fix: pen size picker in vertical toolbar

lib/components/theming/row_col.dart

@@ -0,0 +1,31 @@
+import 'package:flutter/material.dart';
+
+class RowCol extends StatelessWidget {
+  const RowCol({
+    super.key,
+    required this.axis,
+    this.mainAxisSize = MainAxisSize.max,
+    this.mainAxisAlignment = MainAxisAlignment.start,
+    required this.children,
+  });
+
+  final Axis axis;
+  final MainAxisSize mainAxisSize;
+  final MainAxisAlignment mainAxisAlignment;
+  final List<Widget> children;
+
+  @override
+  Widget build(BuildContext context) {
+    return axis == Axis.horizontal
+        ? Row(
+            mainAxisSize: mainAxisSize,
+            mainAxisAlignment: mainAxisAlignment,
+            children: children,
+          )
+        : Column(
+            mainAxisSize: mainAxisSize,
+            mainAxisAlignment: mainAxisAlignment,
+            children: children,
+          );
+  }
+}

lib/components/toolbar/pen_modal.dart

@@ -1,7 +1,10 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_svg/flutter_svg.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
+import 'package:saber/components/theming/row_col.dart';
 import 'package:saber/components/toolbar/size_picker.dart';
+import 'package:saber/data/extensions/axis_extensions.dart';
+import 'package:saber/data/prefs.dart';
 import 'package:saber/data/tools/_tool.dart';
 import 'package:saber/data/tools/highlighter.dart';
 import 'package:saber/data/tools/pen.dart';
@@ -26,6 +29,7 @@ class PenModal extends StatefulWidget {
 class _PenModalState extends State<PenModal> {
   @override
   Widget build(BuildContext context) {
+    final axis = Prefs.editorToolbarAlignment.value.axis.opposite;
     final Tool currentTool = widget.getTool();
     final Pen currentPen;
     if (currentTool is Pen) {
@@ -34,14 +38,16 @@ class _PenModalState extends State<PenModal> {
       return const SizedBox();
     }
 
-    return Row(
+    return RowCol(
+      axis: axis,
       mainAxisAlignment: MainAxisAlignment.center,
       children: [
         SizePicker(
+          axis: axis,
           pen: currentPen,
         ),
         if (currentPen is! Highlighter && currentPen is! Pencil) ...[
-          const SizedBox(width: 8),
+          const SizedBox.square(dimension: 8),
           IconButton(
             onPressed: () => setState(() {
               widget.setTool(Pen.fountainPen());
@@ -67,6 +73,7 @@ class _PenModalState extends State<PenModal> {
               ),
             ),
           ),
+          const SizedBox.square(dimension: 8),
           IconButton(
             onPressed: () => setState(() {
               widget.setTool(Pen.ballpointPen());
@@ -92,6 +99,7 @@ class _PenModalState extends State<PenModal> {
               ),
             ),
           ),
+          const SizedBox.square(dimension: 8),
           IconButton(
             onPressed: () => setState(() {
               widget.setTool(ShapePen());

lib/components/toolbar/size_picker.dart

@@ -1,14 +1,17 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
+import 'package:saber/components/theming/row_col.dart';
 import 'package:saber/data/tools/pen.dart';
 import 'package:saber/i18n/strings.g.dart';
 
 class SizePicker extends StatefulWidget {
   const SizePicker({
     super.key,
+    required this.axis,
     required this.pen,
   });
 
+  final Axis axis;
   final Pen pen;
 
   @override
@@ -28,7 +31,8 @@ class _SizePickerState extends State<SizePicker> {
   @override
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
-    return Row(
+    return RowCol(
+      axis: widget.axis,
       mainAxisSize: MainAxisSize.min,
       children: [
         Column(
@@ -49,6 +53,7 @@ class _SizePickerState extends State<SizePicker> {
           padding: const EdgeInsets.symmetric(vertical: 8),
           child: _SizeSlider(
             pen: widget.pen,
+            axis: widget.axis,
             setState: setState,
           ),
         ),
@@ -62,17 +67,24 @@ class _SizeSlider extends StatelessWidget {
     // ignore: unused_element
     super.key,
     required this.pen,
+    required this.axis,
     required this.setState,
   });
 
   final Pen pen;
+  final Axis axis;
   final void Function(void Function()) setState;
 
-  static const Size _size = Size(150, 25);
+  static const double _smallLength = 25;
+  static const double _largeLength = 150;
 
-  void onDrag(double localDx) {
-    final relX = clampDouble(localDx / _size.width, 0, 1);
-    final stepsFromMin = (relX * pen.sizeStepsBetweenMinAndMax).round();
+  /// [percent] is a value between 0 and 1
+  /// where 0 is the start of the slider and 1 is the end.
+  ///
+  /// Values outside of this range are allowed but will be clamped.
+  void onDrag(double percent) {
+    percent = clampDouble(percent, 0, 1);
+    final stepsFromMin = (percent * pen.sizeStepsBetweenMinAndMax).round();
     final newSize = pen.sizeMin + stepsFromMin * pen.sizeStep;
     if (newSize == pen.options.size) return;
     setState(() {
@@ -84,16 +96,30 @@ class _SizeSlider extends StatelessWidget {
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
     return GestureDetector(
-      onHorizontalDragStart: (details) => onDrag(details.localPosition.dx),
-      onHorizontalDragUpdate: (details) => onDrag(details.localPosition.dx),
-      child: CustomPaint(
-        size: _size,
-        painter: _SizeSliderPainter(
-          minSize: pen.sizeMin,
-          maxSize: pen.sizeMax,
-          currentSize: pen.options.size,
-          trackColor: colorScheme.onBackground.withOpacity(0.2),
-          thumbColor: colorScheme.primary,
+      onHorizontalDragStart: axis == Axis.horizontal
+          ? (details) => onDrag(details.localPosition.dx / _largeLength)
+          : null,
+      onHorizontalDragUpdate: axis == Axis.horizontal
+          ? (details) => onDrag(details.localPosition.dx / _largeLength)
+          : null,
+      onVerticalDragStart: axis == Axis.vertical
+          ? (details) => onDrag(details.localPosition.dy / _largeLength)
+          : null,
+      onVerticalDragUpdate: axis == Axis.vertical
+          ? (details) => onDrag(details.localPosition.dy / _largeLength)
+          : null,
+      child: RotatedBox(
+        quarterTurns: axis == Axis.horizontal ? 0 : 1,
+        child: CustomPaint(
+          size: const Size(_largeLength, _smallLength),
+          painter: _SizeSliderPainter(
+            axis: axis,
+            minSize: pen.sizeMin,
+            maxSize: pen.sizeMax,
+            currentSize: pen.options.size,
+            trackColor: colorScheme.onBackground.withOpacity(0.2),
+            thumbColor: colorScheme.primary,
+          ),
         ),
       ),
     );
@@ -102,13 +128,15 @@ class _SizeSlider extends StatelessWidget {
 
 class _SizeSliderPainter extends CustomPainter {
   _SizeSliderPainter({
+    required this.axis,
     required this.minSize,
     required this.maxSize,
     required this.currentSize,
     required this.trackColor,
     required this.thumbColor,
   });
 
+  final Axis axis;
   final double minSize;
   final double maxSize;
   final double currentSize;
@@ -158,6 +186,7 @@ class _SizeSliderPainter extends CustomPainter {
   @override
   bool shouldRepaint(covariant CustomPainter oldDelegate) {
     return oldDelegate is! _SizeSliderPainter ||
+        oldDelegate.axis != axis ||
         oldDelegate.minSize != minSize ||
         oldDelegate.maxSize != maxSize ||
         oldDelegate.currentSize != currentSize ||

lib/data/extensions/axis_extensions.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/material.dart';
+
+extension AxisExtensions on Axis {
+  Axis get opposite => switch (this) {
+        Axis.horizontal => Axis.vertical,
+        Axis.vertical => Axis.horizontal,
+      };
+}
+
+extension AxisDirectionExtensions on AxisDirection {
+  Axis get axis => switch (this) {
+        AxisDirection.up || AxisDirection.down => Axis.vertical,
+        AxisDirection.left || AxisDirection.right => Axis.horizontal,
+      };
+}