update

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

 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 {
 
             ThemeData theme = Theme.of(context);
             DialogTheme dialogTheme = DialogTheme.of(context);
-
+            
             Widget titleWidget = null;
             Widget contentWidget = null;
             Widget actionsWidget = null;
         public static Future<T> showDialog<T>(
             BuildContext context = null,
             bool barrierDismissible = true,
+            Widget child = null,
+            D.assert(child == null || builder == null);
             D.assert(debugCheckHasMaterialLocalizations(context));
 
             ThemeData theme = Theme.of(context, shadowThemeOnly: true);
-                    Widget pageChild = new Builder(builder: builder);
+                    Widget pageChild = child ?? new Builder(builder: builder);
                     return new SafeArea(
                         child: new Builder(
                             builder: (_) => theme != null

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

 
         public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
             base.debugFillProperties(properties);
-            properties.add(new DiagnosticsProperty<Color>("backgroundColor", backgroundColor));
+            properties.add(new ColorProperty("backgroundColor", backgroundColor));
-            properties.add(new DiagnosticsProperty<float?>("elevation", elevation));
+            properties.add(new FloatProperty("elevation", elevation));
             properties.add(new DiagnosticsProperty<TextStyle>("titleTextStyle", titleTextStyle));
             properties.add(new DiagnosticsProperty<TextStyle>("contentTextStyle", contentTextStyle));
         }

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

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

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

         readonly List<float> _rowTops = new List<float>();
         List<float> _columnLefts;
 
-        Rect getRowBox(int row) {
+       public Rect getRowBox(int row) {
             D.assert(row >= 0);
             D.assert(row < rows);
 

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

         public static bool debugPrintGlobalKeyedWidgetLifecycle = false;
 
         public static bool debugPrintScheduleBuildForStacks = false;
-        
+
-       
+
         public static bool debugHighlightDeprecatedWidgets = false;
 
         static Key _firstNonUniqueKey(IEnumerable<Widget> widgets) {
             return false;
         }
 
+        public static bool debugCheckHasTable(BuildContext context) {
+            D.assert(() => {
+                if (!(context.widget is Table) && context.findAncestorWidgetOfExactType<Table>() == null) {
+                    throw new UIWidgetsError(new List<DiagnosticsNode> {
+                        new ErrorSummary("No Table widget found."),
+                        new ErrorDescription($"{context.widget.GetType()} widgets require a Table widget ancestor."),
+                        context.describeWidget("The specific widget that could not find a Table ancestor was"),
+                        context.describeOwnershipChain("The ownership chain for the affected widget is")
+                    });
+                }
+
+                return true;
+            });
+            return true;
+        }
+
         public static void debugWidgetBuilderValue(Widget widget, Widget built) {
             D.assert(() => {
                 if (built == null) {
                 if (!(context.widget is MediaQuery) && context.findAncestorWidgetOfExactType<MediaQuery>() == null) {
                     throw new UIWidgetsError(new List<DiagnosticsNode> {
                         new ErrorSummary("No MediaQuery widget found."),
-                        new ErrorDescription($"{context.widget.GetType()} widgets require a MediaQuery widget ancestor."),
+                        new ErrorDescription(
+                            $"{context.widget.GetType()} widgets require a MediaQuery widget ancestor."),
                         context.describeWidget("The specific widget that could not find a MediaQuery ancestor was"),
                         context.describeOwnershipChain("The ownership chain for the affected widget is"),
                         new ErrorHint(
             D.assert(() => {
                 if (!(context.widget is Directionality) &&
                     context.findAncestorWidgetOfExactType<Directionality>() == null) {
-                    throw new UIWidgetsError(new List<DiagnosticsNode>{
+                    throw new UIWidgetsError(new List<DiagnosticsNode> {
-                        new ErrorDescription($"{context.widget.GetType()} widgets require a Directionality widget ancestor.\n"),
+                        new ErrorDescription(
+                            $"{context.widget.GetType()} widgets require a Directionality widget ancestor.\n"),
                         context.describeWidget("The specific widget that could not find a Directionality ancestor was"),
                         context.describeOwnershipChain("The ownership chain for the affected widget is"),
                         new ErrorHint(
             UIWidgetsError.reportError(details);
             return details;
         }
-        
+
-            D.assert(()=> {
+            D.assert(() => {
                 if (debugPrintRebuildDirtyWidgets ||
                     debugPrintBuildScope ||
                     debugPrintScheduleBuildForStacks ||
                     throw new UIWidgetsError(reason);
                 }
+
-
     }
 }