Created
September 16, 2021 04:35
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customPaint vs BoxPaint
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import 'package:flutter/material.dart'; | |
const Color darkBlue = Color.fromARGB(255, 18, 32, 47); | |
void main() { | |
runApp(MaterialApp( | |
home: MyApp(), | |
)); | |
} | |
class MyApp extends StatefulWidget { | |
@override | |
_MyAppState createState() => _MyAppState(); | |
} | |
class _MyAppState extends State<MyApp> { | |
@override | |
Widget build(BuildContext context) { | |
return SafeArea( | |
child: Scaffold( | |
body: Center( | |
child: Column( | |
mainAxisAlignment: MainAxisAlignment.center, | |
children: [ | |
SizedBox( | |
height: 300, | |
width: 300, | |
child: CustomPaint( | |
painter: MyCustomPainter(frameSFactor: .1, padding: 20), | |
child: const Center( | |
child: Text( | |
'Text', | |
style: TextStyle( | |
color: Colors.black, | |
fontSize: 30, | |
), | |
), | |
), | |
), | |
), | |
const SizedBox( | |
height: 20, | |
), | |
SizedBox( | |
width: 300, | |
height: 300, | |
child: Container( | |
height: 200, | |
width: 200, | |
alignment: Alignment.center, | |
decoration: const CustomDecoration( | |
frameSFactor: .1, | |
gap: 20, | |
), | |
child: const Text("a"), | |
), | |
), | |
], | |
), | |
), | |
), | |
); | |
} | |
} | |
class CustomDecoration extends Decoration { | |
final Color? backgroundColor; | |
final double frameSFactor; | |
//defalut padding _Need to check | |
final double gap; | |
const CustomDecoration({ | |
this.backgroundColor = Colors.transparent, | |
required this.frameSFactor, | |
required this.gap, | |
}); | |
@override | |
BoxPainter createBoxPainter([VoidCallback? onChanged]) { | |
return CustomDecorationPainter( | |
backgroundColor: backgroundColor!, | |
frameSFactor: frameSFactor, | |
padding: gap); | |
} | |
} | |
class CustomDecorationPainter extends BoxPainter { | |
final Color backgroundColor; | |
final double frameSFactor; | |
final double padding; | |
CustomDecorationPainter({ | |
required this.backgroundColor, | |
required this.frameSFactor, | |
required this.padding, | |
}); | |
@override | |
void paint(Canvas canvas, Offset offset, ImageConfiguration configuration) { | |
print(configuration.size!.height); | |
final Rect bounds = offset & configuration.size!; | |
final frameHWidth = configuration.size!.width * frameSFactor; | |
Paint paint = Paint() | |
..color = backgroundColor | |
..strokeCap = StrokeCap.round | |
..style = PaintingStyle.fill | |
..strokeWidth = 4; | |
/// background | |
canvas.drawRRect( | |
RRect.fromRectAndRadius( | |
bounds, | |
const Radius.circular(18), | |
), | |
paint..color = Colors.redAccent); | |
paint.color = Colors.black; | |
/// top left | |
canvas.drawLine( | |
bounds.topLeft + Offset(padding, padding), | |
Offset(bounds.topLeft.dx + frameHWidth, bounds.topLeft.dy) + | |
Offset(padding, padding), | |
paint, | |
); | |
canvas.drawLine( | |
bounds.topLeft + Offset(padding, padding), | |
Offset(bounds.topLeft.dx, bounds.topLeft.dy + frameHWidth) + | |
Offset(padding, padding), | |
paint, | |
); | |
//top Right | |
canvas.drawLine( | |
Offset(bounds.topRight.dx - padding, bounds.topRight.dy + padding), | |
Offset(bounds.topRight.dx - padding - frameHWidth, | |
bounds.topRight.dy + padding), | |
paint, | |
); | |
// canvas.drawLine( | |
// bounds.topLeft + Offset(padding, padding), | |
// Offset(bounds.topLeft.dx, bounds.topLeft.dy + frameHWidth) + | |
// Offset(padding, padding), | |
// paint, | |
// ); | |
} | |
} | |
class MyCustomPainter extends CustomPainter { | |
final double padding; | |
final double frameSFactor; | |
MyCustomPainter({ | |
required this.padding, | |
required this.frameSFactor, | |
}); | |
@override | |
void paint(Canvas canvas, Size size) { | |
final frameHWidth = size.width * frameSFactor; | |
Paint paint = Paint() | |
..color = Colors.redAccent | |
..strokeCap = StrokeCap.round | |
..style = PaintingStyle.fill | |
..strokeWidth = 4; | |
/// background | |
canvas.drawRRect( | |
RRect.fromRectAndRadius( | |
Rect.fromLTRB(0, 0, size.width, size.height), | |
Radius.circular(18), | |
), | |
paint); | |
/// top left | |
canvas.drawLine( | |
Offset(0 + padding, padding), | |
Offset( | |
padding + frameHWidth, | |
padding, | |
), | |
paint..color = Colors.black, | |
); | |
canvas.drawLine( | |
Offset(0 + padding, padding), | |
Offset( | |
padding, | |
padding + frameHWidth, | |
), | |
paint..color = Colors.black, | |
); | |
/// top Right | |
canvas.drawLine( | |
Offset(size.width - padding, padding), | |
Offset(size.width - padding - frameHWidth, padding), | |
paint..color = Colors.black, | |
); | |
canvas.drawLine( | |
Offset(size.width - padding, padding), | |
Offset(size.width - padding, padding + frameHWidth), | |
paint..color = Colors.black, | |
); | |
/// Bottom Right | |
canvas.drawLine( | |
Offset(size.width - padding, size.height - padding), | |
Offset(size.width - padding - frameHWidth, size.height - padding), | |
paint..color = Colors.black, | |
); | |
canvas.drawLine( | |
Offset(size.width - padding, size.height - padding), | |
Offset(size.width - padding, size.height - padding - frameHWidth), | |
paint..color = Colors.black, | |
); | |
/// Bottom Left | |
canvas.drawLine( | |
Offset(0 + padding, size.height - padding), | |
Offset(0 + padding + frameHWidth, size.height - padding), | |
paint..color = Colors.black, | |
); | |
canvas.drawLine( | |
Offset(0 + padding, size.height - padding), | |
Offset(0 + padding, size.height - padding - frameHWidth), | |
paint..color = Colors.black, | |
); | |
} | |
@override | |
bool shouldRepaint(covariant CustomPainter oldDelegate) { | |
return false; | |
} | |
} |
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