fcs/lib/charts/quota.dart

/// Simple pie chart example.
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:fcs/vo/buyer.dart';
import 'package:fcs/vo/product.dart';
import 'package:fcs/widget/localization/app_translations.dart';

class QuotaChart extends StatelessWidget {
  static final numberFormatter = new NumberFormat("#,###");

  final List<charts.Series> quotaSeries;
  final String title;

  QuotaChart(this.quotaSeries, this.title);

  factory QuotaChart.dailyQuota(
      BuildContext context, Buyer buyer, List<Product> products) {
    List<Quota> data = [];
    products.sort((p1, p2) => p1.displayOrder.compareTo(p2.displayOrder));
    products.forEach((p) {
      if (buyer.dailyQuotaUsedProducts.containsKey(p.id)) {
        int value = buyer.dailyQuotaUsedProducts[p.id];
        data.add(Quota(p.name, value, p.color));
      }
    });
    data.add(
      new Quota(AppTranslations.of(context).text("chart.remaining"),
          buyer.dailyQuota - buyer.dailyQuotaUsed, Colors.purple.value),
    );

    return new QuotaChart(
        _createData(data),
        AppTranslations.of(context).text("chart.daily.title",
            translationVariables: [numberFormatter.format(buyer.dailyQuota)]));
  }

  factory QuotaChart.maxQuota(
      BuildContext context, Buyer buyer, List<Product> products) {
    List<Quota> data = [];
    products.sort((p1, p2) => p1.displayOrder.compareTo(p2.displayOrder));
    products.forEach((p) {
      if (buyer.maxQuotaUsedProducts.containsKey(p.id)) {
        int value = buyer.maxQuotaUsedProducts[p.id];
        data.add(Quota(p.name, value, p.color));
      }
    });
    data.add(
       new Quota(AppTranslations.of(context).text("chart.remaining"),
          buyer.maxQuota - buyer.maxQuotaUsed, Colors.purple.value),
    );
    return new QuotaChart(
        _createData(data),
        AppTranslations.of(context).text("chart.max.title",
            translationVariables: [numberFormatter.format(buyer.maxQuota)]));
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        Text(title),
        Padding(
          padding: const EdgeInsets.all(8.0),
          child: Container(
            height: 200,
            child: charts.PieChart(
              quotaSeries,
              animate: false,
              behaviors: [
                new charts.DatumLegend(
                  position: charts.BehaviorPosition.end,
                  horizontalFirst: false,
                  cellPadding: new EdgeInsets.only(right: 4.0, bottom: 4.0),
                  entryTextStyle: charts.TextStyleSpec(
                      color: charts.MaterialPalette.purple.shadeDefault,
                      fontFamily: 'Georgia',
                      fontSize: 11),
                )
              ],
              defaultRenderer: new charts.ArcRendererConfig(
                arcWidth: 60,
                arcRendererDecorators: [
                  new charts.ArcLabelDecorator(
                      labelPosition: charts.ArcLabelPosition.auto,
                      labelPadding: 0)
                ],
              ),
            ),
          ),
        ),
      ],
    );
  }

  static List<charts.Series<Quota, String>> _createData(List<Quota> data) {
    return [
      new charts.Series<Quota, String>(
        id: 'Daily Quota',
        domainFn: (Quota quota, _) => "${quota.label}\n",
        measureFn: (Quota quota, _) => quota.quota,
        data: data,
        colorFn: (Quota quota, i) =>
            charts.ColorUtil.fromDartColor(Color(quota.color)),
        labelAccessorFn: (Quota row, _) =>
            '${numberFormatter.format(row.quota)}',
      )
    ];
  }
}

class Quota {
  final String label;
  final int quota;
  final int color;

  Quota(this.label, this.quota, this.color);
}