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.photoeditor.actions; 18 19 import android.content.Context; 20 import android.graphics.PointF; 21 import android.util.AttributeSet; 22 import android.view.GestureDetector; 23 import android.view.MotionEvent; 24 25 /** 26 * A view that detects user gestures and touch motions. 27 */ 28 class TouchView extends FullscreenToolView { 29 30 /** 31 * Listener of single tap on a point (relative to photo coordinates). 32 */ 33 public interface SingleTapListener { 34 onSingleTap(PointF point)35 void onSingleTap(PointF point); 36 } 37 38 private final GestureDetector gestureDetector; 39 private SingleTapListener singleTapListener; 40 TouchView(Context context, AttributeSet attrs)41 public TouchView(Context context, AttributeSet attrs) { 42 super(context, attrs); 43 44 gestureDetector = new GestureDetector( 45 context, new GestureDetector.SimpleOnGestureListener() { 46 47 @Override 48 public boolean onDown(MotionEvent e) { 49 // GestureDetector onTouchEvent returns true only for events whose preceding 50 // down-events have been consumed. 51 return true; 52 } 53 54 @Override 55 public boolean onSingleTapUp(MotionEvent e) { 56 if (singleTapListener != null) { 57 PointF point = new PointF(); 58 mapPhotoPoint(e.getX(), e.getY(), point); 59 singleTapListener.onSingleTap(point); 60 } 61 return true; 62 } 63 }); 64 gestureDetector.setIsLongpressEnabled(false); 65 } 66 setSingleTapListener(SingleTapListener listener)67 public void setSingleTapListener(SingleTapListener listener) { 68 singleTapListener = listener; 69 } 70 71 @Override onTouchEvent(MotionEvent event)72 public boolean onTouchEvent(MotionEvent event) { 73 return isEnabled() && gestureDetector.onTouchEvent(event); 74 } 75 } 76