KonectarApp/lib/widgets/piechart.dart

import 'package:fl_chart/fl_chart.dart';

import 'package:flutter/material.dart';
import 'package:konectar_events/utils/appcolors.dart';
import 'package:konectar_events/widgets/indicators.dart';

class CustomPieChart extends StatefulWidget {
  const CustomPieChart({super.key});

  @override
  State<StatefulWidget> createState() => CustomPieChartState();
}

class CustomPieChartState extends State {
  int touchedIndex = -1;

  @override
  Widget build(BuildContext context) {
    return AspectRatio(
      aspectRatio: 1.3,
      child: Column(
        children: <Widget>[
          const SizedBox(
            height: 18,
          ),
          Expanded(
            child: AspectRatio(
              aspectRatio: 1.9,
              child: PieChart(
                PieChartData(
                  pieTouchData: PieTouchData(
                    touchCallback: (FlTouchEvent event, pieTouchResponse) {
                      setState(() {
                        if (!event.isInterestedForInteractions ||
                            pieTouchResponse == null ||
                            pieTouchResponse.touchedSection == null) {
                          touchedIndex = -1;
                          return;
                        }
                        touchedIndex = pieTouchResponse
                            .touchedSection!.touchedSectionIndex;
                      });
                    },
                  ),
                  borderData: FlBorderData(
                    show: false,
                  ),
                  sectionsSpace: 0,
                  centerSpaceRadius: 60,
                  sections: showingSections(),
                ),
              ),
            ),
          ),
          SizedBox(
            height: 5,
          ),
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: const Column(
              mainAxisAlignment: MainAxisAlignment.end,
              crossAxisAlignment: CrossAxisAlignment.start,
              children: <Widget>[
                Indicator(
                  size: 8,
                  color: AppColors.contentColorBlue,
                  text: 'Medical Oncology',
                  isSquare: true,
                ),
                SizedBox(
                  height: 2,
                ),
                Indicator(
                  size: 8,
                  color: AppColors.contentColorYellow,
                  text: 'Hematology/Oncology',
                  isSquare: true,
                ),
                SizedBox(
                  height: 2,
                ),
                Indicator(
                  size: 8,
                  color: AppColors.contentColorPurple,
                  text: 'Internal Medicine',
                  isSquare: true,
                ),
                SizedBox(
                  height: 2,
                ),
                Indicator(
                  size: 8,
                  color: AppColors.contentColorGreen,
                  text: 'Radiation Oncology',
                  isSquare: true,
                ),
                SizedBox(
                  height: 2,
                ),
                Indicator(
                  size: 8,
                  color: AppColors.contentColorOrange,
                  text: 'Pediatric Hematology/Oncology',
                  isSquare: true,
                ),
                SizedBox(
                  height: 5,
                ),
              ],
            ),
          ),
          const SizedBox(
            width: 9,
          ),
        ],
      ),
    );
  }

  List<PieChartSectionData> showingSections() {
    return List.generate(5, (i) {
      final isTouched = i == touchedIndex;
      final fontSize = isTouched ? 25.0 : 16.0;
      final radius = isTouched ? 60.0 : 50.0;
      const shadows = [Shadow(color: Colors.black, blurRadius: 2)];
      switch (i) {
        case 0:
          return PieChartSectionData(
            color: AppColors.contentColorBlue,
            value: 40,
            title: '40%',
            radius: radius,
            titleStyle: TextStyle(
              fontSize: fontSize,
              fontWeight: FontWeight.bold,
              color: AppColors.mainTextColor1,
              shadows: shadows,
            ),
          );
        case 1:
          return PieChartSectionData(
            color: AppColors.contentColorYellow,
            value: 44,
            title: '44%',
            radius: radius,
            titleStyle: TextStyle(
              fontSize: fontSize,
              fontWeight: FontWeight.bold,
              color: AppColors.mainTextColor1,
              shadows: shadows,
            ),
          );
        case 2:
          return PieChartSectionData(
            color: AppColors.contentColorPurple,
            value: 40.5,
            title: '40.5%',
            radius: radius,
            titleStyle: TextStyle(
              fontSize: fontSize,
              fontWeight: FontWeight.bold,
              color: AppColors.mainTextColor1,
              shadows: shadows,
            ),
          );
        case 3:
          return PieChartSectionData(
            color: AppColors.contentColorGreen,
            value: 8.2,
            title: '8.2%',
            radius: radius,
            titleStyle: TextStyle(
              fontSize: fontSize,
              fontWeight: FontWeight.bold,
              color: AppColors.mainTextColor1,
              shadows: shadows,
            ),
          );
        case 4:
          return PieChartSectionData(
            color: AppColors.contentColorOrange,
            value: 5.2,
            title: '5.2%',
            radius: radius,
            titleStyle: TextStyle(
              fontSize: fontSize,
              fontWeight: FontWeight.bold,
              color: AppColors.mainTextColor1,
              shadows: shadows,
            ),
          );

        default:
          throw Error();
      }
    });
  }
}