1 /*
2  * Copyright (C) 2016 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.android.settings.localepicker;
18 
19 import android.content.Context;
20 import android.os.Bundle;
21 import android.view.View;
22 
23 import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
24 import androidx.recyclerview.widget.LinearLayoutManager;
25 import androidx.recyclerview.widget.RecyclerView;
26 
27 import com.android.settings.R;
28 
29 /**
30  * Add accessibility actions to the drag-and-drop locale list
31  *
32  * <p>Dragging is not supported neither by TalkBack or the accessibility
33  * framework at the moment. So we need custom actions to be able
34  * to change the order of the locales.</p>
35  *
36  * <p>Also, the remove functionality is difficult to discover and use
37  * with TalkBack only, so we are also adding a "remove" action.</p>
38  *
39  * <p>It only removes one locale at the time, but most users don't
40  * really add many locales "by mistake", so there is no real need
41  * to delete a lot of locales at once.</p>
42  */
43 public class LocaleLinearLayoutManager extends LinearLayoutManager {
44     private final LocaleDragAndDropAdapter mAdapter;
45     private final Context mContext;
46 
47     private final AccessibilityNodeInfoCompat.AccessibilityActionCompat mActionMoveUp;
48     private final AccessibilityNodeInfoCompat.AccessibilityActionCompat mActionMoveDown;
49     private final AccessibilityNodeInfoCompat.AccessibilityActionCompat mActionMoveTop;
50     private final AccessibilityNodeInfoCompat.AccessibilityActionCompat mActionMoveBottom;
51     private final AccessibilityNodeInfoCompat.AccessibilityActionCompat mActionRemove;
52 
LocaleLinearLayoutManager(Context context, LocaleDragAndDropAdapter adapter)53     public LocaleLinearLayoutManager(Context context, LocaleDragAndDropAdapter adapter) {
54         super(context);
55         this.mContext = context;
56         this.mAdapter = adapter;
57 
58         this.mActionMoveUp = new AccessibilityNodeInfoCompat.AccessibilityActionCompat(
59                 R.id.action_drag_move_up,
60                 mContext.getString(R.string.action_drag_label_move_up));
61         this.mActionMoveDown = new AccessibilityNodeInfoCompat.AccessibilityActionCompat(
62                 R.id.action_drag_move_down,
63                 mContext.getString(R.string.action_drag_label_move_down));
64         this.mActionMoveTop = new AccessibilityNodeInfoCompat.AccessibilityActionCompat(
65                 R.id.action_drag_move_top,
66                 mContext.getString(R.string.action_drag_label_move_top));
67         this.mActionMoveBottom = new AccessibilityNodeInfoCompat.AccessibilityActionCompat(
68                 R.id.action_drag_move_bottom,
69                 mContext.getString(R.string.action_drag_label_move_bottom));
70         this.mActionRemove = new AccessibilityNodeInfoCompat.AccessibilityActionCompat(
71                 R.id.action_drag_remove,
72                 mContext.getString(R.string.action_drag_label_remove));
73     }
74 
75     @Override
onInitializeAccessibilityNodeInfoForItem(RecyclerView.Recycler recycler, RecyclerView.State state, View host, AccessibilityNodeInfoCompat info)76     public void onInitializeAccessibilityNodeInfoForItem(RecyclerView.Recycler recycler,
77             RecyclerView.State state, View host, AccessibilityNodeInfoCompat info) {
78 
79         super.onInitializeAccessibilityNodeInfoForItem(recycler, state, host, info);
80 
81         final int itemCount = this.getItemCount();
82         final int position = this.getPosition(host);
83         final LocaleDragCell dragCell = (LocaleDragCell) host;
84 
85         // We want the description to be something not localizable, so that any TTS engine for
86         // any language can handle it. And we want the position to be part of it.
87         // So we use something like "2, French (France)"
88         final String description =
89                 (position + 1) + ", " + dragCell.getCheckbox().getContentDescription();
90         info.setContentDescription(description);
91 
92         if (mAdapter.isRemoveMode()) { // We don't move things around in remove mode
93             return;
94         }
95 
96         // The order in which we add the actions is important for the circular selection menu.
97         // With the current order the "up" action will be (more or less) up, and "down" more
98         // or less down ("more or less" because we have 5 actions)
99         if (position > 0) { // it is not the first one
100             info.addAction(mActionMoveUp);
101             info.addAction(mActionMoveTop);
102         }
103         if (position + 1 < itemCount) { // it is not the last one
104             info.addAction(mActionMoveDown);
105             info.addAction(mActionMoveBottom);
106         }
107         if (itemCount > 1) {
108             info.addAction(mActionRemove);
109         }
110     }
111 
112     @Override
performAccessibilityActionForItem(RecyclerView.Recycler recycler, RecyclerView.State state, View host, int action, Bundle args)113     public boolean performAccessibilityActionForItem(RecyclerView.Recycler recycler,
114             RecyclerView.State state, View host, int action, Bundle args) {
115 
116         final int itemCount = this.getItemCount();
117         final int position = this.getPosition(host);
118         boolean result = false;
119 
120         if (action == R.id.action_drag_move_up) {
121             if (position > 0) {
122                 mAdapter.onItemMove(position, position - 1);
123                 result = true;
124             }
125         } else if (action == R.id.action_drag_move_down) {
126             if (position + 1 < itemCount) {
127                 mAdapter.onItemMove(position, position + 1);
128                 result = true;
129             }
130         } else if (action == R.id.action_drag_move_top) {
131             if (position != 0) {
132                 mAdapter.onItemMove(position, 0);
133                 result = true;
134             }
135         } else if (action == R.id.action_drag_move_bottom) {
136             if (position != itemCount - 1) {
137                 mAdapter.onItemMove(position, itemCount - 1);
138                 result = true;
139             }
140         } else if (action == R.id.action_drag_remove) {
141             if (itemCount > 1) {
142                 mAdapter.removeItem(position);
143                 result = true;
144             }
145         } else {
146             return super.performAccessibilityActionForItem(recycler, state, host, action, args);
147         }
148 
149         if (result) {
150             mAdapter.doTheUpdate();
151         }
152         return result;
153     }
154 }
155