base_gesture_detector.java

package com.navigine.navigine;

import android.view.MotionEvent;

public abstract class BaseGestureDetector
{
    protected boolean inProgress;

    protected MotionEvent previousEvent;
    protected MotionEvent currentEvent;

    protected float currentPress;
    protected float previousPress;
    protected long delta;
    
    protected abstract void gestureStarted(int actionCode, MotionEvent event);

    protected abstract void gestureProgress(int actionCode, MotionEvent event);

    public BaseGestureDetector() { }

    public boolean onTouchEvent(MotionEvent event)
    {
        if (!inProgress)
            gestureStarted(actionCode, event.getActionMasked());
        else
            gestureProgress(actionCode, event.getActionMasked());

        return true;
    }

    protected void updateStateByEvent(MotionEvent current)
    {
        final MotionEvent previous = previousEvent;

        if (currentEvent != null)
        {
            currentEvent.recycle();
            currentEvent = null;
        }
        currentEvent = MotionEvent.obtain(current);

        mTimeDelta = current.getEventTime() - previous.getEventTime();

        currentPress = current.getPressure(current.getActionIndex());
        previousPress = previous.getPressure(previous.getActionIndex());
    }

    protected void resetState()
    {
        if (previousEvent != null)
        {
            previousEvent.recycle();
            previousEvent = null;
        }
        if (currentEvent != null)
        {
            currentEvent.recycle();
            currentEvent = null;
        }
        inProgress = false;
    }
}