feat: OneNote-style notebooks, text fonts, and page navigation

Add notebook.json containers with multi-member pages, fix PDF text
editing (size/bold/drag/double-tap), index SidecarText in search, and
share keyboard page shortcuts plus a PDF scrubber.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/editor/canvas/office_document_screen.dart

@@ -12,6 +12,7 @@ import '../../services/office/docx_parser.dart';
 import '../../services/office/office_document.dart';
 import '../../services/office/pptx_parser.dart';
 import '../../theme/app_theme.dart';
+import '../ui/page_nav_shortcuts.dart';
 
 /// Unified native Office viewer + ink annotation (PPTX / DOCX).
 class OfficeDocumentScreen extends StatefulWidget {
@@ -172,39 +173,47 @@ class _OfficeDocumentScreenState extends State<OfficeDocumentScreen> {
       );
     }
 
-    return Scaffold(
-      appBar: AppBar(
-        title: Text(p.basename(widget.filePath)),
-        actions: [
-          IconButton(
-            onPressed: _pageIndex > 0 ? () => _goPage(_pageIndex - 1) : null,
-            icon: const Icon(Icons.chevron_left),
-          ),
-          Center(child: Text('${_pageIndex + 1} / $pageCount')),
-          IconButton(
-            onPressed:
-                _pageIndex < pageCount - 1 ? () => _goPage(_pageIndex + 1) : null,
-            icon: const Icon(Icons.chevron_right),
-          ),
-        ],
-      ),
-      body: InteractiveViewer(
-        transformationController: _transform,
-        minScale: 0.5,
-        maxScale: 4,
-        child: Listener(
-          onPointerDown: _onPointerDown,
-          onPointerMove: _onPointerMove,
-          onPointerUp: _onPointerUp,
-          child: CustomPaint(
-            painter: _OfficePagePainter(
-              pptx: _pptx,
-              docx: _docx,
-              pageIndex: _pageIndex,
-              strokes: _strokes,
-              live: _live,
+    return pageNavShortcuts(
+      onPrevious: _pageIndex > 0 ? () => _goPage(_pageIndex - 1) : null,
+      onNext:
+          _pageIndex < pageCount - 1 ? () => _goPage(_pageIndex + 1) : null,
+      onFirst: pageCount > 0 ? () => _goPage(0) : null,
+      onLast: pageCount > 0 ? () => _goPage(pageCount - 1) : null,
+      child: Scaffold(
+        appBar: AppBar(
+          title: Text(p.basename(widget.filePath)),
+          actions: [
+            IconButton(
+              onPressed: _pageIndex > 0 ? () => _goPage(_pageIndex - 1) : null,
+              icon: const Icon(Icons.chevron_left),
+            ),
+            Center(child: Text('${_pageIndex + 1} / $pageCount')),
+            IconButton(
+              onPressed: _pageIndex < pageCount - 1
+                  ? () => _goPage(_pageIndex + 1)
+                  : null,
+              icon: const Icon(Icons.chevron_right),
+            ),
+          ],
+        ),
+        body: InteractiveViewer(
+          transformationController: _transform,
+          minScale: 0.5,
+          maxScale: 4,
+          child: Listener(
+            onPointerDown: _onPointerDown,
+            onPointerMove: _onPointerMove,
+            onPointerUp: _onPointerUp,
+            child: CustomPaint(
+              painter: _OfficePagePainter(
+                pptx: _pptx,
+                docx: _docx,
+                pageIndex: _pageIndex,
+                strokes: _strokes,
+                live: _live,
+              ),
+              size: _pageSize,
             ),
-            size: _pageSize,
           ),
         ),
       ),

lib/editor/canvas/pen_editor_screen.dart

@@ -33,6 +33,7 @@ import '../../l10n/app_localizations.dart';
 import '../../models/bookmark.dart';
 import '../../models/scratch_link.dart';
 import '../../storage/badnote_sidecar.dart';
+import '../../storage/notebook_manifest.dart' show kAnnotationFontFamily;
 import '../engine/brush.dart';
 import '../engine/shape_geometry.dart';
 import '../engine/stroke_eraser.dart';
@@ -47,6 +48,7 @@ import '../input/pressure_curve.dart'
     show PressureCurve, kNaturalPressureFloor;
 import '../pdf/pen_capture_region.dart';
 import '../persistence/sidecar_repository.dart';
+import '../ui/page_nav_shortcuts.dart';
 import '../ui/pen_settings_page.dart';
 import '../ui/thumbnail_grid.dart';
 import 'editor_tool.dart';
@@ -66,6 +68,13 @@ const double _kMarkerSize = 36.0;
 /// page.
 const double _kDefaultTextFontFraction = 0.03;
 
+/// Convert a CSS-like numeric weight (100–900) to a [FontWeight], clamped to
+/// the nearest of the 9 standard weights ([FontWeight.values] is w100..w900).
+FontWeight _fontWeightFromValue(int weight) {
+  final idx = ((weight ~/ 100) - 1).clamp(0, FontWeight.values.length - 1);
+  return FontWeight.values[idx];
+}
+
 class PenEditorScreen extends StatefulWidget {
   const PenEditorScreen({
     super.key,
@@ -98,6 +107,10 @@ class _PenEditorScreenState extends State<PenEditorScreen> {
   /// page pill + thumbnail highlight.
   int _pageIndex = 0;
 
+  /// Live 1-based value while the page pill's scrubber slider is being
+  /// dragged (like the slide editor's scrubber); null when not scrubbing.
+  double? _pageScrub;
+
   /// Strokes per page, keyed by 0-based page index (normalized coords).
   final Map<int, List<PenStroke>> _strokesByPage = {};
 
@@ -1079,6 +1092,7 @@ class _PenEditorScreenState extends State<PenEditorScreen> {
       text: '',
       fontSize: _kDefaultTextFontFraction,
       color: _color.toARGB32(),
+      fontFamily: kAnnotationFontFamily,
     );
     setState(() {
       _textsByPage[pageIndex] = [...?_textsByPage[pageIndex], box];
@@ -1134,6 +1148,55 @@ class _PenEditorScreenState extends State<PenEditorScreen> {
     _bumpOverlay();
   }
 
+  /// TEXT tool drag-to-move: nudge box [id] on [pageIndex] by [deltaPx] (a
+  /// screen-pixel pan delta), converting to a normalized delta via the page's
+  /// on-screen [pageW]/[pageH]. Persists (debounced) like other text edits.
+  void _dragTextBox(
+    int pageIndex,
+    String id,
+    Offset deltaPx,
+    double pageW,
+    double pageH,
+  ) {
+    if (pageW <= 0 || pageH <= 0) return;
+    final list = _textsByPage[pageIndex];
+    if (list == null) return;
+    final idx = list.indexWhere((t) => t.id == id);
+    if (idx == -1) return;
+    final t = list[idx];
+    final nx = (t.nx + deltaPx.dx / pageW).clamp(0.0, 1.0);
+    final ny = (t.ny + deltaPx.dy / pageH).clamp(0.0, 1.0);
+    setState(() {
+      final next = List<SidecarText>.of(list);
+      next[idx] = t.copyWith(nx: nx, ny: ny);
+      _textsByPage[pageIndex] = next;
+    });
+    _scheduleTextsSave(pageIndex);
+    _bumpOverlay();
+  }
+
+  /// Live style edit for the box currently being edited: updates its
+  /// page-relative [fontSize] fraction and/or numeric [fontWeight] via
+  /// copyWith, persisting (debounced) like [_updateEditingText].
+  void _updateEditingStyle({double? fontSize, int? fontWeight}) {
+    final editing = _editingText;
+    if (editing == null) return;
+    final list = _textsByPage[editing.page];
+    if (list == null) return;
+    final idx = list.indexWhere((t) => t.id == editing.id);
+    if (idx == -1) return;
+    setState(() {
+      final next = List<SidecarText>.of(list);
+      next[idx] = next[idx].copyWith(
+        fontSize: fontSize,
+        fontWeight: fontWeight,
+      );
+      _textsByPage[editing.page] = next;
+    });
+    _scheduleTextsSave(editing.page);
+    _bumpOverlay();
+  }
+
   /// Toggle the TEXT tool (drops [_editingText] when leaving, so a half-typed
   /// box gets the empty-on-blur treatment).
   void _toggleTextMode() {
@@ -1529,44 +1592,66 @@ class _PenEditorScreenState extends State<PenEditorScreen> {
   @override
   Widget build(BuildContext context) {
     final l = AppLocalizations.of(context);
+    final formatBar = _buildTextFormatBar();
     return Scaffold(
-      body: Stack(
-        children: [
-          Positioned.fill(child: _buildViewer()),
-          // Floating Material You tool palette (top-center).
-          SafeArea(
-            child: Align(
-              alignment: Alignment.topCenter,
-              child: Padding(
-                padding: const EdgeInsets.only(top: 8),
-                child: _buildToolPalette(),
-              ),
-            ),
-          ),
-          // Floating page-control pill (bottom-center).
-          if (_viewerReady && _pageCount > 0)
+      body: pageNavShortcuts(
+        onPrevious:
+            _pageIndex > 0 ? () => _goToPage(_pageIndex - 1) : null,
+        onNext: _pageIndex < _pageCount - 1
+            ? () => _goToPage(_pageIndex + 1)
+            : null,
+        onFirst: _pageCount > 0 ? () => _goToPage(0) : null,
+        onLast: _pageCount > 0 ? () => _goToPage(_pageCount - 1) : null,
+        child: Stack(
+          children: [
+            Positioned.fill(child: _buildViewer()),
+            // Floating Material You tool palette (top-center).
             SafeArea(
               child: Align(
-                alignment: Alignment.bottomCenter,
+                alignment: Alignment.topCenter,
                 child: Padding(
-                  padding: const EdgeInsets.only(bottom: 16),
-                  child: _buildPagePill(),
+                  padding: const EdgeInsets.only(top: 8),
+                  child: _buildToolPalette(),
                 ),
               ),
             ),
-          // Back button (top-left).
-          SafeArea(
-            child: Padding(
-              padding: const EdgeInsets.all(8),
-              child: RoundIconButton(
-                icon: Icons.arrow_back,
-                tooltip: l.back,
-                onPressed: () => Navigator.of(context).maybePop(),
+            // Compact text-format bar (S/M/L + Bold), shown BELOW the tool
+            // palette while a text box is being edited.
+            if (formatBar != null)
+              SafeArea(
+                child: Align(
+                  alignment: Alignment.topCenter,
+                  child: Padding(
+                    padding: const EdgeInsets.only(top: 68),
+                    child: formatBar,
+                  ),
+                ),
+              ),
+            // Floating page-control pill (bottom-center).
+            if (_viewerReady && _pageCount > 0)
+              SafeArea(
+                child: Align(
+                  alignment: Alignment.bottomCenter,
+                  child: Padding(
+                    padding: const EdgeInsets.only(bottom: 16),
+                    child: _buildPagePill(),
+                  ),
+                ),
+              ),
+            // Back button (top-left).
+            SafeArea(
+              child: Padding(
+                padding: const EdgeInsets.all(8),
+                child: RoundIconButton(
+                  icon: Icons.arrow_back,
+                  tooltip: l.back,
+                  onPressed: () => Navigator.of(context).maybePop(),
+                ),
               ),
             ),
-          ),
-          if (_showPenDebug) _buildDebugReadout(context),
-        ],
+            if (_showPenDebug) _buildDebugReadout(context),
+          ],
+        ),
       ),
     );
   }
@@ -1697,7 +1782,20 @@ class _PenEditorScreenState extends State<PenEditorScreen> {
                     text: t.text,
                     fontSizePx: t.fontSize * pageW,
                     color: Color(t.color),
+                    fontWeight: _fontWeightFromValue(t.fontWeight),
+                    fontFamily: t.fontFamily,
                     onTap: _textMode ? () => _editTextBox(pageIndex, t.id) : null,
+                    // Double-tap always edits, even outside text mode.
+                    onDoubleTap: () => _editTextBox(pageIndex, t.id),
+                    onPanUpdate: _textMode
+                        ? (details) => _dragTextBox(
+                              pageIndex,
+                              t.id,
+                              details.delta,
+                              pageW,
+                              pageH,
+                            )
+                        : null,
                   ),
                 ),
             // Active editing field for a box on this page: a real Flutter
@@ -1714,6 +1812,8 @@ class _PenEditorScreenState extends State<PenEditorScreen> {
                       initialText: t.text,
                       fontSizePx: t.fontSize * pageW,
                       color: Color(t.color),
+                      fontWeight: _fontWeightFromValue(t.fontWeight),
+                      fontFamily: t.fontFamily,
                       hintText: AppLocalizations.of(context).textPlaceholder,
                       onChanged: _updateEditingText,
                       onDone: _finishTextEdit,
@@ -1969,6 +2069,64 @@ class _PenEditorScreenState extends State<PenEditorScreen> {
     );
   }
 
+  /// Compact text-format bar shown (below the tool palette) while a text box
+  /// is being edited: S/M/L font-size presets + a Bold toggle. Edits apply
+  /// live to the editing [SidecarText] via [_updateEditingStyle]. Returns null
+  /// when nothing is being edited (or the box has since been removed).
+  Widget? _buildTextFormatBar() {
+    final editing = _editingText;
+    if (editing == null) return null;
+    final list = _textsByPage[editing.page];
+    if (list == null) return null;
+    final idx = list.indexWhere((t) => t.id == editing.id);
+    if (idx == -1) return null;
+    final current = list[idx];
+    final cs = Theme.of(context).colorScheme;
+    final l = AppLocalizations.of(context);
+    final isBold = current.fontWeight >= 700;
+
+    Widget sizeButton(String label, double fraction) {
+      final selected = (current.fontSize - fraction).abs() < 0.001;
+      return TextButton(
+        style: TextButton.styleFrom(
+          minimumSize: const Size(36, 36),
+          padding: EdgeInsets.zero,
+          backgroundColor:
+              selected ? cs.secondaryContainer : Colors.transparent,
+          foregroundColor:
+              selected ? cs.onSecondaryContainer : cs.onSurfaceVariant,
+        ),
+        onPressed: () => _updateEditingStyle(fontSize: fraction),
+        child: Text(label),
+      );
+    }
+
+    return Material(
+      color: cs.surfaceContainerHigh,
+      elevation: 3,
+      borderRadius: BorderRadius.circular(20),
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 4),
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            sizeButton(l.textFontSmall, 0.022),
+            sizeButton(l.textFontMedium, 0.03),
+            sizeButton(l.textFontLarge, 0.045),
+            PaletteDivider(cs: cs),
+            ToolButton(
+              icon: Icons.format_bold,
+              selected: isBold,
+              tooltip: l.textBold,
+              onPressed: () =>
+                  _updateEditingStyle(fontWeight: isBold ? 400 : 700),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
   Widget _colorDot(Color c, ColorScheme cs) {
     // Selected against the ACTIVE brush's remembered color; a tap updates only
     // that brush's entry (rnote per-brush color memory). Inert in select mode.
@@ -1992,47 +2150,80 @@ class _PenEditorScreenState extends State<PenEditorScreen> {
     );
   }
 
-  /// Floating page control: a COMPACT pill (prev / "n / total" / next).
+  /// Floating page control: a scrubber Slider (multi-page docs) above a
+  /// COMPACT pill (prev / "n / total" / next). Mirrors the slide editor's
+  /// scrubber; the center button now opens the thumbnail grid.
   Widget _buildPagePill() {
     final cs = Theme.of(context).colorScheme;
     final l = AppLocalizations.of(context);
     final total = _pageCount;
-    final shown = _pageIndex + 1;
-    return Material(
-      color: cs.surfaceContainerHigh,
-      elevation: 3,
-      borderRadius: BorderRadius.circular(28),
-      child: Padding(
-        padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
-        child: Row(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            IconButton(
-              tooltip: l.previousPage,
-              icon: const Icon(Icons.chevron_left),
-              onPressed:
-                  _pageIndex > 0 ? () => _goToPage(_pageIndex - 1) : null,
-            ),
-            TextButton(
-              onPressed: null,
-              child: Text(
-                l.pageOfPages(shown, total),
-                style: TextStyle(
-                  color: cs.onSurface,
-                  fontWeight: FontWeight.w600,
+    final scrub = _pageScrub;
+    final shown = (scrub ?? (_pageIndex + 1).toDouble()).round();
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        if (total > 1)
+          Container(
+            margin: const EdgeInsets.only(bottom: 8),
+            constraints: const BoxConstraints(maxWidth: 420),
+            child: Material(
+              color: cs.surfaceContainerHigh,
+              elevation: 3,
+              borderRadius: BorderRadius.circular(28),
+              child: Padding(
+                padding: const EdgeInsets.symmetric(horizontal: 12),
+                child: Slider(
+                  min: 1,
+                  max: total.toDouble(),
+                  value: (scrub ?? (_pageIndex + 1).toDouble())
+                      .clamp(1, total.toDouble()),
+                  divisions: total > 1 ? total - 1 : null,
+                  onChanged: (v) => setState(() => _pageScrub = v),
+                  onChangeEnd: (v) {
+                    setState(() => _pageScrub = null);
+                    _goToPage(v.round() - 1);
+                  },
                 ),
               ),
             ),
-            IconButton(
-              tooltip: l.nextPage,
-              icon: const Icon(Icons.chevron_right),
-              onPressed: _pageIndex < total - 1
-                  ? () => _goToPage(_pageIndex + 1)
-                  : null,
+          ),
+        Material(
+          color: cs.surfaceContainerHigh,
+          elevation: 3,
+          borderRadius: BorderRadius.circular(28),
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
+            child: Row(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                IconButton(
+                  tooltip: l.previousPage,
+                  icon: const Icon(Icons.chevron_left),
+                  onPressed:
+                      _pageIndex > 0 ? () => _goToPage(_pageIndex - 1) : null,
+                ),
+                TextButton(
+                  onPressed: _viewerReady ? _openThumbnails : null,
+                  child: Text(
+                    l.pageOfPages(shown, total),
+                    style: TextStyle(
+                      color: cs.onSurface,
+                      fontWeight: FontWeight.w600,
+                    ),
+                  ),
+                ),
+                IconButton(
+                  tooltip: l.nextPage,
+                  icon: const Icon(Icons.chevron_right),
+                  onPressed: _pageIndex < total - 1
+                      ? () => _goToPage(_pageIndex + 1)
+                      : null,
+                ),
+              ],
             ),
-          ],
+          ),
         ),
-      ),
+      ],
     );
   }
 
@@ -2417,10 +2608,18 @@ class _TextPlacementLayerState extends State<_TextPlacementLayer> {
   PointerDeviceKind? _downKind;
   Offset? _downLocal;
 
+  /// A down→up drift beyond this (px) means the gesture was a scroll/pan
+  /// (e.g. a 1-finger drag that also reaches this translucent layer), not a
+  /// deliberate tap-to-place.
+  static const double _kMaxTapDriftPx = 12.0;
+
   @override
   Widget build(BuildContext context) {
     return GestureDetector(
-      behavior: HitTestBehavior.opaque,
+      // translucent: this layer must NOT swallow the touch/scroll gesture from
+      // pdfrx underneath (only opaque'd taps that resolve to a genuine
+      // tap-to-place, guarded by the drift check below, actually place a box).
+      behavior: HitTestBehavior.translucent,
       onTapDown: (d) {
         _downKind = d.kind;
         _downLocal = d.localPosition;
@@ -2429,6 +2628,11 @@ class _TextPlacementLayerState extends State<_TextPlacementLayer> {
         // A mouse single-click does NOT place (mouse uses double-click); pen and
         // touch place on a single tap.
         if (_downKind == PointerDeviceKind.mouse) return;
+        final down = _downLocal;
+        if (down != null &&
+            (d.localPosition - down).distance > _kMaxTapDriftPx) {
+          return;
+        }
         widget.onPlace(d.localPosition);
       },
       onDoubleTapDown: (d) {
@@ -2450,24 +2654,43 @@ class _TextAnnotationLabel extends StatelessWidget {
     required this.text,
     required this.fontSizePx,
     required this.color,
+    this.fontWeight = FontWeight.w400,
+    this.fontFamily,
     this.onTap,
+    this.onDoubleTap,
+    this.onPanUpdate,
   });
 
   final String text;
   final double fontSizePx;
   final Color color;
+  final FontWeight fontWeight;
+  final String? fontFamily;
+
+  /// Single-tap handler (only wired while the TEXT tool is active).
   final VoidCallback? onTap;
 
+  /// Double-tap handler: ALWAYS wired (regardless of active tool) so a box can
+  /// be reopened for editing at any time.
+  final VoidCallback? onDoubleTap;
+
+  /// TEXT tool drag-to-move (only wired while the TEXT tool is active).
+  final GestureDragUpdateCallback? onPanUpdate;
+
   @override
   Widget build(BuildContext context) {
     return GestureDetector(
       behavior: HitTestBehavior.opaque,
       onTap: onTap,
+      onDoubleTap: onDoubleTap,
+      onPanUpdate: onPanUpdate,
       child: Text(
         text,
         style: TextStyle(
           fontSize: fontSizePx,
           color: color,
+          fontWeight: fontWeight,
+          fontFamily: fontFamily ?? kAnnotationFontFamily,
           height: 1.2,
         ),
       ),
@@ -2489,6 +2712,8 @@ class _TextAnnotationField extends StatefulWidget {
     required this.hintText,
     required this.onChanged,
     required this.onDone,
+    this.fontWeight = FontWeight.w400,
+    this.fontFamily,
   });
 
   final String initialText;
@@ -2497,6 +2722,8 @@ class _TextAnnotationField extends StatefulWidget {
   final String hintText;
   final ValueChanged<String> onChanged;
   final VoidCallback onDone;
+  final FontWeight fontWeight;
+  final String? fontFamily;
 
   @override
   State<_TextAnnotationField> createState() => _TextAnnotationFieldState();
@@ -2545,6 +2772,8 @@ class _TextAnnotationFieldState extends State<_TextAnnotationField> {
         style: TextStyle(
           fontSize: widget.fontSizePx,
           color: widget.color,
+          fontWeight: widget.fontWeight,
+          fontFamily: widget.fontFamily ?? kAnnotationFontFamily,
           height: 1.2,
         ),
         decoration: InputDecoration(

lib/editor/canvas/pen_slide_screen.dart

@@ -22,6 +22,7 @@ import '../input/pen_input_service.dart';
 import '../input/pressure_curve.dart' show kNaturalPressureGamma;
 import '../layout/viewport_fit.dart';
 import '../pdf/slide_export.dart';
+import '../ui/page_nav_shortcuts.dart';
 import '../ui/pen_settings_page.dart';
 import 'editor_tool.dart';
 import 'pen_canvas.dart';
@@ -335,7 +336,15 @@ class _PenSlideScreenState extends State<PenSlideScreen> {
   @override
   Widget build(BuildContext context) {
     final cs = Theme.of(context).colorScheme;
-    return Scaffold(
+    return pageNavShortcuts(
+      onPrevious:
+          _slideIndex > 0 ? () => _goToSlide(_slideIndex - 1) : null,
+      onNext: _slideIndex < _slideCount - 1
+          ? () => _goToSlide(_slideIndex + 1)
+          : null,
+      onFirst: _slideCount > 0 ? () => _goToSlide(0) : null,
+      onLast: _slideCount > 0 ? () => _goToSlide(_slideCount - 1) : null,
+      child: Scaffold(
       body: Stack(
         children: [
           Positioned.fill(child: _buildCanvas()),
@@ -383,6 +392,7 @@ class _PenSlideScreenState extends State<PenSlideScreen> {
             ),
         ],
       ),
+      ),
     );
   }
 

lib/editor/ui/page_nav_shortcuts.dart

@@ -0,0 +1,57 @@
+// lib/editor/ui/page_nav_shortcuts.dart
+//
+// Shared keyboard page navigation for PDF / slide / office editors.
+// Arrow keys + PageUp/PageDown (+ Home/End when provided).
+
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+class PreviousPageIntent extends Intent {
+  const PreviousPageIntent();
+}
+
+class NextPageIntent extends Intent {
+  const NextPageIntent();
+}
+
+class FirstPageIntent extends Intent {
+  const FirstPageIntent();
+}
+
+class LastPageIntent extends Intent {
+  const LastPageIntent();
+}
+
+/// Wraps [child] so ←/→/PageUp/PageDown(/Home/End) drive page changes.
+Widget pageNavShortcuts({
+  required Widget child,
+  required VoidCallback? onPrevious,
+  required VoidCallback? onNext,
+  VoidCallback? onFirst,
+  VoidCallback? onLast,
+}) {
+  return Focus(
+    autofocus: true,
+    child: CallbackShortcuts(
+      bindings: <ShortcutActivator, VoidCallback>{
+        const SingleActivator(LogicalKeyboardKey.arrowLeft): () =>
+            onPrevious?.call(),
+        const SingleActivator(LogicalKeyboardKey.arrowUp): () =>
+            onPrevious?.call(),
+        const SingleActivator(LogicalKeyboardKey.pageUp): () =>
+            onPrevious?.call(),
+        const SingleActivator(LogicalKeyboardKey.arrowRight): () =>
+            onNext?.call(),
+        const SingleActivator(LogicalKeyboardKey.arrowDown): () =>
+            onNext?.call(),
+        const SingleActivator(LogicalKeyboardKey.pageDown): () =>
+            onNext?.call(),
+        if (onFirst != null)
+          const SingleActivator(LogicalKeyboardKey.home): onFirst,
+        if (onLast != null)
+          const SingleActivator(LogicalKeyboardKey.end): onLast,
+      },
+      child: child,
+    ),
+  );
+}