packages/flutter/lib/src/material/scrollbar_theme.dart - mirrors/flutter - Git at Google

 // Copyright 2014 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 import 'dart:ui' show lerpDouble;

 import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';

 import 'material_state.dart';
 import 'theme.dart';

 // Examples can assume:
 // late BuildContext context;

 /// Defines default property values for descendant [Scrollbar] widgets.
 ///
 /// Descendant widgets obtain the current [ScrollbarThemeData] object with
 /// `ScrollbarTheme.of(context)`. Instances of [ScrollbarThemeData] can be
 /// customized with [ScrollbarThemeData.copyWith].
 ///
 /// Typically the [ScrollbarThemeData] of a [ScrollbarTheme] is specified as
 /// part of the overall [Theme] with [ThemeData.scrollbarTheme].
 ///
 /// All [ScrollbarThemeData] properties are `null` by default. When null, the
 /// [Scrollbar] computes its own default values, typically based on the overall
 /// theme's [ThemeData.colorScheme].
 ///
 /// See also:
 ///
 ///  * [ThemeData], which describes the overall theme information for the
 ///    application.
 @immutable
 class ScrollbarThemeData with Diagnosticable {
   /// Creates a theme that can be used for [ThemeData.scrollbarTheme].
   const ScrollbarThemeData({
     this.thumbVisibility,
     this.thickness,
     this.trackVisibility,
     this.radius,
     this.thumbColor,
     this.trackColor,
     this.trackBorderColor,
     this.crossAxisMargin,
     this.mainAxisMargin,
     this.minThumbLength,
     this.interactive,
     @Deprecated(
       'Use thumbVisibility instead. '
       'This feature was deprecated after v2.9.0-1.0.pre.',
     )
     this.isAlwaysShown,
     @Deprecated(
       'Use ScrollbarThemeData.trackVisibility to resolve based on the current state instead. '
       'This feature was deprecated after v3.4.0-19.0.pre.',
     )
     this.showTrackOnHover,
   }) : assert(
          isAlwaysShown == null || thumbVisibility == null,
          'Scrollbar thumb appearance should only be controlled with thumbVisibility, '
          'isAlwaysShown is deprecated.'
        );

   /// Overrides the default value of [Scrollbar.thumbVisibility] in all
   /// descendant [Scrollbar] widgets.
   ///
   /// Replaces deprecated [isAlwaysShown].
   final MaterialStateProperty<bool?>? thumbVisibility;

   /// Overrides the default value of [Scrollbar.thickness] in all
   /// descendant [Scrollbar] widgets.
   ///
   /// Resolves in the following states:
   ///  * [MaterialState.hovered] on web and desktop platforms.
   final MaterialStateProperty<double?>? thickness;

   /// Overrides the default value of [Scrollbar.trackVisibility] in all
   /// descendant [Scrollbar] widgets.
   final MaterialStateProperty<bool?>? trackVisibility;

   /// Overrides the default value of [Scrollbar.showTrackOnHover] in all
   /// descendant [Scrollbar] widgets.
   @Deprecated(
     'Use ScrollbarThemeData.trackVisibility to resolve based on the current state instead. '
     'This feature was deprecated after v3.4.0-19.0.pre.',
   )
   final bool? showTrackOnHover;

   /// Overrides the default value of [Scrollbar.isAlwaysShown] in all
   /// descendant [Scrollbar] widgets.
   ///
   /// Deprecated in favor of [thumbVisibility].
   @Deprecated(
     'Use thumbVisibility instead. '
     'This feature was deprecated after v2.9.0-1.0.pre.',
   )
   final bool? isAlwaysShown;

   /// Overrides the default value of [Scrollbar.interactive] in all
   /// descendant [Scrollbar] widgets.
   final bool? interactive;

   /// Overrides the default value of [Scrollbar.radius] in all
   /// descendant widgets.
   final Radius? radius;

   /// Overrides the default [Color] of the [Scrollbar] thumb in all descendant
   /// [Scrollbar] widgets.
   ///
   /// Resolves in the following states:
   ///  * [MaterialState.dragged].
   ///  * [MaterialState.hovered] on web and desktop platforms.
   final MaterialStateProperty<Color?>? thumbColor;

   /// Overrides the default [Color] of the [Scrollbar] track when
   /// [showTrackOnHover] is true in all descendant [Scrollbar] widgets.
   ///
   /// Resolves in the following states:
   ///  * [MaterialState.hovered] on web and desktop platforms.
   final MaterialStateProperty<Color?>? trackColor;

   /// Overrides the default [Color] of the [Scrollbar] track border when
   /// [showTrackOnHover] is true in all descendant [Scrollbar] widgets.
   ///
   /// Resolves in the following states:
   ///  * [MaterialState.hovered] on web and desktop platforms.
   final MaterialStateProperty<Color?>? trackBorderColor;

   /// Overrides the default value of the [ScrollbarPainter.crossAxisMargin]
   /// property in all descendant [Scrollbar] widgets.
   ///
   /// See also:
   ///
   ///  * [ScrollbarPainter.crossAxisMargin], which sets the distance from the
   ///    scrollbar's side to the nearest edge in logical pixels.
   final double? crossAxisMargin;

   /// Overrides the default value of the [ScrollbarPainter.mainAxisMargin]
   /// property in all descendant [Scrollbar] widgets.
   ///
   /// See also:
   ///
   ///  * [ScrollbarPainter.mainAxisMargin], which sets the distance from the
   ///    scrollbar's start and end to the edge of the viewport in logical pixels.
   final double? mainAxisMargin;

   /// Overrides the default value of the [ScrollbarPainter.minLength]
   /// property in all descendant [Scrollbar] widgets.
   ///
   /// See also:
   ///
   ///  * [ScrollbarPainter.minLength], which sets the preferred smallest size
   ///    the scrollbar can shrink to when the total scrollable extent is large,
   ///    the current visible viewport is small, and the viewport is not
   ///    overscrolled.
   final double? minThumbLength;

   /// Creates a copy of this object with the given fields replaced with the
   /// new values.
   ScrollbarThemeData copyWith({
     MaterialStateProperty<bool?>? thumbVisibility,
     MaterialStateProperty<double?>? thickness,
     MaterialStateProperty<bool?>? trackVisibility,
     bool? interactive,
     Radius? radius,
     MaterialStateProperty<Color?>? thumbColor,
     MaterialStateProperty<Color?>? trackColor,
     MaterialStateProperty<Color?>? trackBorderColor,
     double? crossAxisMargin,
     double? mainAxisMargin,
     double? minThumbLength,
     @Deprecated(
       'Use thumbVisibility instead. '
       'This feature was deprecated after v2.9.0-1.0.pre.',
     )
     bool? isAlwaysShown,

     @Deprecated(
       'Use ScrollbarThemeData.trackVisibility to resolve based on the current state instead. '
       'This feature was deprecated after v3.4.0-19.0.pre.',
     )
     bool? showTrackOnHover,
   }) {
     return ScrollbarThemeData(
       thumbVisibility: thumbVisibility ?? this.thumbVisibility,
       thickness: thickness ?? this.thickness,
       trackVisibility: trackVisibility ?? this.trackVisibility,
       showTrackOnHover: showTrackOnHover ?? this.showTrackOnHover,
       isAlwaysShown: isAlwaysShown ?? this.isAlwaysShown,
       interactive: interactive ?? this.interactive,
       radius: radius ?? this.radius,
       thumbColor: thumbColor ?? this.thumbColor,
       trackColor: trackColor ?? this.trackColor,
       trackBorderColor: trackBorderColor ?? this.trackBorderColor,
       crossAxisMargin: crossAxisMargin ?? this.crossAxisMargin,
       mainAxisMargin: mainAxisMargin ?? this.mainAxisMargin,
       minThumbLength: minThumbLength ?? this.minThumbLength,
     );
   }

   /// Linearly interpolate between two Scrollbar themes.
   ///
   /// The argument `t` must not be null.
   ///
   /// {@macro dart.ui.shadow.lerp}
   static ScrollbarThemeData lerp(ScrollbarThemeData? a, ScrollbarThemeData? b, double t) {
     assert(t != null);
     return ScrollbarThemeData(
       thumbVisibility: MaterialStateProperty.lerp<bool?>(a?.thumbVisibility, b?.thumbVisibility, t, _lerpBool),
       thickness: MaterialStateProperty.lerp<double?>(a?.thickness, b?.thickness, t, lerpDouble),
       trackVisibility: MaterialStateProperty.lerp<bool?>(a?.trackVisibility, b?.trackVisibility, t, _lerpBool),
       showTrackOnHover: _lerpBool(a?.showTrackOnHover, b?.showTrackOnHover, t),
       isAlwaysShown: _lerpBool(a?.isAlwaysShown, b?.isAlwaysShown, t),
       interactive: _lerpBool(a?.interactive, b?.interactive, t),
       radius: Radius.lerp(a?.radius, b?.radius, t),
       thumbColor: MaterialStateProperty.lerp<Color?>(a?.thumbColor, b?.thumbColor, t, Color.lerp),
       trackColor: MaterialStateProperty.lerp<Color?>(a?.trackColor, b?.trackColor, t, Color.lerp),
       trackBorderColor: MaterialStateProperty.lerp<Color?>(a?.trackBorderColor, b?.trackBorderColor, t, Color.lerp),
       crossAxisMargin: lerpDouble(a?.crossAxisMargin, b?.crossAxisMargin, t),
       mainAxisMargin: lerpDouble(a?.mainAxisMargin, b?.mainAxisMargin, t),
       minThumbLength: lerpDouble(a?.minThumbLength, b?.minThumbLength, t),
     );
   }

   @override
   int get hashCode => Object.hash(
     thumbVisibility,
     thickness,
     trackVisibility,
     showTrackOnHover,
     isAlwaysShown,
     interactive,
     radius,
     thumbColor,
     trackColor,
     trackBorderColor,
     crossAxisMargin,
     mainAxisMargin,
     minThumbLength,
   );

   @override
   bool operator ==(Object other) {
     if (identical(this, other)) {
       return true;
     }
     if (other.runtimeType != runtimeType) {
       return false;
     }
     return other is ScrollbarThemeData
       && other.thumbVisibility == thumbVisibility
       && other.thickness == thickness
       && other.trackVisibility == trackVisibility
       && other.showTrackOnHover == showTrackOnHover
       && other.isAlwaysShown == isAlwaysShown
       && other.interactive == interactive
       && other.radius == radius
       && other.thumbColor == thumbColor
       && other.trackColor == trackColor
       && other.trackBorderColor == trackBorderColor
       && other.crossAxisMargin == crossAxisMargin
       && other.mainAxisMargin == mainAxisMargin
       && other.minThumbLength == minThumbLength;
   }

   @override
   void debugFillProperties(DiagnosticPropertiesBuilder properties) {
     super.debugFillProperties(properties);
     properties.add(DiagnosticsProperty<MaterialStateProperty<bool?>>('thumbVisibility', thumbVisibility, defaultValue: null));
     properties.add(DiagnosticsProperty<MaterialStateProperty<double?>>('thickness', thickness, defaultValue: null));
     properties.add(DiagnosticsProperty<MaterialStateProperty<bool?>>('trackVisibility', trackVisibility, defaultValue: null));
     properties.add(DiagnosticsProperty<bool>('showTrackOnHover', showTrackOnHover, defaultValue: null));
     properties.add(DiagnosticsProperty<bool>('isAlwaysShown', isAlwaysShown, defaultValue: null));
     properties.add(DiagnosticsProperty<bool>('interactive', interactive, defaultValue: null));
     properties.add(DiagnosticsProperty<Radius>('radius', radius, defaultValue: null));
     properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('thumbColor', thumbColor, defaultValue: null));
     properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('trackColor', trackColor, defaultValue: null));
     properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('trackBorderColor', trackBorderColor, defaultValue: null));
     properties.add(DiagnosticsProperty<double>('crossAxisMargin', crossAxisMargin, defaultValue: null));
     properties.add(DiagnosticsProperty<double>('mainAxisMargin', mainAxisMargin, defaultValue: null));
     properties.add(DiagnosticsProperty<double>('minThumbLength', minThumbLength, defaultValue: null));
   }
 }

 bool? _lerpBool(bool? a, bool? b, double t) => t < 0.5 ? a : b;

 /// Applies a scrollbar theme to descendant [Scrollbar] widgets.
 ///
 /// Descendant widgets obtain the current theme's [ScrollbarThemeData] using
 /// [ScrollbarTheme.of]. When a widget uses [ScrollbarTheme.of], it is
 /// automatically rebuilt if the theme later changes.
 ///
 /// A scrollbar theme can be specified as part of the overall Material theme
 /// using [ThemeData.scrollbarTheme].
 ///
 /// See also:
 ///
 ///  * [ScrollbarThemeData], which describes the configuration of a
 ///    scrollbar theme.
 class ScrollbarTheme extends InheritedWidget {
   /// Constructs a scrollbar theme that configures all descendant [Scrollbar]
   /// widgets.
   const ScrollbarTheme({
     super.key,
     required this.data,
     required super.child,
   });

   /// The properties used for all descendant [Scrollbar] widgets.
   final ScrollbarThemeData data;

   /// Returns the configuration [data] from the closest [ScrollbarTheme]
   /// ancestor. If there is no ancestor, it returns [ThemeData.scrollbarTheme].
   ///
   /// Typical usage is as follows:
   ///
   /// ```dart
   /// ScrollbarThemeData theme = ScrollbarTheme.of(context);
   /// ```
   static ScrollbarThemeData of(BuildContext context) {
     final ScrollbarTheme? scrollbarTheme = context.dependOnInheritedWidgetOfExactType<ScrollbarTheme>();
     return scrollbarTheme?.data ?? Theme.of(context).scrollbarTheme;
   }

   @override
   bool updateShouldNotify(ScrollbarTheme oldWidget) => data != oldWidget.data;
 }
	// Copyright 2014 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	import 'dart:ui' show lerpDouble;

	import 'package:flutter/foundation.dart';
	import 'package:flutter/widgets.dart';

	import 'material_state.dart';
	import 'theme.dart';

	// Examples can assume:
	// late BuildContext context;

	/// Defines default property values for descendant [Scrollbar] widgets.
	///
	/// Descendant widgets obtain the current [ScrollbarThemeData] object with
	/// `ScrollbarTheme.of(context)`. Instances of [ScrollbarThemeData] can be
	/// customized with [ScrollbarThemeData.copyWith].
	///
	/// Typically the [ScrollbarThemeData] of a [ScrollbarTheme] is specified as
	/// part of the overall [Theme] with [ThemeData.scrollbarTheme].
	///
	/// All [ScrollbarThemeData] properties are `null` by default. When null, the
	/// [Scrollbar] computes its own default values, typically based on the overall
	/// theme's [ThemeData.colorScheme].
	///
	/// See also:
	///
	/// * [ThemeData], which describes the overall theme information for the
	/// application.
	@immutable
	class ScrollbarThemeData with Diagnosticable {
	/// Creates a theme that can be used for [ThemeData.scrollbarTheme].
	const ScrollbarThemeData({
	this.thumbVisibility,
	this.thickness,
	this.trackVisibility,
	this.radius,
	this.thumbColor,
	this.trackColor,
	this.trackBorderColor,
	this.crossAxisMargin,
	this.mainAxisMargin,
	this.minThumbLength,
	this.interactive,
	@Deprecated(
	'Use thumbVisibility instead. '
	'This feature was deprecated after v2.9.0-1.0.pre.',
	)
	this.isAlwaysShown,
	@Deprecated(
	'Use ScrollbarThemeData.trackVisibility to resolve based on the current state instead. '
	'This feature was deprecated after v3.4.0-19.0.pre.',
	)
	this.showTrackOnHover,
	}) : assert(
	isAlwaysShown == null \|\| thumbVisibility == null,
	'Scrollbar thumb appearance should only be controlled with thumbVisibility, '
	'isAlwaysShown is deprecated.'
	);

	/// Overrides the default value of [Scrollbar.thumbVisibility] in all
	/// descendant [Scrollbar] widgets.
	///
	/// Replaces deprecated [isAlwaysShown].
	final MaterialStateProperty<bool?>? thumbVisibility;

	/// Overrides the default value of [Scrollbar.thickness] in all
	/// descendant [Scrollbar] widgets.
	///
	/// Resolves in the following states:
	/// * [MaterialState.hovered] on web and desktop platforms.
	final MaterialStateProperty<double?>? thickness;

	/// Overrides the default value of [Scrollbar.trackVisibility] in all
	/// descendant [Scrollbar] widgets.
	final MaterialStateProperty<bool?>? trackVisibility;

	/// Overrides the default value of [Scrollbar.showTrackOnHover] in all
	/// descendant [Scrollbar] widgets.
	@Deprecated(
	'Use ScrollbarThemeData.trackVisibility to resolve based on the current state instead. '
	'This feature was deprecated after v3.4.0-19.0.pre.',
	)
	final bool? showTrackOnHover;

	/// Overrides the default value of [Scrollbar.isAlwaysShown] in all
	/// descendant [Scrollbar] widgets.
	///
	/// Deprecated in favor of [thumbVisibility].
	@Deprecated(
	'Use thumbVisibility instead. '
	'This feature was deprecated after v2.9.0-1.0.pre.',
	)
	final bool? isAlwaysShown;

	/// Overrides the default value of [Scrollbar.interactive] in all
	/// descendant [Scrollbar] widgets.
	final bool? interactive;

	/// Overrides the default value of [Scrollbar.radius] in all
	/// descendant widgets.
	final Radius? radius;

	/// Overrides the default [Color] of the [Scrollbar] thumb in all descendant
	/// [Scrollbar] widgets.
	///
	/// Resolves in the following states:
	/// * [MaterialState.dragged].
	/// * [MaterialState.hovered] on web and desktop platforms.
	final MaterialStateProperty<Color?>? thumbColor;

	/// Overrides the default [Color] of the [Scrollbar] track when
	/// [showTrackOnHover] is true in all descendant [Scrollbar] widgets.
	///
	/// Resolves in the following states:
	/// * [MaterialState.hovered] on web and desktop platforms.
	final MaterialStateProperty<Color?>? trackColor;

	/// Overrides the default [Color] of the [Scrollbar] track border when
	/// [showTrackOnHover] is true in all descendant [Scrollbar] widgets.
	///
	/// Resolves in the following states:
	/// * [MaterialState.hovered] on web and desktop platforms.
	final MaterialStateProperty<Color?>? trackBorderColor;

	/// Overrides the default value of the [ScrollbarPainter.crossAxisMargin]
	/// property in all descendant [Scrollbar] widgets.
	///
	/// See also:
	///
	/// * [ScrollbarPainter.crossAxisMargin], which sets the distance from the
	/// scrollbar's side to the nearest edge in logical pixels.
	final double? crossAxisMargin;

	/// Overrides the default value of the [ScrollbarPainter.mainAxisMargin]
	/// property in all descendant [Scrollbar] widgets.
	///
	/// See also:
	///
	/// * [ScrollbarPainter.mainAxisMargin], which sets the distance from the
	/// scrollbar's start and end to the edge of the viewport in logical pixels.
	final double? mainAxisMargin;

	/// Overrides the default value of the [ScrollbarPainter.minLength]
	/// property in all descendant [Scrollbar] widgets.
	///
	/// See also:
	///
	/// * [ScrollbarPainter.minLength], which sets the preferred smallest size
	/// the scrollbar can shrink to when the total scrollable extent is large,
	/// the current visible viewport is small, and the viewport is not
	/// overscrolled.
	final double? minThumbLength;

	/// Creates a copy of this object with the given fields replaced with the
	/// new values.
	ScrollbarThemeData copyWith({
	MaterialStateProperty<bool?>? thumbVisibility,
	MaterialStateProperty<double?>? thickness,
	MaterialStateProperty<bool?>? trackVisibility,
	bool? interactive,
	Radius? radius,
	MaterialStateProperty<Color?>? thumbColor,
	MaterialStateProperty<Color?>? trackColor,
	MaterialStateProperty<Color?>? trackBorderColor,
	double? crossAxisMargin,
	double? mainAxisMargin,
	double? minThumbLength,
	@Deprecated(
	'Use thumbVisibility instead. '
	'This feature was deprecated after v2.9.0-1.0.pre.',
	)
	bool? isAlwaysShown,

	@Deprecated(
	'Use ScrollbarThemeData.trackVisibility to resolve based on the current state instead. '
	'This feature was deprecated after v3.4.0-19.0.pre.',
	)
	bool? showTrackOnHover,
	}) {
	return ScrollbarThemeData(
	thumbVisibility: thumbVisibility ?? this.thumbVisibility,
	thickness: thickness ?? this.thickness,
	trackVisibility: trackVisibility ?? this.trackVisibility,
	showTrackOnHover: showTrackOnHover ?? this.showTrackOnHover,
	isAlwaysShown: isAlwaysShown ?? this.isAlwaysShown,
	interactive: interactive ?? this.interactive,
	radius: radius ?? this.radius,
	thumbColor: thumbColor ?? this.thumbColor,
	trackColor: trackColor ?? this.trackColor,
	trackBorderColor: trackBorderColor ?? this.trackBorderColor,
	crossAxisMargin: crossAxisMargin ?? this.crossAxisMargin,
	mainAxisMargin: mainAxisMargin ?? this.mainAxisMargin,
	minThumbLength: minThumbLength ?? this.minThumbLength,
	);
	}

	/// Linearly interpolate between two Scrollbar themes.
	///
	/// The argument `t` must not be null.
	///
	/// {@macro dart.ui.shadow.lerp}
	static ScrollbarThemeData lerp(ScrollbarThemeData? a, ScrollbarThemeData? b, double t) {
	assert(t != null);
	return ScrollbarThemeData(
	thumbVisibility: MaterialStateProperty.lerp<bool?>(a?.thumbVisibility, b?.thumbVisibility, t, _lerpBool),
	thickness: MaterialStateProperty.lerp<double?>(a?.thickness, b?.thickness, t, lerpDouble),
	trackVisibility: MaterialStateProperty.lerp<bool?>(a?.trackVisibility, b?.trackVisibility, t, _lerpBool),
	showTrackOnHover: _lerpBool(a?.showTrackOnHover, b?.showTrackOnHover, t),
	isAlwaysShown: _lerpBool(a?.isAlwaysShown, b?.isAlwaysShown, t),
	interactive: _lerpBool(a?.interactive, b?.interactive, t),
	radius: Radius.lerp(a?.radius, b?.radius, t),
	thumbColor: MaterialStateProperty.lerp<Color?>(a?.thumbColor, b?.thumbColor, t, Color.lerp),
	trackColor: MaterialStateProperty.lerp<Color?>(a?.trackColor, b?.trackColor, t, Color.lerp),
	trackBorderColor: MaterialStateProperty.lerp<Color?>(a?.trackBorderColor, b?.trackBorderColor, t, Color.lerp),
	crossAxisMargin: lerpDouble(a?.crossAxisMargin, b?.crossAxisMargin, t),
	mainAxisMargin: lerpDouble(a?.mainAxisMargin, b?.mainAxisMargin, t),
	minThumbLength: lerpDouble(a?.minThumbLength, b?.minThumbLength, t),
	);
	}

	@override
	int get hashCode => Object.hash(
	thumbVisibility,
	thickness,
	trackVisibility,
	showTrackOnHover,
	isAlwaysShown,
	interactive,
	radius,
	thumbColor,
	trackColor,
	trackBorderColor,
	crossAxisMargin,
	mainAxisMargin,
	minThumbLength,
	);

	@override
	bool operator ==(Object other) {
	if (identical(this, other)) {
	return true;
	}
	if (other.runtimeType != runtimeType) {
	return false;
	}
	return other is ScrollbarThemeData
	&& other.thumbVisibility == thumbVisibility
	&& other.thickness == thickness
	&& other.trackVisibility == trackVisibility
	&& other.showTrackOnHover == showTrackOnHover
	&& other.isAlwaysShown == isAlwaysShown
	&& other.interactive == interactive
	&& other.radius == radius
	&& other.thumbColor == thumbColor
	&& other.trackColor == trackColor
	&& other.trackBorderColor == trackBorderColor
	&& other.crossAxisMargin == crossAxisMargin
	&& other.mainAxisMargin == mainAxisMargin
	&& other.minThumbLength == minThumbLength;
	}

	@override
	void debugFillProperties(DiagnosticPropertiesBuilder properties) {
	super.debugFillProperties(properties);
	properties.add(DiagnosticsProperty<MaterialStateProperty<bool?>>('thumbVisibility', thumbVisibility, defaultValue: null));
	properties.add(DiagnosticsProperty<MaterialStateProperty<double?>>('thickness', thickness, defaultValue: null));
	properties.add(DiagnosticsProperty<MaterialStateProperty<bool?>>('trackVisibility', trackVisibility, defaultValue: null));
	properties.add(DiagnosticsProperty<bool>('showTrackOnHover', showTrackOnHover, defaultValue: null));
	properties.add(DiagnosticsProperty<bool>('isAlwaysShown', isAlwaysShown, defaultValue: null));
	properties.add(DiagnosticsProperty<bool>('interactive', interactive, defaultValue: null));
	properties.add(DiagnosticsProperty<Radius>('radius', radius, defaultValue: null));
	properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('thumbColor', thumbColor, defaultValue: null));
	properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('trackColor', trackColor, defaultValue: null));
	properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('trackBorderColor', trackBorderColor, defaultValue: null));
	properties.add(DiagnosticsProperty<double>('crossAxisMargin', crossAxisMargin, defaultValue: null));
	properties.add(DiagnosticsProperty<double>('mainAxisMargin', mainAxisMargin, defaultValue: null));
	properties.add(DiagnosticsProperty<double>('minThumbLength', minThumbLength, defaultValue: null));
	}
	}

	bool? _lerpBool(bool? a, bool? b, double t) => t < 0.5 ? a : b;

	/// Applies a scrollbar theme to descendant [Scrollbar] widgets.
	///
	/// Descendant widgets obtain the current theme's [ScrollbarThemeData] using
	/// [ScrollbarTheme.of]. When a widget uses [ScrollbarTheme.of], it is
	/// automatically rebuilt if the theme later changes.
	///
	/// A scrollbar theme can be specified as part of the overall Material theme
	/// using [ThemeData.scrollbarTheme].
	///
	/// See also:
	///
	/// * [ScrollbarThemeData], which describes the configuration of a
	/// scrollbar theme.
	class ScrollbarTheme extends InheritedWidget {
	/// Constructs a scrollbar theme that configures all descendant [Scrollbar]
	/// widgets.
	const ScrollbarTheme({
	super.key,
	required this.data,
	required super.child,
	});

	/// The properties used for all descendant [Scrollbar] widgets.
	final ScrollbarThemeData data;

	/// Returns the configuration [data] from the closest [ScrollbarTheme]
	/// ancestor. If there is no ancestor, it returns [ThemeData.scrollbarTheme].
	///
	/// Typical usage is as follows:
	///
	/// ```dart
	/// ScrollbarThemeData theme = ScrollbarTheme.of(context);
	/// ```
	static ScrollbarThemeData of(BuildContext context) {
	final ScrollbarTheme? scrollbarTheme = context.dependOnInheritedWidgetOfExactType<ScrollbarTheme>();
	return scrollbarTheme?.data ?? Theme.of(context).scrollbarTheme;
	}

	@override
	bool updateShouldNotify(ScrollbarTheme oldWidget) => data != oldWidget.data;
	}