C# Avalonia 21- MenusAndToolbars- MixedMenus

MixedMenus.axaml

<Window 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"
        Height="300" Width="300"
        xmlns:local="using:AvaloniaUI"
        x:DataType="local:MixedMenus"
        x:Class="AvaloniaUI.MixedMenus"
        Title="MixedMenus">
    
    <Grid Margin="5"
           RowDefinitions="auto,auto,auto"
           ColumnDefinitions="*,*">
        <!-- 左上：Menu + Button -->
        <StackPanel Grid.Row="0" Grid.Column="0">
            <Menu VerticalAlignment="Top">
                <MenuItem Header="File">
                    <MenuItem Header="Open"/>
                </MenuItem>
                <MenuItem Header="Help"/>
            </Menu>

            <Button Padding="3" Margin="5">An Ordinary Button</Button>
        </StackPanel>

        <!-- 左中：TextBox -->
        <TextBox Grid.Row="1" Grid.Column="0" Margin="5" Text="A TextBox"/>

        <!-- 右中：CheckBox + Menu -->
        <StackPanel Grid.Row="1" Grid.Column="1">
            <CheckBox Margin="5">A CheckBox</CheckBox>
            <Menu VerticalAlignment="Top">
                <MenuItem Header="File"/>
                <MenuItem Header="Help"/>
            </Menu>
        </StackPanel>

        <!-- 底部：Menu -->
        <Menu Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="2"
              Margin="5"
              VerticalAlignment="Top"
              HorizontalAlignment="Left">
            <MenuItem Header="File">
                <MenuItem Header="New"/>
                <Separator/>
                <MenuItem Header="Open">
                    <MenuItem Header="Open More"/>
                </MenuItem>
                <MenuItem Header="Save" InputGesture="Ctrl+S"
                          HotKey="Ctrl+S" Command="{Binding SaveCommand}">
                    <MenuItem.Icon>
                        <PathIcon Data="M4,4 H14 V14 H4 Z M8,8 H18 V18 H8 Z"/>
                    </MenuItem.Icon>
                </MenuItem>
            </MenuItem>
        </Menu>
    </Grid>    
</Window>

MixedMenus.axaml.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Markup.Xaml;
using CommunityToolkit.Mvvm.Input;
using Shares.Avalonia;

namespace AvaloniaUI;

public partial class MixedMenus : Window
{
    public MixedMenus()
    {
        InitializeComponent();
        this.DataContext = this;
    }

    [RelayCommand]
    private void Save()
    {
        MessageBox.Show(this, "Save command");
    }
}

运行效果