1 /*
2  * Copyright (C) 2018 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 
17 package com.android.layoutlib.bridge.impl;
18 
19 import android.content.Context;
20 import android.graphics.Canvas;
21 import android.graphics.Color;
22 import android.graphics.Paint;
23 import android.graphics.Path;
24 import android.util.DisplayMetrics;
25 import android.util.TypedValue;
26 import android.view.View;
27 
28 class SysUiOverlay extends View {
29     private final Path mCornerPath;
30     private final Path mNotchPath;
31     private final Paint mCornerPaint;
32     private final Paint mNotchPaint;
33     private final int mNotchTopWidth;
34 
35 
createCornerPath(float width, float height, float r)36     private static Path createCornerPath(float width, float height, float r) {
37         Path corner = new Path();
38         corner.moveTo(0, 0);
39         corner.lineTo(width, 0);
40         corner.cubicTo(width, 0, width /2 - r, height /2 - r, 0, height);
41         corner.close();
42 
43         return corner;
44     }
45 
createNotchPath(float topWidth, float bottomWidth, float height, float r)46     private static Path createNotchPath(float topWidth, float bottomWidth, float height, float r) {
47         Path corner = new Path();
48         corner.moveTo(0, 0);
49         float widthDiff = topWidth - bottomWidth;
50         corner.lineTo(topWidth, 0);
51         corner.lineTo(topWidth - widthDiff/2, height);
52         corner.lineTo(widthDiff/2, height);
53         corner.close();
54 
55         return corner;
56     }
57 
58 
dpToPx(DisplayMetrics metrics, float value)59     private static float dpToPx(DisplayMetrics metrics, float value) {
60         return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, value, metrics);
61     }
62 
63 
SysUiOverlay(Context context, int cornerSizeDp, int radiusDp, int topNotchWidthDp, int bottomNotchWidthDp, int notchHeightDp)64     public SysUiOverlay(Context context, int cornerSizeDp, int radiusDp, int topNotchWidthDp, int bottomNotchWidthDp, int notchHeightDp) {
65         super(context);
66 
67         DisplayMetrics metrics = context.getResources().getDisplayMetrics();
68 
69         float cornerSizePx = dpToPx(metrics, cornerSizeDp);
70         float radiusPx = dpToPx(metrics, radiusDp);
71 
72         float topNotchWidthPx = dpToPx(metrics, topNotchWidthDp);
73         float bottomNotchWidthPx = dpToPx(metrics, bottomNotchWidthDp);
74         float notchHeightPx = dpToPx(metrics, notchHeightDp);
75 
76         mCornerPath = createCornerPath(cornerSizePx, cornerSizePx, radiusPx);
77         mNotchPath = createNotchPath(topNotchWidthPx, bottomNotchWidthPx, notchHeightPx, 0);
78         mNotchTopWidth = topNotchWidthDp;
79 
80         mCornerPaint = new Paint();
81         mCornerPaint.setColor(Color.BLACK);
82         mCornerPaint.setStrokeWidth(0);
83         mCornerPaint.setAntiAlias(true);
84 
85         mNotchPaint = new Paint();
86         mNotchPaint.setColor(Color.BLACK);
87         mNotchPaint.setStrokeWidth(0);
88         mNotchPaint.setAntiAlias(true);
89     }
90 
setCornerColor(int color)91     public void setCornerColor(int color) {
92         mCornerPaint.setColor(color);
93     }
94 
setNotchColor(int color)95     public void setNotchColor(int color) {
96         mNotchPaint.setColor(color);
97     }
98 
paintRoundedBorders(Canvas canvas)99     private void paintRoundedBorders(Canvas canvas) {
100         // Top left
101         canvas.drawPath(mCornerPath, mCornerPaint);
102         // Top right
103         canvas.save();
104         canvas.translate(getWidth(), 0);
105         canvas.rotate(90);
106         canvas.drawPath(mCornerPath, mCornerPaint);
107         canvas.restore();
108         // Bottom right
109         canvas.save();
110         canvas.translate( getWidth(), getHeight());
111         canvas.rotate(180);
112         canvas.drawPath(mCornerPath, mCornerPaint);
113         canvas.restore();
114         // Bottom left
115         canvas.save();
116         canvas.translate( 0, getHeight());
117         canvas.rotate(270);
118         canvas.drawPath(mCornerPath, mCornerPaint);
119         canvas.restore();
120     }
121 
paintNotch(Canvas canvas)122     private void paintNotch(Canvas canvas) {
123         canvas.translate(getWidth() / 2 - mNotchTopWidth / 2, 0);
124         canvas.drawPath(mNotchPath, mNotchPaint);
125     }
126 
127     @Override
onDraw(Canvas canvas)128     protected void onDraw(Canvas canvas) {
129         paintRoundedBorders(canvas);
130         paintNotch(canvas);
131 
132     }
133 }