feat: add clock template.

demo/Ursa.Demo/Pages/ClockDemo.axaml

@@ -9,12 +9,6 @@
     d:DesignWidth="800"
     mc:Ignorable="d">
     <Grid>
-        <u:ClockTicks
+        <u:Clock HorizontalAlignment="Left"></u:Clock>
-            HorizontalAlignment="Stretch"
-            VerticalAlignment="Stretch"
-            HourTickWidth="4"
-            MinuteTickWidth="1"
-            HourTickForeground="Black"
-            MinuteTickForeground="Red" />
     </Grid>
 </UserControl>

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

@@ -0,0 +1,21 @@
+<ResourceDictionary
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:iri="https://irihi.tech/shared"
+    xmlns:u="https://irihi.tech/ursa">
+    <!--  Add Resources Here  -->
+    <ControlTheme x:Key="{x:Type u:Clock}" TargetType="u:Clock">
+        <Setter Property="Template">
+            <ControlTemplate TargetType="u:Clock">
+                <Grid>
+                    <u:ClockTicks HorizontalAlignment="{TemplateBinding HorizontalAlignment}" HourTickForeground="{DynamicResource SemiGrey6}" MinuteTickForeground="{DynamicResource SemiGrey4}" />
+                    <Rectangle Width="8" Height="100" Fill="White" />
+                    <Rectangle Width="4" />
+                    <iri:PureCircle
+                        Diameter="16"
+                        Background="Red" />
+                </Grid>
+            </ControlTemplate>
+        </Setter>
+    </ControlTheme>
+</ResourceDictionary>

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

@@ -6,6 +6,7 @@
         <ResourceInclude Source="ButtonGroup.axaml" />
         <ResourceInclude Source="Breadcrumb.axaml" />
         <ResourceInclude Source="ControlClassesInput.axaml" />
+        <ResourceInclude Source="Clock.axaml" />
         <ResourceInclude Source="Dialog.axaml" />
         <ResourceInclude Source="DialogShared.axaml" />
         <ResourceInclude Source="DisableContainer.axaml" />

src/Ursa/Controls/Clock/Clock.cs

@@ -36,4 +36,37 @@ public class Clock: TemplatedControl
         set => SetValue(ShowMinuteTicksProperty, value);
     }
 
+    public static readonly StyledProperty<double> HourHandMarginProperty = AvaloniaProperty.Register<Clock, double>(
+        nameof(HourHandMargin));
+
+    public double HourHandMargin
+    {
+        get => GetValue(HourHandMarginProperty);
+        set => SetValue(HourHandMarginProperty, value);
+    }
+    
+    public static readonly StyledProperty<double> MinuteHandMarginProperty = AvaloniaProperty.Register<Clock, double>(
+        nameof(MinuteHandMargin));
+    
+    public double MinuteHandMargin
+    {
+        get => GetValue(MinuteHandMarginProperty);
+        set => SetValue(MinuteHandMarginProperty, value);
+    }
+
+    protected override Size MeasureOverride(Size availableSize)
+    {
+        double min = Math.Min(availableSize.Height, availableSize.Width);
+        var newSize = new Size(min, min);
+        var size = base.MeasureOverride(newSize);
+        return size;
+    }
+
+    protected override Size ArrangeOverride(Size finalSize)
+    {
+        double min = Math.Min(finalSize.Height, finalSize.Width);
+        var newSize = new Size(min, min);
+        var size = base.ArrangeOverride(newSize);
+        return size;
+    }
 }

src/Ursa/Controls/Clock/ClockTicks.cs

@@ -86,6 +86,18 @@ public class ClockTicks: Control
         AffectsRender<ClockTicks>(ShowHourTicksProperty);
     }
 
+    protected override Size MeasureOverride(Size availableSize)
+    {
+        double minSize= Math.Min(availableSize.Width, availableSize.Height);
+        return new Size(minSize, minSize);
+    }
+
+    protected override Size ArrangeOverride(Size finalSize)
+    {
+        var minSize = Math.Min(finalSize.Width, finalSize.Height);
+        return new Size(minSize, minSize);
+    }
+
     public override void Render(DrawingContext context)
     {
         base.Render(context);