[go: nahoru, domu]
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.content.Context;
19import android.content.res.ColorStateList;
20import android.graphics.Canvas;
21import android.graphics.Paint;
22import android.graphics.Rect;
23import android.graphics.RectF;
24import android.support.annotation.ColorInt;
25import android.support.annotation.Nullable;
26
27class CardViewEclairMr1 implements CardViewImpl {
28
29    final RectF sCornerRect = new RectF();
30
31    @Override
32    public void initStatic() {
33        // Draws a round rect using 7 draw operations. This is faster than using
34        // canvas.drawRoundRect before JBMR1 because API 11-16 used alpha mask textures to draw
35        // shapes.
36        RoundRectDrawableWithShadow.sRoundRectHelper =
37                new RoundRectDrawableWithShadow.RoundRectHelper() {
38            @Override
39            public void drawRoundRect(Canvas canvas, RectF bounds, float cornerRadius,
40                    Paint paint) {
41                final float twoRadius = cornerRadius * 2;
42                final float innerWidth = bounds.width() - twoRadius - 1;
43                final float innerHeight = bounds.height() - twoRadius - 1;
44                if (cornerRadius >= 1f) {
45                    // increment corner radius to account for half pixels.
46                    float roundedCornerRadius = cornerRadius + .5f;
47                    sCornerRect.set(-roundedCornerRadius, -roundedCornerRadius, roundedCornerRadius,
48                            roundedCornerRadius);
49                    int saved = canvas.save();
50                    canvas.translate(bounds.left + roundedCornerRadius,
51                            bounds.top + roundedCornerRadius);
52                    canvas.drawArc(sCornerRect, 180, 90, true, paint);
53                    canvas.translate(innerWidth, 0);
54                    canvas.rotate(90);
55                    canvas.drawArc(sCornerRect, 180, 90, true, paint);
56                    canvas.translate(innerHeight, 0);
57                    canvas.rotate(90);
58                    canvas.drawArc(sCornerRect, 180, 90, true, paint);
59                    canvas.translate(innerWidth, 0);
60                    canvas.rotate(90);
61                    canvas.drawArc(sCornerRect, 180, 90, true, paint);
62                    canvas.restoreToCount(saved);
63                    //draw top and bottom pieces
64                    canvas.drawRect(bounds.left + roundedCornerRadius - 1f, bounds.top,
65                            bounds.right - roundedCornerRadius + 1f,
66                            bounds.top + roundedCornerRadius, paint);
67
68                    canvas.drawRect(bounds.left + roundedCornerRadius - 1f,
69                            bounds.bottom - roundedCornerRadius,
70                            bounds.right - roundedCornerRadius + 1f, bounds.bottom, paint);
71                }
72                // center
73                canvas.drawRect(bounds.left, bounds.top + cornerRadius,
74                        bounds.right, bounds.bottom - cornerRadius , paint);
75            }
76        };
77    }
78
79    @Override
80    public void initialize(CardViewDelegate cardView, Context context,
81            ColorStateList backgroundColor, float radius, float elevation, float maxElevation) {
82        RoundRectDrawableWithShadow background = createBackground(context, backgroundColor, radius,
83                elevation, maxElevation);
84        background.setAddPaddingForCorners(cardView.getPreventCornerOverlap());
85        cardView.setCardBackground(background);
86        updatePadding(cardView);
87    }
88
89    private RoundRectDrawableWithShadow createBackground(Context context,
90                    ColorStateList backgroundColor, float radius, float elevation,
91                    float maxElevation) {
92        return new RoundRectDrawableWithShadow(context.getResources(), backgroundColor, radius,
93                elevation, maxElevation);
94    }
95
96    @Override
97    public void updatePadding(CardViewDelegate cardView) {
98        Rect shadowPadding = new Rect();
99        getShadowBackground(cardView).getMaxShadowAndCornerPadding(shadowPadding);
100        cardView.setMinWidthHeightInternal((int) Math.ceil(getMinWidth(cardView)),
101                (int) Math.ceil(getMinHeight(cardView)));
102        cardView.setShadowPadding(shadowPadding.left, shadowPadding.top,
103                shadowPadding.right, shadowPadding.bottom);
104    }
105
106    @Override
107    public void onCompatPaddingChanged(CardViewDelegate cardView) {
108        // NO OP
109    }
110
111    @Override
112    public void onPreventCornerOverlapChanged(CardViewDelegate cardView) {
113        getShadowBackground(cardView).setAddPaddingForCorners(cardView.getPreventCornerOverlap());
114        updatePadding(cardView);
115    }
116
117    @Override
118    public void setBackgroundColor(CardViewDelegate cardView, @Nullable ColorStateList color) {
119        getShadowBackground(cardView).setColor(color);
120    }
121
122    public ColorStateList getBackgroundColor(CardViewDelegate cardView) {
123        return getShadowBackground(cardView).getColor();
124    }
125
126    @Override
127    public void setRadius(CardViewDelegate cardView, float radius) {
128        getShadowBackground(cardView).setCornerRadius(radius);
129        updatePadding(cardView);
130    }
131
132    @Override
133    public float getRadius(CardViewDelegate cardView) {
134        return getShadowBackground(cardView).getCornerRadius();
135    }
136
137    @Override
138    public void setElevation(CardViewDelegate cardView, float elevation) {
139        getShadowBackground(cardView).setShadowSize(elevation);
140    }
141
142    @Override
143    public float getElevation(CardViewDelegate cardView) {
144        return getShadowBackground(cardView).getShadowSize();
145    }
146
147    @Override
148    public void setMaxElevation(CardViewDelegate cardView, float maxElevation) {
149        getShadowBackground(cardView).setMaxShadowSize(maxElevation);
150        updatePadding(cardView);
151    }
152
153    @Override
154    public float getMaxElevation(CardViewDelegate cardView) {
155        return getShadowBackground(cardView).getMaxShadowSize();
156    }
157
158    @Override
159    public float getMinWidth(CardViewDelegate cardView) {
160        return getShadowBackground(cardView).getMinWidth();
161    }
162
163    @Override
164    public float getMinHeight(CardViewDelegate cardView) {
165        return getShadowBackground(cardView).getMinHeight();
166    }
167
168    private RoundRectDrawableWithShadow getShadowBackground(CardViewDelegate cardView) {
169        return ((RoundRectDrawableWithShadow) cardView.getCardBackground());
170    }
171}
172