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.launcher3.graphics;
  
  import static android.view.View.VISIBLE;
  
  import static com.android.launcher3.LauncherState.HOTSEAT_ICONS;
  import static com.android.launcher3.LauncherState.OVERVIEW;
  
  import android.graphics.Rect;
  import android.view.View;
  import android.view.ViewGroup;
  
  import androidx.annotation.NonNull;
  import androidx.annotation.Nullable;
  
  /**
   * View scrim which draws behind overview (recent apps).
   */
  public class OverviewScrim extends Scrim {
  
      private @NonNull View mStableScrimmedView;
      // Might be higher up if mStableScrimmedView is invisible.
      private @Nullable View mCurrentScrimmedView;
  
      public OverviewScrim(View view) {
          super(view);
          mStableScrimmedView = mCurrentScrimmedView = mLauncher.getOverviewPanel();
  
          onExtractedColorsChanged(mWallpaperColorInfo);
      }
  
      public void onInsetsChanged(Rect insets) {
          mStableScrimmedView = (OVERVIEW.getVisibleElements(mLauncher) & HOTSEAT_ICONS) != 0
                  ? mLauncher.getHotseat()
                  : mLauncher.getOverviewPanel();
      }
  
      public void updateCurrentScrimmedView(ViewGroup root) {
          // Find the lowest view that is at or above the view we want to show the scrim behind.
          mCurrentScrimmedView = mStableScrimmedView;
          int currentIndex = root.indexOfChild(mCurrentScrimmedView);
          final int childCount = root.getChildCount();
          while (mCurrentScrimmedView.getVisibility() != VISIBLE && currentIndex < childCount) {
              currentIndex++;
              mCurrentScrimmedView = root.getChildAt(currentIndex);
          }
      }
  
      /**
       * @return The view to draw the scrim behind.
       */
      public View getScrimmedView() {
          return mCurrentScrimmedView;
      }
  }
  