Create MouseEventManager and EventHandlingUtil

third_party/WebKit/Source/core/input/MouseEventManager.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MouseEventManager_h
+#define MouseEventManager_h
+
+#include "core/CoreExport.h"
+#include "core/frame/LocalFrame.h"
+#include "core/input/BoundaryEventDispatcher.h"
+#include "platform/PlatformMouseEvent.h"
+#include "public/platform/WebInputEventResult.h"
+#include "wtf/Allocator.h"
+
+namespace blink {
+
+class LocalFrame;
+
+// This class takes care of dispatching all pointer events and keeps track of
+// properties of active pointer events.

[bokan, 2016/09/01 13:50:13]

Is "pointer events" here related to actual PointerEvents? If not, could you
reword this to avoid potential confusion?

[Navid Zolghadr, 2016/09/01 17:07:27]

Done.

+class CORE_EXPORT MouseEventManager {
+    WTF_MAKE_NONCOPYABLE(MouseEventManager);
+    DISALLOW_NEW();
+
+public:
+    explicit MouseEventManager(LocalFrame*);
+    ~MouseEventManager();
+    DECLARE_TRACE();
+
+    WebInputEventResult dispatchMouseEvent(
+        EventTarget*, const AtomicString&, const PlatformMouseEvent&,
+        EventTarget* relatedTarget, int detail = 0,
+        bool checkForListener = false);
+
+    // Resets the internal state of this object.
+    void clear();
+
+    void sendBoundaryEvents(
+        EventTarget* exitedTarget,
+        EventTarget* enteredTarget,
+        const PlatformMouseEvent& mousePlatformEvent);
+
+private:
+    class MouseEventBoundaryEventDispatcher : public BoundaryEventDispatcher {
+        WTF_MAKE_NONCOPYABLE(MouseEventBoundaryEventDispatcher);
+        DISALLOW_NEW();
+
+    public:
+        DEFINE_INLINE_TRACE()
+        {
+            visitor->trace(m_exitedTarget);
+            BoundaryEventDispatcher::trace(visitor);
+        }
+        MouseEventBoundaryEventDispatcher(MouseEventManager*,
+            const PlatformMouseEvent&, EventTarget* exitedTarget);
+
+    protected:
+        virtual void dispatchOut(EventTarget*, EventTarget* relatedTarget);
+        virtual void dispatchOver(EventTarget*, EventTarget* relatedTarget);
+        virtual void dispatchLeave(EventTarget*, EventTarget* relatedTarget, bool checkForListener);
+        virtual void dispatchEnter(EventTarget*, EventTarget* relatedTarget, bool checkForListener);
+        virtual AtomicString getLeaveEvent();
+        virtual AtomicString getEnterEvent();
+
+    private:
+        void dispatch(EventTarget*, EventTarget* relatedTarget,
+            const AtomicString&, const PlatformMouseEvent&,
+            bool checkForListener);
+        MouseEventManager* m_mouseEventManager;
+        PlatformMouseEvent m_platformMouseEvent;

[bokan, 2016/09/01 13:50:13]

Is there a reason we have to copy the PlatformMouseEvent?

[Navid Zolghadr, 2016/09/01 14:30:41]

I can keep a pointer to that. Do you think that is better?

[bokan, 2016/09/01 16:00:54]

Yah, lets avoid copying unless we need it.

[Navid Zolghadr, 2016/09/01 17:07:27]

Done.

+        Member<EventTarget> m_exitedTarget;
+    };
+
+    // NOTE: If adding a new field to this class please ensure that it is
+    // cleared in |MouseEventManager::clear()|.
+
+    const Member<LocalFrame> m_frame;
+
+    // The effective position of the mouse pointer.
+    // See https://w3c.github.io/pointerevents/#dfn-tracking-the-effective-position-of-the-legacy-mouse-pointer.
+    Member<Node> m_nodeUnderMouse;
+};
+
+} // namespace blink
+
+#endif // MouseEventManager_h