m3_lightmeter/lib/screens/timer/components/timeline/widget_timeline_timer.dart
2024-05-03 13:42:54 +02:00

142 lines
3.4 KiB
Dart

import 'dart:math';
import 'package:flutter/material.dart';
import 'package:lightmeter/res/dimens.dart';
class TimerTimeline extends StatelessWidget {
final double progress;
final Widget child;
const TimerTimeline({
required this.progress,
required this.child,
}) : assert(progress >= 0 && progress <= 1);
@override
Widget build(BuildContext context) {
return CustomPaint(
painter: _TimelinePainter(
backgroundColor: Theme.of(context).colorScheme.surface,
progressColor: Theme.of(context).colorScheme.primary,
progress: progress,
),
willChange: true,
child: Center(child: child),
);
}
}
class _TimelinePainter extends CustomPainter {
final Color progressColor;
final Color backgroundColor;
final double progress;
late final double timelineEdgeRadius = strokeWidth / 2;
static const double radiansQuarterTurn = -pi / 2;
static const double strokeWidth = Dimens.grid8;
_TimelinePainter({
required this.progressColor,
required this.backgroundColor,
required this.progress,
});
@override
void paint(Canvas canvas, Size size) {
late final double radiansProgress = 2 * pi * progress;
final radius = size.height / 2;
final timerCenter = Offset(radius, radius);
final timelineSegmentPath = Path();
if (progress == 1) {
timelineSegmentPath.addOval(
Rect.fromCenter(
center: timerCenter,
height: size.height,
width: size.width,
),
);
} else {
timelineSegmentPath
..arcTo(
Rect.fromCenter(
center: timerCenter,
height: size.height,
width: size.width,
),
radiansQuarterTurn,
radiansProgress,
false,
)
..lineTo(radius, radius)
..lineTo(radius, 0);
}
final timelinePath = Path.combine(
PathOperation.difference,
timelineSegmentPath,
Path()
..addOval(
Rect.fromCircle(
center: timerCenter,
radius: radius - strokeWidth,
),
),
);
final smoothEdgesPath = Path.combine(
PathOperation.union,
Path()
..addOval(
Rect.fromCircle(
center: Offset(radius, timelineEdgeRadius),
radius: timelineEdgeRadius,
),
),
Path()
..addOval(
Rect.fromCircle(
center: Offset(
(radius - timelineEdgeRadius) * cos(radiansProgress + radiansQuarterTurn) + radius,
(radius - timelineEdgeRadius) * sin(radiansProgress + radiansQuarterTurn) + radius,
),
radius: timelineEdgeRadius,
),
),
);
canvas.drawPath(
Path.combine(
PathOperation.difference,
Path()
..addOval(
Rect.fromCircle(
center: timerCenter,
radius: radius,
),
),
Path()
..addOval(
Rect.fromCircle(
center: timerCenter,
radius: radius - strokeWidth,
),
),
),
Paint()..color = backgroundColor,
);
canvas.drawPath(
timelinePath,
Paint()..color = progressColor,
);
canvas.drawPath(
smoothEdgesPath,
Paint()..color = progressColor,
);
}
@override
bool shouldRepaint(_TimelinePainter oldDelegate) => oldDelegate.progress != progress;
}