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