feat: add active class to path icon.

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

@@ -0,0 +1,22 @@
+<UserControl
+    x:Class="Semi.Avalonia.Demo.Pages.PathIconDemo"
+    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 HorizontalAlignment="Left" >
+        <TextBlock Text="Size"></TextBlock>
+        <Slider Name="width" Minimum="0" Maximum="100" Value="20" Width="300"></Slider>
+        <ToggleSwitch Name="active" Content="Active"></ToggleSwitch>
+        <PathIcon
+            Classes.Active="{Binding ElementName=active, Path=IsChecked}"
+            BorderBrush="{DynamicResource SemiRed6}"
+            Width="{Binding #width.Value}"
+            Height="{Binding #width.Value}"
+            Data="M12 3L2 12H5V20H19V12H22L12 3M13 18H11V16H13V18M13 14H11V8H13V14Z"
+            Foreground="{DynamicResource SemiBlue6}" />
+    </StackPanel>
+</UserControl>

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

@@ -0,0 +1,13 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Semi.Avalonia.Demo.Pages;
+
+public partial class PathIconDemo : UserControl
+{
+    public PathIconDemo()
+    {
+        InitializeComponent();
+    }
+}

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

@@ -144,6 +144,9 @@
             <TabItem Header="NumericUpDown">
                 <pages:NumericUpDownDemo />
             </TabItem>
+            <TabItem Header="PathIcon">
+                <pages:PathIconDemo/>
+            </TabItem>
             <TabItem Header="ProgressBar">
                 <pages:ProgressBarDemo />
             </TabItem>

src/Semi.Avalonia/Controls/PathIcon.axaml

@@ -11,6 +11,7 @@
                 <Border Background="{TemplateBinding Background}">
                     <Viewbox Width="{TemplateBinding Width}" Height="{TemplateBinding Height}">
                         <Path
+                            Name="PART_Path"
                             Data="{TemplateBinding Data}"
                             Fill="{TemplateBinding Foreground}"
                             Stretch="Uniform" />
@@ -18,5 +19,8 @@
                 </Border>
             </ControlTemplate>
         </Setter>
+        <Style Selector="^.Active /template/ Path#PART_Path">
+            <Setter Property="Fill" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=BorderBrush}"></Setter>
+        </Style>
     </ControlTheme>
 </ResourceDictionary>