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| 1 | +/// |
| 2 | +/// Created by NieBin on 2019年6月15日 |
| 3 | +/// Github: https://github.com/nb312 |
| 4 | +/// Email: niebin312@gmail.com |
| 5 | +/// |
| 6 | +import "package:flutter/material.dart"; |
| 7 | +import 'package:flutter_widgets/const/_const.dart'; |
| 8 | +import 'dart:math'; |
| 9 | + |
| 10 | +class PaintingPage extends StatefulWidget { |
| 11 | + @override |
| 12 | + _OpacityState createState() => _OpacityState(); |
| 13 | +} |
| 14 | + |
| 15 | +class _OpacityState extends State<PaintingPage> { |
| 16 | + Widget _opacity() => Container( |
| 17 | + constraints: BoxConstraints.expand(height: 100), |
| 18 | + child: Opacity( |
| 19 | + opacity: 0.7, |
| 20 | + child: Text( |
| 21 | + "Opacity", |
| 22 | + style: TextStyle(color: TEXT_BLACK), |
| 23 | + ), |
| 24 | + ), |
| 25 | + color: RED_LIGHT, |
| 26 | + ); |
| 27 | + |
| 28 | + Widget _transform() => Container( |
| 29 | + constraints: BoxConstraints.expand(height: 100), |
| 30 | + child: Transform.rotate( |
| 31 | + angle: pi / 2, |
| 32 | + child: Center( |
| 33 | + child: Text("Transform"), |
| 34 | + ), |
| 35 | + ), |
| 36 | + color: BLUE_LIGHT, |
| 37 | + ); |
| 38 | + |
| 39 | + Widget _decorated() => Container( |
| 40 | + constraints: BoxConstraints.expand(height: 100), |
| 41 | + child: DecoratedBox( |
| 42 | + position: DecorationPosition.foreground, |
| 43 | + decoration: ShapeDecoration( |
| 44 | + shape: StadiumBorder( |
| 45 | + side: BorderSide(color: TEXT_BLACK, width: 10), |
| 46 | + ), |
| 47 | + ), |
| 48 | + child: Container( |
| 49 | + color: PURPLE, |
| 50 | + child: Center( |
| 51 | + child: Text("DecoratedBox"), |
| 52 | + ), |
| 53 | + ))); |
| 54 | + |
| 55 | + Widget _fraction() => Container( |
| 56 | + constraints: BoxConstraints.expand(height: 100), |
| 57 | + child: FractionalTranslation( |
| 58 | + translation: Offset(0.3, 0.1), |
| 59 | + child: Container( |
| 60 | + color: BLUE_LIGHT, |
| 61 | + ), |
| 62 | + ), |
| 63 | + ); |
| 64 | + |
| 65 | + Widget _rotation() => Container( |
| 66 | + constraints: BoxConstraints.expand(height: 100), |
| 67 | + child: RotatedBox( |
| 68 | + quarterTurns: 3, |
| 69 | + child: Container( |
| 70 | + color: GREEN, |
| 71 | + child: Center( |
| 72 | + child: Text("RotatedBox"), |
| 73 | + ), |
| 74 | + ), |
| 75 | + ), |
| 76 | + ); |
| 77 | + |
| 78 | + Widget _clipOval() => Container( |
| 79 | + constraints: BoxConstraints.expand(height: 100), |
| 80 | + child: ClipOval( |
| 81 | + clipper: MyClipper(), |
| 82 | + child: Container( |
| 83 | + color: RED_LIGHT, |
| 84 | + ), |
| 85 | + ), |
| 86 | + ); |
| 87 | + |
| 88 | + Widget _clipPath() => Container( |
| 89 | + constraints: BoxConstraints.expand(height: 100), |
| 90 | + child: ClipPath( |
| 91 | + clipper: MPathClipper(), |
| 92 | + child: Container(color: PURPLE), |
| 93 | + ), |
| 94 | + ); |
| 95 | + |
| 96 | + Widget _clipRect() => Container( |
| 97 | + constraints: BoxConstraints.expand(height: 100), |
| 98 | + child: ClipRect( |
| 99 | + clipper: MyClipper(), |
| 100 | + child: Container( |
| 101 | + color: BLUE_DEEP, |
| 102 | + ), |
| 103 | + ), |
| 104 | + ); |
| 105 | + |
| 106 | + Widget _custom() => Container( |
| 107 | + constraints: BoxConstraints.expand(height: 200), |
| 108 | + child: CustomPaint( |
| 109 | + painter: MCustomPainter(), |
| 110 | + child: Center( |
| 111 | + child: Text("CustomPaint"), |
| 112 | + ), |
| 113 | + ), |
| 114 | + ); |
| 115 | + |
| 116 | + @override |
| 117 | + Widget build(BuildContext context) { |
| 118 | + return Scaffold( |
| 119 | + appBar: AppBar( |
| 120 | + title: Text("Hello world"), |
| 121 | + ), |
| 122 | + body: SingleChildScrollView( |
| 123 | + child: Column( |
| 124 | + children: <Widget>[ |
| 125 | + _opacity(), |
| 126 | + _transform(), |
| 127 | + _decorated(), |
| 128 | + _fraction(), |
| 129 | + _rotation(), |
| 130 | + _clipOval(), |
| 131 | + _clipPath(), |
| 132 | + _clipRect(), |
| 133 | + _custom(), |
| 134 | + ], |
| 135 | + ), |
| 136 | + ), |
| 137 | + ); |
| 138 | + } |
| 139 | +} |
| 140 | + |
| 141 | +class MCustomPainter extends CustomPainter { |
| 142 | + @override |
| 143 | + void paint(Canvas canvas, Size size) { |
| 144 | + canvas.drawCircle( |
| 145 | + Offset(size.width / 2, size.height / 2), |
| 146 | + 100, |
| 147 | + Paint() |
| 148 | + ..color = RED_LIGHT |
| 149 | + ..isAntiAlias = true |
| 150 | + ..strokeWidth = 10); |
| 151 | + } |
| 152 | + |
| 153 | + @override |
| 154 | + bool shouldRepaint(CustomPainter oldDelegate) { |
| 155 | + return true; |
| 156 | + } |
| 157 | +} |
| 158 | + |
| 159 | +class MPathClipper extends CustomClipper<Path> { |
| 160 | + @override |
| 161 | + Path getClip(Size size) { |
| 162 | + return Path() |
| 163 | + ..moveTo(100.0, 50.0) |
| 164 | + ..addArc( |
| 165 | + Rect.fromCenter( |
| 166 | + center: Offset(100.0, 50.0), height: 50.0, width: 50.0), |
| 167 | + 0, |
| 168 | + pi / 2); |
| 169 | + } |
| 170 | + |
| 171 | + @override |
| 172 | + bool shouldReclip(CustomClipper<Path> oldClipper) { |
| 173 | + return true; |
| 174 | + } |
| 175 | +} |
| 176 | + |
| 177 | +class MyClipper extends CustomClipper<Rect> { |
| 178 | + @override |
| 179 | + Rect getClip(Size size) { |
| 180 | + return Rect.fromCenter( |
| 181 | + center: Offset(50.0, 50.0), height: 100.0, width: 50.0); |
| 182 | + } |
| 183 | + |
| 184 | + @override |
| 185 | + bool shouldReclip(CustomClipper<Rect> oldClipper) { |
| 186 | + return true; |
| 187 | + } |
| 188 | +} |
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