1 /* 2 * Copyright (C) 2016 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.documentsui.selection; 18 19 import static android.support.v4.util.Preconditions.checkNotNull; 20 21 import android.support.annotation.Nullable; 22 import android.view.GestureDetector.OnDoubleTapListener; 23 import android.view.GestureDetector.OnGestureListener; 24 import android.view.GestureDetector.SimpleOnGestureListener; 25 import android.view.MotionEvent; 26 27 /** 28 * GestureRouter is responsible for routing gestures detected by a GestureDetector 29 * to registered handlers. The primary function is to divide events by tool-type 30 * allowing handlers to cleanly implement tool-type specific policies. 31 */ 32 public final class GestureRouter<T extends OnGestureListener & OnDoubleTapListener> 33 implements OnGestureListener, OnDoubleTapListener { 34 35 private final ToolHandlerRegistry<T> mDelegates; 36 GestureRouter(T defaultDelegate)37 public GestureRouter(T defaultDelegate) { 38 checkNotNull(defaultDelegate); 39 mDelegates = new ToolHandlerRegistry<>(defaultDelegate); 40 } 41 GestureRouter()42 public GestureRouter() { 43 this((T) new SimpleOnGestureListener()); 44 } 45 46 /** 47 * @param toolType 48 * @param delegate the delegate, or null to unregister. 49 */ register(int toolType, @Nullable T delegate)50 public void register(int toolType, @Nullable T delegate) { 51 mDelegates.set(toolType, delegate); 52 } 53 54 @Override onSingleTapConfirmed(MotionEvent e)55 public boolean onSingleTapConfirmed(MotionEvent e) { 56 return mDelegates.get(e).onSingleTapConfirmed(e); 57 } 58 59 @Override onDoubleTap(MotionEvent e)60 public boolean onDoubleTap(MotionEvent e) { 61 return mDelegates.get(e).onDoubleTap(e); 62 } 63 64 @Override onDoubleTapEvent(MotionEvent e)65 public boolean onDoubleTapEvent(MotionEvent e) { 66 return mDelegates.get(e).onDoubleTapEvent(e); 67 } 68 69 @Override onDown(MotionEvent e)70 public boolean onDown(MotionEvent e) { 71 return mDelegates.get(e).onDown(e); 72 } 73 74 @Override onShowPress(MotionEvent e)75 public void onShowPress(MotionEvent e) { 76 mDelegates.get(e).onShowPress(e); 77 } 78 79 @Override onSingleTapUp(MotionEvent e)80 public boolean onSingleTapUp(MotionEvent e) { 81 return mDelegates.get(e).onSingleTapUp(e); 82 } 83 84 @Override onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)85 public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { 86 return mDelegates.get(e2).onScroll(e1, e2, distanceX, distanceY); 87 } 88 89 @Override onLongPress(MotionEvent e)90 public void onLongPress(MotionEvent e) { 91 mDelegates.get(e).onLongPress(e); 92 } 93 94 @Override onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)95 public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { 96 return mDelegates.get(e2).onFling(e1, e2, velocityX, velocityY); 97 } 98 } 99