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- import 'package:flutter/material.dart';
-
- class FingerPainter extends CustomPainter {
- Paint _paint;
- double _fraction;
-
- FingerPainter(this._fraction) {
- _paint = Paint()
- ..color = Colors.blue
- ..strokeWidth = 10.0
- ..strokeCap = StrokeCap.round;
- }
-
- @override
- void paint(Canvas canvas, Size size) {
- print('paint $_fraction');
- canvas.drawLine(Offset(0.0, 0.0),
- Offset(size.width * _fraction, size.height * _fraction), _paint);
- canvas.drawLine(Offset(size.width, 0.0),
- Offset(size.width - size.width * _fraction, size.height * _fraction), _paint);
- }
-
- @override
- bool shouldRepaint(FingerPainter oldDelegate) {
- return oldDelegate._fraction != _fraction;
- }
- }
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