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 */
16package com.android.messaging.util;
17
18import android.content.Context;
19import android.content.res.Resources;
20import android.support.v4.view.accessibility.AccessibilityEventCompat;
21import android.support.v4.view.accessibility.AccessibilityRecordCompat;
22import android.text.TextUtils;
23import android.view.View;
24import android.view.accessibility.AccessibilityEvent;
25import android.view.accessibility.AccessibilityManager;
26
27import com.android.messaging.Factory;
28import com.android.messaging.R;
29
30import javax.annotation.Nullable;
31
32public class AccessibilityUtil {
33    public static String sContentDescriptionDivider;
34
35    public static boolean isTouchExplorationEnabled(final Context context) {
36        final AccessibilityManager accessibilityManager = (AccessibilityManager)
37                context.getSystemService(Context.ACCESSIBILITY_SERVICE);
38        return accessibilityManager.isTouchExplorationEnabled();
39    }
40
41    public static StringBuilder appendContentDescription(final Context context,
42            final StringBuilder contentDescription, final String val) {
43        if (sContentDescriptionDivider == null) {
44            sContentDescriptionDivider =
45                    context.getResources().getString(R.string.enumeration_comma);
46        }
47        if (contentDescription.length() != 0) {
48            contentDescription.append(sContentDescriptionDivider);
49        }
50        contentDescription.append(val);
51        return contentDescription;
52    }
53
54    public static void announceForAccessibilityCompat(
55            final View view, @Nullable final AccessibilityManager accessibilityManager,
56            final int textResourceId) {
57        final String text = Factory.get().getApplicationContext().getResources().getString(
58                textResourceId);
59        announceForAccessibilityCompat(view, accessibilityManager, text);
60    }
61
62    public static void announceForAccessibilityCompat(
63            final View view, @Nullable AccessibilityManager accessibilityManager,
64            final CharSequence text) {
65        final Context context = view.getContext().getApplicationContext();
66        if (accessibilityManager == null) {
67            accessibilityManager = (AccessibilityManager) context.getSystemService(
68                    Context.ACCESSIBILITY_SERVICE);
69        }
70
71        if (!accessibilityManager.isEnabled()) {
72            return;
73        }
74
75        // Jelly Bean added support for speaking text verbatim
76        final int eventType = OsUtil.isAtLeastJB() ? AccessibilityEvent.TYPE_ANNOUNCEMENT
77                : AccessibilityEvent.TYPE_VIEW_FOCUSED;
78
79        // Construct an accessibility event with the minimum recommended
80        // attributes. An event without a class name or package may be dropped.
81        final AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
82        event.getText().add(text);
83        event.setEnabled(view.isEnabled());
84        event.setClassName(view.getClass().getName());
85        event.setPackageName(context.getPackageName());
86
87        // JellyBean MR1 requires a source view to set the window ID.
88        final AccessibilityRecordCompat record = AccessibilityEventCompat.asRecord(event);
89        record.setSource(view);
90
91        // Sends the event directly through the accessibility manager. If we only supported SDK 14+
92        // we could have done:
93        // getParent().requestSendAccessibilityEvent(this, event);
94        accessibilityManager.sendAccessibilityEvent(event);
95    }
96
97    /**
98     * Check to see if the current layout is Right-to-Left. This check is only supported for
99     * API 17+.
100     * For earlier versions, this method will just return false.
101     * @return boolean Boolean indicating whether the currently locale is RTL.
102     */
103    public static boolean isLayoutRtl(final View view) {
104        if (OsUtil.isAtLeastJB_MR1()) {
105            return View.LAYOUT_DIRECTION_RTL == view.getLayoutDirection();
106        } else {
107            return false;
108        }
109    }
110
111    public static String getVocalizedPhoneNumber(final Resources res, final String phoneNumber) {
112        if (TextUtils.isEmpty(phoneNumber)) {
113            return "";
114        }
115        final StringBuilder vocalizedPhoneNumber = new StringBuilder();
116        for (final char c : phoneNumber.toCharArray()) {
117            getVocalizedNumber(res, c, vocalizedPhoneNumber);
118        }
119        return vocalizedPhoneNumber.toString();
120    }
121
122    public static void getVocalizedNumber(final Resources res, final char c,
123            final StringBuilder builder) {
124        switch (c) {
125            case '0':
126                builder.append(res.getString(R.string.content_description_for_number_zero));
127                builder.append(" ");
128                return;
129            case '1':
130                builder.append(res.getString(R.string.content_description_for_number_one));
131                builder.append(" ");
132                return;
133            case '2':
134                builder.append(res.getString(R.string.content_description_for_number_two));
135                builder.append(" ");
136                return;
137            case '3':
138                builder.append(res.getString(R.string.content_description_for_number_three));
139                builder.append(" ");
140                return;
141            case '4':
142                builder.append(res.getString(R.string.content_description_for_number_four));
143                builder.append(" ");
144                return;
145            case '5':
146                builder.append(res.getString(R.string.content_description_for_number_five));
147                builder.append(" ");
148                return;
149            case '6':
150                builder.append(res.getString(R.string.content_description_for_number_six));
151                builder.append(" ");
152                return;
153            case '7':
154                builder.append(res.getString(R.string.content_description_for_number_seven));
155                builder.append(" ");
156                return;
157            case '8':
158                builder.append(res.getString(R.string.content_description_for_number_eight));
159                builder.append(" ");
160                return;
161            case '9':
162                builder.append(res.getString(R.string.content_description_for_number_nine));
163                builder.append(" ");
164                return;
165            default:
166                builder.append(c);
167                return;
168        }
169    }
170}
171