external/webkit r30707

1 files changed, 1866 insertions, 0 deletions

diff --git a/WebCore/page/EventHandler.cpp b/WebCore/page/EventHandler.cpp
new file mode 100644
index 0000000..adb4086
--- /dev/null
+++ b/WebCore/page/EventHandler.cpp
@@ -0,0 +1,1866 @@
+/*
+ * Copyright (C) 2006, 2007, 2008 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 "SVGDocument.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);
+    }
+}
+
+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->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, 0, 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)
+{
+    // 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 (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);
+
+    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;
+        FrameView* view = static_cast<FrameView*>(widget);
+        IntPoint widgetPoint(result.localPoint().x() + view->contentsX() - n->renderer()->borderLeft() - n->renderer()->paddingLeft(), 
+            result.localPoint().y() + view->contentsY() - n->renderer()->borderTop() - n->renderer()->paddingTop());
+        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 (!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()) {
+        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);
+
+        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 = m_mousePressed ? 0 : 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;
+        static_cast<SVGDocument*>(m_frame->document())->updatePan(m_currentMousePosition);
+        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)
+        swallowClickEvent = dispatchMouseEvent(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 = 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);
+    }
+    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(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
+}
+
+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();
+    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;
+    
+    // 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
+        selectClosestWordOrLinkFromMouseEvent(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::resizeLayerDestroyed()
+{
+    ASSERT(m_resizeLayer);
+    m_resizeLayer = 0;
+}
+
+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::handleAccessKey(const PlatformKeyboardEvent& evt)
+{
+#if PLATFORM(MAC) || PLATFORM(QT)
+    if (evt.ctrlKey())
+#else
+    if (evt.altKey())
+#endif
+    {
+        String key = evt.unmodifiedText();
+        Element* elem = m_frame->document()->getElementByAccessKey(key.lower());
+        if (elem) {
+            elem->accessKeyAction(false);
+            return true;
+        }
+    }
+
+    return false;
+}
+
+#if !PLATFORM(MAC)
+bool EventHandler::needsKeyboardEventDisambiguationQuirks() const
+{
+    return false;
+}
+#endif
+
+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.
+    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 = new KeyboardEvent(keyDownEvent, m_frame->document()->defaultView());
+    if (matchedAnAccessKey)
+        keydown->setDefaultPrevented(true);
+    keydown->setTarget(node);
+
+    if (initialKeyEvent.type() == PlatformKeyboardEvent::RawKeyDown) {
+        node->dispatchEvent(keydown, ec, true);
+        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 = new KeyboardEvent(keyDownEvent, m_frame->document()->defaultView());
+        keydown->setTarget(node);
+        keydown->setDefaultHandled();
+    }
+
+    node->dispatchEvent(keydown, ec, true);
+    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 = new KeyboardEvent(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, true);
+
+    return keydownResult || keypress->defaultPrevented() || keypress->defaultHandled();
+}
+
+void EventHandler::defaultKeyboardEventHandler(KeyboardEvent* event)
+{
+   if (event->type() == keydownEvent) {
+        m_frame->editor()->handleKeyboardEvent(event);
+        if (event->defaultHandled())
+            return;
+        if (event->keyIdentifier() == "U+0009")
+            defaultTabEventHandler(event);
+   }
+   if (event->type() == keypressEvent) {
+        m_frame->editor()->handleKeyboardEvent(event);
+        if (event->defaultHandled())
+            return;
+   }
+}
+
+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;
+#ifndef NDEBUG
+    // Platforms should differentiate real commands like selectAll from text input in disguise (like insertNewline),
+    // and avoid dispatching text input events from keydown default handlers.
+    if (underlyingEvent && underlyingEvent->isKeyboardEvent())
+        ASSERT(static_cast<KeyboardEvent*>(underlyingEvent)->type() == keypressEvent);
+#endif
+    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 == "\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(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();
+} 
+
+}