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/*
* 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);
}
}
}
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