/*
* Copyright (C) 2006, 2007, 2008, 2009 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 "ChromeClient.h"
#include "Cursor.h"
#include "Document.h"
#include "DragController.h"
#include "Editor.h"
#include "EventNames.h"
#include "FloatPoint.h"
#include "FloatRect.h"
#include "FocusController.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameTree.h"
#include "FrameView.h"
#include "HitTestRequest.h"
#include "HitTestResult.h"
#include "HTMLFrameSetElement.h"
#include "HTMLFrameElementBase.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "Image.h"
#include "InspectorController.h"
#include "KeyboardEvent.h"
#include "MouseEvent.h"
#include "MouseEventWithHitTestResults.h"
#include "Page.h"
#include "PlatformKeyboardEvent.h"
#include "PlatformWheelEvent.h"
#include "RenderFrameSet.h"
#include "RenderWidget.h"
#include "RenderView.h"
#include "Scrollbar.h"
#include "SelectionController.h"
#include "Settings.h"
#include "TextEvent.h"
#include <wtf/StdLibExtras.h>
#if ENABLE(SVG)
#include "SVGDocument.h"
#include "SVGElementInstance.h"
#include "SVGNames.h"
#include "SVGUseElement.h"
#endif
#if ENABLE(TOUCH_EVENTS) // Android
#include "TouchEvent.h"
#include "PlatformTouchEvent.h"
#endif
namespace WebCore {
using namespace HTMLNames;
// 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;
// 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;
static Frame* subframeForTargetNode(Node*);
static Frame* subframeForHitTestResult(const MouseEventWithHitTestResults&);
static inline void scrollAndAcceptEvent(float delta, ScrollDirection positiveDirection, ScrollDirection negativeDirection, PlatformWheelEvent& e, Node* node)
{
if (!delta)
return;
// Find the nearest enclosing box.
RenderBox* enclosingBox = node->renderer()->enclosingBox();
if (e.granularity() == ScrollByPageWheelEvent) {
if (enclosingBox->scroll(delta < 0 ? negativeDirection : positiveDirection, ScrollByPage, 1))
e.accept();
return;
}
float pixelsToScroll = delta > 0 ? delta : -delta;
if (e.granularity() == ScrollByLineWheelEvent)
pixelsToScroll *= cMouseWheelPixelsPerLineStep;
if (enclosingBox->scroll(delta < 0 ? negativeDirection : positiveDirection, ScrollByPixel, pixelsToScroll))
e.accept();
}
EventHandler::EventHandler(Frame* frame)
: m_frame(frame)
, m_mousePressed(false)
, m_mouseDownMayStartSelect(false)
, m_mouseDownMayStartDrag(false)
, m_mouseDownWasSingleClickInSelection(false)
, m_beganSelectingText(false)
, m_panScrollInProgress(false)
, m_hoverTimer(this, &EventHandler::hoverTimerFired)
, m_autoscrollTimer(this, &EventHandler::autoscrollTimerFired)
, m_autoscrollRenderer(0)
, m_autoscrollInProgress(false)
, m_mouseDownMayStartAutoscroll(false)
, m_mouseDownWasInSubframe(false)
#if ENABLE(SVG)
, m_svgPan(false)
#endif
, m_resizeLayer(0)
, m_capturingMouseEventsNode(0)
, m_clickCount(0)
, m_mouseDownTimestamp(0)
, m_pendingFrameUnloadEventCount(0)
, m_pendingFrameBeforeUnloadEventCount(0)
#if PLATFORM(MAC)
, m_mouseDownView(nil)
, m_sendingEventToSubview(false)
, m_activationEventNumber(0)
#endif
{
}
EventHandler::~EventHandler()
{
}
EventHandler::EventHandlerDragState& EventHandler::dragState()
{
DEFINE_STATIC_LOCAL(EventHandlerDragState, state, ());
return state;
}
void EventHandler::clear()
{
m_hoverTimer.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;
#if ENABLE(TOUCH_EVENTS) // Android
m_touch = 0;
#endif
m_frameSetBeingResized = 0;
m_dragTarget = 0;
m_currentMousePosition = IntPoint();
m_mousePressNode = 0;
m_mousePressed = false;
m_capturingMouseEventsNode = 0;
}
void EventHandler::selectClosestWordFromMouseEvent(const MouseEventWithHitTestResults& result)
{
Node* innerNode = result.targetNode();
Selection newSelection;
if (innerNode && innerNode->renderer() && m_mouseDownMayStartSelect) {
VisiblePosition pos(innerNode->renderer()->positionForPoint(result.localPoint()));
if (pos.isNotNull()) {
newSelection = Selection(pos);
newSelection.expandUsingGranularity(WordGranularity);
}
if (newSelection.isRange()) {
m_frame->setSelectionGranularity(WordGranularity);
m_beganSelectingText = true;
if (result.event().clickCount() == 2 && m_frame->editor()->isSelectTrailingWhitespaceEnabled())
newSelection.appendTrailingWhitespace();
}
if (m_frame->shouldChangeSelection(newSelection))
m_frame->selection()->setSelection(newSelection);
}
}
void EventHandler::selectClosestWordOrLinkFromMouseEvent(const MouseEventWithHitTestResults& result)
{
if (!result.hitTestResult().isLiveLink())
return selectClosestWordFromMouseEvent(result);
Node* innerNode = result.targetNode();
if (innerNode && innerNode->renderer() && m_mouseDownMayStartSelect) {
Selection newSelection;
Element* URLElement = result.hitTestResult().URLElement();
VisiblePosition pos(innerNode->renderer()->positionForPoint(result.localPoint()));
if (pos.isNotNull() && pos.deepEquivalent().node()->isDescendantOf(URLElement))
newSelection = Selection::selectionFromContentsOfNode(URLElement);
if (newSelection.isRange()) {
m_frame->setSelectionGranularity(WordGranularity);
m_beganSelectingText = true;
}
if (m_frame->shouldChangeSelection(newSelection))
m_frame->selection()->setSelection(newSelection);
}
}
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 = event.targetNode();
if (!(innerNode && innerNode->renderer() && m_mouseDownMayStartSelect))
return false;
Selection newSelection;
VisiblePosition pos(innerNode->renderer()->positionForPoint(event.localPoint()));
if (pos.isNotNull()) {
newSelection = Selection(pos);
newSelection.expandUsingGranularity(ParagraphGranularity);
}
if (newSelection.isRange()) {
m_frame->setSelectionGranularity(ParagraphGranularity);
m_beganSelectingText = true;
}
if (m_frame->shouldChangeSelection(newSelection))
m_frame->selection()->setSelection(newSelection);
return true;
}
bool EventHandler::handleMousePressEventSingleClick(const MouseEventWithHitTestResults& event)
{
if (event.event().button() != LeftButton)
return false;
Node* innerNode = event.targetNode();
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.
IntPoint vPoint = m_frame->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(innerNode, 0, DOWNSTREAM);
Position pos = visiblePos.deepEquivalent();
Selection newSelection = m_frame->selection()->selection();
if (extendSelection && newSelection.isCaretOrRange()) {
m_frame->selection()->setLastChangeWasHorizontalExtension(false);
// See <rdar://problem/3668157> REGRESSION (Mail): shift-click deselects when selection
// was created right-to-left
Position start = newSelection.start();
Position end = newSelection.end();
short before = Range::compareBoundaryPoints(pos.node(), pos.offset(), start.node(), start.offset());
if (before <= 0)
newSelection = Selection(pos, end);
else
newSelection = Selection(start, pos);
if (m_frame->selectionGranularity() != CharacterGranularity)
newSelection.expandUsingGranularity(m_frame->selectionGranularity());
m_beganSelectingText = true;
} else {
newSelection = Selection(visiblePos);
m_frame->setSelectionGranularity(CharacterGranularity);
}
if (m_frame->shouldChangeSelection(newSelection))
m_frame->selection()->setSelection(newSelection);
return true;
}
bool EventHandler::handleMousePressEvent(const MouseEventWithHitTestResults& event)
{
// Reset drag state.
dragState().m_dragSrc = 0;
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(event.targetNode());
// Careful that the drag starting logic stays in sync with eventMayStartDrag()
m_mouseDownMayStartDrag = singleClick;
m_mouseDownWasSingleClickInSelection = false;
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 = event.targetNode();
m_mousePressNode = innerNode;
m_dragStartPos = event.event().pos();
bool swallowEvent = false;
if (event.event().button() == LeftButton || event.event().button() == MiddleButton) {
m_frame->selection()->setCaretBlinkingSuspended(true);
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;
}
bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& event)
{
if (handleDrag(event))
return true;
if (!m_mousePressed)
return false;
Node* targetNode = event.targetNode();
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) {
// If the selection is contained in a layer that can scroll, that layer should handle the autoscroll
// Otherwise, let the bridge handle it so the view can scroll itself.
RenderObject* renderer = targetNode->renderer();
while (renderer && (!renderer->isBox() || !toRenderBox(renderer)->canBeProgramaticallyScrolled(false))) {
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;
}
updateSelectionForMouseDrag(targetNode, event.localPoint());
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()
|| event.button() != LeftButton || event.clickCount() != 1)
return false;
bool DHTMLFlag;
bool UAFlag;
allowDHTMLDrag(DHTMLFlag, UAFlag);
if (!DHTMLFlag && !UAFlag)
return false;
HitTestRequest request(true, false);
HitTestResult result(m_frame->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;
HitTestResult result(view->windowToContents(m_currentMousePosition));
layer->hitTest(HitTestRequest(true, true, true), result);
updateSelectionForMouseDrag(result.innerNode(), result.localPoint());
}
void EventHandler::updateSelectionForMouseDrag(Node* targetNode, const IntPoint& localPoint)
{
if (!m_mouseDownMayStartSelect)
return;
if (!targetNode)
return;
RenderObject* targetRenderer = targetNode->renderer();
if (!targetRenderer)
return;
if (!canMouseDragExtendSelect(targetNode))
return;
VisiblePosition targetPosition(targetRenderer->positionForPoint(localPoint));
// 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.
Selection 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().node())
if (RenderObject* selectionBaseRenderer = selectionBaseNode->renderer())
if (selectionBaseRenderer->isSVGText())
if (targetNode->renderer()->containingBlock() != selectionBaseRenderer->containingBlock())
return;
#endif
if (!m_beganSelectingText) {
m_beganSelectingText = true;
newSelection = Selection(targetPosition);
}
newSelection.setExtent(targetPosition);
if (m_frame->selectionGranularity() != CharacterGranularity)
newSelection.expandUsingGranularity(m_frame->selectionGranularity());
if (m_frame->shouldChangeSelection(newSelection)) {
m_frame->selection()->setLastChangeWasHorizontalExtension(false);
m_frame->selection()->setSelection(newSelection);
}
}
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_mouseDownMayStartDrag = false;
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.
// 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
&& m_dragStartPos == event.event().pos()
&& m_frame->selection()->isRange()) {
Selection newSelection;
Node *node = event.targetNode();
if (node && node->isContentEditable() && node->renderer()) {
VisiblePosition pos = node->renderer()->positionForPoint(event.localPoint());
newSelection = Selection(pos);
}
if (m_frame->shouldChangeSelection(newSelection))
m_frame->selection()->setSelection(newSelection);
handled = true;
}
m_frame->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();
m_frame->view()->addPanScrollIcon(m_panScrollStartPos);
// If we're not in the top frame we notify it that we are using the panScroll
if (m_frame != m_frame->page()->mainFrame())
m_frame->page()->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 (!m_frame->page()->mainFrame()->eventHandler()->panScrollInProgress()) {
stopAutoscrollTimer();
return;
}
#if ENABLE(PAN_SCROLLING)
setPanScrollCursor();
toRenderBox(r)->panScroll(m_panScrollStartPos);
#endif
}
}
void EventHandler::setPanScrollCursor()
{
// 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
const int noScrollRadius = 9;
bool east = m_panScrollStartPos.x() < (m_currentMousePosition.x() - noScrollRadius);
bool west = m_panScrollStartPos.x() > (m_currentMousePosition.x() + noScrollRadius);
bool north = m_panScrollStartPos.y() > (m_currentMousePosition.y() + noScrollRadius);
bool south = m_panScrollStartPos.y() < (m_currentMousePosition.y() - noScrollRadius);
if (north) {
if (east)
m_frame->view()->setCursor(northEastPanningCursor());
else if (west)
m_frame->view()->setCursor(northWestPanningCursor());
else
m_frame->view()->setCursor(northPanningCursor());
} else if (south) {
if (east)
m_frame->view()->setCursor(southEastPanningCursor());
else if (west)
m_frame->view()->setCursor(southWestPanningCursor());
else
m_frame->view()->setCursor(southPanningCursor());
} else if (east)
m_frame->view()->setCursor(eastPanningCursor());
else if (west)
m_frame->view()->setCursor(westPanningCursor());
else
m_frame->view()->setCursor(middlePanningCursor());
}
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 && (!m_autoscrollRenderer->isBox() || !toRenderBox(m_autoscrollRenderer)->canBeProgramaticallyScrolled(false)))
m_autoscrollRenderer = m_autoscrollRenderer->parent();
}
void EventHandler::setAutoscrollRenderer(RenderObject* renderer)
{
m_autoscrollRenderer = renderer;
}
void EventHandler::allowDHTMLDrag(bool& flagDHTML, bool& flagUA) const
{
if (!m_frame || !m_frame->document()) {
flagDHTML = false;
flagUA = false;
return;
}
unsigned mask = m_frame->page()->dragController()->delegateDragSourceAction(m_frame->view()->contentsToWindow(m_mouseDownPos));
flagDHTML = (mask & DragSourceActionDHTML) != DragSourceActionNone;
flagUA = ((mask & DragSourceActionImage) || (mask & DragSourceActionLink) || (mask & DragSourceActionSelection));
}
HitTestResult EventHandler::hitTestResultAtPoint(const IntPoint& point, bool allowShadowContent)
{
HitTestResult result(point);
if (!m_frame->contentRenderer())
return result;
m_frame->contentRenderer()->layer()->hitTest(HitTestRequest(true, true), result);
while (true) {
Node* n = result.innerNode();
if (!result.isOverWidget() || !n || !n->renderer() || !n->renderer()->isWidget())
break;
RenderWidget* renderWidget = static_cast<RenderWidget*>(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);
frame->contentRenderer()->layer()->hitTest(HitTestRequest(true, true), widgetHitTestResult);
result = widgetHitTestResult;
}
// 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;
Frame* mainFrame = m_frame->page()->mainFrame();
if (m_frame != mainFrame && resultFrame && resultFrame != mainFrame && !resultFrame->editor()->insideVisibleArea(result.point())) {
IntPoint windowPoint = resultFrame->view()->contentsToWindow(result.point());
IntPoint mainFramePoint = mainFrame->view()->windowToContents(windowPoint);
result = mainFrame->eventHandler()->hitTestResultAtPoint(mainFramePoint, allowShadowContent);
}
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) {
m_frame->view()->removePanScrollIcon();
m_frame->view()->setCursor(pointerCursor());
}
#endif
setAutoscrollRenderer(0);
}
m_autoscrollTimer.stop();
m_panScrollInProgress = false;
// If we're not in the top frame we notify it that we are not using the panScroll anymore
if (m_frame->page() && m_frame != m_frame->page()->mainFrame())
m_frame->page()->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)
{
if (!m_frame->document())
return false;
Node* node = m_frame->document()->focusedNode();
if (!node)
node = m_mousePressNode.get();
if (node) {
RenderObject* r = node->renderer();
if (r && !r->isListBox())
return r->enclosingBox()->scroll(direction, granularity);
}
return false;
}
IntPoint EventHandler::currentMousePosition() const
{
return m_currentMousePosition;
}
Frame* subframeForHitTestResult(const MouseEventWithHitTestResults& hitTestResult)
{
if (!hitTestResult.isOverWidget())
return 0;
return subframeForTargetNode(hitTestResult.targetNode());
}
Frame* subframeForTargetNode(Node* node)
{
if (!node)
return 0;
RenderObject* renderer = node->renderer();
if (!renderer || !renderer->isWidget())
return 0;
Widget* widget = static_cast<RenderWidget*>(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)->inputType() == HTMLInputElement::IMAGE;
}
// 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)
{
// 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 iBeamCursor();
Node* node = event.targetNode();
RenderObject* renderer = node ? node->renderer() : 0;
RenderStyle* style = renderer ? renderer->style() : 0;
if (renderer && renderer->isFrameSet()) {
RenderFrameSet* fs = static_cast<RenderFrameSet*>(renderer);
if (fs->canResizeRow(event.localPoint()))
return rowResizeCursor();
if (fs->canResizeColumn(event.localPoint()))
return columnResizeCursor();
}
if (style && style->cursors()) {
const CursorList* cursors = style->cursors();
for (unsigned i = 0; i < cursors->size(); ++i) {
CachedImage* cimage = (*cursors)[i].cursorImage.get();
IntPoint hotSpot = (*cursors)[i].hotSpot;
if (!cimage)
continue;
// 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;
// Do not let the hotspot be outside the bounds of the image.
if (hotSpot.x() < 0 || hotSpot.y() < 0 || hotSpot.x() > size.width() || hotSpot.y() > size.height())
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->isContentEditable());
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();
RenderLayer* layer = renderer ? renderer->enclosingLayer() : 0;
bool inResizer = false;
if (m_frame->view() && layer && layer->isPointInResizeControl(m_frame->view()->windowToContents(event.event().pos())))
inResizer = true;
if ((editable || (renderer && renderer->isText() && node->canStartSelection())) && !inResizer && !scrollbar)
return iBeamCursor();
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();
}
bool EventHandler::handleMousePressEvent(const PlatformMouseEvent& mouseEvent)
{
if (!m_frame->document())
return false;
RefPtr<FrameView> protector(m_frame->view());
m_mousePressed = true;
m_currentMousePosition = mouseEvent.pos();
m_mouseDownTimestamp = mouseEvent.timestamp();
m_mouseDownMayStartDrag = false;
m_mouseDownMayStartSelect = false;
m_mouseDownMayStartAutoscroll = false;
m_mouseDownPos = m_frame->view()->windowToContents(mouseEvent.pos());
m_mouseDownWasInSubframe = false;
MouseEventWithHitTestResults mev = prepareMouseEvent(HitTestRequest(false, true), mouseEvent);
if (!mev.targetNode()) {
invalidateClick();
return false;
}
m_mousePressNode = mev.targetNode();
InspectorController* inspector = m_frame->page()->inspectorController();
if (inspector && inspector->enabled() && inspector->searchingForNodeInPage()) {
inspector->handleMousePressOnNode(m_mousePressNode.get());
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.
if (m_mousePressed)
m_capturingMouseEventsNode = mev.targetNode();
invalidateClick();
return true;
}
#if ENABLE(PAN_SCROLLING)
if (m_frame->page()->mainFrame()->eventHandler()->panScrollInProgress() || m_autoscrollInProgress) {
stopAutoscrollTimer();
invalidateClick();
return true;
}
if (mouseEvent.button() == MiddleButton && !mev.isOverLink()) {
RenderObject* renderer = mev.targetNode()->renderer();
while (renderer && (!renderer->isBox() || !toRenderBox(renderer)->canBeProgramaticallyScrolled(false))) {
if (!renderer->parent() && renderer->node() == renderer->document() && renderer->document()->ownerElement())
renderer = renderer->document()->ownerElement()->renderer();
else
renderer = renderer->parent();
}
if (renderer) {
m_panScrollInProgress = true;
handleAutoscroll(renderer);
invalidateClick();
return true;
}
}
#endif
m_clickCount = mouseEvent.clickCount();
m_clickNode = mev.targetNode();
RenderLayer* layer = m_clickNode->renderer() ? m_clickNode->renderer()->enclosingLayer() : 0;
IntPoint p = m_frame->view()->windowToContents(mouseEvent.pos());
if (layer && layer->isPointInResizeControl(p)) {
layer->setInResizeMode(true);
m_resizeLayer = layer;
m_offsetFromResizeCorner = layer->offsetFromResizeCorner(p);
invalidateClick();
return true;
}
bool swallowEvent = dispatchMouseEvent(eventNames().mousedownEvent, mev.targetNode(), true, m_clickCount, mouseEvent, true);
// 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();
mev = prepareMouseEvent(HitTestRequest(true, true), mouseEvent);
if (wasLastScrollBar && mev.scrollbar() != m_lastScrollbarUnderMouse.get())
m_lastScrollbarUnderMouse = 0;
}
if (swallowEvent) {
// scrollbars should get events anyway, even disabled controls might be scrollable
if (mev.scrollbar())
passMousePressEventToScrollbar(mev, mev.scrollbar());
} else {
// Refetch the event target node if it currently is the shadow node inside an <input> element.
// If a mouse event handler changes the input element type to one that has a widget associated,
// we'd like to EventHandler::handleMousePressEvent to pass the event to the widget and thus the
// event target node can't still be the shadow node.
if (mev.targetNode()->isShadowNode() && mev.targetNode()->shadowParentNode()->hasTagName(inputTag))
mev = prepareMouseEvent(HitTestRequest(true, true), mouseEvent);
Scrollbar* scrollbar = m_frame->view()->scrollbarUnderMouse(mouseEvent);
if (!scrollbar)
scrollbar = mev.scrollbar();
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)
{
if (!m_frame->document())
return false;
RefPtr<FrameView> protector(m_frame->view());
// We get this instead of a second mouse-up
m_mousePressed = false;
m_currentMousePosition = mouseEvent.pos();
MouseEventWithHitTestResults mev = prepareMouseEvent(HitTestRequest(false, true), mouseEvent);
Frame* subframe = subframeForHitTestResult(mev);
if (subframe && passMousePressEventToSubframe(mev, subframe)) {
m_capturingMouseEventsNode = 0;
return true;
}
m_clickCount = mouseEvent.clickCount();
bool swallowMouseUpEvent = dispatchMouseEvent(eventNames().mouseupEvent, mev.targetNode(), true, m_clickCount, mouseEvent, false);
bool swallowClickEvent = false;
// Don't ever dispatch click events for right clicks
if (mouseEvent.button() != RightButton && mev.targetNode() == m_clickNode)
swallowClickEvent = dispatchMouseEvent(eventNames().clickEvent, mev.targetNode(), true, m_clickCount, mouseEvent, true);
if (m_lastScrollbarUnderMouse)
swallowMouseUpEvent = m_lastScrollbarUnderMouse->mouseUp();
bool swallowMouseReleaseEvent = false;
if (!swallowMouseUpEvent)
swallowMouseReleaseEvent = handleMouseReleaseEvent(mev);
invalidateClick();
return swallowMouseUpEvent || swallowClickEvent || swallowMouseReleaseEvent;
}
bool EventHandler::mouseMoved(const PlatformMouseEvent& event)
{
HitTestResult hoveredNode = HitTestResult(IntPoint());
bool result = handleMouseMoveEvent(event, &hoveredNode);
Page* page = m_frame->page();
if (!page)
return result;
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 || !m_frame->document())
return false;
RefPtr<FrameView> protector(m_frame->view());
m_currentMousePosition = mouseEvent.pos();
if (m_hoverTimer.isActive())
m_hoverTimer.stop();
#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(m_lastScrollbarUnderMouse->transformEvent(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 request(m_mousePressed && m_mouseDownMayStartSelect, m_mousePressed, true);
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 (m_frame->view())
scrollbar = m_frame->view()->scrollbarUnderMouse(mouseEvent);
if (!scrollbar)
scrollbar = mev.scrollbar();
if (m_lastScrollbarUnderMouse != scrollbar) {
// Send mouse exited to the old scrollbar.
if (m_lastScrollbarUnderMouse)
m_lastScrollbarUnderMouse->mouseExited();
m_lastScrollbarUnderMouse = m_mousePressed ? 0 : scrollbar;
}
}
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(mev.targetNode(), mouseEvent, true);
// Event dispatch in updateMouseEventTargetNode may have caused the subframe of the target
// node to be detached from its FrameView, in which case the event should not be passed.
if (newSubframe->view())
swallowEvent |= passMouseMoveEventToSubframe(mev, newSubframe.get(), hoveredNode);
} else {
if (scrollbar && !m_mousePressed)
scrollbar->mouseMoved(scrollbar->transformEvent(mouseEvent)); // Handle hover effects on platforms that support visual feedback on scrollbar hovering.
if ((!m_resizeLayer || !m_resizeLayer->inResizeMode()) && !m_frame->page()->mainFrame()->eventHandler()->panScrollInProgress() && m_frame->view())
m_frame->view()->setCursor(selectCursor(mev, scrollbar));
}
m_lastMouseMoveEventSubframe = newSubframe;
if (swallowEvent)
return true;
swallowEvent = dispatchMouseEvent(eventNames().mousemoveEvent, mev.targetNode(), false, 0, mouseEvent, true);
if (!swallowEvent)
swallowEvent = handleMouseDraggedEvent(mev);
return swallowEvent;
}
void EventHandler::invalidateClick()
{
m_clickCount = 0;
m_clickNode = 0;
}
bool EventHandler::handleMouseReleaseEvent(const PlatformMouseEvent& mouseEvent)
{
if (!m_frame->document())
return false;
RefPtr<FrameView> protector(m_frame->view());
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();
}
MouseEventWithHitTestResults mev = prepareMouseEvent(HitTestRequest(false, false, false, true), mouseEvent);
Frame* subframe = m_capturingMouseEventsNode.get() ? subframeForTargetNode(m_capturingMouseEventsNode.get()) : subframeForHitTestResult(mev);
if (subframe && passMouseReleaseEventToSubframe(mev, subframe)) {
m_capturingMouseEventsNode = 0;
return true;
}
bool swallowMouseUpEvent = dispatchMouseEvent(eventNames().mouseupEvent, mev.targetNode(), true, m_clickCount, mouseEvent, false);
// Don't ever dispatch click events for right clicks
bool swallowClickEvent = false;
if (m_clickCount > 0 && mouseEvent.button() != RightButton && mev.targetNode() == m_clickNode)
swallowClickEvent = dispatchMouseEvent(eventNames().clickEvent, mev.targetNode(), true, m_clickCount, mouseEvent, true);
if (m_resizeLayer) {
m_resizeLayer->setInResizeMode(false);
m_resizeLayer = 0;
}
bool swallowMouseReleaseEvent = false;
if (!swallowMouseUpEvent)
swallowMouseReleaseEvent = handleMouseReleaseEvent(mev);
invalidateClick();
return swallowMouseUpEvent || swallowClickEvent || swallowMouseReleaseEvent;
}
bool EventHandler::dispatchDragEvent(const AtomicString& eventType, Node* dragTarget, const PlatformMouseEvent& event, Clipboard* clipboard)
{
IntPoint contentsPos = m_frame->view()->windowToContents(event.pos());
RefPtr<MouseEvent> me = MouseEvent::create(eventType,
true, true, m_frame->document()->defaultView(),
0, event.globalX(), event.globalY(), contentsPos.x(), contentsPos.y(),
event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(),
0, 0, clipboard);
ExceptionCode ec = 0;
EventTargetNodeCast(dragTarget)->dispatchEvent(me.get(), ec);
return me->defaultPrevented();
}
bool EventHandler::updateDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard)
{
bool accept = false;
if (!m_frame->document())
return false;
if (!m_frame->view())
return false;
MouseEventWithHitTestResults mev = prepareMouseEvent(HitTestRequest(true, false), event);
// Drag events should never go to text nodes (following IE, and proper mouseover/out dispatch)
Node* newTarget = mev.targetNode();
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.
if (newTarget)
if (newTarget->hasTagName(frameTag) || newTarget->hasTagName(iframeTag))
accept = static_cast<HTMLFrameElementBase*>(newTarget)->contentFrame()->eventHandler()->updateDragAndDrop(event, clipboard);
else
accept = dispatchDragEvent(eventNames().dragenterEvent, newTarget, event, clipboard);
if (m_dragTarget) {
Frame* frame = (m_dragTarget->hasTagName(frameTag) || m_dragTarget->hasTagName(iframeTag))
? static_cast<HTMLFrameElementBase*>(m_dragTarget.get())->contentFrame() : 0;
if (frame)
accept = frame->eventHandler()->updateDragAndDrop(event, clipboard);
else
dispatchDragEvent(eventNames().dragleaveEvent, m_dragTarget.get(), event, clipboard);
}
} else {
if (newTarget)
if (newTarget->hasTagName(frameTag) || newTarget->hasTagName(iframeTag))
accept = static_cast<HTMLFrameElementBase*>(newTarget)->contentFrame()->eventHandler()->updateDragAndDrop(event, clipboard);
else
accept = dispatchDragEvent(eventNames().dragoverEvent, newTarget, event, clipboard);
}
m_dragTarget = newTarget;
return accept;
}
void EventHandler::cancelDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard)
{
if (m_dragTarget) {
Frame* frame = (m_dragTarget->hasTagName(frameTag) || m_dragTarget->hasTagName(iframeTag))
? static_cast<HTMLFrameElementBase*>(m_dragTarget.get())->contentFrame() : 0;
if (frame)
frame->eventHandler()->cancelDragAndDrop(event, clipboard);
else
dispatchDragEvent(eventNames().dragleaveEvent, m_dragTarget.get(), event, clipboard);
}
clearDragState();
}
bool EventHandler::performDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard)
{
bool accept = false;
if (m_dragTarget) {
Frame* frame = (m_dragTarget->hasTagName(frameTag) || m_dragTarget->hasTagName(iframeTag))
? static_cast<HTMLFrameElementBase*>(m_dragTarget.get())->contentFrame() : 0;
if (frame)
accept = frame->eventHandler()->performDragAndDrop(event, clipboard);
else
accept = dispatchDragEvent(eventNames().dropEvent, m_dragTarget.get(), event, clipboard);
}
clearDragState();
return accept;
}
void EventHandler::clearDragState()
{
m_dragTarget = 0;
m_capturingMouseEventsNode = 0;
#if PLATFORM(MAC)
m_sendingEventToSubview = false;
#endif
}
void EventHandler::setCapturingMouseEventsNode(PassRefPtr<Node> n)
{
m_capturingMouseEventsNode = n;
}
MouseEventWithHitTestResults EventHandler::prepareMouseEvent(const HitTestRequest& request, const PlatformMouseEvent& mev)
{
ASSERT(m_frame);
ASSERT(m_frame->document());
IntPoint documentPoint = m_frame->view()->windowToContents(mev.pos());
return m_frame->document()->prepareMouseEvent(request, documentPoint, mev);
}
#if ENABLE(SVG)
static inline SVGElementInstance* instanceAssociatedWithShadowTreeElement(Node* referenceNode)
{
if (!referenceNode || !referenceNode->isSVGElement())
return 0;
Node* shadowTreeElement = referenceNode->shadowTreeRootNode();
if (!shadowTreeElement)
return 0;
Node* shadowTreeParentElement = shadowTreeElement->shadowParentNode();
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();
if (result)
result = result->shadowAncestorNode();
}
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) {
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)
EventTargetNodeCast(m_lastNodeUnderMouse.get())->dispatchMouseEvent(mouseEvent, eventNames().mouseoutEvent, 0, m_nodeUnderMouse.get());
// send mouseover event to the new node
if (m_nodeUnderMouse)
EventTargetNodeCast(m_nodeUnderMouse.get())->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)
{
updateMouseEventTargetNode(targetNode, mouseEvent, setUnder);
bool swallowEvent = false;
if (m_nodeUnderMouse)
swallowEvent = EventTargetNodeCast(m_nodeUnderMouse.get())->dispatchMouseEvent(mouseEvent, eventType, clickCount);
if (!swallowEvent && eventType == eventNames().mousedownEvent) {
// 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();
RenderObject* renderer = node ? node->renderer() : 0;
// Walk up the render tree to search for a node to focus.
// Walking up the DOM tree wouldn't work for shadow trees, like those behind the engine-based text fields.
while (renderer) {
node = renderer->element();
if (node && node->isFocusable()) {
// 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->isShadowNode() ? node->shadowParentNode() : node;
if (m_frame->selection()->isRange() &&
m_frame->selection()->toRange()->compareNode(n, ec) == Range::NODE_INSIDE &&
n->isDescendantOf(m_frame->document()->focusedNode()))
return false;
break;
}
renderer = renderer->parent();
}
// 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 (node && node->isMouseFocusable()) {
if (!m_frame->page()->focusController()->setFocusedNode(node, m_frame))
swallowEvent = true;
} else if (!node || !node->focused()) {
if (!m_frame->page()->focusController()->setFocusedNode(0, m_frame))
swallowEvent = true;
}
}
return swallowEvent;
}
bool EventHandler::handleWheelEvent(PlatformWheelEvent& e)
{
Document* doc = m_frame->document();
if (!doc)
return false;
RenderObject* docRenderer = doc->renderer();
if (!docRenderer)
return false;
RefPtr<FrameView> protector(m_frame->view());
IntPoint vPoint = m_frame->view()->windowToContents(e.pos());
HitTestRequest request(true, false);
HitTestResult result(vPoint);
doc->renderView()->layer()->hitTest(request, result);
Node* node = result.innerNode();
if (node) {
// Figure out which view to send the event to.
RenderObject* target = node->renderer();
if (result.isOverWidget() && target && target->isWidget()) {
Widget* widget = static_cast<RenderWidget*>(target)->widget();
if (widget && passWheelEventToWidget(e, widget)) {
e.accept();
return true;
}
}
node = node->shadowAncestorNode();
EventTargetNodeCast(node)->dispatchWheelEvent(e);
if (e.isAccepted())
return true;
if (node->renderer()) {
// Just 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).
scrollAndAcceptEvent(e.deltaX(), ScrollLeft, ScrollRight, e, node);
scrollAndAcceptEvent(e.deltaY(), ScrollUp, ScrollDown, e, node);
}
}
if (!e.isAccepted())
m_frame->view()->wheelEvent(e);
return e.isAccepted();
}
bool EventHandler::sendContextMenuEvent(const PlatformMouseEvent& event)
{
Document* doc = m_frame->document();
FrameView* v = m_frame->view();
if (!doc || !v)
return false;
bool swallowEvent;
IntPoint viewportPos = v->windowToContents(event.pos());
MouseEventWithHitTestResults mev = doc->prepareMouseEvent(HitTestRequest(false, true), viewportPos, event);
// Context menu events shouldn't select text in GTK+ applications or in Chromium.
// FIXME: This should probably be configurable by embedders. Consider making it a WebPreferences setting.
// See: https://bugs.webkit.org/show_bug.cgi?id=15279
#if !PLATFORM(GTK) && !PLATFORM(CHROMIUM)
if (!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() || mev.targetNode() && mev.targetNode()->isTextNode())) {
m_mouseDownMayStartSelect = true; // context menu events are always allowed to perform a selection
selectClosestWordOrLinkFromMouseEvent(mev);
}
#endif
swallowEvent = dispatchMouseEvent(eventNames().contextmenuEvent, mev.targetNode(), true, 0, event, true);
return swallowEvent;
}
void EventHandler::scheduleHoverStateUpdate()
{
if (!m_hoverTimer.isActive())
m_hoverTimer.startOneShot(0);
}
// 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;
for (RenderObject* curr = node->renderer(); curr; curr = curr->parent())
if (Node* node = curr->element())
return EventTargetNodeCast(node)->dispatchEventForType(eventNames().selectstartEvent, true, true);
return true;
}
bool EventHandler::canMouseDragExtendSelect(Node* node)
{
if (!node || !node->renderer())
return true;
for (RenderObject* curr = node->renderer(); curr; curr = curr->parent())
if (Node* node = curr->element())
return EventTargetNodeCast(node)->dispatchEventForType(eventNames().selectstartEvent, true, true);
return true;
}
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()) {
HitTestResult result(m_frame->view()->windowToContents(m_currentMousePosition));
renderer->layer()->hitTest(HitTestRequest(false, false, true), result);
m_frame->document()->updateRendering();
}
}
static EventTargetNode* eventTargetNodeForDocument(Document* doc)
{
if (!doc)
return 0;
Node* node = doc->focusedNode();
if (!node) {
if (doc->isHTMLDocument())
node = doc->body();
else
node = doc->documentElement();
if (!node)
return 0;
}
return EventTargetNodeCast(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)
{
#if ENABLE(PAN_SCROLLING)
if (m_frame->page()->mainFrame()->eventHandler()->panScrollInProgress() || m_autoscrollInProgress) {
String escKeyId = "U+001B";
// If a key is pressed while the autoscroll/panScroll is in progress then we want to stop
if (initialKeyEvent.keyIdentifier() == escKeyId && initialKeyEvent.type() == PlatformKeyboardEvent::KeyUp)
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<EventTargetNode> node = eventTargetNodeForDocument(m_frame->document());
if (!node)
return false;
// 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);
return keydown->defaultHandled() || keydown->defaultPrevented();
}
// 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);
bool keydownResult = keydown->defaultHandled() || keydown->defaultPrevented();
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;
String key = event->keyIdentifier();
bool isShifted = event->getModifierState("Shift");
bool isOptioned = event->getModifierState("Alt");
if (key == "Up") {
m_frame->selection()->modify((isShifted) ? SelectionController::EXTEND : SelectionController::MOVE, SelectionController::BACKWARD, LineGranularity, true);
event->setDefaultHandled();
}
else if (key == "Down") {
m_frame->selection()->modify((isShifted) ? SelectionController::EXTEND : SelectionController::MOVE, SelectionController::FORWARD, LineGranularity, true);
event->setDefaultHandled();
}
else if (key == "Left") {
m_frame->selection()->modify((isShifted) ? SelectionController::EXTEND : SelectionController::MOVE, SelectionController::LEFT, (isOptioned) ? WordGranularity : CharacterGranularity, true);
event->setDefaultHandled();
}
else if (key == "Right") {
m_frame->selection()->modify((isShifted) ? SelectionController::EXTEND : SelectionController::MOVE, SelectionController::RIGHT, (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);
// 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);
}
}
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
{
IntPoint dragLocation = m_frame->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
{
ASSERT(node);
if (node->hasChildNodes() || !m_frame->view())
return false;
return m_frame->page() && m_frame->page()->dragController()->mayStartDragAtEventLocation(m_frame, point);
}
void EventHandler::dragSourceMovedTo(const PlatformMouseEvent& 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);
}
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;
}
// 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(true, false);
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
m_frame->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(), IntPoint() + 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
dragState().m_dragClipboard->sourceOperation(srcOp);
// Yuck, dragSourceMovedTo() can be called 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) {
DragController* dragController = m_frame->page() ? m_frame->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;
}
bool EventHandler::handleTextInputEvent(const String& text, Event* underlyingEvent, bool isLineBreak, bool isBackTab)
{
// 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;
RefPtr<TextEvent> event = TextEvent::create(m_frame->domWindow(), text);
event->setUnderlyingEvent(underlyingEvent);
event->setIsLineBreak(isLineBreak);
event->setIsBackTab(isBackTab);
ExceptionCode ec;
target->dispatchEvent(event, ec);
return event->defaultHandled();
}
#if !PLATFORM(MAC) && !PLATFORM(QT)
bool EventHandler::invertSenseOfTabsToLinks(KeyboardEvent*) const
{
return false;
}
#endif
bool EventHandler::tabsToLinks(KeyboardEvent* event) const
{
Page* page = m_frame->page();
if (!page)
return false;
if (page->chrome()->client()->tabsToLinks())
return !invertSenseOfTabsToLinks(event);
return invertSenseOfTabsToLinks(event);
}
void EventHandler::defaultTextInputEventHandler(TextEvent* event)
{
String data = event->data();
if (data == "\n") {
if (event->isLineBreak()) {
if (m_frame->editor()->insertLineBreak())
event->setDefaultHandled();
} else {
if (m_frame->editor()->insertParagraphSeparator())
event->setDefaultHandled();
}
} else {
if (m_frame->editor()->insertTextWithoutSendingTextEvent(data, false, event))
event->setDefaultHandled();
}
}
#if PLATFORM(QT) || PLATFORM(MAC) || PLATFORM(ANDROID)
// These two platforms handle the space event in the platform-specific WebKit code.
// Eventually it would be good to eliminate that and use the code here instead, but
// the Qt version is inside an ifdef and the Mac version has some extra behavior
// so we can't unify everything yet.
void EventHandler::defaultSpaceEventHandler(KeyboardEvent*)
{
}
#else
void EventHandler::defaultSpaceEventHandler(KeyboardEvent* event)
{
ScrollDirection direction = event->shiftKey() ? ScrollUp : ScrollDown;
if (scrollOverflow(direction, ScrollByPage)) {
event->setDefaultHandled();
return;
}
FrameView* view = m_frame->view();
if (!view)
return;
if (view->scroll(direction, ScrollByPage))
event->setDefaultHandled();
}
#endif
void EventHandler::defaultTabEventHandler(KeyboardEvent* event)
{
// 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()
{
if (Document* d = m_frame->document())
if (Node* node = d->focusedNode())
if (RenderObject* r = node->renderer())
r->capsLockStateMayHaveChanged();
}
unsigned EventHandler::pendingFrameUnloadEventCount()
{
return m_pendingFrameUnloadEventCount;
}
void EventHandler::addPendingFrameUnloadEventCount()
{
m_pendingFrameUnloadEventCount += 1;
m_frame->page()->changePendingUnloadEventCount(1);
return;
}
void EventHandler::removePendingFrameUnloadEventCount()
{
ASSERT( (-1 + (int)m_pendingFrameUnloadEventCount) >= 0 );
m_pendingFrameUnloadEventCount -= 1;
m_frame->page()->changePendingUnloadEventCount(-1);
return;
}
void EventHandler::clearPendingFrameUnloadEventCount()
{
m_frame->page()->changePendingUnloadEventCount(-((int)m_pendingFrameUnloadEventCount));
m_pendingFrameUnloadEventCount = 0;
return;
}
unsigned EventHandler::pendingFrameBeforeUnloadEventCount()
{
return m_pendingFrameBeforeUnloadEventCount;
}
void EventHandler::addPendingFrameBeforeUnloadEventCount()
{
m_pendingFrameBeforeUnloadEventCount += 1;
m_frame->page()->changePendingBeforeUnloadEventCount(1);
return;
}
void EventHandler::removePendingFrameBeforeUnloadEventCount()
{
ASSERT( (-1 + (int)m_pendingFrameBeforeUnloadEventCount) >= 0 );
m_pendingFrameBeforeUnloadEventCount -= 1;
m_frame->page()->changePendingBeforeUnloadEventCount(-1);
return;
}
void EventHandler::clearPendingFrameBeforeUnloadEventCount()
{
m_frame->page()->changePendingBeforeUnloadEventCount(-((int)m_pendingFrameBeforeUnloadEventCount));
m_pendingFrameBeforeUnloadEventCount = 0;
return;
}
bool EventHandler::passMousePressEventToScrollbar(MouseEventWithHitTestResults& mev, Scrollbar* scrollbar)
{
if (!scrollbar || !scrollbar->enabled())
return false;
return scrollbar->mouseDown(mev.event());
}
#if ENABLE(TOUCH_EVENTS) // Android
bool EventHandler::handleTouchEvent(const PlatformTouchEvent& e)
{
// only handle the touch event in the top frame handler
if (m_frame->tree()->parent(true))
return m_frame->tree()->parent()->eventHandler()->handleTouchEvent(e);
Document* doc = m_frame->document();
if (!doc)
return false;
RenderObject* docRenderer = doc->renderer();
if (!docRenderer)
return false;
if (doc->touchEventListeners().size() == 0)
return false;
TouchEventType type = e.eventType();
if (type == TouchEventStart) {
Frame* frame = m_frame;
IntPoint vPoint = frame->view()->windowToContents(e.pos());
HitTestRequest request(true, false);
HitTestResult result(vPoint);
frame->contentRenderer()->layer()->hitTest(request, result);
Node* node = result.innerNode();
if (node) {
RenderObject* target = node->renderer();
while (target && target->isWidget()) {
Widget* widget = static_cast<RenderWidget*>(target)->widget();
if (widget->isFrameView()) {
frame = static_cast<FrameView*>(widget)->frame();
vPoint = frame->view()->windowToContents(e.pos());
HitTestResult ret(vPoint);
frame->contentRenderer()->layer()->hitTest(request, ret);
node = ret.innerNode();
if (!node)
break;
else
target = node->renderer();
} else
// plugin view??
break;
}
}
if (!node || !node->isEventTargetNode()) {
// reset to the top document node
node = doc;
frame = m_frame;
vPoint = frame->view()->windowToContents(e.pos());
}
m_touch = Touch::create(frame, EventTargetNodeCast(node), 0,
e.x(), e.y(), vPoint.x(), vPoint.y());
} else if (m_touch) {
if ((type == TouchEventMove) && (e.x() == m_touch->screenX()) &&
(e.y() == m_touch->screenY())) {
// don't trigger the event if it hasn't really moved
return false;
}
IntPoint vPoint = m_touch->frame()->view()->windowToContents(e.pos());
m_touch->updateLocation(e.x(), e.y(), vPoint.x(), vPoint.y());
} else {
return false;
}
RefPtr<TouchList> touchList = TouchList::create();
touchList->append(m_touch);
RefPtr<TouchEvent> te;
switch(type) {
case TouchEventStart:
te = TouchEvent::create(touchList.get(), touchList.get(), touchList.get(),
eventNames().touchstartEvent, m_touch->frame()->document()->defaultView(),
m_touch->screenX(), m_touch->screenY(), m_touch->pageX(), m_touch->pageY());
break;
case TouchEventEnd:
te = TouchEvent::create(touchList.get(), touchList.get(), touchList.get(),
eventNames().touchendEvent, m_touch->frame()->document()->defaultView(),
m_touch->screenX(), m_touch->screenY(), m_touch->pageX(), m_touch->pageY());
break;
case TouchEventMove:
te = TouchEvent::create(touchList.get(), touchList.get(), touchList.get(),
eventNames().touchmoveEvent, m_touch->frame()->document()->defaultView(),
m_touch->screenX(), m_touch->screenY(), m_touch->pageX(), m_touch->pageY());
break;
case TouchEventCancel:
te = TouchEvent::create(touchList.get(), touchList.get(), touchList.get(),
eventNames().touchcancelEvent, m_touch->frame()->document()->defaultView(),
m_touch->screenX(), m_touch->screenY(), m_touch->pageX(), m_touch->pageY());
break;
default:
return false;
}
ExceptionCode ec = 0;
static_cast<EventTargetNode*>(m_touch->target())->dispatchEvent(te.get(), ec);
if (type == TouchEventEnd || type == TouchEventCancel) {
m_touch = 0;
}
return te->defaultPrevented();
}
#endif
}