1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.gallery3d.ui; 18 19 import android.view.MotionEvent; 20 21 public class DownUpDetector { 22 public interface DownUpListener { 23 void onDown(MotionEvent e); 24 void onUp(MotionEvent e); 25 } 26 27 private boolean mStillDown; 28 private DownUpListener mListener; 29 30 public DownUpDetector(DownUpListener listener) { 31 mListener = listener; 32 } 33 34 private void setState(boolean down, MotionEvent e) { 35 if (down == mStillDown) return; 36 mStillDown = down; 37 if (down) { 38 mListener.onDown(e); 39 } else { 40 mListener.onUp(e); 41 } 42 } 43 44 public void onTouchEvent(MotionEvent ev) { 45 switch (ev.getAction() & MotionEvent.ACTION_MASK) { 46 case MotionEvent.ACTION_DOWN: 47 setState(true, ev); 48 break; 49 50 case MotionEvent.ACTION_UP: 51 case MotionEvent.ACTION_CANCEL: 52 case MotionEvent.ACTION_POINTER_DOWN: // Multitouch event - abort. 53 setState(false, ev); 54 break; 55 } 56 } 57 58 public boolean isDown() { 59 return mStillDown; 60 } 61 } 62
