content: /*
   * Copyright (C) 2014 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;
  
  import android.content.Context;
  import android.graphics.Bitmap;
  import android.graphics.Canvas;
  import android.graphics.Color;
  import android.graphics.Paint;
  import android.graphics.Rect;
  import android.view.View;
  import android.view.ViewDebug;
  import android.view.ViewGroup;
  
  public class ClickShadowView extends View {
  
      private static final int SHADOW_SIZE_FACTOR = 3;
      private static final int SHADOW_LOW_ALPHA = 30;
      private static final int SHADOW_HIGH_ALPHA = 60;
  
      private final Paint mPaint;
  
      @ViewDebug.ExportedProperty(category = "launcher")
      private final float mShadowOffset;
      @ViewDebug.ExportedProperty(category = "launcher")
      private final float mShadowPadding;
  
      private Bitmap mBitmap;
  
      public ClickShadowView(Context context) {
          super(context);
          mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
          mPaint.setColor(Color.BLACK);
  
          mShadowPadding = getResources().getDimension(R.dimen.blur_size_click_shadow);
          mShadowOffset = getResources().getDimension(R.dimen.click_shadow_high_shift);
      }
  
      /**
       * @return extra space required by the view to show the shadow.
       */
      public int getExtraSize() {
          return (int) (SHADOW_SIZE_FACTOR * mShadowPadding);
      }
  
      /**
       * Applies the new bitmap.
       * @return true if the view was invalidated.
       */
      public boolean setBitmap(Bitmap b) {
          if (b != mBitmap){
              mBitmap = b;
              invalidate();
              return true;
          }
          return false;
      }
  
      @Override
      protected void onDraw(Canvas canvas) {
          if (mBitmap != null) {
              mPaint.setAlpha(SHADOW_LOW_ALPHA);
              canvas.drawBitmap(mBitmap, 0, 0, mPaint);
              mPaint.setAlpha(SHADOW_HIGH_ALPHA);
              canvas.drawBitmap(mBitmap, 0, mShadowOffset, mPaint);
          }
      }
  
      public void animateShadow() {
          setAlpha(0);
          animate().alpha(1)
              .setDuration(FastBitmapDrawable.CLICK_FEEDBACK_DURATION)
              .setInterpolator(FastBitmapDrawable.CLICK_FEEDBACK_INTERPOLATOR)
              .start();
      }
  
      /**
       * Aligns the shadow with {@param view}
       * @param viewParent immediate parent of {@param view}. It must be a sibling of this view.
       */
      public void alignWithIconView(BubbleTextView view, ViewGroup viewParent, View clipAgainstView) {
          float leftShift = view.getLeft() + viewParent.getLeft() - getLeft();
          float topShift = view.getTop() + viewParent.getTop() - getTop();
          int iconWidth = view.getRight() - view.getLeft();
          int iconHeight = view.getBottom() - view.getTop();
          int iconHSpace = iconWidth - view.getCompoundPaddingRight() - view.getCompoundPaddingLeft();
          float drawableWidth = view.getIcon().getBounds().width();
  
          if (clipAgainstView != null) {
              // Set the bounds to clip against
              int[] coords = new int[] {0, 0};
              Utilities.getDescendantCoordRelativeToAncestor(clipAgainstView, (View) getParent(),
                      coords, false);
              int clipLeft = (int) Math.max(0, coords[0] - leftShift - mShadowPadding);
              int clipTop = (int) Math.max(0, coords[1] - topShift - mShadowPadding) ;
              setClipBounds(new Rect(clipLeft, clipTop, clipLeft + iconWidth, clipTop + iconHeight));
          } else {
              // Reset the clip bounds
              setClipBounds(null);
          }
  
          setTranslationX(leftShift
                  + viewParent.getTranslationX()
                  + view.getCompoundPaddingLeft() * view.getScaleX()
                  + (iconHSpace - drawableWidth) * view.getScaleX() / 2  /* drawable gap */
                  + iconWidth * (1 - view.getScaleX()) / 2  /* gap due to scale */
                  - mShadowPadding  /* extra shadow size */
                  );
          setTranslationY(topShift
                  + viewParent.getTranslationY()
                  + view.getPaddingTop() * view.getScaleY()  /* drawable gap */
                  + view.getHeight() * (1 - view.getScaleY()) / 2  /* gap due to scale */
                  - mShadowPadding  /* extra shadow size */
                  );
      }
  }
  