Implement 'mouseenter' and 'mouseleave' from DOM Level 3 Events.

Source/core/dom/MouseEvent.cpp

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 39 matching lines @@
 
 PassRefPtr<MouseEvent> MouseEvent::create(const AtomicString& type, const MouseEventInit& initializer)
 {
     return adoptRef(new MouseEvent(type, initializer));
 }
 
 PassRefPtr<MouseEvent> MouseEvent::create(const AtomicString& eventType, PassRefPtr<AbstractView> view, const PlatformMouseEvent& event, int detail, PassRefPtr<Node> relatedTarget)
 {
     ASSERT(event.type() == PlatformEvent::MouseMoved || event.button() != NoButton);
 
-    bool isCancelable = eventType != eventNames().mousemoveEvent;
+    bool isMouseEnterOrLeave = eventType == eventNames().mouseenterEvent || eventType == eventNames().mouseleaveEvent;
+    bool isCancelable = eventType != eventNames().mousemoveEvent && !isMouseEnterOrLeave;
+    bool isBubbling = !isMouseEnterOrLeave;
 
-    return MouseEvent::create(eventType, true, isCancelable, view,
+    return MouseEvent::create(eventType, isBubbling, isCancelable, view,
         detail, event.globalPosition().x(), event.globalPosition().y(), event.position().x(), event.position().y(),
         event.movementDelta().x(), event.movementDelta().y(),
         event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(), event.button(),
         relatedTarget, 0, false);
 }
 
 PassRefPtr<MouseEvent> MouseEvent::create(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtr<AbstractView> view,
     int detail, int screenX, int screenY, int pageX, int pageY,
     int movementX, int movementY,
     bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button,
@@ skipping 109 matching lines @@
     // For the Netscape "which" property, the return values for left, middle and right mouse buttons are 1, 2, 3, respectively. 
     // So we must add 1.
     if (!m_buttonDown)
         return 0;
     return m_button + 1;
 }
 
 Node* MouseEvent::toElement() const
 {
     // MSIE extension - "the object toward which the user is moving the mouse pointer"
-    if (type() == eventNames().mouseoutEvent) 
+    if (type() == eventNames().mouseoutEvent || type() == eventNames().mouseleaveEvent)
         return relatedTarget() ? relatedTarget()->toNode() : 0;
-    
+
     return target() ? target()->toNode() : 0;
 }
 
 Node* MouseEvent::fromElement() const
 {
     // MSIE extension - "object from which activation or the mouse pointer is exiting during the event" (huh?)
-    if (type() != eventNames().mouseoutEvent)
+    if (type() != eventNames().mouseoutEvent && type() != eventNames().mouseleaveEvent)
         return relatedTarget() ? relatedTarget()->toNode() : 0;
-    
+
     return target() ? target()->toNode() : 0;
 }
 
 PassRefPtr<SimulatedMouseEvent> SimulatedMouseEvent::create(const AtomicString& eventType, PassRefPtr<AbstractView> view, PassRefPtr<Event> underlyingEvent)
 {
     return adoptRef(new SimulatedMouseEvent(eventType, view, underlyingEvent));
 }
 
 SimulatedMouseEvent::~SimulatedMouseEvent()
 {
@@ skipping 68 matching lines @@
                                      event()->button(), relatedTarget);
     if (event()->defaultHandled())
         doubleClickEvent->setDefaultHandled();
     EventDispatcher::dispatchEvent(dispatcher->node(), MouseEventDispatchMediator::create(doubleClickEvent));
     if (doubleClickEvent->defaultHandled() || doubleClickEvent->defaultPrevented())
         return false;
     return !swallowEvent;
 }
 
 } // namespace WebCore