EventThrottler.h

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/* @@@LICENSE
*
*      Copyright (c) 2008-2012 Hewlett-Packard Development Company, L.P.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* LICENSE@@@ */




#ifndef __EventThrottler_h__
#define __EventThrottler_h__

#include "Common.h"

#include "Event.h"

class QEvent;
class QTouchEvent;

class EventThrottler
{
public:
        EventThrottler();
        ~EventThrottler();

        static EventThrottler* instance();

        bool shouldDropEvent(Event* e);
        bool shouldDropEvent(QEvent* e);

private:
        bool m_penTracking;

        uint32_t m_lastPostedPenMoveTime;
        uint32_t m_lastPostedPenDownTime;
        int m_lastPostedPenMoveX;
        int m_lastPostedPenMoveY;

        int m_lastPostedGestureChangeX;
        int m_lastPostedGestureChangeY;
        uint32_t m_lastPostedGestureChangeTime;

    bool m_touchTracking;

    uint32_t m_lastPostedTouchDownTime;
        uint32_t m_lastPostedTouchUpdateTime;

        void updatePenLocation(Event* e);
    void updateTouchLocation(QTouchEvent* e);
        bool shouldDropMove(Event* e);
        bool shouldDropGestureChange(Event* e);
        bool shouldDropTouchEvent(QTouchEvent* e);
};

#endif  // __EventThrottler_h__