content: /*
   * Copyright (C) 2019 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.quickstep;
  
  import static com.android.launcher3.util.PackageManagerHelper.getPackageFilter;
  
  import android.content.BroadcastReceiver;
  import android.content.Context;
  import android.content.Intent;
  import android.content.res.Resources;
  import android.util.Log;
  
  import com.android.launcher3.util.MainThreadInitializedObject;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Observer for the resource config that specifies the navigation bar mode.
   */
  public class SysUINavigationMode {
  
      public enum Mode {
          THREE_BUTTONS(false, 0),
          TWO_BUTTONS(true, 1),
          NO_BUTTON(true, 2);
  
          public final boolean hasGestures;
          public final int resValue;
  
          Mode(boolean hasGestures, int resValue) {
              this.hasGestures = hasGestures;
              this.resValue = resValue;
          }
      }
  
      public static Mode getMode(Context context) {
          return INSTANCE.get(context).getMode();
      }
  
      public static MainThreadInitializedObject<SysUINavigationMode> INSTANCE =
              new MainThreadInitializedObject<>(SysUINavigationMode::new);
  
      private static final String TAG = "SysUINavigationMode";
  
      private final String ACTION_OVERLAY_CHANGED = "android.intent.action.OVERLAY_CHANGED";
      private static final String NAV_BAR_INTERACTION_MODE_RES_NAME =
              "config_navBarInteractionMode";
  
      private final Context mContext;
      private Mode mMode;
  
      private final List<NavigationModeChangeListener> mChangeListeners = new ArrayList<>();
  
      public SysUINavigationMode(Context context) {
          mContext = context;
          initializeMode();
  
          mContext.registerReceiver(new BroadcastReceiver() {
              @Override
              public void onReceive(Context context, Intent intent) {
                  Mode oldMode = mMode;
                  initializeMode();
                  if (mMode != oldMode) {
                      dispatchModeChange();
                  }
              }
          }, getPackageFilter("android", ACTION_OVERLAY_CHANGED));
      }
  
      private void initializeMode() {
          int modeInt = getSystemIntegerRes(mContext, NAV_BAR_INTERACTION_MODE_RES_NAME);
          for(Mode m : Mode.values()) {
              if (m.resValue == modeInt) {
                  mMode = m;
              }
          }
      }
  
      private void dispatchModeChange() {
          for (NavigationModeChangeListener listener : mChangeListeners) {
              listener.onNavigationModeChanged(mMode);
          }
      }
  
      public Mode addModeChangeListener(NavigationModeChangeListener listener) {
          mChangeListeners.add(listener);
          return mMode;
      }
  
      public void removeModeChangeListener(NavigationModeChangeListener listener) {
          mChangeListeners.remove(listener);
      }
  
      public Mode getMode() {
          return mMode;
      }
  
      private static int getSystemIntegerRes(Context context, String resName) {
          Resources res = context.getResources();
          int resId = res.getIdentifier(resName, "integer", "android");
  
          if (resId != 0) {
              return res.getInteger(resId);
          } else {
              Log.e(TAG, "Failed to get system resource ID. Incompatible framework version?");
              return -1;
          }
      }
  
      public interface NavigationModeChangeListener {
  
          void onNavigationModeChanged(Mode newMode);
      }
  }