feat: add AdornerLayer control.

src/Semi.Avalonia/Controls/AdornerLayer.axaml

@@ -0,0 +1,16 @@
+<ResourceDictionary
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    x:ClassModifier="internal">
+    <ControlTheme x:Key="{x:Type AdornerLayer}" TargetType="AdornerLayer">
+        <Setter Property="DefaultFocusAdorner">
+            <FocusAdornerTemplate>
+                <Rectangle
+                    Margin="{DynamicResource AdornerLayerMargin}"
+                    Stroke="{DynamicResource AdornerLayerBackground}"
+                    StrokeDashArray="1,2"
+                    StrokeThickness="{DynamicResource AdornerLayerThickness}" />
+            </FocusAdornerTemplate>
+        </Setter>
+    </ControlTheme>
+</ResourceDictionary>

src/Semi.Avalonia/Controls/_index.axaml

@@ -3,6 +3,7 @@
     xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <ResourceDictionary.MergedDictionaries>
+        <ResourceInclude Source="avares://Semi.Avalonia/Controls/AdornerLayer.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Controls/AutoCompleteBox.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Controls/Border.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Controls/Button.axaml" />

src/Semi.Avalonia/Themes/Dark/AdornerLayer.axaml

@@ -0,0 +1,3 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <SolidColorBrush x:Key="AdornerLayerBackground" Color="White" />
+</ResourceDictionary>

src/Semi.Avalonia/Themes/Dark/_index.axaml

@@ -2,6 +2,7 @@
     <ResourceDictionary.MergedDictionaries>
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Dark/Palette.axaml" />
         <!--  Controls  -->
+        <ResourceInclude Source="avares://Semi.Avalonia/Themes/Dark/AdornerLayer.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Dark/AutoCompleteBox.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Dark/Border.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Dark/Button.axaml" />

src/Semi.Avalonia/Themes/Light/AdornerLayer.axaml

@@ -0,0 +1,3 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <SolidColorBrush x:Key="AdornerLayerBackground" Color="#1C1F23" />
+</ResourceDictionary>

src/Semi.Avalonia/Themes/Light/_index.axaml

@@ -2,6 +2,7 @@
     <ResourceDictionary.MergedDictionaries>
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Light/Palette.axaml" />
         <!--  Controls  -->
+        <ResourceInclude Source="avares://Semi.Avalonia/Themes/Light/AdornerLayer.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Light/AutoCompleteBox.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Light/Border.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Light/Button.axaml" />

src/Semi.Avalonia/Themes/Shared/AdornerLayer.axaml

@@ -0,0 +1,4 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <Thickness x:Key="AdornerLayerMargin">1</Thickness>
+    <x:Double x:Key="AdornerLayerThickness">1</x:Double>
+</ResourceDictionary>

src/Semi.Avalonia/Themes/Shared/_index.axaml

@@ -2,6 +2,7 @@
     <ResourceDictionary.MergedDictionaries>
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Shared/Palette.axaml" />
         <!--  Controls  -->
+        <ResourceInclude Source="avares://Semi.Avalonia/Themes/Shared/AdornerLayer.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Shared/AutoCompleteBox.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Shared/Border.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Shared/Button.axaml" />