108 lines
3.1 KiB
Dart
108 lines
3.1 KiB
Dart
import 'package:flutter/material.dart';
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class DragWidget extends StatefulWidget {
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@override
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_DragWidgetState createState() => _DragWidgetState();
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}
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class _DragWidgetState extends State<DragWidget> {
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double _sliderValue = 0.0;
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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body: Stack(
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children: [
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Positioned.fill(
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child: CustomPaint(
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painter: CirclePainter(_sliderValue),
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),
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),
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Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Padding(
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padding: const EdgeInsets.only(top: 20.0, left: 20.0),
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child: Text(
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"${DateTime.now().toLocal()}",
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style: TextStyle(fontSize: 18),
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),
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),
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const Padding(
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padding: EdgeInsets.only(left: 20.0),
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child: Text(
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"How are you today?",
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style: TextStyle(fontSize: 22, fontWeight: FontWeight.bold),
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),
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),
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SizedBox(height: 32), // 2 line padding
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SliderTheme(
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data: SliderTheme.of(context).copyWith(
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trackShape: CustomTrackShape(),
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thumbShape: SliderComponentShape.noThumb,
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),
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child: Slider(
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min: 0.0,
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max: 100.0,
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value: _sliderValue,
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onChanged: (value) {
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setState(() {
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_sliderValue = value;
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});
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},
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),
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),
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if (_sliderValue > 0)
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Padding(
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padding: EdgeInsets.only(left: 20.0),
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child: Text(
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"${_sliderValue.toStringAsFixed(0)}%",
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style: TextStyle(fontSize: 18),
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),
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),
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],
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),
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],
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),
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);
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}
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}
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class CirclePainter extends CustomPainter {
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final double value;
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CirclePainter(this.value);
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@override
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void paint(Canvas canvas, Size size) {
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var paint = Paint()
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..color = Colors.blue.withOpacity(0.5)
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..style = PaintingStyle.fill;
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// Calculate circle radius based on slider value
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double radius = value * size.width / 100;
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canvas.drawCircle(Offset(80, 150), radius, paint);
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}
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@override
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bool shouldRepaint(covariant CustomPainter oldDelegate) => true;
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}
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class CustomTrackShape extends RoundedRectSliderTrackShape {
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@override
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Rect getPreferredRect({
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required RenderBox parentBox,
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Offset offset = Offset.zero,
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required SliderThemeData sliderTheme,
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bool isEnabled = false,
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bool isDiscrete = false,
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}) {
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final double trackHeight = sliderTheme.trackHeight ?? 4;
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final double trackLeft = offset.dx;
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final double trackTop =
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offset.dy + (parentBox.size.height - trackHeight) / 2;
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final double trackWidth = parentBox.size.width;
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return Rect.fromLTWH(trackLeft, trackTop, trackWidth, trackHeight);
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}
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}
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