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      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 {
     32         public void swapLeft(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 
     41     public SwapButton(Context context, AttributeSet attrs) {
     42         super(context, attrs);
     43         mDetector = new GestureDetector(context, this);
     44     }
     45 
     46     public SwapButtonListener getListener() {
     47         return mListener;
     48     }
     49 
     50     public void setListener(SwapButtonListener listener) {
     51         mListener = listener;
     52     }
     53 
     54     public boolean onTouchEvent(MotionEvent me) {
     55         if (!mDetector.onTouchEvent(me)) {
     56             return super.onTouchEvent(me);
     57         }
     58         return true;
     59     }
     60 
     61     @Override
     62     public boolean onDown(MotionEvent e) {
     63         return true;
     64     }
     65 
     66     @Override
     67     public void onShowPress(MotionEvent e) {
     68     }
     69 
     70     @Override
     71     public boolean onSingleTapUp(MotionEvent e) {
     72         callOnClick();
     73         return true;
     74     }
     75 
     76     @Override
     77     public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
     78         return false;
     79     }
     80 
     81     @Override
     82     public void onLongPress(MotionEvent e) {
     83     }
     84 
     85     @Override
     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