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/*
* Copyright (C) 2016 The CyanogenMod Project
* Copyright (C) 2018 The LineageOS 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 lineageos.preference;
import android.content.Context;
import android.util.AttributeSet;
import androidx.preference.DropDownPreference;
import androidx.preference.PreferenceDataStore;
import androidx.preference.PreferenceViewHolder;
/**
* A Preference which can automatically remove itself from the hierarchy
* based on constraints set in XML.
*/
public abstract class SelfRemovingDropDownPreference extends DropDownPreference {
private final ConstraintsHelper mConstraints;
public SelfRemovingDropDownPreference(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mConstraints = new ConstraintsHelper(context, attrs, this);
setPreferenceDataStore(new DataStore());
}
public SelfRemovingDropDownPreference(Context context, AttributeSet attrs) {
super(context, attrs);
mConstraints = new ConstraintsHelper(context, attrs, this);
setPreferenceDataStore(new DataStore());
}
public SelfRemovingDropDownPreference(Context context) {
super(context);
mConstraints = new ConstraintsHelper(context, null, this);
setPreferenceDataStore(new DataStore());
}
@Override
public void onAttached() {
super.onAttached();
mConstraints.onAttached();
}
@Override
public void onBindViewHolder(PreferenceViewHolder holder) {
super.onBindViewHolder(holder);
mConstraints.onBindViewHolder(holder);
}
public void setAvailable(boolean available) {
mConstraints.setAvailable(available);
}
public boolean isAvailable() {
return mConstraints.isAvailable();
}
protected abstract boolean isPersisted();
protected abstract void putString(String key, String value);
protected abstract String getString(String key, String defaultValue);
@Override
protected void onSetInitialValue(boolean restorePersistedValue, Object defaultValue) {
final String value;
if (!restorePersistedValue || !isPersisted()) {
if (defaultValue == null) {
return;
}
value = (String) defaultValue;
if (shouldPersist()) {
persistString(value);
}
} else {
// Note: the default is not used because to have got here
// isPersisted() must be true.
value = getString(getKey(), null /* not used */);
}
setValue(value);
}
private class DataStore extends PreferenceDataStore {
@Override
public void putString(String key, String value) {
SelfRemovingDropDownPreference.this.putString(key, value);
}
@Override
public String getString(String key, String defaultValue) {
return SelfRemovingDropDownPreference.this.getString(key, defaultValue);
}
}
}
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