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 android.graphics.Bitmap;
  import android.graphics.Canvas;
  import android.graphics.ColorFilter;
  import android.graphics.Paint;
  import android.graphics.PixelFormat;
  import android.graphics.drawable.Drawable;
  
  /**
   * A simple drawable which draws a bitmap at a fixed position irrespective of the bounds
   */
  public class ShiftedBitmapDrawable extends Drawable {
  
      private final Paint mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
      private final Bitmap mBitmap;
      private float mShiftX;
      private float mShiftY;
  
      private final ConstantState mConstantState;
  
      public ShiftedBitmapDrawable(Bitmap bitmap, float shiftX, float shiftY) {
          mBitmap = bitmap;
          mShiftX = shiftX;
          mShiftY = shiftY;
  
          mConstantState = new MyConstantState(mBitmap, mShiftX, mShiftY);
      }
  
      public float getShiftX() {
          return mShiftX;
      }
  
      public float getShiftY() {
          return mShiftY;
      }
  
      public void setShiftX(float shiftX) {
          mShiftX = shiftX;
      }
  
      public void setShiftY(float shiftY) {
          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;
      }
  
      @Override
      public ConstantState getConstantState() {
          return mConstantState;
      }
  
      private static class MyConstantState extends ConstantState {
          private final Bitmap mBitmap;
          private float mShiftX;
          private float mShiftY;
  
          MyConstantState(Bitmap bitmap, float shiftX, float shiftY) {
              mBitmap = bitmap;
              mShiftX = shiftX;
              mShiftY = shiftY;
          }
  
          @Override
          public Drawable newDrawable() {
              return new ShiftedBitmapDrawable(mBitmap, mShiftX, mShiftY);
          }
  
          @Override
          public int getChangingConfigurations() {
              return 0;
          }
      }
  }