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Fix Scrollbar.thickness
property is ignored when the Scrollbar
is hovered (#144012)
fixes [`Scrollbar.thickness` property is ignored when the `Scrollbar` is hovered](https://github.com/flutter/flutter/issues/143881) ### Code sample <details> <summary>expand to view the code sample</summary> ```dart import 'package:flutter/material.dart'; void main() => runApp(const MyApp()); class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { final ScrollController scrollController = ScrollController(); return MaterialApp( debugShowCheckedModeBanner: false, home: Material( child: ScrollConfiguration( behavior: const NoScrollbarBehavior(), child: ScrollbarTheme( data: ScrollbarThemeData( thickness: MaterialStateProperty.all(25.0), showTrackOnHover: true, ), child: Scrollbar( thickness: 50.0, thumbVisibility: true, radius: const Radius.circular(3.0), controller: scrollController, child: SingleChildScrollView( controller: scrollController, child: const SizedBox(width: 4000.0, height: 4000.0), ), ), ), ), ), ); } } class NoScrollbarBehavior extends ScrollBehavior { const NoScrollbarBehavior(); @override Widget buildScrollbar( BuildContext context, Widget child, ScrollableDetails details) => child; } ``` </details> ### Preview | Before | After | | --------------- | --------------- | | <img src="https://github.com/flutter/flutter/assets/48603081/3537d60d-a5b2-488d-aa99-4c36c3721657" /> | <img src="https://github.com/flutter/flutter/assets/48603081/cfd02095-a327-4b16-8ece-0d1c9e6813ce" /> |
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@ -326,7 +326,8 @@ class _MaterialScrollbarState extends RawScrollbarState<_MaterialScrollbar> {
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MaterialStateProperty<double> get _thickness {
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return MaterialStateProperty.resolveWith((Set<MaterialState> states) {
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if (states.contains(MaterialState.hovered) && _trackVisibility.resolve(states)) {
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return _scrollbarTheme.thickness?.resolve(states)
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return widget.thickness
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?? _scrollbarTheme.thickness?.resolve(states)
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?? _kScrollbarThicknessWithTrack;
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}
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// The default scrollbar thickness is smaller on mobile.
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@ -362,6 +362,7 @@ void main() {
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testWidgets('Scrollbar widget properties take priority over theme', (WidgetTester tester) async {
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const double thickness = 4.0;
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const double edgeMargin = 2.0;
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const bool showTrackOnHover = true;
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const Radius radius = Radius.circular(3.0);
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final ScrollController scrollController = ScrollController();
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@ -394,14 +395,14 @@ void main() {
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find.byType(Scrollbar),
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paints..rrect(
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rrect: RRect.fromRectAndRadius(
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const Rect.fromLTRB(794.0, 0.0, 798.0, 90.0),
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const Rect.fromLTRB(800 - thickness - edgeMargin, 0.0, 798.0, 90.0),
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const Radius.circular(3.0),
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),
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color: _kDefaultIdleThumbColor,
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),
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);
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// Drag scrollbar behavior
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// Drag scrollbar behavior.
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const double scrollAmount = 10.0;
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final TestGesture dragScrollbarGesture = await tester.startGesture(const Offset(797.0, 45.0));
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await tester.pumpAndSettle();
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@ -410,7 +411,7 @@ void main() {
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find.byType(Scrollbar),
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paints..rrect(
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rrect: RRect.fromRectAndRadius(
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const Rect.fromLTRB(794.0, 0.0, 798.0, 90.0),
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const Rect.fromLTRB(800 - thickness - edgeMargin, 0.0, 798.0, 90.0),
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const Radius.circular(3.0),
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),
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// Drag color
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@ -423,7 +424,7 @@ void main() {
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await dragScrollbarGesture.up();
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await tester.pumpAndSettle();
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// Hover scrollbar behavior
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// Hover scrollbar behavior.
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final TestGesture gesture = await tester.createGesture(kind: ui.PointerDeviceKind.mouse);
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await gesture.addPointer();
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await gesture.moveTo(const Offset(794.0, 5.0));
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@ -433,18 +434,18 @@ void main() {
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find.byType(Scrollbar),
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paints
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..rect(
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rect: const Rect.fromLTRB(784.0, 0.0, 800.0, 600.0),
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rect: const Rect.fromLTRB(792.0, 0.0, 800.0, 600.0),
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color: const Color(0x08000000),
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)
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..line(
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p1: const Offset(784.0, 0.0),
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p2: const Offset(784.0, 600.0),
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p1: const Offset(792.0, 0.0),
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p2: const Offset(792.0, 600.0),
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strokeWidth: 1.0,
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color: const Color(0x1a000000),
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)
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..rrect(
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rrect: RRect.fromRectAndRadius(
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const Rect.fromLTRB(786.0, 10.0, 798.0, 100.0),
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const Rect.fromLTRB(800 - thickness - edgeMargin, 10.0, 798.0, 100.0),
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const Radius.circular(3.0),
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),
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// Hover color
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