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