/*
* Copyright (C) 2011 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.talkback.formatter;
import android.support.v4.view.accessibility.AccessibilityEventCompat;
import android.text.SpannableStringBuilder;
import android.text.TextUtils;
import android.view.accessibility.AccessibilityEvent;
import com.android.talkback.R;
import com.google.android.marvin.talkback.TalkBackService;
import com.android.talkback.Utterance;
import com.android.utils.StringBuilderUtils;
import java.util.Collections;
import java.util.List;
/**
* Formatter for touch exploration events from the System UI.
*/
public class TouchExplorationSystemUiFormatter
implements EventSpeechRule.AccessibilityEventFormatter {
/** The most recently spoken utterance. Used to eliminate duplicates. */
private final SpannableStringBuilder mLastUtteranceText = new SpannableStringBuilder();
@Override
public boolean format(AccessibilityEvent event, TalkBackService context, Utterance utterance) {
final SpannableStringBuilder recordText = new SpannableStringBuilder();
final List<CharSequence> entries = AccessibilityEventCompat.getRecord(event, 0).getText();
// Reverse the entries so that time is read aloud first.
Collections.reverse(entries);
for (final CharSequence entry : entries) {
StringBuilderUtils.appendWithSeparator(recordText, entry);
}
// Don't populate with empty text. This should never happen!
if (TextUtils.isEmpty(recordText)) return false;
// Don't speak the same utterance twice.
if (TextUtils.equals(mLastUtteranceText, recordText)) return false;
utterance.addSpoken(recordText);
utterance.addHaptic(R.array.view_hovered_pattern);
utterance.addAuditory(R.raw.focus);
mLastUtteranceText.clear();
mLastUtteranceText.append(recordText);
return true;
}
}