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samples/web/charts/lib/i18n/rtl_series_legend.dart

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// Copyright 2018 the Charts project authors. Please see the AUTHORS file
// for details.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/// RTL Bar chart example
// EXCLUDE_FROM_GALLERY_DOCS_START
import 'dart:math';
// EXCLUDE_FROM_GALLERY_DOCS_END
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';
class RTLSeriesLegend extends StatelessWidget {
final List<charts.Series<dynamic, String>> seriesList;
final bool? animate;
const RTLSeriesLegend(this.seriesList, {this.animate, Key? key})
: super(key: key);
/// Creates a [BarChart] with sample data and no transition.
factory RTLSeriesLegend.withSampleData() {
return RTLSeriesLegend(
_createSampleData(),
// Disable animations for image tests.
animate: false,
);
}
// EXCLUDE_FROM_GALLERY_DOCS_START
// This section is excluded from being copied to the gallery.
// It is used for creating random series data to demonstrate animation in
// the example app only.
factory RTLSeriesLegend.withRandomData() {
return RTLSeriesLegend(_createRandomData());
}
/// Create random data.
static List<charts.Series<OrdinalSales, String>> _createRandomData() {
final random = Random();
final desktopSalesData = [
OrdinalSales('2014', random.nextInt(100)),
OrdinalSales('2015', random.nextInt(100)),
OrdinalSales('2016', random.nextInt(100)),
OrdinalSales('2017', random.nextInt(100)),
];
final tabletSalesData = [
OrdinalSales('2014', random.nextInt(100)),
OrdinalSales('2015', random.nextInt(100)),
OrdinalSales('2016', random.nextInt(100)),
OrdinalSales('2017', random.nextInt(100)),
];
final mobileSalesData = [
OrdinalSales('2014', random.nextInt(100)),
OrdinalSales('2015', random.nextInt(100)),
OrdinalSales('2016', random.nextInt(100)),
OrdinalSales('2017', random.nextInt(100)),
];
final otherSalesData = [
OrdinalSales('2014', random.nextInt(100)),
OrdinalSales('2015', random.nextInt(100)),
OrdinalSales('2016', random.nextInt(100)),
OrdinalSales('2017', random.nextInt(100)),
];
return [
charts.Series<OrdinalSales, String>(
id: 'Desktop',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: desktopSalesData,
),
charts.Series<OrdinalSales, String>(
id: 'Tablet',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: tabletSalesData,
),
charts.Series<OrdinalSales, String>(
id: 'Mobile',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: mobileSalesData,
),
charts.Series<OrdinalSales, String>(
id: 'Other',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: otherSalesData,
),
];
}
// EXCLUDE_FROM_GALLERY_DOCS_END
@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 Directionality(
textDirection: TextDirection.rtl,
child: charts.BarChart(
seriesList,
animate: animate,
behaviors: [
charts.SeriesLegend(
position: charts.BehaviorPosition.end, desiredMaxRows: 2)
],
));
}
/// Create series list with multiple series
static List<charts.Series<OrdinalSales, String>> _createSampleData() {
final desktopSalesData = [
OrdinalSales('2014', 5),
OrdinalSales('2015', 25),
OrdinalSales('2016', 100),
OrdinalSales('2017', 75),
];
final tabletSalesData = [
OrdinalSales('2014', 25),
OrdinalSales('2015', 50),
OrdinalSales('2016', 10),
OrdinalSales('2017', 20),
];
final mobileSalesData = [
OrdinalSales('2014', 10),
OrdinalSales('2015', 15),
OrdinalSales('2016', 50),
OrdinalSales('2017', 45),
];
final otherSalesData = [
OrdinalSales('2014', 20),
OrdinalSales('2015', 35),
OrdinalSales('2016', 15),
OrdinalSales('2017', 10),
];
return [
charts.Series<OrdinalSales, String>(
id: 'Desktop',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: desktopSalesData,
),
charts.Series<OrdinalSales, String>(
id: 'Tablet',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: tabletSalesData,
),
charts.Series<OrdinalSales, String>(
id: 'Mobile',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: mobileSalesData,
),
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);
}