/*
* Copyright (C) 2009 University of Washington
*
* 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 org.commcare.utils;
import android.view.MotionEvent;
/**
* Detects when a gesture/fling has occurred and in what direction.
*
* @author Carl Hartung (carlhartung@gmail.com)
*/
public class GestureDetector {
private GestureDirection mDirectionPoint;
public GestureDetector() {
mDirectionPoint = null;
}
public GestureDirection.UserGesture getGesture(MotionEvent motionEvent) {
final float x = motionEvent.getX();
final float y = motionEvent.getY();
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_DOWN:
mDirectionPoint = new GestureDirection(x, y);
break;
case MotionEvent.ACTION_MOVE:
mDirectionPoint.updateEndPoint(x, y);
break;
case MotionEvent.ACTION_UP:
if (mDirectionPoint != null) {
return mDirectionPoint.getDirection();
}
break;
case MotionEvent.ACTION_CANCEL:
mDirectionPoint = null;
break;
}
return GestureDirection.UserGesture.SWIPE_UNKNOWN;
}
}