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      1 /*
      2  * Copyright (C) 2018 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.development;
     18 
     19 import static android.os.UserHandle.USER_SYSTEM;
     20 
     21 import android.content.Context;
     22 import android.content.pm.PackageManager;
     23 import android.support.annotation.VisibleForTesting;
     24 import android.support.v7.preference.ListPreference;
     25 import android.support.v7.preference.Preference;
     26 import android.support.v7.preference.PreferenceScreen;
     27 import android.text.TextUtils;
     28 import android.view.DisplayCutout;
     29 
     30 import com.android.settings.R;
     31 import com.android.settings.core.PreferenceControllerMixin;
     32 import com.android.settings.wrapper.OverlayManagerWrapper;
     33 import com.android.settings.wrapper.OverlayManagerWrapper.OverlayInfo;
     34 import com.android.settingslib.development.DeveloperOptionsPreferenceController;
     35 
     36 import java.util.List;
     37 
     38 public class EmulateDisplayCutoutPreferenceController extends
     39         DeveloperOptionsPreferenceController implements Preference.OnPreferenceChangeListener,
     40         PreferenceControllerMixin {
     41 
     42     private static final String KEY = "display_cutout_emulation";
     43 
     44     private final OverlayManagerWrapper mOverlayManager;
     45     private final boolean mAvailable;
     46 
     47     private ListPreference mPreference;
     48     private PackageManager mPackageManager;
     49 
     50     @VisibleForTesting
     51     EmulateDisplayCutoutPreferenceController(Context context, PackageManager packageManager,
     52             OverlayManagerWrapper overlayManager) {
     53         super(context);
     54         mOverlayManager = overlayManager;
     55         mPackageManager = packageManager;
     56         mAvailable = overlayManager != null && getOverlayInfos().length > 0;
     57     }
     58 
     59     public EmulateDisplayCutoutPreferenceController(Context context) {
     60         this(context, context.getPackageManager(), new OverlayManagerWrapper());
     61     }
     62 
     63     @Override
     64     public boolean isAvailable() {
     65         return mAvailable;
     66     }
     67 
     68     @Override
     69     public String getPreferenceKey() {
     70         return KEY;
     71     }
     72 
     73     @Override
     74     public void displayPreference(PreferenceScreen screen) {
     75         super.displayPreference(screen);
     76         setPreference((ListPreference) screen.findPreference(getPreferenceKey()));
     77     }
     78 
     79     @VisibleForTesting
     80     void setPreference(ListPreference preference) {
     81         mPreference = preference;
     82     }
     83 
     84     @Override
     85     public boolean onPreferenceChange(Preference preference, Object newValue) {
     86         return setEmulationOverlay((String) newValue);
     87     }
     88 
     89     private boolean setEmulationOverlay(String packageName) {
     90         OverlayInfo[] overlays = getOverlayInfos();
     91         String currentPackageName = null;
     92         for (OverlayInfo o : overlays) {
     93             if (o.isEnabled()) {
     94                 currentPackageName = o.packageName;
     95             }
     96         }
     97 
     98         if (TextUtils.isEmpty(packageName) && TextUtils.isEmpty(currentPackageName)
     99                 || TextUtils.equals(packageName, currentPackageName)) {
    100             // Already set.
    101             return true;
    102         }
    103 
    104         final boolean result;
    105         if (TextUtils.isEmpty(packageName)) {
    106             result = mOverlayManager.setEnabled(currentPackageName, false, USER_SYSTEM);
    107         } else {
    108             result = mOverlayManager.setEnabledExclusiveInCategory(packageName, USER_SYSTEM);
    109         }
    110         updateState(mPreference);
    111         return result;
    112     }
    113 
    114     @Override
    115     public void updateState(Preference preference) {
    116         OverlayInfo[] overlays = getOverlayInfos();
    117 
    118         CharSequence[] pkgs = new CharSequence[overlays.length + 1];
    119         CharSequence[] labels = new CharSequence[pkgs.length];
    120 
    121         int current = 0;
    122         pkgs[0] = "";
    123         labels[0] = mContext.getString(R.string.display_cutout_emulation_none);
    124 
    125         for (int i = 0; i < overlays.length; i++) {
    126             OverlayInfo o = overlays[i];
    127             pkgs[i+1] = o.packageName;
    128             if (o.isEnabled()) {
    129                 current = i+1;
    130             }
    131         }
    132         for (int i = 1; i < pkgs.length; i++) {
    133             try {
    134                 labels[i] = mPackageManager.getApplicationInfo(pkgs[i].toString(), 0)
    135                         .loadLabel(mPackageManager);
    136             } catch (PackageManager.NameNotFoundException e) {
    137                 labels[i] = pkgs[i];
    138             }
    139         }
    140 
    141         mPreference.setEntries(labels);
    142         mPreference.setEntryValues(pkgs);
    143         mPreference.setValueIndex(current);
    144         mPreference.setSummary(labels[current]);
    145     }
    146 
    147     private OverlayInfo[] getOverlayInfos() {
    148         @SuppressWarnings("unchecked") List<OverlayInfo> overlayInfos =
    149                 mOverlayManager.getOverlayInfosForTarget("android", USER_SYSTEM);
    150         for (int i = overlayInfos.size() - 1; i >= 0; i--) {
    151             if (!DisplayCutout.EMULATION_OVERLAY_CATEGORY.equals(
    152                     overlayInfos.get(i).category)) {
    153                 overlayInfos.remove(i);
    154             }
    155         }
    156         return overlayInfos.toArray(new OverlayInfo[overlayInfos.size()]);
    157     }
    158 
    159     @Override
    160     protected void onDeveloperOptionsSwitchDisabled() {
    161         super.onDeveloperOptionsSwitchDisabled();
    162         setEmulationOverlay("");
    163         updateState(mPreference);
    164     }
    165 
    166 }
    167