feat: add a border to template.

demo/Ursa.Demo/Pages/MarqueeDemo.axaml

@@ -25,6 +25,13 @@
                 u:FormItem.Label="VerticalContentAlignment"
                 EnumType="{x:Type VerticalAlignment}"
                 Value="{x:Static VerticalAlignment.Center}" />
+            <u:NumericDoubleUpDown 
+                Name="speed"
+                AllowDrag="True"
+                u:FormItem.Label="Speed"
+                Minimum="1"
+                Maximum="300"
+                Value="60"/>
             <ToggleSwitch
                 Name="running"
                 u:FormItem.Label="IsRunning"
@@ -35,6 +42,7 @@
             Height="100"
             HorizontalContentAlignment="{Binding #horizontal.Value}"
             VerticalContentAlignment="{Binding #vertical.Value}"
+            Speed="{Binding #speed.Value}"
             Background="{DynamicResource SemiBlue1}"
             Direction="{Binding #direction.Value}"
             IsRunning="{Binding #running.IsChecked}">

src/Ursa.Themes.Semi/Controls/Marquee.axaml

@@ -7,12 +7,19 @@
     <ControlTheme x:Key="{x:Type u:Marquee}" TargetType="u:Marquee">
         <Setter Property="Template">
             <ControlTemplate>
-                <Canvas Background="{TemplateBinding Background}">
-                    <ContentPresenter
-                        Name="{x:Static iri:PartNames.PART_ContentPresenter}"
-                        Content="{TemplateBinding Content}"
-                        ContentTemplate="{TemplateBinding ContentTemplate}" />
-                </Canvas>
+                <Border
+                    Background="{TemplateBinding Background}"
+                    BackgroundSizing="{TemplateBinding BackgroundSizing}"
+                    BorderBrush="{TemplateBinding BorderBrush}"
+                    CornerRadius="{TemplateBinding CornerRadius}"
+                    BorderThickness="{TemplateBinding BorderThickness}">
+                    <Canvas>
+                        <ContentPresenter
+                            Name="{x:Static iri:PartNames.PART_ContentPresenter}"
+                            Content="{TemplateBinding Content}"
+                            ContentTemplate="{TemplateBinding ContentTemplate}" />
+                    </Canvas>
+                </Border>
             </ControlTemplate>
         </Setter>
     </ControlTheme>

src/Ursa/Controls/Marquee/Marquee.cs

@@ -114,7 +114,7 @@ public class Marquee : ContentControl
         {
             Canvas.SetTop(Presenter, location.Value.top);
             Canvas.SetLeft(Presenter, location.Value.left);
-        }, DispatcherPriority.Background);
+        }, DispatcherPriority.Render);
     }
 
     private void InvalidatePresenterPosition()