flutter DataTable数据表格

数据表显示原始数据集。它们通常出现在桌面企业产品中。DataTable Widget实现这个组件

文档：https://api.flutter.dev/flutter/material/DataTable-class.html

import 'package:flutter/material.dart';
import './model/post.dart';

class DataTableDemo extends StatefulWidget {
  @override
  _DataTableDemoState createState() => _DataTableDemoState();
}

class _DataTableDemoState extends State<DataTableDemo> {
  int _sortColumnIndex;
  bool _sortAscending = true;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('DataTableDemo'),
        elevation: 0.0,
      ),
      body: Container(
        padding: EdgeInsets.all(16.0),
        child: ListView(
          children: <Widget>[
            DataTable(
              sortColumnIndex: _sortColumnIndex,
              sortAscending: _sortAscending,
              // onSelectAll: (bool value) {},
              columns: [
                DataColumn(
                  label: Text('Title'),
                  onSort: (int index, bool ascending) {
                    setState(() {
                      _sortColumnIndex = index;
                      _sortAscending = ascending;

                      posts.sort((a, b) {
                        if (!ascending) {
                          final c = a;
                          a = b;
                          b = c;
                        }

                        return a.title.length.compareTo(b.title.length);
                      });
                    });
                  },
                ),
                DataColumn(
                  label: Text('Author'),
                ),
                DataColumn(
                  label: Text('Image'),
                ),

              ],
              rows: posts.map((post) {
                return DataRow(
                  selected: post.selected,
                  onSelectChanged: (bool value) {
                    setState(() {
                      if (post.selected != value) {
                        post.selected = value;
                      }
                    });
                  },
                  cells: [
                    DataCell(Text(post.title)),
                    DataCell(Text(post.author)),
                    DataCell(Image.network(post.imageUrl)),

                  ]
                );
              }).toList(),
            ),
          ],
        ),
      )
    );
  }
}

效果：

---

分页demo

import 'package:flutter/material.dart';
import './model/post.dart';

class PostDataSource extends DataTableSource {
  final List<Post> _posts = posts;
  int _selectedCount = 0;

  @override
  int get rowCount => _posts.length;

  @override
  bool get isRowCountApproximate => false;

  @override
  int get selectedRowCount => _selectedCount;

  @override
  DataRow getRow(int index) {
    final Post post = _posts[index];

    return DataRow.byIndex(
      index: index,
      cells: <DataCell>[
        DataCell(Text(post.title)),
        DataCell(Text(post.author)),
        DataCell(Image.network(post.imageUrl)),
      ],
    );
  }

  void _sort(getField(post), bool ascending) {
    _posts.sort((a, b) {
      if (!ascending) {
        final c = a;
        a = b;
        b = c;
      }

      final aValue = getField(a);
      final bValue = getField(b);

      return Comparable.compare(aValue, bValue);
    });

    notifyListeners();
  }
}

class PaginatedDataTableDemo extends StatefulWidget {
  @override
  _PaginatedDataTableDemoState createState() => _PaginatedDataTableDemoState();
}

class _PaginatedDataTableDemoState extends State<PaginatedDataTableDemo> {
  int _sortColumnIndex;
  bool _sortAscending = true;

  final PostDataSource _postsDataSource = PostDataSource();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('PaginatedDataTableDemo'),
          elevation: 0.0,
        ),
        body: Container(
          padding: EdgeInsets.all(16.0),
          child: ListView(
            children: <Widget>[
              PaginatedDataTable(
                header: Text('Posts'),
                rowsPerPage: 5,
                source: _postsDataSource,
                sortColumnIndex: _sortColumnIndex,
                sortAscending: _sortAscending,
                // onSelectAll: (bool value) {},
                columns: [
                  DataColumn(
                    label: Text('Title'),
                    onSort: (int columnIndex, bool ascending) {
                      _postsDataSource._sort((post) => post.title.length, ascending);

                      setState(() {
                        _sortColumnIndex = columnIndex;
                        _sortAscending = ascending;
                      });
                    },
                  ),
                  DataColumn(
                    label: Text('Author'),
                  ),
                  DataColumn(
                    label: Text('Image'),
                  ),
                ],
              ),
            ],
          ),
        ));
  }
}

效果：