app_Settings/src/com/android/settings/display/WallpaperPreferenceController.java

/*
 * 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.settings.display;

import android.content.Context;
import android.os.UserHandle;
import android.support.v7.preference.Preference;

import com.android.settings.core.PreferenceController;
import com.android.settingslib.RestrictedLockUtils;
import com.android.settingslib.RestrictedPreference;

import static android.os.UserManager.DISALLOW_SET_WALLPAPER;

public class WallpaperPreferenceController extends PreferenceController {

    private static final String KEY_WALLPAPER = "wallpaper";

    public WallpaperPreferenceController(Context context) {
        super(context);
    }

    @Override
    public boolean isAvailable() {
        return true;
    }

    @Override
    public String getPreferenceKey() {
        return KEY_WALLPAPER;
    }

    @Override
    public void updateState(Preference preference) {
        disablePreferenceIfManaged((RestrictedPreference) preference);
    }

    private void disablePreferenceIfManaged(RestrictedPreference pref) {
        final String restriction = DISALLOW_SET_WALLPAPER;
        if (pref != null) {
            pref.setDisabledByAdmin(null);
            if (RestrictedLockUtils.hasBaseUserRestriction(mContext,
                    restriction, UserHandle.myUserId())) {
                pref.setEnabled(false);
            } else {
                pref.checkRestrictionAndSetDisabled(restriction);
            }
        }
    }
}