feat: add demo.

demo/Ursa.Demo/Models/MenuKeys.cs

@@ -6,6 +6,7 @@ public static class MenuKeys
     public const string MenuKeyBadge = "Badge";
     public const string MenuKeyBanner = "Banner";
     public const string MenuKeyButtonGroup = "ButtonGroup";
+    public const string MenuKeyBreadcrumb = "Breadcrumb";
     public const string MenuKeyClassInput = "Class Input";
     public const string MenuKeyDialog = "Dialog";
     public const string MenuKeyDivider = "Divider";

demo/Ursa.Demo/Pages/BreadcrumbDemo.axaml

@@ -0,0 +1,15 @@
+<UserControl 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"
+             xmlns:u="https://irihi.tech/ursa"
+             mc:Ignorable="d" d:DesignWidth="800"
+             d:DesignHeight="450"
+             x:Class="Ursa.Demo.Pages.BreadcrumbDemo">
+    <StackPanel>
+        <u:Breadcrumb>
+            <TextBlock Text="Hello"></TextBlock>
+            <u:BreadcrumbItem Content="World" Icon="?"></u:BreadcrumbItem>
+        </u:Breadcrumb>
+    </StackPanel>
+</UserControl>

demo/Ursa.Demo/Pages/BreadcrumbDemo.axaml.cs

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

demo/Ursa.Demo/ViewModels/BreadcrumbDemoViewModel.cs

@@ -0,0 +1,8 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace Ursa.Demo.ViewModels;
+
+public class BreadcrumbDemoViewModel: ObservableObject
+{
+    
+}

demo/Ursa.Demo/ViewModels/MainViewViewModel.cs

@@ -28,6 +28,7 @@ public class MainViewViewModel : ViewModelBase
             MenuKeys.MenuKeyBadge => new BadgeDemoViewModel(),
             MenuKeys.MenuKeyBanner => new BannerDemoViewModel(),
             MenuKeys.MenuKeyButtonGroup => new ButtonGroupDemoViewModel(),
+            MenuKeys.MenuKeyBreadcrumb => new BreadcrumbDemoViewModel(),
             MenuKeys.MenuKeyClassInput => new ClassInputDemoViewModel(),
             MenuKeys.MenuKeyDialog => new DialogDemoViewModel(),
             MenuKeys.MenuKeyDivider => new DividerDemoViewModel(),

demo/Ursa.Demo/ViewModels/MenuViewModel.cs

@@ -14,6 +14,7 @@ public class MenuViewModel: ViewModelBase
             new() { MenuHeader = "Controls", IsSeparator = true },
             new() { MenuHeader = "Badge", Key = MenuKeys.MenuKeyBadge, Status = "Updated"},
             new() { MenuHeader = "Banner", Key = MenuKeys.MenuKeyBanner },
+            new() { MenuHeader = "Breadcrumb", Key = MenuKeys.MenuKeyBreadcrumb, Status = "New" },
             new() { MenuHeader = "Button Group", Key = MenuKeys.MenuKeyButtonGroup},
             new() { MenuHeader = "Class Input", Key = MenuKeys.MenuKeyClassInput, Status = "New" },
             new() { MenuHeader = "Dialog", Key = MenuKeys.MenuKeyDialog, Status = "Updated"},

src/Ursa.Themes.Semi/Controls/Breadcrumb.axaml

@@ -0,0 +1,25 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:u="https://irihi.tech/ursa">
+    <!-- Add Resources Here -->
+    <ControlTheme x:Key="{x:Type u:Breadcrumb}" TargetType="u:Breadcrumb">
+        <Setter Property="Template">
+            <ControlTemplate TargetType="u:Breadcrumb">
+                <ItemsPresenter ItemsPanel="{TemplateBinding ItemsPanel}" />
+            </ControlTemplate>
+        </Setter>
+    </ControlTheme>
+    
+    <ControlTheme x:Key="{x:Type u:BreadcrumbItem}" TargetType="u:BreadcrumbItem">
+        <Setter Property="Template">
+            <ControlTemplate TargetType="u:BreadcrumbItem">
+                <Border BorderBrush="Red" BorderThickness="2" Margin="4">
+                    <StackPanel Orientation="Horizontal">
+                        <ContentPresenter Content="{TemplateBinding Icon}" />
+                        <ContentPresenter Name="PART_ContentPresenter" Content="{TemplateBinding Content}"/>
+                    </StackPanel>
+                </Border>
+            </ControlTemplate>
+        </Setter>
+    </ControlTheme>
+</ResourceDictionary>

src/Ursa.Themes.Semi/Controls/_index.axaml

@@ -4,6 +4,7 @@
         <ResourceInclude Source="Badge.axaml" />
         <ResourceInclude Source="Banner.axaml" />
         <ResourceInclude Source="ButtonGroup.axaml" />
+        <ResourceInclude Source="Breadcrumb.axaml" />
         <ResourceInclude Source="ControlClassesInput.axaml" />
         <ResourceInclude Source="Dialog.axaml" />
         <ResourceInclude Source="DialogShared.axaml" />

src/Ursa/Controls/Breadcrumb/Breadcrumb.cs

@@ -4,6 +4,7 @@ using Avalonia.Controls.Templates;
 using Avalonia.Data;
 using Avalonia.Layout;
 using Avalonia.Metadata;
+using Irihi.Avalonia.Shared.Helpers;
 
 namespace Ursa.Controls;
 
@@ -47,6 +48,15 @@ public class Breadcrumb: ItemsControl
         get => GetValue(SeparatorProperty);
         set => SetValue(SeparatorProperty, value);
     }
+
+    public static readonly StyledProperty<IDataTemplate?> IconTemplateProperty = AvaloniaProperty.Register<Breadcrumb, IDataTemplate?>(
+        nameof(IconTemplate));
+
+    public IDataTemplate? IconTemplate
+    {
+        get => GetValue(IconTemplateProperty);
+        set => SetValue(IconTemplateProperty, value);
+    }
     
     static Breadcrumb()
     {
@@ -66,20 +76,23 @@ public class Breadcrumb: ItemsControl
     protected override void PrepareContainerForItemOverride(Control container, object? item, int index)
     {
         base.PrepareContainerForItemOverride(container, item, index);
-        if (container is BreadcrumbItem breadcrumbItem)
+        if (container is not BreadcrumbItem breadcrumbItem) return;
+        if (!breadcrumbItem.IsSet(BreadcrumbItem.SeparatorProperty))
         {
-            if (!breadcrumbItem.IsSet(BreadcrumbItem.SeparatorProperty))
+            SeparatorProperty.Changed.AddClassHandler<Breadcrumb, object?>((o, e) =>
             {
-                SeparatorProperty.Changed.AddClassHandler<Breadcrumb, object?>((o, e) =>
+                breadcrumbItem.Separator = e.NewValue.Value switch
                 {
-                    breadcrumbItem.Separator = e.NewValue.Value switch
-                    {
-                        string s => s,
-                        ITemplate<Control> t => t.Build(),
-                        _ => e.NewValue.Value?.ToString()
-                    };
-                });
-            }
+                    string s => s,
+                    ITemplate<Control> t => t.Build(),
+                    _ => e.NewValue.Value?.ToString()
+                };
+            });
+        }
+        bool b = breadcrumbItem.IsSet(BreadcrumbItem.IconProperty);
+        if(!breadcrumbItem.IsSet(BreadcrumbItem.IconProperty) && IconBinding != null)
+        {
+            breadcrumbItem[!BreadcrumbItem.IconProperty] = IconBinding;
         }
     }
 }

src/Ursa/Controls/Breadcrumb/BreadcrumbItem.cs

@@ -1,6 +1,7 @@
 using System.Windows.Input;
 using Avalonia;
 using Avalonia.Controls;
+using Avalonia.Controls.Templates;
 
 namespace Ursa.Controls;
 
@@ -34,6 +35,15 @@ public class BreadcrumbItem: ContentControl
         set => SetValue(CommandProperty, value);
     }
 
+    public static readonly StyledProperty<IDataTemplate?> IconTemplateProperty = AvaloniaProperty.Register<BreadcrumbItem, IDataTemplate?>(
+        nameof(IconTemplate));
+
+    public IDataTemplate? IconTemplate
+    {
+        get => GetValue(IconTemplateProperty);
+        set => SetValue(IconTemplateProperty, value);
+    }
+
     static BreadcrumbItem()
     {