feat: add menu infra.

demo/Semi.Avalonia.Demo/Pages/MenuDemo.axaml

@@ -0,0 +1,20 @@
+<UserControl
+    x:Class="Semi.Avalonia.Demo.Pages.MenuDemo"
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    d:DesignHeight="450"
+    d:DesignWidth="800"
+    mc:Ignorable="d">
+    <StackPanel Margin="20" Spacing="20">
+        <Menu>
+            <MenuItem Header="File">
+                <MenuItem Header="Create" />
+                <MenuItem Header="Delete" />
+            </MenuItem>
+            <MenuItem Header="View" />
+            <MenuItem Header="Tools" />
+        </Menu>
+    </StackPanel>
+</UserControl>

demo/Semi.Avalonia.Demo/Pages/MenuDemo.axaml.cs

@@ -0,0 +1,18 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Semi.Avalonia.Demo.Pages;
+
+public partial class MenuDemo : UserControl
+{
+    public MenuDemo()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+}

src/Semi.Avalonia/Controls/Controls.axaml

@@ -13,6 +13,8 @@
         <ResourceInclude Source="avares://Semi.Avalonia/Controls/ItemsControl.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Controls/Label.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Controls/ListBox.axaml" />
+        <ResourceInclude Source="avares://Semi.Avalonia/Controls/Menu.axaml" />
+        <ResourceInclude Source="avares://Semi.Avalonia/Controls/MenuFlyoutPresenter.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Controls/NotificationCard.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Controls/NumericUpDown.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Controls/PathIcon.axaml" />

src/Semi.Avalonia/Controls/Menu.axaml

@@ -0,0 +1,3 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <!--  Add Resources Here  -->
+</ResourceDictionary>

src/Semi.Avalonia/Controls/MenuFlyoutPresenter.axaml

@@ -0,0 +1,3 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <!--  Add Resources Here  -->
+</ResourceDictionary>

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

@@ -11,6 +11,7 @@
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Light/Expander.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Light/Label.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Light/ListBox.axaml" />
+        <ResourceInclude Source="avares://Semi.Avalonia/Themes/Light/Menu.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Light/NotificationCard.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Light/NumericUpDown.axaml" />
         <ResourceInclude Source="avares://Semi.Avalonia/Themes/Light/ProgressBar.axaml" />

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

@@ -0,0 +1,3 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <!--  Add Resources Here  -->
+</ResourceDictionary>