Chih-Chung Chang | 762f8e2 | 2012-03-14 17:39:42 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 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.content.Context; |
Chih-Chung Chang | 95860d2 | 2012-03-21 19:01:30 +0800 | [diff] [blame] | 20 | import android.os.SystemClock; |
Chih-Chung Chang | 762f8e2 | 2012-03-14 17:39:42 +0800 | [diff] [blame] | 21 | import android.view.GestureDetector; |
| 22 | import android.view.MotionEvent; |
| 23 | import android.view.ScaleGestureDetector; |
| 24 | |
| 25 | // This class aggregates three gesture detectors: GestureDetector, |
| 26 | // ScaleGestureDetector, and DownUpDetector. |
| 27 | public class GestureRecognizer { |
| 28 | private static final String TAG = "GestureRecognizer"; |
| 29 | |
| 30 | public interface Listener { |
| 31 | boolean onSingleTapUp(float x, float y); |
| 32 | boolean onDoubleTap(float x, float y); |
| 33 | boolean onScroll(float dx, float dy); |
| 34 | boolean onFling(float velocityX, float velocityY); |
| 35 | boolean onScaleBegin(float focusX, float focusY); |
| 36 | boolean onScale(float focusX, float focusY, float scale); |
| 37 | void onScaleEnd(); |
| 38 | void onDown(); |
| 39 | void onUp(); |
| 40 | } |
| 41 | |
| 42 | private final GestureDetector mGestureDetector; |
| 43 | private final ScaleGestureDetector mScaleDetector; |
| 44 | private final DownUpDetector mDownUpDetector; |
| 45 | private final Listener mListener; |
| 46 | |
| 47 | public GestureRecognizer(Context context, Listener listener) { |
| 48 | mListener = listener; |
| 49 | mGestureDetector = new GestureDetector(context, new MyGestureListener(), |
| 50 | null, true /* ignoreMultitouch */); |
| 51 | mScaleDetector = new ScaleGestureDetector( |
| 52 | context, new MyScaleListener()); |
| 53 | mDownUpDetector = new DownUpDetector(new MyDownUpListener()); |
| 54 | } |
| 55 | |
| 56 | public void onTouchEvent(MotionEvent event) { |
| 57 | mGestureDetector.onTouchEvent(event); |
| 58 | mScaleDetector.onTouchEvent(event); |
| 59 | mDownUpDetector.onTouchEvent(event); |
| 60 | } |
| 61 | |
| 62 | public boolean isDown() { |
| 63 | return mDownUpDetector.isDown(); |
| 64 | } |
| 65 | |
Chih-Chung Chang | 95860d2 | 2012-03-21 19:01:30 +0800 | [diff] [blame] | 66 | public void cancelScale() { |
| 67 | long now = SystemClock.uptimeMillis(); |
| 68 | MotionEvent cancelEvent = MotionEvent.obtain( |
| 69 | now, now, MotionEvent.ACTION_CANCEL, 0, 0, 0); |
| 70 | mScaleDetector.onTouchEvent(cancelEvent); |
| 71 | cancelEvent.recycle(); |
| 72 | } |
| 73 | |
Chih-Chung Chang | 762f8e2 | 2012-03-14 17:39:42 +0800 | [diff] [blame] | 74 | private class MyGestureListener |
| 75 | extends GestureDetector.SimpleOnGestureListener { |
| 76 | @Override |
| 77 | public boolean onSingleTapUp(MotionEvent e) { |
| 78 | return mListener.onSingleTapUp(e.getX(), e.getY()); |
| 79 | } |
| 80 | |
| 81 | @Override |
| 82 | public boolean onDoubleTap(MotionEvent e) { |
| 83 | return mListener.onDoubleTap(e.getX(), e.getY()); |
| 84 | } |
| 85 | |
| 86 | @Override |
| 87 | public boolean onScroll( |
| 88 | MotionEvent e1, MotionEvent e2, float dx, float dy) { |
| 89 | return mListener.onScroll(dx, dy); |
| 90 | } |
| 91 | |
| 92 | @Override |
| 93 | public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, |
| 94 | float velocityY) { |
| 95 | return mListener.onFling(velocityX, velocityY); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | private class MyScaleListener |
| 100 | extends ScaleGestureDetector.SimpleOnScaleGestureListener { |
| 101 | @Override |
| 102 | public boolean onScaleBegin(ScaleGestureDetector detector) { |
| 103 | return mListener.onScaleBegin( |
| 104 | detector.getFocusX(), detector.getFocusY()); |
| 105 | } |
| 106 | |
| 107 | @Override |
| 108 | public boolean onScale(ScaleGestureDetector detector) { |
| 109 | return mListener.onScale(detector.getFocusX(), |
| 110 | detector.getFocusY(), detector.getScaleFactor()); |
| 111 | } |
| 112 | |
| 113 | @Override |
| 114 | public void onScaleEnd(ScaleGestureDetector detector) { |
| 115 | mListener.onScaleEnd(); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | private class MyDownUpListener implements DownUpDetector.DownUpListener { |
| 120 | @Override |
| 121 | public void onDown(MotionEvent e) { |
| 122 | mListener.onDown(); |
| 123 | } |
| 124 | |
| 125 | @Override |
| 126 | public void onUp(MotionEvent e) { |
| 127 | mListener.onUp(); |
| 128 | } |
| 129 | } |
| 130 | } |