Merge branch 'dev_1.17.5' into shiyun/skia

com.unity.uiwidgets/Runtime/animation/animation_controller.cs

 
                 return true;
             });
+            _ticker.Dispose();
             _ticker = null;
             base.dispose();
         }

com.unity.uiwidgets/Runtime/animation/listener_helpers.mixin.gen.cs

 
  
     public abstract class AnimationLazyListenerMixinAnimation<T> : Animation<T> {
-        int _listenerCounter;
+        int _listenerCounter = 0;
 
         protected void didRegisterListener() {
             D.assert(_listenerCounter >= 0);
                 D.assert(() => {
                       IEnumerable<DiagnosticsNode> infoCollector() {
                           yield return new DiagnosticsProperty<AnimationLocalListenersMixinAnimationLazyListenerMixinAnimation<T>>(
-                              "The " + GetType() + " notifying listeners was:",
+                              "The " + GetType() + " notifying listeners was",
                               this,
                               style: DiagnosticsTreeStyle.errorProperty
                           );
                 D.assert(() => {
                       IEnumerable<DiagnosticsNode> infoCollector() {
                           yield return new DiagnosticsProperty<AnimationLocalListenersMixinAnimationEagerListenerMixinAnimation<T>>(
-                              "The " + GetType() + " notifying listeners was:",
+                              "The " + GetType() + " notifying listeners was",
                               this,
                               style: DiagnosticsTreeStyle.errorProperty
                           );
                     D.assert(() => {
                         IEnumerable<DiagnosticsNode> infoCollector() {
                             yield return new DiagnosticsProperty<AnimationLocalStatusListenersMixinAnimationLocalListenersMixinAnimationLazyListenerMixinAnimation<T>>(
-                                "The " + GetType() + " notifying status listeners was:",
+                                "The " + GetType() + " notifying status listeners was",
                                 this,
                                 style: DiagnosticsTreeStyle.errorProperty
                             );
                     D.assert(() => {
                         IEnumerable<DiagnosticsNode> infoCollector() {
                             yield return new DiagnosticsProperty<AnimationLocalStatusListenersMixinAnimationLazyListenerMixinAnimation<T>>(
-                                "The " + GetType() + " notifying status listeners was:",
+                                "The " + GetType() + " notifying status listeners was",
                                 this,
                                 style: DiagnosticsTreeStyle.errorProperty
                             );
                     D.assert(() => {
                         IEnumerable<DiagnosticsNode> infoCollector() {
                             yield return new DiagnosticsProperty<AnimationLocalStatusListenersMixinAnimationLocalListenersMixinAnimationEagerListenerMixinAnimation<T>>(
-                                "The " + GetType() + " notifying status listeners was:",
+                                "The " + GetType() + " notifying status listeners was",
                                 this,
                                 style: DiagnosticsTreeStyle.errorProperty
                             );

com.unity.uiwidgets/Runtime/animation/listener_helpers.mixin.njk

                 D.assert(() => {
                       IEnumerable<DiagnosticsNode> infoCollector() {
                           yield return new DiagnosticsProperty<AnimationLocalListenersMixin{{with | safe}}>(
-                              "The " + this.GetType() + " notifying listeners was:",
+                              "The " + this.GetType() + " notifying listeners was",
                               this,
                               style: DiagnosticsTreeStyle.errorProperty
                           );
                     D.assert(() => {
                         IEnumerable<DiagnosticsNode> infoCollector() {
                             yield return new DiagnosticsProperty<AnimationLocalStatusListenersMixin{{with | safe}}>(
-                                "The " + this.GetType() + " notifying status listeners was:",
+                                "The " + this.GetType() + " notifying status listeners was",
                                 this,
                                 style: DiagnosticsTreeStyle.errorProperty
                             );

com.unity.uiwidgets/Runtime/gestures/multidrag.cs

 using System;
 using System.Collections.Generic;
+using System.Linq;
 using Unity.UIWidgets.async2;
 using Unity.UIWidgets.foundation;
 using Unity.UIWidgets.ui;
 
 
         public override void dispose() {
-            foreach (var key in _pointers.Keys) {
+            foreach (var key in _pointers.Keys.ToList()) {
                 _removeState(key);
             }
             D.assert(_pointers.isEmpty);

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

             MaterialBannerThemeData bannerTheme = MaterialBannerTheme.of(context);
 
             bool isSingleRow = actions.Count == 1 && !forceActionsBelow;
-            EdgeInsetsGeometry padding = this.padding ?? bannerTheme.padding ?? (isSingleRow
+            EdgeInsetsGeometry padding = this.padding ?? bannerTheme?.padding ?? (isSingleRow
-                                                ?? bannerTheme.padding
+                                                ?? bannerTheme?.padding
                                                 ?? EdgeInsetsDirectional.only(end: 16.0f);
 
             Widget buttonBar = new ButtonBar(
 
             Color backgroundColor = this.backgroundColor
-                                    ?? bannerTheme.backgroundColor
+                                    ?? bannerTheme?.backgroundColor
-                                  ?? bannerTheme.contentTextStyle
+                                  ?? bannerTheme?.contentTextStyle
                                   ?? theme.textTheme.bodyText2;
 
             var rowList = new List<Widget>();

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

 
         public override Widget build(BuildContext context) {
             BottomAppBarTheme babTheme = BottomAppBarTheme.of(context);
-            NotchedShape notchedShape = widget.shape ?? babTheme.shape;
+            NotchedShape notchedShape = widget.shape ?? babTheme?.shape;
             CustomClipper<Path> clipper = notchedShape != null
                 ? (CustomClipper<Path>) new _BottomAppBarClipper(
                     geometry: geometryListenable,
                 : new ShapeBorderClipper(shape: new RoundedRectangleBorder());
             
-            float elevation = widget.elevation ?? babTheme.elevation ?? _defaultElevation;
-            Color color = widget.color ?? babTheme.color ?? Theme.of(context).bottomAppBarColor;
+            float elevation = widget.elevation ?? babTheme?.elevation ?? _defaultElevation;
+            Color color = widget.color ?? babTheme?.color ?? Theme.of(context).bottomAppBarColor;
             Color effectiveColor = ElevationOverlay.applyOverlay(context, color, elevation);
             return new PhysicalShape(
                 clipper: clipper,

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

 
         public override Widget build(BuildContext context) {
             BottomSheetThemeData bottomSheetTheme = Theme.of(context).bottomSheetTheme;
-            Color color = widget.backgroundColor ?? bottomSheetTheme.backgroundColor;
-            float elevation = widget.elevation ?? bottomSheetTheme.elevation ?? 0;
-            ShapeBorder shape = widget.shape ?? bottomSheetTheme.shape;
-            Clip clipBehavior = widget.clipBehavior ?? bottomSheetTheme.clipBehavior ?? Clip.none;
+            Color color = widget.backgroundColor ?? bottomSheetTheme?.backgroundColor;
+            float elevation = widget.elevation ?? bottomSheetTheme?.elevation ?? 0;
+            ShapeBorder shape = widget.shape ?? bottomSheetTheme?.shape;
+            Clip clipBehavior = widget.clipBehavior ?? bottomSheetTheme?.clipBehavior ?? Clip.none;
 
             Widget bottomSheet = new Material(
                 key: _childKey,

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

                 position: center,
                 hitTest: (BoxHitTestResult boxHitTest, Offset offsetPosition) => {
                     D.assert(offsetPosition == center);
-                    return child.hitTest(boxHitTest, position: center);
+                    //WARNING: inconsistent with flutter (zxw): I believe that there is a bug here in flutter
+                    //in flutter, the following line is "return child.hitTest(boxHitTest, position: center); ". This is nonsense since it will always return true regardless of the value of the input parameter: position.
+                    //we have tested a bit in flutter and found that, since an inputPadding has a Semantics as it parent which shares the same size, the Semantics's hitTest can hide this bug in flutter
+                    //Therefore this bug only occurs in UIWidgets
+                    //We are not very clear whether this is the best fix though. Please feel free to optimize it
+                    return child.hitTest(boxHitTest, position: position);
                 }
             );
         }

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

             ButtonBarThemeData barTheme = ButtonBarTheme.of(context);
 
             ButtonThemeData buttonTheme = parentButtonTheme.copyWith(
-                textTheme: buttonTextTheme ?? barTheme.buttonTextTheme ?? ButtonTextTheme.primary,
-                minWidth: buttonMinWidth ?? barTheme.buttonMinWidth ?? 64.0f,
-                height: buttonHeight ?? barTheme.buttonHeight ?? 36.0f,
-                padding: buttonPadding ?? barTheme.buttonPadding ?? EdgeInsets.symmetric(horizontal: 8.0f),
-                alignedDropdown: buttonAlignedDropdown ?? barTheme.buttonAlignedDropdown ?? false,
-                layoutBehavior: layoutBehavior ?? barTheme.layoutBehavior ?? ButtonBarLayoutBehavior.padded
+                textTheme: buttonTextTheme ?? barTheme?.buttonTextTheme ?? ButtonTextTheme.primary,
+                minWidth: buttonMinWidth ?? barTheme?.buttonMinWidth ?? 64.0f,
+                height: buttonHeight ?? barTheme?.buttonHeight ?? 36.0f,
+                padding: buttonPadding ?? barTheme?.buttonPadding ?? EdgeInsets.symmetric(horizontal: 8.0f),
+                alignedDropdown: buttonAlignedDropdown ?? barTheme?.buttonAlignedDropdown ?? false,
+                layoutBehavior: layoutBehavior ?? barTheme?.layoutBehavior ?? ButtonBarLayoutBehavior.padded
             );
 
             float paddingUnit = buttonTheme.padding.horizontal / 4.0f;
-                    mainAxisAlignment: alignment ?? barTheme.alignment ?? MainAxisAlignment.end,
-                    mainAxisSize: mainAxisSize ?? barTheme.mainAxisSize ?? MainAxisSize.max,
-                    overflowDirection: overflowDirection ?? barTheme.overflowDirection ?? VerticalDirection.down,
+                    mainAxisAlignment: alignment ?? barTheme?.alignment ?? MainAxisAlignment.end,
+                    mainAxisSize: mainAxisSize ?? barTheme?.mainAxisSize ?? MainAxisSize.max,
+                    overflowDirection: overflowDirection ?? barTheme?.overflowDirection ?? VerticalDirection.down,
                     children: children.Select((Widget childWidget) => {
                         return (Widget) new Padding(
                             padding: EdgeInsets.symmetric(horizontal: paddingUnit),

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

             float? indent = null,
             float? endIndent = null,
             Color color = null) : base(key: key) {
-            D.assert(height >= 0.0);
+            D.assert(height == null || height >= 0.0);
+            D.assert(thickness == null || thickness >= 0.0);
+            D.assert(indent == null || indent >= 0.0);
+            D.assert(endIndent == null || endIndent >= 0.0);
             this.height = height;
             this.thickness = thickness;
             this.indent = indent;
         public static BorderSide createBorderSide(BuildContext context, Color color = null, float? width = null) {
             Color effectiveColor = color
                                    ?? (context != null
-                                       ? (DividerTheme.of(context).color ?? Theme.of(context).dividerColor)
+                                       ? (DividerTheme.of(context)?.color ?? Theme.of(context).dividerColor)
-                                   ?? (context != null ? DividerTheme.of(context).thickness : null)
+                                   ?? (context != null ? DividerTheme.of(context)?.thickness : null)
                                    ?? 0.0f;
 
             // Prevent assertion since it is possible that context is null and no color
 
         public override Widget build(BuildContext context) {
             DividerThemeData dividerTheme = DividerTheme.of(context);
-            float height = this.height ?? dividerTheme.space ?? 16.0f;
-            float thickness = this.thickness ?? dividerTheme.thickness ?? 0.0f;
-            float indent = this.indent ?? dividerTheme.indent ?? 0.0f;
-            float endIndent = this.endIndent ?? dividerTheme.endIndent ?? 0.0f;
+            float height = this.height ?? dividerTheme?.space ?? 16.0f;
+            float thickness = this.thickness ?? dividerTheme?.thickness ?? 0.0f;
+            float indent = this.indent ?? dividerTheme?.indent ?? 0.0f;
+            float endIndent = this.endIndent ?? dividerTheme?.endIndent ?? 0.0f;
 
             return new SizedBox(
                 height: height,
                         //TODO: update to EdgeInsetsGeometry
-                        margin: (EdgeInsets) (EdgeInsetsGeometry) EdgeInsetsDirectional.only(start: indent,
-                            end: endIndent),
+                        /*margin: EdgeInsetsDirectional.only(start: indent,
+                            end: endIndent),*/
                         decoration: new BoxDecoration(
                             border: new Border(
                                 bottom: createBorderSide(context, color: color, width: thickness))

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

         }
 
         public void updateHighlight(_HighlightType type, bool value) {
-            InkHighlight highlight = _highlights[type];
+            InkHighlight highlight = _highlights.getOrDefault(type);
-                D.assert(_highlights[type] != null);
+                D.assert(_highlights.getOrDefault(type) != null);
                 _highlights[type] = null;
                 updateKeepAlive();
             }
                 highlight.deactivate();
             }
 
-            D.assert(value == (_highlights[type] != null && _highlights[type].active));
+            D.assert(value == (_highlights.getOrDefault(type) != null && _highlights[type].active));
             switch (type) {
                 case _HighlightType.pressed: {
                     if (widget.onHighlightChanged != null)
                 radius: widget.radius,
                 borderRadius: borderRadius,
                 customBorder: customBorder,
-                onRemoved: OnRemoved);
+                onRemoved: OnRemoved,
+                textDirection: Directionality.of(context));
 
             return splash;
         }
             }
 
             D.assert(_currentSplash == null);
-            foreach (_HighlightType highlight in _highlights.Keys) {
+            foreach (_HighlightType highlight in _highlights.Keys.ToList()) {
                 _highlights[highlight]?.dispose();
                 _highlights[highlight] = null;
             }

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

             this.height = height;
             this.enableFeedback = enableFeedback;
             this.child = child;
+            this.autofocus = autofocus;
         }
 
         public readonly VoidCallback onPressed;
 
             return new RawMaterialButton(
                 onPressed: onPressed,
-                onLongPress:() => onLongPress(),
+                onLongPress:() => onLongPress?.Invoke(),
                 enableFeedback: enableFeedback?? true,
                 onHighlightChanged: onHighlightChanged,
                 fillColor: buttonTheme.getFillColor(this),

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

             this.fabMoveAnimation = fabMoveAnimation;
             this.fabMotionAnimator = fabMotionAnimator;
             this.geometryNotifier = geometryNotifier;
+            this.currentController = currentController;
         }
 
         public readonly Widget child;

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

         }
 
         public abstract Size getPreferredSize(
-            bool? isEnabled,
-            bool? isDiscrete,
+            bool isEnabled,
+            bool isDiscrete,
             TextPainter textPainter = null);
 
         public abstract void paint(
             Animation<float> enableAnimation = null,
-            bool? isDiscrete = null,
+            bool isDiscrete = false,
             TextPainter labelPainter = null,
             RenderBox parentBox = null,
             SliderThemeData sliderTheme = null,
 
         public abstract Size getPreferredSize(
             SliderThemeData sliderTheme = null,
-            bool? isEnabled = null);
+            bool isEnabled = false);
 
         public abstract void paint(
             PaintingContext context,
             Animation<float> enableAnimation = null,
             Offset thumbCenter = null,
-            bool? isEnabled = null,
+            bool isEnabled = false,
             TextDirection? textDirection = null);
 
         public static readonly SliderTickMarkShape noTickMark = new _EmptySliderTickMarkShape();
             RenderBox parentBox = null,
             Offset offset = null,
             SliderThemeData sliderTheme = null,
-            bool? isEnabled = null,
-            bool? isDiscrete = null);
+            bool isEnabled = false,
+            bool isDiscrete = false);
 
         public abstract void paint(
             PaintingContext context,
             Animation<float> enableAnimation = null,
             Offset thumbCenter = null,
-            bool? isEnabled = null,
-            bool? isDiscrete = null,
+            bool isEnabled = false,
+            bool isDiscrete = false,
             TextDirection? textDirection = null
         );
     }
         }
 
-        public abstract Size getPreferredSize(bool? isEnabled, bool? isDiscrete);
+        public abstract Size getPreferredSize(bool isEnabled, bool isDiscrete);
 
         public abstract void paint(
             PaintingContext context,
-            bool? isDiscrete = null,
-            bool? isEnabled = null,
+            bool isDiscrete = false,
+            bool isEnabled = false,
             bool? isOnTop = null,
             TextDirection? textDirection = null,
             SliderThemeData sliderTheme = null,
             Offset center,
             Animation<float> activationAnimation = null,
             Animation<float> enableAnimation = null,
-            bool? isDiscrete = null,
+            bool isDiscrete = false,
             bool? isOnTop = null,
             TextPainter labelPainter = null,
             RenderBox parentBox = null,
 
         public abstract Size getPreferredSize(
             SliderThemeData sliderTheme = null,
-            bool? isEnabled = null
+            bool isEnabled = false
         );
 
         public abstract void paint(
             Animation<float> enableAnimation = null,
             Offset startThumbCenter = null,
             Offset endThumbCenter = null,
-            bool? isEnabled = null,
+            bool isEnabled = false,
             TextDirection? textDirection = null
         );
     }
             RenderBox parentBox = null,
             Offset offset = null,
             SliderThemeData sliderTheme = null,
-            bool? isEnabled = null,
-            bool? isDiscrete = null
+            bool isEnabled = false,
+            bool isDiscrete = false
         );
 
         public abstract void paint(
             Animation<float> enableAnimation = null,
             Offset startThumbCenter = null,
             Offset endThumbCenter = null,
-            bool? isEnabled = null,
-            bool? isDiscrete = null,
+            bool isEnabled = false,
+            bool isDiscrete = false,
             TextDirection? textDirection = null
         );
     }
             RenderBox parentBox = null,
             Offset offset = null,
             SliderThemeData sliderTheme = null,
-            bool? isEnabled = null,
-            bool? isDiscrete = null) {
+            bool isEnabled = false,
+            bool isDiscrete = false) {
-
-            D.assert(isEnabled != null);
-            D.assert(isDiscrete != null);
+            
             D.assert(parentBox != null);
             D.assert(sliderTheme != null);
             float thumbWidth = sliderTheme.thumbShape.getPreferredSize(isEnabled, isDiscrete).width;
             SliderThemeData sliderTheme = null,
             Animation<float> enableAnimation = null,
             Offset thumbCenter = null,
-            bool? isEnabled = false,
-            bool? isDiscrete = false,
+            bool isEnabled = false,
+            bool isDiscrete = false,
             TextDirection? textDirection = null) {
             D.assert(context != null);
             D.assert(offset != null);
             D.assert(enableAnimation != null);
             D.assert(textDirection != null);
             D.assert(thumbCenter != null);
-            D.assert(isEnabled != null);
-            D.assert(isDiscrete != null);
 
             if (sliderTheme.trackHeight == 0) {
                 return;
             RenderBox parentBox = null,
             Offset offset = null,
             SliderThemeData sliderTheme = null,
-            bool? isEnabled = null,
-            bool? isDiscrete = null) {
+            bool isEnabled = false,
+            bool isDiscrete = false) {
-            D.assert(isEnabled != null);
-            D.assert(isDiscrete != null);
             D.assert(parentBox != null);
             D.assert(sliderTheme != null);
             float thumbWidth = sliderTheme.thumbShape.getPreferredSize(isEnabled, isDiscrete).width;
             SliderThemeData sliderTheme = null,
             Animation<float> enableAnimation = null,
             Offset thumbCenter = null,
-            bool? isEnabled = false,
-            bool? isDiscrete = false,
+            bool isEnabled = false,
+            bool isDiscrete = false,
             TextDirection? textDirection = null) {
             D.assert(context != null);
             D.assert(offset != null);
             RenderBox parentBox = null,
             Offset offset = null,
             SliderThemeData sliderTheme = null,
-            bool? isEnabled = false,
-            bool? isDiscrete = false
+            bool isEnabled = false,
+            bool isDiscrete = false
         ) {
             offset = offset ?? Offset.zero;
 
             D.assert(sliderTheme.overlayShape != null);
-            D.assert(isEnabled != null);
-            D.assert(isDiscrete != null);
+
 
             float overlayWidth = sliderTheme.overlayShape.getPreferredSize(isEnabled, isDiscrete).width;
             float trackHeight = sliderTheme.trackHeight.Value;
             Animation<float> enableAnimation = null,
             Offset startThumbCenter = null,
             Offset endThumbCenter = null,
-            bool? isEnabled = false,
-            bool? isDiscrete = false,
+            bool isEnabled = false,
+            bool isDiscrete = false,
             TextDirection? textDirection = null
         ) {
             D.assert(context != null);
             D.assert(enableAnimation != null);
             D.assert(startThumbCenter != null);
             D.assert(endThumbCenter != null);
-            D.assert(isEnabled != null);
-            D.assert(isDiscrete != null);
             D.assert(textDirection != null);
 
             ColorTween activeTrackColorTween = new ColorTween(begin: sliderTheme.disabledActiveTrackColor,
             RenderBox parentBox = null,
             Offset offset = null,
             SliderThemeData sliderTheme = null,
-            bool? isEnabled = false,
-            bool? isDiscrete = false
+            bool isEnabled = false,
+            bool isDiscrete = false
         ) {
             offset = offset ?? Offset.zero;
 
             D.assert(sliderTheme.overlayShape != null);
             D.assert(sliderTheme.trackHeight != null);
-            D.assert(isEnabled != null);
-            D.assert(isDiscrete != null);
 
             float overlayWidth = sliderTheme.overlayShape.getPreferredSize(isEnabled, isDiscrete).width;
             float trackHeight = sliderTheme.trackHeight.Value;
             Animation<float> enableAnimation = null,
             Offset startThumbCenter = null,
             Offset endThumbCenter = null,
-            bool? isEnabled = false,
-            bool? isDiscrete = false,
+            bool isEnabled = false,
+            bool isDiscrete = false,
             TextDirection? textDirection = null
         ) {
             D.assert(context != null);
             D.assert(enableAnimation != null);
             D.assert(startThumbCenter != null);
             D.assert(endThumbCenter != null);
-            D.assert(isEnabled != null);
-            D.assert(isDiscrete != null);
             D.assert(textDirection != null);
 
             ColorTween activeTrackColorTween = new ColorTween(begin: sliderTheme.disabledActiveTrackColor,
 
         public override Size getPreferredSize(
             SliderThemeData sliderTheme = null,
-            bool? isEnabled = null
+            bool isEnabled = false
-            D.assert(isEnabled != null);
             return Size.fromRadius(tickMarkRadius ?? sliderTheme.trackHeight.Value / 2f);
         }
 
             SliderThemeData sliderTheme = null,
             Animation<float> enableAnimation = null,
             Offset thumbCenter = null,
-            bool? isEnabled = null,
+            bool isEnabled = false,
             TextDirection? textDirection = null
         ) {
             D.assert(context != null);
             D.assert(enableAnimation != null);
             D.assert(textDirection != null);
             D.assert(thumbCenter != null);
-            D.assert(isEnabled != null);
 
             Color begin = null;
             Color end = null;
 
         public override Size getPreferredSize(
             SliderThemeData sliderTheme = null,
-            bool? isEnabled = false
+            bool isEnabled = false
-            D.assert(isEnabled != null);
 
             return Size.fromRadius(tickMarkRadius ?? sliderTheme.trackHeight.Value / 2f);
         }
             Animation<float> enableAnimation = null,
             Offset startThumbCenter = null,
             Offset endThumbCenter = null,
-            bool? isEnabled = false,
+            bool isEnabled = false,
             TextDirection? textDirection = null
         ) {
             D.assert(context != null);
             D.assert(enableAnimation != null);
             D.assert(startThumbCenter != null);
             D.assert(endThumbCenter != null);
-            D.assert(isEnabled != null);
             D.assert(textDirection != null);
 
             bool isBetweenThumbs = false;
     class _EmptySliderTickMarkShape : SliderTickMarkShape {
         public override Size getPreferredSize(
             SliderThemeData sliderTheme = null,
-            bool? isEnabled = null) {
+            bool isEnabled = false) {
             return Size.zero;
         }
 
             SliderThemeData sliderTheme = null,
             Animation<float> enableAnimation = null,
             Offset thumbCenter = null,
-            bool? isEnabled = null,
+            bool isEnabled = false,
             TextDirection? textDirection = null) {
         }
     }
-            bool? isEnabled = null,
-            bool? isDiscrete = null,
+            bool isEnabled = false,
+            bool isDiscrete = false,
             TextPainter textPainter = null) {
             return Size.zero;
         }
             Offset center,
             Animation<float> activationAnimation = null,
             Animation<float> enableAnimation = null,
-            bool? isDiscrete = null,
+            bool isDiscrete = false,
             TextPainter labelPainter = null,
             RenderBox parentBox = null,
             SliderThemeData sliderTheme = null,
         }
 
 
-        public override Size getPreferredSize(bool? isEnabled, bool? isDiscrete, TextPainter textPainter = null) {
+        public override Size getPreferredSize(bool isEnabled, bool isDiscrete, TextPainter textPainter = null) {
             return Size.fromRadius(isEnabled == true ? enabledThumbRadius : _disabledThumbRadius);
         }
 
             Offset center,
             Animation<float> activationAnimation = null,
             Animation<float> enableAnimation = null,
-            bool? isDiscrete = null,
+            bool isDiscrete = false,
             TextPainter labelPainter = null,
             RenderBox parentBox = null,
             SliderThemeData sliderTheme = null,
             get { return disabledThumbRadius ?? enabledThumbRadius; }
         }
 
-        public override Size getPreferredSize(bool? isEnabled, bool? isDiscrete) {
+        public override Size getPreferredSize(bool isEnabled, bool isDiscrete) {
             return Size.fromRadius(isEnabled == true ? enabledThumbRadius : _disabledThumbRadius);
         }
 
             Animation<float> activationAnimation = null,
             Animation<float> enableAnimation = null,
-            bool? isDiscrete = false,
-            bool? isEnabled = false,
+            bool isDiscrete = false,
+            bool isEnabled = false,
             bool? isOnTop = null,
             TextDirection? textDirection = null,
             SliderThemeData sliderTheme = null,
                 bool showValueIndicator = false;
                 switch (sliderTheme.showValueIndicator) {
                     case ShowValueIndicator.onlyForDiscrete:
-                        showValueIndicator = isDiscrete.Value;
+                        showValueIndicator = isDiscrete;
-                        showValueIndicator = !isDiscrete.Value;
+                        showValueIndicator = !isDiscrete;
                         break;
                     case ShowValueIndicator.always:
                         showValueIndicator = true;
 
         public readonly float overlayRadius;
 
-        public override Size getPreferredSize(bool? isEnabled, bool? isDiscrete, TextPainter textPainter = null) {
+        public override Size getPreferredSize(bool isEnabled, bool isDiscrete, TextPainter textPainter = null) {
             return Size.fromRadius(overlayRadius);
         }
 
             Animation<float> activationAnimation = null,
             Animation<float> enableAnimation = null,
-            bool? isDiscrete = null,
+            bool isDiscrete = false,
             TextPainter labelPainter = null,
             RenderBox parentBox = null,
             SliderThemeData sliderTheme = null,
         static readonly _PaddleSliderTrackShapePathPainter _pathPainter = new _PaddleSliderTrackShapePathPainter();
 
         public override Size getPreferredSize(
-            bool? isEnabled,
-            bool? isDiscrete,
+            bool isEnabled,
+            bool isDiscrete,
             TextPainter labelPainter = null) {
             D.assert(labelPainter != null);
             return _pathPainter.getPreferredSize(isEnabled, isDiscrete, labelPainter);
             Offset center,
             Animation<float> activationAnimation = null,
             Animation<float> enableAnimation = null,
-            bool? isDiscrete = null,
+            bool isDiscrete = false,
             TextPainter labelPainter = null,
             RenderBox parentBox = null,
             SliderThemeData sliderTheme = null,
             Offset center,
             Animation<float> activationAnimation = null,
             Animation<float> enableAnimation = null,
-            bool? isDiscrete = null,
+            bool isDiscrete = false,
             bool? isOnTop = null,
             TextPainter labelPainter = null,
             RenderBox parentBox = null,
         const bool _debuggingLabelLocation = false;
 
         public Size getPreferredSize(
-            bool? isEnabled,
-            bool? isDiscrete,
+            bool isEnabled,
+            bool isDiscrete,
             TextPainter labelPainter
         ) {
             D.assert(labelPainter != null);

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

     public class ThemeData : Diagnosticable, IEquatable<ThemeData> {
         public ThemeData(
             Brightness? brightness = null,
+            VisualDensity visualDensity = null,
             MaterialColor primarySwatch = null,
             Color primaryColor = null,
             Brightness? primaryColorBrightness = null,
             ChipThemeData chipTheme = null,
             RuntimePlatform? platform = null,
             MaterialTapTargetSize? materialTapTargetSize = null,
+            bool? applyElevationOverlayColor = null,
             PageTransitionsTheme pageTransitionsTheme = null,
             AppBarTheme appBarTheme = null,
             BottomAppBarTheme bottomAppBarTheme = null,
         ) {
             brightness = brightness ?? Brightness.light;
             bool isDark = brightness == Brightness.dark;
+            visualDensity = visualDensity ?? new VisualDensity();
 
             primarySwatch = primarySwatch ?? Colors.blue;
             primaryColor = primaryColor ?? (isDark ? Colors.grey[900] : primarySwatch);
             TextTheme defaultAccentTextTheme = accentIsDark ? typography.white : typography.black;
             accentTextTheme = defaultAccentTextTheme.merge(accentTextTheme);
             materialTapTargetSize = materialTapTargetSize ?? MaterialTapTargetSize.padded;
+            applyElevationOverlayColor = applyElevationOverlayColor ?? false;
+            
             if (fontFamily != null) {
                 textTheme = textTheme.apply(fontFamily: fontFamily);
                 primaryTextTheme = primaryTextTheme.apply(fontFamily: fontFamily);
             snackBarTheme = snackBarTheme ?? new SnackBarThemeData();
 
             D.assert(brightness != null);
+            D.assert(visualDensity != null);
             D.assert(primaryColor != null);
             D.assert(primaryColorBrightness != null);
             D.assert(primaryColorLight != null);
             D.assert(primaryIconTheme != null);
             D.assert(accentIconTheme != null);
             D.assert(materialTapTargetSize != null);
+            D.assert(applyElevationOverlayColor != null);
             D.assert(pageTransitionsTheme != null);
             D.assert(appBarTheme != null);
             D.assert(bottomAppBarTheme != null);
             D.assert(snackBarTheme != null);
 
             this.brightness = brightness ?? Brightness.light;
+            this.visualDensity = visualDensity;
             this.primaryColor = primaryColor;
             this.primaryColorBrightness = primaryColorBrightness ?? Brightness.light;
             this.primaryColorLight = primaryColorLight;
             this.chipTheme = chipTheme;
             this.platform = platform.Value;
             this.materialTapTargetSize = materialTapTargetSize ?? MaterialTapTargetSize.padded;
+            this.applyElevationOverlayColor = applyElevationOverlayColor.Value;
             this.pageTransitionsTheme = pageTransitionsTheme;
             this.appBarTheme = appBarTheme;
             this.bottomAppBarTheme = bottomAppBarTheme;
 
         public static ThemeData raw(
             Brightness? brightness = null,
+            VisualDensity visualDensity = null,
             Color primaryColor = null,
             Brightness? primaryColorBrightness = null,
             Color primaryColorLight = null,
             ChipThemeData chipTheme = null,
             RuntimePlatform? platform = null,
             MaterialTapTargetSize? materialTapTargetSize = null,
+            bool? applyElevationOverlayColor = null,
             PageTransitionsTheme pageTransitionsTheme = null,
             AppBarTheme appBarTheme = null,
             BottomAppBarTheme bottomAppBarTheme = null,
             SnackBarThemeData snackBarTheme = null
         ) {
             D.assert(brightness != null);
+            D.assert(visualDensity != null);
             D.assert(primaryColor != null);
             D.assert(primaryColorBrightness != null);
             D.assert(primaryColorLight != null);
             D.assert(accentIconTheme != null);
             D.assert(platform != null);
             D.assert(materialTapTargetSize != null);
+            D.assert(applyElevationOverlayColor != null);
             D.assert(pageTransitionsTheme != null);
             D.assert(appBarTheme != null);
             D.assert(bottomAppBarTheme != null);
                 chipTheme: chipTheme,
                 platform: platform,
                 materialTapTargetSize: materialTapTargetSize,
+                applyElevationOverlayColor: applyElevationOverlayColor,
                 pageTransitionsTheme: pageTransitionsTheme,
                 appBarTheme: appBarTheme,
                 bottomAppBarTheme: bottomAppBarTheme,
                 snackBarTheme: snackBarTheme);
         }
 
+        public static ThemeData from(
+            ColorScheme colorScheme,
+            TextTheme textTheme = null
+            ) {
+            D.assert(colorScheme != null);
+            
+            bool isDark = colorScheme.brightness == Brightness.dark;
+            
+            Color primarySurfaceColor = isDark ? colorScheme.surface : colorScheme.primary;
+            Color onPrimarySurfaceColor = isDark ? colorScheme.onSurface : colorScheme.onPrimary;
+
+            return new ThemeData(
+                brightness: colorScheme.brightness,
+                primaryColor: primarySurfaceColor,
+                primaryColorBrightness: ThemeData.estimateBrightnessForColor(primarySurfaceColor),
+                canvasColor: colorScheme.background,
+                accentColor: colorScheme.secondary,
+                accentColorBrightness: ThemeData.estimateBrightnessForColor(colorScheme.secondary),
+                scaffoldBackgroundColor: colorScheme.background,
+                bottomAppBarColor: colorScheme.surface,
+                cardColor: colorScheme.surface,
+                dividerColor: colorScheme.onSurface.withOpacity(0.12f),
+                backgroundColor: colorScheme.background,
+                dialogBackgroundColor: colorScheme.background,
+                errorColor: colorScheme.error,
+                textTheme: textTheme,
+                indicatorColor: onPrimarySurfaceColor,
+                applyElevationOverlayColor: isDark,
+                colorScheme: colorScheme
+            );
+        }
+
         public static ThemeData light() {
             return new ThemeData(brightness: Brightness.light);
         }
 
         public ThemeData copyWith(
             Brightness? brightness = null,
+            VisualDensity visualDensity = null,
             Color primaryColor = null,
             Brightness? primaryColorBrightness = null,
             Color primaryColorLight = null,
             ChipThemeData chipTheme = null,
             RuntimePlatform? platform = null,
             MaterialTapTargetSize? materialTapTargetSize = null,
+            bool? applyElevationOverlayColor = null,
             PageTransitionsTheme pageTransitionsTheme = null,
             AppBarTheme appBarTheme = null,
             BottomAppBarTheme bottomAppBarTheme = null,
         ) {
             return raw(
                 brightness: brightness ?? this.brightness,
+                visualDensity: visualDensity ?? this.visualDensity,
                 primaryColor: primaryColor ?? this.primaryColor,
                 primaryColorBrightness: primaryColorBrightness ?? this.primaryColorBrightness,
                 primaryColorLight: primaryColorLight ?? this.primaryColorLight,
                 chipTheme: chipTheme ?? this.chipTheme,
                 platform: platform ?? this.platform,
                 materialTapTargetSize: materialTapTargetSize ?? this.materialTapTargetSize,
+                applyElevationOverlayColor: applyElevationOverlayColor ?? this.applyElevationOverlayColor,
                 pageTransitionsTheme: pageTransitionsTheme ?? this.pageTransitionsTheme,
                 appBarTheme: appBarTheme ?? this.appBarTheme,
                 bottomAppBarTheme: bottomAppBarTheme ?? this.bottomAppBarTheme,
             D.assert(b != null);
             return raw(
                 brightness: t < 0.5 ? a.brightness : b.brightness,
+                visualDensity: VisualDensity.lerp(a.visualDensity, b.visualDensity, t),
                 primaryColor: Color.lerp(a.primaryColor, b.primaryColor, t),
                 primaryColorBrightness: t < 0.5 ? a.primaryColorBrightness : b.primaryColorBrightness,
                 primaryColorLight: Color.lerp(a.primaryColorLight, b.primaryColorLight, t),
                 chipTheme: ChipThemeData.lerp(a.chipTheme, b.chipTheme, t),
                 platform: t < 0.5 ? a.platform : b.platform,
                 materialTapTargetSize: t < 0.5 ? a.materialTapTargetSize : b.materialTapTargetSize,
+                applyElevationOverlayColor: t < 0.5 ? a.applyElevationOverlayColor : b.applyElevationOverlayColor,
                 pageTransitionsTheme: t < 0.5 ? a.pageTransitionsTheme : b.pageTransitionsTheme,
                 appBarTheme: AppBarTheme.lerp(a.appBarTheme, b.appBarTheme, t),
                 bottomAppBarTheme: BottomAppBarTheme.lerp(a.bottomAppBarTheme, b.bottomAppBarTheme, t),
             }
 
             return other.brightness == brightness &&
+                   other.visualDensity == visualDensity && 
                    other.primaryColor == primaryColor &&
                    other.primaryColorBrightness == primaryColorBrightness &&
                    other.primaryColorLight == primaryColorLight &&
                    other.chipTheme == chipTheme &&
                    other.platform == platform &&
                    other.materialTapTargetSize == materialTapTargetSize &&
+                   other.applyElevationOverlayColor == applyElevationOverlayColor &&
                    other.pageTransitionsTheme == pageTransitionsTheme &&
                    other.appBarTheme == appBarTheme &&
                    other.bottomAppBarTheme == bottomAppBarTheme &&
 
             unchecked {
                 var hashCode = brightness.GetHashCode();
+                hashCode = (hashCode * 397) ^ visualDensity.GetHashCode();
                 hashCode = (hashCode * 397) ^ primaryColor.GetHashCode();
                 hashCode = (hashCode * 397) ^ primaryColorBrightness.GetHashCode();
                 hashCode = (hashCode * 397) ^ primaryColorLight.GetHashCode();
                 hashCode = (hashCode * 397) ^ chipTheme.GetHashCode();
                 hashCode = (hashCode * 397) ^ platform.GetHashCode();
                 hashCode = (hashCode * 397) ^ materialTapTargetSize.GetHashCode();
+                hashCode = (hashCode * 397) ^ applyElevationOverlayColor.GetHashCode();
                 hashCode = (hashCode * 397) ^ pageTransitionsTheme.GetHashCode();
                 hashCode = (hashCode * 397) ^ appBarTheme.GetHashCode();
                 hashCode = (hashCode * 397) ^ bottomAppBarTheme.GetHashCode();
             properties.add(new DiagnosticsProperty<ChipThemeData>("chipTheme", chipTheme));
             properties.add(
                 new DiagnosticsProperty<MaterialTapTargetSize>("materialTapTargetSize", materialTapTargetSize));
+            properties.add(new DiagnosticsProperty<bool>("applyElevationOverlayColor", applyElevationOverlayColor, level: DiagnosticLevel.debug));
             properties.add(
                 new DiagnosticsProperty<PageTransitionsTheme>("pageTransitionsTheme", pageTransitionsTheme));
             properties.add(new DiagnosticsProperty<AppBarTheme>("appBarTheme", appBarTheme));
             }
         }
 
-        static VisualDensity lerp(VisualDensity a, VisualDensity b, float t) {
+        internal static VisualDensity lerp(VisualDensity a, VisualDensity b, float t) {
             return new VisualDensity(
                 horizontal: Mathf.Lerp(a.horizontal, b.horizontal, t),
                 vertical: Mathf.Lerp(a.horizontal, b.horizontal, t)
         }
 
         public static bool operator !=(VisualDensity self, object other) {
-            return Equals(self, other);
+            return !Equals(self, other);
         }
 
         public bool Equals(VisualDensity other) {

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

               );
             }
 
-            height = widget.height ?? tooltipTheme.height ?? _defaultTooltipHeight;
-            padding = widget.padding ?? tooltipTheme.padding ?? _defaultPadding;
-            margin = widget.margin ?? tooltipTheme.margin ?? _defaultMargin;
-            verticalOffset = widget.verticalOffset ?? tooltipTheme.verticalOffset ?? _defaultVerticalOffset;
-            preferBelow = widget.preferBelow ?? tooltipTheme.preferBelow ?? _defaultPreferBelow;
-            excludeFromSemantics = widget.excludeFromSemantics ?? tooltipTheme.excludeFromSemantics ?? _defaultExcludeFromSemantics;
-            decoration = widget.decoration ?? tooltipTheme.decoration ?? defaultDecoration;
-            textStyle = widget.textStyle ?? tooltipTheme.textStyle ?? defaultTextStyle;
-            waitDuration = widget.waitDuration ?? tooltipTheme.waitDuration ?? _defaultWaitDuration;
-            showDuration = widget.showDuration ?? tooltipTheme.showDuration ?? _defaultShowDuration;
+            height = widget.height ?? tooltipTheme?.height ?? _defaultTooltipHeight;
+            padding = widget.padding ?? tooltipTheme?.padding ?? _defaultPadding;
+            margin = widget.margin ?? tooltipTheme?.margin ?? _defaultMargin;
+            verticalOffset = widget.verticalOffset ?? tooltipTheme?.verticalOffset ?? _defaultVerticalOffset;
+            preferBelow = widget.preferBelow ?? tooltipTheme?.preferBelow ?? _defaultPreferBelow;
+            excludeFromSemantics = widget.excludeFromSemantics ?? tooltipTheme?.excludeFromSemantics ?? _defaultExcludeFromSemantics;
+            decoration = widget.decoration ?? tooltipTheme?.decoration ?? defaultDecoration;
+            textStyle = widget.textStyle ?? tooltipTheme?.textStyle ?? defaultTextStyle;
+            waitDuration = widget.waitDuration ?? tooltipTheme?.waitDuration ?? _defaultWaitDuration;
+            showDuration = widget.showDuration ?? tooltipTheme?.showDuration ?? _defaultShowDuration;
 
             Widget result = new GestureDetector(
               behavior: HitTestBehavior.opaque,

com.unity.uiwidgets/Runtime/painting/border_radius.cs

         }
 
         public static bool operator !=(BorderRadiusGeometry left, BorderRadiusGeometry right) {
-            return Equals(left, right);
+            return !Equals(left, right);
         }
 
         public bool Equals(BorderRadiusGeometry other) {

com.unity.uiwidgets/Runtime/rendering/layer.cs

             canvas.drawPath(child.clipPath, new Paint() {
                 color = new Color(0xFFAA0000),
                 style = PaintingStyle.stroke,
-                strokeWidth = child.elevation + 10.0f,
+                strokeWidth = child.elevation.Value + 10.0f,
             });
             PictureLayer pictureLayer = new PictureLayer(child.clipPath.getBounds());
             pictureLayer.picture = recorder.endRecording();
                 D.assert(physicalModelLayer.lastChild?.debugCreator != physicalModelLayer,
                     () => "debugCheckElevations has either already visited this layer or failed to remove the" +
                           " added picture from it.");
-                float accumulatedElevation = physicalModelLayer.elevation;
+                float accumulatedElevation = physicalModelLayer.elevation.Value;
-                        accumulatedElevation += modelLayer.elevation;
+                        accumulatedElevation += modelLayer.elevation.Value;
                     }
 
                     ancestor = ancestor.parent;
                     PhysicalModelLayer predecessor = physicalModelLayers[j];
-                    float predecessorAccumulatedElevation = predecessor.elevation;
+                    float predecessorAccumulatedElevation = predecessor.elevation.Value;
                     ancestor = predecessor.parent;
                     while (ancestor != null) {
                         if (ancestor == predecessor) {
                         if (ancestor is PhysicalModelLayer modelLayer) {
-                            predecessorAccumulatedElevation += modelLayer.elevation;
+                            predecessorAccumulatedElevation += modelLayer.elevation.Value;
                         }
 
                         ancestor = ancestor.parent;
             float? elevation = null,
             Color color = null,
             Color shadowColor = null) {
-            D.assert(clipPath != null);
-            D.assert(elevation != null);
-            D.assert(color != null);
-            D.assert(shadowColor != null);
-            _elevation = elevation.Value;
+            _elevation = elevation;
             _color = color;
             this.shadowColor = shadowColor;
         }
         }
         Clip _clipBehavior;
 
-        public float elevation {
+        public float? elevation {
             get { return _elevation; }
             set {
                 if (value != _elevation) {
             }
         }
-        float _elevation;
+        float? _elevation;
 
         public Color color {
             get { return _color; }
             layerOffset = layerOffset ?? Offset.zero;
             
             D.assert(clipPath != null);
-            D.assert(clipBehavior != null);
+            D.assert(color != null);
-            D.assert(color != null);
             D.assert(shadowColor != null);
 
             bool enabled = true;
             if (enabled) {
                 engineLayer = builder.pushPhysicalShape(
                     path: layerOffset == Offset.zero ? clipPath : clipPath.shift(layerOffset),
-                    elevation: elevation,
+                    elevation: elevation.Value,
                     color: color,
                     shadowColor: shadowColor,
                     clipBehavior: clipBehavior,

com.unity.uiwidgets/Runtime/rendering/viewport.cs

             AxisDirection axisDirection = AxisDirection.down,
             AxisDirection crossAxisDirection = AxisDirection.right,
             ViewportOffset offset = null,
-            float cacheExtent = RenderViewportUtils.defaultCacheExtent,
+            float? cacheExtent = null,
-            D.assert(cacheExtentStyle == CacheExtentStyle.pixel);
+            D.assert(cacheExtent != null || cacheExtentStyle == CacheExtentStyle.pixel);
-            _cacheExtent = cacheExtent;
+            _cacheExtent = cacheExtent ?? RenderViewportUtils.defaultCacheExtent;
             _cacheExtentStyle = cacheExtentStyle;
         }
 

com.unity.uiwidgets/Runtime/services/text_input.cs

             TextRange composing = null) {
             selection = selection ?? TextSelection.collapsed(offset: -1);
             D.assert(text != null);
-            D.assert(selection != null);
             this.text = text;
             this.composing = composing ?? TextRange.empty;
 

com.unity.uiwidgets/Runtime/widgets/automatic_keep_alive.cs

             handle.addListener(_handles[handle]);
             if (!_keepingAlive) {
                 _keepingAlive = true;
-                ParentDataElement<KeepAliveParentDataMixin> childElement = _getChildElement();
+                ParentDataElement childElement = _getChildElement();
                 if (childElement != null) {
                     _updateParentDataOfChild(childElement);
                 }
                             return;
                         }
-                        ParentDataElement<KeepAliveParentDataMixin> childElement1 = _getChildElement();
+                        ParentDataElement childElement1 = _getChildElement();
                         D.assert(childElement1 != null);
                         _updateParentDataOfChild(childElement1);
                     });
             return false;
         }
         
-        ParentDataElement<KeepAliveParentDataMixin> _getChildElement() {
+        ParentDataElement _getChildElement() {
-            D.assert(childElement == null || childElement is ParentDataElement<KeepAliveParentDataMixin>);
-            return (ParentDataElement<KeepAliveParentDataMixin>) childElement;
+            D.assert(childElement == null || childElement is ParentDataElement);
+            return (ParentDataElement) childElement;
-       void _updateParentDataOfChild(ParentDataElement<KeepAliveParentDataMixin> childElement) {
-           childElement.applyWidgetOutOfTurn((ParentDataWidget<KeepAliveParentDataMixin>) build(context));
+       void _updateParentDataOfChild(ParentDataElement childElement) {
+           childElement.applyWidgetOutOfTurn((ParentDataWidget) build(context));
        }
 
         VoidCallback _createCallback(Listenable handle) {

com.unity.uiwidgets/Runtime/widgets/editable_text.cs

                 "minLines and maxLines must be null when expands is true."
             );
             D.assert(!obscureText || maxLines == 1, () => "Obscured fields cannot be multiline.");
+            
+            scrollPadding = scrollPadding ?? EdgeInsets.all(20.0f);
             D.assert(scrollPadding != null);
             toolbarOptions = toolbarOptions ?? new ToolbarOptions(
                 copy: true,
                     inputFormatters.Add(formatter);
                 }
             }
+            showCursor = showCursor ?? !readOnly;
+
-            this.showCursor = !readOnly;
-            this.scrollPadding = scrollPadding ?? EdgeInsets.all(20.0f);
+            this.scrollPadding = scrollPadding;
             this.controller = controller;
             this.focusNode = focusNode;
             this.obscureText = obscureText;
             this.smartQuotesType = smartQuotesType.Value;
-            this.showCursor = showCursor;
+            this.showCursor = showCursor.Value;
             this.textWidthBasis = textWidthBasis;
             this.onSelectionHandleTapped = onSelectionHandleTapped;
             this.scrollController = scrollController;
         public readonly TextWidthBasis textWidthBasis;
         public readonly VoidCallback onSelectionHandleTapped;
         public readonly ScrollController scrollController;
-        public readonly bool? showCursor;
+        public readonly bool showCursor;
         public readonly ui.BoxHeightStyle selectionHeightStyle;
         public readonly ui.BoxWidthStyle selectionWidthStyle;
         public readonly bool forceLine;
             _cursorBlinkOpacityController.addListener(_onCursorColorTick);
             _floatingCursorResetController = new AnimationController(vsync: this);
             _floatingCursorResetController.addListener(_onFloatingCursorResetTick);
-            _cursorVisibilityNotifier.value = widget.showCursor ?? false;
+            _cursorVisibilityNotifier.value = widget.showCursor;
         }
 
         public override void didChangeDependencies() {
             if (widget.controller.selection != oldWidget.controller.selection) {
                 _selectionOverlay?.update(_value);
             }
-            _selectionOverlay.handlesVisible = widget.showSelectionHandles;
+
+            if (_selectionOverlay != null) {
+                _selectionOverlay.handlesVisible = widget.showSelectionHandles;
+            }
+
             if (widget.focusNode != oldWidget.focusNode) {
                 oldWidget.focusNode.removeListener(_handleFocusChanged);
                 _focusAttachment?.detach();
                         fontFamily: style.fontFamily,
                         fontSize: style.fontSize,
                         fontWeight: style.fontWeight,
-                        textDirection: (TextDirection)_textDirection,
+                        textDirection: _textDirection.Value,
                         textAlign: widget.textAlign
                     );
                 }
         void _onCursorColorTick() {
             renderEditable.cursorColor =
                 widget.cursorColor.withOpacity(_cursorBlinkOpacityController.value);
-            _cursorVisibilityNotifier.value = widget.showCursor.Value && _cursorBlinkOpacityController.value > 0;
+            _cursorVisibilityNotifier.value = widget.showCursor && _cursorBlinkOpacityController.value > 0;
         }
 
         public bool cursorCurrentlyVisible {
                               cursorColor: _cursorColor,
                               backgroundCursorColor: widget.backgroundCursorColor,
                               showCursor: EditableText.debugDeterministicCursor
-                                  ? new ValueNotifier<bool>(widget.showCursor ?? false)
+                                  ? new ValueNotifier<bool>(widget.showCursor)
                                   : _cursorVisibilityNotifier,
                               forceLine: widget.forceLine,
                               readOnly: widget.readOnly,

com.unity.uiwidgets/Runtime/widgets/framework.cs

                     hasSameSuperclass = oldElementClass == newWidgetClass;
                     return true;
                 });
-                if (hasSameSuperclass && child.widget == newWidget) {
-                    if (child.slot != newSlot) {
+                if (hasSameSuperclass && Equals(child.widget,newWidget)) {
+                    if (!Equals(child.slot, newSlot)) {
                         updateSlotForChild(child, newSlot);
                     }
 
-                    if (child.slot != newSlot) {
+                    if (!Equals(child.slot, newSlot)) {
-                    D.assert(child.widget == newWidget);
+                    D.assert(Equals(child.widget, newWidget));
                     D.assert(() => {
                         child.owner._debugElementWasRebuilt(child);
                         return true;
         }
     }
 
-    public class ParentDataElement<T> : ParentDataElement where T : ParentData {
+    public class ParentDataElement<T> : ParentDataElement where T : IParentData {
         public ParentDataElement(ParentDataWidget<T> widget) : base(widget)
         {
         }
                     ((RenderObjectElement) child)._updateParentData(widget);
                 }
                 else {
-                    D.assert(!(child is ParentDataElement<ParentData>));
+                    D.assert(!(child is ParentDataElement<IParentData>));
                     child.visitChildren(applyParentDataToChild);
                 }
             };

com.unity.uiwidgets/Runtime/widgets/page_view.cs

         }
 
         public override bool applyViewportDimension(float viewportDimension) {
-            float oldViewportDimensions = this.viewportDimension;
+            float oldViewportDimensions = 0.0f;
+            if (haveDimensions) {
+                oldViewportDimensions = this.viewportDimension;
+            }
+            
             bool result = base.applyViewportDimension(viewportDimension);
             float? oldPixels = null;
             if (havePixels) {

Samples/UIWidgetsSamples_2019_4/Assets/StreamingAssets/MaterialIcons-Regular.ttf

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Samples/UIWidgetsSamples_2019_4/Assets/StreamingAssets/MaterialIcons-Regular.ttf.meta

+fileFormatVersion: 2
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+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Samples/UIWidgetsSamples_2019_4/Assets/MaterialSample/BottomAppBarSample.cs

+using System.Collections.Generic;
+using uiwidgets;
+using Unity.UIWidgets.engine2;
+using Unity.UIWidgets.foundation;
+using Unity.UIWidgets.material;
+using Unity.UIWidgets.rendering;
+using Unity.UIWidgets.ui;
+using Unity.UIWidgets.widgets;
+using UnityEngine;
+using Color = Unity.UIWidgets.ui.Color;
+using ui_ = Unity.UIWidgets.widgets.ui_;
+
+namespace UIWidgetsSample {
+    
+    public class BottomAppBarSample : UIWidgetsPanel {
+
+        protected override void main() {
+            ui_.runApp(new MaterialApp(
+                showPerformanceOverlay: false,
+                home: new BottomAppBarWidget()));
+        }
+
+        protected new void OnEnable() {
+            base.OnEnable();
+        }
+    }
+    
+    public class BottomAppBarWidget : StatelessWidget {
+        public BottomAppBarWidget(Key key = null) : base(key) {
+
+        }
+
+        public override Widget build(BuildContext context) {
+            return new Scaffold(
+                backgroundColor: Colors.grey,
+                bottomNavigationBar: new BottomAppBar(
+                    child: new Row(
+                        mainAxisSize: MainAxisSize.max,
+                        mainAxisAlignment: MainAxisAlignment.spaceBetween,
+                        children: new List<Widget> {
+                            new IconButton(icon: new Icon(Unity.UIWidgets.material.Icons.menu), onPressed: () => { }),
+                            new IconButton(icon: new Icon(Unity.UIWidgets.material.Icons.account_balance),
+                                onPressed: () => { })
+                        })));
+        }
+    }
+}

Samples/UIWidgetsSamples_2019_4/Assets/MaterialSample/BottomAppBarSample.cs.meta

+fileFormatVersion: 2
+guid: 8ba2c65db2f2848d3a3fa5eb0890abe5
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
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+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Samples/UIWidgetsSamples_2019_4/Assets/MaterialSample/DividerAndButton.cs

+using System.Collections.Generic;
+using uiwidgets;
+using Unity.UIWidgets.engine;
+using Unity.UIWidgets.engine2;
+using Unity.UIWidgets.foundation;
+using Unity.UIWidgets.material;
+using Unity.UIWidgets.painting;
+using Unity.UIWidgets.ui;
+using Unity.UIWidgets.widgets;
+using TextStyle = Unity.UIWidgets.painting.TextStyle;
+using ui_ = Unity.UIWidgets.widgets.ui_;
+
+namespace UIWidgetsSample {
+    public class DividerAndButton : UIWidgetsPanel {
+        
+        protected override void main() {
+            ui_.runApp(new MyApp());
+        }
+        
+        class MyApp : StatelessWidget
+        {
+            public override Widget build(BuildContext context)
+            {
+                return new MaterialApp(
+                    home: new DividerAndButtonSample()
+                );
+            }
+        }
+        
+        public class DividerAndButtonSample : StatefulWidget {
+            public DividerAndButtonSample(Key key = null) : base(key) {
+            }
+
+            public override State createState() {
+                return new _DividerAndButtonState();
+            }
+        }
+
+        public class _DividerAndButtonState : State<DividerAndButtonSample> {
+            string title = "Hello";
+            string subtitle = "World";
+            TextEditingController controller = new TextEditingController("xxxxxx");
+
+            public override Widget build(BuildContext context) {
+                return new DividerTheme(
+                    data: new DividerThemeData(
+                    ),
+                    child: new Container(
+                    height: 200,
+                    padding: EdgeInsets.all(10),
+                    decoration: new BoxDecoration(
+                        color: new Color(0xFFEF1F7F),
+                        border: Border.all(color: Color.fromARGB(255, 0xDF, 0x10, 0x70), width: 5),
+                        borderRadius: BorderRadius.all(20)
+                    ),
+                    child: new Center(
+                        child: new Column(
+                            children: new List<Widget>() {
+                                new Text(this.title),
+                                new Divider(),
+                                new Text(this.subtitle),
+                                new Divider(),
+                                new Container(
+                                    width: 500,
+                                    decoration: new BoxDecoration(border: Border.all(new Color(0xFF00FF00), 1)),
+                                    child: new EditableText(
+                                        controller: this.controller,
+                                        focusNode: new FocusNode(),
+                                        style: new TextStyle(
+                                            fontSize: 18,
+                                            height: 1.5f,
+                                            color: new Color(0xFFFF89FD)),
+                                        cursorColor: Color.fromARGB(255, 0, 0, 0),
+                                        backgroundCursorColor: Colors.grey
+                                    )
+                                ),
+                                new Divider(),
+                                new ButtonBar(
+                                    children: new List<Widget> {
+                                        new FlatButton(
+                                            onPressed: () => {
+                                                this.setState(() => { this.title = this.controller.text; });
+                                            },
+                                            padding: EdgeInsets.all(5.0f),
+                                            child: new Center(
+                                                child: new Text("Set Title")
+                                            )
+                                        ),
+                                        new RaisedButton(
+                                            onPressed: () => {
+                                                this.setState(() => { this.subtitle = this.controller.text; });
+                                            },
+                                            padding: EdgeInsets.all(5.0f),
+                                            child: new Center(
+                                                child: new Text("Set Subtitle")
+                                            )
+                                        )
+                                    }
+                                )
+                            }
+                        )
+                    )
+                ));
+            }
+        }
+    }
+}

Samples/UIWidgetsSamples_2019_4/Assets/MaterialSample/DividerAndButton.cs.meta

+fileFormatVersion: 2
+guid: 7d02ebc8543484a84b26e073e5ec501f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Samples/UIWidgetsSamples_2019_4/Assets/MaterialSample/MaterialAppBarSample.cs

+using System.Collections.Generic;
+using uiwidgets;
+using Unity.UIWidgets.engine2;
+using Unity.UIWidgets.foundation;
+using Unity.UIWidgets.material;
+using Unity.UIWidgets.painting;
+using Unity.UIWidgets.rendering;
+using Unity.UIWidgets.ui;
+using Unity.UIWidgets.widgets;
+using UnityEngine;
+using TextStyle = Unity.UIWidgets.painting.TextStyle;
+using ui_ = Unity.UIWidgets.widgets.ui_;
+
+namespace UIWidgetsSample {
+    
+    public class MaterialAppBarSample : UIWidgetsPanel {
+
+        protected override void main() {
+            ui_.runApp(new MaterialApp(
+                showPerformanceOverlay: false,
+                home: new MaterialAppBarWidget()));
+        }
+
+        protected new void OnEnable() {
+            base.OnEnable();
+        }
+    }
+    
+    public class MaterialAppBarWidget : StatefulWidget {
+        public MaterialAppBarWidget(Key key = null) : base(key) {
+        }
+
+        public override State createState() {
+            return new MaterialAppBarWidgetState();
+        }
+    }
+
+    public class MaterialAppBarWidgetState : State<MaterialAppBarWidget> {
+        Choice _selectedChoice = Choice.choices[0];
+
+        GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>.key();
+
+        VoidCallback _showBottomSheetCallback;
+
+        public override void initState() {
+            base.initState();
+            this._showBottomSheetCallback = this._showBottomSheet;
+        }
+
+        void _showBottomSheet() {
+            this.setState(() => { this._showBottomSheetCallback = null; });
+
+            this._scaffoldKey.currentState.showBottomSheet((BuildContext subContext) => {
+                ThemeData themeData = Theme.of(subContext);
+                return new Container(
+                    decoration: new BoxDecoration(
+                        border: new Border(
+                            top: new BorderSide(
+                                color: themeData.disabledColor))),
+                    child: new Padding(
+                        padding: EdgeInsets.all(32.0f),
+                        child: new Text("This is a Material persistent bottom sheet. Drag downwards to dismiss it.",
+                            textAlign: TextAlign.center,
+                            style: new TextStyle(
+                                color: themeData.accentColor,
+                                fontSize: 16.0f))
+                    )
+                );
+            }).closed.then((object obj) => {
+                if (this.mounted) {
+                    this.setState(() => { this._showBottomSheetCallback = this._showBottomSheet; });
+                }
+            });
+        }
+
+        void _select(Choice choice) {
+            this.setState(() => { this._selectedChoice = choice; });
+        }
+
+        public override Widget build(BuildContext context) {
+            return new Scaffold(
+                key: this._scaffoldKey,
+                appBar: new AppBar(
+                    title: new Text("Basic AppBar"),
+                    actions: new List<Widget> {
+                        new IconButton(
+                            icon: new Icon(Choice.choices[0].icon),
+                            //color: Colors.blue,
+                            onPressed: () => { this._select((Choice.choices[0])); }
+                        ),
+                        new IconButton(
+                            icon: new Icon(Choice.choices[1].icon),
+                            //color: Colors.blue,
+                            onPressed: () => { this._select((Choice.choices[1])); }
+                        ),
+
+                        new PopupMenuButton<Choice>(
+                            onSelected: this._select,
+                            itemBuilder: (BuildContext subContext) => {
+                                List<PopupMenuEntry<Choice>> popupItems = new List<PopupMenuEntry<Choice>>();
+                                for (int i = 2; i < Choice.choices.Count; i++) {
+                                    popupItems.Add(new PopupMenuItem<Choice>(
+                                        value: Choice.choices[i],
+                                        child: new Text(Choice.choices[i].title)));
+                                }
+
+                                return popupItems;
+                            }
+                        )
+                    }
+                ),
+                body: new Padding(
+                    padding: EdgeInsets.all(16.0f),
+                    child: new ChoiceCard(choice: this._selectedChoice)
+                ),
+                floatingActionButton: new FloatingActionButton(
+                    backgroundColor: Colors.redAccent,
+                    child: new Icon(Unity.UIWidgets.material.Icons.add_alert),
+                    onPressed: this._showBottomSheetCallback
+                ),
+                drawer: new Drawer(
+                    child: new ListView(
+                        padding: EdgeInsets.zero,
+                        children: new List<Widget> {
+                            new ListTile(
+                                leading: new Icon(Unity.UIWidgets.material.Icons.account_circle),
+                                title: new Text("Login"),
+                                onTap: () => { }
+                            ),
+                            new Divider(
+                                height: 2.0f),
+                            new ListTile(
+                                leading: new Icon(Unity.UIWidgets.material.Icons.account_balance_wallet),
+                                title: new Text("Wallet"),
+                                onTap: () => { }
+                            ),
+                            new Divider(
+                                height: 2.0f),
+                            new ListTile(
+                                leading: new Icon(Unity.UIWidgets.material.Icons.accessibility),
+                                title: new Text("Balance"),
+                                onTap: () => { }
+                            )
+                        }
+                    )
+                )
+            );
+        }
+    }
+    
+    class Choice {
+        public Choice(string title, IconData icon) {
+            this.title = title;
+            this.icon = icon;
+        }
+
+        public readonly string title;
+        public readonly IconData icon;
+
+        public static List<Choice> choices = new List<Choice> {
+            new Choice("Car", Unity.UIWidgets.material.Icons.directions_car),
+            new Choice("Bicycle", Unity.UIWidgets.material.Icons.directions_bike),
+            new Choice("Boat", Unity.UIWidgets.material.Icons.directions_boat),
+            new Choice("Bus", Unity.UIWidgets.material.Icons.directions_bus),
+            new Choice("Train", Unity.UIWidgets.material.Icons.directions_railway),
+            new Choice("Walk", Unity.UIWidgets.material.Icons.directions_walk)
+        };
+    }
+
+    class ChoiceCard : StatelessWidget {
+        public ChoiceCard(Key key = null, Choice choice = null) : base(key: key) {
+            this.choice = choice;
+        }
+
+        public readonly Choice choice;
+
+        public override Widget build(BuildContext context) {
+            TextStyle textStyle = Theme.of(context).textTheme.display1;
+            return new Card(
+                color: Colors.white,
+                child: new Center(
+                    child: new Column(
+                        mainAxisSize: MainAxisSize.min,
+                        crossAxisAlignment: CrossAxisAlignment.center,
+                        children: new List<Widget> {
+                            new Icon(this.choice.icon, size: 128.0f, color: textStyle.color),
+                            new RaisedButton(
+                                child: new Text(this.choice.title, style: textStyle),
+                                onPressed: () => {
+                                    SnackBar snackBar = new SnackBar(
+                                        content: new Text(this.choice.title + " is chosen !"),
+                                        action: new SnackBarAction(
+                                            label: "Ok",
+                                            onPressed: () => { }));
+
+                                    Scaffold.of(context).showSnackBar(snackBar);
+                                })
+                        }
+                    )
+                )
+            );
+        }
+    }
+}

Samples/UIWidgetsSamples_2019_4/Assets/MaterialSample/MaterialAppBarSample.cs.meta

+fileFormatVersion: 2
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+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Samples/UIWidgetsSamples_2019_4/Assets/MaterialSample/MaterialButtonSample.cs

+using System.Collections.Generic;
+using Unity.UIWidgets.engine2;
+using Unity.UIWidgets.foundation;
+using Unity.UIWidgets.material;
+using Unity.UIWidgets.painting;
+using Unity.UIWidgets.ui;
+using Unity.UIWidgets.widgets;
+using UnityEngine;
+using Color = Unity.UIWidgets.ui.Color;
+using Material = Unity.UIWidgets.material.Material;
+using ui_ = Unity.UIWidgets.widgets.ui_;
+
+namespace UIWidgetsSample {
+    
+    public class MaterialButtonSample : UIWidgetsPanel {
+
+        protected override void main() {
+            ui_.runApp(new MaterialApp(
+                showPerformanceOverlay: false,
+                home: new MaterialButtonWidget()));
+        }
+
+        protected new void OnEnable() {
+            base.OnEnable();
+        }
+    }
+    
+    public class MaterialButtonWidget : StatefulWidget {
+        public MaterialButtonWidget(Key key = null) : base(key) {
+        }
+
+        public override State createState() {
+            return new MaterialButtonWidgetState();
+        }
+    }
+
+    public class MaterialButtonWidgetState : State<MaterialButtonWidget> {
+        public override Widget build(BuildContext context) {
+            return new Stack(
+                children: new List<Widget> {
+                    new Material(
+                        child: new Center(
+                            child: new Column(
+                                children: new List<Widget> {
+                                    new Padding(padding: EdgeInsets.only(top: 30f)),
+                                    new MaterialButton(
+                                        shape: new RoundedRectangleBorder(borderRadius: BorderRadius.all(20.0f)),
+                                        color: new Color(0xFF00FF00),
+                                        splashColor: new Color(0xFFFF0011),
+                                        highlightColor: new Color(0x88FF0011),
+                                        child: new Text("Click Me"),
+                                        onPressed: () => { Debug.Log("pressed flat button"); }
+                                    ),
+                                    new Padding(padding: EdgeInsets.only(top: 30f)),
+                                    new MaterialButton(
+                                        shape: new RoundedRectangleBorder(borderRadius: BorderRadius.all(20.0f)),
+                                        color: new Color(0xFFFF00FF),
+                                        splashColor: new Color(0xFFFF0011),
+                                        highlightColor: new Color(0x88FF0011),
+                                        elevation: 4.0f,
+                                        child: new Text("Click Me"),
+                                        onPressed: () => { Debug.Log("pressed raised button"); }
+                                    )
+                                }
+                            )
+                        )
+                    )
+                }
+            );
+        }
+    }
+
+}

Samples/UIWidgetsSamples_2019_4/Assets/MaterialSample/MaterialButtonSample.cs.meta

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