feat: add NumericUpDown template. No resource is required in this control.

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

@@ -0,0 +1,34 @@
+<UserControl
+    x:Class="Semi.Avalonia.Demo.Pages.NumericUpDownDemo"
+    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"
+        HorizontalAlignment="Left"
+        Spacing="20">
+        <NumericUpDown
+            Width="200"
+            Maximum="100"
+            Minimum="0" />
+        <NumericUpDown
+            Width="200"
+            Increment="10"
+            Maximum="100"
+            Minimum="0" />
+        <NumericUpDown
+            Width="200"
+            ButtonSpinnerLocation="Left"
+            Maximum="100"
+            Minimum="0" />
+        <NumericUpDown
+            Width="200"
+            Maximum="100"
+            Minimum="0"
+            ShowButtonSpinner="False" />
+    </StackPanel>
+</UserControl>

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

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

demo/Semi.Avalonia.Demo/Views/MainView.axaml

@@ -48,6 +48,9 @@
         <TabItem Header="Notification">
             <pages:NotificationDemo />
         </TabItem>
+        <TabItem Header="NumericUpDown">
+            <pages:NumericUpDownDemo />
+        </TabItem>
         <TabItem Header="ProgressBar">
             <pages:ProgressBarDemo />
         </TabItem>

src/Semi.Avalonia/Controls/NumericUpDown.axaml

@@ -1,3 +1,37 @@
 <ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <!--  Add Resources Here  -->
+    <ControlTheme x:Key="{x:Type NumericUpDown}" TargetType="NumericUpDown">
+        <Setter Property="NumericUpDown.VerticalContentAlignment" Value="Center" />
+        <Setter Property="NumericUpDown.Template">
+            <ControlTemplate>
+                <ButtonSpinner
+                    Name="PART_Spinner"
+                    MinWidth="0"
+                    HorizontalContentAlignment="Stretch"
+                    VerticalContentAlignment="Stretch"
+                    AllowSpin="{TemplateBinding AllowSpin}"
+                    Background="{TemplateBinding Background}"
+                    BorderBrush="{TemplateBinding BorderBrush}"
+                    BorderThickness="{TemplateBinding BorderThickness}"
+                    ButtonSpinnerLocation="{TemplateBinding ButtonSpinnerLocation}"
+                    CornerRadius="{TemplateBinding CornerRadius}"
+                    ShowButtonSpinner="{TemplateBinding ShowButtonSpinner}">
+                    <TextBox
+                        Name="PART_TextBox"
+                        MinWidth="0"
+                        Padding="{TemplateBinding Padding}"
+                        HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
+                        VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
+                        AcceptsReturn="False"
+                        FontSize="{TemplateBinding FontSize}"
+                        Foreground="{TemplateBinding Foreground}"
+                        IsReadOnly="{TemplateBinding IsReadOnly}"
+                        Text="{TemplateBinding Text}"
+                        TextWrapping="NoWrap"
+                        Watermark="{TemplateBinding Watermark}" />
+                </ButtonSpinner>
+            </ControlTemplate>
+        </Setter>
+    </ControlTheme>
+
 </ResourceDictionary>