/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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.
*/
package com.android.gallery3d.ui;
import android.view.MotionEvent;
public class DownUpDetector {
public interface DownUpListener {
void onDown(MotionEvent e);
void onUp(MotionEvent e);
}
private boolean mStillDown;
private DownUpListener mListener;
public DownUpDetector(DownUpListener listener) {
mListener = listener;
}
private void setState(boolean down, MotionEvent e) {
if (down == mStillDown) return;
mStillDown = down;
if (down) {
mListener.onDown(e);
} else {
mListener.onUp(e);
}
}
public void onTouchEvent(MotionEvent ev) {
switch (ev.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
setState(true, ev);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_POINTER_DOWN: // Multitouch event - abort.
setState(false, ev);
break;
}
}
public boolean isDown() {
return mStillDown;
}
}