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.dragndrop;
  
  import android.annotation.TargetApi;
  import android.graphics.Bitmap;
  import android.graphics.Canvas;
  import android.graphics.ColorFilter;
  import android.graphics.Matrix;
  import android.graphics.Paint;
  import android.graphics.Path;
  import android.graphics.PixelFormat;
  import android.graphics.Point;
  import android.graphics.drawable.AdaptiveIconDrawable;
  import android.graphics.drawable.ColorDrawable;
  import android.graphics.drawable.Drawable;
  import android.os.Build;
  import android.util.Log;
  
  import com.android.launcher3.Launcher;
  import com.android.launcher3.MainThreadExecutor;
  import com.android.launcher3.R;
  import com.android.launcher3.folder.FolderIcon;
  import com.android.launcher3.folder.PreviewBackground;
  import com.android.launcher3.util.Preconditions;
  
  import java.util.concurrent.Callable;
  
  /**
   * {@link AdaptiveIconDrawable} representation of a {@link FolderIcon}
   */
  @TargetApi(Build.VERSION_CODES.O)
  public class FolderAdaptiveIcon extends AdaptiveIconDrawable {
      private static final String TAG = "FolderAdaptiveIcon";
  
      private final Drawable mBadge;
      private final Path mMask;
  
      private FolderAdaptiveIcon(Drawable bg, Drawable fg, Drawable badge, Path mask) {
          super(bg, fg);
          mBadge = badge;
          mMask = mask;
      }
  
      @Override
      public Path getIconMask() {
          return mMask;
      }
  
      public Drawable getBadge() {
          return mBadge;
      }
  
      public static FolderAdaptiveIcon createFolderAdaptiveIcon(
              final Launcher launcher, final long folderId, Point dragViewSize) {
          Preconditions.assertNonUiThread();
          int margin = launcher.getResources()
                  .getDimensionPixelSize(R.dimen.blur_size_medium_outline);
  
          // Allocate various bitmaps on the background thread, because why not!
          final Bitmap badge = Bitmap.createBitmap(
                  dragViewSize.x - margin, dragViewSize.y - margin, Bitmap.Config.ARGB_8888);
  
          // The bitmap for the preview is generated larger than needed to allow for the spring effect
          float sizeScaleFactor = 1 + 2 * AdaptiveIconDrawable.getExtraInsetFraction();
          final Bitmap preview = Bitmap.createBitmap(
                  (int) (dragViewSize.x * sizeScaleFactor), (int) (dragViewSize.y * sizeScaleFactor),
                  Bitmap.Config.ARGB_8888);
  
          // Create the actual drawable on the UI thread to avoid race conditions with
          // FolderIcon draw pass
          try {
              return new MainThreadExecutor().submit(new Callable<FolderAdaptiveIcon>() {
                  @Override
                  public FolderAdaptiveIcon call() throws Exception {
                      FolderIcon icon = launcher.findFolderIcon(folderId);
                      return icon == null ? null : createDrawableOnUiThread(icon, badge, preview);
                  }
              }).get();
          } catch (Exception e) {
              Log.e(TAG, "Unable to create folder icon", e);
              return null;
          }
      }
  
      /**
       * Initializes various bitmaps on the UI thread and returns the final drawable.
       */
      private static FolderAdaptiveIcon createDrawableOnUiThread(FolderIcon icon,
              Bitmap badgeBitmap, Bitmap previewBitmap) {
          Preconditions.assertUIThread();
          float margin = icon.getResources().getDimension(R.dimen.blur_size_medium_outline) / 2;
  
          Canvas c = new Canvas();
          PreviewBackground bg = icon.getFolderBackground();
  
          // Initialize badge
          c.setBitmap(badgeBitmap);
          bg.drawShadow(c);
          bg.drawBackgroundStroke(c);
          icon.drawBadge(c);
  
          // Initialize preview
          float shiftFactor = AdaptiveIconDrawable.getExtraInsetFraction() /
                  (1 + 2 * AdaptiveIconDrawable.getExtraInsetFraction());
          float previewShiftX = shiftFactor * previewBitmap.getWidth();
          float previewShiftY = shiftFactor * previewBitmap.getHeight();
  
          c.setBitmap(previewBitmap);
          c.translate(previewShiftX, previewShiftY);
          icon.getPreviewItemManager().draw(c);
          c.setBitmap(null);
  
          // Initialize mask
          Path mask = new Path();
          Matrix m = new Matrix();
          m.setTranslate(margin, margin);
          bg.getClipPath().transform(m, mask);
  
          ShiftedBitmapDrawable badge = new ShiftedBitmapDrawable(badgeBitmap, margin, margin);
          ShiftedBitmapDrawable foreground = new ShiftedBitmapDrawable(previewBitmap,
                  margin - previewShiftX, margin - previewShiftY);
  
          return new FolderAdaptiveIcon(new ColorDrawable(bg.getBgColor()), foreground, badge, mask);
      }
  
      /**
       * A simple drawable which draws a bitmap at a fixed position irrespective of the bounds
       */
      private static class ShiftedBitmapDrawable extends Drawable {
  
          private final Paint mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
          private final Bitmap mBitmap;
          private final float mShiftX;
          private final float mShiftY;
  
          ShiftedBitmapDrawable(Bitmap bitmap, float shiftX, float shiftY) {
              mBitmap = bitmap;
              mShiftX = shiftX;
              mShiftY = shiftY;
          }
  
          @Override
          public void draw(Canvas canvas) {
              canvas.drawBitmap(mBitmap, mShiftX, mShiftY, mPaint);
          }
  
          @Override
          public void setAlpha(int i) { }
  
          @Override
          public void setColorFilter(ColorFilter colorFilter) {
              mPaint.setColorFilter(colorFilter);
          }
  
          @Override
          public int getOpacity() {
              return PixelFormat.TRANSLUCENT;
          }
      }
  }
  