1/*
2 * Copyright (C) 2015 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
17package com.android.launcher3.accessibility;
18
19import android.content.Context;
20import android.os.Bundle;
21import android.util.SparseArray;
22import android.view.View;
23import android.view.View.AccessibilityDelegate;
24import android.view.accessibility.AccessibilityNodeInfo;
25import android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction;
26
27import com.android.launcher3.R;
28import com.android.launcher3.Utilities;
29import com.android.launcher3.Workspace;
30import com.android.launcher3.config.FeatureFlags;
31
32public class OverviewScreenAccessibilityDelegate extends AccessibilityDelegate {
33
34    private static final int MOVE_BACKWARD = R.id.action_move_screen_backwards;
35    private static final int MOVE_FORWARD = R.id.action_move_screen_forwards;
36
37    private final SparseArray<AccessibilityAction> mActions = new SparseArray<>();
38    private final Workspace mWorkspace;
39
40    public OverviewScreenAccessibilityDelegate(Workspace workspace) {
41        mWorkspace = workspace;
42
43        Context context = mWorkspace.getContext();
44        boolean isRtl = Utilities.isRtl(context.getResources());
45        mActions.put(MOVE_BACKWARD, new AccessibilityAction(MOVE_BACKWARD,
46                context.getText(isRtl ? R.string.action_move_screen_right :
47                    R.string.action_move_screen_left)));
48        mActions.put(MOVE_FORWARD, new AccessibilityAction(MOVE_FORWARD,
49                context.getText(isRtl ? R.string.action_move_screen_left :
50                    R.string.action_move_screen_right)));
51    }
52
53    @Override
54    public boolean performAccessibilityAction(View host, int action, Bundle args) {
55        if (host != null) {
56            if (action == AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS ) {
57                int index = mWorkspace.indexOfChild(host);
58                mWorkspace.setCurrentPage(index);
59            } else if (action == MOVE_FORWARD) {
60                movePage(mWorkspace.indexOfChild(host) + 1, host);
61                return true;
62            } else if (action == MOVE_BACKWARD) {
63                movePage(mWorkspace.indexOfChild(host) - 1, host);
64                return true;
65            }
66        }
67
68        return super.performAccessibilityAction(host, action, args);
69    }
70
71    private void movePage(int finalIndex, View view) {
72        mWorkspace.onStartReordering();
73        mWorkspace.removeView(view);
74        mWorkspace.addView(view, finalIndex);
75        mWorkspace.onEndReordering();
76        mWorkspace.announceForAccessibility(mWorkspace.getContext().getText(R.string.screen_moved));
77
78        mWorkspace.updateAccessibilityFlags();
79        view.performAccessibilityAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
80    }
81
82    @Override
83    public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
84        super.onInitializeAccessibilityNodeInfo(host, info);
85
86        int index = mWorkspace.indexOfChild(host);
87        if (index < mWorkspace.getChildCount() - 1) {
88            info.addAction(mActions.get(MOVE_FORWARD));
89        }
90
91        int startIndex = mWorkspace.numCustomPages() + (FeatureFlags.QSB_ON_FIRST_SCREEN ? 1 : 0);
92        if (index > startIndex) {
93            info.addAction(mActions.get(MOVE_BACKWARD));
94        }
95    }
96}
97