update

com.unity.uiwidgets/Runtime/material/theme_data.cs

 using System.Collections.Generic;
 using System.Linq;
 using uiwidgets;
+using Unity.UIWidgets.cupertino;
 using Unity.UIWidgets.foundation;
 using Unity.UIWidgets.rendering;
 using Unity.UIWidgets.service;
         public readonly IconThemeData accentIconTheme;
 
         public readonly TabBarTheme tabBarTheme;
+        
         public readonly TooltipThemeData tooltipTheme;
 
         public readonly CardTheme cardTheme;
 
         public readonly ColorScheme colorScheme;
 
+        public readonly SnackBarThemeData snackBarTheme;
+
+        public readonly NavigationRailThemeData navigationRailTheme;
+        
+        public readonly BottomSheetThemeData bottomSheetTheme;
+        
+        public readonly CupertinoThemeData cupertinoOverrideTheme;
+
+        /// A theme for customizing the color, shape, elevation, and text style of
+        /// popup menus.
+        public readonly PopupMenuThemeData popupMenuTheme;
+
+        /// A theme for customizing the color and text style of a [MaterialBanner].
+        public readonly MaterialBannerThemeData bannerTheme;
+
+        /// A theme for customizing the color, thickness, and indents of [Divider]s,
+        /// [VerticalDivider]s, etc.
+        public readonly DividerThemeData dividerTheme;
+
+        
         public readonly ButtonBarThemeData buttonBarTheme;
 
         public ThemeData copyWith(

com.unity.uiwidgets/Runtime/material/navigation_rail.cs

+using System.Collections.Generic;
+using System.Linq;
+using Unity.UIWidgets.animation;
+using Unity.UIWidgets.foundation;
+using Unity.UIWidgets.painting;
+using Unity.UIWidgets.rendering;
+using Unity.UIWidgets.ui;
+using Unity.UIWidgets.widgets;
+using UnityEngine;
+using Color = Unity.UIWidgets.ui.Color;
+using TextStyle = Unity.UIWidgets.painting.TextStyle;
+
+namespace Unity.UIWidgets.material {
+    class NavigationRail : StatefulWidget {
+        public NavigationRail(
+            Color backgroundColor = null,
+            bool? extended = null,
+            Widget leading = null,
+            Widget trailing = null,
+            List<NavigationRailDestination> destinations = null,
+            int? selectedIndex = null,
+            ValueChanged<int> onDestinationSelected = null,
+            float? elevation = null,
+            float? groupAlignment = null,
+            NavigationRailLabelType? labelType = null,
+            TextStyle unselectedLabelTextStyle = null,
+            TextStyle selectedLabelTextStyle = null,
+            IconThemeData unselectedIconTheme = null,
+            IconThemeData selectedIconTheme = null,
+            float? minWidth = null,
+            float? minExtendedWidth = null
+        ) {
+            D.assert(destinations != null && destinations.Count >= 2);
+            D.assert(selectedIndex != null);
+            D.assert(0 <= selectedIndex && selectedIndex < destinations.Count);
+            D.assert(elevation == null || elevation > 0);
+            D.assert(minWidth == null || minWidth > 0);
+            D.assert(minExtendedWidth == null || minExtendedWidth > 0);
+            D.assert((minWidth == null || minExtendedWidth == null) || minExtendedWidth >= minWidth);
+            D.assert(extended != null);
+            D.assert(!extended.Value || (labelType == null || labelType == NavigationRailLabelType.none));
+            this.backgroundColor = backgroundColor;
+            this.extended = extended;
+            this.leading = leading;
+            this.trailing = trailing;
+            this.destinations = destinations;
+            this.selectedIndex = selectedIndex;
+            this.onDestinationSelected = onDestinationSelected;
+            this.elevation = elevation;
+            this.groupAlignment = groupAlignment;
+            this.labelType = labelType;
+            this.unselectedLabelTextStyle = unselectedLabelTextStyle;
+            this.selectedLabelTextStyle = selectedLabelTextStyle;
+            this.unselectedIconTheme = unselectedIconTheme;
+            this.selectedIconTheme = selectedIconTheme;
+            this.minWidth = minWidth;
+            this.minExtendedWidth = minExtendedWidth;
+        }
+
+        public readonly Color backgroundColor;
+
+        public readonly bool? extended;
+
+        public readonly Widget leading;
+
+        public readonly Widget trailing;
+
+        public readonly List<NavigationRailDestination> destinations;
+
+        public readonly int? selectedIndex;
+
+        public readonly ValueChanged<int> onDestinationSelected;
+
+        public readonly float? elevation;
+
+        public readonly float? groupAlignment;
+
+        public readonly NavigationRailLabelType? labelType;
+
+        public readonly TextStyle unselectedLabelTextStyle;
+
+        public readonly TextStyle selectedLabelTextStyle;
+
+        public readonly IconThemeData unselectedIconTheme;
+
+        public readonly IconThemeData selectedIconTheme;
+
+        public readonly float? minWidth;
+
+        public readonly float? minExtendedWidth;
+
+        public static Animation<float> extendedAnimation(BuildContext context) {
+            return context.dependOnInheritedWidgetOfExactType<_ExtendedNavigationRailAnimation>().animation;
+        }
+
+        public override State createState() => new _NavigationRailState();
+    }
+
+    class _NavigationRailState : TickerProviderStateMixin<NavigationRail> {
+        List<AnimationController> _destinationControllers = new List<AnimationController>();
+        List<Animation<float>> _destinationAnimations;
+        AnimationController _extendedController;
+        Animation<float> _extendedAnimation;
+
+        public override void initState() {
+            base.initState();
+            _initControllers();
+        }
+
+        public override void dispose() {
+            _disposeControllers();
+            base.dispose();
+        }
+
+        public override void didUpdateWidget(StatefulWidget oldWidget) {
+            base.didUpdateWidget(oldWidget);
+            var checkOldWidget = (NavigationRail) oldWidget;
+            if (oldWidget is NavigationRail navigationRail) {
+                if (widget.extended != navigationRail.extended) {
+                    if (widget.extended ?? false) {
+                        _extendedController.forward();
+                    }
+                    else {
+                        _extendedController.reverse();
+                    }
+                }
+
+                if (widget.destinations.Count != navigationRail.destinations.Count) {
+                    _resetState();
+                    return;
+                }
+
+                if (widget.selectedIndex != navigationRail.selectedIndex) {
+                    _destinationControllers[navigationRail.selectedIndex.Value].reverse();
+                    _destinationControllers[widget.selectedIndex.Value].forward();
+                    return;
+                }
+            }
+        }
+
+        public override Widget build(BuildContext context) {
+            ThemeData theme = Theme.of(context);
+            NavigationRailThemeData navigationRailTheme = NavigationRailTheme.of(context);
+            MaterialLocalizations localizations = MaterialLocalizations.of(context);
+
+            Color backgroundColor =
+                widget.backgroundColor ?? navigationRailTheme.backgroundColor ?? theme.colorScheme.surface;
+            float elevation = widget.elevation ?? navigationRailTheme.elevation ?? 0;
+            float minWidth = widget.minWidth ?? material_._minRailWidth;
+            float minExtendedWidth = widget.minExtendedWidth ?? material_._minExtendedRailWidth;
+            Color baseSelectedColor = theme.colorScheme.primary;
+            Color baseColor = theme.colorScheme.onSurface.withOpacity(0.64f);
+            IconThemeData defaultUnselectedIconTheme =
+                widget.unselectedIconTheme ?? navigationRailTheme.unselectedIconTheme;
+            IconThemeData unselectedIconTheme = new IconThemeData(
+                size: defaultUnselectedIconTheme?.size ?? 24.0f,
+                color: defaultUnselectedIconTheme?.color ?? theme.colorScheme.onSurface,
+                opacity: defaultUnselectedIconTheme?.opacity ?? 1.0f
+            );
+            IconThemeData defaultSelectedIconTheme = widget.selectedIconTheme ?? navigationRailTheme.selectedIconTheme;
+            IconThemeData selectedIconTheme = new IconThemeData(
+                size: defaultSelectedIconTheme?.size ?? 24.0f,
+                color: defaultSelectedIconTheme?.color ?? theme.colorScheme.primary,
+                opacity: defaultSelectedIconTheme?.opacity ?? 0.64f
+            );
+            TextStyle unselectedLabelTextStyle = theme.textTheme.bodyText1.copyWith(color: baseColor)
+                .merge(widget.unselectedLabelTextStyle ?? navigationRailTheme.unselectedLabelTextStyle);
+            TextStyle selectedLabelTextStyle = theme.textTheme.bodyText1.copyWith(color: baseSelectedColor)
+                .merge(widget.selectedLabelTextStyle ?? navigationRailTheme.selectedLabelTextStyle);
+            float groupAlignment = widget.groupAlignment ?? navigationRailTheme.groupAlignment ?? -1.0f;
+            NavigationRailLabelType labelType =
+                widget.labelType ?? navigationRailTheme.labelType ?? NavigationRailLabelType.none;
+
+            var materialChildren = new List<Widget>();
+            materialChildren.Add(material_._verticalSpacer);
+
+            if (widget.leading != null) {
+                materialChildren.AddRange(new List<Widget>() {
+                    new ConstrainedBox(
+                        constraints: new BoxConstraints(
+                            minWidth: Mathf.Lerp(minWidth, minExtendedWidth, _extendedAnimation.value)
+                        ),
+                        child: widget.leading
+                    ),
+                    material_._verticalSpacer,
+                });
+            }
+
+            var alignChildren = new List<Widget>();
+            for (int i = 0; i < widget.destinations.Count; i += 1) {
+                alignChildren.Add(new _RailDestination(
+                    minWidth: minWidth,
+                    minExtendedWidth: minExtendedWidth,
+                    extendedTransitionAnimation: _extendedAnimation,
+                    selected: widget.selectedIndex == i,
+                    icon: widget.selectedIndex == i ? widget.destinations[i].selectedIcon : widget.destinations[i].icon,
+                    label: widget.destinations[i].label,
+                    destinationAnimation: _destinationAnimations[i],
+                    labelType: labelType,
+                    iconTheme: widget.selectedIndex == i ? selectedIconTheme : unselectedIconTheme,
+                    labelTextStyle: widget.selectedIndex == i ? selectedLabelTextStyle : unselectedLabelTextStyle,
+                    onTap: () => { widget.onDestinationSelected(i); },
+                    indexLabel: localizations.tabLabel(
+                        tabIndex: i + 1,
+                        tabCount: widget.destinations.Count
+                    )
+                ));
+            }
+
+            if (widget.trailing != null) {
+                alignChildren.Add(new ConstrainedBox(
+                    constraints: new BoxConstraints(
+                        minWidth: Mathf.Lerp(minWidth, minExtendedWidth, _extendedAnimation.value)
+                    ),
+                    child: widget.trailing
+                ));
+            }
+
+            materialChildren.Add(new Expanded(
+                child: new Align(
+                    alignment: new Alignment(0, groupAlignment),
+                    child: new Column(
+                        mainAxisSize: MainAxisSize.min,
+                        children: alignChildren
+                    )
+                )
+            ));
+
+            return new _ExtendedNavigationRailAnimation(
+                animation: _extendedAnimation,
+                child: new Material(
+                    elevation: elevation,
+                    color: backgroundColor,
+                    child: new Column(
+                        children: materialChildren
+                    )
+                )
+            );
+        }
+
+        void _disposeControllers() {
+            foreach (AnimationController controller in _destinationControllers) {
+                controller.dispose();
+            }
+
+            _extendedController.dispose();
+        }
+
+        void _initControllers() {
+            _destinationControllers = widget.destinations.Select((destination, i) => {
+                var result = new AnimationController(
+                    duration: ThemeUtils.kThemeAnimationDuration,
+                    vsync: this
+                );
+                result.addListener(_rebuild);
+                return result;
+            }).ToList();
+            _destinationAnimations = _destinationControllers.Select((AnimationController controller) => controller.view)
+                .ToList();
+            _destinationControllers[widget.selectedIndex ?? 0].setValue(1.0f);
+            _extendedController = new AnimationController(
+                duration: ThemeUtils.kThemeAnimationDuration,
+                vsync: this,
+                value: widget.extended ?? false ? 1.0f : 0.0f
+            );
+            _extendedAnimation = new CurvedAnimation(
+                parent: _extendedController,
+                curve: Curves.easeInOut
+            );
+            _extendedController.addListener(() => { _rebuild(); });
+        }
+
+        void _resetState() {
+            _disposeControllers();
+            _initControllers();
+        }
+
+        void _rebuild() {
+            setState(() => {
+                // Rebuilding when any of the controllers tick, i.e. when the items are
+                // animating.
+            });
+        }
+    }
+
+    internal class _RailDestination : StatelessWidget {
+        internal _RailDestination(
+            float? minWidth = null,
+            float? minExtendedWidth = null,
+            Widget icon = null,
+            Widget label = null,
+            Animation<float> destinationAnimation = null,
+            Animation<float> extendedTransitionAnimation = null,
+            NavigationRailLabelType? labelType = null,
+            bool? selected = null,
+            IconThemeData iconTheme = null,
+            TextStyle labelTextStyle = null,
+            VoidCallback onTap = null,
+            string indexLabel = null
+        ) {
+            D.assert(minWidth != null);
+            D.assert(minExtendedWidth != null);
+            D.assert(icon != null);
+            D.assert(label != null);
+            D.assert(destinationAnimation != null);
+            D.assert(extendedTransitionAnimation != null);
+            D.assert(labelType != null);
+            D.assert(selected != null);
+            D.assert(iconTheme != null);
+            D.assert(labelTextStyle != null);
+            D.assert(onTap != null);
+            D.assert(indexLabel != null);
+            this.minWidth = minWidth;
+
+            this.minExtendedWidth = minExtendedWidth;
+
+            this.icon = icon;
+
+            this.label = label;
+
+            this.destinationAnimation = destinationAnimation;
+
+            this.extendedTransitionAnimation = extendedTransitionAnimation;
+
+            this.labelType = labelType;
+
+            this.selected = selected;
+
+            this.iconTheme = iconTheme;
+
+            this.labelTextStyle = labelTextStyle;
+
+            this.onTap = onTap;
+
+            this.indexLabel = indexLabel;
+
+            _positionAnimation = new CurvedAnimation(
+                parent: new ReverseAnimation(destinationAnimation),
+                curve: Curves.easeInOut,
+                reverseCurve: Curves.easeInOut.flipped
+            );
+        }
+
+        public readonly float? minWidth;
+        public readonly float? minExtendedWidth;
+        public readonly Widget icon;
+        public readonly Widget label;
+        public readonly Animation<float> destinationAnimation;
+        public readonly NavigationRailLabelType? labelType;
+        public readonly bool? selected;
+        public readonly Animation<float> extendedTransitionAnimation;
+        public readonly IconThemeData iconTheme;
+        public readonly TextStyle labelTextStyle;
+        public readonly VoidCallback onTap;
+        public readonly string indexLabel;
+
+        public readonly Animation<float> _positionAnimation;
+
+        public override Widget build(BuildContext context) {
+            Widget themedIcon = new IconTheme(
+                data: iconTheme,
+                child: icon
+            );
+
+            Widget styledLabel = new DefaultTextStyle(
+                style: labelTextStyle,
+                child: label
+            );
+            Widget content = null;
+            switch (labelType) {
+                case NavigationRailLabelType.none:
+
+                    Widget iconPart = new SizedBox(
+                        width: minWidth,
+                        height: minWidth,
+                        child: new Align(
+                            alignment: Alignment.center,
+                            child: themedIcon
+                        )
+                    );
+                    if (extendedTransitionAnimation.value == 0) {
+                        content = new Stack(
+                                children: new List<Widget>() {
+                                    iconPart,
+                                    new SizedBox(
+                                        width: 0,
+                                        height: 0,
+                                        child: new Opacity(
+                                            opacity: 0.0f,
+                                            child: label
+                                        )
+                                    )
+                                }
+                            )
+                            ;
+                    }
+                    else {
+                        content = new ConstrainedBox(
+                            constraints: new BoxConstraints(
+                                minWidth: Mathf.Lerp(minWidth ?? 0, minExtendedWidth ?? 0,
+                                    extendedTransitionAnimation.value)
+                            ),
+                            child: new ClipRect(
+                                child: new Row(
+                                    children: new List<Widget> {
+                                        iconPart,
+                                        new Align(
+                                            heightFactor: 1.0f,
+                                            widthFactor: extendedTransitionAnimation.value,
+                                            alignment: AlignmentDirectional.centerStart,
+                                            child: new Opacity(
+                                                opacity: _extendedLabelFadeValue(),
+                                                child: styledLabel
+                                            )
+                                        ),
+                                        new SizedBox(width: material_._horizontalDestinationPadding),
+                                    }
+                                )
+                            )
+                        );
+                    }
+
+                    break;
+                case NavigationRailLabelType.selected:
+
+                    float appearingAnimationValue = 1 - _positionAnimation.value;
+
+                    float verticalPadding = Mathf.Lerp(material_._verticalDestinationPaddingNoLabel,
+                        material_._verticalDestinationPaddingWithLabel, appearingAnimationValue);
+                    content = new Container(
+                        constraints: new BoxConstraints(
+                            minWidth: minWidth ?? 0,
+                            minHeight: minWidth ?? 0
+                        ),
+                        padding: EdgeInsets.symmetric(horizontal: material_._horizontalDestinationPadding),
+                        child:
+                        new ClipRect(
+                            child: new Column(
+                                mainAxisSize: MainAxisSize.min,
+                                mainAxisAlignment: MainAxisAlignment.center,
+                                children: new List<Widget>() {
+                                    new SizedBox(height: verticalPadding),
+                                    themedIcon,
+                                    new Align(
+                                        alignment: Alignment.topCenter,
+                                        heightFactor: appearingAnimationValue,
+                                        widthFactor: 1.0f,
+                                        child: new Opacity(
+                                            opacity: selected ?? false
+                                                ? _normalLabelFadeInValue()
+                                                : _normalLabelFadeOutValue(),
+                                            child: styledLabel
+                                        )
+                                    ),
+                                    new SizedBox(height: verticalPadding)
+                                }
+                            )
+                        )
+                    );
+                    break;
+                case NavigationRailLabelType.all:
+                    content = new Container(
+                        constraints: new BoxConstraints(
+                            minWidth: minWidth ?? 0,
+                            minHeight: minWidth ?? 0
+                        ),
+                        padding: EdgeInsets.symmetric(horizontal: material_._horizontalDestinationPadding),
+                        child:
+                        new Column(
+                            children: new List<Widget>() {
+                                new SizedBox(height: material_._verticalDestinationPaddingWithLabel),
+                                themedIcon,
+                                styledLabel,
+                                new SizedBox(height: material_._verticalDestinationPaddingWithLabel),
+                            }
+                        ));
+                    break;
+            }
+
+            ColorScheme colors = Theme.of(context).colorScheme;
+            return new Material(
+                type: MaterialType.transparency,
+                clipBehavior: Clip.none,
+                child: new InkResponse(
+                    onTap: onTap,
+                    onHover: (_) => { },
+                    highlightShape:
+                    BoxShape.rectangle,
+                    borderRadius:
+                    BorderRadius.all(Radius.circular((minWidth ?? 0) / 2.0f)),
+                    containedInkWell:
+                    true,
+                    splashColor: colors.primary.withOpacity(0.12f),
+                    hoverColor: colors.primary.withOpacity(0.04f),
+                    child: content
+                )
+            );
+        }
+
+        float _normalLabelFadeInValue() {
+            if (destinationAnimation.value < 0.25f) {
+                return 0;
+            }
+            else if (destinationAnimation.value < 0.75f) {
+                return (destinationAnimation.value - 0.25f) * 2;
+            }
+            else {
+                return 1;
+            }
+        }
+
+        float _normalLabelFadeOutValue() {
+            if (destinationAnimation.value > 0.75f) {
+                return (destinationAnimation.value - 0.75f) * 4.0f;
+            }
+            else {
+                return 0;
+            }
+        }
+
+        float _extendedLabelFadeValue() {
+            return extendedTransitionAnimation.value < 0.25f ? extendedTransitionAnimation.value * 4.0f : 1.0f;
+        }
+    }
+
+    public enum NavigationRailLabelType {
+        none,
+
+        selected,
+
+        all,
+    }
+
+    class NavigationRailDestination {
+        public NavigationRailDestination(
+            Widget icon,
+            Widget selectedIcon = null,
+            Widget label = null
+        ) {
+            D.assert(icon != null);
+            selectedIcon = selectedIcon ?? icon;
+            this.icon = icon;
+            this.selectedIcon = selectedIcon;
+            this.label = label;
+        }
+
+        public readonly Widget icon;
+
+        public readonly Widget selectedIcon;
+
+        public readonly Widget label;
+    }
+
+    class _ExtendedNavigationRailAnimation : InheritedWidget {
+        public _ExtendedNavigationRailAnimation(
+            Key key = null,
+            Animation<float> animation = null,
+            Widget child = null
+        ) : base(key: key, child: child) {
+            D.assert(child != null);
+            this.animation = animation;
+        }
+
+        public readonly Animation<float> animation;
+
+        public override bool updateShouldNotify(InheritedWidget oldWidget) =>
+            oldWidget is _ExtendedNavigationRailAnimation extendedNavigationRailAnimation
+            && animation != extendedNavigationRailAnimation.animation;
+    }
+
+
+    public partial class material_ {
+        public static readonly float _minRailWidth = 72.0f;
+        public static readonly float _minExtendedRailWidth = 256.0f;
+        public static readonly float _horizontalDestinationPadding = 8.0f;
+        public static readonly float _verticalDestinationPaddingNoLabel = 24.0f;
+        public static readonly float _verticalDestinationPaddingWithLabel = 16.0f;
+        public static readonly Widget _verticalSpacer = new SizedBox(height: 8.0f);
+    }
+}

com.unity.uiwidgets/Runtime/material/navigation_rail.cs.meta

+fileFormatVersion: 2
+guid: 44154d21b3bb4de8a16fdb712a524a0f
+timeCreated: 1611214615

com.unity.uiwidgets/Runtime/material/navigation_rail_theme.cs

+using System;
+using Unity.UIWidgets.foundation;
+using Unity.UIWidgets.painting;
+using Unity.UIWidgets.widgets;
+using UnityEngine;
+using Color = Unity.UIWidgets.ui.Color;
+using TextStyle = Unity.UIWidgets.painting.TextStyle;
+
+namespace Unity.UIWidgets.material {
+    public class NavigationRailThemeData : Diagnosticable, IEquatable<NavigationRailThemeData> {
+        public NavigationRailThemeData(
+            Color backgroundColor = null,
+            float? elevation = null,
+            TextStyle unselectedLabelTextStyle = null,
+            TextStyle selectedLabelTextStyle = null,
+            IconThemeData unselectedIconTheme = null,
+            IconThemeData selectedIconTheme = null,
+            float? groupAlignment = null,
+            NavigationRailLabelType? labelType = null
+        ) {
+            this.backgroundColor = backgroundColor;
+            this.elevation = elevation;
+            this.unselectedLabelTextStyle = unselectedLabelTextStyle;
+            this.selectedLabelTextStyle = selectedLabelTextStyle;
+            this.unselectedIconTheme = unselectedIconTheme;
+            this.selectedIconTheme = selectedIconTheme;
+            this.groupAlignment = groupAlignment;
+            this.labelType = labelType;
+        }
+
+        public readonly Color backgroundColor;
+
+        public readonly float? elevation;
+
+        public readonly TextStyle unselectedLabelTextStyle;
+
+        public readonly TextStyle selectedLabelTextStyle;
+
+        public readonly IconThemeData unselectedIconTheme;
+
+        public readonly IconThemeData selectedIconTheme;
+
+        public readonly float? groupAlignment;
+
+        public readonly NavigationRailLabelType? labelType;
+
+        NavigationRailThemeData copyWith(
+            Color backgroundColor,
+            float? elevation,
+            TextStyle unselectedLabelTextStyle,
+            TextStyle selectedLabelTextStyle,
+            IconThemeData unselectedIconTheme,
+            IconThemeData selectedIconTheme,
+            float? groupAlignment,
+            NavigationRailLabelType? labelType
+        ) {
+            return new NavigationRailThemeData(
+                backgroundColor: backgroundColor ?? this.backgroundColor,
+                elevation: elevation ?? this.elevation,
+                unselectedLabelTextStyle: unselectedLabelTextStyle ?? this.unselectedLabelTextStyle,
+                selectedLabelTextStyle: selectedLabelTextStyle ?? this.selectedLabelTextStyle,
+                unselectedIconTheme: unselectedIconTheme ?? this.unselectedIconTheme,
+                selectedIconTheme: selectedIconTheme ?? this.selectedIconTheme,
+                groupAlignment: groupAlignment ?? this.groupAlignment,
+                labelType: labelType ?? this.labelType
+            );
+        }
+
+        static NavigationRailThemeData lerp(NavigationRailThemeData a, NavigationRailThemeData b, float t) {
+            if (a == null && b == null)
+                return null;
+            return new NavigationRailThemeData(
+                backgroundColor: Color.lerp(a?.backgroundColor, b?.backgroundColor, t),
+                elevation: Mathf.Lerp(a?.elevation ?? 0, b?.elevation ?? 0, t),
+                unselectedLabelTextStyle: TextStyle.lerp(a?.unselectedLabelTextStyle, b?.unselectedLabelTextStyle, t),
+                selectedLabelTextStyle: TextStyle.lerp(a?.selectedLabelTextStyle, b?.selectedLabelTextStyle, t),
+                unselectedIconTheme: IconThemeData.lerp(a?.unselectedIconTheme, b?.unselectedIconTheme, t),
+                selectedIconTheme: IconThemeData.lerp(a?.selectedIconTheme, b?.selectedIconTheme, t),
+                groupAlignment: Mathf.Lerp(a?.groupAlignment ?? 0, b?.groupAlignment ?? 0, t),
+                labelType: t < 0.5 ? a?.labelType : b?.labelType
+            );
+        }
+
+        public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
+            base.debugFillProperties(properties);
+            NavigationRailThemeData defaultData = new NavigationRailThemeData();
+
+            properties.add(new ColorProperty("backgroundColor", backgroundColor,
+                defaultValue: defaultData.backgroundColor));
+            properties.add(new FloatProperty("elevation", elevation, defaultValue: defaultData.elevation));
+            properties.add(new DiagnosticsProperty<TextStyle>("unselectedLabelTextStyle", unselectedLabelTextStyle,
+                defaultValue: defaultData.unselectedLabelTextStyle));
+            properties.add(new DiagnosticsProperty<TextStyle>("selectedLabelTextStyle", selectedLabelTextStyle,
+                defaultValue: defaultData.selectedLabelTextStyle));
+            properties.add(new DiagnosticsProperty<IconThemeData>("unselectedIconTheme", unselectedIconTheme,
+                defaultValue: defaultData.unselectedIconTheme));
+            properties.add(new DiagnosticsProperty<IconThemeData>("selectedIconTheme", selectedIconTheme,
+                defaultValue: defaultData.selectedIconTheme));
+            properties.add(
+                new FloatProperty("groupAlignment", groupAlignment, defaultValue: defaultData.groupAlignment));
+            properties.add(new DiagnosticsProperty<NavigationRailLabelType?>("labelType", labelType,
+                defaultValue: defaultData.labelType));
+        }
+
+        public static bool operator ==(NavigationRailThemeData self, NavigationRailThemeData other) {
+            return Equals(self, other);
+        }
+
+        public static bool operator !=(NavigationRailThemeData self, NavigationRailThemeData other) {
+            return Equals(self, other);
+        }
+
+        public bool Equals(NavigationRailThemeData other) {
+            if (ReferenceEquals(null, other)) {
+                return false;
+            }
+
+            if (ReferenceEquals(this, other)) {
+                return true;
+            }
+
+            return Equals(backgroundColor, other.backgroundColor) && Nullable.Equals(elevation, other.elevation) &&
+                   Equals(unselectedLabelTextStyle, other.unselectedLabelTextStyle) &&
+                   Equals(selectedLabelTextStyle, other.selectedLabelTextStyle) &&
+                   Equals(unselectedIconTheme, other.unselectedIconTheme) &&
+                   Equals(selectedIconTheme, other.selectedIconTheme) &&
+                   Nullable.Equals(groupAlignment, other.groupAlignment) && labelType == other.labelType;
+        }
+
+        public override bool Equals(object obj) {
+            if (ReferenceEquals(null, obj)) {
+                return false;
+            }
+
+            if (ReferenceEquals(this, obj)) {
+                return true;
+            }
+
+            if (obj.GetType() != GetType()) {
+                return false;
+            }
+
+            return Equals((NavigationRailThemeData) obj);
+        }
+
+        public override int GetHashCode() {
+            unchecked {
+                var hashCode = (backgroundColor != null ? backgroundColor.GetHashCode() : 0);
+                hashCode = (hashCode * 397) ^ elevation.GetHashCode();
+                hashCode = (hashCode * 397) ^
+                           (unselectedLabelTextStyle != null ? unselectedLabelTextStyle.GetHashCode() : 0);
+                hashCode = (hashCode * 397) ^
+                           (selectedLabelTextStyle != null ? selectedLabelTextStyle.GetHashCode() : 0);
+                hashCode = (hashCode * 397) ^ (unselectedIconTheme != null ? unselectedIconTheme.GetHashCode() : 0);
+                hashCode = (hashCode * 397) ^ (selectedIconTheme != null ? selectedIconTheme.GetHashCode() : 0);
+                hashCode = (hashCode * 397) ^ groupAlignment.GetHashCode();
+                hashCode = (hashCode * 397) ^ labelType.GetHashCode();
+                return hashCode;
+            }
+        }
+    }
+
+    public class NavigationRailTheme : InheritedTheme {
+        public NavigationRailTheme(
+            Key key = null,
+            NavigationRailThemeData data = null,
+            Widget child = null
+        ) : base(key: key, child: child) {
+            D.assert(data != null);
+            this.data = data;
+        }
+
+        public readonly NavigationRailThemeData data;
+
+        public static NavigationRailThemeData of(BuildContext context) {
+            NavigationRailTheme navigationRailTheme =
+                context.dependOnInheritedWidgetOfExactType<NavigationRailTheme>();
+            return navigationRailTheme?.data ?? Theme.of(context).navigationRailTheme;
+        }
+
+        public override Widget wrap(BuildContext context, Widget child) {
+            NavigationRailTheme ancestorTheme = context.findAncestorWidgetOfExactType<NavigationRailTheme>();
+            return ReferenceEquals(this, ancestorTheme) ? child : new NavigationRailTheme(data: data, child: child);
+        }
+
+        public override bool updateShouldNotify(InheritedWidget oldWidget) =>
+            oldWidget is NavigationRailTheme navigationRail && data != navigationRail.data;
+    }
+}

com.unity.uiwidgets/Runtime/material/navigation_rail_theme.cs.meta

+fileFormatVersion: 2
+guid: ea446a1e5a704c9faf0c50c5d1f9d5a8
+timeCreated: 1611214357

com.unity.uiwidgets/Runtime/material/snack_bar_theme.cs

+using System;
+using Unity.UIWidgets.foundation;
+using Unity.UIWidgets.material;
+using Unity.UIWidgets.painting;
+using UnityEngine;
+using Color = Unity.UIWidgets.ui.Color;
+using Object = UnityEngine.Object;
+using TextStyle = Unity.UIWidgets.painting.TextStyle;
+
+namespace Unity.UIWidgets.material {
+    public enum SnackBarBehavior {
+        fix,
+        floating,
+    }
+
+    public class SnackBarThemeData : Diagnosticable, IEquatable<SnackBarThemeData> {
+        public SnackBarThemeData(
+            Color backgroundColor,
+            Color actionTextColor,
+            Color disabledActionTextColor,
+            TextStyle contentTextStyle,
+            float? elevation,
+            ShapeBorder shape,
+            SnackBarBehavior behavior
+        ) {
+            D.assert(elevation == null || elevation >= 0.0f);
+
+            this.backgroundColor = backgroundColor;
+            this.actionTextColor = actionTextColor;
+            this.disabledActionTextColor = disabledActionTextColor;
+            this.contentTextStyle = contentTextStyle;
+            this.elevation = elevation;
+            this.shape = shape;
+            this.behavior = behavior;
+        }
+
+        public readonly Color backgroundColor;
+
+        public readonly Color actionTextColor;
+
+        public readonly Color disabledActionTextColor;
+
+        public readonly TextStyle contentTextStyle;
+
+        public readonly float? elevation;
+
+        public readonly ShapeBorder shape;
+
+        public readonly SnackBarBehavior behavior;
+
+        public SnackBarThemeData copyWith(
+            Color backgroundColor,
+            Color actionTextColor,
+            Color disabledActionTextColor,
+            TextStyle contentTextStyle,
+            float? elevation,
+            ShapeBorder shape,
+            SnackBarBehavior? behavior
+        ) {
+            return new SnackBarThemeData(
+                backgroundColor: backgroundColor ?? this.backgroundColor,
+                actionTextColor: actionTextColor ?? this.actionTextColor,
+                disabledActionTextColor: disabledActionTextColor ?? this.disabledActionTextColor,
+                contentTextStyle: contentTextStyle ?? this.contentTextStyle,
+                elevation: elevation ?? this.elevation,
+                shape: shape ?? this.shape,
+                behavior: behavior ?? this.behavior
+            );
+        }
+
+        static SnackBarThemeData lerp(SnackBarThemeData a, SnackBarThemeData b, float t) {
+            return new SnackBarThemeData(
+                backgroundColor: Color.lerp(a?.backgroundColor, b?.backgroundColor, t),
+                actionTextColor: Color.lerp(a?.actionTextColor, b?.actionTextColor, t),
+                disabledActionTextColor: Color.lerp(a?.disabledActionTextColor, b?.disabledActionTextColor, t),
+                contentTextStyle: TextStyle.lerp(a?.contentTextStyle, b?.contentTextStyle, t),
+                elevation: Mathf.Lerp(a?.elevation ?? 0, b?.elevation ?? 0, t),
+                shape: ShapeBorder.lerp(a?.shape, b?.shape, t),
+                behavior: t < 0.5 ? a.behavior : b.behavior
+            );
+        }
+
+        public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
+            base.debugFillProperties(properties);
+            properties.add(new ColorProperty("backgroundColor", backgroundColor, defaultValue: null));
+            properties.add(new ColorProperty("actionTextColor", actionTextColor, defaultValue: null));
+            properties.add(new ColorProperty("disabledActionTextColor", disabledActionTextColor, defaultValue: null));
+            properties.add(
+                new DiagnosticsProperty<TextStyle>("contentTextStyle", contentTextStyle, defaultValue: null));
+            properties.add(new FloatProperty("elevation", elevation, defaultValue: null));
+            properties.add(new DiagnosticsProperty<ShapeBorder>("shape", shape, defaultValue: null));
+            properties.add(new DiagnosticsProperty<SnackBarBehavior>("behavior", behavior, defaultValue: null));
+        }
+
+        public static bool operator ==(SnackBarThemeData self, SnackBarThemeData other) {
+            return Equals(self, other);
+        }
+
+        public static bool operator !=(SnackBarThemeData self, SnackBarThemeData other) {
+            return Equals(self, other);
+        }
+
+        public bool Equals(SnackBarThemeData other) {
+            if (ReferenceEquals(null, other)) {
+                return false;
+            }
+
+            if (ReferenceEquals(this, other)) {
+                return true;
+            }
+
+            return Equals(backgroundColor, other.backgroundColor) && Equals(actionTextColor, other.actionTextColor) &&
+                   Equals(disabledActionTextColor, other.disabledActionTextColor) &&
+                   Equals(contentTextStyle, other.contentTextStyle) && Nullable.Equals(elevation, other.elevation) &&
+                   Equals(shape, other.shape) && behavior == other.behavior;
+        }
+
+        public override bool Equals(object obj) {
+            if (ReferenceEquals(null, obj)) {
+                return false;
+            }
+
+            if (ReferenceEquals(this, obj)) {
+                return true;
+            }
+
+            if (obj.GetType() != GetType()) {
+                return false;
+            }
+
+            return Equals((SnackBarThemeData) obj);
+        }
+
+        public override int GetHashCode() {
+            unchecked {
+                var hashCode = (backgroundColor != null ? backgroundColor.GetHashCode() : 0);
+                hashCode = (hashCode * 397) ^ (actionTextColor != null ? actionTextColor.GetHashCode() : 0);
+                hashCode = (hashCode * 397) ^
+                           (disabledActionTextColor != null ? disabledActionTextColor.GetHashCode() : 0);
+                hashCode = (hashCode * 397) ^ (contentTextStyle != null ? contentTextStyle.GetHashCode() : 0);
+                hashCode = (hashCode * 397) ^ elevation.GetHashCode();
+                hashCode = (hashCode * 397) ^ (shape != null ? shape.GetHashCode() : 0);
+                hashCode = (hashCode * 397) ^ (int) behavior;
+                return hashCode;
+            }
+        }
+    }
+}

com.unity.uiwidgets/Runtime/material/snack_bar_theme.cs.meta

+fileFormatVersion: 2
+guid: e778095633af486ebf85e2dc802baf55
+timeCreated: 1611212714