using System.Collections.Generic; using System.Linq; using Unity.UIWidgets.external; using Unity.UIWidgets.foundation; using Unity.UIWidgets.gestures; using Unity.UIWidgets.material; using Unity.UIWidgets.painting; using Unity.UIWidgets.rendering; using Unity.UIWidgets.ui; using Unity.UIWidgets.widgets; using UnityEngine; using TextStyle = Unity.UIWidgets.painting.TextStyle; namespace Unity.UIWidgets.material { public class PaginatedDataTable : StatefulWidget { public PaginatedDataTable( Key key = null, Widget header = null, List actions = null, List columns = null, int? sortColumnIndex = null, bool sortAscending = false, ValueSetter onSelectAll = null, float dataRowHeight = material_.kMinInteractiveDimension, float headingRowHeight = 56.0f, float horizontalMargin = 24.0f, float columnSpacing = 56.0f, bool showCheckboxColumn = true, int? initialFirstRowIndex = 0, ValueChanged onPageChanged = null, int rowsPerPage = defaultRowsPerPage, List availableRowsPerPage = null, ValueChanged onRowsPerPageChanged = null, DragStartBehavior dragStartBehavior = DragStartBehavior.start, DataTableSource source = null ) : base(key: key) { availableRowsPerPage = availableRowsPerPage ?? new List { defaultRowsPerPage, defaultRowsPerPage * 2, defaultRowsPerPage * 5, defaultRowsPerPage * 10 }; D.assert(columns.isNotEmpty); D.assert(() => { if (onRowsPerPageChanged != null) D.assert(availableRowsPerPage != null && availableRowsPerPage.Contains(rowsPerPage)); return true; }); D.assert(source != null); this.header = header; this.actions = actions; this.columns = columns; this.sortColumnIndex = sortColumnIndex; this.sortAscending = sortAscending; this.onSelectAll = onSelectAll; this.dataRowHeight = dataRowHeight; this.headingRowHeight = headingRowHeight; this.horizontalMargin = horizontalMargin; this.columnSpacing = columnSpacing; this.showCheckboxColumn = showCheckboxColumn; this.initialFirstRowIndex = initialFirstRowIndex; this.onPageChanged = onPageChanged; this.rowsPerPage = rowsPerPage; this.availableRowsPerPage = availableRowsPerPage; this.onRowsPerPageChanged = onRowsPerPageChanged; this.dragStartBehavior = dragStartBehavior; this.source = source; } public readonly Widget header; public readonly List actions; public readonly List columns; public readonly int? sortColumnIndex; public readonly bool sortAscending; public readonly ValueSetter onSelectAll; public readonly float dataRowHeight; public readonly float headingRowHeight; public readonly float horizontalMargin; public readonly float columnSpacing; public readonly bool showCheckboxColumn; public readonly int? initialFirstRowIndex; public readonly ValueChanged onPageChanged; public readonly int rowsPerPage; public const int defaultRowsPerPage = 10; public readonly List availableRowsPerPage; public readonly ValueChanged onRowsPerPageChanged; public readonly DataTableSource source; public readonly DragStartBehavior dragStartBehavior; public override State createState() => new PaginatedDataTableState(); } class PaginatedDataTableState : State { int _firstRowIndex; int _rowCount; bool _rowCountApproximate; int _selectedRowCount; public readonly Dictionary _rows = new Dictionary(); public override void initState() { base.initState(); _firstRowIndex = (PageStorage.of(context)?.readState(context)) as int? ?? widget.initialFirstRowIndex ?? 0; widget.source.addListener(_handleDataSourceChanged); _handleDataSourceChanged(); } public override void didUpdateWidget(StatefulWidget oldWidget) { base.didUpdateWidget(oldWidget); if (oldWidget is PaginatedDataTable painPaginatedDataTable) { if (painPaginatedDataTable.source != widget.source) { painPaginatedDataTable.source.removeListener(_handleDataSourceChanged); widget.source.addListener(_handleDataSourceChanged); _handleDataSourceChanged(); } } } public override void dispose() { widget.source.removeListener(_handleDataSourceChanged); base.dispose(); } void _handleDataSourceChanged() { setState(() => { _rowCount = widget.source.rowCount; _rowCountApproximate = widget.source.isRowCountApproximate; _selectedRowCount = widget.source.selectedRowCount; _rows.Clear(); }); } void pageTo(int rowIndex) { int oldFirstRowIndex = _firstRowIndex; setState(() => { int rowsPerPage = widget.rowsPerPage; _firstRowIndex = ((int) (1.0f * rowIndex / rowsPerPage)) * rowsPerPage; }); if ((widget.onPageChanged != null) && (oldFirstRowIndex != _firstRowIndex)) widget.onPageChanged(_firstRowIndex); } DataRow _getBlankRowFor(int index) { return DataRow.byIndex( index: index, cells: LinqUtils.SelectList(widget.columns,((DataColumn column) => DataCell.empty)) ); } DataRow _getProgressIndicatorRowFor(int index) { bool haveProgressIndicator = false; List cells = LinqUtils.SelectList(widget.columns,((DataColumn column) => { if (!column.numeric) { haveProgressIndicator = true; return new DataCell(new CircularProgressIndicator()); } return DataCell.empty; })); if (!haveProgressIndicator) { haveProgressIndicator = true; cells[0] = new DataCell(new CircularProgressIndicator()); } return DataRow.byIndex( index: index, cells: cells ); } List _getRows(int firstRowIndex, int rowsPerPage) { List result = new List(); int nextPageFirstRowIndex = firstRowIndex + rowsPerPage; bool haveProgressIndicator = false; for (int index = firstRowIndex; index < nextPageFirstRowIndex; index += 1) { DataRow row = null; if (index < _rowCount || _rowCountApproximate) { row = _rows.putIfAbsent(index, () => widget.source.getRow(index)); if (row == null && !haveProgressIndicator) { row = row ?? _getProgressIndicatorRowFor(index); haveProgressIndicator = true; } } row = row ?? _getBlankRowFor(index); result.Add(row); } return result; } void _handlePrevious() { pageTo(Mathf.Max(_firstRowIndex - widget.rowsPerPage, 0)); } void _handleNext() { pageTo(_firstRowIndex + widget.rowsPerPage); } public readonly GlobalKey _tableKey = GlobalKey.key(); public override Widget build(BuildContext context) { D.assert(material_.debugCheckHasMaterialLocalizations(context)); ThemeData themeData = Theme.of(context); MaterialLocalizations localizations = MaterialLocalizations.of(context); List headerWidgets = new List(); float startPadding = 24.0f; if (_selectedRowCount == 0) { headerWidgets.Add(new Expanded(child: widget.header)); if (widget.header is ButtonBar) { startPadding = 12.0f; } } else { headerWidgets.Add(new Expanded( child: new Text(localizations.selectedRowCountTitle(_selectedRowCount)) )); } if (widget.actions != null) { headerWidgets.AddRange( LinqUtils.SelectList(widget.actions, ((Widget action) => { return new Padding( padding: EdgeInsetsDirectional.only( start: 24.0f - 8.0f * 2.0f), child: action ); })) ); } TextStyle footerTextStyle = themeData.textTheme.caption; List footerWidgets = new List(); if (widget.onRowsPerPageChanged != null) { List availableRowsPerPage = LinqUtils.SelectList( LinqUtils.WhereList(widget.availableRowsPerPage, ((int value) => value <= _rowCount || value == widget.rowsPerPage)), (int value) => { return (Widget) new DropdownMenuItem( value: value, child: new Text($"{value}") ); }); footerWidgets.AddRange(new List() { new Container(width: 14.0f), // to match trailing padding in case we overflow and end up scrolling new Text(localizations.rowsPerPageTitle), new ConstrainedBox( constraints: new BoxConstraints(minWidth: 64.0f), // 40.0 for the text, 24.0 for the icon child: new Align( alignment: AlignmentDirectional.centerEnd, child: new DropdownButtonHideUnderline( child: new DropdownButton( items: availableRowsPerPage.Cast>().ToList(), value: widget.rowsPerPage, onChanged: widget.onRowsPerPageChanged, style: footerTextStyle, iconSize: 24.0f ) ) ) ), }); } footerWidgets.AddRange(new List() { new Container(width: 32.0f), new Text( localizations.pageRowsInfoTitle( _firstRowIndex + 1, _firstRowIndex + widget.rowsPerPage, _rowCount, _rowCountApproximate ) ), new Container(width: 32.0f), new IconButton( icon: new Icon(Icons.chevron_left), padding: EdgeInsets.zero, tooltip: localizations.previousPageTooltip, onPressed: _firstRowIndex <= 0 ? (VoidCallback) null : _handlePrevious), new Container(width: 24.0f), new IconButton( icon: new Icon(Icons.chevron_right), padding: EdgeInsets.zero, tooltip: localizations.nextPageTooltip, onPressed: (!_rowCountApproximate && (_firstRowIndex + widget.rowsPerPage >= _rowCount)) ? (VoidCallback) null : _handleNext ), new Container(width: 14.0f), }); return new LayoutBuilder( builder: (BuildContext _context, BoxConstraints constraints) => { return new Card( child: new Column( crossAxisAlignment: CrossAxisAlignment.stretch, children: new List { new DefaultTextStyle( style: _selectedRowCount > 0 ? themeData.textTheme.subtitle1.copyWith(color: themeData.accentColor) : themeData.textTheme.headline6.copyWith(fontWeight: FontWeight.w400), child: IconTheme.merge( data: new IconThemeData( opacity: 0.54f ), child: new Ink( height: 64.0f, color: _selectedRowCount > 0 ? themeData.secondaryHeaderColor : null, child: new Padding( padding: EdgeInsetsDirectional.only( start: startPadding, end: 14.0f), child: new Row( mainAxisAlignment: MainAxisAlignment.end, children: headerWidgets ) ) ) ) ), new SingleChildScrollView( scrollDirection: Axis.horizontal, dragStartBehavior: widget.dragStartBehavior, child: new ConstrainedBox( constraints: new BoxConstraints(minWidth: constraints.minWidth), child: new DataTable( key: _tableKey, columns: widget.columns, sortColumnIndex: widget.sortColumnIndex, sortAscending: widget.sortAscending, onSelectAll: widget.onSelectAll, dataRowHeight: widget.dataRowHeight, headingRowHeight: widget.headingRowHeight, horizontalMargin: widget.horizontalMargin, columnSpacing: widget.columnSpacing, rows: _getRows(_firstRowIndex, widget.rowsPerPage) ) ) ), new DefaultTextStyle( style: footerTextStyle, child: IconTheme.merge( data: new IconThemeData( opacity: 0.54f ), child: new Container( height: 56.0f, child: new SingleChildScrollView( dragStartBehavior: widget.dragStartBehavior, scrollDirection: Axis.horizontal, reverse: true, child: new Row( children: footerWidgets ) ) ) ) ) } ) ); } ); } } }