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/*
* Copyright (C) 2016 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.emergency.preferences;
import android.content.Context;
import android.content.res.TypedArray;
import android.support.annotation.Nullable;
import android.support.v7.preference.ListPreference;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.TextUtils;
import android.text.style.TtsSpan;
import android.util.AttributeSet;
import com.android.emergency.R;
import com.android.emergency.ReloadablePreferenceInterface;
import com.android.internal.annotations.VisibleForTesting;
/**
* Custom {@link ListPreference} that allows us to refresh and update the summary.
*/
public class EmergencyListPreference extends ListPreference
implements ReloadablePreferenceInterface {
@Nullable
private CharSequence[] mContentDescriptions;
public EmergencyListPreference(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.EmergencyListPreference);
mContentDescriptions =
a.getTextArray(R.styleable.EmergencyListPreference_entryContentDescriptions);
a.recycle();
if (mContentDescriptions != null) {
// Override entries with accessible entries.
setEntries(createAccessibleEntries(getEntries(), mContentDescriptions));
}
}
@Override
public void reloadFromPreference() {
setValue(getPersistedString(""));
}
@Override
public boolean isNotSet() {
return TextUtils.isEmpty(getValue());
}
@Override
public CharSequence getSummary() {
final String value = getValue();
int index = findIndexOfValue(value);
if (index < 0) {
return super.getSummary();
} else {
return getEntry();
}
}
@Nullable
@VisibleForTesting
CharSequence[] getContentDescriptions() {
return mContentDescriptions;
}
private static CharSequence[] createAccessibleEntries(CharSequence entries[],
CharSequence[] contentDescriptions) {
CharSequence[] accessibleEntries = new CharSequence[entries.length];
for (int i = 0; i < entries.length; i++) {
accessibleEntries[i] = createAccessibleSequence(entries[i], contentDescriptions[i]);
}
return accessibleEntries;
}
private static SpannableString createAccessibleSequence(CharSequence displayText,
CharSequence accessibleText) {
SpannableString str = new SpannableString(displayText);
str.setSpan(new TtsSpan.TextBuilder((String) accessibleText).build(), 0,
displayText.length(),
Spannable.SPAN_INCLUSIVE_INCLUSIVE);
return str;
}
}
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