fcs/lib/charts/po_balanceby_buyer.dart

import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:provider/provider.dart';
import 'package:fcs/model/chart_model.dart';
import 'package:fcs/fcs/common/theme.dart';
import 'package:fcs/vo/po.dart';
import 'package:fcs/widget/local_text.dart';

class POBalanceChart_ extends StatefulWidget {
  @override
  _POBalanceChartState createState() => _POBalanceChartState();
}

class _POBalanceChartState extends State<POBalanceChart_> {
  static final numberFormatter = new NumberFormat("#,###");
  List<POBuyerData> chartSummary = new List();
  List<charts.Series<POBuyerData, String>> series;

  @override
  void initState() {
    super.initState();
    var chartModel = Provider.of<ChartModel>(context, listen: false);
    if (mounted) {
      load(chartModel);
    }
  }

  Future<void> load(ChartModel chartModel) async {
    var _u = await chartModel.loadPOBalancesForBuyer_();
    if (_u == null) return;
    setState(() {
      this.chartSummary = _u;
    });
  }

  @override
  Widget build(BuildContext context) {
    List<charts.Series<POBuyerData, String>> series = [
      charts.Series(
          id: "Subscribers",
          data: this.chartSummary,
          domainFn: (POBuyerData series, _) => series.status,
          measureFn: (POBuyerData series, _) => series.amount,
          colorFn: (POBuyerData series, _) =>
              charts.ColorUtil.fromDartColor(series.getColor),
          labelAccessorFn: (POBuyerData series, _) =>
              '${numberFormatter.format(series.amount)}'),
    ];

    return Container(
      height: 200,
      child: Column(
        children: <Widget>[
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: <Widget>[
              LocalText(context, 'po.balances',
                  color: primaryColor, fontSize: 16),
              IconButton(
                icon: Icon(
                  Icons.refresh,
                  color: primaryColor,
                ),
                onPressed: () {
                  _load();
                },
              )
            ],
          ),
          Expanded(
            child: charts.BarChart(
              series,
              animate: true,
              vertical: false,
              defaultRenderer: new charts.BarRendererConfig(
                barRendererDecorator: new charts.BarLabelDecorator<String>(
                  labelPosition: charts.BarLabelPosition.auto,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Future<void> _load() async {
    var chartModel = Provider.of<ChartModel>(context);
    var _s = await chartModel.loadPOBalancesForBuyer_();
    if (_s == null) return;
    setState(() {
      this.chartSummary = _s;
    });
  }
}