charts
Rtl Series Legend i18n Example
Example:
/// RTL Bar chart example
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';
class RTLSeriesLegend extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
RTLSeriesLegend(this.seriesList, {this.animate});
/// Creates a [BarChart] with sample data and no transition.
factory RTLSeriesLegend.withSampleData() {
return new RTLSeriesLegend(
_createSampleData(),
// Disable animations for image tests.
animate: false,
);
}
@override
Widget build(BuildContext context) {
// Charts will determine if RTL is enabled by checking the directionality by
// requesting Directionality.of(context). This returns the text direction
// from the closest instance of that encloses the context passed to build
// the chart. A [TextDirection.rtl] will be treated as a RTL chart. This
// means that the directionality widget does not have to directly wrap each
// chart. It is show here as an example only.
//
// When the legend behavior detects RTL:
// [BehaviorPosition.start] is to the right of the chart.
// [BehaviorPosition.end] is to the left of the chart.
//
// If the [BehaviorPosition] is top or bottom, the start justification
// is to the right, and the end justification is to the left.
//
// The legend's tabular layout will also layout rows and columns from right
// to left.
//
// The below example changes the position to 'start' and max rows of 2 in
// order to show these effects, but are not required for SeriesLegend to
// work with the correct directionality.
return new Directionality(
textDirection: TextDirection.rtl,
child: new charts.BarChart(
seriesList,
animate: animate,
behaviors: [
new charts.SeriesLegend(
position: charts.BehaviorPosition.end, desiredMaxRows: 2)
],
));
}
/// Create series list with multiple series
static List<charts.Series<OrdinalSales, String>> _createSampleData() {
final desktopSalesData = [
new OrdinalSales('2014', 5),
new OrdinalSales('2015', 25),
new OrdinalSales('2016', 100),
new OrdinalSales('2017', 75),
];
final tabletSalesData = [
new OrdinalSales('2014', 25),
new OrdinalSales('2015', 50),
new OrdinalSales('2016', 10),
new OrdinalSales('2017', 20),
];
final mobileSalesData = [
new OrdinalSales('2014', 10),
new OrdinalSales('2015', 15),
new OrdinalSales('2016', 50),
new OrdinalSales('2017', 45),
];
final otherSalesData = [
new OrdinalSales('2014', 20),
new OrdinalSales('2015', 35),
new OrdinalSales('2016', 15),
new OrdinalSales('2017', 10),
];
return [
new charts.Series<OrdinalSales, String>(
id: 'Desktop',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: desktopSalesData,
),
new charts.Series<OrdinalSales, String>(
id: 'Tablet',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: tabletSalesData,
),
new charts.Series<OrdinalSales, String>(
id: 'Mobile',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: mobileSalesData,
),
new charts.Series<OrdinalSales, String>(
id: 'Other',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: otherSalesData,
),
];
}
}
/// Sample ordinal data type.
class OrdinalSales {
final String year;
final int sales;
OrdinalSales(this.year, this.sales);
}