C++程序
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/*
* Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
* Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
*
* 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 "CachedImage.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "Cursor.h"
#include "CursorList.h"
#include "Document.h"
#include "DragController.h"
#include "Editor.h"
#include "EventNames.h"
#include "EventQueue.h"
#include "FloatPoint.h"
#include "FloatRect.h"
#include "FocusController.h"
#include "Frame.h"
#include "FrameLoader.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 "MouseEvent.h"
#include "MouseEventWithHitTestResults.h"
#include "Page.h"
#include "PlatformKeyboardEvent.h"
#include "PlatformWheelEvent.h"
#include "PluginDocument.h"
#if defined(ANDROID_PLUGINS)
#include "PluginView.h"
#endif
#include "RenderFrameSet.h"
#include "RenderLayer.h"
#include "RenderTextControlSingleLine.h"
#include "RenderView.h"
#include "RenderWidget.h"
#include "ScrollAnimator.h"
#include "Scrollbar.h"
#include "SelectionController.h"
#include "Settings.h"
#include "StyleCachedImage.h"
#include "TextEvent.h"
#include "TextIterator.h"
#include "UserGestureIndicator.h"
#include "UserTypingGestureIndicator.h"
#include "WheelEvent.h"
#include "WindowsKeyboardCodes.h"
#include <wtf/CurrentTime.h>
#include <wtf/StdLibExtras.h>
#if ENABLE(GESTURE_EVENTS)
#include "PlatformGestureEvent.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"
#endif
#if ENABLE(GESTURE_RECOGNIZER)
#include "PlatformGestureRecognizer.h"
#endif
#if defined(ANDROID_PLUGINS)
#include "WebViewCore.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
// When the autoscroll or the panScroll is triggered when do the scroll every 0.05s to make it smooth
const double autoscrollInterval = 0.05;
const double fakeMouseMoveInterval = 0.1;
static inline bool scrollNode(float delta, WheelEvent::Granularity granularity, ScrollDirection positiveDirection, ScrollDirection negativeDirection, Node* node, Node** stopNode)
{
if (!delta)
return false;
if (!node->renderer())
return false;
// Find the nearest enclosing box.
RenderBox* enclosingBox = node->renderer()->enclosingBox();
float absDelta = delta > 0 ? delta : -delta;
if (granularity == WheelEvent::Page)
return enclosingBox->scroll(delta < 0 ? negativeDirection : positiveDirection, ScrollByPage, absDelta, stopNode);
if (granularity == WheelEvent::Line)
return enclosingBox->scroll(delta < 0 ? negativeDirection : positiveDirection, ScrollByLine, absDelta, stopNode);
if (granularity == WheelEvent::Pixel)
return enclosingBox->scroll(delta < 0 ? negativeDirection : positiveDirection, ScrollByPixel, absDelta, stopNode);
return false;
}
#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)
#endif
, m_mouseDownWasSingleClickInSelection(false)
, m_beganSelectingText(false)
, m_panScrollInProgress(false)
, m_panScrollButtonPressed(false)
, m_springLoadedPanScrollInProgress(false)
, m_hoverTimer(this, &EventHandler::hoverTimerFired)
, m_autoscrollTimer(this, &EventHandler::autoscrollTimerFired)
, m_autoscrollRenderer(0)
, m_autoscrollInProgress(false)
, m_mouseDownMayStartAutoscroll(false)
, m_mouseDownWasInSubframe(false)
, m_fakeMouseMoveEventTimer(this, &EventHandler::fakeMouseMoveEventTimerFired)
#if ENABLE(SVG)
, m_svgPan(false)
#endif
, m_resizeLayer(0)
, m_eventHandlerWillResetCapturingMouseEventsNode(0)
, m_clickCount(0)
, m_mouseDownTimestamp(0)
, m_useLatchedWheelEventNode(false)
, m_widgetIsLatched(false)
#if PLATFORM(MAC)
, m_mouseDownView(nil)
, m_sendingEventToSubview(false)
, m_activationEventNumber(-1)
#endif
#if ENABLE(TOUCH_EVENTS)
, m_touchPressed(false)
#endif
#if ENABLE(GESTURE_RECOGNIZER)
, m_gestureRecognizer(PlatformGestureRecognizer::create())
#endif
{
}
EventHandler::~EventHandler()
{
ASSERT(!m_fakeMouseMoveEventTimer.isActive());
}
#if ENABLE(DRAG_SUPPORT)
EventHandler::EventHandlerDragState& EventHandler::dragState()
{
DEFINE_STATIC_LOCAL(EventHandlerDragState, state, ());
return state;
}
#endif // ENABLE(DRAG_SUPPORT)
void EventHandler::clear()
{
m_hoverTimer.stop();
m_fakeMouseMoveEventTimer.stop();
m_resizeLayer = 0;
m_nodeUnderMouse = 0;
m_lastNodeUnderMouse = 0;
#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_currentMousePosition = IntPoint();
m_mousePressNode = 0;
m_mousePressed = false;
m_capturesDragging = false;
m_capturingMouseEventsNode = 0;
m_latchedWheelEventNode = 0;
m_previousWheelScrolledNode = 0;
#if ENABLE(TOUCH_EVENTS)
m_originatingTouchPointTargets.clear();
#if PLATFORM(ANDROID)
m_capturingTouchEventsNode = 0;
#endif
#endif
}
static void setSelectionIfNeeded(SelectionController* selection, const VisibleSelection& newSelection)
{
ASSERT(selection);
if (selection->selection() != newSelection && selection->shouldChangeSelection(newSelection))
selection->setSelection(newSelection);
}
static void setNonDirectionalSelectionIfNeeded(SelectionController* selection, const VisibleSelection& newSelection, TextGranularity granularity)
{
ASSERT(selection);
if (selection->selection() != newSelection && selection->shouldChangeSelection(newSelection))
selection->setSelection(newSelection, granularity, MakeNonDirectionalSelection);
}
void EventHandler::selectClosestWordFromMouseEvent(const MouseEventWithHitTestResults& result)
{
Node* innerNode = targetNode(result);
VisibleSelection newSelection;
if (innerNode && innerNode->renderer() && m_mouseDownMayStartSelect) {
VisiblePosition pos(innerNode->renderer()->positionForPoint(result.localPoint()));
TextGranularity granularity = CharacterGranularity;
if (pos.isNotNull()) {
newSelection = VisibleSelection(pos);
newSelection.expandUsingGranularity(WordGranularity);
}
if (newSelection.isRange()) {
granularity = WordGranularity;
m_beganSelectingText = true;
if (result.event().clickCount() == 2 && m_frame->editor()->isSelectTrailingWhitespaceEnabled())
newSelection.appendTrailingWhitespace();
}
setNonDirectionalSelectionIfNeeded(m_frame->selection(), newSelection, granularity);
}
}
void EventHandler::selectClosestWordOrLinkFromMouseEvent(const MouseEventWithHitTestResults& result)
{
if (!result.hitTestResult().isLiveLink())
return selectClosestWordFromMouseEvent(result);
Node* innerNode = targetNode(result);
if (innerNode && innerNode->renderer() && m_mouseDownMayStartSelect) {
VisibleSelection newSelection;
Element* URLElement = result.hitTestResult().URLElement();
VisiblePosition pos(innerNode->renderer()->positionForPoint(result.localPoint()));
if (pos.isNotNull() && pos.deepEquivalent().deprecatedNode()->isDescendantOf(URLElement))
newSelection = VisibleSelection::selectionFromContentsOfNode(URLElement);
TextGranularity granularity = CharacterGranularity;
if (newSelection.isRange()) {
granularity = WordGranularity;
m_beganSelectingText = true;
}
setNonDirectionalSelectionIfNeeded(m_frame->selection(), newSelection, granularity);
}
}
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_beganSelectingText = true;
else
selectClosestWordFromMouseEvent(event);
return true;
}
bool EventHandler::handleMousePressEventTripleClick(const MouseEventWithHitTestResults& event)
{
if (event.event().button() != LeftButton)
return false;
Node* innerNode = targetNode(event);
if (!(innerNode && innerNode->renderer() && m_mouseDownMayStartSelect))
return false;
VisibleSelection newSelection;
VisiblePosition pos(innerNode->renderer()->positionForPoint(event.localPoint()));
if (pos.isNotNull()) {
newSelection = VisibleSelection(pos);
newSelection.expandUsingGranularity(ParagraphGranularity);
}
TextGranularity granularity = CharacterGranularity;
if (newSelection.isRange()) {
granularity = ParagraphGranularity;
m_beganSelectingText = true;
}
setNonDirectionalSelectionIfNeeded(m_frame->selection(), newSelection, granularity);
return true;
}
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)
{
Node* innerNode = targetNode(event);
if (!(innerNode && innerNode->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()) {
IntPoint vPoint = view->windowToContents(event.event().pos());
if (!extendSelection && m_frame->selection()->contains(vPoint)) {
m_mouseDownWasSingleClickInSelection = true;
return false;
}
}
VisiblePosition visiblePos(innerNode->renderer()->positionForPoint(event.localPoint()));
if (visiblePos.isNull())
visiblePos = VisiblePosition(firstPositionInOrBeforeNode(innerNode), DOWNSTREAM);
Position pos = visiblePos.deepEquivalent();
VisibleSelection newSelection = m_frame->selection()->selection();
TextGranularity granularity = CharacterGranularity;
if (extendSelection && newSelection.isCaretOrRange()) {
m_frame->selection()->setIsDirectional(false);
ASSERT(m_frame->settings());
if (m_frame->settings()->editingBehaviorType() == EditingMacBehavior) {
// 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());
}
m_beganSelectingText = true;
} else
newSelection = VisibleSelection(visiblePos);
setNonDirectionalSelectionIfNeeded(m_frame->selection(), newSelection, granularity);
return true;
}
bool EventHandler::handleMousePressEvent(const MouseEventWithHitTestResults& event)
{
#if ENABLE(DRAG_SUPPORT)
// Reset drag state.
dragState().m_dragSrc = 0;
#endif
cancelFakeMouseMoveEvent();
if (ScrollView* scrollView = m_frame->view()) {
if (scrollView->isPointInScrollbarCorner(event.event().pos()))
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.
m_mouseDownMayStartSelect = canMouseDownStartSelect(targetNode(event));
#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()
&& static_cast<SVGDocument*>(m_frame->document())->zoomAndPanEnabled()) {
if (event.event().shiftKey() && singleClick) {
m_svgPan = true;
static_cast<SVGDocument*>(m_frame->document())->startPan(event.event().pos());
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();
Node* innerNode = targetNode(event);
m_mousePressNode = innerNode;
#if ENABLE(DRAG_SUPPORT)
m_dragStartPos = event.event().pos();
#endif
bool swallowEvent = false;
m_mousePressed = true;
m_beganSelectingText = false;
if (event.event().clickCount() == 2)
swallowEvent = handleMousePressEventDoubleClick(event);
else if (event.event().clickCount() >= 3)
swallowEvent = handleMousePressEventTripleClick(event);
else
swallowEvent = handleMousePressEventSingleClick(event);
m_mouseDownMayStartAutoscroll = m_mouseDownMayStartSelect
|| (m_mousePressNode && m_mousePressNode->renderBox() && m_mousePressNode->renderBox()->canBeProgramaticallyScrolled(true));
return swallowEvent;
}
// There are two kinds of renderer that can autoscroll.
static bool canAutoscroll(RenderObject* renderer)
{
if (!renderer->isBox())
return false;
// Check for a box that can be scrolled in its own right.
if (toRenderBox(renderer)->canBeScrolledAndHasScrollableArea())
return true;
// Check for a box that represents the top level of a web page.
// This can be scrolled by calling Chrome::scrollRectIntoView.
// This only has an effect on the Mac platform in applications
// that put web views into scrolling containers, such as Mac OS X Mail.
// The code for this is in RenderLayer::scrollRectToVisible.
if (renderer->node() != renderer->document())
return false;
Frame* frame = renderer->frame();
if (!frame)
return false;
Page* page = frame->page();
return page && page->mainFrame() == frame;
}
#if ENABLE(DRAG_SUPPORT)
bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& event)
{
if (handleDrag(event))
return true;
if (!m_mousePressed)
return false;
Node* targetNode = EventHandler::targetNode(event);
if (event.event().button() != LeftButton || !targetNode || !targetNode->renderer())
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 && !m_panScrollInProgress) {
// Find a renderer that can autoscroll.
RenderObject* renderer = targetNode->renderer();
while (renderer && !canAutoscroll(renderer)) {
if (!renderer->parent() && renderer->node() == renderer->document() && renderer->document()->ownerElement())
renderer = renderer->document()->ownerElement()->renderer();
else
renderer = renderer->parent();
}
if (renderer) {
m_autoscrollInProgress = true;
handleAutoscroll(renderer);
}
m_mouseDownMayStartAutoscroll = false;
}
if (!m_beganSelectingText) {
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active);
HitTestResult result(m_mouseDownPos);
m_frame->document()->renderView()->layer()->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;
bool DHTMLFlag;
bool UAFlag;
allowDHTMLDrag(DHTMLFlag, UAFlag);
if (!DHTMLFlag && !UAFlag)
return false;
FrameView* view = m_frame->view();
if (!view)
return false;
HitTestRequest request(HitTestRequest::ReadOnly);
HitTestResult result(view->windowToContents(event.pos()));
m_frame->contentRenderer()->layer()->hitTest(request, result);
bool srcIsDHTML;
return result.innerNode() && result.innerNode()->renderer()->draggableNode(DHTMLFlag, UAFlag, result.point().x(), result.point().y(), srcIsDHTML);
}
void EventHandler::updateSelectionForMouseDrag()
{
FrameView* view = m_frame->view();
if (!view)
return;
RenderView* renderer = m_frame->contentRenderer();
if (!renderer)
return;
RenderLayer* layer = renderer->layer();
if (!layer)
return;
HitTestRequest request(HitTestRequest::ReadOnly |
HitTestRequest::Active |
HitTestRequest::MouseMove);
HitTestResult result(view->windowToContents(m_currentMousePosition));
layer->hitTest(request, result);
updateSelectionForMouseDrag(result);
}
static VisiblePosition selectionExtentRespectingEditingBoundary(const VisibleSelection& selection, const IntPoint& localPoint, Node* targetNode)
{
IntPoint 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 = roundedIntPoint(editableElement->renderer()->absoluteToLocal(absolutePoint));
targetNode = editableElement;
}
return targetNode->renderer()->positionForPoint(selectionEndPoint);
}
void EventHandler::updateSelectionForMouseDrag(const HitTestResult& hitTestResult)
{
if (!m_mouseDownMayStartSelect)
return;
Node* target = targetNode(hitTestResult);
if (!target)
return;
if (!canMouseDragExtendSelect(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_beganSelectingText) {
m_beganSelectingText = true;
newSelection = VisibleSelection(targetPosition);
}
newSelection.setExtent(targetPosition);
if (m_frame->selection()->granularity() != CharacterGranularity)
newSelection.expandUsingGranularity(m_frame->selection()->granularity());
setNonDirectionalSelectionIfNeeded(m_frame->selection(), newSelection, m_frame->selection()->granularity());
}
#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 (m_autoscrollInProgress)
stopAutoscrollTimer();
if (handleMouseUp(event))
return true;
// Used to prevent mouseMoveEvent from initiating a drag before
// the mouse is pressed again.
m_frame->selection()->setCaretBlinkingSuspended(false);
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_beganSelectingText
#if ENABLE(DRAG_SUPPORT)
&& m_dragStartPos == event.event().pos()
#endif
&& m_frame->selection()->isRange()
&& event.event().button() != RightButton) {
VisibleSelection newSelection;
Node* node = targetNode(event);
bool caretBrowsing = m_frame->settings()->caretBrowsingEnabled();
if (node && (caretBrowsing || node->rendererIsEditable()) && node->renderer()) {
VisiblePosition pos = node->renderer()->positionForPoint(event.localPoint());
newSelection = VisibleSelection(pos);
}
setSelectionIfNeeded(m_frame->selection(), newSelection);
handled = true;
}
m_frame->selection()->notifyRendererOfSelectionChange(true);
m_frame->selection()->selectFrameElementInParentIfFullySelected();
return handled;
}
void EventHandler::handleAutoscroll(RenderObject* renderer)
{
// We don't want to trigger the autoscroll or the panScroll if it's already active
if (m_autoscrollTimer.isActive())
return;
setAutoscrollRenderer(renderer);
#if ENABLE(PAN_SCROLLING)
if (m_panScrollInProgress) {
m_panScrollStartPos = currentMousePosition();
if (FrameView* view = m_frame->view())
view->addPanScrollIcon(m_panScrollStartPos);
// If we're not in the top frame we notify it that we doing a panScroll.
if (Page* page = m_frame->page()) {
Frame* mainFrame = page->mainFrame();
if (m_frame != mainFrame)
mainFrame->eventHandler()->setPanScrollInProgress(true);
}
}
#endif
startAutoscrollTimer();
}
void EventHandler::autoscrollTimerFired(Timer<EventHandler>*)
{
RenderObject* r = autoscrollRenderer();
if (!r || !r->isBox()) {
stopAutoscrollTimer();
return;
}
if (m_autoscrollInProgress) {
if (!m_mousePressed) {
stopAutoscrollTimer();
return;
}
toRenderBox(r)->autoscroll();
} else {
// we verify that the main frame hasn't received the order to stop the panScroll
if (Page* page = m_frame->page()) {
if (!page->mainFrame()->eventHandler()->panScrollInProgress()) {
stopAutoscrollTimer();
return;
}
}
#if ENABLE(PAN_SCROLLING)
updatePanScrollState();
toRenderBox(r)->panScroll(m_panScrollStartPos);
#endif
}
}
#if ENABLE(PAN_SCROLLING)
void EventHandler::startPanScrolling(RenderObject* renderer)
{
m_panScrollInProgress = true;
m_panScrollButtonPressed = true;
handleAutoscroll(renderer);
invalidateClick();
}
void EventHandler::updatePanScrollState()
{
FrameView* view = m_frame->view();
if (!view)
return;
// At the original click location we draw a 4 arrowed icon. Over this icon there won't be any scroll
// So we don't want to change the cursor over this area
bool east = m_panScrollStartPos.x() < (m_currentMousePosition.x() - ScrollView::noPanScrollRadius);
bool west = m_panScrollStartPos.x() > (m_currentMousePosition.x() + ScrollView::noPanScrollRadius);
bool north = m_panScrollStartPos.y() > (m_currentMousePosition.y() + ScrollView::noPanScrollRadius);
bool south = m_panScrollStartPos.y() < (m_currentMousePosition.y() - ScrollView::noPanScrollRadius);
if ((east || west || north || south) && m_panScrollButtonPressed)
m_springLoadedPanScrollInProgress = true;
if (north) {
if (east)
view->setCursor(northEastPanningCursor());
else if (west)
view->setCursor(northWestPanningCursor());
else
view->setCursor(northPanningCursor());
} else if (south) {
if (east)
view->setCursor(southEastPanningCursor());
else if (west)
view->setCursor(southWestPanningCursor());
else
view->setCursor(southPanningCursor());
} else if (east)
view->setCursor(eastPanningCursor());
else if (west)
view->setCursor(westPanningCursor());
else
view->setCursor(middlePanningCursor());
}
#endif // ENABLE(PAN_SCROLLING)
RenderObject* EventHandler::autoscrollRenderer() const
{
return m_autoscrollRenderer;
}
void EventHandler::updateAutoscrollRenderer()
{
if (!m_autoscrollRenderer)
return;
HitTestResult hitTest = hitTestResultAtPoint(m_panScrollStartPos, true);
if (Node* nodeAtPoint = hitTest.innerNode())
m_autoscrollRenderer = nodeAtPoint->renderer();
while (m_autoscrollRenderer && !canAutoscroll(m_autoscrollRenderer))
m_autoscrollRenderer = m_autoscrollRenderer->parent();
}
void EventHandler::setAutoscrollRenderer(RenderObject* renderer)
{
m_autoscrollRenderer = renderer;
}
#if ENABLE(DRAG_SUPPORT)
void EventHandler::allowDHTMLDrag(bool& flagDHTML, bool& flagUA) const
{
flagDHTML = false;
flagUA = false;
if (!m_frame)
return;
Page* page = m_frame->page();
if (!page)
return;
FrameView* view = m_frame->view();
if (!view)
return;
unsigned mask = page->dragController()->delegateDragSourceAction(view->contentsToWindow(m_mouseDownPos));
flagDHTML = (mask & DragSourceActionDHTML) != DragSourceActionNone;
flagUA = ((mask & DragSourceActionImage) || (mask & DragSourceActionLink) || (mask & DragSourceActionSelection));
}
#endif // ENABLE(DRAG_SUPPORT)
HitTestResult EventHandler::hitTestResultAtPoint(const IntPoint& point, bool allowShadowContent, bool ignoreClipping, HitTestScrollbars testScrollbars, HitTestRequest::HitTestRequestType hitType, const IntSize& padding)
{
HitTestResult result(point, padding.height(), padding.width(), padding.height(), padding.width());
if (!m_frame->contentRenderer())
return result;
if (ignoreClipping)
hitType |= HitTestRequest::IgnoreClipping;
m_frame->contentRenderer()->layer()->hitTest(HitTestRequest(hitType), result);
while (true) {
Node* n = result.innerNode();
if (!result.isOverWidget() || !n || !n->renderer() || !n->renderer()->isWidget())
break;
RenderWidget* renderWidget = toRenderWidget(n->renderer());
Widget* widget = renderWidget->widget();
if (!widget || !widget->isFrameView())
break;
Frame* frame = static_cast<HTMLFrameElementBase*>(n)->contentFrame();
if (!frame || !frame->contentRenderer())
break;
FrameView* view = static_cast<FrameView*>(widget);
IntPoint widgetPoint(result.localPoint().x() + view->scrollX() - renderWidget->borderLeft() - renderWidget->paddingLeft(),
result.localPoint().y() + view->scrollY() - renderWidget->borderTop() - renderWidget->paddingTop());
HitTestResult widgetHitTestResult(widgetPoint, padding.height(), padding.width(), padding.height(), padding.width());
frame->contentRenderer()->layer()->hitTest(HitTestRequest(hitType), widgetHitTestResult);
result = widgetHitTestResult;
if (testScrollbars == ShouldHitTestScrollbars) {
Scrollbar* eventScrollbar = view->scrollbarAtPoint(point);
if (eventScrollbar)
result.setScrollbar(eventScrollbar);
}
}
// If our HitTestResult is not visible, then we started hit testing too far down the frame chain.
// Another hit test at the main frame level should get us the correct visible result.
Frame* resultFrame = result.innerNonSharedNode() ? result.innerNonSharedNode()->document()->frame() : 0;
if (Page* page = m_frame->page()) {
Frame* mainFrame = page->mainFrame();
if (m_frame != mainFrame && resultFrame && resultFrame != mainFrame && !resultFrame->editor()->insideVisibleArea(result.point())) {
FrameView* resultView = resultFrame->view();
FrameView* mainView = mainFrame->view();
if (resultView && mainView) {
IntPoint windowPoint = resultView->contentsToWindow(result.point());
IntPoint mainFramePoint = mainView->windowToContents(windowPoint);
result = mainFrame->eventHandler()->hitTestResultAtPoint(mainFramePoint, allowShadowContent, ignoreClipping, testScrollbars, hitType, padding);
}
}
}
if (!allowShadowContent)
result.setToNonShadowAncestor();
return result;
}
void EventHandler::startAutoscrollTimer()
{
m_autoscrollTimer.startRepeating(autoscrollInterval);
}
void EventHandler::stopAutoscrollTimer(bool rendererIsBeingDestroyed)
{
if (m_autoscrollInProgress) {
if (m_mouseDownWasInSubframe) {
if (Frame* subframe = subframeForTargetNode(m_mousePressNode.get()))
subframe->eventHandler()->stopAutoscrollTimer(rendererIsBeingDestroyed);
return;
}
}
if (autoscrollRenderer()) {
if (!rendererIsBeingDestroyed && (m_autoscrollInProgress || m_panScrollInProgress))
toRenderBox(autoscrollRenderer())->stopAutoscroll();
#if ENABLE(PAN_SCROLLING)
if (m_panScrollInProgress) {
if (FrameView* view = m_frame->view()) {
view->removePanScrollIcon();
view->setCursor(pointerCursor());
}
}
#endif
setAutoscrollRenderer(0);
}
m_autoscrollTimer.stop();
m_panScrollInProgress = false;
m_springLoadedPanScrollInProgress = false;
// If we're not in the top frame we notify it that we are not doing a panScroll any more.
if (Page* page = m_frame->page()) {
Frame* mainFrame = page->mainFrame();
if (m_frame != mainFrame)
mainFrame->eventHandler()->setPanScrollInProgress(false);
}
m_autoscrollInProgress = false;
}
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()->focusedNode();
if (!node)
node = m_mousePressNode.get();
if (node) {
RenderObject* 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()->focusedNode();
if (!node)
node = m_mousePressNode.get();
if (node) {
RenderObject* 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::currentMousePosition() const
{
return m_currentMousePosition;
}
Frame* EventHandler::subframeForHitTestResult(const MouseEventWithHitTestResults& hitTestResult)
{
if (!hitTestResult.isOverWidget())
return 0;
return subframeForTargetNode(targetNode(hitTestResult));
}
Frame* EventHandler::subframeForTargetNode(Node* node)
{
if (!node)
return 0;
RenderObject* renderer = node->renderer();
if (!renderer || !renderer->isWidget())
return 0;
Widget* widget = toRenderWidget(renderer)->widget();
if (!widget || !widget->isFrameView())
return 0;
return static_cast<FrameView*>(widget)->frame();
}
static bool isSubmitImage(Node* node)
{
return node && node->hasTagName(inputTag) && static_cast<HTMLInputElement*>(node)->isImageButton();
}
// Returns true if the node's editable block is not current focused for editing
static bool nodeIsNotBeingEdited(Node* node, Frame* frame)
{
return frame->selection()->rootEditableElement() != node->rootEditableElement();
}
Cursor EventHandler::selectCursor(const MouseEventWithHitTestResults& event, Scrollbar* scrollbar)
{
Node* node = targetNode(event);
RenderObject* renderer = node ? node->renderer() : 0;
RenderStyle* style = renderer ? renderer->style() : 0;
bool horizontalText = !style || style->isHorizontalWritingMode();
const Cursor& iBeam = horizontalText ? iBeamCursor() : verticalTextCursor();
// During selection, use an I-beam no matter what we're over.
// If you're capturing mouse events for a particular node, don't treat this as a selection.
if (m_mousePressed && m_mouseDownMayStartSelect && m_frame->selection()->isCaretOrRange() && !m_capturingMouseEventsNode)
return iBeam;
if (renderer && renderer->isFrameSet()) {
RenderFrameSet* frameSetRenderer = toRenderFrameSet(renderer);
if (frameSetRenderer->canResizeRow(event.localPoint()))
return rowResizeCursor();
if (frameSetRenderer->canResizeColumn(event.localPoint()))
return columnResizeCursor();
}
if (style && style->cursors()) {
const CursorList* cursors = style->cursors();
for (unsigned i = 0; i < cursors->size(); ++i) {
const CachedImage* cimage = 0;
StyleImage* image = (*cursors)[i].image();
if (image && image->isCachedImage())
cimage = static_cast<StyleCachedImage*>(image)->cachedImage();
if (!cimage)
continue;
IntPoint hotSpot = (*cursors)[i].hotSpot();
// Limit the size of cursors so that they cannot be used to cover UI elements in chrome.
IntSize size = cimage->image()->size();
if (size.width() > 128 || size.height() > 128)
continue;
if (cimage->image()->isNull())
break;
if (!cimage->errorOccurred())
return Cursor(cimage->image(), hotSpot);
}
}
switch (style ? style->cursor() : CURSOR_AUTO) {
case CURSOR_AUTO: {
bool editable = (node && 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) {
ASSERT(m_frame->settings());
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) || event.event().shiftKey();
break;
case EditableLinkOnlyLiveWithShiftKey:
editableLinkEnabled = event.event().shiftKey();
break;
}
}
if ((event.isOverLink() || isSubmitImage(node)) && (!editable || editableLinkEnabled))
return handCursor();
bool inResizer = false;
if (renderer) {
if (RenderLayer* layer = renderer->enclosingLayer()) {
if (FrameView* view = m_frame->view())
inResizer = layer->isPointInResizeControl(view->windowToContents(event.event().pos()));
}
}
if ((editable || (renderer && renderer->isText() && node->canStartSelection())) && !inResizer && !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();
}
static IntPoint 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;
}
Node* EventHandler::targetNode(const MouseEventWithHitTestResults& event)
{
return targetNode(event.hitTestResult());
}
Node* EventHandler::targetNode(const HitTestResult& hitTestResult)
{
Node* node = hitTestResult.innerNode();
if (!node)
return 0;
if (node->inDocument())
return node;
Element* element = node->parentElement();
if (element && element->inDocument())
return element;
return node;
}
bool EventHandler::handleMousePressEvent(const PlatformMouseEvent& mouseEvent)
{
RefPtr<FrameView> protector(m_frame->view());
UserGestureIndicator gestureIndicator(DefinitelyProcessingUserGesture);
cancelFakeMouseMoveEvent();
m_mousePressed = true;
m_capturesDragging = true;
m_currentMousePosition = mouseEvent.pos();
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.pos());
else {
invalidateClick();
return false;
}
m_mouseDownWasInSubframe = false;
#if ENABLE(COMPOSITED_FIXED_ELEMENTS)
// Add IgnoreClipping because fixed position elements are moved only on the
// UI thread. Nodes in fixed position elements are clipped out by the view
// without IgnoreClipping.
HitTestRequest request(HitTestRequest::Active | HitTestRequest::IgnoreClipping);
#else
HitTestRequest request(HitTestRequest::Active);
#endif
// Save the document point we generate in case the window coordinate is invalidated by what happens
// when we dispatch the event.
IntPoint documentPoint = documentPointForWindowPoint(m_frame, mouseEvent.pos());
MouseEventWithHitTestResults mev = m_frame->document()->prepareMouseEvent(request, documentPoint, mouseEvent);
if (!targetNode(mev)) {
invalidateClick();
return false;
}
m_mousePressNode = targetNode(mev);
if (InspectorInstrumentation::handleMousePress(m_frame->page())) {
invalidateClick();
return true;
}
Frame* subframe = subframeForHitTestResult(mev);
if (subframe && passMousePressEventToSubframe(mev, subframe)) {
// 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_capturingMouseEventsNode = targetNode(mev);
m_eventHandlerWillResetCapturingMouseEventsNode = true;
}
invalidateClick();
return true;
}
#if ENABLE(PAN_SCROLLING)
// We store whether pan scrolling is in progress before calling stopAutoscrollTimer()
// because it will set m_panScrollInProgress to false on return.
bool isPanScrollInProgress = m_frame->page() && m_frame->page()->mainFrame()->eventHandler()->panScrollInProgress();
if (isPanScrollInProgress || m_autoscrollInProgress)
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 = targetNode(mev);
if (FrameView* view = m_frame->view()) {
RenderLayer* layer = m_clickNode->renderer() ? m_clickNode->renderer()->enclosingLayer() : 0;
IntPoint p = view->windowToContents(mouseEvent.pos());
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, targetNode(mev), true, m_clickCount, mouseEvent, true);
m_capturesDragging = !swallowEvent;
// 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);
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 (targetNode(mev)->isShadowRoot() && targetNode(mev)->shadowHost()->hasTagName(inputTag)) {
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active);
mev = m_frame->document()->prepareMouseEvent(request, documentPoint, mouseEvent);
}
FrameView* view = m_frame->view();
Scrollbar* scrollbar = view ? view->scrollbarAtPoint(mouseEvent.pos()) : 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());
UserGestureIndicator gestureIndicator(DefinitelyProcessingUserGesture);
// We get this instead of a second mouse-up
m_mousePressed = false;
m_currentMousePosition = mouseEvent.pos();
HitTestRequest request(HitTestRequest::Active);
MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseEvent);
Frame* subframe = subframeForHitTestResult(mev);
if (m_eventHandlerWillResetCapturingMouseEventsNode)
m_capturingMouseEventsNode = 0;
if (subframe && passMousePressEventToSubframe(mev, subframe))
return true;
m_clickCount = mouseEvent.clickCount();
bool swallowMouseUpEvent = dispatchMouseEvent(eventNames().mouseupEvent, targetNode(mev), true, m_clickCount, mouseEvent, false);
bool swallowClickEvent = mouseEvent.button() != RightButton && targetNode(mev) == m_clickNode && dispatchMouseEvent(eventNames().clickEvent, targetNode(mev), true, m_clickCount, mouseEvent, true);
if (m_lastScrollbarUnderMouse)
swallowMouseUpEvent = m_lastScrollbarUnderMouse->mouseUp();
bool swallowMouseReleaseEvent = !swallowMouseUpEvent && handleMouseReleaseEvent(mev);
invalidateClick();
return swallowMouseUpEvent || swallowClickEvent || swallowMouseReleaseEvent;
}
static RenderLayer* layerForNode(Node* node)
{
if (!node)
return 0;
RenderObject* renderer = node->renderer();
if (!renderer)
return 0;
RenderLayer* layer = renderer->enclosingLayer();
if (!layer)
return 0;
return layer;
}
bool EventHandler::mouseMoved(const PlatformMouseEvent& event)
{
HitTestResult hoveredNode = HitTestResult(IntPoint());
bool result = handleMouseMoveEvent(event, &hoveredNode);
Page* page = m_frame->page();
if (!page)
return result;
if (RenderLayer* layer = layerForNode(hoveredNode.innerNode())) {
if (page->containsScrollableArea(layer))
layer->scrollAnimator()->mouseMovedInContentArea();
}
if (FrameView* frameView = m_frame->view())
frameView->scrollAnimator()->mouseMovedInContentArea();
hoveredNode.setToNonShadowAncestor();
page->chrome()->mouseDidMoveOverElement(hoveredNode, event.modifierFlags());
page->chrome()->setToolTip(hoveredNode);
return result;
}
bool EventHandler::handleMouseMoveEvent(const PlatformMouseEvent& mouseEvent, HitTestResult* hoveredNode)
{
// in Radar 3703768 we saw frequent crashes apparently due to the
// part being null here, which seems impossible, so check for nil
// but also assert so that we can try to figure this out in debug
// builds, if it happens.
ASSERT(m_frame);
if (!m_frame)
return false;
RefPtr<FrameView> protector(m_frame->view());
m_currentMousePosition = mouseEvent.pos();
if (m_hoverTimer.isActive())
m_hoverTimer.stop();
cancelFakeMouseMoveEvent();
#if ENABLE(SVG)
if (m_svgPan) {
static_cast<SVGDocument*>(m_frame->document())->updatePan(m_currentMousePosition);
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);
// Treat mouse move events while the mouse is pressed as "read-only" in prepareMouseEvent
// if we are allowed to select.
// This means that :hover and :active freeze in the state they were in when the mouse
// was pressed, rather than updating for nodes the mouse moves over as you hold the mouse down.
HitTestRequest::HitTestRequestType hitType = HitTestRequest::MouseMove;
if (m_mousePressed && m_mouseDownMayStartSelect)
hitType |= HitTestRequest::ReadOnly;
if (m_mousePressed)
hitType |= HitTestRequest::Active;
#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();
Scrollbar* scrollbar = 0;
if (m_resizeLayer && m_resizeLayer->inResizeMode())
m_resizeLayer->resize(mouseEvent, m_offsetFromResizeCorner);
else {
if (FrameView* view = m_frame->view())
scrollbar = view->scrollbarAtPoint(mouseEvent.pos());
if (!scrollbar)
scrollbar = mev.scrollbar();
updateLastScrollbarUnderMouse(scrollbar, !m_mousePressed);
}
bool swallowEvent = false;
RefPtr<Frame> newSubframe = m_capturingMouseEventsNode.get() ? subframeForTargetNode(m_capturingMouseEventsNode.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(targetNode(mev), 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 (scrollbar && !m_mousePressed)
scrollbar->mouseMoved(mouseEvent); // Handle hover effects on platforms that support visual feedback on scrollbar hovering.
if (Page* page = m_frame->page()) {
if ((!m_resizeLayer || !m_resizeLayer->inResizeMode()) && !page->mainFrame()->eventHandler()->panScrollInProgress()) {
// Plugins set cursor on their own. The only case WebKit intervenes is resetting cursor to arrow on mouse enter,
// in case the particular plugin doesn't manipulate cursor at all. Thus, even a CSS cursor set on body has no
// effect on plugins (which matches Firefox).
bool overPluginElement = false;
if (targetNode(mev) && targetNode(mev)->isHTMLElement()) {
HTMLElement* el = toHTMLElement(targetNode(mev));
overPluginElement = el->hasTagName(appletTag) || el->hasTagName(objectTag) || el->hasTagName(embedTag);
}
if (!overPluginElement) {
if (FrameView* view = m_frame->view())
view->setCursor(selectCursor(mev, scrollbar));
}
}
}
}
m_lastMouseMoveEventSubframe = newSubframe;
if (swallowEvent)
return true;
swallowEvent = dispatchMouseEvent(eventNames().mousemoveEvent, targetNode(mev), 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;
}
bool EventHandler::handleMouseReleaseEvent(const PlatformMouseEvent& mouseEvent)
{
RefPtr<FrameView> protector(m_frame->view());
UserGestureIndicator gestureIndicator(DefinitelyProcessingUserGesture);
#if ENABLE(PAN_SCROLLING)
if (mouseEvent.button() == MiddleButton)
m_panScrollButtonPressed = false;
if (m_springLoadedPanScrollInProgress)
stopAutoscrollTimer();
#endif
m_mousePressed = false;
m_currentMousePosition = mouseEvent.pos();
#if ENABLE(SVG)
if (m_svgPan) {
m_svgPan = false;
static_cast<SVGDocument*>(m_frame->document())->updatePan(m_currentMousePosition);
return true;
}
#endif
if (m_frameSetBeingResized)
return dispatchMouseEvent(eventNames().mouseupEvent, m_frameSetBeingResized.get(), true, m_clickCount, mouseEvent, false);
if (m_lastScrollbarUnderMouse) {
invalidateClick();
return m_lastScrollbarUnderMouse->mouseUp();
}
#if ENABLE(COMPOSITED_FIXED_ELEMENTS)
// Add IgnoreClipping because fixed position elements are moved only on the
// UI thread. Nodes in fixed position elements are clipped out by the view
// without IgnoreClipping.
HitTestRequest request(HitTestRequest::MouseUp | HitTestRequest::IgnoreClipping);
#else
HitTestRequest request(HitTestRequest::MouseUp);
#endif
MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseEvent);
Frame* subframe = m_capturingMouseEventsNode.get() ? subframeForTargetNode(m_capturingMouseEventsNode.get()) : subframeForHitTestResult(mev);
if (m_eventHandlerWillResetCapturingMouseEventsNode)
m_capturingMouseEventsNode = 0;
if (subframe && passMouseReleaseEventToSubframe(mev, subframe))
return true;
bool swallowMouseUpEvent = dispatchMouseEvent(eventNames().mouseupEvent, targetNode(mev), true, m_clickCount, mouseEvent, false);
bool swallowClickEvent = m_clickCount > 0 && mouseEvent.button() != RightButton && targetNode(mev) == m_clickNode && dispatchMouseEvent(eventNames().clickEvent, targetNode(mev), 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;
}
#if ENABLE(DRAG_SUPPORT)
bool EventHandler::dispatchDragEvent(const AtomicString& eventType, Node* 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, m_frame->document()->defaultView(),
0, event.globalX(), event.globalY(), event.x(), event.y(),
event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(),
0, 0, clipboard);
ExceptionCode ec;
dragTarget->dispatchEvent(me.get(), ec);
return me->defaultPrevented();
}
bool EventHandler::canHandleDragAndDropForTarget(DragAndDropHandleType type, Node* target, const PlatformMouseEvent& event, Clipboard* clipboard, bool* accepted)
{
bool canHandle = false;
bool wasAccepted = false;
if (target->hasTagName(frameTag) || target->hasTagName(iframeTag)) {
Frame* frame = static_cast<HTMLFrameElementBase*>(target)->contentFrame();
if (frame) {
switch (type) {
case UpdateDragAndDrop:
wasAccepted = frame->eventHandler()->updateDragAndDrop(event, clipboard);
break;
case CancelDragAndDrop:
frame->eventHandler()->cancelDragAndDrop(event, clipboard);
break;
case PerformDragAndDrop:
wasAccepted = frame->eventHandler()->performDragAndDrop(event, clipboard);
break;
}
}
} else
canHandle = true;
if (accepted)
*accepted = wasAccepted;
return canHandle;
}
bool EventHandler::updateDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard)
{
bool accept = false;
if (!m_frame->view())
return false;
HitTestRequest request(HitTestRequest::ReadOnly);
MouseEventWithHitTestResults mev = prepareMouseEvent(request, event);
// Drag events should never go to text nodes (following IE, and proper mouseover/out dispatch)
Node* newTarget = targetNode(mev);
if (newTarget && newTarget->isTextNode())
newTarget = newTarget->parentNode();
if (newTarget)
newTarget = newTarget->shadowAncestorNode();
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>.
if (newTarget && canHandleDragAndDropForTarget(UpdateDragAndDrop, newTarget, event, clipboard, &accept)) {
// 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().m_dragSrc && dragState().m_dragSrcMayBeDHTML) {
// 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 (m_dragTarget && canHandleDragAndDropForTarget(UpdateDragAndDrop, m_dragTarget.get(), event, clipboard, &accept))
dispatchDragEvent(eventNames().dragleaveEvent, m_dragTarget.get(), 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 {
if (newTarget && canHandleDragAndDropForTarget(UpdateDragAndDrop, newTarget, event, clipboard, &accept)) {
// 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().m_dragSrc && dragState().m_dragSrcMayBeDHTML) {
// 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);
m_shouldOnlyFireDragOverEvent = false;
}
}
m_dragTarget = newTarget;
return accept;
}
void EventHandler::cancelDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard)
{
if (m_dragTarget && canHandleDragAndDropForTarget(CancelDragAndDrop, m_dragTarget.get(), event, clipboard)) {
if (dragState().m_dragSrc && dragState().m_dragSrcMayBeDHTML)
dispatchDragSrcEvent(eventNames().dragEvent, event);
dispatchDragEvent(eventNames().dragleaveEvent, m_dragTarget.get(), event, clipboard);
}
clearDragState();
}
bool EventHandler::performDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard)
{
bool accept = false;
if (m_dragTarget && canHandleDragAndDropForTarget(PerformDragAndDrop, m_dragTarget.get(), event, clipboard, &accept))
dispatchDragEvent(eventNames().dropEvent, m_dragTarget.get(), event, clipboard);
clearDragState();
return accept;
}
void EventHandler::clearDragState()
{
m_dragTarget = 0;
m_capturingMouseEventsNode = 0;
m_shouldOnlyFireDragOverEvent = false;
#if PLATFORM(MAC)
m_sendingEventToSubview = false;
#endif
}
#endif // ENABLE(DRAG_SUPPORT)
#if PLATFORM(ANDROID) && ENABLE(TOUCH_EVENTS)
void EventHandler::setCapturingTouchEventsNode(PassRefPtr<Node> n)
{
m_capturingTouchEventsNode = n;
}
#endif
void EventHandler::setCapturingMouseEventsNode(PassRefPtr<Node> n)
{
m_capturingMouseEventsNode = n;
m_eventHandlerWillResetCapturingMouseEventsNode = false;
}
MouseEventWithHitTestResults EventHandler::prepareMouseEvent(const HitTestRequest& request, const PlatformMouseEvent& mev)
{
ASSERT(m_frame);
ASSERT(m_frame->document());
return m_frame->document()->prepareMouseEvent(request, documentPointForWindowPoint(m_frame, mev.pos()), mev);
}
#if ENABLE(SVG)
static inline SVGElementInstance* instanceAssociatedWithShadowTreeElement(Node* referenceNode)
{
if (!referenceNode || !referenceNode->isSVGElement())
return 0;
Node* shadowTreeElement = referenceNode->shadowTreeRootNode();
if (!shadowTreeElement)
return 0;
Element* shadowTreeParentElement = shadowTreeElement->shadowHost();
if (!shadowTreeParentElement)
return 0;
ASSERT(shadowTreeParentElement->hasTagName(useTag));
return static_cast<SVGUseElement*>(shadowTreeParentElement)->instanceForShadowTreeElement(referenceNode);
}
#endif
void EventHandler::updateMouseEventTargetNode(Node* targetNode, const PlatformMouseEvent& mouseEvent, bool fireMouseOverOut)
{
Node* result = targetNode;
// If we're capturing, we always go right to that node.
if (m_capturingMouseEventsNode)
result = m_capturingMouseEventsNode.get();
else {
// If the target node is a text node, dispatch on the parent node - rdar://4196646
if (result && result->isTextNode())
result = result->parentNode();
}
m_nodeUnderMouse = result;
#if ENABLE(SVG)
m_instanceUnderMouse = instanceAssociatedWithShadowTreeElement(result);
// <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_lastNodeUnderMouse == shadowTreeElement)
continue;
m_lastNodeUnderMouse = shadowTreeElement;
m_lastInstanceUnderMouse = instance;
break;
}
}
}
#endif
// Fire mouseout/mouseover if the mouse has shifted to a different node.
if (fireMouseOverOut) {
RenderLayer* layerForLastNode = layerForNode(m_lastNodeUnderMouse.get());
RenderLayer* layerForNodeUnderMouse = layerForNode(m_nodeUnderMouse.get());
Page* page = m_frame->page();
if (m_lastNodeUnderMouse && (!m_nodeUnderMouse || m_nodeUnderMouse->document() != m_frame->document())) {
// The mouse has moved between frames.
if (Frame* frame = m_lastNodeUnderMouse->document()->frame()) {
if (FrameView* frameView = frame->view())
frameView->scrollAnimator()->mouseExitedContentArea();
}
} else if (page && (layerForLastNode && (!layerForNodeUnderMouse || layerForNodeUnderMouse != layerForLastNode))) {
// The mouse has moved between layers.
if (page->containsScrollableArea(layerForLastNode))
layerForLastNode->scrollAnimator()->mouseExitedContentArea();
}
if (m_nodeUnderMouse && (!m_lastNodeUnderMouse || m_lastNodeUnderMouse->document() != m_frame->document())) {
// The mouse has moved between frames.
if (Frame* frame = m_nodeUnderMouse->document()->frame()) {
if (FrameView* frameView = frame->view())
frameView->scrollAnimator()->mouseEnteredContentArea();
}
} else if (page && (layerForNodeUnderMouse && (!layerForLastNode || layerForNodeUnderMouse != layerForLastNode))) {
// The mouse has moved between layers.
if (page->containsScrollableArea(layerForNodeUnderMouse))
layerForNodeUnderMouse->scrollAnimator()->mouseEnteredContentArea();
}
if (m_lastNodeUnderMouse && m_lastNodeUnderMouse->document() != m_frame->document()) {
m_lastNodeUnderMouse = 0;
m_lastScrollbarUnderMouse = 0;
#if ENABLE(SVG)
m_lastInstanceUnderMouse = 0;
#endif
}
if (m_lastNodeUnderMouse != m_nodeUnderMouse) {
// send mouseout event to the old node
if (m_lastNodeUnderMouse)
m_lastNodeUnderMouse->dispatchMouseEvent(mouseEvent, eventNames().mouseoutEvent, 0, m_nodeUnderMouse.get());
// send mouseover event to the new node
if (m_nodeUnderMouse)
m_nodeUnderMouse->dispatchMouseEvent(mouseEvent, eventNames().mouseoverEvent, 0, m_lastNodeUnderMouse.get());
}
m_lastNodeUnderMouse = m_nodeUnderMouse;
#if ENABLE(SVG)
m_lastInstanceUnderMouse = instanceAssociatedWithShadowTreeElement(m_nodeUnderMouse.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_nodeUnderMouse)
swallowEvent = m_nodeUnderMouse->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.pos()))
return false;
}
// 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.
Node* node = m_nodeUnderMouse.get();
// Walk up the DOM tree to search for a node to focus.
while (node) {
if (node->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.
ExceptionCode ec = 0;
Node* n = node->isShadowRoot() ? node->shadowHost() : node;
if (m_frame->selection()->isRange()
&& m_frame->selection()->toNormalizedRange()->compareNode(n, ec) == Range::NODE_INSIDE
&& n->isDescendantOf(m_frame->document()->focusedNode()))
return false;
break;
}
node = node->parentOrHostNode();
}
// 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 (node && node->isMouseFocusable()) {
if (!page->focusController()->setFocusedNode(node, m_frame))
swallowEvent = true;
} else if (!node || !node->focused()) {
if (!page->focusController()->setFocusedNode(0, m_frame))
swallowEvent = true;
}
}
}
return swallowEvent;
}
#if !PLATFORM(GTK) && !(PLATFORM(CHROMIUM) && (OS(LINUX) || OS(FREEBSD)))
bool EventHandler::shouldTurnVerticalTicksIntoHorizontal(const HitTestResult&) const
{
return false;
}
#endif
bool EventHandler::handleWheelEvent(PlatformWheelEvent& e)
{
Document* doc = m_frame->document();
RenderObject* docRenderer = doc->renderer();
if (!docRenderer)
return false;
RefPtr<FrameView> protector(m_frame->view());
FrameView* view = m_frame->view();
if (!view)
return false;
setFrameWasScrolledByUser();
IntPoint vPoint = view->windowToContents(e.pos());
Node* node;
bool isOverWidget;
HitTestRequest request(HitTestRequest::ReadOnly);
HitTestResult result(vPoint);
doc->renderView()->layer()->hitTest(request, result);
#if PLATFORM(MAC)
m_useLatchedWheelEventNode = e.momentumPhase() == PlatformWheelEventPhaseBegan || e.momentumPhase() == PlatformWheelEventPhaseChanged;
#endif
if (m_useLatchedWheelEventNode) {
if (!m_latchedWheelEventNode) {
m_latchedWheelEventNode = result.innerNode();
m_widgetIsLatched = result.isOverWidget();
}
node = m_latchedWheelEventNode.get();
isOverWidget = m_widgetIsLatched;
} else {
if (m_latchedWheelEventNode)
m_latchedWheelEventNode = 0;
if (m_previousWheelScrolledNode)
m_previousWheelScrolledNode = 0;
node = result.innerNode();
isOverWidget = result.isOverWidget();
}
if (shouldTurnVerticalTicksIntoHorizontal(result))
e.turnVerticalTicksIntoHorizontal();
if (node) {
// Figure out which view to send the event to.
RenderObject* target = node->renderer();
if (isOverWidget && target && target->isWidget()) {
Widget* widget = toRenderWidget(target)->widget();
if (widget && passWheelEventToWidget(e, widget)) {
e.accept();
return true;
}
}
node = node->shadowAncestorNode();
if (!node->dispatchWheelEvent(e)) {
e.accept();
return true;
}
}
if (e.isAccepted())
return true;
view = m_frame->view();
if (!view)
return false;
view->wheelEvent(e);
return e.isAccepted();
}
void EventHandler::defaultWheelEventHandler(Node* startNode, WheelEvent* wheelEvent)
{
if (!startNode || !wheelEvent)
return;
Node* stopNode = m_previousWheelScrolledNode.get();
// 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 (scrollNode(wheelEvent->rawDeltaX(), wheelEvent->granularity(), ScrollLeft, ScrollRight, startNode, &stopNode))
wheelEvent->setDefaultHandled();
if (scrollNode(wheelEvent->rawDeltaY(), wheelEvent->granularity(), ScrollUp, ScrollDown, startNode, &stopNode))
wheelEvent->setDefaultHandled();
if (!m_useLatchedWheelEventNode)
m_previousWheelScrolledNode = stopNode;
}
#if ENABLE(GESTURE_EVENTS)
bool EventHandler::handleGestureEvent(const PlatformGestureEvent& gestureEvent)
{
// FIXME: This should hit test and go to the correct subframe rather than
// always sending gestures to the main frame only. We should also ensure
// that if a frame gets a gesture begin gesture, it gets the corresponding
// end gesture as well.
FrameView* view = m_frame->view();
if (!view)
return false;
view->handleGestureEvent(gestureEvent);
return true;
}
#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;
bool swallowEvent;
IntPoint viewportPos = v->windowToContents(event.pos());
HitTestRequest request(HitTestRequest::Active);
MouseEventWithHitTestResults mev = doc->prepareMouseEvent(request, viewportPos, event);
if (m_frame->editor()->behavior().shouldSelectOnContextualMenuClick()
&& !m_frame->selection()->contains(viewportPos)
// FIXME: In the editable case, word selection sometimes selects content that isn't underneath the mouse.
// If the selection is non-editable, we do word selection to make it easier to use the contextual menu items
// available for text selections. But only if we're above text.
&& (m_frame->selection()->isContentEditable() || (targetNode(mev) && targetNode(mev)->isTextNode()))) {
m_mouseDownMayStartSelect = true; // context menu events are always allowed to perform a selection
selectClosestWordOrLinkFromMouseEvent(mev);
}
swallowEvent = dispatchMouseEvent(eventNames().contextmenuEvent, targetNode(mev), 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;
static const int kContextMenuMargin = 1;
#if OS(WINDOWS) && !OS(WINCE)
int rightAligned = ::GetSystemMetrics(SM_MENUDROPALIGNMENT);
#else
int rightAligned = 0;
#endif
IntPoint location;
Node* focusedNode = doc->focusedNode();
SelectionController* selectionController = m_frame->selection();
Position start = selectionController->selection().start();
if (start.deprecatedNode() && (selectionController->rootEditableElement() || selectionController->isRange())) {
RefPtr<Range> selection = selectionController->toNormalizedRange();
IntRect firstRect = m_frame->editor()->firstRectForRange(selection.get());
int x = rightAligned ? firstRect.maxX() : firstRect.x();
location = IntPoint(x, firstRect.maxY());
} else if (focusedNode) {
RenderBoxModelObject* box = focusedNode->renderBoxModelObject();
if (!box)
return false;
IntRect clippedRect = box->absoluteClippedOverflowRect();
location = IntPoint(clippedRect.x(), clippedRect.maxY() - 1);
} else {
location = IntPoint(
rightAligned ? view->contentsWidth() - kContextMenuMargin : kContextMenuMargin,
kContextMenuMargin);
}
m_frame->view()->setCursor(pointerCursor());
IntPoint position = view->contentsToWindow(location);
IntPoint globalPosition = view->contentsToScreen(IntRect(location, IntSize())).location();
Node* targetNode = doc->focusedNode();
if (!targetNode)
targetNode = doc;
// Use the focused node as the target for hover and active.
HitTestResult result(position);
result.setInnerNode(targetNode);
HitTestRequest request(HitTestRequest::Active);
doc->renderView()->layer()->updateHoverActiveState(request, result);
doc->updateStyleIfNeeded();
// The contextmenu event is a mouse event even when invoked using the keyboard.
// This is required for web compatibility.
#if OS(WINDOWS)
MouseEventType eventType = MouseEventReleased;
#else
MouseEventType eventType = MouseEventPressed;
#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::dispatchFakeMouseMoveEventSoon()
{
if (m_mousePressed)
return;
if (!m_fakeMouseMoveEventTimer.isActive())
m_fakeMouseMoveEventTimer.startOneShot(fakeMouseMoveInterval);
}
void EventHandler::dispatchFakeMouseMoveEventSoonInQuad(const FloatQuad& quad)
{
FrameView* view = m_frame->view();
if (!view)
return;
if (m_mousePressed || !quad.containsPoint(view->windowToContents(m_currentMousePosition)))
return;
if (!m_fakeMouseMoveEventTimer.isActive())
m_fakeMouseMoveEventTimer.startOneShot(fakeMouseMoveInterval);
}
void EventHandler::cancelFakeMouseMoveEvent()
{
m_fakeMouseMoveEventTimer.stop();
}
void EventHandler::fakeMouseMoveEventTimerFired(Timer<EventHandler>* timer)
{
ASSERT_UNUSED(timer, timer == &m_fakeMouseMoveEventTimer);
ASSERT(!m_mousePressed);
FrameView* view = m_frame->view();
if (!view)
return;
bool shiftKey;
bool ctrlKey;
bool altKey;
bool metaKey;
PlatformKeyboardEvent::getCurrentModifierState(shiftKey, ctrlKey, altKey, metaKey);
IntPoint globalPoint = view->contentsToScreen(IntRect(view->windowToContents(m_currentMousePosition), IntSize())).location();
PlatformMouseEvent fakeMouseMoveEvent(m_currentMousePosition, globalPoint, NoButton, MouseEventMoved, 0, shiftKey, ctrlKey, altKey, metaKey, currentTime());
mouseMoved(fakeMouseMoveEvent);
}
// Whether or not a mouse down can begin the creation of a selection. Fires the selectStart event.
bool EventHandler::canMouseDownStartSelect(Node* node)
{
if (!node || !node->renderer())
return true;
// Some controls and images can't start a select on a mouse down.
if (!node->canStartSelection())
return false;
return node->dispatchEvent(Event::create(eventNames().selectstartEvent, true, true));
}
#if ENABLE(DRAG_SUPPORT)
bool EventHandler::canMouseDragExtendSelect(Node* node)
{
if (!node || !node->renderer())
return true;
return node->dispatchEvent(Event::create(eventNames().selectstartEvent, true, true));
}
#endif // ENABLE(DRAG_SUPPORT)
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);
ASSERT(m_frame->document());
if (RenderView* renderer = m_frame->contentRenderer()) {
if (FrameView* view = m_frame->view()) {
HitTestRequest request(HitTestRequest::MouseMove);
HitTestResult result(view->windowToContents(m_currentMousePosition));
renderer->layer()->hitTest(request, result);
m_frame->document()->updateStyleIfNeeded();
}
}
}
static Node* eventTargetNodeForDocument(Document* doc)
{
if (!doc)
return 0;
Node* node = doc->focusedNode();
if (!node && doc->isPluginDocument()) {
PluginDocument* pluginDocument = static_cast<PluginDocument*>(doc);
node = pluginDocument->pluginNode();
}
if (!node && doc->isHTMLDocument())
node = doc->body();
if (!node)
node = doc->documentElement();
return node;
}
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() & PlatformKeyboardEvent::ShiftKey));
if ((evt.modifiers() & ~PlatformKeyboardEvent::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
bool EventHandler::keyEvent(const PlatformKeyboardEvent& initialKeyEvent)
{
RefPtr<FrameView> protector(m_frame->view());
if (initialKeyEvent.windowsVirtualKeyCode() == VK_CAPITAL)
capsLockStateMayHaveChanged();
#if ENABLE(PAN_SCROLLING)
if (Page* page = m_frame->page()) {
if (page->mainFrame()->eventHandler()->panScrollInProgress() || m_autoscrollInProgress) {
// If a key is pressed while the autoscroll/panScroll is in progress then we want to stop
if (initialKeyEvent.type() == PlatformKeyboardEvent::KeyDown || initialKeyEvent.type() == PlatformKeyboardEvent::RawKeyDown)
stopAutoscrollTimer();
// If we were in autoscroll/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<Node> node = eventTargetNodeForDocument(m_frame->document());
if (!node)
return false;
UserGestureIndicator gestureIndicator(DefinitelyProcessingUserGesture);
UserTypingGestureIndicator typingGestureIndicator(m_frame);
if (FrameView* view = m_frame->view())
view->resetDeferredRepaintDelay();
// FIXME: what is this doing here, in keyboard event handler?
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() == PlatformKeyboardEvent::KeyDown)
matchedAnAccessKey = handleAccessKey(initialKeyEvent);
// FIXME: it would be fair to let an input method handle KeyUp events before DOM dispatch.
if (initialKeyEvent.type() == PlatformKeyboardEvent::KeyUp || initialKeyEvent.type() == PlatformKeyboardEvent::Char)
return !node->dispatchKeyEvent(initialKeyEvent);
bool backwardCompatibilityMode = needsKeyboardEventDisambiguationQuirks();
ExceptionCode ec;
PlatformKeyboardEvent keyDownEvent = initialKeyEvent;
if (keyDownEvent.type() != PlatformKeyboardEvent::RawKeyDown)
keyDownEvent.disambiguateKeyDownEvent(PlatformKeyboardEvent::RawKeyDown, backwardCompatibilityMode);
RefPtr<KeyboardEvent> keydown = KeyboardEvent::create(keyDownEvent, m_frame->document()->defaultView());
if (matchedAnAccessKey)
keydown->setDefaultPrevented(true);
keydown->setTarget(node);
if (initialKeyEvent.type() == PlatformKeyboardEvent::RawKeyDown) {
node->dispatchEvent(keydown, ec);
// 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(node);
keydown->setDefaultHandled();
}
node->dispatchEvent(keydown, ec);
// 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 node.
// But if we are dispatching a fake backward compatibility keypress, then we pretend that the keypress happened on the original node.
if (!keydownResult) {
node = eventTargetNodeForDocument(m_frame->document());
if (!node)
return false;
}
PlatformKeyboardEvent keyPressEvent = initialKeyEvent;
keyPressEvent.disambiguateKeyDownEvent(PlatformKeyboardEvent::Char, backwardCompatibilityMode);
if (keyPressEvent.text().isEmpty())
return keydownResult;
RefPtr<KeyboardEvent> keypress = KeyboardEvent::create(keyPressEvent, m_frame->document()->defaultView());
keypress->setTarget(node);
if (keydownResult)
keypress->setDefaultPrevented(true);
#if PLATFORM(MAC)
keypress->keypressCommands() = keydown->keypressCommands();
#endif
node->dispatchEvent(keypress, ec);
return keydownResult || keypress->defaultPrevented() || keypress->defaultHandled();
}
void EventHandler::handleKeyboardSelectionMovement(KeyboardEvent* event)
{
if (!event)
return;
const String& key = event->keyIdentifier();
bool isShifted = event->getModifierState("Shift");
bool isOptioned = event->getModifierState("Alt");
bool isCommanded = event->getModifierState("Meta");
if (key == "Up") {
m_frame->selection()->modify((isShifted) ? SelectionController::AlterationExtend : SelectionController::AlterationMove, DirectionBackward, (isCommanded) ? DocumentBoundary : LineGranularity, true);
event->setDefaultHandled();
} else if (key == "Down") {
m_frame->selection()->modify((isShifted) ? SelectionController::AlterationExtend : SelectionController::AlterationMove, DirectionForward, (isCommanded) ? DocumentBoundary : LineGranularity, true);
event->setDefaultHandled();
} else if (key == "Left") {
m_frame->selection()->modify((isShifted) ? SelectionController::AlterationExtend : SelectionController::AlterationMove, DirectionLeft, (isCommanded) ? LineBoundary : (isOptioned) ? WordGranularity : CharacterGranularity, true);
event->setDefaultHandled();
} else if (key == "Right") {
m_frame->selection()->modify((isShifted) ? SelectionController::AlterationExtend : SelectionController::AlterationMove, DirectionRight, (isCommanded) ? LineBoundary : (isOptioned) ? WordGranularity : CharacterGranularity, true);
event->setDefaultHandled();
}
}
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);
}
// provides KB navigation and selection for enhanced accessibility users
if (AXObjectCache::accessibilityEnhancedUserInterfaceEnabled())
handleKeyboardSelectionMovement(event);
}
if (event->type() == eventNames().keypressEvent) {
m_frame->editor()->handleKeyboardEvent(event);
if (event->defaultHandled())
return;
if (event->charCode() == ' ')
defaultSpaceEventHandler(event);
}
}
FocusDirection EventHandler::focusDirectionForKey(const AtomicString& keyIdentifier) const
{
DEFINE_STATIC_LOCAL(AtomicString, Down, ("Down"));
DEFINE_STATIC_LOCAL(AtomicString, Up, ("Up"));
DEFINE_STATIC_LOCAL(AtomicString, Left, ("Left"));
DEFINE_STATIC_LOCAL(AtomicString, Right, ("Right"));
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;
}
#if ENABLE(DRAG_SUPPORT)
bool EventHandler::dragHysteresisExceeded(const FloatPoint& floatDragViewportLocation) const
{
IntPoint dragViewportLocation((int)floatDragViewportLocation.x(), (int)floatDragViewportLocation.y());
return dragHysteresisExceeded(dragViewportLocation);
}
bool EventHandler::dragHysteresisExceeded(const IntPoint& dragViewportLocation) const
{
FrameView* view = m_frame->view();
if (!view)
return false;
IntPoint dragLocation = view->windowToContents(dragViewportLocation);
IntSize delta = dragLocation - m_mouseDownPos;
int threshold = GeneralDragHysteresis;
if (dragState().m_dragSrcIsImage)
threshold = ImageDragHysteresis;
else if (dragState().m_dragSrcIsLink)
threshold = LinkDragHysteresis;
else if (dragState().m_dragSrcInSelection)
threshold = TextDragHysteresis;
return abs(delta.width()) >= threshold || abs(delta.height()) >= threshold;
}
void EventHandler::freeClipboard()
{
if (dragState().m_dragClipboard)
dragState().m_dragClipboard->setAccessPolicy(ClipboardNumb);
}
bool EventHandler::shouldDragAutoNode(Node* node, const IntPoint& point) const
{
if (!node || !m_frame->view())
return false;
Page* page = m_frame->page();
return page && page->dragController()->mayStartDragAtEventLocation(m_frame, point, node);
}
void EventHandler::dragSourceEndedAt(const PlatformMouseEvent& event, DragOperation operation)
{
if (dragState().m_dragSrc && dragState().m_dragSrcMayBeDHTML) {
dragState().m_dragClipboard->setDestinationOperation(operation);
// for now we don't care if event handler cancels default behavior, since there is none
dispatchDragSrcEvent(eventNames().dragendEvent, event);
}
freeClipboard();
dragState().m_dragSrc = 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;
}
// returns if we should continue "default processing", i.e., whether eventhandler canceled
bool EventHandler::dispatchDragSrcEvent(const AtomicString& eventType, const PlatformMouseEvent& event)
{
return !dispatchDragEvent(eventType, dragState().m_dragSrc.get(), event, dragState().m_dragClipboard.get());
}
bool EventHandler::handleDrag(const MouseEventWithHitTestResults& event)
{
if (event.event().button() != LeftButton || event.event().eventType() != MouseEventMoved) {
// 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().m_dragSrc) {
allowDHTMLDrag(dragState().m_dragSrcMayBeDHTML, dragState().m_dragSrcMayBeUA);
if (!dragState().m_dragSrcMayBeDHTML && !dragState().m_dragSrcMayBeUA)
m_mouseDownMayStartDrag = false; // no element is draggable
}
if (m_mouseDownMayStartDrag && !dragState().m_dragSrc) {
// try to find an element that wants to be dragged
HitTestRequest request(HitTestRequest::ReadOnly);
HitTestResult result(m_mouseDownPos);
m_frame->contentRenderer()->layer()->hitTest(request, result);
Node* node = result.innerNode();
if (node && node->renderer())
dragState().m_dragSrc = node->renderer()->draggableNode(dragState().m_dragSrcMayBeDHTML, dragState().m_dragSrcMayBeUA,
m_mouseDownPos.x(), m_mouseDownPos.y(), dragState().m_dragSrcIsDHTML);
else
dragState().m_dragSrc = 0;
if (!dragState().m_dragSrc)
m_mouseDownMayStartDrag = false; // no element is draggable
else {
// remember some facts about this source, while we have a HitTestResult handy
node = result.URLElement();
dragState().m_dragSrcIsLink = node && node->isLink();
node = result.innerNonSharedNode();
dragState().m_dragSrcIsImage = node && node->renderer() && node->renderer()->isImage();
dragState().m_dragSrcInSelection = m_frame->selection()->contains(m_mouseDownPos);
}
}
// 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 && !dragState().m_dragSrcIsImage && dragState().m_dragSrcInSelection && event.event().timestamp() - m_mouseDownTimestamp < TextDragDelay) {
m_mouseDownMayStartDrag = false;
dragState().m_dragSrc = 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;
}
if (!m_mouseDownMayStartDrag)
return !mouseDownMayStartSelect() && !m_mouseDownMayStartAutoscroll;
// 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 (!dragHysteresisExceeded(event.event().pos()))
return true;
// Once we're past the hysteresis point, we don't want to treat this gesture as a click
invalidateClick();
DragOperation srcOp = DragOperationNone;
freeClipboard(); // would only happen if we missed a dragEnd. Do it anyway, just
// to make sure it gets numbified
dragState().m_dragClipboard = createDraggingClipboard();
if (dragState().m_dragSrcMayBeDHTML) {
// Check to see if the is a DOM based drag, if it is get the DOM specified drag
// image and offset
if (dragState().m_dragSrcIsDHTML) {
if (RenderObject* renderer = dragState().m_dragSrc->renderer()) {
// FIXME: This doesn't work correctly with transforms.
FloatPoint absPos = renderer->localToAbsolute();
IntSize delta = m_mouseDownPos - roundedIntPoint(absPos);
dragState().m_dragClipboard->setDragImageElement(dragState().m_dragSrc.get(), toPoint(delta));
} 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().m_dragClipboard->setAccessPolicy(ClipboardImageWritable);
if (m_mouseDownMayStartDrag) {
// gather values from DHTML element, if it set any
srcOp = dragState().m_dragClipboard->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().m_dragClipboard->setDragHasStarted();
}
}
if (m_mouseDownMayStartDrag) {
Page* page = m_frame->page();
DragController* dragController = page ? page->dragController() : 0;
bool startedDrag = dragController && dragController->startDrag(m_frame, dragState().m_dragClipboard.get(), srcOp, event.event(), m_mouseDownPos, dragState().m_dragSrcIsDHTML);
if (!startedDrag && dragState().m_dragSrcMayBeDHTML) {
// Drag was canned at the last minute - we owe m_dragSrc a DRAGEND event
dispatchDragSrcEvent(eventNames().dragendEvent, event.event());
m_mouseDownMayStartDrag = false;
}
}
cleanupDrag:
if (!m_mouseDownMayStartDrag) {
// something failed to start the drag, cleanup
freeClipboard();
dragState().m_dragSrc = 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);
if (!m_frame)
return false;
EventTarget* target;
if (underlyingEvent)
target = underlyingEvent->target();
else
target = eventTargetNodeForDocument(m_frame->document());
if (!target)
return false;
if (FrameView* view = m_frame->view())
view->resetDeferredRepaintDelay();
RefPtr<TextEvent> event = TextEvent::create(m_frame->domWindow(), text, inputType);
event->setUnderlyingEvent(underlyingEvent);
ExceptionCode ec;
target->dispatchEvent(event, ec);
return event->defaultHandled();
}
bool EventHandler::isKeyboardOptionTab(KeyboardEvent* event)
{
return event
&& (event->type() == eventNames().keydownEvent || event->type() == eventNames().keypressEvent)
&& event->altKey()
&& event->keyIdentifier() == "U+0009";
}
static bool eventInvertsTabsToLinksClientCallResult(KeyboardEvent* event)
{
#if PLATFORM(MAC) || PLATFORM(QT) || PLATFORM(HAIKU) || 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();
}
#if PLATFORM(QT) || PLATFORM(ANDROID)
// Qt handles the space event in platform-specific WebKit code.
// Eventually it would be good to eliminate that and use the code here instead.
void EventHandler::defaultSpaceEventHandler(KeyboardEvent*)
{
}
#else
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();
}
#endif
void EventHandler::defaultBackspaceEventHandler(KeyboardEvent* event)
{
ASSERT(event->type() == eventNames().keydownEvent);
if (event->ctrlKey() || event->metaKey() || event->altKey() || event->altGraphKey())
return;
Page* page = m_frame->page();
if (!page)
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 (Node* node = d->focusedNode()) {
if (RenderObject* r = node->renderer()) {
if (r->isTextField())
toRenderTextControlSingleLine(r)->capsLockStateMayHaveChanged();
}
}
}
void EventHandler::sendResizeEvent()
{
m_frame->document()->enqueueWindowEvent(Event::create(eventNames().resizeEvent, false, false));
}
void EventHandler::sendScrollEvent()
{
setFrameWasScrolledByUser();
if (m_frame->view() && m_frame->document())
m_frame->document()->eventQueue()->enqueueOrDispatchScrollEvent(m_frame->document(), EventQueue::ScrollEventDocumentTarget);
}
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();
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;
default:
ASSERT_NOT_REACHED();
return emptyAtom;
}
}
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);
for (unsigned i = 0; i < points.size(); ++i) {
const PlatformTouchPoint& point = points[i];
PlatformTouchPoint::State pointState = point.state();
IntPoint pagePoint = documentPointForWindowPoint(m_frame, point.pos());
HitTestRequest::HitTestRequestType hitType = HitTestRequest::Active | HitTestRequest::ReadOnly;
// 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::MouseMove | HitTestRequest::ReadOnly;
break;
case PlatformTouchPoint::TouchReleased:
case PlatformTouchPoint::TouchCancelled:
hitType = HitTestRequest::MouseUp;
break;
default:
break;
}
#if PLATFORM(ANDROID)
Node* node = 0;
if (m_capturingTouchEventsNode)
node = m_capturingTouchEventsNode.get();
else {
HitTestResult result = hitTestResultAtPoint(pagePoint, /*allowShadowContent*/ false, false, DontHitTestScrollbars, hitType);
node = result.innerNode();
ASSERT(node);
// Touch events should not go to text nodes
if (node->isTextNode())
node = node->parentNode();
}
#else
HitTestResult result = hitTestResultAtPoint(pagePoint, /*allowShadowContent*/ false, false, DontHitTestScrollbars, hitType);
Node* node = result.innerNode();
ASSERT(node);
// Touch events should not go to text nodes
if (node->isTextNode())
node = node->parentNode();
#endif
Document* doc = node->document();
if (!doc)
continue;
if (!doc->hasListenerType(Document::TOUCH_LISTENER))
continue;
if (m_frame != doc->frame()) {
// pagePoint should always be relative to the target elements containing frame.
pagePoint = documentPointForWindowPoint(doc->frame(), point.pos());
}
int adjustedPageX = lroundf(pagePoint.x() / m_frame->pageZoomFactor());
int adjustedPageY = lroundf(pagePoint.y() / m_frame->pageZoomFactor());
// 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 PLATFORM(ANDROID)
if (m_capturingTouchEventsNode)
touchTarget = node;
else {
#endif
if (pointState == PlatformTouchPoint::TouchPressed) {
m_originatingTouchPointTargets.set(touchPointTargetKey, node);
touchTarget = node;
} else if (pointState == PlatformTouchPoint::TouchReleased || pointState == PlatformTouchPoint::TouchCancelled) {
// 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
touchTarget = m_originatingTouchPointTargets.get(touchPointTargetKey);
#if PLATFORM(ANDROID)
}
#endif
if (!touchTarget.get())
continue;
RefPtr<Touch> touch = Touch::create(doc->frame(), touchTarget.get(), point.id(),
point.screenPos().x(), point.screenPos().y(),
adjustedPageX, adjustedPageY);
// 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()).first;
// 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->second->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;
// Now iterate the changedTouches list and m_targets within it, sending events to the tagets as required.
bool defaultPrevented = 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());
ExceptionCode ec = 0;
touchEventTarget->dispatchEvent(touchEvent.get(), ec);
defaultPrevented |= touchEvent->defaultPrevented();
#if PLATFORM(ANDROID)
if (touchEvent->hitTouchHandler())
const_cast<PlatformTouchEvent&>(event).setHitTouchHandler();
#endif
}
}
#if ENABLE(GESTURE_RECOGNIZER)
if (m_gestureRecognizer)
m_gestureRecognizer->processTouchEventForGesture(event, this, defaultPrevented);
#endif
return defaultPrevented;
}
#endif
}