tablex

A production-grade Flutter data grid — zero dependency on any third-party grid engine.

---

Why tablex?

Flutter ships no production-ready data grid. Building one yourself means solving the same problems every time. tablex solves them once:

Infinite scroll eats memory. tablex's infinite mode keeps only a configurable window of pages in memory. Old pages are evicted as new ones arrive and the scroll position is compensated so the viewport never jumps. Data races from concurrent in-flight fetches are eliminated with a generation counter — stale responses are dropped silently.

Every pixel is yours to own — or leave alone. tablex inherits Material 3 ColorScheme by default, so it looks right in any app without a single line of theme config. When you do need to customize, TablexThemeData lets you override exactly what you want — border radius, row colours, checkbox style, density, cell borders, pagination background — without touching what you don't. Wrap a subtree with TablexTheme to scope a theme to a single screen. Every major UI surface has an escape hatch: replace the filter bar with filterBarBuilder, the pagination footer with footerBuilder, the selection summary with selectionSummaryBuilder, and individual cells with cellRenderer. You can swap any one piece without re-implementing the rest.

Server pagination is hard to get right. Page caching, cache invalidation when sort or filters change, deduplication of in-flight requests, back-navigation without re-fetching — tablex handles all of it. You write one fetchTask callback that receives the current query state and returns a page of rows. The library does the rest.

Cursor-based APIs (GraphQL Relay, DynamoDB, Firestore, etc.) are harder still. Opaque tokens can't be computed from a page number — the footer has to remember every token it has seen. tablex maintains a cursor history automatically. Return nextCursor from your fetch and the footer switches to cursor mode transparently: the page indicator updates on every navigation tap and back-navigation reuses cached tokens without a round trip.

Export is always an afterthought — until it isn't. tablex ships a toolbar that exports to CSV, Excel, and PDF out of the box. Export the full dataset or only the selected rows. CSV output is formula-injection safe. PDF auto-detects RTL text (Arabic, Hebrew, etc.) and switches text direction per cell — no flag required. Supply a bundled TTF or use Google Fonts; both paths work.

Filter UI is boilerplate that never ends. Return TablexResponseMeta.filters from your fetch function and tablex renders interactive filter chips above the grid automatically. Each chip opens a checkbox or radio dialog; the selected values flow back into query.params and trigger a re-fetch. Replace the chip UI entirely with filterBarBuilder to render your own inline controls — no subclassing required.

Inline editing in a grid is surprisingly complex. Double-tap any cell to edit it. Tab / Shift+Tab moves between editable columns; ↓ / ↑ moves between rows. Replace the default TextField with any widget — dropdown, date picker, colour swatch — via editRenderer. Confirm with Enter, cancel with Escape. onEdit fires with the typed domain object so you can apply an optimistic update without touching the row key.

---

Screenshots

iOS	macOS

---

What's included

Capability	Detail
Grid modes	static, lazy-paged, infinite scroll, select-picker
Pagination	offset-based and cursor-based (opaque tokens), 10-page cache, page-jump indicator
Sorting	server-side or client-side, multi-column ready
Filter bar	server-driven chips, single-select (radio) and multi-select (checkbox), custom override
Cell renderers	identifier, two-line, avatar + two-line, currency, date, status chip, action buttons
Inline editing	per-cell double-tap, keyboard nav, custom edit widget
Export	CSV (injection-safe), Excel (.xlsx), PDF (landscape, RTL auto-detect)
Import	CSV and Excel via toolbar
Selection	single / multiple with summary bar, bulk actions, selected-only export
Column management	resize, reorder, show/hide, groups, frozen columns
Skeleton loading	placeholder rows during first fetch
Theming & customisation	inherit Material 3 by default; override any surface via TablexThemeData; swap filter bar, footer, summary bar, or any cell renderer independently
i18n	slang-based locale strings, fully overridable

---

Getting started

dependencies:
  tablex: ^0.7.4

---

Usage

TablexConsumer — recommended for server-paginated data

TablexConsumer is the highest-level widget. It wraps Tablex.lazyPaged and adds a rounded bordered container, an optional title/filter header slot, automatic filter-chip rendering, and a selection summary bar. A TablexController is created and disposed for you unless you supply your own.

TablexConsumer<Employee>(
  columns: [
    TablexColumn<Employee, String>(
      fieldKey: 'name',
      title: 'Name',
      width: 180,
      valueGetter: (e) => e.name,
    ),
    TablexColumn<Employee, double>(
      fieldKey: 'salary',
      title: 'Salary',
      width: 130,
      textAlign: TextAlign.end,
      valueGetter: (e) => e.salary,
      cellRenderer: TablexRenderers.currency(symbol: '\$'),
    ),
  ],
  fetchTask: (query) async {
    final resp = await api.getEmployees(
      page: query.page,
      pageSize: query.pageSize,
      sort: query.sort?.field,
      sortAsc: query.sort?.direction == TablexSortDirection.ascending,
    );
    return TablexFetchResult(rows: resp.items, totalRows: resp.total);
  },
  initialPageSize: 13,
  tableHeader: const Text('Employees', style: TextStyle(fontWeight: FontWeight.bold)),
)

Optional header & filter slots

TablexConsumer<Employee>(
  // ...
  tableHeader: Row(
    children: [
      const Text('Employees'),
      const Spacer(),
      TablexToolbar<Employee>(controller: _controller, columns: _columns),
    ],
  ),
  tableFilter: MySearchField(onChanged: (v) => _controller.setParam('q', v)),
)

Skeleton loading

Pre-populate with placeholder rows until the first real page arrives:

TablexConsumer<Employee>(
  // ...
  loadingBuilder: TablexLoadingBuilder(
    skeletonData: List.generate(13, (_) => Employee.placeholder()),
    builder: (context, table) => Skeletonizer(enabled: true, child: table),
  ),
)

Custom pagination footer

TablexConsumer<Employee>(
  // ...
  enablePageJump: true, // editable page-number field
  footerBuilder: (context, info) => Row(
    children: [
      Text('Page ${info.page} of ${info.totalPages}'),
      IconButton(
        icon: const Icon(Icons.chevron_right),
        onPressed: info.nextPage,
      ),
    ],
  ),
)

---

Tablex.static — in-memory grid

All rows are provided upfront. Sorting is handled client-side.

Tablex<Employee>.static(
  columns: columns,
  rows: employees,
  rowBuilder: (e) => TablexRow(
    data: e,
    key: e.id.toString(),
    cells: {'name': e.name, 'salary': e.salary},
  ),
)

---

Tablex.lazyPaged — server-side pagination

Fetches one page at a time. The built-in pagination footer handles page navigation, page-size selection, and a page cache (up to 10 pages cached to avoid re-fetching on back-navigation).

Tablex<Employee>.lazyPaged(
  columns: columns,
  fetchTask: (query) async {
    final result = await api.fetchPage(
      page: query.page,
      pageSize: query.pageSize,
      sortField: query.sort?.field,
      sortAsc: query.sort?.direction == TablexSortDirection.ascending,
    );
    return TablexFetchResult(rows: result.items, totalRows: result.total);
  },
  rowBuilder: rowBuilder,
  initialPageSize: 20,
)

---

Tablex.infinite — infinite scroll with sliding window

New pages are fetched automatically as the user scrolls toward the bottom. A configurable sliding window (windowPages) keeps only that many pages in memory at once — old pages are evicted as new ones arrive, and the scroll position is compensated so the viewport never jumps.

Tablex<Employee>.infinite(
  columns: columns,
  fetchTask: (query) async {
    final result = await api.fetchPage(
      page: query.page,
      pageSize: query.pageSize,
    );
    return TablexFetchResult(rows: result.items, totalRows: result.total);
  },
  rowBuilder: rowBuilder,
  fetchSize: 50,
  windowPages: 5,        // keep at most 5 pages in memory
  loadingBuilder: TablexLoadingBuilder(
    skeletonData: List.generate(15, (_) => Employee.placeholder()),
    builder: (context, table) => Skeletonizer(enabled: true, child: table),
  ),
)

Sorting resets the scroll position, clears all loaded pages, and re-fetches from page 1 — stale in-flight requests are discarded via a generation counter so no data races occur.

---

Tablex.select — picker / combobox

Turns the grid into a single or multi-select picker. Density defaults to compact.

Tablex<Country>.select(
  columns: countryColumns,
  rows: countries,
  rowBuilder: countryRowBuilder,
  multiSelect: true,
  onSelectionChanged: (selected) => setState(() => _picked = selected),
)

---

TablexController

The controller is optional — each widget creates its own unless you pass one. Provide your own when you need to drive the grid from outside.

final _controller = TablexController<Employee>();

// Refresh (re-fetches current page, invalidates the page cache)
_controller.refresh();

// Pass arbitrary params to fetchTask
_controller.setParam('status', 'active');

// Programmatic navigation
_controller.goToPage(3);
_controller.nextPage();
_controller.previousPage();

// Sort
_controller.setSort(const TablexColumnSort(
  field: 'name',
  direction: TablexSortDirection.ascending,
));

// Row manipulation (useful for optimistic updates)
_controller.updateRow(0, updatedEmployee, rowBuilder: rowBuilder);
_controller.removeRow(0);

// Export — all rows
final csv   = _controller.exportToCsv(columns);
final xlsx  = _controller.exportToExcel(columns);
final pdf   = await _controller.exportToPdf(columns);   // async

// Export — selected rows only
final csv2  = _controller.exportSelectedToCsv(columns);
final xlsx2 = _controller.exportSelectedToExcel(columns);
final pdf2  = await _controller.exportSelectedToPdf(columns);

// Selection
_controller.selectAll(_controller.getAllRowData());
_controller.clearSelection();

Do not forget to dispose the controller when you own it:

@override
void dispose() {
  _controller.dispose();
  super.dispose();
}

---

Column definitions

TablexColumn

TablexColumn<Employee, String>(
  fieldKey: 'name',   // must match the key in TablexRow.cells
  title: 'Name',
  width: 180,
  minWidth: 80,
  enableSorting: true,
  enableFiltering: true,
  textAlign: TextAlign.start,
  cellRenderer: TablexRenderers.twoLine(secondLine: (e) => e.email),

  // Hide this column when every loaded row has a null/empty value for it.
  hideIfEmpty: true,

  // Override the string written to CSV / Excel / PDF for this column.
  // Receives the full typed row so you can derive the value from any field.
  exportFormatter: (employee) => '${employee.firstName} ${employee.lastName}',

  // Enable double-tap-to-edit for this column.
  enableEditing: true,
)

Column groups

Span a header label across multiple columns:

Tablex<Employee>.lazyPaged(
  columns: columns,
  columnGroups: [
    TablexColumnGroup(
      title: 'Personal',
      fieldKeys: ['firstName', 'lastName', 'email'],
    ),
    TablexColumnGroup(
      title: 'Compensation',
      fieldKeys: ['salary', 'bonus'],
    ),
  ],
  // ...
)

---

Built-in renderers

Renderer	Description
TablexRenderers.identifier()	Monospaced ID / UUID chip
TablexRenderers.twoLine(secondLine: ...)	Primary text + dimmed secondary line
TablexRenderers.avatarTwoLine(avatar: ..., secondLine: ...)	Circular avatar + two lines
TablexRenderers.currency(symbol: '\$', decimals: 2)	Right-aligned number with currency symbol
TablexRenderers.date(format: ...)	Formatted DateTime
TablexRenderers.statusChip(colors: ..., labels: ...)	Rounded coloured chip
TablexRenderers.actions(actions: ...)	Row of icon buttons

---

Inline cell editing

Set enableEditing: true on any column to allow in-place editing. Double-tap a cell (or call _controller.beginEdit(rowIndex, fieldKey)) to enter edit mode.

TablexColumn<Employee, String>(
  fieldKey: 'name',
  title: 'Name',
  enableEditing: true,
)

Keyboard navigation

Key	Action
Tab / Shift+Tab	Move to next / previous editable column
↓ / ↑	Move to same column in the row below / above
Enter	Confirm and exit edit mode
Escape	Cancel — restores the original value

Custom edit cell

Supply buildEditCell to replace the default TextField with any widget (dropdown, date picker, etc.):

TablexColumn<Employee, String>(
  fieldKey: 'department',
  title: 'Department',
  enableEditing: true,
  buildEditCell: (context, row, value, onSubmit, onCancel) => DropdownButton<String>(
    value: value as String?,
    items: departments.map((d) => DropdownMenuItem(value: d, child: Text(d))).toList(),
    onChanged: (v) { if (v != null) onSubmit(v); },
  ),
)

Programmatic editing

_controller.beginEdit(rowIndex, 'name');   // enter edit mode
_controller.confirmEdit('New Name');        // save and exit
_controller.cancelEdit();                  // discard and exit

---

Toolbar (export & import)

TablexToolbar gives you column-visibility management, CSV export, Excel export, PDF export, CSV import, and Excel import as a single drop-in widget.

When rows are selected the export buttons automatically switch to selected-only mode — the tooltip updates to show the count (e.g. 'Export PDF (3 selected)').

TablexConsumer<Employee>(
  tableHeader: TablexToolbar<Employee>(
    controller: _controller,
    columns: _columns,
    // Enable import by providing a factory that parses one CSV/Excel row
    importRowFactory: (map) => TablexRow(
      data: Employee.fromMap(map),
      key: map['id'],
      cells: {'name': map['name']!, 'salary': double.parse(map['salary']!)},
    ),
  ),
  // ...
)

Override individual actions while keeping the rest:

TablexToolbar<Employee>(
  controller: _controller,
  columns: _columns,
  onExportCsv:   (csv)   async => await api.uploadCsv(csv),
  onExportExcel: (bytes) async => await FileSaver.saveFile('report.xlsx', bytes),
  onExportPdf:   (bytes) async => await FileSaver.saveFile('report.pdf', bytes),
)

PDF export

exportToPdf and exportSelectedToPdf generate a styled .pdf byte array. The page switches automatically to landscape when there are more than six visible columns; number and currency columns are right-aligned.

// Via the controller directly
final bytes = await _controller.exportToPdf(columns);
await FileSaver.saveFile('report.pdf', bytes);

// Selected rows only
final bytes = await _controller.exportSelectedToPdf(columns);

Non-Latin fonts & RTL (Arabic, Hebrew, CJK, …)

The default PDF fonts only cover Latin characters. Supply a font via TablexPdfConfig and set it once on the controller — toolbar buttons and direct calls all pick it up automatically.

RTL direction is detected automatically from cell content. No flag is needed.

// Option A — bundled asset (works offline, no extra package):
controller.pdfConfig = TablexPdfConfig(
  fontData:     await rootBundle.load('assets/fonts/Cairo-Regular.ttf'),
  fontBoldData: await rootBundle.load('assets/fonts/Cairo-Bold.ttf'),
);

// Option B — Google Fonts at runtime (requires the `printing` package):
controller.pdfConfig = TablexPdfConfig(
  font:     await PdfGoogleFonts.cairoRegular(),
  fontBold: await PdfGoogleFonts.cairoBold(),
);

---

Filter bar

TablexConsumer automatically renders an interactive filter bar above the grid whenever your fetchTask returns filters in its response metadata. No extra widget needed — just populate TablexResponseMeta.filters and the chips appear.

Future<TablexFetchResult<Employee>> _fetch(TablexQuery query) async {
  final data = await api.getEmployees(
    page: query.page,
    department: query.params['department'],   // read active filter value
    status: query.params['status'],
  );

  return TablexFetchResult(
    rows: data.items,
    totalRows: data.total,
    meta: TablexResponseMeta(
      filters: [
        TablexActiveFilter(
          key: 'department',
          label: 'Department',
          values: [
            TablexActiveFilterValue(value: 'engineering', label: 'Engineering'),
            TablexActiveFilterValue(value: 'design',      label: 'Design'),
            TablexActiveFilterValue(value: 'marketing',   label: 'Marketing'),
          ],
        ),
        TablexActiveFilter(
          key: 'status',
          label: 'Status',
          singleSelect: true,   // radio buttons instead of checkboxes
          values: [
            TablexActiveFilterValue(value: 'active',   label: 'Active'),
            TablexActiveFilterValue(value: 'inactive', label: 'Inactive'),
          ],
        ),
      ],
    ),
  );
}

Each filter becomes a FilterChip. Tapping it opens a dialog with checkboxes (default) or radio buttons (singleSelect: true). The selected values are written to query.params[key] as a comma-separated string, which your fetchTask can read back. An × on the chip clears that filter; a Clear all button resets every active filter at once.

Custom filter bar override

Replace the default chip-dialog bar with any widget using filterBarBuilder. The callback receives the active filters, the controller (to read/write query.params), and the BuildContext. It is called only when filters are non-empty.

TablexConsumer<Employee>(
  // ...
  filterBarBuilder: (context, filters, controller) {
    // Read currently-selected departments from query params
    final active = (controller.query.params['department'] as String? ?? '')
        .split(',')
        .where((s) => s.isNotEmpty)
        .toSet();

    return SingleChildScrollView(
      scrollDirection: Axis.horizontal,
      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
      child: Row(
        children: filters.first.values.map((v) {
          final selected = active.contains(v.value);
          return Padding(
            padding: const EdgeInsets.only(right: 6),
            child: FilterChip(
              label: Text(v.label),
              selected: selected,
              showCheckmark: false,
              onSelected: (_) {
                final next = Set<String>.from(active);
                selected ? next.remove(v.value) : next.add(v.value);
                controller.setParam('department', next.join(','));
              },
            ),
          );
        }).toList(),
      ),
    );
  },
)

Return SizedBox.shrink() from filterBarBuilder to hide the filter bar entirely while keeping the fetch metadata wired up.

---

Row selection & bulk actions

Tablex<Employee>.static(
  // ...
  selectionMode: TablexSelectionMode.multiple,
  showSelectionSummary: true,
  selectionActions: [
    TablexSelectionAction<Employee>(
      label: 'Delete selected',
      icon: Icons.delete_outline,
      onPressed: (selected) => _bulkDelete(selected),
    ),
  ],
)

When showSelectionSummary is true, the summary bar automatically shows CSV, Excel, and PDF export buttons for the selected rows. Override any of them to plug in your own handler:

Tablex<Employee>.static(
  // ...
  showSelectionSummary: true,
  onExportSelectedCsv:   (csv)   async => await api.uploadCsv(csv),
  onExportSelectedExcel: (bytes) async => await FileSaver.saveFile('selected.xlsx', bytes),
  onExportSelectedPdf:   (bytes) async => await FileSaver.saveFile('selected.pdf', bytes),
)

Replace the entire summary bar with a custom widget:

selectionSummaryBuilder: (context, selected, clearSelection) => ColoredBox(
  color: Theme.of(context).colorScheme.primaryContainer,
  child: Row(children: [
    Text('${selected.length} selected'),
    const Spacer(),
    TextButton(onPressed: clearSelection, child: const Text('Clear')),
  ]),
),

---

Theming

All colours fall back to the ambient Material 3 ColorScheme when not set. Override only what you need:

Tablex<Employee>.static(
  theme: const TablexThemeData(
    showVerticalCellBorders: false,
    borderRadius: BorderRadius.all(Radius.circular(12)),
    checkboxTheme: TablexCheckboxTheme(
      activeColor: Colors.indigo,
      checkColor: Colors.white,
      size: 18,
    ),
  ),
  // ...
)

Alternatively, wrap your subtree with TablexTheme to apply a theme to all grids in scope:

TablexTheme(
  data: const TablexThemeData(showVerticalCellBorders: true),
  child: MyScreen(),
)

Selectable cell text

On web, cell text is rendered with SelectableText by default so users can copy values by dragging. Disable it or opt in on desktop:

TablexThemeData(
  enableTextSelection: false,  // disable on web
  // enableTextSelection: true, // opt in on desktop
)

Custom renderers can read ctx.enableTextSelection to follow the same setting:

cellRenderer: (row, value, ctx) => ctx.enableTextSelection
    ? SelectableText(value, maxLines: 1)
    : Text(value, overflow: TextOverflow.ellipsis),

Empty cell placeholder

Set a grid-wide placeholder for null cells without touching every column:

TablexThemeData(emptyCellPlaceholder: 'N/A')

Column-level TablexColumnBase.emptyCellPlaceholder takes precedence when set. The fallback chain is: column → theme → '—' (when showEmptyAsDash) → blank.

Selection summary bar colour

TablexThemeData(selectionSummaryBarColor: Colors.indigo.shade50)

---

Additional information

• Source & issues
• PRs and bug reports are welcome.