Google Git
Sign in
webkit / WebKit / a847461eedf68a16e2d2491447608ea3bf9d7890 / . / Source / WebCore / page / EventHandler.cpp
blob: cd0bf5346966be9c15e0dd23d7f664b230957692 [file] [log] [blame]
/*
* Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2013 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 COMPUTER, 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 COMPUTER, 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 "AXObjectCache.h"
#include "AutoscrollController.h"
#include "CachedImage.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "Cursor.h"
#include "CursorList.h"
#include "Document.h"
#include "DocumentEventQueue.h"
#include "DragController.h"
#include "DragState.h"
#include "Editor.h"
#include "EditorClient.h"
#include "EventNames.h"
#include "ExceptionCodePlaceholder.h"
#include "FileList.h"
#include "FloatPoint.h"
#include "FloatRect.h"
#include "FocusController.h"
#include "FrameLoader.h"
#include "FrameSelection.h"
#include "FrameTree.h"
#include "FrameView.h"
#include "htmlediting.h"
#include "HTMLFrameElementBase.h"
#include "HTMLFrameSetElement.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "HitTestRequest.h"
#include "HitTestResult.h"
#include "Image.h"
#include "InspectorInstrumentation.h"
#include "KeyboardEvent.h"
#include "MainFrame.h"
#include "MouseEvent.h"
#include "MouseEventWithHitTestResults.h"
#include "Page.h"
#include "PlatformEvent.h"
#include "PlatformKeyboardEvent.h"
#include "PlatformWheelEvent.h"
#include "PluginDocument.h"
#include "RenderFrameSet.h"
#include "RenderLayer.h"
#include "RenderTextControlSingleLine.h"
#include "RenderView.h"
#include "RenderWidget.h"
#include "RuntimeApplicationChecks.h"
#include "ScrollAnimator.h"
#include "Scrollbar.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "SpatialNavigation.h"
#include "StyleCachedImage.h"
#include "TextEvent.h"
#include "TextIterator.h"
#include "UserGestureIndicator.h"
#include "UserTypingGestureIndicator.h"
#include "WheelEvent.h"
#include "WindowsKeyboardCodes.h"
#include <wtf/Assertions.h>
#include <wtf/CurrentTime.h>
#include <wtf/StdLibExtras.h>
#include <wtf/TemporaryChange.h>
#if ENABLE(TOUCH_ADJUSTMENT)
#include "TouchAdjustment.h"
#endif
#if ENABLE(SVG)
#include "SVGDocument.h"
#include "SVGElementInstance.h"
#include "SVGNames.h"
#include "SVGUseElement.h"
#endif
#if ENABLE(TOUCH_EVENTS)
#include "PlatformTouchEvent.h"
#include "TouchEvent.h"
#include "TouchList.h"
#endif
#if ENABLE(CSS_IMAGE_SET)
#include "StyleCachedImageSet.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 GeneralDragHysteresis = 3;
#endif // ENABLE(DRAG_SUPPORT)
// Match key code of composition keydown event on windows.
// IE sends VK_PROCESSKEY which has value 229;
const int CompositionEventKeyCode = 229;
#if ENABLE(SVG)
using namespace SVGNames;
#endif
// 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 double fakeMouseMoveShortInterval = 0.1;
const double fakeMouseMoveLongInterval = 0.25;
#if !PLATFORM(IOS)
// 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
const double cursorUpdateInterval = 0.02;
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
enum NoCursorChangeType { NoCursorChange };
class OptionalCursor {
public:
OptionalCursor(NoCursorChangeType) : m_isCursorChange(false) { }
OptionalCursor(const Cursor& cursor) : m_isCursorChange(true), m_cursor(cursor) { }
bool isCursorChange() const { return m_isCursorChange; }
const Cursor& cursor() const { ASSERT(m_isCursorChange); return m_cursor; }
private:
bool m_isCursorChange;
Cursor m_cursor;
};
class MaximumDurationTracker {
public:
explicit MaximumDurationTracker(double *maxDuration)
: m_maxDuration(maxDuration)
, m_start(monotonicallyIncreasingTime())
{
}
~MaximumDurationTracker()
{
*m_maxDuration = std::max(*m_maxDuration, monotonicallyIncreasingTime() - m_start);
}
private:
double* m_maxDuration;
double m_start;
};
#if ENABLE(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
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 scrollNode(float delta, ScrollGranularity granularity, ScrollDirection positiveDirection, ScrollDirection negativeDirection, Node* node, Element** stopElement)
{
if (!delta)
return false;
if (!node->renderer())
return false;
RenderBox* enclosingBox = node->renderer()->enclosingBox();
float absDelta = delta > 0 ? delta : -delta;
return enclosingBox->scroll(delta < 0 ? negativeDirection : positiveDirection, granularity, absDelta, stopElement);
}
#if (ENABLE(TOUCH_EVENTS) && !PLATFORM(IOS))
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(MAC)
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_mousePressed(false)
, m_capturesDragging(false)
, m_mouseDownMayStartSelect(false)
#if ENABLE(DRAG_SUPPORT)
, m_mouseDownMayStartDrag(false)
, m_dragMayStartSelectionInstead(false)
#endif
, m_mouseDownWasSingleClickInSelection(false)
, m_selectionInitiationState(HaveNotStartedSelection)
, m_hoverTimer(this, &EventHandler::hoverTimerFired)
, m_cursorUpdateTimer(this, &EventHandler::cursorUpdateTimerFired)
, m_autoscrollController(adoptPtr(new AutoscrollController))
, m_mouseDownMayStartAutoscroll(false)
, m_mouseDownWasInSubframe(false)
, m_fakeMouseMoveEventTimer(this, &EventHandler::fakeMouseMoveEventTimerFired)
#if ENABLE(SVG)
, m_svgPan(false)
#endif
, m_resizeLayer(0)
, m_eventHandlerWillResetCapturingMouseEventsElement(nullptr)
, m_clickCount(0)
, m_mousePositionIsUnknown(true)
, m_mouseDownTimestamp(0)
, m_inTrackingScrollGesturePhase(false)
, m_widgetIsLatched(false)
#if PLATFORM(MAC)
, m_mouseDownView(nil)
, m_sendingEventToSubview(false)
, m_activationEventNumber(-1)
#endif
#if ENABLE(TOUCH_EVENTS)
, m_originatingTouchPointTargetKey(0)
, m_touchPressed(false)
#endif
, m_maxMouseMovedDuration(0)
, m_baseEventType(PlatformEvent::NoType)
, m_didStartDrag(false)
, m_didLongPressInvokeContextMenu(false)
, m_isHandlingWheelEvent(false)
#if ENABLE(CURSOR_VISIBILITY)
, m_autoHideCursorTimer(this, &EventHandler::autoHideCursorTimerFired)
#endif
{
}
EventHandler::~EventHandler()
{
ASSERT(!m_fakeMouseMoveEventTimer.isActive());
#if ENABLE(CURSOR_VISIBILITY)
ASSERT(!m_autoHideCursorTimer.isActive());
#endif
}
#if ENABLE(DRAG_SUPPORT)
DragState& EventHandler::dragState()
{
DEFINE_STATIC_LOCAL(DragState, state, ());
return state;
}
#endif // ENABLE(DRAG_SUPPORT)
void EventHandler::clear()
{
m_hoverTimer.stop();
m_cursorUpdateTimer.stop();
m_fakeMouseMoveEventTimer.stop();
#if ENABLE(CURSOR_VISIBILITY)
cancelAutoHideCursorTimer();
#endif
m_resizeLayer = 0;
m_elementUnderMouse = nullptr;
m_lastElementUnderMouse = nullptr;
#if ENABLE(SVG)
m_instanceUnderMouse = 0;
m_lastInstanceUnderMouse = 0;
#endif
m_lastMouseMoveEventSubframe = 0;
m_lastScrollbarUnderMouse = 0;
m_clickCount = 0;
m_clickNode = 0;
m_frameSetBeingResized = 0;
#if ENABLE(DRAG_SUPPORT)
m_dragTarget = 0;
m_shouldOnlyFireDragOverEvent = false;
#endif
m_mousePositionIsUnknown = true;
m_lastKnownMousePosition = IntPoint();
m_lastKnownMouseGlobalPosition = IntPoint();
m_mousePressNode = 0;
m_mousePressed = false;
m_capturesDragging = false;
m_capturingMouseEventsElement = nullptr;
m_latchedWheelEventElement = nullptr;
m_previousWheelScrolledElement = nullptr;
#if ENABLE(TOUCH_EVENTS)
m_originatingTouchPointTargets.clear();
m_originatingTouchPointDocument.clear();
m_originatingTouchPointTargetKey = 0;
#endif
m_maxMouseMovedDuration = 0;
m_baseEventType = PlatformEvent::NoType;
m_didStartDrag = false;
m_didLongPressInvokeContextMenu = false;
}
void EventHandler::nodeWillBeRemoved(Node* nodeToBeRemoved)
{
if (nodeToBeRemoved->contains(m_clickNode.get()))
m_clickNode = 0;
}
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;
return node->dispatchEvent(Event::create(eventNames().selectstartEvent, true, true));
}
static VisibleSelection expandSelectionToRespectUserSelectAll(Node* targetNode, const VisibleSelection& selection)
{
#if ENABLE(USERSELECT_ALL)
Node* rootUserSelectAll = Position::rootUserSelectAllForNode(targetNode);
if (!rootUserSelectAll)
return selection;
VisibleSelection newSelection(selection);
newSelection.setBase(positionBeforeNode(rootUserSelectAll).upstream(CanCrossEditingBoundary));
newSelection.setExtent(positionAfterNode(rootUserSelectAll).downstream(CanCrossEditingBoundary));
return newSelection;
#else
UNUSED_PARAM(targetNode);
return selection;
#endif
}
bool EventHandler::updateSelectionForMouseDownDispatchingSelectStart(Node* targetNode, const VisibleSelection& selection, TextGranularity granularity)
{
if (Position::nodeIsUserSelectNone(targetNode))
return false;
if (!dispatchSelectStart(targetNode))
return false;
if (selection.isRange())
m_selectionInitiationState = ExtendedSelection;
else {
granularity = CharacterGranularity;
m_selectionInitiationState = PlacedCaret;
}
m_frame.selection().setNonDirectionalSelectionIfNeeded(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()));
if (pos.isNotNull()) {
newSelection = VisibleSelection(pos);
newSelection.expandUsingGranularity(WordGranularity);
}
if (appendTrailingWhitespace == ShouldAppendTrailingWhitespace && newSelection.isRange())
newSelection.appendTrailingWhitespace();
updateSelectionForMouseDownDispatchingSelectStart(targetNode, expandSelectionToRespectUserSelectAll(targetNode, newSelection), WordGranularity);
}
}
void EventHandler::selectClosestWordFromMouseEvent(const MouseEventWithHitTestResults& result)
{
if (m_mouseDownMayStartSelect) {
selectClosestWordFromHitTestResult(result.hitTestResult(),
(result.event().clickCount() == 2 && m_frame.editor().isSelectTrailingWhitespaceEnabled()) ? ShouldAppendTrailingWhitespace : DontAppendTrailingWhitespace);
}
}
void EventHandler::selectClosestWordOrLinkFromMouseEvent(const MouseEventWithHitTestResults& result)
{
if (!result.hitTestResult().isLiveLink())
return selectClosestWordFromMouseEvent(result);
Node* targetNode = result.targetNode();
if (targetNode && targetNode->renderer() && m_mouseDownMayStartSelect) {
VisibleSelection newSelection;
Element* URLElement = result.hitTestResult().URLElement();
VisiblePosition pos(targetNode->renderer()->positionForPoint(result.localPoint()));
if (pos.isNotNull() && pos.deepEquivalent().deprecatedNode()->isDescendantOf(URLElement))
newSelection = VisibleSelection::selectionFromContentsOfNode(URLElement);
updateSelectionForMouseDownDispatchingSelectStart(targetNode, expandSelectionToRespectUserSelectAll(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()));
if (pos.isNotNull()) {
newSelection = VisibleSelection(pos);
newSelection.expandUsingGranularity(ParagraphGranularity);
}
return updateSelectionForMouseDownDispatchingSelectStart(targetNode, expandSelectionToRespectUserSelectAll(targetNode, newSelection), ParagraphGranularity);
}
static int textDistance(const Position& start, const Position& end)
{
RefPtr<Range> range = Range::create(start.anchorNode()->document(), start, end);
return TextIterator::rangeLength(range.get(), true);
}
bool EventHandler::handleMousePressEventSingleClick(const MouseEventWithHitTestResults& event)
{
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()));
if (visiblePos.isNull())
visiblePos = VisiblePosition(firstPositionInOrBeforeNode(targetNode), DOWNSTREAM);
Position pos = visiblePos.deepEquivalent();
VisibleSelection newSelection = m_frame.selection().selection();
TextGranularity granularity = CharacterGranularity;
if (extendSelection && newSelection.isCaretOrRange()) {
VisibleSelection selectionInUserSelectAll = expandSelectionToRespectUserSelectAll(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 = expandSelectionToRespectUserSelectAll(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)
{
#if ENABLE(DRAG_SUPPORT)
// Reset drag state.
dragState().source = 0;
#endif
cancelFakeMouseMoveEvent();
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()
m_mouseDownMayStartDrag = singleClick;
#endif
m_mouseDownWasSingleClickInSelection = false;
m_mouseDown = event.event();
if (event.isOverWidget() && passWidgetMouseDownEventToWidget(event))
return true;
#if ENABLE(SVG)
if (m_frame.document()->isSVGDocument()
&& toSVGDocument(m_frame.document())->zoomAndPanEnabled()) {
if (event.event().shiftKey() && singleClick) {
m_svgPan = true;
toSVGDocument(m_frame.document())->startPan(m_frame.view()->windowToContents(event.event().position()));
return true;
}
}
#endif
// 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();
#if ENABLE(DRAG_SUPPORT)
m_dragStartPos = event.event().position();
#endif
bool swallowEvent = false;
m_mousePressed = true;
m_selectionInitiationState = HaveNotStartedSelection;
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;
}
#if ENABLE(DRAG_SUPPORT)
bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& event)
{
if (!m_mousePressed)
return false;
if (handleDrag(event, ShouldCheckDragHysteresis))
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(MAC) // 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) {
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::DisallowShadowContent);
HitTestResult result(m_mouseDownPos);
m_frame.document()->renderView()->hitTest(request, 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
if (!m_frame.contentRenderer() || !m_frame.contentRenderer()->hasLayer())
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;
updateDragSourceActionsAllowed();
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::DisallowShadowContent);
HitTestResult result(view->windowToContents(event.position()));
m_frame.contentRenderer()->hitTest(request, result);
DragState state;
return result.innerElement() && page->dragController().draggableElement(&m_frame, result.innerElement(), result.roundedPointInInnerNodeFrame(), state);
}
void EventHandler::updateSelectionForMouseDrag()
{
FrameView* view = m_frame.view();
if (!view)
return;
RenderView* renderer = m_frame.contentRenderer();
if (!renderer)
return;
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::Move | HitTestRequest::DisallowShadowContent);
HitTestResult result(view->windowToContents(m_lastKnownMousePosition));
renderer->hitTest(request, result);
updateSelectionForMouseDrag(result);
}
static VisiblePosition selectionExtentRespectingEditingBoundary(const VisibleSelection& selection, const LayoutPoint& localPoint, Node* targetNode)
{
LayoutPoint selectionEndPoint = localPoint;
Element* editableElement = selection.rootEditableElement();
if (!targetNode->renderer())
return VisiblePosition();
if (editableElement && !editableElement->contains(targetNode)) {
if (!editableElement->renderer())
return VisiblePosition();
FloatPoint absolutePoint = targetNode->renderer()->localToAbsolute(FloatPoint(selectionEndPoint));
selectionEndPoint = roundedLayoutPoint(editableElement->renderer()->absoluteToLocal(absolutePoint));
targetNode = editableElement;
}
return targetNode->renderer()->positionForPoint(selectionEndPoint);
}
void EventHandler::updateSelectionForMouseDrag(const HitTestResult& hitTestResult)
{
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();
#if ENABLE(SVG)
// 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;
#endif
if (m_selectionInitiationState == HaveNotStartedSelection && !dispatchSelectStart(target))
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()), m_mousePressNode->renderer()->positionForPoint(m_dragStartPos)) < 0)
newSelection.setBase(positionAfterNode(rootUserSelectAllForMousePressNode).downstream(CanCrossEditingBoundary));
Node* rootUserSelectAllForTarget = Position::rootUserSelectAllForNode(target);
if (rootUserSelectAllForTarget && m_mousePressNode->renderer() && comparePositions(target->renderer()->positionForPoint(hitTestResult.localPoint()), m_mousePressNode->renderer()->positionForPoint(m_dragStartPos)) < 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().setNonDirectionalSelectionIfNeeded(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();
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_dragStartPos == event.event().position()
#endif
&& m_frame.selection().isRange()
&& event.event().button() != RightButton) {
VisibleSelection newSelection;
Node* node = event.targetNode();
bool caretBrowsing = m_frame.settings().caretBrowsingEnabled();
if (node && node->renderer() && (caretBrowsing || node->rendererIsEditable())) {
VisiblePosition pos = node->renderer()->positionForPoint(event.localPoint());
newSelection = VisibleSelection(pos);
}
setSelectionIfNeeded(m_frame.selection(), newSelection);
handled = true;
}
m_frame.selection().notifyRendererOfSelectionChange(UserTriggered);
m_frame.selection().selectFrameElementInParentIfFullySelected();
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 (!renderer->isBox())
return;
m_autoscrollController->startPanScrolling(toRenderBox(renderer), lastKnownMousePosition());
invalidateClick();
}
#endif // ENABLE(PAN_SCROLLING)
RenderElement* 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)
{
// 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);
}
}
HitTestResult result(point, padding.height(), padding.width(), padding.height(), padding.width());
if (!m_frame.contentRenderer())
return result;
// hitTestResultAtPoint is specifically used to hitTest into all frames, thus it always allows child frame content.
HitTestRequest request(hitType | HitTestRequest::AllowChildFrameContent);
m_frame.contentRenderer()->hitTest(request, result);
if (!request.readOnly())
m_frame.document()->updateHoverActiveState(request, result.innerElement());
if (request.disallowsShadowContent())
result.setToNonShadowAncestor();
return result;
}
void EventHandler::stopAutoscrollTimer(bool rendererIsBeingDestroyed)
{
m_autoscrollController->stopAutoscrollTimer(rendererIsBeingDestroyed);
}
Node* EventHandler::mousePressNode() const
{
return m_mousePressNode.get();
}
void EventHandler::setMousePressNode(PassRefPtr<Node> node)
{
m_mousePressNode = node;
}
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)
{
// 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)
{
// 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(MAC)
// 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 0;
auto renderer = node->renderer();
if (!renderer || !renderer->isWidget())
return 0;
Widget* widget = toRenderWidget(renderer)->widget();
if (!widget || !widget->isFrameView())
return 0;
return &toFrameView(widget)->frame();
}
static bool isSubmitImage(Node* node)
{
return node && isHTMLInputElement(node) && toHTMLInputElement(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().rootEditableElement() != node.rootEditableElement();
}
bool EventHandler::useHandCursor(Node* node, bool isOverLink, bool shiftKey)
{
if (!node)
return false;
bool editable = node->rendererIsEditable();
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(Timer<EventHandler>*)
{
ASSERT(m_frame.document());
updateCursor();
}
void EventHandler::updateCursor()
{
if (m_mousePositionIsUnknown)
return;
FrameView* view = m_frame.view();
if (!view)
return;
RenderView* renderView = view->renderView();
if (!renderView)
return;
if (!view->shouldSetCursor())
return;
bool shiftKey;
bool ctrlKey;
bool altKey;
bool metaKey;
PlatformKeyboardEvent::getCurrentModifierState(shiftKey, ctrlKey, altKey, metaKey);
m_frame.document()->updateLayout();
HitTestRequest request(HitTestRequest::ReadOnly);
HitTestResult result(view->windowToContents(m_lastKnownMousePosition));
renderView->hitTest(request, result);
OptionalCursor optionalCursor = selectCursor(result, shiftKey);
if (optionalCursor.isCursorChange()) {
m_currentMouseCursor = optionalCursor.cursor();
view->setCursor(m_currentMouseCursor);
}
}
OptionalCursor EventHandler::selectCursor(const HitTestResult& result, bool shiftKey)
{
if (m_resizeLayer && m_resizeLayer->inResizeMode())
return NoCursorChange;
if (!m_frame.page())
return NoCursorChange;
#if ENABLE(PAN_SCROLLING)
if (m_frame.mainFrame().eventHandler().panScrollInProgress())
return NoCursorChange;
#endif
Node* node = result.targetNode();
if (!node)
return NoCursorChange;
auto renderer = node->renderer();
RenderStyle* style = renderer ? &renderer->style() : nullptr;
bool horizontalText = !style || style->isHorizontalWritingMode();
const Cursor& iBeam = horizontalText ? iBeamCursor() : verticalTextCursor();
#if ENABLE(CURSOR_VISIBILITY)
if (style && style->cursorVisibility() == CursorVisibilityAutoHide) {
FeatureObserver::observe(m_frame.document(), FeatureObserver::CursorVisibility);
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 NoCursorChange;
}
}
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();
hotSpot.scale(scale, scale);
IntSize 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)
}
}
switch (style ? style->cursor() : CURSOR_AUTO) {
case CURSOR_AUTO: {
bool editable = node->rendererIsEditable();
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())));
}
}
// During selection, use an I-beam regardless of the content beneath the cursor when cursor style is not explicitly specified.
// 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;
}
if ((editable || (renderer && renderer->isText() && node->canStartSelection())) && !inResizer && !result.scrollbar())
return iBeam;
return pointerCursor();
}
case CURSOR_CROSS:
return crossCursor();
case CURSOR_POINTER:
return handCursor();
case CURSOR_MOVE:
return moveCursor();
case CURSOR_ALL_SCROLL:
return moveCursor();
case CURSOR_E_RESIZE:
return eastResizeCursor();
case CURSOR_W_RESIZE:
return westResizeCursor();
case CURSOR_N_RESIZE:
return northResizeCursor();
case CURSOR_S_RESIZE:
return southResizeCursor();
case CURSOR_NE_RESIZE:
return northEastResizeCursor();
case CURSOR_SW_RESIZE:
return southWestResizeCursor();
case CURSOR_NW_RESIZE:
return northWestResizeCursor();
case CURSOR_SE_RESIZE:
return southEastResizeCursor();
case CURSOR_NS_RESIZE:
return northSouthResizeCursor();
case CURSOR_EW_RESIZE:
return eastWestResizeCursor();
case CURSOR_NESW_RESIZE:
return northEastSouthWestResizeCursor();
case CURSOR_NWSE_RESIZE:
return northWestSouthEastResizeCursor();
case CURSOR_COL_RESIZE:
return columnResizeCursor();
case CURSOR_ROW_RESIZE:
return rowResizeCursor();
case CURSOR_TEXT:
return iBeamCursor();
case CURSOR_WAIT:
return waitCursor();
case CURSOR_HELP:
return helpCursor();
case CURSOR_VERTICAL_TEXT:
return verticalTextCursor();
case CURSOR_CELL:
return cellCursor();
case CURSOR_CONTEXT_MENU:
return contextMenuCursor();
case CURSOR_PROGRESS:
return progressCursor();
case CURSOR_NO_DROP:
return noDropCursor();
case CURSOR_ALIAS:
return aliasCursor();
case CURSOR_COPY:
return copyCursor();
case CURSOR_NONE:
return noneCursor();
case CURSOR_NOT_ALLOWED:
return notAllowedCursor();
case CURSOR_DEFAULT:
return pointerCursor();
case CURSOR_WEBKIT_ZOOM_IN:
return zoomInCursor();
case CURSOR_WEBKIT_ZOOM_OUT:
return zoomOutCursor();
case CURSOR_WEBKIT_GRAB:
return grabCursor();
case CURSOR_WEBKIT_GRABBING:
return grabbingCursor();
}
return pointerCursor();
}
#if ENABLE(CURSOR_VISIBILITY)
void EventHandler::startAutoHideCursorTimer()
{
Page* page = m_frame.page();
if (!page)
return;
m_autoHideCursorTimer.startOneShot(page->settings().timeWithoutMouseMovementBeforeHidingControls());
// 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();
}
void EventHandler::cancelAutoHideCursorTimer()
{
if (m_autoHideCursorTimer.isActive())
m_autoHideCursorTimer.stop();
}
void EventHandler::autoHideCursorTimerFired(Timer<EventHandler>* timer)
{
ASSERT_UNUSED(timer, timer == &m_autoHideCursorTimer);
m_currentMouseCursor = noneCursor();
FrameView* view = m_frame.view();
if (view && view->isActive())
view->setCursor(m_currentMouseCursor);
}
#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;
}
bool EventHandler::handleMousePressEvent(const PlatformMouseEvent& mouseEvent)
{
RefPtr<FrameView> protector(m_frame.view());
if (InspectorInstrumentation::handleMousePress(m_frame.page())) {
invalidateClick();
return true;
}
#if ENABLE(TOUCH_EVENTS)
bool defaultPrevented = dispatchSyntheticTouchEventIfEnabled(mouseEvent);
if (defaultPrevented)
return true;
#endif
UserGestureIndicator gestureIndicator(DefinitelyProcessingUserGesture);
// FIXME (bug 68185): this call should be made at another abstraction layer
m_frame.loader().resetMultipleFormSubmissionProtection();
cancelFakeMouseMoveEvent();
m_mousePressed = true;
m_capturesDragging = true;
setLastKnownMousePosition(mouseEvent);
m_mouseDownTimestamp = mouseEvent.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(mouseEvent.position());
else {
invalidateClick();
return false;
}
m_mouseDownWasInSubframe = false;
HitTestRequest request(HitTestRequest::Active | HitTestRequest::DisallowShadowContent);
// 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, mouseEvent.position());
MouseEventWithHitTestResults mev = m_frame.document()->prepareMouseEvent(request, documentPoint, mouseEvent);
if (!mev.targetNode()) {
invalidateClick();
return false;
}
m_mousePressNode = mev.targetNode();
RefPtr<Frame> subframe = subframeForHitTestResult(mev);
if (subframe && passMousePressEventToSubframe(mev, 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 = mouseEvent.clickCount();
m_clickNode = mev.targetNode();
if (FrameView* view = m_frame.view()) {
RenderLayer* layer = m_clickNode->renderer() ? m_clickNode->renderer()->enclosingLayer() : 0;
IntPoint p = view->windowToContents(mouseEvent.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, mev.targetNode(), true, m_clickCount, mouseEvent, true);
m_capturesDragging = !swallowEvent || mev.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 (mev.scrollbar()) {
const bool wasLastScrollBar = mev.scrollbar() == m_lastScrollbarUnderMouse.get();
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::DisallowShadowContent);
mev = m_frame.document()->prepareMouseEvent(request, documentPoint, mouseEvent);
if (wasLastScrollBar && mev.scrollbar() != m_lastScrollbarUnderMouse.get())
m_lastScrollbarUnderMouse = 0;
}
if (swallowEvent) {
// scrollbars should get events anyway, even disabled controls might be scrollable
Scrollbar* scrollbar = mev.scrollbar();
updateLastScrollbarUnderMouse(scrollbar, true);
if (scrollbar)
passMousePressEventToScrollbar(mev, scrollbar);
} else {
// 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 (mev.targetNode()->isShadowRoot() && isHTMLInputElement(toShadowRoot(mev.targetNode())->hostElement())) {
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::DisallowShadowContent);
mev = m_frame.document()->prepareMouseEvent(request, documentPoint, mouseEvent);
}
FrameView* view = m_frame.view();
Scrollbar* scrollbar = view ? view->scrollbarAtPoint(mouseEvent.position()) : 0;
if (!scrollbar)
scrollbar = mev.scrollbar();
updateLastScrollbarUnderMouse(scrollbar, true);
if (scrollbar && passMousePressEventToScrollbar(mev, scrollbar))
swallowEvent = true;
else
swallowEvent = handleMousePressEvent(mev);
}
return swallowEvent;
}
// This method only exists for platforms that don't know how to deliver
bool EventHandler::handleMouseDoubleClickEvent(const PlatformMouseEvent& mouseEvent)
{
RefPtr<FrameView> protector(m_frame.view());
m_frame.selection().setCaretBlinkingSuspended(false);
UserGestureIndicator gestureIndicator(DefinitelyProcessingUserGesture);
// We get this instead of a second mouse-up
m_mousePressed = false;
setLastKnownMousePosition(mouseEvent);
HitTestRequest request(HitTestRequest::Active | HitTestRequest::DisallowShadowContent);
MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseEvent);
Frame* subframe = subframeForHitTestResult(mev);
if (m_eventHandlerWillResetCapturingMouseEventsElement)
m_capturingMouseEventsElement = nullptr;
if (subframe && passMousePressEventToSubframe(mev, subframe))
return true;
m_clickCount = mouseEvent.clickCount();
bool swallowMouseUpEvent = !dispatchMouseEvent(eventNames().mouseupEvent, mev.targetNode(), true, m_clickCount, mouseEvent, false);
bool swallowClickEvent = mouseEvent.button() != RightButton && mev.targetNode() == m_clickNode && !dispatchMouseEvent(eventNames().clickEvent, mev.targetNode(), true, m_clickCount, mouseEvent, true);
if (m_lastScrollbarUnderMouse)
swallowMouseUpEvent = m_lastScrollbarUnderMouse->mouseUp(mouseEvent);
bool swallowMouseReleaseEvent = !swallowMouseUpEvent && handleMouseReleaseEvent(mev);
invalidateClick();
return swallowMouseUpEvent || swallowClickEvent || swallowMouseReleaseEvent;
}
static RenderLayer* layerForNode(Node* node)
{
if (!node)
return 0;
auto renderer = node->renderer();
if (!renderer)
return 0;
RenderLayer* layer = renderer->enclosingLayer();
if (!layer)
return 0;
return layer;
}
bool EventHandler::mouseMoved(const PlatformMouseEvent& event)
{
RefPtr<FrameView> protector(m_frame.view());
MaximumDurationTracker maxDurationTracker(&m_maxMouseMovedDuration);
HitTestResult hoveredNode = HitTestResult(LayoutPoint());
bool result = handleMouseMoveEvent(event, &hoveredNode);
Page* page = m_frame.page();
if (!page)
return result;
if (RenderLayer* layer = layerForNode(hoveredNode.innerNode())) {
if (FrameView* frameView = m_frame.view()) {
if (frameView->containsScrollableArea(layer))
layer->mouseMovedInContentArea();
}
}
if (FrameView* frameView = m_frame.view())
frameView->mouseMovedInContentArea();
hoveredNode.setToNonShadowAncestor();
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& mouseEvent, HitTestResult* hoveredNode, bool onlyUpdateScrollbars)
{
#if ENABLE(TOUCH_EVENTS)
bool defaultPrevented = dispatchSyntheticTouchEventIfEnabled(mouseEvent);
if (defaultPrevented)
return true;
#endif
RefPtr<FrameView> protector(m_frame.view());
setLastKnownMousePosition(mouseEvent);
if (m_hoverTimer.isActive())
m_hoverTimer.stop();
m_cursorUpdateTimer.stop();
cancelFakeMouseMoveEvent();
#if ENABLE(SVG)
if (m_svgPan) {
toSVGDocument(m_frame.document())->updatePan(m_frame.view()->windowToContents(m_lastKnownMousePosition));
return true;
}
#endif
if (m_frameSetBeingResized)
return !dispatchMouseEvent(eventNames().mousemoveEvent, m_frameSetBeingResized.get(), false, 0, mouseEvent, false);
// Send events right to a scrollbar if the mouse is pressed.
if (m_lastScrollbarUnderMouse && m_mousePressed)
return m_lastScrollbarUnderMouse->mouseMoved(mouseEvent);
HitTestRequest::HitTestRequestType hitType = HitTestRequest::Move | HitTestRequest::DisallowShadowContent | 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)
// 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 mev = prepareMouseEvent(request, mouseEvent);
if (hoveredNode)
*hoveredNode = mev.hitTestResult();
if (m_resizeLayer && m_resizeLayer->inResizeMode())
m_resizeLayer->resize(mouseEvent, m_offsetFromResizeCorner);
else {
Scrollbar* scrollbar = mev.scrollbar();
updateLastScrollbarUnderMouse(scrollbar, !m_mousePressed);
if (!m_mousePressed && scrollbar)
scrollbar->mouseMoved(mouseEvent); // Handle hover effects on platforms that support visual feedback on scrollbar hovering.
if (onlyUpdateScrollbars)
return true;
}
bool swallowEvent = false;
RefPtr<Frame> newSubframe = m_capturingMouseEventsElement.get() ? subframeForTargetNode(m_capturingMouseEventsElement.get()) : subframeForHitTestResult(mev);
// 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(mev, m_lastMouseMoveEventSubframe.get());
if (newSubframe) {
// Update over/out state before passing the event to the subframe.
updateMouseEventTargetNode(mev.targetNode(), mouseEvent, true);
// 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(mev, newSubframe.get(), hoveredNode);
} else {
if (FrameView* view = m_frame.view()) {
OptionalCursor optionalCursor = selectCursor(mev.hitTestResult(), mouseEvent.shiftKey());
if (optionalCursor.isCursorChange()) {
m_currentMouseCursor = optionalCursor.cursor();
view->setCursor(m_currentMouseCursor);
}
}
}
m_lastMouseMoveEventSubframe = newSubframe;
if (swallowEvent)
return true;
swallowEvent = !dispatchMouseEvent(eventNames().mousemoveEvent, mev.targetNode(), false, 0, mouseEvent, true);
#if ENABLE(DRAG_SUPPORT)
if (!swallowEvent)
swallowEvent = handleMouseDraggedEvent(mev);
#endif // ENABLE(DRAG_SUPPORT)
return swallowEvent;
}
void EventHandler::invalidateClick()
{
m_clickCount = 0;
m_clickNode = 0;
}
inline static bool mouseIsReleasedOnPressedElement(Node* targetNode, Node* clickNode)
{
if (targetNode == clickNode)
return true;
if (!targetNode)
return false;
ShadowRoot* containingShadowRoot = targetNode->containingShadowRoot();
if (!containingShadowRoot)
return false;
// FIXME: When an element in UA ShadowDOM (e.g. inner element in <input>) is clicked,
// we assume that the host element is clicked. This is necessary for implementing <input type="range"> etc.
// However, we should not check ShadowRoot type basically.
// https://bugs.webkit.org/show_bug.cgi?id=108047
if (containingShadowRoot->type() != ShadowRoot::UserAgentShadowRoot)
return false;
Node* adjustedTargetNode = targetNode->shadowHost();
Node* adjustedClickNode = clickNode ? clickNode->shadowHost() : 0;
return adjustedTargetNode == adjustedClickNode;
}
bool EventHandler::handleMouseReleaseEvent(const PlatformMouseEvent& mouseEvent)
{
RefPtr<FrameView> protector(m_frame.view());
m_frame.selection().setCaretBlinkingSuspended(false);
#if ENABLE(TOUCH_EVENTS)
bool defaultPrevented = dispatchSyntheticTouchEventIfEnabled(mouseEvent);
if (defaultPrevented)
return true;
#endif
UserGestureIndicator gestureIndicator(DefinitelyProcessingUserGesture);
#if ENABLE(PAN_SCROLLING)
m_autoscrollController->handleMouseReleaseEvent(mouseEvent);
#endif
m_mousePressed = false;
setLastKnownMousePosition(mouseEvent);
#if ENABLE(SVG)
if (m_svgPan) {
m_svgPan = false;
toSVGDocument(m_frame.document())->updatePan(m_frame.view()->windowToContents(m_lastKnownMousePosition));
return true;
}
#endif
if (m_frameSetBeingResized)
return !dispatchMouseEvent(eventNames().mouseupEvent, m_frameSetBeingResized.get(), true, m_clickCount, mouseEvent, false);
if (m_lastScrollbarUnderMouse) {
invalidateClick();
m_lastScrollbarUnderMouse->mouseUp(mouseEvent);
bool cancelable = true;
bool setUnder = false;
return !dispatchMouseEvent(eventNames().mouseupEvent, m_lastElementUnderMouse.get(), cancelable, m_clickCount, mouseEvent, setUnder);
}
HitTestRequest request(HitTestRequest::Release | HitTestRequest::DisallowShadowContent);
MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseEvent);
Frame* subframe = m_capturingMouseEventsElement.get() ? subframeForTargetNode(m_capturingMouseEventsElement.get()) : subframeForHitTestResult(mev);
if (m_eventHandlerWillResetCapturingMouseEventsElement)
m_capturingMouseEventsElement = nullptr;
if (subframe && passMouseReleaseEventToSubframe(mev, subframe))
return true;
bool swallowMouseUpEvent = !dispatchMouseEvent(eventNames().mouseupEvent, mev.targetNode(), true, m_clickCount, mouseEvent, false);
bool contextMenuEvent = mouseEvent.button() == RightButton;
bool swallowClickEvent = m_clickCount > 0 && !contextMenuEvent && mouseIsReleasedOnPressedElement(mev.targetNode(), m_clickNode.get()) && !dispatchMouseEvent(eventNames().clickEvent, mev.targetNode(), true, m_clickCount, mouseEvent, true);
if (m_resizeLayer) {
m_resizeLayer->setInResizeMode(false);
m_resizeLayer = 0;
}
bool swallowMouseReleaseEvent = false;
if (!swallowMouseUpEvent)
swallowMouseReleaseEvent = handleMouseReleaseEvent(mev);
invalidateClick();
return swallowMouseUpEvent || swallowClickEvent || swallowMouseReleaseEvent;
}
bool EventHandler::handlePasteGlobalSelection(const PlatformMouseEvent& mouseEvent)
{
// 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 (mouseEvent.type() != PlatformEvent::MousePressed)
return false;
#else
if (mouseEvent.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(ASCIILiteral("PasteGlobalSelection")).execute();
return false;
}
#if ENABLE(DRAG_SUPPORT)
bool EventHandler::dispatchDragEvent(const AtomicString& eventType, Element& dragTarget, const PlatformMouseEvent& event, Clipboard* clipboard)
{
FrameView* view = m_frame.view();
// FIXME: We might want to dispatch a dragleave even if the view is gone.
if (!view)
return false;
view->resetDeferredRepaintDelay();
RefPtr<MouseEvent> me = MouseEvent::create(eventType,
true, true, event.timestamp(), m_frame.document()->defaultView(),
0, event.globalPosition().x(), event.globalPosition().y(), event.position().x(), event.position().y(),
#if ENABLE(POINTER_LOCK)
event.movementDelta().x(), event.movementDelta().y(),
#endif
event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(),
0, 0, clipboard);
dragTarget.dispatchEvent(me.get(), IGNORE_EXCEPTION);
return me->defaultPrevented();
}
static bool targetIsFrame(Node* target, Frame*& frame)
{
if (!target)
return false;
if (!target->hasTagName(frameTag) && !target->hasTagName(iframeTag))
return false;
frame = toHTMLFrameElementBase(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 ASCIILiteral("copy");
case DragOperationMove:
return ASCIILiteral("move");
case DragOperationLink:
return ASCIILiteral("link");
default:
return ASCIILiteral("copy");
}
}
static inline bool hasFileOfType(Clipboard& clipboard, const String& type)
{
RefPtr<FileList> fileList = clipboard.files();
for (unsigned i = 0; i < fileList->length(); i++) {
if (equalIgnoringCase(fileList->item(i)->type(), type))
return true;
}
return false;
}
static inline bool hasStringOfType(Clipboard& clipboard, const String& type)
{
return !type.isNull() && clipboard.types().contains(type);
}
static bool hasDropZoneType(Clipboard& clipboard, const String& keyword)
{
if (keyword.startsWith("file:"))
return hasFileOfType(clipboard, keyword.substring(5));
if (keyword.startsWith("string:"))
return hasStringOfType(clipboard, keyword.substring(7));
return false;
}
static bool findDropZone(Node* target, Clipboard* clipboard)
{
Element* element = target->isElementNode() ? toElement(target) : target->parentElement();
for (; element; element = element->parentElement()) {
bool matched = false;
String dropZoneStr = element->fastGetAttribute(webkitdropzoneAttr);
if (dropZoneStr.isEmpty())
continue;
dropZoneStr = dropZoneStr.lower();
SpaceSplitString keywords(dropZoneStr, false);
if (keywords.isEmpty())
continue;
DragOperation dragOperation = DragOperationNone;
for (unsigned int i = 0; i < keywords.size(); i++) {
DragOperation op = convertDropZoneOperationToDragOperation(keywords[i]);
if (op != DragOperationNone) {
if (dragOperation == DragOperationNone)
dragOperation = op;
} else
matched = matched || hasDropZoneType(*clipboard, keywords[i].string());
if (matched && dragOperation != DragOperationNone)
break;
}
if (matched) {
clipboard->setDropEffect(convertDragOperationToDropZoneOperation(dragOperation));
return true;
}
}
return false;
}
bool EventHandler::updateDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard)
{
bool accept = false;
if (!m_frame.view())
return false;
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::DisallowShadowContent);
MouseEventWithHitTestResults mev = prepareMouseEvent(request, event);
RefPtr<Element> newTarget;
if (Node* targetNode = mev.targetNode()) {
// Drag events should never go to non-element nodes (following IE, and proper mouseover/out dispatch)
if (!targetNode->isElementNode())
newTarget = targetNode->parentOrShadowHostElement();
else
newTarget = toElement(targetNode);
}
m_autoscrollController->updateDragAndDrop(newTarget.get(), event.position(), event.timestamp());
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)
accept = targetFrame->eventHandler().updateDragAndDrop(event, clipboard);
} 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) {
// for now we don't care if event handler cancels default behavior, since there is none
dispatchDragSrcEvent(eventNames().dragEvent, event);
}
accept = dispatchDragEvent(eventNames().dragenterEvent, *newTarget, event, clipboard);
if (!accept)
accept = findDropZone(newTarget.get(), clipboard);
}
if (targetIsFrame(m_dragTarget.get(), targetFrame)) {
if (targetFrame)
accept = targetFrame->eventHandler().updateDragAndDrop(event, clipboard);
} else if (m_dragTarget)
dispatchDragEvent(eventNames().dragleaveEvent, *m_dragTarget, event, clipboard);
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)
accept = targetFrame->eventHandler().updateDragAndDrop(event, clipboard);
} 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) {
// for now we don't care if event handler cancels default behavior, since there is none
dispatchDragSrcEvent(eventNames().dragEvent, event);
}
accept = dispatchDragEvent(eventNames().dragoverEvent, *newTarget, event, clipboard);
if (!accept)
accept = findDropZone(newTarget.get(), clipboard);
m_shouldOnlyFireDragOverEvent = false;
}
}
m_dragTarget = newTarget.release();
return accept;
}
void EventHandler::cancelDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard)
{
Frame* targetFrame;
if (targetIsFrame(m_dragTarget.get(), targetFrame)) {
if (targetFrame)
targetFrame->eventHandler().cancelDragAndDrop(event, clipboard);
} else if (m_dragTarget) {
if (dragState().source && dragState().shouldDispatchEvents)
dispatchDragSrcEvent(eventNames().dragEvent, event);
dispatchDragEvent(eventNames().dragleaveEvent, *m_dragTarget, event, clipboard);
}
clearDragState();
}
bool EventHandler::performDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard)
{
Frame* targetFrame;
bool preventedDefault = false;
if (targetIsFrame(m_dragTarget.get(), targetFrame)) {
if (targetFrame)
preventedDefault = targetFrame->eventHandler().performDragAndDrop(event, clipboard);
} else if (m_dragTarget)
preventedDefault = dispatchDragEvent(eventNames().dropEvent, *m_dragTarget, event, clipboard);
clearDragState();
return preventedDefault;
}
void EventHandler::clearDragState()
{
stopAutoscrollTimer();
m_dragTarget = nullptr;
m_capturingMouseEventsElement = nullptr;
m_shouldOnlyFireDragOverEvent = false;
#if PLATFORM(MAC)
m_sendingEventToSubview = false;
#endif
}
#endif // ENABLE(DRAG_SUPPORT)
void EventHandler::setCapturingMouseEventsElement(PassRefPtr<Element> element)
{
m_capturingMouseEventsElement = element;
m_eventHandlerWillResetCapturingMouseEventsElement = false;
}
MouseEventWithHitTestResults EventHandler::prepareMouseEvent(const HitTestRequest& request, const PlatformMouseEvent& mev)
{
ASSERT(m_frame.document());
return m_frame.document()->prepareMouseEvent(request, documentPointForWindowPoint(m_frame, mev.position()), mev);
}
#if ENABLE(SVG)
static inline SVGElementInstance* instanceAssociatedWithShadowTreeElement(Node* referenceNode)
{
if (!referenceNode || !referenceNode->isSVGElement())
return 0;
ShadowRoot* shadowRoot = referenceNode->containingShadowRoot();
if (!shadowRoot)
return 0;
Element* shadowTreeParentElement = shadowRoot->hostElement();
if (!shadowTreeParentElement || !shadowTreeParentElement->hasTagName(useTag))
return 0;
return toSVGUseElement(shadowTreeParentElement)->instanceForShadowTreeElement(referenceNode);
}
#endif
void EventHandler::updateMouseEventTargetNode(Node* targetNode, const PlatformMouseEvent& mouseEvent, bool fireMouseOverOut)
{
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>
if (!targetNode->isElementNode())
targetElement = targetNode->parentOrShadowHostElement();
else
targetElement = toElement(targetNode);
}
m_elementUnderMouse = targetElement;
#if ENABLE(SVG)
m_instanceUnderMouse = instanceAssociatedWithShadowTreeElement(targetElement);
// <use> shadow tree elements may have been recloned, update node under mouse in any case
if (m_lastInstanceUnderMouse) {
SVGElement* lastCorrespondingElement = m_lastInstanceUnderMouse->correspondingElement();
SVGElement* lastCorrespondingUseElement = m_lastInstanceUnderMouse->correspondingUseElement();
if (lastCorrespondingElement && lastCorrespondingUseElement) {
HashSet<SVGElementInstance*> instances = lastCorrespondingElement->instancesForElement();
// Locate the recloned shadow tree element for our corresponding instance
HashSet<SVGElementInstance*>::iterator end = instances.end();
for (HashSet<SVGElementInstance*>::iterator it = instances.begin(); it != end; ++it) {
SVGElementInstance* instance = (*it);
ASSERT(instance->correspondingElement() == lastCorrespondingElement);
if (instance == m_lastInstanceUnderMouse)
continue;
if (instance->correspondingUseElement() != lastCorrespondingUseElement)
continue;
SVGElement* shadowTreeElement = instance->shadowTreeElement();
if (!shadowTreeElement->inDocument() || m_lastElementUnderMouse == shadowTreeElement)
continue;
m_lastElementUnderMouse = shadowTreeElement;
m_lastInstanceUnderMouse = instance;
break;
}
}
}
#endif
// Fire mouseout/mouseover if the mouse has shifted to a different node.
if (fireMouseOverOut) {
RenderLayer* layerForLastNode = layerForNode(m_lastElementUnderMouse.get());
RenderLayer* layerForNodeUnderMouse = layerForNode(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 && (layerForLastNode && (!layerForNodeUnderMouse || layerForNodeUnderMouse != layerForLastNode))) {
// The mouse has moved between layers.
if (Frame* frame = m_lastElementUnderMouse->document().frame()) {
if (FrameView* frameView = frame->view()) {
if (frameView->containsScrollableArea(layerForLastNode))
layerForLastNode->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 && (layerForNodeUnderMouse && (!layerForLastNode || layerForNodeUnderMouse != layerForLastNode))) {
// The mouse has moved between layers.
if (Frame* frame = m_elementUnderMouse->document().frame()) {
if (FrameView* frameView = frame->view()) {
if (frameView->containsScrollableArea(layerForNodeUnderMouse))
layerForNodeUnderMouse->mouseEnteredContentArea();
}
}
}
if (m_lastElementUnderMouse && &m_lastElementUnderMouse->document() != m_frame.document()) {
m_lastElementUnderMouse = nullptr;
m_lastScrollbarUnderMouse = 0;
#if ENABLE(SVG)
m_lastInstanceUnderMouse = 0;
#endif
}
if (m_lastElementUnderMouse != m_elementUnderMouse) {
// send mouseout event to the old node
if (m_lastElementUnderMouse)
m_lastElementUnderMouse->dispatchMouseEvent(mouseEvent, eventNames().mouseoutEvent, 0, m_elementUnderMouse.get());
// send mouseover event to the new node
if (m_elementUnderMouse)
m_elementUnderMouse->dispatchMouseEvent(mouseEvent, eventNames().mouseoverEvent, 0, m_lastElementUnderMouse.get());
}
m_lastElementUnderMouse = m_elementUnderMouse;
#if ENABLE(SVG)
m_lastInstanceUnderMouse = instanceAssociatedWithShadowTreeElement(m_elementUnderMouse.get());
#endif
}
}
bool EventHandler::dispatchMouseEvent(const AtomicString& eventType, Node* targetNode, bool /*cancelable*/, int clickCount, const PlatformMouseEvent& mouseEvent, bool setUnder)
{
if (FrameView* view = m_frame.view())
view->resetDeferredRepaintDelay();
updateMouseEventTargetNode(targetNode, mouseEvent, setUnder);
bool swallowEvent = false;
if (m_elementUnderMouse)
swallowEvent = !(m_elementUnderMouse->dispatchMouseEvent(mouseEvent, eventType, clickCount));
if (!swallowEvent && eventType == eventNames().mousedownEvent) {
// If clicking on a frame scrollbar, do not mess up with content focus.
if (FrameView* view = m_frame.view()) {
if (view->scrollbarAtPoint(mouseEvent.position()))
return true;
}
// The layout needs to be up to date to determine if an element is focusable.
m_frame.document()->updateLayoutIgnorePendingStylesheets();
// Blur current focus node when a link/button is clicked; this
// is expected by some sites that rely on onChange handlers running
// from form fields before the button click is processed.
Element* element = m_elementUnderMouse.get();
// Walk up the DOM tree to search for an element to focus.
while (element) {
if (element->isMouseFocusable()) {
// To fix <rdar://problem/4895428> Can't drag selected ToDo, we don't focus a
// node on mouse down if it's selected and inside a focused node. It will be
// focused if the user does a mouseup over it, however, because the mouseup
// will set a selection inside it, which will call setFocuseNodeIfNeeded.
if (m_frame.selection().isRange()
&& m_frame.selection().toNormalizedRange()->compareNode(element, IGNORE_EXCEPTION) == Range::NODE_INSIDE
&& element->isDescendantOf(m_frame.document()->focusedElement()))
return true;
break;
}
element = element->parentOrShadowHostElement();
}
// Only change the focus when clicking scrollbars if it can transfered to a mouse focusable node.
if ((!element || !element->isMouseFocusable()) && isInsideScrollbar(mouseEvent.position()))
return false;
// If focus shift is blocked, we eat the event. Note we should never clear swallowEvent
// if the page already set it (e.g., by canceling default behavior).
if (Page* page = m_frame.page()) {
if (element && element->isMouseFocusable()) {
if (!page->focusController().setFocusedElement(element, &m_frame))
swallowEvent = true;
} else if (!element || !element->focused()) {
if (!page->focusController().setFocusedElement(0, &m_frame))
swallowEvent = true;
}
}
}
return !swallowEvent;
}
bool EventHandler::isInsideScrollbar(const IntPoint& windowPoint) const
{
if (RenderView* renderView = m_frame.contentRenderer()) {
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::DisallowShadowContent);
HitTestResult result(windowPoint);
renderView->hitTest(request, result);
return result.scrollbar();
}
return false;
}
#if !PLATFORM(GTK)
bool EventHandler::shouldTurnVerticalTicksIntoHorizontal(const HitTestResult&, const PlatformWheelEvent&) const
{
return false;
}
#endif
void EventHandler::recordWheelEventDelta(const PlatformWheelEvent& event)
{
const size_t recentEventCount = 3;
m_recentWheelEventDeltas.append(FloatSize(event.deltaX(), event.deltaY()));
if (m_recentWheelEventDeltas.size() > recentEventCount)
m_recentWheelEventDeltas.removeFirst();
}
static bool deltaIsPredominantlyVertical(const FloatSize& delta)
{
return fabs(delta.height()) > fabs(delta.width());
}
EventHandler::DominantScrollGestureDirection EventHandler::dominantScrollGestureDirection() const
{
bool allVertical = m_recentWheelEventDeltas.size();
bool allHorizontal = m_recentWheelEventDeltas.size();
Deque<FloatSize>::const_iterator end = m_recentWheelEventDeltas.end();
for (Deque<FloatSize>::const_iterator it = m_recentWheelEventDeltas.begin(); it != end; ++it) {
bool isVertical = deltaIsPredominantlyVertical(*it);
allVertical &= isVertical;
allHorizontal &= !isVertical;
}
if (allVertical)
return DominantScrollDirectionVertical;
if (allHorizontal)
return DominantScrollDirectionHorizontal;
return DominantScrollDirectionNone;
}
bool EventHandler::handleWheelEvent(const PlatformWheelEvent& e)
{
Document* document = m_frame.document();
if (!document->renderView())
return false;
RefPtr<FrameView> protector(m_frame.view());
FrameView* view = m_frame.view();
if (!view)
return false;
m_isHandlingWheelEvent = true;
setFrameWasScrolledByUser();
LayoutPoint vPoint = view->windowToContents(e.position());
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::DisallowShadowContent);
HitTestResult result(vPoint);
document->renderView()->hitTest(request, result);
bool useLatchedWheelEventElement = e.useLatchedEventElement();
Element* element = result.innerElement();
bool isOverWidget;
if (useLatchedWheelEventElement) {
if (!m_latchedWheelEventElement) {
m_latchedWheelEventElement = element;
m_widgetIsLatched = result.isOverWidget();
} else
element = m_latchedWheelEventElement.get();
isOverWidget = m_widgetIsLatched;
} else {
if (m_latchedWheelEventElement)
m_latchedWheelEventElement = nullptr;
if (m_previousWheelScrolledElement)
m_previousWheelScrolledElement = nullptr;
isOverWidget = result.isOverWidget();
}
// FIXME: It should not be necessary to do this mutation here.
// Instead, the handlers should know convert vertical scrolls
// appropriately.
PlatformWheelEvent event = e;
if (m_baseEventType == PlatformEvent::NoType && shouldTurnVerticalTicksIntoHorizontal(result, e))
event = event.copyTurningVerticalTicksIntoHorizontalTicks();
#if PLATFORM(MAC)
switch (event.phase()) {
case PlatformWheelEventPhaseBegan:
m_recentWheelEventDeltas.clear();
m_inTrackingScrollGesturePhase = true;
break;
case PlatformWheelEventPhaseEnded:
m_inTrackingScrollGesturePhase = false;
break;
default:
break;
}
#endif
recordWheelEventDelta(event);
if (element) {
// Figure out which view to send the event to.
RenderElement* target = element->renderer();
if (isOverWidget && target && target->isWidget()) {
Widget* widget = toRenderWidget(target)->widget();
if (widget && passWheelEventToWidget(e, widget)) {
m_isHandlingWheelEvent = false;
return true;
}
}
if (!element->dispatchWheelEvent(event)) {
m_isHandlingWheelEvent = false;
return true;
}
}
// We do another check on the frame view because the event handler can run JS which results in the frame getting destroyed.
view = m_frame.view();
bool didHandleEvent = view ? view->wheelEvent(event) : false;
m_isHandlingWheelEvent = false;
return didHandleEvent;
}
void EventHandler::defaultWheelEventHandler(Node* startNode, WheelEvent* wheelEvent)
{
if (!startNode || !wheelEvent)
return;
Element* stopElement = m_previousWheelScrolledElement.get();
ScrollGranularity granularity = wheelGranularityToScrollGranularity(wheelEvent->deltaMode());
DominantScrollGestureDirection dominantDirection = DominantScrollDirectionNone;
// Workaround for scrolling issues in iTunes (<rdar://problem/14758615>).
if (m_inTrackingScrollGesturePhase && applicationIsITunes())
dominantDirection = dominantScrollGestureDirection();
// Break up into two scrolls if we need to. Diagonal movement on
// a MacBook pro is an example of a 2-dimensional mouse wheel event (where both deltaX and deltaY can be set).
if (dominantDirection != DominantScrollDirectionVertical && scrollNode(wheelEvent->deltaX(), granularity, ScrollRight, ScrollLeft, startNode, &stopElement))
wheelEvent->setDefaultHandled();
if (dominantDirection != DominantScrollDirectionHorizontal && scrollNode(wheelEvent->deltaY(), granularity, ScrollDown, ScrollUp, startNode, &stopElement))
wheelEvent->setDefaultHandled();
if (!m_latchedWheelEventElement)
m_previousWheelScrolledElement = stopElement;
}
#if ENABLE(TOUCH_ADJUSTMENT)
bool EventHandler::bestClickableNodeForTouchPoint(const IntPoint& touchCenter, const IntSize& touchRadius, IntPoint& targetPoint, Node*& targetNode)
{
IntPoint hitTestPoint = m_frame.view()->windowToContents(touchCenter);
HitTestResult result = hitTestResultAtPoint(hitTestPoint, HitTestRequest::ReadOnly | HitTestRequest::Active, touchRadius);
IntRect touchRect(touchCenter - touchRadius, touchRadius + touchRadius);
// FIXME: Should be able to handle targetNode being a shadow DOM node to avoid performing uncessary hit tests
// in the case where further processing on the node is required. Returning the shadow ancestor prevents a
// regression in touchadjustment/html-label.html. Some refinement is required to testing/internals to
// handle targetNode being a shadow DOM node.
bool success = findBestClickableCandidate(targetNode, targetPoint, touchCenter, touchRect, result.rectBasedTestResult());
if (success && targetNode)
targetNode = targetNode->deprecatedShadowAncestorNode();
return success;
}
bool EventHandler::bestContextMenuNodeForTouchPoint(const IntPoint& touchCenter, const IntSize& touchRadius, IntPoint& targetPoint, Node*& targetNode)
{
IntPoint hitTestPoint = m_frame.view()->windowToContents(touchCenter);
HitTestResult result = hitTestResultAtPoint(hitTestPoint, HitTestRequest::ReadOnly | HitTestRequest::Active, touchRadius);
IntRect touchRect(touchCenter - touchRadius, touchRadius + touchRadius);
return findBestContextMenuCandidate(targetNode, targetPoint, touchCenter, touchRect, result.rectBasedTestResult());
}
bool EventHandler::bestZoomableAreaForTouchPoint(const IntPoint& touchCenter, const IntSize& touchRadius, IntRect& targetArea, Node*& targetNode)
{
IntPoint hitTestPoint = m_frame.view()->windowToContents(touchCenter);
HitTestResult result = hitTestResultAtPoint(hitTestPoint, HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::DisallowShadowContent, touchRadius);
IntRect touchRect(touchCenter - touchRadius, touchRadius + touchRadius);
return findBestZoomableArea(targetNode, targetArea, touchCenter, touchRect, result.rectBasedTestResult());
}
#endif
#if ENABLE(CONTEXT_MENUS)
bool EventHandler::sendContextMenuEvent(const PlatformMouseEvent& event)
{
Document* doc = m_frame.document();
FrameView* v = m_frame.view();
if (!v)
return false;
// Clear mouse press state to avoid initiating a drag while context menu is up.
m_mousePressed = false;
bool swallowEvent;
LayoutPoint viewportPos = v->windowToContents(event.position());
HitTestRequest request(HitTestRequest::Active | HitTestRequest::DisallowShadowContent);
MouseEventWithHitTestResults mev = doc->prepareMouseEvent(request, viewportPos, event);
if (m_frame.editor().behavior().shouldSelectOnContextualMenuClick()
&& !m_frame.selection().contains(viewportPos)
&& !mev.scrollbar()
// 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().isContentEditable() || (mev.targetNode() && mev.targetNode()->isTextNode()))) {
m_mouseDownMayStartSelect = true; // context menu events are always allowed to perform a selection
selectClosestWordOrLinkFromMouseEvent(mev);
}
swallowEvent = !dispatchMouseEvent(eventNames().contextmenuEvent, mev.targetNode(), true, 0, event, false);
return swallowEvent;
}
bool EventHandler::sendContextMenuEventForKey()
{
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) && !OS(WINCE)
int rightAligned = ::GetSystemMetrics(SM_MENUDROPALIGNMENT);
#else
int rightAligned = 0;
#endif
IntPoint location;
Element* focusedElement = doc->focusedElement();
FrameSelection& selection = m_frame.selection();
Position start = selection.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 clippedRect = box->pixelSnappedAbsoluteClippedOverflowRect();
location = IntPoint(clippedRect.x(), clippedRect.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::DisallowShadowContent, result.innerElement());
// 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 mouseEvent(position, globalPosition, RightButton, eventType, 1, false, false, false, false, WTF::currentTime());
return !dispatchMouseEvent(eventNames().contextmenuEvent, targetNode, true, 0, mouseEvent, false);
}
#endif // ENABLE(CONTEXT_MENUS)
void EventHandler::scheduleHoverStateUpdate()
{
if (!m_hoverTimer.isActive())
m_hoverTimer.startOneShot(0);
}
void EventHandler::scheduleCursorUpdate()
{
if (!m_cursorUpdateTimer.isActive())
m_cursorUpdateTimer.startOneShot(cursorUpdateInterval);
}
void EventHandler::dispatchFakeMouseMoveEventSoon()
{
if (m_mousePressed)
return;
if (m_mousePositionIsUnknown)
return;
if (!m_frame.settings().deviceSupportsMouse())
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_maxMouseMovedDuration > fakeMouseMoveDurationThreshold) {
if (m_fakeMouseMoveEventTimer.isActive())
m_fakeMouseMoveEventTimer.stop();
m_fakeMouseMoveEventTimer.startOneShot(fakeMouseMoveLongInterval);
} else {
if (!m_fakeMouseMoveEventTimer.isActive())
m_fakeMouseMoveEventTimer.startOneShot(fakeMouseMoveShortInterval);
}
}
void EventHandler::dispatchFakeMouseMoveEventSoonInQuad(const FloatQuad& quad)
{
FrameView* view = m_frame.view();
if (!view)
return;
if (!quad.containsPoint(view->windowToContents(m_lastKnownMousePosition)))
return;
dispatchFakeMouseMoveEventSoon();
}
void EventHandler::cancelFakeMouseMoveEvent()
{
m_fakeMouseMoveEventTimer.stop();
}
void EventHandler::fakeMouseMoveEventTimerFired(Timer<EventHandler>* timer)
{
ASSERT_UNUSED(timer, timer == &m_fakeMouseMoveEventTimer);
ASSERT(!m_mousePressed);
if (!m_frame.settings().deviceSupportsMouse())
return;
FrameView* view = m_frame.view();
if (!view)
return;
if (!m_frame.page() || !m_frame.page()->isOnscreen() || !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, currentTime());
mouseMoved(fakeMouseMoveEvent);
}
void EventHandler::setResizingFrameSet(HTMLFrameSetElement* frameSet)
{
m_frameSetBeingResized = frameSet;
}
void EventHandler::resizeLayerDestroyed()
{
ASSERT(m_resizeLayer);
m_resizeLayer = 0;
}
void EventHandler::hoverTimerFired(Timer<EventHandler>*)
{
m_hoverTimer.stop();
ASSERT(m_frame.document());
if (RenderView* renderer = m_frame.contentRenderer()) {
if (FrameView* view = m_frame.view()) {
HitTestRequest request(HitTestRequest::Move | HitTestRequest::DisallowShadowContent);
HitTestResult result(view->windowToContents(m_lastKnownMousePosition));
renderer->hitTest(request, result);
m_frame.document()->updateHoverActiveState(request, result.innerElement());
}
}
}
bool EventHandler::handleAccessKey(const PlatformKeyboardEvent& evt)
{
// 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() & PlatformEvent::ShiftKey));
if ((evt.modifiers() & ~PlatformEvent::ShiftKey) != accessKeyModifiers())
return false;
String key = evt.unmodifiedText();
Element* elem = m_frame.document()->getElementByAccessKey(key.lower());
if (!elem)
return false;
elem->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->webkitFullScreenKeyboardInputAllowed())
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& initialKeyEvent)
{
RefPtr<FrameView> protector(m_frame.view());
#if ENABLE(FULLSCREEN_API)
if (m_frame.document()->webkitIsFullScreen() && !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;
UserGestureIndicator gestureIndicator(DefinitelyProcessingUserGesture);
UserTypingGestureIndicator typingGestureIndicator(m_frame);
if (FrameView* view = m_frame.view())
view->resetDeferredRepaintDelay();
// 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);
RefPtr<KeyboardEvent> keydown = KeyboardEvent::create(keyDownEvent, m_frame.document()->defaultView());
if (matchedAnAccessKey)
keydown->setDefaultPrevented(true);
keydown->setTarget(element);
if (initialKeyEvent.type() == PlatformEvent::RawKeyDown) {
element->dispatchEvent(keydown, IGNORE_EXCEPTION);
// 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.document()->defaultView());
keydown->setTarget(element);
keydown->setDefaultHandled();
}
element->dispatchEvent(keydown, IGNORE_EXCEPTION);
// 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 (handledByInputMethod || (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;
RefPtr<KeyboardEvent> keypress = KeyboardEvent::create(keyPressEvent, m_frame.document()->defaultView());
keypress->setTarget(element);
if (keydownResult)
keypress->setDefaultPrevented(true);
#if PLATFORM(MAC)
keypress->keypressCommands() = keydown->keypressCommands();
#endif
element->dispatchEvent(keypress, IGNORE_EXCEPTION);
return keydownResult || keypress->defaultPrevented() || keypress->defaultHandled();
}
static FocusDirection focusDirectionForKey(const AtomicString& keyIdentifier)
{
DEFINE_STATIC_LOCAL(AtomicString, Down, ("Down", AtomicString::ConstructFromLiteral));
DEFINE_STATIC_LOCAL(AtomicString, Up, ("Up", AtomicString::ConstructFromLiteral));
DEFINE_STATIC_LOCAL(AtomicString, Left, ("Left", AtomicString::ConstructFromLiteral));
DEFINE_STATIC_LOCAL(AtomicString, Right, ("Right", AtomicString::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 handleKeyboardSelectionMovement(FrameSelection& selection, KeyboardEvent* event)
{
if (!event)
return;
bool isOptioned = event->getModifierState("Alt");
bool isCommanded = event->getModifierState("Meta");
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;
}
FrameSelection::EAlteration alternation = event->getModifierState("Shift") ? FrameSelection::AlterationExtend : FrameSelection::AlterationMove;
selection.modify(alternation, direction, granularity, UserTriggered);
event->setDefaultHandled();
}
void EventHandler::handleKeyboardSelectionMovementForAccessibility(KeyboardEvent* event)
{
if (event->type() == eventNames().keydownEvent) {
if (AXObjectCache::accessibilityEnhancedUserInterfaceEnabled())
handleKeyboardSelectionMovement(m_frame.selection(), event);
}
}
void EventHandler::defaultKeyboardEventHandler(KeyboardEvent* event)
{
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
{
FrameView* view = m_frame.view();
if (!view)
return false;
IntPoint dragLocation = view->windowToContents(flooredIntPoint(dragViewportLocation));
IntSize delta = dragLocation - m_mouseDownPos;
int threshold = GeneralDragHysteresis;
switch (dragState().type) {
case DragSourceActionSelection:
threshold = TextDragHysteresis;
break;
case DragSourceActionImage:
threshold = ImageDragHysteresis;
break;
case DragSourceActionLink:
threshold = LinkDragHysteresis;
break;
case DragSourceActionDHTML:
break;
case DragSourceActionNone:
case DragSourceActionAny:
ASSERT_NOT_REACHED();
}
return abs(delta.width()) >= threshold || abs(delta.height()) >= threshold;
}
void EventHandler::freeClipboard()
{
if (!dragState().clipboard)
return;
dragState().clipboard->setAccessPolicy(ClipboardNumb);
dragState().clipboard = 0;
}
void EventHandler::dragSourceEndedAt(const PlatformMouseEvent& event, DragOperation operation)
{
// Send a hit test request so that RenderLayer gets a chance to update the :hover and :active pseudoclasses.
HitTestRequest request(HitTestRequest::Release | HitTestRequest::DisallowShadowContent);
prepareMouseEvent(request, event);
if (dragState().source && dragState().shouldDispatchEvents) {
dragState().clipboard->setDestinationOperation(operation);
// For now we don't care if event handler cancels default behavior, since there is no default behavior.
dispatchDragSrcEvent(eventNames().dragendEvent, event);
}
freeClipboard();
dragState().source = 0;
// 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->inDocument())
dragState().source = rootEditableElement;
}
// Return value indicates if we should continue "default processing", i.e., whether event handler canceled.
bool EventHandler::dispatchDragSrcEvent(const AtomicString& eventType, const PlatformMouseEvent& event)
{
return !dispatchDragEvent(eventType, *dragState().source, event, dragState().clipboard.get());
}
static bool ExactlyOneBitSet(DragSourceAction n)
{
return n && !(n & (n - 1));
}
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;
}
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::DisallowShadowContent);
HitTestResult result(m_mouseDownPos);
m_frame.contentRenderer()->hitTest(request, result);
if (m_frame.page())
dragState().source = m_frame.page()->dragController().draggableElement(&m_frame, result.innerElement(), 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 = 0;
// ... 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;
if (!ExactlyOneBitSet(dragState().type)) {
ASSERT((dragState().type & DragSourceActionSelection));
ASSERT((dragState().type & ~DragSourceActionSelection) == DragSourceActionDHTML
|| (dragState().type & ~DragSourceActionSelection) == DragSourceActionImage
|| (dragState().type & ~DragSourceActionSelection) == DragSourceActionLink);
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 clipboard gets numbed.
freeClipboard();
dragState().clipboard = createDraggingClipboard();
if (dragState().shouldDispatchEvents) {
// Check to see if the is a DOM based drag. If it is, get the DOM specified drag image and offset.
if (dragState().type == DragSourceActionDHTML) {
if (RenderObject* renderer = dragState().source->renderer()) {
// FIXME: This doesn't work correctly with transforms.
FloatPoint absPos = renderer->localToAbsolute();
IntSize delta = m_mouseDownPos - roundedIntPoint(absPos);
dragState().clipboard->setDragImage(dragState().source.get(), delta.width(), delta.height());
} else {
// The renderer has disappeared, this can happen if the onStartDrag handler has hidden
// the element in some way. In this case we just kill the drag.
m_mouseDownMayStartDrag = false;
goto cleanupDrag;
}
}
m_mouseDownMayStartDrag = dispatchDragSrcEvent(eventNames().dragstartEvent, m_mouseDown)
&& !m_frame.selection().isInPasswordField();
// Invalidate clipboard here against anymore pasteboard writing for security. The drag
// image can still be changed as we drag, but not the pasteboard data.
dragState().clipboard->setAccessPolicy(ClipboardImageWritable);
if (m_mouseDownMayStartDrag) {
// Gather values from DHTML element, if it set any.
srcOp = dragState().clipboard->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().clipboard->setDragHasStarted();
}
}
if (m_mouseDownMayStartDrag) {
Page* page = m_frame.page();
m_didStartDrag = page && page->dragController().startDrag(m_frame, dragState(), srcOp, event.event(), m_mouseDownPos);
// 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;
}
}
cleanupDrag:
if (!m_mouseDownMayStartDrag) {
// Something failed to start the drag, clean up.
freeClipboard();
dragState().source = 0;
}
// No more default handling (like selection), whether we're past the hysteresis bounds or not
return true;
}
#endif // ENABLE(DRAG_SUPPORT)
bool EventHandler::handleTextInputEvent(const String& text, Event* underlyingEvent, TextEventInputType inputType)
{
// 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(!underlyingEvent || !underlyingEvent->isKeyboardEvent() || static_cast<KeyboardEvent*>(underlyingEvent)->type() == eventNames().keypressEvent);
EventTarget* target;
if (underlyingEvent)
target = underlyingEvent->target();
else
target = eventTargetElementForDocument(m_frame.document());
if (!target)
return false;
if (FrameView* view = m_frame.view())
view->resetDeferredRepaintDelay();
RefPtr<TextEvent> event = TextEvent::create(m_frame.document()->domWindow(), text, inputType);
event->setUnderlyingEvent(underlyingEvent);
target->dispatchEvent(event, IGNORE_EXCEPTION);
return event->defaultHandled();
}
bool EventHandler::isKeyboardOptionTab(KeyboardEvent* event)
{
return event
&& (event->type() == eventNames().keydownEvent || event->type() == eventNames().keypressEvent)
&& event->altKey()
&& event->keyIdentifier() == "U+0009";
}
bool EventHandler::eventInvertsTabsToLinksClientCallResult(KeyboardEvent* event)
{
#if PLATFORM(MAC) || PLATFORM(EFL)
return EventHandler::isKeyboardOptionTab(event);
#else
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 eventInvertsTabsToLinksClientCallResult(event) ? !tabsToLinksClientCallResult : tabsToLinksClientCallResult;
}
void EventHandler::defaultTextInputEventHandler(TextEvent* event)
{
if (m_frame.editor().handleTextEvent(event))
event->setDefaultHandled();
}
void EventHandler::defaultSpaceEventHandler(KeyboardEvent* event)
{
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->goForward();
else
handledEvent = page->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)
{
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::capsLockStateMayHaveChanged()
{
Document* d = m_frame.document();
if (Element* element = d->focusedElement()) {
if (RenderObject* r = element->renderer()) {
if (r->isTextField())
toRenderTextControlSingleLine(r)->capsLockStateMayHaveChanged();
}
}
}
void EventHandler::sendScrollEvent()
{
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& mev, Scrollbar* scrollbar)
{
if (!scrollbar || !scrollbar->enabled())
return false;
setFrameWasScrolledByUser();
return scrollbar->mouseDown(mev.event());
}
// If scrollbar (under mouse) is different from last, send a mouse exited. Set
// last to scrollbar if setLast is true; else set last to 0.
void EventHandler::updateLastScrollbarUnderMouse(Scrollbar* scrollbar, bool setLast)
{
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 && setLast)
scrollbar->mouseEntered();
m_lastScrollbarUnderMouse = setLast ? scrollbar : 0;
}
}
#if ENABLE(TOUCH_EVENTS)
static const AtomicString& 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;
}
}
HitTestResult EventHandler::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->contentRenderer()->hitTest(HitTestRequest(hitType), result);
return result;
}
bool EventHandler::handleTouchEvent(const PlatformTouchEvent& event)
{
// 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(DefinitelyProcessingUserGesture);
unsigned i;
bool freshTouchEvents = true;
bool allTouchReleased = true;
for (i = 0; i < points.size(); ++i) {
const PlatformTouchPoint& point = points[i];
if (point.state() != PlatformTouchPoint::TouchPressed)
freshTouchEvents = false;
if (point.state() != PlatformTouchPoint::TouchReleased && point.state() != PlatformTouchPoint::TouchCancelled)
allTouchReleased = false;
}
for (i = 0; i < points.size(); ++i) {
const PlatformTouchPoint& point = points[i];
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);
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;
// FIXME: This code should use Element* instead of Node*.
Node* node = result.innerElement();
ASSERT(node);
if (InspectorInstrumentation::handleTouchEvent(m_frame.page(), node))
return true;
Document& doc = node->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, node);
touchTarget = node;
} 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 (!touchTarget.get())
continue;
Document& doc = touchTarget->toNode()->document();
if (!doc.hasTouchEventHandlers())
continue;
Frame* targetFrame = doc.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);
RefPtr<Touch> 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);
targetTouchesIterator->value->append(touch);
}
// 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(touch);
changedTouches[pointState].m_targets.add(touchTarget);
}
}
m_touchPressed = touches->length() > 0;
if (allTouchReleased)
m_originatingTouchPointDocument.clear();
// 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 AtomicString& stateName(eventNameForTouchPointState(static_cast<PlatformTouchPoint::State>(state)));
const EventTargetSet& targetsForState = changedTouches[state].m_targets;
for (EventTargetSet::const_iterator it = targetsForState.begin(); it != targetsForState.end(); ++it) {
EventTarget* touchEventTarget = it->get();
RefPtr<TouchList> targetTouches(isTouchCancelEvent ? emptyList : touchesByTarget.get(touchEventTarget));
ASSERT(targetTouches);
RefPtr<TouchEvent> touchEvent =
TouchEvent::create(effectiveTouches.get(), targetTouches.get(), changedTouches[state].m_touches.get(),
stateName, touchEventTarget->toNode()->document().defaultView(),
0, 0, 0, 0, event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey());
touchEventTarget->toNode()->dispatchTouchEvent(touchEvent.get());
swallowedEvent = swallowedEvent || touchEvent->defaultPrevented() || touchEvent->defaultHandled();
}
}
return swallowedEvent;
}
bool EventHandler::dispatchSyntheticTouchEventIfEnabled(const PlatformMouseEvent& event)
{
if (!m_frame.settings().isTouchEventEmulationEnabled())
return false;
PlatformEvent::Type eventType = event.type();
if (eventType != PlatformEvent::MouseMoved && eventType != PlatformEvent::MousePressed && eventType != PlatformEvent::MouseReleased)
return false;
HitTestRequest request(HitTestRequest::Active | HitTestRequest::DisallowShadowContent);
MouseEventWithHitTestResults mev = prepareMouseEvent(request, event);
if (mev.scrollbar() || subframeForHitTestResult(mev))
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(event);
return handleTouchEvent(touchEvent);
}
#endif
void EventHandler::setLastKnownMousePosition(const PlatformMouseEvent& event)
{
m_mousePositionIsUnknown = false;
m_lastKnownMousePosition = event.position();
m_lastKnownMouseGlobalPosition = event.globalPosition();
}
} // namespace WebCore