时钟小部件在拍打颤动时未更新其状态
1 [已附加图片网址] 2
int clockHours = 1; int clockMinutes = 1;
void updateHours(){
clockHours = clockHours +1;
}
void updateMinutess（）{ clockMinutes = clockMinutes +1;
}
1 个答案:
答案 0 :(得分：0)
您可以在下面复制粘贴运行完整代码
完整的代码已包含FlutterAnalogClock的更新源代码
FlutterAnalogClock的源代码需要添加didUpdateWidget
class _FlutterAnalogClockState extends State<FlutterAnalogClock> {
...
@override
void didUpdateWidget(FlutterAnalogClock oldWidget) {
super.didUpdateWidget(oldWidget);
if(widget.dateTime != oldWidget.dateTime) {
_dateTime = widget.dateTime;
}
}
使用它的代码段
...
FlutterAnalogClock(
showBorder: true,
showTicks: true,
showMinuteHand: true,
showSecondHand: false,
showNumber: true,
borderWidth: 10.0,
hourNumberScale: 1,
isLive: false,
width: 200.0,
height: 200.0,
decoration: const BoxDecoration(),
dateTime: DateTime(2019, 1, 1, clockHours, clockMinutes, 15),
),
RaisedButton(
onPressed: () {
clockHours = clockHours + 1;
setState(() {
});
},
child: Text("+ Hour"))
工作演示
完整代码
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter/cupertino.dart';
import 'dart:math';
import 'dart:ui';
class FlutterAnalogClockPainter extends CustomPainter {
static const List<String> defaultHourNumbers = [
'1',
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
'10',
'11',
'12'
];
final DateTime _datetime;
final Color dialPlateColor;
final Color hourHandColor;
final Color minuteHandColor;
final Color secondHandColor;
final Color numberColor;
final Color borderColor;
final Color tickColor;
final Color centerPointColor;
final bool showBorder;
final bool showTicks;
final bool showMinuteHand;
final bool showSecondHand;
final bool showNumber;
final double hourNumberScale;
final List<String> hourNumbers;
double _borderWidth;
final TextPainter _hourTextPainter = TextPainter(
textAlign: TextAlign.center,
textDirection: TextDirection.ltr,
);
FlutterAnalogClockPainter(
this._datetime, {
this.dialPlateColor = Colors.transparent,
this.hourHandColor = Colors.black,
this.minuteHandColor = Colors.black,
this.secondHandColor = Colors.black,
this.numberColor = Colors.black,
this.borderColor = Colors.black,
this.tickColor = Colors.black,
this.centerPointColor = Colors.black,
this.showBorder = true,
this.showTicks = true,
this.showMinuteHand = true,
this.showSecondHand = true,
this.showNumber = true,
this.hourNumberScale = 1.0,
this.hourNumbers = defaultHourNumbers,
double borderWidth,
}) : assert(hourNumbers == null || hourNumbers.length == 12),
_borderWidth = borderWidth;
@override
void paint(Canvas canvas, Size size) {
//clock radius
final radius = min(size.width, size.height) / 2;
//clock circumference
final double borderWidth =
showBorder ? (_borderWidth ?? radius / 20.0) : 0.0;
final double circumference = 2 * (radius - borderWidth) * pi;
canvas.translate(size.width / 2, size.height / 2);
canvas.drawCircle(
Offset(0, 0),
radius,
Paint()
..style = PaintingStyle.fill
..color = dialPlateColor);
// border style
if (showBorder && borderWidth > 0) {
Paint borderPaint = Paint()
..color = this.borderColor
..style = PaintingStyle.stroke
..strokeWidth = borderWidth
..isAntiAlias = true;
canvas.drawCircle(Offset(0, 0), radius - borderWidth / 2, borderPaint);
}
// setup tick
final double tickWidth = circumference / 200;
final double bigTickWidth = circumference / 120;
final double tickRadius = (radius - borderWidth - bigTickWidth);
if (showTicks) _paintTicks(canvas, tickRadius, tickWidth, bigTickWidth);
// setup numbers
final double numberRadius = tickRadius - bigTickWidth * 3;
double hourTextHeight = (radius - borderWidth) / 40 * 8 * hourNumberScale;
if (showNumber) {
hourTextHeight = _paintHourText(canvas, numberRadius, hourTextHeight);
}
_paintHourHand(
canvas, numberRadius - hourTextHeight, (radius - borderWidth) / 20);
if (showMinuteHand) {
_paintMinuteHand(canvas, numberRadius, (radius - borderWidth) / 40);
}
if (showSecondHand) {
_paintSecondHand(canvas, numberRadius + hourTextHeight / 2,
(radius - borderWidth) / 80);
}
//draw center point
Paint centerPointPaint = Paint()
..strokeWidth = ((radius - borderWidth) / 10)
..strokeCap = StrokeCap.round
..color = this.centerPointColor;
canvas.drawPoints(PointMode.points, [Offset(0, 0)], centerPointPaint);
}
/// draw ticks
void _paintTicks(
Canvas canvas, double radius, double tickWidth, double bigTickWidth) {
List<Offset> ticks = [];
List<Offset> bigTicks = [];
for (var i = 0; i < 60; i++) {
double _angle = i * 6.0;
if (i % 5 != 0) {
double x = cos(getRadians(_angle)) * radius;
double y = sin(getRadians(_angle)) * radius;
ticks.add(Offset(x, y));
} else {
double x = cos(getRadians(_angle)) * radius;
double y = sin(getRadians(_angle)) * radius;
bigTicks.add(Offset(x, y));
}
}
Paint tickPaint = Paint()
..color = this.tickColor
..strokeWidth = tickWidth
..strokeCap = StrokeCap.round;
canvas.drawPoints(PointMode.points, ticks, tickPaint);
Paint bigTickPaint = Paint()
..color = this.tickColor
..strokeWidth = bigTickWidth
..strokeCap = StrokeCap.round;
canvas.drawPoints(PointMode.points, bigTicks, bigTickPaint);
}
/// draw number（1 - 12）
double _paintHourText(Canvas canvas, double radius, double fontSize) {
double maxTextHeight = 0;
for (var i = 0; i < 12; i++) {
double _angle = i * 30.0;
canvas.save();
double hourNumberX = cos(getRadians(_angle)) * radius;
double hourNumberY = sin(getRadians(_angle)) * radius;
canvas.translate(hourNumberX, hourNumberY);
int intHour = i + 3;
if (intHour > 12) intHour = intHour - 12;
String hourText = hourNumbers[intHour - 1];
_hourTextPainter.text = TextSpan(
text: hourText,
style: TextStyle(fontSize: fontSize, color: this.numberColor),
);
_hourTextPainter.layout();
if (_hourTextPainter.height > maxTextHeight)
maxTextHeight = _hourTextPainter.height;
_hourTextPainter.paint(canvas,
Offset(-_hourTextPainter.width / 2, -_hourTextPainter.height / 2));
canvas.restore();
}
return maxTextHeight;
}
/// draw hour hand
void _paintHourHand(Canvas canvas, double radius, double strokeWidth) {
double angle = _datetime.hour % 12 + _datetime.minute / 60.0 - 3;
Offset handOffset = Offset(cos(getRadians(angle * 30)) * radius,
sin(getRadians(angle * 30)) * radius);
final hourHandPaint = Paint()
..color = this.hourHandColor
..strokeWidth = strokeWidth;
canvas.drawLine(Offset(0, 0), handOffset, hourHandPaint);
}
/// draw minute hand
void _paintMinuteHand(Canvas canvas, double radius, double strokeWidth) {
double angle = _datetime.minute - 15.0;
Offset handOffset = Offset(cos(getRadians(angle * 6.0)) * radius,
sin(getRadians(angle * 6.0)) * radius);
final hourHandPaint = Paint()
..color = this.minuteHandColor
..strokeWidth = strokeWidth;
canvas.drawLine(Offset(0, 0), handOffset, hourHandPaint);
}
/// draw second hand
void _paintSecondHand(Canvas canvas, double radius, double strokeWidth) {
double angle = _datetime.second - 15.0;
Offset handOffset = Offset(cos(getRadians(angle * 6.0)) * radius,
sin(getRadians(angle * 6.0)) * radius);
final hourHandPaint = Paint()
..color = this.secondHandColor
..strokeWidth = strokeWidth;
canvas.drawLine(Offset(0, 0), handOffset, hourHandPaint);
}
@override
bool shouldRepaint(FlutterAnalogClockPainter oldDelegate) {
return _datetime != oldDelegate._datetime ||
dialPlateColor != oldDelegate.dialPlateColor ||
hourHandColor != oldDelegate.hourHandColor ||
minuteHandColor != oldDelegate.minuteHandColor ||
secondHandColor != oldDelegate.secondHandColor ||
tickColor != oldDelegate.tickColor ||
numberColor != oldDelegate.numberColor ||
borderColor != oldDelegate.borderColor ||
centerPointColor != oldDelegate.centerPointColor ||
showBorder != oldDelegate.showBorder ||
showTicks != oldDelegate.showTicks ||
showMinuteHand != oldDelegate.showMinuteHand ||
showSecondHand != oldDelegate.showSecondHand ||
showNumber != oldDelegate.showNumber ||
hourNumbers != oldDelegate.hourNumbers ||
_borderWidth != oldDelegate._borderWidth ||
hourNumberScale != oldDelegate.hourNumberScale;
}
static double getRadians(double angle) {
return angle * pi / 180;
}
}
/// A analog clock.
class FlutterAnalogClock extends StatefulWidget {
final DateTime dateTime;
final Color dialPlateColor;
final Color hourHandColor;
final Color minuteHandColor;
final Color secondHandColor;
final Color numberColor;
final Color borderColor;
final Color tickColor;
final Color centerPointColor;
final bool showBorder;
final bool showTicks;
final bool showMinuteHand;
final bool showSecondHand;
final bool showNumber;
final double borderWidth;
final double hourNumberScale;
final List<String> hourNumbers;
final bool isLive;
final double width;
final double height;
final BoxDecoration decoration;
final Widget child;
const FlutterAnalogClock(
{this.dateTime,
this.dialPlateColor = Colors.white,
this.hourHandColor = Colors.black,
this.minuteHandColor = Colors.black,
this.secondHandColor = Colors.black,
this.numberColor = Colors.black,
this.borderColor = Colors.black,
this.tickColor = Colors.black,
this.centerPointColor = Colors.black,
this.showBorder = true,
this.showTicks = true,
this.showMinuteHand = true,
this.showSecondHand = true,
this.showNumber = true,
this.borderWidth,
this.hourNumberScale = 1.0,
this.hourNumbers = FlutterAnalogClockPainter.defaultHourNumbers,
this.isLive = true,
this.width = double.infinity,
this.height = double.infinity,
this.decoration = const BoxDecoration(),
this.child,
Key key})
: super(key: key);
const FlutterAnalogClock.dark(
{this.dateTime,
this.dialPlateColor = Colors.black,
this.hourHandColor = Colors.grey,
this.minuteHandColor = Colors.grey,
this.secondHandColor = Colors.grey,
this.numberColor = Colors.grey,
this.borderColor = Colors.black,
this.tickColor = Colors.grey,
this.centerPointColor = Colors.grey,
this.showBorder = true,
this.showTicks = true,
this.showMinuteHand = true,
this.showSecondHand = true,
this.showNumber = true,
this.borderWidth,
this.hourNumberScale = 1.0,
this.hourNumbers = FlutterAnalogClockPainter.defaultHourNumbers,
this.isLive = true,
this.width = double.infinity,
this.height = double.infinity,
this.decoration = const BoxDecoration(),
this.child,
Key key})
: super(key: key);
@override
_FlutterAnalogClockState createState() =>
_FlutterAnalogClockState(this.dateTime);
}
class _FlutterAnalogClockState extends State<FlutterAnalogClock> {
Timer _timer;
DateTime _dateTime;
_FlutterAnalogClockState(this._dateTime);
@override
void initState() {
super.initState();
if (!widget.isLive && this._dateTime == null)
this._dateTime = DateTime.now();
_timer = widget.isLive
? Timer.periodic(Duration(seconds: 1), (Timer timer) {
_dateTime = _dateTime?.add(Duration(seconds: 1));
if (mounted) {
setState(() {});
}
})
: null;
}
@override
void didUpdateWidget(FlutterAnalogClock oldWidget) {
super.didUpdateWidget(oldWidget);
if (widget.dateTime != oldWidget.dateTime) {
_dateTime = widget.dateTime;
}
}
@override
Widget build(BuildContext context) {
return Container(
width: widget.width,
height: widget.height,
decoration: widget.decoration,
child: CustomPaint(
child: widget.child,
painter: FlutterAnalogClockPainter(
_dateTime ?? DateTime.now(),
dialPlateColor: widget.dialPlateColor,
hourHandColor: widget.hourHandColor,
minuteHandColor: widget.minuteHandColor,
secondHandColor: widget.secondHandColor,
numberColor: widget.numberColor,
borderColor: widget.borderColor,
tickColor: widget.tickColor,
centerPointColor: widget.centerPointColor,
showBorder: widget.showBorder,
showTicks: widget.showTicks,
showMinuteHand: widget.showMinuteHand,
showSecondHand: widget.showSecondHand,
showNumber: widget.showNumber,
borderWidth: widget.borderWidth,
hourNumberScale: widget.hourNumberScale,
hourNumbers: widget.hourNumbers,
),
),
);
}
@override
void dispose() {
_timer?.cancel();
super.dispose();
}
}
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: TimePicker(),
);
}
}
class TimePicker extends StatefulWidget {
@override
_TimePickerState createState() => _TimePickerState();
}
class _TimePickerState extends State<TimePicker> {
@override
void initState() {
//********************************************************************
generateRandomTime();
super.initState();
}
// local variables
var buttonTime;
var buttonHours;
var buttonMinutes;
int clockHours = 1;
int clockMinutes = 1;
DateTime _dateTime = DateTime(2019, 1, 1, 1, 1, 15);
void incrementHours() {
setState(() {
_dateTime = _dateTime.add(Duration(hours: 1));
});
print(_dateTime.toString());
}
void incrementMinutes() {
setState(() {
_dateTime = _dateTime.add(Duration(minutes: 1));
});
print(_dateTime.toString());
}
void decrementHours() {
setState(() {
_dateTime = _dateTime.subtract(Duration(hours: 1));
});
print(_dateTime.toString());
}
void decrementMinutes() {
setState(() {
_dateTime = _dateTime.subtract(Duration(minutes: 1));
});
print(_dateTime.toString());
}
List<Color> clockColorArray = [
Color(0xff787878),
];
void generateRandomTime()
//********************************************************************
{
buttonHours = Random().nextInt(11) + 1;
buttonMinutes = Random().nextInt(58) + 1;
var hoursZero = buttonHours < 10 ? "0" : "";
var minutesZero = buttonMinutes < 10 ? "0" : "";
buttonTime = hoursZero +
buttonHours.toString() +
" " +
':' +
" " +
minutesZero +
buttonMinutes.toString() +
" Uhr";
}
void checkTime() {}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
SizedBox(
height: 10,
),
Container(
width: 300,
height: 70,
alignment: Alignment.center,
decoration: BoxDecoration(
color: Color(0xff69a7b6),
borderRadius: BorderRadius.circular(10),
),
child: Text(
buttonTime,
style: TextStyle(
color: Colors.white,
fontSize: 40.0,
fontWeight: FontWeight.bold,
fontFamily: 'TickingTimebombBB',
),
),
),
FlutterAnalogClock(
showBorder: true,
showTicks: true,
hourNumbers: [
'1',
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
'10',
'11',
'12'
],
showMinuteHand: true,
showSecondHand: false,
showNumber: true,
borderWidth: 10.0,
hourNumberScale: 1,
isLive: false,
width: 200.0,
height: 200.0,
decoration: const BoxDecoration(),
dateTime: _dateTime,
),
Column(
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
MaterialButton(
minWidth: 100.0,
height: 70.0,
textColor: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.all(Radius.circular(10.0))),
color: Color(0xff69a7b6),
onPressed: () {
incrementHours();
},
child: Text(
'+ Hour',
style: TextStyle(
fontSize: 25.0,
),
),
),
SizedBox(
width: 10,
),
MaterialButton(
minWidth: 100.0,
height: 70.0,
textColor: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.all(Radius.circular(10.0))),
color: Color(0xff69a7b6),
onPressed: () {
incrementMinutes();
},
child: Text(
'+ Min',
style: TextStyle(
fontSize: 25.0,
),
),
),
],
),
SizedBox(
height: 10,
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
MaterialButton(
minWidth: 100.0,
height: 70.0,
textColor: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.all(Radius.circular(10.0))),
color: Color(0xff69a7b6),
onPressed: () {
decrementHours();
},
child: Text(
'- Hour',
style: TextStyle(
fontSize: 25.0,
),
),
),
SizedBox(
width: 10,
),
MaterialButton(
minWidth: 100.0,
height: 70.0,
textColor: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.all(Radius.circular(10.0))),
color: Color(0xff69a7b6),
onPressed: () {
decrementMinutes();
},
child: Text(
'- Min',
style: TextStyle(
fontSize: 25.0,
),
),
),
],
),
],
),
GestureDetector(
onTap: () {
setState(() {
//checkTime();
});
},
child: Container(
width: 180,
height: 70,
decoration: BoxDecoration(
color: Color(0xffE0E0E0),
borderRadius: BorderRadius.circular(10),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Text(
('Check'),
style: TextStyle(color: Colors.black, fontSize: 25.0),
),
SizedBox(
width: 25,
),
Icon(
Icons.check,
color: Colors.blueAccent,
size: 30.0,
)
],
),
),
)
],
)),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
int clockHours = 1;
int clockMinutes = 1;
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
FlutterAnalogClock(
showBorder: true,
showTicks: true,
showMinuteHand: true,
showSecondHand: false,
showNumber: true,
borderWidth: 10.0,
hourNumberScale: 1,
isLive: false,
width: 200.0,
height: 200.0,
decoration: const BoxDecoration(),
dateTime: DateTime(2019, 1, 1, clockHours, clockMinutes, 15),
),
RaisedButton(
onPressed: () {
clockHours = clockHours + 1;
setState(() {});
},
child: Text("+ Hour")),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
相关问题
最新问题
- 我写了这段代码，但我无法理解我的错误
- 我无法从一个代码实例的列表中删除 None 值，但我可以在另一个实例中。为什么它适用于一个细分市场而不适用于另一个细分市场？
- 是否有可能使 loadstring 不可能等于打印？卢阿
- java中的random.expovariate()
- Appscript 通过会议在 Google 日历中发送电子邮件和创建活动
- 为什么我的 Onclick 箭头功能在 React 中不起作用？
- 在此代码中是否有使用“this”的替代方法？
- 在 SQL Server 和 PostgreSQL 上查询，我如何从第一个表获得第二个表的可视化
- 每千个数字得到
- 更新了城市边界 KML 文件的来源？