content: /*
   * Copyright (C) 2017 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.launcher3.util;
  
  import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR;
  
  import android.app.Activity;
  import android.content.Context;
  import android.os.Handler;
  import android.os.IBinder;
  import android.os.Message;
  import android.view.inputmethod.InputMethodManager;
  
  /**
   * Utility class for offloading some class from UI thread
   */
  public class UiThreadHelper {
  
      private static Handler sHandler;
  
      private static final int MSG_HIDE_KEYBOARD = 1;
      private static final int MSG_SET_ORIENTATION = 2;
      private static final int MSG_RUN_COMMAND = 3;
  
      private static Handler getHandler(Context context) {
          if (sHandler == null) {
              sHandler = new Handler(UI_HELPER_EXECUTOR.getLooper(),
                      new UiCallbacks(context.getApplicationContext()));
          }
          return sHandler;
      }
  
      public static void hideKeyboardSync(Context context, IBinder token) {
          InputMethodManager imm = (InputMethodManager)
                  context.getSystemService(Context.INPUT_METHOD_SERVICE);
          imm.hideSoftInputFromWindow(token, 0);
      }
  
      public static void hideKeyboardAsync(Context context, IBinder token) {
          Message.obtain(getHandler(context), MSG_HIDE_KEYBOARD, token).sendToTarget();
      }
  
      public static void setOrientationAsync(Activity activity, int orientation) {
          Message.obtain(getHandler(activity), MSG_SET_ORIENTATION, orientation, 0, activity)
                  .sendToTarget();
      }
  
      public static void runAsyncCommand(Context context, AsyncCommand command, int arg1, int arg2) {
          Message.obtain(getHandler(context), MSG_RUN_COMMAND, arg1, arg2, command).sendToTarget();
      }
  
      private static class UiCallbacks implements Handler.Callback {
  
          private final InputMethodManager mIMM;
  
          UiCallbacks(Context context) {
              mIMM = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
          }
  
          @Override
          public boolean handleMessage(Message message) {
              switch (message.what) {
                  case MSG_HIDE_KEYBOARD:
                      mIMM.hideSoftInputFromWindow((IBinder) message.obj, 0);
                      return true;
                  case MSG_SET_ORIENTATION:
                      ((Activity) message.obj).setRequestedOrientation(message.arg1);
                      return true;
                  case MSG_RUN_COMMAND:
                      ((AsyncCommand) message.obj).execute(message.arg1, message.arg2);
                      return true;
              }
              return false;
          }
      }
  
      public interface AsyncCommand {
  
          void execute(int arg1, int arg2);
      }
  }
  