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 mouse events and keeps track of
+// positions and states of mouse.
+class CORE_EXPORT MouseEventManager : public GarbageCollectedFinalized<MouseEventManager> {
+    WTF_MAKE_NONCOPYABLE(MouseEventManager);
+
+public:
+    explicit MouseEventManager(LocalFrame*);
+    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);
+
+    public:
+        MouseEventBoundaryEventDispatcher(MouseEventManager*,
+            const PlatformMouseEvent*, EventTarget* exitedTarget);
+
+    protected:
+        void dispatchOut(EventTarget*, EventTarget* relatedTarget) override;
+        void dispatchOver(EventTarget*, EventTarget* relatedTarget) override;
+        void dispatchLeave(EventTarget*, EventTarget* relatedTarget, bool checkForListener) override;
+        void dispatchEnter(EventTarget*, EventTarget* relatedTarget, bool checkForListener) override;
+        AtomicString getLeaveEvent() override;
+        AtomicString getEnterEvent() override;
+
+    private:
+        void dispatch(EventTarget*, EventTarget* relatedTarget,
+            const AtomicString&, const PlatformMouseEvent&,
+            bool checkForListener);
+        Member<MouseEventManager> m_mouseEventManager;
+        const PlatformMouseEvent* m_platformMouseEvent;
+        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