
float scaleFactor = targetFrame->pageZoomFactor() * targetFrame->frameScaleFactor();
int adjustedPageX = lroundf(pagePoint.x() / scaleFactor);
int adjustedPageY = lroundf(pagePoint.y() / scaleFactor);
auto touch = Touch::create(targetFrame, touchTarget.get(), point.id(),
point.screenPos().x(), point.screenPos().y(), adjustedPageX, adjustedPageY,
point.radiusX(), point.radiusY(), point.rotationAngle(), point.force());
// Ensure this target's touch list exists, even if it ends up empty, so it can always be passed to TouchEvent::Create below.
TargetTouchesMap::iterator targetTouchesIterator = touchesByTarget.find(touchTarget.get());
if (targetTouchesIterator == touchesByTarget.end())
targetTouchesIterator = touchesByTarget.set(touchTarget.get(), TouchList::create()).iterator;
// touches and targetTouches should only contain information about touches still on the screen, so if this point is
// released or cancelled it will only appear in the changedTouches list.
if (pointState != PlatformTouchPoint::TouchReleased && pointState != PlatformTouchPoint::TouchCancelled) {
touches->append(touch.copyRef());
targetTouchesIterator->value->append(touch.copyRef());
}
// Now build up the correct list for changedTouches.
// Note that any touches that are in the TouchStationary state (e.g. if
// the user had several points touched but did not move them all) should
// never be in the changedTouches list so we do not handle them explicitly here.
// See https://bugs.webkit.org/show_bug.cgi?id=37609 for further discussion
// about the TouchStationary state.
if (pointState != PlatformTouchPoint::TouchStationary) {
ASSERT(pointState < PlatformTouchPoint::TouchStateEnd);
if (!changedTouches[pointState].m_touches)
changedTouches[pointState].m_touches = TouchList::create();
changedTouches[pointState].m_touches->append(WTFMove(touch));
changedTouches[pointState].m_targets.add(touchTarget);
}
}
m_touchPressed = touches->length() > 0;
if (allTouchReleased)
m_originatingTouchPointDocument = nullptr;
// Now iterate the changedTouches list and m_targets within it, sending events to the targets as required.
bool swallowedEvent = false;
RefPtr<TouchList> emptyList = TouchList::create();
for (unsigned state = 0; state != PlatformTouchPoint::TouchStateEnd; ++state) {
if (!changedTouches[state].m_touches)
continue;
// When sending a touch cancel event, use empty touches and targetTouches lists.
bool isTouchCancelEvent = (state == PlatformTouchPoint::TouchCancelled);
RefPtr<TouchList>& effectiveTouches(isTouchCancelEvent ? emptyList : touches);
const AtomString& stateName(eventNameForTouchPointState(static_cast<PlatformTouchPoint::State>(state)));
for (auto& target : changedTouches[state].m_targets) {
ASSERT(is<Node>(target));
RefPtr<TouchList> targetTouches(isTouchCancelEvent ? emptyList : touchesByTarget.get(target.get()));
ASSERT(targetTouches);
Ref<TouchEvent> touchEvent = TouchEvent::create(effectiveTouches.get(), targetTouches.get(), changedTouches[state].m_touches.get(),
stateName, downcast<Node>(*target).document().windowProxy(), { }, event.modifiers());
target->dispatchEvent(touchEvent);
swallowedEvent = swallowedEvent || touchEvent->defaultPrevented() || touchEvent->defaultHandled();
}
}
return swallowedEvent;
}
#endif // ENABLE(TOUCH_EVENTS) && !ENABLE(IOS_TOUCH_EVENTS)
#if ENABLE(TOUCH_EVENTS)
bool EventHandler::dispatchSyntheticTouchEventIfEnabled(const PlatformMouseEvent& platformMouseEvent)
{
#if ENABLE(IOS_TOUCH_EVENTS)
UNUSED_PARAM(platformMouseEvent);
return false;
#else
if (!m_frame.settings().isTouchEventEmulationEnabled())
return false;
PlatformEvent::Type eventType = platformMouseEvent.type();
if (eventType != PlatformEvent::MouseMoved && eventType != PlatformEvent::MousePressed && eventType != PlatformEvent::MouseReleased)
return false;
HitTestRequest request(HitTestRequest::Active | HitTestRequest::DisallowUserAgentShadowContent);
MouseEventWithHitTestResults mouseEvent = prepareMouseEvent(request, platformMouseEvent);
if (mouseEvent.scrollbar() || subframeForHitTestResult(mouseEvent))
return false;
// The order is important. This check should follow the subframe test: http://webkit.org/b/111292.
if (eventType == PlatformEvent::MouseMoved && !m_touchPressed)
return true;
SyntheticSingleTouchEvent touchEvent(platformMouseEvent);
return handleTouchEvent(touchEvent);
#endif
}
#endif // ENABLE(TOUCH_EVENTS)
void EventHandler::setLastKnownMousePosition(const PlatformMouseEvent& event)
{
m_mousePositionIsUnknown = false;
m_lastKnownMousePosition = event.position();
m_lastKnownMouseGlobalPosition = event.globalPosition();
}
void EventHandler::setImmediateActionStage(ImmediateActionStage stage)
{
m_immediateActionStage = stage;
}
#if !PLATFORM(COCOA)
OptionSet<PlatformEvent::Modifier> EventHandler::accessKeyModifiers()
{
return PlatformEvent::Modifier::AltKey;
}
bool EventHandler::passMousePressEventToSubframe(MouseEventWithHitTestResults& mev, Frame* subframe)
{
subframe->eventHandler().handleMousePressEvent(mev.event());
return true;
}
bool EventHandler::passMouseReleaseEventToSubframe(MouseEventWithHitTestResults& mev, Frame* subframe)
{
subframe->eventHandler().handleMouseReleaseEvent(mev.event());
return true;
}
bool EventHandler::widgetDidHandleWheelEvent(const PlatformWheelEvent& event, Widget& widget)
{
if (!is<FrameView>(widget))
return false;
return downcast<FrameView>(widget).frame().eventHandler().handleWheelEvent(event);
}
bool EventHandler::tabsToAllFormControls(KeyboardEvent*) const
{
// We always allow tabs to all controls
return true;
}
bool EventHandler::passWidgetMouseDownEventToWidget(RenderWidget* renderWidget)
{
return passMouseDownEventToWidget(renderWidget->widget());
}
bool EventHandler::passWidgetMouseDownEventToWidget(const MouseEventWithHitTestResults& event)
{
// Figure out which view to send the event to.
RenderObject* target = event.targetNode() ? event.targetNode()->renderer() : nullptr;
if (!is<RenderWidget>(target))
return false;
return passMouseDownEventToWidget(downcast<RenderWidget>(*target).widget());
}
bool EventHandler::passMouseDownEventToWidget(Widget*)
{
notImplemented();
return false;
}
void EventHandler::focusDocumentView()
{
if (Page* page = m_frame.page())
page->focusController().setFocusedFrame(&m_frame);
}
#endif // !PLATFORM(COCOA)
#if !PLATFORM(COCOA) && !PLATFORM(WIN)
bool EventHandler::eventActivatedView(const PlatformMouseEvent&) const
{
notImplemented();
return false;
}
bool EventHandler::passMouseMoveEventToSubframe(MouseEventWithHitTestResults& mev, Frame* subframe, HitTestResult* hoveredNode)
{
subframe->eventHandler().handleMouseMoveEvent(mev.event(), hoveredNode);
return true;
}
#endif // !PLATFORM(COCOA) && !PLATFORM(WIN)
} // namespace WebCore