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.discovery;
  
  import android.content.Context;
  import android.graphics.Canvas;
  import android.graphics.drawable.ClipDrawable;
  import android.graphics.drawable.Drawable;
  import android.util.AttributeSet;
  import android.view.Gravity;
  import android.view.View;
  
  import com.android.launcher3.R;
  
  /**
   * A simple rating view that shows stars with a rating from 0-5.
   */
  public class RatingView extends View {
  
      private static final float WIDTH_FACTOR = 0.9f;
      private static final int MAX_LEVEL = 10000;
      private static final int MAX_STARS = 5;
  
      private final Drawable mStarDrawable;
      private final int mColorGray;
      private final int mColorHighlight;
  
      private float rating;
  
      public RatingView(Context context) {
          this(context, null);
      }
  
      public RatingView(Context context, AttributeSet attrs) {
          this(context, attrs, 0);
      }
  
      public RatingView(Context context, AttributeSet attrs, int defStyle) {
          super(context, attrs, defStyle);
          mStarDrawable = getResources().getDrawable(R.drawable.ic_star_rating, null);
          mColorGray = 0x1E000000;
          mColorHighlight = 0x8A000000;
      }
  
      public void setRating(float rating) {
          this.rating = Math.min(Math.max(rating, 0), MAX_STARS);
      }
  
      @Override
      protected void onDraw(Canvas canvas) {
          drawStars(canvas, MAX_STARS, mColorGray);
          drawStars(canvas, rating, mColorHighlight);
      }
  
      private void drawStars(Canvas canvas, float stars, int color) {
          int fullWidth = getLayoutParams().width;
          int cellWidth = fullWidth / MAX_STARS;
          int starWidth = (int) (cellWidth * WIDTH_FACTOR);
          int padding = cellWidth - starWidth;
          int fullStars = (int) stars;
          float partialStarFactor = stars - fullStars;
  
          for (int i = 0; i < fullStars; i++) {
              int x = i * cellWidth + padding;
              Drawable star = mStarDrawable.getConstantState().newDrawable().mutate();
              star.setTint(color);
              star.setBounds(x, padding, x + starWidth, padding + starWidth);
              star.draw(canvas);
          }
          if (partialStarFactor > 0f) {
              int x = fullStars * cellWidth + padding;
              ClipDrawable star = new ClipDrawable(mStarDrawable,
                      Gravity.LEFT, ClipDrawable.HORIZONTAL);
              star.setTint(color);
              star.setLevel((int) (MAX_LEVEL * partialStarFactor));
              star.setBounds(x, padding, x + starWidth, padding + starWidth);
              star.draw(canvas);
          }
      }
  }
  