RoundRectDrawable.java revision bf43be6ab14db8489f924d1673951f0c49014605 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package android.support.v7.widget;
17
18import android.graphics.Canvas;
19import android.graphics.ColorFilter;
20import android.graphics.Outline;
21import android.graphics.Paint;
22import android.graphics.PixelFormat;
23import android.graphics.Rect;
24import android.graphics.RectF;
25import android.graphics.drawable.Drawable;
26
27/**
28 * Very simple drawable that draws a rounded rectangle background with arbitrary corners and also
29 * reports proper outline for L.
30 * <p>
31 * Simpler and uses less resources compared to GradientDrawable or ShapeDrawable.
32 */
33class RoundRectDrawable extends Drawable {
34    float mRadius;
35    final Paint mPaint;
36    final RectF mBounds;
37
38    public RoundRectDrawable(int backgroundColor, float radius) {
39        mRadius = radius;
40        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
41        mPaint.setColor(backgroundColor);
42        mBounds = new RectF();
43    }
44
45    @Override
46    public void draw(Canvas canvas) {
47        canvas.drawRoundRect(mBounds, mRadius, mRadius, mPaint);
48    }
49
50    @Override
51    protected void onBoundsChange(Rect bounds) {
52        super.onBoundsChange(bounds);
53        mBounds.set(bounds.left, bounds.top, bounds.right, bounds.bottom);
54    }
55
56    @Override
57    public void getOutline(Outline outline) {
58        outline.setRoundRect(getBounds(), mRadius);
59    }
60
61    public void setRadius(float radius) {
62        if (radius == mRadius) {
63            return;
64        }
65        mRadius = radius;
66        invalidateSelf();
67    }
68
69    @Override
70    public void setAlpha(int alpha) {
71        // not supported because older versions do not support
72    }
73
74    @Override
75    public void setColorFilter(ColorFilter cf) {
76        // not supported because older versions do not support
77    }
78
79    @Override
80    public int getOpacity() {
81        return PixelFormat.OPAQUE;
82    }
83
84    public float getRadius() {
85        return mRadius;
86    }
87}
88