1/*
2 * Copyright (C) 2007 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 */
16
17package android.graphics.drawable.shapes;
18
19import android.annotation.Nullable;
20import android.graphics.Canvas;
21import android.graphics.Outline;
22import android.graphics.Paint;
23import android.graphics.Path;
24import android.graphics.RectF;
25
26/**
27 * Creates a rounded-corner rectangle. Optionally, an inset (rounded) rectangle
28 * can be included (to make a sort of "O" shape).
29 * <p>
30 * The rounded rectangle can be drawn to a Canvas with its own draw() method,
31 * but more graphical control is available if you instead pass
32 * the RoundRectShape to a {@link android.graphics.drawable.ShapeDrawable}.
33 */
34public class RoundRectShape extends RectShape {
35    private float[] mOuterRadii;
36    private RectF mInset;
37    private float[] mInnerRadii;
38
39    private RectF mInnerRect;
40    private Path mPath; // this is what we actually draw
41
42    /**
43     * RoundRectShape constructor.
44     * <p>
45     * Specifies an outer (round)rect and an optional inner (round)rect.
46     *
47     * @param outerRadii An array of 8 radius values, for the outer roundrect.
48     *                   The first two floats are for the top-left corner
49     *                   (remaining pairs correspond clockwise). For no rounded
50     *                   corners on the outer rectangle, pass {@code null}.
51     * @param inset A RectF that specifies the distance from the inner
52     *              rect to each side of the outer rect. For no inner, pass
53     *              {@code null}.
54     * @param innerRadii An array of 8 radius values, for the inner roundrect.
55     *                   The first two floats are for the top-left corner
56     *                   (remaining pairs correspond clockwise). For no rounded
57     *                   corners on the inner rectangle, pass {@code null}. If
58     *                   inset parameter is {@code null}, this parameter is
59     *                   ignored.
60     */
61    public RoundRectShape(@Nullable float[] outerRadii, @Nullable RectF inset,
62            @Nullable float[] innerRadii) {
63        if (outerRadii != null && outerRadii.length < 8) {
64            throw new ArrayIndexOutOfBoundsException("outer radii must have >= 8 values");
65        }
66        if (innerRadii != null && innerRadii.length < 8) {
67            throw new ArrayIndexOutOfBoundsException("inner radii must have >= 8 values");
68        }
69        mOuterRadii = outerRadii;
70        mInset = inset;
71        mInnerRadii = innerRadii;
72
73        if (inset != null) {
74            mInnerRect = new RectF();
75        }
76        mPath = new Path();
77    }
78
79    @Override
80    public void draw(Canvas canvas, Paint paint) {
81        canvas.drawPath(mPath, paint);
82    }
83
84    @Override
85    public void getOutline(Outline outline) {
86        if (mInnerRect != null) return; // have a hole, can't produce valid outline
87
88        float radius = 0;
89        if (mOuterRadii != null) {
90            radius = mOuterRadii[0];
91            for (int i = 1; i < 8; i++) {
92                if (mOuterRadii[i] != radius) {
93                    // can't call simple constructors, use path
94                    outline.setConvexPath(mPath);
95                    return;
96                }
97            }
98        }
99
100        final RectF rect = rect();
101        outline.setRoundRect((int) Math.ceil(rect.left), (int) Math.ceil(rect.top),
102                (int) Math.floor(rect.right), (int) Math.floor(rect.bottom), radius);
103    }
104
105    @Override
106    protected void onResize(float w, float h) {
107        super.onResize(w, h);
108
109        RectF r = rect();
110        mPath.reset();
111
112        if (mOuterRadii != null) {
113            mPath.addRoundRect(r, mOuterRadii, Path.Direction.CW);
114        } else {
115            mPath.addRect(r, Path.Direction.CW);
116        }
117        if (mInnerRect != null) {
118            mInnerRect.set(r.left + mInset.left, r.top + mInset.top,
119                           r.right - mInset.right, r.bottom - mInset.bottom);
120            if (mInnerRect.width() < w && mInnerRect.height() < h) {
121                if (mInnerRadii != null) {
122                    mPath.addRoundRect(mInnerRect, mInnerRadii, Path.Direction.CCW);
123                } else {
124                    mPath.addRect(mInnerRect, Path.Direction.CCW);
125                }
126            }
127        }
128    }
129
130    @Override
131    public RoundRectShape clone() throws CloneNotSupportedException {
132        final RoundRectShape shape = (RoundRectShape) super.clone();
133        shape.mOuterRadii = mOuterRadii != null ? mOuterRadii.clone() : null;
134        shape.mInnerRadii = mInnerRadii != null ? mInnerRadii.clone() : null;
135        shape.mInset = new RectF(mInset);
136        shape.mInnerRect = new RectF(mInnerRect);
137        shape.mPath = new Path(mPath);
138        return shape;
139    }
140}
141