charts

Selection Bar Highlight Interactions Example

Example:

import 'dart:math';
// EXCLUDE_FROM_GALLERY_DOCS_END
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';

class SelectionBarHighlight extends StatelessWidget {
  final List<charts.Series> seriesList;
  final bool animate;

  SelectionBarHighlight(this.seriesList, {this.animate});

  /// Creates a [BarChart] with sample data and no transition.
  factory SelectionBarHighlight.withSampleData() {
    return new SelectionBarHighlight(
      _createSampleData(),
      // Disable animations for image tests.
      animate: false,
    );
  }


  @override
  Widget build(BuildContext context) {
    // This is just a simple bar chart with optional property
    // [defaultInteractions] set to true to include the default
    // interactions/behaviors when building the chart.
    // This includes bar highlighting.
    //
    // Note: defaultInteractions defaults to true.
    //
    // [defaultInteractions] can be set to false to avoid the default
    // interactions.
    return new charts.BarChart(
      seriesList,
      animate: animate,
      defaultInteractions: true,
    );
  }

  /// Create one series with sample hard coded data.
  static List<charts.Series<OrdinalSales, String>> _createSampleData() {
    final data = [
      new OrdinalSales('2014', 5),
      new OrdinalSales('2015', 25),
      new OrdinalSales('2016', 100),
      new OrdinalSales('2017', 75),
    ];

    return [
      new charts.Series<OrdinalSales, String>(
        id: 'Sales',
        domainFn: (OrdinalSales sales, _) => sales.year,
        measureFn: (OrdinalSales sales, _) => sales.sales,
        data: data,
      )
    ];
  }
}

/// Sample ordinal data type.
class OrdinalSales {
  final String year;
  final int sales;

  OrdinalSales(this.year, this.sales);
}

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