org.getlantern.firetweet.preference.ValueDependencyCheckBoxPreference.java Source code

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Here is the source code for org.getlantern.firetweet.preference.ValueDependencyCheckBoxPreference.java

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/*
 *             Firetweet - Twitter client for Android
 * 
 *  Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com>
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.getlantern.firetweet.preference;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.preference.PreferenceManager;
import android.support.annotation.NonNull;
import android.util.AttributeSet;

import org.apache.commons.lang3.ArrayUtils;
import org.getlantern.firetweet.R;
import org.getlantern.firetweet.util.ParseUtils;

import java.util.Map;

public class ValueDependencyCheckBoxPreference extends AutoFixCheckBoxPreference
        implements OnSharedPreferenceChangeListener {

    private final String mDependencyKey, mDependencyValueDefault;
    private final String[] mDependencyValues;

    public ValueDependencyCheckBoxPreference(final Context context) {
        this(context, null);
    }

    public ValueDependencyCheckBoxPreference(final Context context, final AttributeSet attrs) {
        this(context, attrs, android.R.attr.checkBoxPreferenceStyle);
    }

    public ValueDependencyCheckBoxPreference(final Context context, final AttributeSet attrs, final int defStyle) {
        super(context, attrs, defStyle);
        final Resources res = context.getResources();
        final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ValueDependencyPreference, defStyle,
                0);
        mDependencyKey = a.getString(R.styleable.ValueDependencyPreference_dependencyKey);
        final int dependencyValueRes = a.getResourceId(R.styleable.ValueDependencyPreference_dependencyValues, 0);
        mDependencyValues = dependencyValueRes > 0 ? res.getStringArray(dependencyValueRes) : null;
        mDependencyValueDefault = a.getString(R.styleable.ValueDependencyPreference_dependencyValueDefault);
        a.recycle();
    }

    @Override
    public void onSharedPreferenceChanged(final SharedPreferences sharedPreferences, final String key) {
        if (key.equals(mDependencyKey)) {
            updateEnableState();
        }
    }

    @Override
    protected void notifyHierarchyChanged() {
        super.notifyHierarchyChanged();
        updateEnableState();
    }

    @Override
    protected void onAttachedToHierarchy(@NonNull final PreferenceManager preferenceManager) {
        super.onAttachedToHierarchy(preferenceManager);
        final SharedPreferences prefs = getSharedPreferences();
        if (prefs != null) {
            prefs.registerOnSharedPreferenceChangeListener(this);
        }
        updateEnableState();
    }

    private void updateEnableState() {
        final SharedPreferences prefs = getSharedPreferences();
        if (prefs == null || mDependencyKey == null || mDependencyValues == null)
            return;
        final Map<String, ?> all = prefs.getAll();
        final String valueString = ParseUtils.parseString(all.get(mDependencyKey), mDependencyValueDefault);
        setEnabled(ArrayUtils.contains(mDependencyValues, valueString));
    }

}