1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings.widget;
import android.graphics.Rect;
import android.os.Bundle;
import android.text.Layout;
import android.text.Spanned;
import android.text.style.ClickableSpan;
import android.util.Log;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import android.widget.TextView;
import java.util.List;
/**
* Copied from setup wizard.
*/
public class LinkAccessibilityHelper extends ExploreByTouchHelper {
private static final String TAG = "LinkAccessibilityHelper";
private final TextView mView;
private final Rect mTempRect = new Rect();
public LinkAccessibilityHelper(TextView view) {
super(view);
mView = view;
}
@Override
protected int getVirtualViewAt(float x, float y) {
final CharSequence text = mView.getText();
if (text instanceof Spanned) {
final Spanned spannedText = (Spanned) text;
final int offset = mView.getOffsetForPosition(x, y);
ClickableSpan[] linkSpans = spannedText.getSpans(offset, offset, ClickableSpan.class);
if (linkSpans.length == 1) {
ClickableSpan linkSpan = linkSpans[0];
return spannedText.getSpanStart(linkSpan);
}
}
return INVALID_ID;
}
@Override
protected void getVisibleVirtualViews(List<Integer> virtualViewIds) {
final CharSequence text = mView.getText();
if (text instanceof Spanned) {
final Spanned spannedText = (Spanned) text;
ClickableSpan[] linkSpans = spannedText.getSpans(0, spannedText.length(),
ClickableSpan.class);
for (ClickableSpan span : linkSpans) {
virtualViewIds.add(spannedText.getSpanStart(span));
}
}
}
@Override
protected void onPopulateEventForVirtualView(int virtualViewId, AccessibilityEvent event) {
final ClickableSpan span = getSpanForOffset(virtualViewId);
if (span != null) {
event.setContentDescription(getTextForSpan(span));
} else {
Log.e(TAG, "ClickableSpan is null for offset: " + virtualViewId);
event.setContentDescription(mView.getText());
}
}
@Override
protected void onPopulateNodeForVirtualView(int virtualViewId, AccessibilityNodeInfo info) {
final ClickableSpan span = getSpanForOffset(virtualViewId);
if (span != null) {
info.setContentDescription(getTextForSpan(span));
} else {
Log.e(TAG, "ClickableSpan is null for offset: " + virtualViewId);
info.setContentDescription(mView.getText());
}
info.setFocusable(true);
info.setClickable(true);
getBoundsForSpan(span, mTempRect);
if (!mTempRect.isEmpty()) {
info.setBoundsInParent(getBoundsForSpan(span, mTempRect));
} else {
Log.e(TAG, "LinkSpan bounds is empty for: " + virtualViewId);
mTempRect.set(0, 0, 1, 1);
info.setBoundsInParent(mTempRect);
}
info.addAction(AccessibilityNodeInfo.ACTION_CLICK);
}
@Override
protected boolean onPerformActionForVirtualView(int virtualViewId, int action,
Bundle arguments) {
if (action == AccessibilityNodeInfo.ACTION_CLICK) {
ClickableSpan span = getSpanForOffset(virtualViewId);
if (span != null) {
span.onClick(mView);
return true;
} else {
Log.e(TAG, "LinkSpan is null for offset: " + virtualViewId);
}
}
return false;
}
private ClickableSpan getSpanForOffset(int offset) {
CharSequence text = mView.getText();
if (text instanceof Spanned) {
Spanned spannedText = (Spanned) text;
ClickableSpan[] spans = spannedText.getSpans(offset, offset, ClickableSpan.class);
if (spans.length == 1) {
return spans[0];
}
}
return null;
}
private CharSequence getTextForSpan(ClickableSpan span) {
CharSequence text = mView.getText();
if (text instanceof Spanned) {
Spanned spannedText = (Spanned) text;
return spannedText.subSequence(spannedText.getSpanStart(span),
spannedText.getSpanEnd(span));
}
return text;
}
// Find the bounds of a span. If it spans multiple lines, it will only return the bounds for the
// section on the first line.
private Rect getBoundsForSpan(ClickableSpan span, Rect outRect) {
CharSequence text = mView.getText();
outRect.setEmpty();
if (text instanceof Spanned) {
Spanned spannedText = (Spanned) text;
final int spanStart = spannedText.getSpanStart(span);
final int spanEnd = spannedText.getSpanEnd(span);
final Layout layout = mView.getLayout();
final float xStart = layout.getPrimaryHorizontal(spanStart);
final float xEnd = layout.getPrimaryHorizontal(spanEnd);
final int lineStart = layout.getLineForOffset(spanStart);
final int lineEnd = layout.getLineForOffset(spanEnd);
layout.getLineBounds(lineStart, outRect);
outRect.left = (int) xStart;
if (lineEnd == lineStart) {
outRect.right = (int) xEnd;
} // otherwise just leave it at the end of the start line
// Offset for padding
outRect.offset(mView.getTotalPaddingLeft(), mView.getTotalPaddingTop());
}
return outRect;
}
}
|
