--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/webengine/osswebengine/WebCore/page/EventHandler.cpp Mon Mar 30 12:54:55 2009 +0300
@@ -0,0 +1,1769 @@
+/*
+ * Copyright (C) 2006, 2007 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 "CachedImage.h"
+#include "ChromeClient.h"
+#include "Cursor.h"
+#include "Document.h"
+#include "DragController.h"
+#include "Editor.h"
+#include "EventNames.h"
+#include "FloatPoint.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 "KeyboardEvent.h"
+#include "MouseEvent.h"
+#include "MouseEventWithHitTestResults.h"
+#include "Page.h"
+#include "PlatformKeyboardEvent.h"
+#include "PlatformScrollBar.h"
+#include "PlatformWheelEvent.h"
+#include "RenderWidget.h"
+#include "SelectionController.h"
+#include "Settings.h"
+#include "TextEvent.h"
+
+#if ENABLE(SVG)
+#include "SVGCursorElement.h"
+#include "SVGDocument.h"
+#include "SVGLength.h"
+#include "SVGNames.h"
+#endif
+
+namespace WebCore {
+
+using namespace EventNames;
+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;
+const double TextDragDelay = 0.15;
+
+// 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
+
+const double autoscrollInterval = 0.1;
+
+static Frame* subframeForTargetNode(Node* node);
+
+EventHandler::EventHandler(Frame* frame)
+ : m_frame(frame)
+ , m_mousePressed(false)
+ , m_mouseDownMayStartSelect(false)
+ , m_mouseDownMayStartDrag(false)
+ , m_mouseDownWasSingleClickInSelection(false)
+ , m_beganSelectingText(false)
+ , m_hoverTimer(this, &EventHandler::hoverTimerFired)
+ , m_autoscrollTimer(this, &EventHandler::autoscrollTimerFired)
+ , m_autoscrollRenderer(0)
+ , 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)
+#if PLATFORM(MAC)
+ , m_mouseDownView(nil)
+ , m_sendingEventToSubview(false)
+ , m_activationEventNumber(0)
+#endif
+{
+}
+
+EventHandler::~EventHandler()
+{
+}
+
+EventHandler::EventHandlerDragState& EventHandler::dragState()
+{
+ static EventHandlerDragState state;
+ return state;
+}
+
+void EventHandler::clear()
+{
+ m_hoverTimer.stop();
+ m_resizeLayer = 0;
+ m_nodeUnderMouse = 0;
+ m_lastNodeUnderMouse = 0;
+ m_lastMouseMoveEventSubframe = 0;
+ m_lastScrollbarUnderMouse = 0;
+ m_clickCount = 0;
+ m_clickNode = 0;
+ 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 (m_frame->shouldChangeSelection(newSelection))
+ m_frame->selectionController()->setSelection(newSelection);
+ }
+}
+
+bool EventHandler::handleMousePressEventDoubleClick(const MouseEventWithHitTestResults& event)
+{
+ if (event.event().button() != LeftButton)
+ return false;
+
+ if (m_frame->selectionController()->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->selectionController()->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->selectionController()->contains(vPoint)) {
+ m_mouseDownWasSingleClickInSelection = true;
+ return false;
+ }
+
+ VisiblePosition visiblePos(innerNode->renderer()->positionForPoint(event.localPoint()));
+ if (visiblePos.isNull())
+ visiblePos = VisiblePosition(innerNode, innerNode->caretMinOffset(), DOWNSTREAM);
+ Position pos = visiblePos.deepEquivalent();
+
+ Selection newSelection = m_frame->selectionController()->selection();
+ if (extendSelection && newSelection.isCaretOrRange()) {
+ m_frame->selectionController()->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->selectionController()->setSelection(newSelection);
+
+ return true;
+}
+
+bool EventHandler::handleMousePressEvent(const MouseEventWithHitTestResults& event)
+{
+ 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 (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->selectionController()->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->renderer() && m_mousePressNode->renderer()->shouldAutoscroll());
+
+ 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) {
+ // 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->shouldAutoscroll())
+ renderer = renderer->parent();
+ if (renderer)
+ handleAutoscroll(renderer);
+ }
+
+ 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->renderer() || !m_frame->renderer()->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->renderer()->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;
+ RenderObject* renderer = m_frame->renderer();
+ 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->selectionController()->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->selectionController()->setLastChangeWasHorizontalExtension(false);
+ m_frame->selectionController()->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)
+{
+ stopAutoscrollTimer();
+
+ if (handleMouseUp(event))
+ return true;
+
+ // Used to prevent mouseMoveEvent from initiating a drag before
+ // the mouse is pressed again.
+ m_frame->selectionController()->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->selectionController()->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->selectionController()->setSelection(newSelection);
+
+ handled = true;
+ }
+
+ m_frame->notifyRendererOfSelectionChange(true);
+
+ m_frame->selectionController()->selectFrameElementInParentIfFullySelected();
+
+ return handled;
+}
+
+void EventHandler::handleAutoscroll(RenderObject* renderer)
+{
+ if (m_autoscrollTimer.isActive())
+ return;
+ setAutoscrollRenderer(renderer);
+ startAutoscrollTimer();
+}
+
+void EventHandler::autoscrollTimerFired(Timer<EventHandler>*)
+{
+ if (!m_mousePressed) {
+ stopAutoscrollTimer();
+ return;
+ }
+ if (RenderObject* r = autoscrollRenderer())
+ r->autoscroll();
+}
+
+RenderObject* EventHandler::autoscrollRenderer() const
+{
+ return m_autoscrollRenderer;
+}
+
+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;
+ }
+
+ 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->renderer())
+ return result;
+ m_frame->renderer()->layer()->hitTest(HitTestRequest(true, true), result);
+
+ IntPoint widgetPoint(point);
+ while (true) {
+ Node* n = result.innerNode();
+ if (!n || !n->renderer() || !n->renderer()->isWidget())
+ break;
+ Widget* widget = static_cast<RenderWidget*>(n->renderer())->widget();
+ if (!widget || !widget->isFrameView())
+ break;
+ Frame* frame = static_cast<HTMLFrameElementBase*>(n)->contentFrame();
+ if (!frame || !frame->renderer())
+ break;
+ int absX, absY;
+ n->renderer()->absolutePosition(absX, absY, true);
+ FrameView* view = static_cast<FrameView*>(widget);
+ widgetPoint.move(view->contentsX() - absX, view->contentsY() - absY);
+ HitTestResult widgetHitTestResult(widgetPoint);
+ frame->renderer()->layer()->hitTest(HitTestRequest(true, true), widgetHitTestResult);
+ result = widgetHitTestResult;
+ }
+
+ if (!allowShadowContent)
+ result.setToNonShadowAncestor();
+
+ return result;
+}
+
+
+void EventHandler::startAutoscrollTimer()
+{
+ m_autoscrollTimer.startRepeating(autoscrollInterval);
+}
+
+void EventHandler::stopAutoscrollTimer(bool rendererIsBeingDestroyed)
+{
+ if (m_mouseDownWasInSubframe) {
+ if (Frame* subframe = subframeForTargetNode(m_mousePressNode.get()))
+ subframe->eventHandler()->stopAutoscrollTimer(rendererIsBeingDestroyed);
+ return;
+ }
+
+ if (!rendererIsBeingDestroyed && autoscrollRenderer())
+ autoscrollRenderer()->stopAutoscroll();
+ setAutoscrollRenderer(0);
+ m_autoscrollTimer.stop();
+}
+
+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->scroll(direction, granularity);
+ }
+
+ return false;
+}
+
+IntPoint EventHandler::currentMousePosition() const
+{
+ return m_currentMousePosition;
+}
+
+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->selectionController()->rootEditableElement() != node->rootEditableElement();
+}
+
+Cursor EventHandler::selectCursor(const MouseEventWithHitTestResults& event, PlatformScrollbar* 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->selectionController()->isCaretOrRange() && !m_capturingMouseEventsNode)
+ return iBeamCursor();
+
+ Node* node = event.targetNode();
+ RenderObject* renderer = node ? node->renderer() : 0;
+ RenderStyle* style = renderer ? renderer->style() : 0;
+
+ if (style && style->cursors()) {
+ const CursorList* cursors = style->cursors();
+ for (unsigned i = 0; i < cursors->size(); ++i) {
+ CachedImage* cimage = (*cursors)[i].cursorImage;
+ IntPoint hotSpot = (*cursors)[i].hotSpot;
+#if ENABLE(SVG)
+ if (!cimage) {
+ Element* e = node->document()->getElementById((*cursors)[i].cursorFragmentId);
+ if (e && e->hasTagName(cursorTag)) {
+ hotSpot.setX(int(static_cast<SVGCursorElement*>(e)->x().value()));
+ hotSpot.setY(int(static_cast<SVGCursorElement*>(e)->y().value()));
+ cimage = static_cast<SVGCursorElement*>(e)->cachedImage();
+ }
+ }
+#endif
+ if (!cimage)
+ 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();
+ }
+ 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();
+
+ Frame* subframe = subframeForTargetNode(mev.targetNode());
+ 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;
+ }
+
+ 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(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())
+ mev = prepareMouseEvent(HitTestRequest(true, true), mouseEvent);
+
+ 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);
+
+ PlatformScrollbar* 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 = subframeForTargetNode(mev.targetNode());
+ if (subframe && passMousePressEventToSubframe(mev, subframe)) {
+ m_capturingMouseEventsNode = 0;
+ return true;
+ }
+
+ m_clickCount = mouseEvent.clickCount();
+ bool swallowMouseUpEvent = dispatchMouseEvent(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(clickEvent, mev.targetNode(), true, m_clickCount, mouseEvent, true);
+
+ 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(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->handleMouseMoveEvent(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();
+
+ PlatformScrollbar* 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->handleMouseOutEvent(mouseEvent);
+ m_lastScrollbarUnderMouse = scrollbar;
+ }
+ }
+
+ bool swallowEvent = false;
+ Node* targetNode = m_capturingMouseEventsNode ? m_capturingMouseEventsNode.get() : mev.targetNode();
+ RefPtr<Frame> newSubframe = subframeForTargetNode(targetNode);
+
+ // 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);
+ swallowEvent |= passMouseMoveEventToSubframe(mev, newSubframe.get(), hoveredNode);
+ } else {
+ if (scrollbar && !m_mousePressed)
+ scrollbar->handleMouseMoveEvent(mouseEvent); // Handle hover effects on platforms that support visual feedback on scrollbar hovering.
+ if ((!m_resizeLayer || !m_resizeLayer->inResizeMode()) && m_frame->view())
+ m_frame->view()->setCursor(selectCursor(mev, scrollbar));
+ }
+
+ m_lastMouseMoveEventSubframe = newSubframe;
+
+ if (swallowEvent)
+ return true;
+
+ swallowEvent = dispatchMouseEvent(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;
+ return true;
+ }
+#endif
+
+ if (m_frameSetBeingResized)
+ return dispatchMouseEvent(mouseupEvent, m_frameSetBeingResized.get(), true, m_clickCount, mouseEvent, false);
+
+ if (m_lastScrollbarUnderMouse) {
+ invalidateClick();
+ return m_lastScrollbarUnderMouse->handleMouseReleaseEvent(mouseEvent);
+ }
+
+ MouseEventWithHitTestResults mev = prepareMouseEvent(HitTestRequest(false, false, false, true), mouseEvent);
+ Node* targetNode = m_capturingMouseEventsNode.get() ? m_capturingMouseEventsNode.get() : mev.targetNode();
+ Frame* subframe = subframeForTargetNode(targetNode);
+ if (subframe && passMouseReleaseEventToSubframe(mev, subframe)) {
+ m_capturingMouseEventsNode = 0;
+ return true;
+ }
+
+ bool swallowMouseUpEvent = dispatchMouseEvent(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)
+ #if PLATFORM(SYMBIAN)
+ {
+ int clickcount = m_clickCount;
+ m_clickCount = 0;
+ swallowClickEvent = dispatchMouseEvent(clickEvent, mev.targetNode(), true, clickcount, mouseEvent, true);
+ }
+ #else
+ swallowClickEvent = dispatchMouseEvent(clickEvent, mev.targetNode(), true, m_clickCount, mouseEvent, true);
+ #endif
+ 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 = new MouseEvent(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, true);
+ 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(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(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(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(dragleaveEvent, m_dragTarget.get(), event, clipboard);
+ }
+ m_dragTarget = 0;
+}
+
+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(dropEvent, m_dragTarget.get(), event, clipboard);
+ }
+ m_dragTarget = 0;
+ return accept;
+}
+
+Node* EventHandler::nodeUnderMouse() const
+{
+ return m_nodeUnderMouse.get();
+}
+
+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);
+}
+
+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();
+
+ // 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;
+
+ // 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 (m_lastNodeUnderMouse != m_nodeUnderMouse) {
+ // send mouseout event to the old node
+ if (m_lastNodeUnderMouse)
+ EventTargetNodeCast(m_lastNodeUnderMouse.get())->dispatchMouseEvent(mouseEvent, mouseoutEvent, 0, m_nodeUnderMouse.get());
+ // send mouseover event to the new node
+ if (m_nodeUnderMouse)
+ EventTargetNodeCast(m_nodeUnderMouse.get())->dispatchMouseEvent(mouseEvent, mouseoverEvent, 0, m_lastNodeUnderMouse.get());
+ }
+ m_lastNodeUnderMouse = m_nodeUnderMouse;
+ }
+}
+
+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 == 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->selectionController()->isRange() &&
+ m_frame->selectionController()->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;
+
+ IntPoint vPoint = m_frame->view()->windowToContents(e.pos());
+
+ HitTestRequest request(true, false);
+ HitTestResult result(vPoint);
+ doc->renderer()->layer()->hitTest(request, result);
+ Node* node = result.innerNode();
+
+ if (node) {
+ // Figure out which view to send the event to.
+ RenderObject* target = node->renderer();
+
+ if (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).
+ float deltaX = e.isContinuous() ? e.continuousDeltaX() : e.deltaX();
+ float deltaY = e.isContinuous() ? e.continuousDeltaY() : e.deltaY();
+ if (deltaX && node->renderer()->scroll(deltaX < 0 ? ScrollRight : ScrollLeft, e.isContinuous() ? ScrollByPixel : ScrollByLine,
+ deltaX < 0 ? -deltaX : deltaX))
+ e.accept();
+ if (deltaY && node->renderer()->scroll(deltaY < 0 ? ScrollDown : ScrollUp, e.isContinuous() ? ScrollByPixel : ScrollByLine,
+ deltaY < 0 ? -deltaY : deltaY))
+ e.accept();
+ }
+ }
+
+ 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);
+
+ if (!m_frame->selectionController()->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->selectionController()->isContentEditable() || mev.targetNode() && mev.targetNode()->isTextNode())) {
+ m_mouseDownMayStartSelect = true; // context menu events are always allowed to perform a selection
+ selectClosestWordFromMouseEvent(mev);
+ }
+
+ swallowEvent = dispatchMouseEvent(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)->dispatchHTMLEvent(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)->dispatchHTMLEvent(selectstartEvent, true, true);
+
+ return true;
+}
+
+void EventHandler::setResizingFrameSet(HTMLFrameSetElement* frameSet)
+{
+ m_frameSetBeingResized = frameSet;
+}
+
+void EventHandler::hoverTimerFired(Timer<EventHandler>*)
+{
+ m_hoverTimer.stop();
+
+ ASSERT(m_frame);
+ ASSERT(m_frame->document());
+
+ if (RenderObject* renderer = m_frame->renderer()) {
+ 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::keyEvent(const PlatformKeyboardEvent& initialKeyEvent)
+{
+ // Check for cases where we are too early for events -- possible unmatched key up
+ // from pressing return in the location bar.
+ EventTargetNode* node = eventTargetNodeForDocument(m_frame->document());
+ if (!node)
+ return false;
+
+ if (initialKeyEvent.isKeyUp())
+ return !node->dispatchKeyEvent(initialKeyEvent);
+
+ m_frame->loader()->resetMultipleFormSubmissionProtection();
+
+ // Prepare the keyPress in advance of the keyDown so we can fire the input method
+ // in advance of keyDown
+ PlatformKeyboardEvent keyPressEvent = initialKeyEvent;
+ keyPressEvent.setIsAutoRepeat(true);
+ RefPtr<KeyboardEvent> keypress = new KeyboardEvent(keyPressEvent, m_frame->document()->defaultView());
+ keypress->setTarget(node);
+
+ // Run input method in advance of DOM event handling. This may result in the IM
+ // modifying the page prior the keydown event, however this behaviour is necessary
+ // in order to match IE
+ m_frame->editor()->handleInputMethodKeypress(keypress.get());
+
+ bool handledByInputMethod = keypress->defaultHandled();
+
+ PlatformKeyboardEvent keyDownEvent = initialKeyEvent;
+
+ if (handledByInputMethod)
+ keyDownEvent.setWindowsKeyCode(CompositionEventKeyCode);
+
+ // We always send keyDown and keyPress for all events, including autorepeat keys
+ keyDownEvent.setIsAutoRepeat(false);
+
+ bool result = !node->dispatchKeyEvent(keyDownEvent);
+
+ // Focus may have change during the keyDown handling, so refetch node
+ node = eventTargetNodeForDocument(m_frame->document());
+ if (!node)
+ return result;
+
+ if (keypress->defaultHandled())
+ return true;
+
+ if (handledByInputMethod)
+ return result;
+
+ // If the default handling has been prevented on the keydown, we prevent it on
+ // the keypress as well
+ if (result)
+ keypress->setDefaultHandled();
+
+ ExceptionCode ec;
+ node->dispatchEvent(keypress, ec, true);
+
+ return result || keypress->defaultHandled() || keypress->defaultPrevented();
+}
+
+void EventHandler::defaultKeyboardEventHandler(KeyboardEvent* event)
+{
+ if (event->type() == keypressEvent) {
+ m_frame->editor()->handleKeypress(event);
+ if (event->defaultHandled())
+ return;
+ if (event->keyIdentifier() == "U+0009")
+ defaultTabEventHandler(event, false);
+ }
+}
+
+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(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(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->renderer()->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->selectionController()->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) {
+ int srcX, srcY;
+ dragState().m_dragSrc->renderer()->absolutePosition(srcX, srcY);
+ IntSize delta = m_mouseDownPos - IntPoint(srcX, srcY);
+ dragState().m_dragClipboard->setDragImageElement(dragState().m_dragSrc.get(), IntPoint() + delta);
+ }
+
+ m_mouseDownMayStartDrag = dispatchDragSrcEvent(dragstartEvent, m_mouseDown)
+ && !m_frame->selectionController()->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(dragendEvent, event.event());
+ m_mouseDownMayStartDrag = false;
+ }
+ }
+
+ 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)
+{
+ 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 = new TextEvent(m_frame->domWindow(), text);
+ event->setUnderlyingEvent(underlyingEvent);
+ event->setIsLineBreak(isLineBreak);
+ event->setIsBackTab(isBackTab);
+ ExceptionCode ec;
+ return target->dispatchEvent(event.release(), ec, true);
+}
+
+
+#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 == "\t") {
+ defaultTabEventHandler(event, event->isBackTab());
+ if (event->defaultHandled())
+ return;
+ }
+ 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();
+ }
+}
+
+void EventHandler::defaultTabEventHandler(Event* event, bool isBackTab)
+{
+ Page* page = m_frame->page();
+ // Tabs can be used in design mode editing. You can still move out with back tab.
+ if (!page || !page->tabKeyCyclesThroughElements() || (m_frame->document()->inDesignMode() && !isBackTab))
+ return;
+ FocusController* focus = page->focusController();
+ KeyboardEvent* keyboardEvent = findKeyboardEvent(event);
+ bool handled;
+ if (isBackTab)
+ handled = focus->advanceFocus(FocusDirectionBackward, keyboardEvent);
+ else
+ handled = focus->advanceFocus(keyboardEvent); // get direction from keyboard event
+ if (handled)
+ event->setDefaultHandled();
+}
+
+}