1 /* 2 * Copyright (C) 2013 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.filtershow.editors; 18 19 import android.content.Context; 20 import android.util.AttributeSet; 21 import android.view.GestureDetector; 22 import android.view.Menu; 23 import android.view.MenuItem; 24 import android.view.MotionEvent; 25 import android.widget.Button; 26 27 public class SwapButton extends Button implements GestureDetector.OnGestureListener { 28 29 public static int ANIM_DURATION = 200; 30 31 public interface SwapButtonListener { swapLeft(MenuItem item)32 public void swapLeft(MenuItem item); swapRight(MenuItem item)33 public void swapRight(MenuItem item); 34 } 35 36 private GestureDetector mDetector; 37 private SwapButtonListener mListener; 38 private Menu mMenu; 39 private int mCurrentMenuIndex; 40 SwapButton(Context context, AttributeSet attrs)41 public SwapButton(Context context, AttributeSet attrs) { 42 super(context, attrs); 43 mDetector = new GestureDetector(context, this); 44 } 45 getListener()46 public SwapButtonListener getListener() { 47 return mListener; 48 } 49 setListener(SwapButtonListener listener)50 public void setListener(SwapButtonListener listener) { 51 mListener = listener; 52 } 53 onTouchEvent(MotionEvent me)54 public boolean onTouchEvent(MotionEvent me) { 55 if (!mDetector.onTouchEvent(me)) { 56 return super.onTouchEvent(me); 57 } 58 return true; 59 } 60 61 @Override onDown(MotionEvent e)62 public boolean onDown(MotionEvent e) { 63 return true; 64 } 65 66 @Override onShowPress(MotionEvent e)67 public void onShowPress(MotionEvent e) { 68 } 69 70 @Override onSingleTapUp(MotionEvent e)71 public boolean onSingleTapUp(MotionEvent e) { 72 callOnClick(); 73 return true; 74 } 75 76 @Override onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)77 public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { 78 return false; 79 } 80 81 @Override onLongPress(MotionEvent e)82 public void onLongPress(MotionEvent e) { 83 } 84 85 @Override onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)86 public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { 87 if (mMenu == null) { 88 return false; 89 } 90 if (e1.getX() - e2.getX() > 0) { 91 // right to left 92 mCurrentMenuIndex++; 93 if (mCurrentMenuIndex == mMenu.size()) { 94 mCurrentMenuIndex = 0; 95 } 96 if (mListener != null) { 97 mListener.swapRight(mMenu.getItem(mCurrentMenuIndex)); 98 } 99 } else { 100 // left to right 101 mCurrentMenuIndex--; 102 if (mCurrentMenuIndex < 0) { 103 mCurrentMenuIndex = mMenu.size() - 1; 104 } 105 if (mListener != null) { 106 mListener.swapLeft(mMenu.getItem(mCurrentMenuIndex)); 107 } 108 } 109 return true; 110 } 111 } 112