third_party/WebKit/Source/core/input/BoundaryEventDispatcher.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 BoundaryEventDispatcher_h
#define BoundaryEventDispatcher_h

#include "core/events/EventTarget.h"

namespace blink {

// This class contains the common logic of finding related node in a boundary
// crossing action and sending boundary events. The subclasses of this class
// must define what events should be sent in every case.
class BoundaryEventDispatcher {
    STACK_ALLOCATED()
public:
    BoundaryEventDispatcher() {}
    virtual ~BoundaryEventDispatcher() {}

    void sendBoundaryEvents(
        EventTarget* exitedTarget,
        EventTarget* enteredTarget);

protected:
    virtual void dispatchOut(EventTarget*, EventTarget* relatedTarget) = 0;
    virtual void dispatchOver(EventTarget*, EventTarget* relatedTarget) = 0;
    virtual void dispatchLeave(EventTarget*, EventTarget* relatedTarget, bool checkForListener) = 0;
    virtual void dispatchEnter(EventTarget*, EventTarget* relatedTarget, bool checkForListener) = 0;
    virtual AtomicString getLeaveEvent() = 0;
    virtual AtomicString getEnterEvent() = 0;
};

} // namespace blink

#endif // BoundaryEventDispatcher_h