scaffold test sample

Runtime/material/app_bar.cs

         }
     }
 
-    class AppBar : StatefulWidget, IPreferredSizeWidget {
+    public class AppBar : StatefulWidget, IPreferredSizeWidget {
         public AppBar(
             Key key = null,
             Widget leading = null,

Runtime/material/scaffold.cs

     public class Scaffold : StatefulWidget {
         public Scaffold(
             Key key = null,
-            PreferredSizeWidget appBar = null,
+            AppBar appBar = null,
             Widget body = null,
             Widget floatingActionButton = null,
             FloatingActionButtonLocation floatingActionButtonLocation = null,
             this.primary = primary;
         }
 
-        public readonly PreferredSizeWidget appBar;
+        public readonly AppBar appBar;
 
         public readonly Widget body;
 

Samples/UIWidgetSample/MaterialSample.cs

 using System.Collections.Generic;
+using System.Linq;
+using Unity.UIWidgets.rendering;
 using Unity.UIWidgets.widgets;
 using UnityEngine;
 using Color = Unity.UIWidgets.ui.Color;
     public class MaterialSample : UIWidgetsSamplePanel {
-        int testCaseId = 0;
+        int testCaseId = 2;
-            new MaterialInkWellWidget()
+            new MaterialInkWellWidget(),
+            new MaterialAppBarWidget()
+        }
+    }
+
+    class MaterialAppBarWidget : StatefulWidget {
+        public MaterialAppBarWidget(Key key = null) : base(key) {
+            
+        }
+        public override State createState() {
+            return new MaterialAppBarWidgetState();
+        }
+    }
+
+    class MaterialAppBarWidgetState : State<MaterialAppBarWidget> {
+        Choice _selectedChoice = Choice.choices[0];
+
+        void _select(Choice choice) {
+            this.setState(() => { this._selectedChoice = choice; });
+        }
+
+        public override Widget build(BuildContext context) {
+            return new MaterialApp(
+                home: new Scaffold(
+                    appBar: new AppBar(
+                        title: new Text("Basic AppBar"),
+                        actions: new List<Widget> {
+                            new IconButton(
+                                icon: new Icon(Choice.choices[0].icon),
+                                onPressed: () => {
+                                    this._select((Choice.choices[0]));
+                                }
+                                ),
+                            new IconButton(
+                                icon: new Icon(Choice.choices[1].icon),
+                                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)
+                        )
+                    )
+                );
+        }
+    }
+
+
+    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 Text(this.choice.title, style: textStyle)
+                        }
+                    )
+                )
+            );
         }
     }