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1 /*
2 * Copyright 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 
18 
19 
20 package com.example.android.batchstepsensor.cardstream;
21 
22 import android.content.Context;
23 import android.util.AttributeSet;
24 import android.view.MotionEvent;
25 import android.view.ViewConfiguration;
26 import android.widget.RelativeLayout;
27 
28 /**
29  * Custom Button with a special 'pressed' effect for touch events.
30  */
31 public class CardLayout extends RelativeLayout {
32 
33     private boolean mSwiping = false;
34     private float mDownX = 0.f;
35     private float mDownY = 0.f;
36     private float mTouchSlop = 0.f;
37 
CardLayout(Context context)38     public CardLayout(Context context) {
39         super(context);
40         init();
41     }
42 
CardLayout(Context context, AttributeSet attrs)43     public CardLayout(Context context, AttributeSet attrs) {
44         super(context, attrs);
45         init();
46     }
47 
CardLayout(Context context, AttributeSet attrs, int defStyle)48     public CardLayout(Context context, AttributeSet attrs, int defStyle) {
49         super(context, attrs, defStyle);
50         init();
51     }
52 
init()53     private void init(){
54         setFocusable(true);
55         setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
56         setWillNotDraw(false);
57         setClickable(true);
58 
59         mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop() * 2.f;
60     }
61 
62     @Override
onTouchEvent(MotionEvent event)63     public boolean onTouchEvent(MotionEvent event) {
64         switch(event.getAction()){
65             case MotionEvent.ACTION_CANCEL:
66             case MotionEvent.ACTION_UP:
67                 mSwiping = false;
68                 break;
69         }
70         return super.onTouchEvent(event);
71     }
72 
73     @Override
onInterceptTouchEvent(MotionEvent event)74     public boolean onInterceptTouchEvent(MotionEvent event) {
75 
76         switch(event.getAction()){
77             case MotionEvent.ACTION_MOVE:
78                 if( !mSwiping ){
79                     mSwiping = Math.abs(mDownX - event.getX()) > mTouchSlop;
80                 }
81                 break;
82             case MotionEvent.ACTION_DOWN:
83                 mDownX = event.getX();
84                 mDownY = event.getY();
85                 mSwiping = false;
86                 break;
87             case MotionEvent.ACTION_CANCEL:
88             case MotionEvent.ACTION_UP:
89                 mSwiping = false;
90                 break;
91         }
92         return mSwiping;
93     }
94 }