adding packages
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import 'dart:ui';
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import 'package:flutter/gestures.dart' show DragStartBehavior;
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter/widgets.dart';
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class StatelessDataTable extends StatelessWidget {
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StatelessDataTable({
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Key? key,
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this.header,
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this.actions,
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required this.columns,
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required this.rows,
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this.sortColumnIndex,
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this.showCheckboxColumn = true,
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this.sortAscending = true,
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this.totalItems,
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this.onSelectAll,
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this.firstRowIndex = 0,
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this.onPageChanged,
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this.shrinkWrap = false,
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this.selectedActions,
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this.rowCountApproximate = false,
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this.rowsPerPage = defaultRowsPerPage,
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this.handlePrevious,
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this.handleNext,
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this.availableRowsPerPage = const <int>[defaultRowsPerPage, defaultRowsPerPage * 2, defaultRowsPerPage * 5, defaultRowsPerPage * 10],
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this.onRowsPerPageChanged,
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this.dragStartBehavior = DragStartBehavior.down,
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}) : assert(columns.isNotEmpty),
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assert(sortColumnIndex == null || (sortColumnIndex >= 0 && sortColumnIndex < columns.length)),
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assert(rowsPerPage > 0),
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assert(() {
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if (onRowsPerPageChanged != null) {
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assert(availableRowsPerPage.contains(rowsPerPage));
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}
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return true;
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}()),
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super(key: key);
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final VoidCallback? handleNext, handlePrevious;
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final Widget? header;
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final bool showCheckboxColumn;
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final List<Widget>? actions, selectedActions;
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final List<DataColumn> columns;
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final List<DataRow> rows;
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final bool shrinkWrap;
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final int? sortColumnIndex;
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final int? totalItems;
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final bool sortAscending;
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final ValueSetter<bool?>? onSelectAll;
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final ValueChanged<int?>? onPageChanged;
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final int rowsPerPage;
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static const int defaultRowsPerPage = 10;
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final List<int> availableRowsPerPage;
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final ValueChanged<int?>? onRowsPerPageChanged;
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final DragStartBehavior dragStartBehavior;
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final int firstRowIndex;
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final bool rowCountApproximate;
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final Map<int, DataRow> _rows = <int, DataRow>{};
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DataRow _getBlankRowFor(int index) => DataRow.byIndex(index: index, cells: columns.map<DataCell>((DataColumn column) => DataCell.empty).toList());
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DataRow _getProgressIndicatorRowFor(int index) {
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bool haveProgressIndicator = false;
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final List<DataCell> cells = columns.map<DataCell>((DataColumn column) {
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if (!column.numeric) {
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haveProgressIndicator = true;
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return const DataCell(CircularProgressIndicator());
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}
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return DataCell.empty;
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}).toList();
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if (!haveProgressIndicator) {
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haveProgressIndicator = true;
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cells[0] = const DataCell(CircularProgressIndicator());
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}
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return DataRow.byIndex(index: index, cells: cells);
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}
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List<DataRow> _getRows(int firstRowIndex, int rowsPerPage) {
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final List<DataRow> result = <DataRow>[];
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final int nextPageFirstRowIndex = firstRowIndex + rowsPerPage;
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bool haveProgressIndicator = false;
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for (int index = firstRowIndex; index < nextPageFirstRowIndex; index += 1) {
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DataRow? row;
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if (index < rows.length || rowCountApproximate) {
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try {
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row = _rows.putIfAbsent(index, () => rows[index]);
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} catch (e) {
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print("Row not found => $e");
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}
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if (row == null && !haveProgressIndicator) {
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row ??= _getProgressIndicatorRowFor(index);
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haveProgressIndicator = true;
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}
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row ??= _getBlankRowFor(index);
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result.add(row);
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}
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}
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//show no data
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if (result.isEmpty) {
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var cells = columns.map<DataCell>((DataColumn column) => DataCell.empty).toList();
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cells[cells.length ~/ 2] = const DataCell(Text('no data'));
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result.add(DataRow.byIndex(index: 0, cells: cells));
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}
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return result;
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}
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final GlobalKey _tableKey = GlobalKey();
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int get _selectedRowCount => rows.where((d) => d.selected).toSet().toList().length;
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@override
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Widget build(BuildContext context) {
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assert(debugCheckHasMaterialLocalizations(context));
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final ThemeData themeData = Theme.of(context);
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final MaterialLocalizations localizations = MaterialLocalizations.of(context);
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final List<Widget> headerWidgets = <Widget>[];
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double startPadding = 24;
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if (_selectedRowCount == 0) {
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if (header != null) {
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headerWidgets.add(Expanded(child: header!));
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if (header is ButtonBar) {
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startPadding = 12.0;
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}
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}
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} else {
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headerWidgets.add(Expanded(
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child: Text(localizations.selectedRowCountTitle(_selectedRowCount)),
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));
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}
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if (selectedActions != null && _selectedRowCount != 0) {
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headerWidgets.addAll(selectedActions!.map<Widget>((Widget action) {
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return Padding(
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padding: const EdgeInsetsDirectional.only(start: 24.0 - 8.0 * 2.0),
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child: action,
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);
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}).toList());
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} else if (actions != null) {
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headerWidgets.addAll(actions!.map<Widget>((Widget action) {
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return Padding(
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padding: const EdgeInsetsDirectional.only(start: 24.0 - 8.0 * 2.0),
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child: action,
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);
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}).toList());
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}
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final TextStyle? footerTextStyle = themeData.textTheme.caption;
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final List<Widget> footerWidgets = <Widget>[];
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if (onRowsPerPageChanged != null) {
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final List<Widget> _footerChildren =
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availableRowsPerPage.where((int value) => value <= rows.length || value == rowsPerPage).map<DropdownMenuItem<int>>((int value) {
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return DropdownMenuItem<int>(value: value, child: Text('$value'));
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}).toList();
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footerWidgets.addAll(<Widget>[
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Container(width: 14),
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Text(localizations.rowsPerPageTitle),
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ConstrainedBox(
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constraints: const BoxConstraints(minWidth: 64),
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child: Align(
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alignment: AlignmentDirectional.centerEnd,
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child: DropdownButtonHideUnderline(
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child: DropdownButton<int>(
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items: _footerChildren as List<DropdownMenuItem<int>>?,
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value: rowsPerPage,
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onChanged: onRowsPerPageChanged,
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style: footerTextStyle,
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),
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),
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),
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),
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]);
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}
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footerWidgets.addAll(<Widget>[
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Container(width: 32),
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Text(localizations.pageRowsInfoTitle(firstRowIndex + 1, firstRowIndex + rowsPerPage, totalItems ?? rows.length, rowCountApproximate)),
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Container(width: 32),
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IconButton(
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icon: const Icon(Icons.chevron_left),
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padding: EdgeInsets.zero,
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tooltip: localizations.previousPageTooltip,
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onPressed: firstRowIndex <= 0 ? null : handlePrevious),
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Container(width: 24),
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IconButton(
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icon: const Icon(Icons.chevron_right),
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padding: EdgeInsets.zero,
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tooltip: localizations.nextPageTooltip,
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onPressed: (!rowCountApproximate && (firstRowIndex + rowsPerPage >= (totalItems ?? rows.length))) ? null : handleNext),
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Container(width: 14),
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]);
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if (shrinkWrap) {
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return SafeArea(
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: <Widget>[
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if (showCheckboxColumn)
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Semantics(
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container: true,
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child: DefaultTextStyle(
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style: _selectedRowCount > 0
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? themeData.textTheme.subtitle1!.copyWith(color: themeData.colorScheme.secondary)
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: themeData.textTheme.headline6!.copyWith(fontWeight: FontWeight.w400),
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child: IconTheme.merge(
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data: const IconThemeData(opacity: 0.54),
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child: ButtonTheme(
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child: Ink(
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height: 64,
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color: _selectedRowCount > 0 ? themeData.secondaryHeaderColor : null,
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child: Padding(
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padding: EdgeInsetsDirectional.only(start: startPadding, end: 14),
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child: Row(mainAxisAlignment: MainAxisAlignment.end, children: headerWidgets),
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),
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),
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),
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),
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),
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),
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SingleChildScrollView(
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scrollDirection: Axis.horizontal,
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dragStartBehavior: dragStartBehavior,
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child: Builder(
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builder: (BuildContext context) {
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final rows = _getRows(firstRowIndex, rowsPerPage);
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return DataTable(
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showCheckboxColumn: showCheckboxColumn,
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key: _tableKey,
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columns: columns,
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sortColumnIndex: sortColumnIndex,
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sortAscending: sortAscending,
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onSelectAll: onSelectAll,
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rows: rows,
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);
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},
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),
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),
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DefaultTextStyle(
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style: footerTextStyle!,
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child: IconTheme.merge(
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data: const IconThemeData(opacity: 0.54),
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child: Container(
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height: 56,
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child: SingleChildScrollView(
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dragStartBehavior: dragStartBehavior,
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scrollDirection: Axis.horizontal,
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reverse: true,
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child: Row(
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children: footerWidgets,
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),
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),
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),
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),
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),
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],
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),
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);
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}
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return SafeArea(
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: <Widget>[
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if (showCheckboxColumn)
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Semantics(
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container: true,
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child: DefaultTextStyle(
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style: _selectedRowCount > 0
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? themeData.textTheme.subtitle1!.copyWith(color: themeData.colorScheme.secondary)
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: themeData.textTheme.headline6!.copyWith(fontWeight: FontWeight.w400),
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child: IconTheme.merge(
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data: const IconThemeData(opacity: 0.54),
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child: ButtonTheme(
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child: Ink(
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height: 64,
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color: _selectedRowCount > 0 ? themeData.secondaryHeaderColor : null,
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child: Padding(
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padding: EdgeInsetsDirectional.only(start: startPadding, end: 14),
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child: Row(mainAxisAlignment: MainAxisAlignment.end, children: headerWidgets),
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),
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),
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),
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),
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),
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),
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Expanded(
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flex: 8,
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child: ScrollConfiguration(
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behavior: CustomScrollBehavior(),
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child: SingleChildScrollView(
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scrollDirection: Axis.vertical,
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child: SingleChildScrollView(
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scrollDirection: Axis.horizontal,
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child: DataTable(
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key: _tableKey,
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columns: columns,
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sortColumnIndex: sortColumnIndex,
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sortAscending: sortAscending,
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onSelectAll: onSelectAll,
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rows: _getRows(firstRowIndex, rowsPerPage)),
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),
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),
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),
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),
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DefaultTextStyle(
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style: footerTextStyle!,
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child: IconTheme.merge(
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data: const IconThemeData(opacity: 0.54),
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child: SizedBox(
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height: 56,
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child: SingleChildScrollView(
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dragStartBehavior: dragStartBehavior,
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scrollDirection: Axis.horizontal,
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reverse: true,
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child: Row(
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children: footerWidgets,
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),
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),
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),
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),
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),
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],
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),
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);
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}
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}
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class CustomScrollBehavior extends MaterialScrollBehavior {
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@override
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Set<PointerDeviceKind> get dragDevices => {
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PointerDeviceKind.touch,
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PointerDeviceKind.mouse,
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};
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}
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