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      1 /**
      2  * Copyright (C) 2014 Google Inc.
      3  * Licensed to The Android Open Source Project.
      4  *
      5  * Licensed under the Apache License, Version 2.0 (the "License");
      6  * you may not use this file except in compliance with the License.
      7  * You may obtain a copy of the License at
      8  *
      9  *      http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  */
     17 package com.android.mail.ui;
     18 
     19 import android.content.Context;
     20 import android.os.SystemClock;
     21 import android.support.annotation.NonNull;
     22 import android.util.AttributeSet;
     23 import android.view.MotionEvent;
     24 import android.view.ViewConfiguration;
     25 import android.widget.FrameLayout;
     26 
     27 /**
     28  * Empty frame to steal events for two-pane view when the drawer is open.
     29  */
     30 public class ConversationViewFrame extends FrameLayout {
     31 
     32     private final ViewConfiguration mConfiguration;
     33     private long mInterceptedTime;
     34     private float mInterceptedXDown;
     35     private float mInterceptedYDown;
     36 
     37     public interface DownEventListener {
     38         boolean shouldBlockTouchEvents();
     39         void onConversationViewFrameTapped();
     40         void onConversationViewTouchDown();
     41     }
     42 
     43     private DownEventListener mDownEventListener;
     44 
     45     public ConversationViewFrame(Context c) {
     46         this(c, null);
     47     }
     48 
     49     public ConversationViewFrame(Context c, AttributeSet attrs) {
     50         super(c, attrs);
     51         mConfiguration = ViewConfiguration.get(c);
     52     }
     53 
     54     public void setDownEventListener(DownEventListener l) {
     55         mDownEventListener = l;
     56     }
     57 
     58     @Override
     59     public boolean onInterceptTouchEvent(MotionEvent ev) {
     60         final boolean steal = (mDownEventListener != null
     61                 && mDownEventListener.shouldBlockTouchEvents());
     62         if (!steal && ev.getActionMasked() == MotionEvent.ACTION_DOWN
     63                 && mDownEventListener != null) {
     64             // notify 2-pane that this CV is being interacted (to turn a peek->normal)
     65             mDownEventListener.onConversationViewTouchDown();
     66         }
     67         return steal;
     68     }
     69 
     70     @Override
     71     public boolean onTouchEvent(@NonNull MotionEvent ev) {
     72         if (mDownEventListener != null) {
     73             switch (ev.getActionMasked()) {
     74                 case MotionEvent.ACTION_DOWN:
     75                     mInterceptedTime = SystemClock.elapsedRealtime();
     76                     mInterceptedXDown = ev.getX();
     77                     mInterceptedYDown = ev.getY();
     78                     break;
     79                 case MotionEvent.ACTION_UP:
     80                     // Check for a tap
     81                     final long timeDelta = SystemClock.elapsedRealtime() - mInterceptedTime;
     82                     final float xDelta = ev.getX() - mInterceptedXDown;
     83                     final float yDelta = ev.getY() - mInterceptedYDown;
     84                     if (timeDelta < ViewConfiguration.getTapTimeout()
     85                             && xDelta < mConfiguration.getScaledTouchSlop()
     86                             && yDelta < mConfiguration.getScaledTouchSlop()) {
     87                         mDownEventListener.onConversationViewFrameTapped();
     88                     }
     89             }
     90             return true;
     91         }
     92         return false;
     93     }
     94 
     95 }
     96