KonectarApp/lib/contacts_module/ui_screen/add_event/add_hcp.dart

import 'package:flutter/material.dart';

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

  @override
  State<Addhcp> createState() => _AddhcpState();
}

class _AddhcpState extends State<Addhcp> {
  late _DataSource _dataSource; // Instance variable for _DataSource

  @override
  void initState() {
    super.initState();
    print("hii_initState");
    _dataSource = _DataSource(context); // Initialize _DataSource
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ListView(
        padding: const EdgeInsets.all(3),
        children: [
          PaginatedDataTable(
            header: const Text(
              'HCP RANKING',
              style: TextStyle(
                  fontWeight: FontWeight.bold,
                  fontSize: 18.0,
                  fontStyle: FontStyle.normal),
            ),
            showFirstLastButtons: true,
            showEmptyRows: false,
            showCheckboxColumn: true,
            rowsPerPage: 5,
            columns: const [
              DataColumn(
                  label: Text('Name',
                      style: TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 14.0,
                          fontStyle: FontStyle.normal))),
              DataColumn(
                  label: Text('Tier',
                      style: TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 14.0,
                          fontStyle: FontStyle.normal))),
              DataColumn(
                  label: Text('Rank',
                      style: TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 14.0,
                          fontStyle: FontStyle.normal))),
              DataColumn(
                  label: Text('Score',
                      style: TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 14.0,
                          fontStyle: FontStyle.normal))),
              DataColumn(
                  label: Text('Event',
                      style: TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 14.0,
                          fontStyle: FontStyle.normal))),
              DataColumn(
                  label: Text('Affliations',
                      style: TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 14.0,
                          fontStyle: FontStyle.normal))),
              DataColumn(
                  label: Text('Publications',
                      style: TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 14.0,
                          fontStyle: FontStyle.normal))),
              DataColumn(
                  label: Text('Trails',
                      style: TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 14.0,
                          fontStyle: FontStyle.normal))),
            ],
            source: _dataSource,
          ),
        ],
      ),
      floatingActionButton: Visibility(
        visible: true,
        child: FloatingActionButton(
          onPressed: () {
            Navigator.pop(context);
          },
          child: Icon(Icons.add),
        ),
      ),
    );
  }
}

class _Row {
  _Row(this.identifier, this.valueA, this.valueC, this.valueD, this.valueE,
      this.valueF, this.valueG, this.valueH, this.valueI);

  final int identifier;
  final String valueA;
  final String valueC;
  final String valueD;
  final String valueE;
  final String valueF;
  final String valueG;
  final String valueH;
  final String valueI;

  bool selected = false;
}

class _DataSource extends DataTableSource {
  final BuildContext context;
  late List<_Row> _rows;
  // late List<int> _selectedRowsIndexes = []; // List to track selected rows
  final List<String> _selectedRowIds = [];

  _DataSource(this.context) {
    _rows = <_Row>[
      for (int i = 0; i < 20; i++)
        _Row(i, 'pooja', 'Tier1', '1', '0', '0', '0', '0', '0'),
    ];
    //}
  }

  List<String> getSelectedRowIds() {
    return _selectedRowIds; // Return a copy to prevent direct modification
  }

  int _selectedCount = 0;

  @override
  DataRow? getRow(int index) {
    assert(index >= 0);
    if (index >= _rows.length) return null;
    final row = _rows[index];
    return DataRow.byIndex(
      index: index,
      selected: row.selected,
      onSelectChanged: (value) {
        if (row.selected != value) {
          //  _selectedCount += value! ? 1 : -1;
          // assert(_selectedCount >= 0);
          row.selected = value!;

          if (value) {
            print("Selected");
            _selectedRowIds.add(row.valueA); // Add the row ID to the list
            print("Selected_selectedRowIds :$_selectedRowIds");
          } else {
            _selectedRowIds
                .remove(row.valueA); // Remove the row ID from the list
          }
          notifyListeners();

          print("Selectedddd_is $value");
          print("Selectedddd_value ${row.valueA}");
        }
      },
      cells: [
        DataCell(
          Text(row.valueA),
          onTap: () {
            print("hiii Data cell tap ${row.valueA}");

            // Navigator.push(
            //     context, MaterialPageRoute(builder: (context) => Profile()));
          },
        ),
        DataCell(Text(row.valueC)),
        DataCell(Text(row.valueD.toString())),
        DataCell(Text(row.valueE)),
        DataCell(Text(row.valueF)),
        DataCell(Text(row.valueG)),
        DataCell(Text(row.valueH)),
        DataCell(Text(row.valueI)),
      ],
    );
  }

  @override
  int get rowCount => _rows.length;

  @override
  bool get isRowCountApproximate => false;

  @override
  int get selectedRowCount => _selectedCount;
}