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.launcher3.accessibility;
  
  import android.content.Context;
  import android.view.View;
  import android.view.accessibility.AccessibilityEvent;
  import android.view.accessibility.AccessibilityManager;
  
  import com.android.launcher3.Launcher;
  
  /**
   * Periodically sends accessibility events to announce ongoing state changed. Based on the
   * implementation in ProgressBar.
   */
  public class DragViewStateAnnouncer implements Runnable {
  
      private static final int TIMEOUT_SEND_ACCESSIBILITY_EVENT = 200;
  
      private final View mTargetView;
  
      private DragViewStateAnnouncer(View view) {
          mTargetView = view;
      }
  
      public void announce(CharSequence msg) {
          mTargetView.setContentDescription(msg);
          mTargetView.removeCallbacks(this);
          mTargetView.postDelayed(this, TIMEOUT_SEND_ACCESSIBILITY_EVENT);
      }
  
      public void cancel() {
          mTargetView.removeCallbacks(this);
      }
  
      @Override
      public void run() {
          mTargetView.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
      }
  
      public void completeAction(int announceResId) {
          cancel();
          Launcher launcher = Launcher.getLauncher(mTargetView.getContext());
          launcher.getDragLayer().announceForAccessibility(launcher.getText(announceResId));
      }
  
      public static DragViewStateAnnouncer createFor(View v) {
          if (((AccessibilityManager) v.getContext().getSystemService(Context.ACCESSIBILITY_SERVICE))
                  .isEnabled()) {
              return new DragViewStateAnnouncer(v);
          } else {
              return null;
          }
      }
  }
  