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.graphics;
  
  import android.graphics.Canvas;
  import android.graphics.ColorFilter;
  import android.graphics.Matrix;
  import android.graphics.Outline;
  import android.graphics.Paint;
  import android.graphics.Path;
  import android.graphics.PixelFormat;
  import android.graphics.Rect;
  import android.graphics.drawable.Drawable;
  
  public class FastScrollThumbDrawable extends Drawable {
  
      private static final Matrix sMatrix = new Matrix();
  
      private final Path mPath = new Path();
      private final Paint mPaint;
      private final boolean mIsRtl;
  
      public FastScrollThumbDrawable(Paint paint, boolean isRtl) {
          mPaint = paint;
          mIsRtl = isRtl;
      }
  
      @Override
      public void getOutline(Outline outline) {
          if (mPath.isConvex()) {
              outline.setConvexPath(mPath);
          }
      }
  
      @Override
      protected void onBoundsChange(Rect bounds) {
          mPath.reset();
  
          float r = bounds.height()  * 0.5f;
          // The path represents a rotate tear-drop shape, with radius of one corner is 1/5th of the
          // other 3 corners.
          float diameter = 2 * r;
          float r2 = r / 5;
          mPath.addRoundRect(bounds.left, bounds.top, bounds.left + diameter, bounds.top + diameter,
                  new float[] {r, r, r, r, r2, r2, r, r},
                  Path.Direction.CCW);
  
          sMatrix.setRotate(-45, bounds.left + r, bounds.top + r);
          if (mIsRtl) {
              sMatrix.postTranslate(bounds.width(), 0);
              sMatrix.postScale(-1, 1, bounds.width(), 0);
          }
          mPath.transform(sMatrix);
      }
  
      @Override
      public void draw(Canvas canvas) {
          canvas.drawPath(mPath, mPaint);
      }
  
      @Override
      public void setAlpha(int i) {
          // Not supported
      }
  
      @Override
      public void setColorFilter(ColorFilter colorFilter) {
          // Not supported
      }
  
      @Override
      public int getOpacity() {
          return PixelFormat.TRANSLUCENT;
      }
  }
  