feat: fix content preparation logic.

demo/Ursa.Demo/Pages/BreadcrumbDemo.axaml

@@ -1,17 +1,37 @@
-<UserControl xmlns="https://github.com/avaloniaui"
+<UserControl
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    x:Class="Ursa.Demo.Pages.BreadcrumbDemo"
-             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns="https://github.com/avaloniaui"
-             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:u="https://irihi.tech/ursa"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-             mc:Ignorable="d" d:DesignWidth="800"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-             d:DesignHeight="450"
+    xmlns:u="https://irihi.tech/ursa"
-             x:Class="Ursa.Demo.Pages.BreadcrumbDemo">
+    xmlns:vm="using:Ursa.Demo.ViewModels"
+    xmlns:converters="clr-namespace:Ursa.Demo.Converters"
+    d:DesignHeight="450"
+    d:DesignWidth="800"
+    x:CompileBindings="True"
+    x:DataType="vm:BreadcrumbDemoViewModel"
+    mc:Ignorable="d">
+    <UserControl.Resources>
+        <converters:IconNameToPathConverter x:Key="IconConverter" />
+    </UserControl.Resources>
     <StackPanel>
-        <u:Breadcrumb >
+        
-            <TextBlock Text="Hello"></TextBlock>
+        <u:Breadcrumb>
-            <u:BreadcrumbItem Icon="?" Separator="♥"></u:BreadcrumbItem>
+            <TextBlock Text="Hello" />
-            <TextBlock Text="Avalonia"></TextBlock>
+            <u:BreadcrumbItem Icon="?" Separator="♥" />
-            <TextBlock Text="Ursa"></TextBlock>
+            <TextBlock Text="Avalonia" />
+            <TextBlock Text="Ursa" />
+        </u:Breadcrumb>
+        <u:Breadcrumb
+            DisplayMemberBinding="{Binding Section}"
+            IconBinding="{Binding Icon}"
+            ItemsSource="{Binding Items1}">
+            <u:Breadcrumb.IconTemplate>
+                <DataTemplate DataType="x:String">
+                    <PathIcon Width="12" Height="12" Data="{Binding Path=., Converter={StaticResource IconConverter}}"></PathIcon>
+                </DataTemplate>
+            </u:Breadcrumb.IconTemplate>
         </u:Breadcrumb>
     </StackPanel>
 </UserControl>

demo/Ursa.Demo/ViewModels/BreadcrumbDemoViewModel.cs

@@ -1,8 +1,26 @@
+using System.Collections.ObjectModel;
 using CommunityToolkit.Mvvm.ComponentModel;
 
 namespace Ursa.Demo.ViewModels;
 
 public class BreadcrumbDemoViewModel: ObservableObject
 {
-    
+    public ObservableCollection<BreadcrumbDemoItem> Items1 { get; set; }
+
+    public BreadcrumbDemoViewModel()
+    {
+        Items1 = new ObservableCollection<BreadcrumbDemoItem>()
+        {
+            new BreadcrumbDemoItem() { Section = "Home", Icon = "Home" },
+            new BreadcrumbDemoItem() { Section = "Page 1", Icon = "Page" },
+            new BreadcrumbDemoItem() { Section = "Page 2", Icon = "Page" },
+            new BreadcrumbDemoItem() { Section = "Page 3", Icon = "Page" },
+        };
+    }
+}
+
+public class BreadcrumbDemoItem: ObservableObject
+{
+    public string Section { get; set; }
+    public string Icon { get; set; }
 }

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

@@ -1,8 +1,18 @@
 <ResourceDictionary xmlns="https://github.com/avaloniaui"
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                     xmlns:u="https://irihi.tech/ursa">
-    <!-- Add Resources Here -->
+    <Design.PreviewWith>
+        <StackPanel>
+            <u:Breadcrumb >
+                <TextBlock Text="Hello"></TextBlock>
+                <u:BreadcrumbItem Icon="?" Separator="♥"></u:BreadcrumbItem>
+                <TextBlock Text="Avalonia"></TextBlock>
+                <TextBlock Text="Ursa"></TextBlock>
+            </u:Breadcrumb>
+        </StackPanel>
+    </Design.PreviewWith>
     <ControlTheme x:Key="{x:Type u:Breadcrumb}" TargetType="u:Breadcrumb">
+        <Setter Property="Separator" Value="/"></Setter>
         <Setter Property="Template">
             <ControlTemplate TargetType="u:Breadcrumb">
                 <ItemsPresenter ItemsPanel="{TemplateBinding ItemsPanel}" />
@@ -15,8 +25,8 @@
             <ControlTemplate TargetType="u:BreadcrumbItem">
                 <Border BorderBrush="Red" BorderThickness="2" Margin="4">
                     <StackPanel Orientation="Horizontal">
-                        <ContentPresenter Content="{TemplateBinding Icon}" />
+                        <ContentPresenter Content="{TemplateBinding Icon}" ContentTemplate="{TemplateBinding IconTemplate}" />
-                        <ContentPresenter Name="PART_ContentPresenter" Content="{TemplateBinding Content}"/>
+                        <ContentPresenter Name="PART_ContentPresenter" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}"/>
                         <ContentPresenter Name="Separator" Content="{TemplateBinding Separator}"></ContentPresenter>
                     </StackPanel>
                 </Border>

src/Ursa/Controls/Breadcrumb/Breadcrumb.cs

@@ -4,7 +4,6 @@ using Avalonia.Controls.Templates;
 using Avalonia.Data;
 using Avalonia.Layout;
 using Avalonia.Metadata;
-using Irihi.Avalonia.Shared.Helpers;
 
 namespace Ursa.Controls;
 
@@ -84,7 +83,8 @@ public class Breadcrumb: ItemsControl
 
     protected override void PrepareContainerForItemOverride(Control container, object? item, int index)
     {
-        base.PrepareContainerForItemOverride(container, item, index);
+        // base.PrepareContainerForItemOverride(container, item, index);
+        if (container == item) return;
         if (container is not BreadcrumbItem breadcrumbItem) return;
         if (!breadcrumbItem.IsSet(BreadcrumbItem.SeparatorProperty))
         {
@@ -98,6 +98,14 @@ public class Breadcrumb: ItemsControl
                     breadcrumbItem.Separator = b;
             });
         }
+        if(!breadcrumbItem.IsSet(ContentControl.ContentProperty))
+        {
+            breadcrumbItem.SetCurrentValue(ContentControl.ContentProperty, item);
+            if (DisplayMemberBinding is not null)
+            {
+                breadcrumbItem[!ContentControl.ContentProperty] = DisplayMemberBinding;
+            }
+        }
         if (!breadcrumbItem.IsSet(BreadcrumbItem.IconProperty) && IconBinding != null)
         {
             breadcrumbItem[!BreadcrumbItem.IconProperty] = IconBinding;