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.os.Bundle;
  import android.util.SparseArray;
  import android.view.View;
  import android.view.View.AccessibilityDelegate;
  import android.view.accessibility.AccessibilityNodeInfo;
  import android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction;
  
  import com.android.launcher3.R;
  import com.android.launcher3.Utilities;
  import com.android.launcher3.Workspace;
  import com.android.launcher3.config.FeatureFlags;
  
  public class OverviewScreenAccessibilityDelegate extends AccessibilityDelegate {
  
      private static final int MOVE_BACKWARD = R.id.action_move_screen_backwards;
      private static final int MOVE_FORWARD = R.id.action_move_screen_forwards;
  
      private final SparseArray<AccessibilityAction> mActions = new SparseArray<>();
      private final Workspace mWorkspace;
  
      public OverviewScreenAccessibilityDelegate(Workspace workspace) {
          mWorkspace = workspace;
  
          Context context = mWorkspace.getContext();
          boolean isRtl = Utilities.isRtl(context.getResources());
          mActions.put(MOVE_BACKWARD, new AccessibilityAction(MOVE_BACKWARD,
                  context.getText(isRtl ? R.string.action_move_screen_right :
                      R.string.action_move_screen_left)));
          mActions.put(MOVE_FORWARD, new AccessibilityAction(MOVE_FORWARD,
                  context.getText(isRtl ? R.string.action_move_screen_left :
                      R.string.action_move_screen_right)));
      }
  
      @Override
      public boolean performAccessibilityAction(View host, int action, Bundle args) {
          if (host != null) {
              if (action == AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS ) {
                  int index = mWorkspace.indexOfChild(host);
                  mWorkspace.setCurrentPage(index);
              } else if (action == MOVE_FORWARD) {
                  movePage(mWorkspace.indexOfChild(host) + 1, host);
                  return true;
              } else if (action == MOVE_BACKWARD) {
                  movePage(mWorkspace.indexOfChild(host) - 1, host);
                  return true;
              }
          }
  
          return super.performAccessibilityAction(host, action, args);
      }
  
      private void movePage(int finalIndex, View view) {
          mWorkspace.onStartReordering();
          mWorkspace.removeView(view);
          mWorkspace.addView(view, finalIndex);
          mWorkspace.onEndReordering();
          mWorkspace.announceForAccessibility(mWorkspace.getContext().getText(R.string.screen_moved));
  
          mWorkspace.updateAccessibilityFlags();
          view.performAccessibilityAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
      }
  
      @Override
      public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
          super.onInitializeAccessibilityNodeInfo(host, info);
  
          int index = mWorkspace.indexOfChild(host);
          if (index < mWorkspace.getChildCount() - 1) {
              info.addAction(mActions.get(MOVE_FORWARD));
          }
  
          int startIndex = mWorkspace.numCustomPages() + (FeatureFlags.QSB_ON_FIRST_SCREEN ? 1 : 0);
          if (index > startIndex) {
              info.addAction(mActions.get(MOVE_BACKWARD));
          }
      }
  }
  