content: /*
   * Copyright (C) 2018 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.quickstep.views;
  
  import android.content.Context;
  import android.graphics.Canvas;
  import android.graphics.drawable.Drawable;
  import android.util.AttributeSet;
  import android.view.View;
  
  import com.android.launcher3.FastBitmapDrawable;
  
  import java.util.ArrayList;
  
  import androidx.annotation.NonNull;
  
  /**
   * A view which draws a drawable stretched to fit its size. Unlike ImageView, it avoids relayout
   * when the drawable changes.
   */
  public class IconView extends View {
  
      public interface OnScaleUpdateListener {
          public void onScaleUpdate(float scale);
      }
  
      private Drawable mDrawable;
  
      private ArrayList<OnScaleUpdateListener> mScaleListeners;
  
      public IconView(Context context) {
          super(context);
      }
  
      public IconView(Context context, AttributeSet attrs) {
          super(context, attrs);
      }
  
      public IconView(Context context, AttributeSet attrs, int defStyleAttr) {
          super(context, attrs, defStyleAttr);
      }
  
      public void setDrawable(Drawable d) {
          if (mDrawable != null) {
              mDrawable.setCallback(null);
          }
          mDrawable = d;
          if (mDrawable != null) {
              mDrawable.setCallback(this);
              mDrawable.setBounds(0, 0, getWidth(), getHeight());
          }
          invalidate();
      }
  
      public Drawable getDrawable() {
          return mDrawable;
      }
  
      @Override
      protected void onSizeChanged(int w, int h, int oldw, int oldh) {
          super.onSizeChanged(w, h, oldw, oldh);
          if (mDrawable != null) {
              mDrawable.setBounds(0, 0, w, h);
          }
      }
  
      @Override
      protected boolean verifyDrawable(Drawable who) {
          return super.verifyDrawable(who) || who == mDrawable;
      }
  
      @Override
      protected void drawableStateChanged() {
          super.drawableStateChanged();
  
          final Drawable drawable = mDrawable;
          if (drawable != null && drawable.isStateful()
                  && drawable.setState(getDrawableState())) {
              invalidateDrawable(drawable);
          }
      }
  
      @Override
      public void invalidateDrawable(@NonNull Drawable drawable) {
          super.invalidateDrawable(drawable);
          if (drawable instanceof FastBitmapDrawable && mScaleListeners != null) {
              for (OnScaleUpdateListener listener : mScaleListeners) {
                  listener.onScaleUpdate(((FastBitmapDrawable) drawable).getScale());
              }
          }
      }
  
      @Override
      protected void onDraw(Canvas canvas) {
          if (mDrawable != null) {
              mDrawable.draw(canvas);
          }
      }
  
      @Override
      public boolean hasOverlappingRendering() {
          return false;
      }
  
      public void addUpdateScaleListener(OnScaleUpdateListener listener) {
          if (mScaleListeners == null) {
              mScaleListeners = new ArrayList<>();
          }
          mScaleListeners.add(listener);
          if (mDrawable instanceof FastBitmapDrawable) {
              listener.onScaleUpdate(((FastBitmapDrawable) mDrawable).getScale());
          }
      }
  
      public void removeUpdateScaleListener(OnScaleUpdateListener listener) {
          if (mScaleListeners != null) {
              mScaleListeners.remove(listener);
          }
      }
  }
  