Canvas2d: Implement rerouting event by hit region's control.

third_party/WebKit/Source/core/events/MouseEvent.h

 /*
  * 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, 2004, 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 31 matching lines @@
         return adoptRefWillBeNoop(new MouseEvent);
     }
 
     // TODO(mustaq): Should replace most/all of these params with a MouseEventInit.
     static PassRefPtrWillBeRawPtr<MouseEvent> create(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView>,
         int detail, int screenX, int screenY, int windowX, int windowY,
         int movementX, int movementY, PlatformEvent::Modifiers,
         short button, unsigned short buttons,
         PassRefPtrWillBeRawPtr<EventTarget> relatedTarget,
         double platformTimeStamp,
-        PlatformMouseEvent::SyntheticEventType = PlatformMouseEvent::RealOrIndistinguishable);
+        PlatformMouseEvent::SyntheticEventType = PlatformMouseEvent::RealOrIndistinguishable,
+        const String& region = String());
 
     static PassRefPtrWillBeRawPtr<MouseEvent> create(const AtomicString& eventType, PassRefPtrWillBeRawPtr<AbstractView>, const PlatformMouseEvent&, int detail, PassRefPtrWillBeRawPtr<Node> relatedTarget);
 
     static PassRefPtrWillBeRawPtr<MouseEvent> create(ScriptState*, const AtomicString& eventType, const MouseEventInit&);
 
     static PassRefPtrWillBeRawPtr<MouseEvent> create(const AtomicString& eventType, PassRefPtrWillBeRawPtr<AbstractView>, PassRefPtrWillBeRawPtr<Event> underlyingEvent, SimulatedClickCreationScope);
 
     ~MouseEvent() override;
 
     static unsigned short platformModifiersToButtons(unsigned modifiers);
     static unsigned short buttonToButtons(short button);
 
     void initMouseEvent(ScriptState*, const AtomicString& type, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView>,
         int detail, int screenX, int screenY, int clientX, int clientY,
         bool ctrlKey, bool altKey, bool shiftKey, bool metaKey,
         short button, PassRefPtrWillBeRawPtr<EventTarget> relatedTarget, unsigned short buttons = 0);
 
     // WinIE uses 1,4,2 for left/middle/right but not for click (just for mousedown/up, maybe others),
     // but we will match the standard DOM.
     virtual short button() const { return m_button == -1 ? 0 : m_button; }
     unsigned short buttons() const { return m_buttons; }
     bool buttonDown() const { return m_button != -1; }
     EventTarget* relatedTarget() const { return m_relatedTarget.get(); }
     void setRelatedTarget(PassRefPtrWillBeRawPtr<EventTarget> relatedTarget) { m_relatedTarget = relatedTarget; }
     PlatformMouseEvent::SyntheticEventType syntheticEventType() const { return m_syntheticEventType; }
+    const String& region() const { return m_region; }
+    void setRegion(const String& region) { m_region = region; }
 
     Node* toElement() const;
     Node* fromElement() const;
 
     virtual DataTransfer* dataTransfer() const { return nullptr; }
 
     bool fromTouch() const { return m_syntheticEventType == PlatformMouseEvent::FromTouch; }
 
     const AtomicString& interfaceName() const override;
 
@@ skipping 11 matching lines @@
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     MouseEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView>,
         int detail, int screenX, int screenY, int windowX, int windowY,
         int movementX, int movementY,
         PlatformEvent::Modifiers, short button, unsigned short buttons,
         PassRefPtrWillBeRawPtr<EventTarget> relatedTarget,
         double platformTimeStamp,
-        PlatformMouseEvent::SyntheticEventType);
+        PlatformMouseEvent::SyntheticEventType,
+        const String& region = String());

[philipj_slow, 2016/02/15 10:45:24]

Is the default needed? Update callers?

[zino, 2016/03/08 12:33:48]

Done.

 
     MouseEvent(const AtomicString& type, const MouseEventInit&);
 
     MouseEvent();
 
     short rawButton() const { return m_button; }
 
 private:
     friend class MouseEventDispatchMediator;
     void initMouseEventInternal(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView>,
         int detail, int screenX, int screenY, int clientX, int clientY,
         PlatformEvent::Modifiers,
         short button, PassRefPtrWillBeRawPtr<EventTarget> relatedTarget, InputDeviceCapabilities* sourceCapabilities, unsigned short buttons = 0);
 
     short m_button;
     unsigned short m_buttons;
     RefPtrWillBeMember<EventTarget> m_relatedTarget;
     PlatformMouseEvent::SyntheticEventType m_syntheticEventType;
+    String m_region;
 };
 
 class MouseEventDispatchMediator final : public EventDispatchMediator {
 public:
     static PassRefPtrWillBeRawPtr<MouseEventDispatchMediator> create(PassRefPtrWillBeRawPtr<MouseEvent>);
 
 private:
     explicit MouseEventDispatchMediator(PassRefPtrWillBeRawPtr<MouseEvent>);
     MouseEvent& event() const;
 
     bool dispatchEvent(EventDispatcher&) const override;
 };
 
 DEFINE_EVENT_TYPE_CASTS(MouseEvent);
 
 } // namespace blink
 
 #endif // MouseEvent_h