content: /**
   * Copyright (C) 2015 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.server.vr;
  
  import android.annotation.NonNull;
  import android.app.Vr2dDisplayProperties;
  import android.content.ComponentName;
  import android.service.vr.IPersistentVrStateCallbacks;
  
  /**
   * Service for accessing the VR mode manager.
   *
   * @hide Only for use within system server.
   */
  public abstract class VrManagerInternal {
  
      /**
       * The error code returned on success.
       */
      public static final int NO_ERROR = 0;
  
      /**
       * Return {@code true} if the given package is the currently bound VrListenerService for the
       * given user.
       *
       * @param packageName The package name to check.
       * @param userId the user ID to check the package name for.
       *
       * @return {@code true} if the given package is the currently bound VrListenerService.
       */
      public abstract boolean isCurrentVrListener(String packageName, int userId);
  
      /**
       * Set the current VR mode state.
       * <p/>
       * This may delay the mode change slightly during application transitions to avoid frequently
       * tearing down VrListenerServices unless necessary.
       *
       * @param enabled {@code true} to enable VR mode.
       * @param packageName The package name of the requested VrListenerService to bind.
       * @param userId the user requesting the VrListenerService component.
       * @param processId the process the component is running in.
       * @param calling the component currently using VR mode, or null to leave unchanged.
       */
      public abstract void setVrMode(boolean enabled, @NonNull ComponentName packageName,
              int userId, int processId, @NonNull ComponentName calling);
  
      /**
       * Set whether the display used for VR output is on.
       *
       * @param isScreenOn is {@code true} if the display is on and can receive commands,
       *      or {@code false} otherwise.
       */
      public abstract void onScreenStateChanged(boolean isScreenOn);
  
      /**
       * Return NO_ERROR if the given package is installed on the device and enabled as a
       * VrListenerService for the given current user, or a negative error code indicating a failure.
       *
       * @param packageName the name of the package to check, or null to select the default package.
       * @return NO_ERROR if the given package is installed and is enabled, or a negative error code
       *       given in {@link android.service.vr.VrModeException} on failure.
       */
      public abstract int hasVrPackage(@NonNull ComponentName packageName, int userId);
  
      /**
       * Sets the resolution and DPI of the vr2d virtual display used to display
       * 2D applications in VR mode.
       *
       * <p>Requires {@link android.Manifest.permission#ACCESS_VR_MANAGER} permission.</p>
       *
       * @param vr2dDisplayProp Properties of the virtual display for 2D applications
       * in VR mode.
       */
      public abstract void setVr2dDisplayProperties(
              Vr2dDisplayProperties vr2dDisplayProp);
  
      /**
       * Sets the persistent VR mode state of a device. When a device is in persistent VR mode it will
       * remain in VR mode even if the foreground does not specify Vr mode being enabled. Mainly used
       * by VR viewers to indicate that a device is placed in a VR viewer.
       *
       * @param enabled true if the device should be placed in persistent VR mode.
       */
      public abstract void setPersistentVrModeEnabled(boolean enabled);
  
      /**
       * Return {@link android.view.Display.INVALID_DISPLAY} if there exists no virtual display
       * currently or the display id of the current virtual display.
       *
       * @return {@link android.view.Display.INVALID_DISPLAY} if there is no virtual display
       * currently, else return the display id of the virtual display
       */
      public abstract int getVr2dDisplayId();
  
      /**
       * Adds listener that reports state changes to persistent VR mode.
       */
      public abstract void addPersistentVrModeStateListener(IPersistentVrStateCallbacks listener);
  }
  