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flutter_ring_indicator
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implement inner ring.

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master
debuggerx 2 years ago
parent 5b9347acb7
commit 276874e07c
2 changed files with 153 additions and 31 deletions
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100
lib/main.dart
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@ -16,15 +16,9 @@ class MyApp extends StatelessWidget {
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
brightness: Brightness.dark,
),
home: const FittedBox(
fit: BoxFit.fitWidth,
child: SizedBox(
width: 720,
height: 1080,
child: MyHomePage(title: 'Flutter Demo Home Page'),
),
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
@ -39,11 +33,15 @@ class MyHomePage extends StatefulWidget {
}
class _MyHomePageState extends State<MyHomePage> {
double value = 0;
double value1 = 30;
double value2 = 50;
double value3 = 10;
void _incrementCounter() {
setState(() {
value = Random().nextDouble() * 100;
value1 = Random().nextDouble() * 100;
value2 = Random().nextDouble() * 100;
value3 = Random().nextDouble() * 100;
});
}
@ -58,23 +56,87 @@ class _MyHomePageState extends State<MyHomePage> {
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
SizedBox.square(
dimension: 100,
dimension: 200,
child: RingIndicator(
ringColor: Colors.deepPurpleAccent,
startAngel: pi * -0.7,
endAngel: pi * 0.7,
maxValue: 100,
value: value,
labelBuilder: (value) => Center(
value: value1,
labelBuilder: (values) {
return [
const Align(
alignment: Alignment.bottomCenter,
child: Text(
value.toStringAsFixed(1),
style: const TextStyle(color: Colors.teal, fontSize: 24),
)),
'CPU',
style: TextStyle(fontSize: 38),
),
),
Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Text(values.level(0)?.toStringAsFixed(1) ?? '/', style: const TextStyle(fontSize: 18)),
Text(values.level(1)?.toStringAsFixed(1) ?? '/', style: const TextStyle(fontSize: 24)),
Text(values.level(2)?.toStringAsFixed(1) ?? '/', style: const TextStyle(fontSize: 18)),
],
),
),
];
},
innerRing: RingIndicator(
startAngel: pi * -0.7,
endAngel: pi * 0.7,
maxValue: 100,
ringColor: Colors.teal,
value: value2,
innerRing: RingIndicator(
startAngel: pi * -0.7,
endAngel: pi * 0.7,
ringColor: Colors.amber,
maxValue: 100,
value: value3,
),
),
),
),
const SizedBox(height: 50),
SizedBox.square(
dimension: 200,
child: RingIndicator(
ringColor: Colors.teal,
startAngel: halfPi,
maxValue: 100,
value: value1,
labelBuilder: (values) => [
const Align(
alignment: Alignment.topRight,
child: Text('RAM', style: TextStyle(fontSize: 38, height: 1.8)),
),
Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Text(values.level(2)?.toStringAsFixed(1) ?? '/', style: const TextStyle(fontSize: 18)),
Text(values.level(1)?.toStringAsFixed(1) ?? '/', style: const TextStyle(fontSize: 24)),
Text(values.level(0)?.toStringAsFixed(1) ?? '/', style: const TextStyle(fontSize: 18)),
],
),
),
],
innerRing: RingIndicator(
ringColor: Colors.deepOrange,
startAngel: halfPi,
maxValue: 100,
value: value2,
innerRing: RingIndicator(
ringColor: Colors.indigoAccent,
startAngel: halfPi,
maxValue: 100,
value: value3,
),
),
),
Text(
'$value',
style: Theme.of(context).textTheme.headline4,
),
],
),

82
lib/ring_indicator.dart
Unescape View File

@ -6,12 +6,33 @@ import 'package:flutter/scheduler.dart';
const halfPi = pi / 2;
const pi = math.pi;
typedef LabelBuilder = Widget Function(double value);
typedef LabelBuilder = Iterable<Widget> Function(List<LevelValue> values);
extension LevelValueExt on List<LevelValue> {
double? level(int level) {
for (var element in this) {
if (element.level == level) return element.value;
}
return null;
}
}
@immutable
class LevelValue {
final double value;
final int level;
const LevelValue(this.value) : level = 0;
const LevelValue._withLevel(this.value, this.level);
LevelValue incrementLevel() => LevelValue._withLevel(value, level + 1);
}
class RingIndicator extends StatefulWidget {
const RingIndicator({
Key? key,
this.backgroundColor = Colors.grey,
this.backgroundColor = Colors.white12,
this.ringWidth = 10,
this.startAngel = 0,
this.endAngel = pi * 2,
@ -21,7 +42,9 @@ class RingIndicator extends StatefulWidget {
required this.value,
this.innerRing,
this.labelBuilder,
}) : super(key: key);
double? gap,
}) : gap = gap ?? ringWidth / 2,
super(key: key);
final Color backgroundColor;
final double ringWidth;
@ -33,19 +56,22 @@ class RingIndicator extends StatefulWidget {
final double value;
final RingIndicator? innerRing;
final LabelBuilder? labelBuilder;
final double gap;
@override
State<RingIndicator> createState() => _RingIndicatorState();
}
class _RingIndicatorState extends State<RingIndicator> {
double? _value = 0;
double _value = 0;
Map<int, LevelValue> values = {};
_RingIndicatorState? parent;
@override
Widget build(BuildContext context) {
var value = _value ?? widget.value;
var fillAngel =
((value - widget.minValue) / (widget.maxValue - widget.minValue)) * (widget.endAngel - widget.startAngel);
((_value - widget.minValue) / (widget.maxValue - widget.minValue)) * (widget.endAngel - widget.startAngel);
return Center(
child: SizedBox.expand(
child: CustomPaint(
@ -59,7 +85,12 @@ class _RingIndicatorState extends State<RingIndicator> {
),
child: Stack(
children: [
if (widget.labelBuilder != null) widget.labelBuilder!(value),
if (widget.innerRing != null)
Padding(
padding: EdgeInsets.all(widget.ringWidth + widget.gap),
child: widget.innerRing,
),
if (widget.labelBuilder != null) ...widget.labelBuilder!(values.values.toList()),
],
),
),
@ -69,9 +100,7 @@ class _RingIndicatorState extends State<RingIndicator> {
Ticker? ticker;
@override
void didUpdateWidget(RingIndicator oldWidget) {
super.didUpdateWidget(oldWidget);
_handleValueChange(double newValue, double oldValue) {
var startTime = DateTime.now();
ticker?.stop();
ticker = Ticker((_) {
@ -81,12 +110,43 @@ class _RingIndicatorState extends State<RingIndicator> {
}
if (mounted) {
setState(() {
_value = oldWidget.value + (widget.value - oldWidget.value) * (diff / 300);
_value = oldValue + (newValue - oldValue) * (diff / 300);
values[0] = LevelValue(_value);
});
if (parent != null) {
for (var value in values.values) {
parent!.updateValue(value.incrementLevel());
}
}
}
})
..start();
}
@override
void initState() {
super.initState();
_handleValueChange(widget.value, 0);
parent = context.findAncestorStateOfType<_RingIndicatorState>();
}
@override
void didUpdateWidget(RingIndicator oldWidget) {
super.didUpdateWidget(oldWidget);
_handleValueChange(widget.value, oldWidget.value);
}
void updateValue(LevelValue value) {
values[value.level] = value;
if (parent != null && parent!.mounted) {
for (var value in values.values) {
parent!.updateValue(value.incrementLevel());
}
}
if (mounted) {
setState(() {});
}
}
}
class _RingIndicatorPainter extends CustomPainter {

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