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 package com.android.dreams.phototable;
17 
18 import android.content.Context;
19 import android.content.res.Resources;
20 import android.view.MotionEvent;
21 
22 /**
23  * Detect and dispatch edge events.
24  */
25 public class EdgeSwipeDetector {
26     @SuppressWarnings("unused")
27     private static final String TAG = "EdgeSwipeDetector";
28     private float mEdgeSwipeGutter;
29     private float mEdgeSwipeThreshold;
30     private boolean mEdgeSwipe;
31 
32     private final PhotoTable mTable;
33 
EdgeSwipeDetector(Context context, PhotoTable table)34     public EdgeSwipeDetector(Context context, PhotoTable table) {
35         mTable = table;
36         final Resources resources = context.getResources();
37         mEdgeSwipeGutter = resources.getInteger(R.integer.table_edge_swipe_gutter) / 1000000f;
38         mEdgeSwipeThreshold = resources.getInteger(R.integer.table_edge_swipe_threshold) / 1000000f;
39     }
40 
onTouchEvent(MotionEvent event)41     public boolean onTouchEvent(MotionEvent event) {
42         switch (event.getAction()) {
43             case MotionEvent.ACTION_DOWN:
44                 float edgeGutter = event.getDevice().getMotionRange(MotionEvent.AXIS_X).getMax()
45                         * mEdgeSwipeGutter;
46                 if (event.getX() < edgeGutter) {
47                     mEdgeSwipe = true;
48                     return true;
49                 }
50                 break;
51 
52             case MotionEvent.ACTION_MOVE:
53                 if (mEdgeSwipe) {
54                     return true;
55                 }
56                 break;
57 
58             case MotionEvent.ACTION_UP:
59                 if (mEdgeSwipe) {
60                     mEdgeSwipe = false;
61                     float enough = event.getDevice().getMotionRange(MotionEvent.AXIS_X).getMax()
62                             * mEdgeSwipeThreshold;
63                     if (event.getX() > enough) {
64                         if (mTable.hasFocus()) {
65                             mTable.fling(mTable.getFocus());
66                         } else if (mTable.hasSelection()) {
67                             mTable.clearSelection();
68                         }
69                     }
70                     return true;
71                 }
72                 break;
73         }
74         return false;
75     }
76 }
77