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Merged
merged 1 commit into from
May 17, 2021
Merged

changed the sample #4

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67 changes: 49 additions & 18 deletions lib/main.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -31,18 +31,15 @@ class _MyHomePageState extends State<MyHomePage> {

Future loadSalesData() async {
String jsonString = await rootBundle.loadString('assets/data.json');
final jsonResponse = json.decode(jsonString);
setState(() {
for (Map<String, dynamic> i in jsonResponse) {
chartData.add(SalesData.fromJson(i));
}
});
final dynamic jsonResponse = json.decode(jsonString);
for (Map<String, dynamic> i in jsonResponse) {
chartData.add(SalesData.fromJson(i));
}
}

@override
void initState() {
super.initState();
loadSalesData();
}

@override
Expand All @@ -51,17 +48,51 @@ class _MyHomePageState extends State<MyHomePage> {
appBar: AppBar(
title: const Text('Syncfusion Flutter chart'),
),
body: SfCartesianChart(
primaryXAxis: CategoryAxis(),
// Chart title
title: ChartTitle(text: 'Half yearly sales analysis'),
series: <ChartSeries<SalesData, String>>[
LineSeries<SalesData, String>(
dataSource: chartData,
xValueMapper: (SalesData sales, _) => sales.month,
yValueMapper: (SalesData sales, _) => sales.sales,
)
]));
body: Center(
child: FutureBuilder(
future: loadSalesData(),
builder: (context, snapshot) {
if (chartData.isNotEmpty) {
return SfCartesianChart(
primaryXAxis: CategoryAxis(),
// Chart title
title: ChartTitle(text: 'Half yearly sales analysis'),
series: <ChartSeries<SalesData, String>>[
LineSeries<SalesData, String>(
dataSource: chartData,
xValueMapper: (SalesData sales, _) => sales.month,
yValueMapper: (SalesData sales, _) => sales.sales,
)
]);
} else {
return Card(
elevation: 5.0,
child: Container(
height: 100,
width: 400,
child: Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Text('Retriving JSON data...',
style: TextStyle(fontSize: 20.0)),
Container(
height: 40,
width: 40,
child: CircularProgressIndicator(
semanticsLabel: 'Retriving JSON data',
valueColor: AlwaysStoppedAnimation<Color>(
Colors.blueAccent),
backgroundColor: Colors.grey[300],
),
),
],
),
),
),
);
}
})));
}
}

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