1f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin/* 2f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * Copyright (C) 2010 The Android Open Source Project 3f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * 4f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * Licensed under the Apache License, Version 2.0 (the "License"); 5f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * you may not use this file except in compliance with the License. 6f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * You may obtain a copy of the License at 7f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * 8f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * http://www.apache.org/licenses/LICENSE-2.0 9f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * 10f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * Unless required by applicable law or agreed to in writing, software 11f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * distributed under the License is distributed on an "AS IS" BASIS, 12f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * See the License for the specific language governing permissions and 14f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin * limitations under the License. 15f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin */ 16f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin 17f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Linpackage com.android.gallery3d.ui; 18f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin 19f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Linimport android.view.MotionEvent; 20f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin 21f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Linpublic class DownUpDetector { 22f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin public interface DownUpListener { 23f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin void onDown(MotionEvent e); 24f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin void onUp(MotionEvent e); 25f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin } 26f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin 27f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin private boolean mStillDown; 28f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin private DownUpListener mListener; 29f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin 30f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin public DownUpDetector(DownUpListener listener) { 31f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin mListener = listener; 32f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin } 33f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin 34f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin private void setState(boolean down, MotionEvent e) { 35f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin if (down == mStillDown) return; 36f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin mStillDown = down; 37f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin if (down) { 38f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin mListener.onDown(e); 39f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin } else { 40f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin mListener.onUp(e); 41f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin } 42f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin } 43f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin 44f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin public void onTouchEvent(MotionEvent ev) { 45f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin switch (ev.getAction() & MotionEvent.ACTION_MASK) { 46f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin case MotionEvent.ACTION_DOWN: 47f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin setState(true, ev); 48f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin break; 49f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin 50f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin case MotionEvent.ACTION_UP: 51f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin case MotionEvent.ACTION_CANCEL: 52f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin case MotionEvent.ACTION_POINTER_DOWN: // Multitouch event - abort. 53f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin setState(false, ev); 54f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin break; 55f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin } 56f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin } 57f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin 58f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin public boolean isDown() { 59f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin return mStillDown; 60f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin } 61f9a0a4306d589b4a4e20554fed512a603426bfa1Owen Lin} 62