1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License
15  */
16 
17 package com.android.settings.display;
18 
19 import android.content.Context;
20 import android.text.TextUtils;
21 import android.util.AttributeSet;
22 
23 import androidx.core.content.res.TypedArrayUtils;
24 import androidx.preference.Preference;
25 
26 import com.android.settingslib.display.DisplayDensityUtils;
27 
28 /**
29  * Preference for changing the density of the display on which the preference
30  * is visible.
31  */
32 public class ScreenZoomPreference extends Preference {
ScreenZoomPreference(Context context, AttributeSet attrs)33     public ScreenZoomPreference(Context context, AttributeSet attrs) {
34         super(context, attrs, TypedArrayUtils.getAttr(context,
35                 androidx.preference.R.attr.preferenceStyle,
36                 android.R.attr.preferenceStyle));
37 
38         final DisplayDensityUtils density = new DisplayDensityUtils(context);
39         final int defaultIndex = density.getCurrentIndex();
40         if (defaultIndex < 0) {
41             setVisible(false);
42             setEnabled(false);
43         } else if (TextUtils.isEmpty(getSummary())) {
44             final String[] entries = density.getEntries();
45             final int currentIndex = density.getCurrentIndex();
46             setSummary(entries[currentIndex]);
47         }
48     }
49 }
50