fix: only update Placement=Top/Bottom in TabbedPage.

demo/Semi.Avalonia.Demo/Converters/FileIconConverter.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using Avalonia;
+using Avalonia.Data.Converters;
+using Avalonia.Metadata;
+
+namespace Semi.Avalonia.Demo.Converters;
+
+public class FileIconConverter : IMultiValueConverter
+{
+    [Content] public IDictionary<string, object?> Items { get; } = new Dictionary<string, object?>();
+
+    public object? Convert(IList<object?> values, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (values[0] is bool isDirectory && values[1] is bool isOpen)
+        {
+            if (!isDirectory)
+            {
+                return Items["file"];
+            }
+
+            return isOpen ? Items["folderOpen"] : Items["folderClosed"];
+        }
+
+        return AvaloniaProperty.UnsetValue;
+    }
+}

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

@@ -29,40 +29,40 @@
 
         <AutoCompleteBox
             PlaceholderText="Please select a State"
-            ValueMemberBinding="{Binding Name,x:DataType=vm:StateData}" />
+            ValueMemberBinding="{Binding Name,DataType=vm:StateData}" />
         <AutoCompleteBox
             Classes="Large"
-            ValueMemberBinding="{Binding Name,x:DataType=vm:StateData}" />
+            ValueMemberBinding="{Binding Name,DataType=vm:StateData}" />
         <AutoCompleteBox
             Classes="Small"
-            ValueMemberBinding="{Binding Name,x:DataType=vm:StateData}" />
+            ValueMemberBinding="{Binding Name,DataType=vm:StateData}" />
         <AutoCompleteBox
             Classes="Bordered"
-            ValueMemberBinding="{Binding Name,x:DataType=vm:StateData}" />
+            ValueMemberBinding="{Binding Name,DataType=vm:StateData}" />
         <AutoCompleteBox
             IsEnabled="False"
             PlaceholderText="Disabled"
-            ValueMemberBinding="{Binding Name,x:DataType=vm:StateData}" />
+            ValueMemberBinding="{Binding Name,DataType=vm:StateData}" />
         <AutoCompleteBox
             InnerLeftContent="https://"
             InnerRightContent=".com"
-            ValueMemberBinding="{Binding Name,x:DataType=vm:StateData}" />
+            ValueMemberBinding="{Binding Name,DataType=vm:StateData}" />
 
         <StackPanel Orientation="Horizontal">
             <AutoCompleteBox
                 Width="100"
                 Classes="Large"
                 PlaceholderText="Large"
-                ValueMemberBinding="{Binding Name,x:DataType=vm:StateData}" />
+                ValueMemberBinding="{Binding Name,DataType=vm:StateData}" />
             <AutoCompleteBox
                 Width="100"
                 PlaceholderText="Default"
-                ValueMemberBinding="{Binding Name,x:DataType=vm:StateData}" />
+                ValueMemberBinding="{Binding Name,DataType=vm:StateData}" />
             <AutoCompleteBox
                 Width="100"
                 Classes="Small"
                 PlaceholderText="Small"
-                ValueMemberBinding="{Binding Name,x:DataType=vm:StateData}" />
+                ValueMemberBinding="{Binding Name,DataType=vm:StateData}" />
         </StackPanel>
 
         <StackPanel Orientation="Horizontal">
@@ -70,17 +70,17 @@
                 Width="100"
                 IsEnabled="False"
                 PlaceholderText="Disabled"
-                ValueMemberBinding="{Binding Name,x:DataType=vm:StateData}" />
+                ValueMemberBinding="{Binding Name,DataType=vm:StateData}" />
             <AutoCompleteBox
                 Width="100"
                 Classes="Bordered"
                 PlaceholderText="Bordered"
-                ValueMemberBinding="{Binding Name,x:DataType=vm:StateData}" />
+                ValueMemberBinding="{Binding Name,DataType=vm:StateData}" />
             <AutoCompleteBox
                 Width="100"
                 Classes="Bordered"
                 IsEnabled="False"
-                ValueMemberBinding="{Binding Name,x:DataType=vm:StateData}" />
+                ValueMemberBinding="{Binding Name,DataType=vm:StateData}" />
         </StackPanel>
 
     </StackPanel>

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

@@ -50,7 +50,7 @@
             <TabbedPage Name="DemoTabs"
                         TabPlacement="Top"
                         SelectionChanged="OnSelectionChanged">
-                <ContentPage Header="Home">
+                <ContentPage Icon="{DynamicResource SemiIconHome}" Header="Home">
                     <StackPanel Margin="16" Spacing="8">
                         <TextBlock Text="Home Tab" FontSize="24" FontWeight="Bold" />
                         <TextBlock Text="Welcome to the Home tab. This is a TabbedPage sample."
@@ -59,14 +59,14 @@
                                    TextWrapping="Wrap" Opacity="0.7" />
                     </StackPanel>
                 </ContentPage>
-                <ContentPage Header="Search">
+                <ContentPage Icon="{DynamicResource SemiIconSearch}" Header="Search">
                     <StackPanel Margin="16" Spacing="8">
                         <TextBlock Text="Search Tab" FontSize="24" FontWeight="Bold" />
                         <TextBox PlaceholderText="Type to search..." />
                         <TextBlock Text="Search results will appear here." Opacity="0.7" />
                     </StackPanel>
                 </ContentPage>
-                <ContentPage Header="Settings">
+                <ContentPage Icon="{DynamicResource SemiIconSetting}" Header="Settings">
                     <StackPanel Margin="16" Spacing="8">
                         <TextBlock Text="Settings Tab" FontSize="24" FontWeight="Bold" />
                         <CheckBox Content="Enable notifications" />

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

@@ -3,7 +3,8 @@
              xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
              mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
-             x:Class="Semi.Avalonia.Demo.Pages.WindowCustomizationsPage">
+             x:Class="Semi.Avalonia.Demo.Pages.WindowCustomizationsPage"
+             x:CompileBindings="True">
 
     <StackPanel
         Spacing="10"

demo/Semi.Avalonia.Demo/Semi.Avalonia.Demo.csproj

@@ -3,6 +3,7 @@
         <TargetFramework>net8.0</TargetFramework>
         <Nullable>enable</Nullable>
         <LangVersion>latest</LangVersion>
+        <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
     </PropertyGroup>
 
     <ItemGroup>

src/Directory.Build.props

@@ -2,6 +2,7 @@
     <PropertyGroup>
         <Nullable>enable</Nullable>
         <LangVersion>latest</LangVersion>
+        <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
     </PropertyGroup>
 
     <PropertyGroup Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net8.0'))">

src/Semi.Avalonia.DataGrid/DataGrid.axaml

@@ -1,7 +1,8 @@
 <ResourceDictionary
     xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-    xmlns:collections="using:Avalonia.Collections">
+    xmlns:collections="using:Avalonia.Collections"
+    x:CompileBindings="True">
     <ControlTheme x:Key="DataGridCellTextBlockTheme" TargetType="TextBlock">
         <Setter Property="Margin" Value="{DynamicResource DataGridCellTextBlockDefaultMargin}" />
         <Setter Property="VerticalAlignment" Value="Center" />

src/Semi.Avalonia.TreeDataGrid/TreeDataGrid.axaml

@@ -1,7 +1,8 @@
 <ResourceDictionary
     xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-    xmlns:conv="clr-namespace:Avalonia.Controls.Converters;assembly=Avalonia.Controls.TreeDataGrid">
+    xmlns:conv="clr-namespace:Avalonia.Controls.Converters;assembly=Avalonia.Controls.TreeDataGrid"
+    x:CompileBindings="True">
     <Design.PreviewWith>
         <StackPanel Margin="20">
             <TreeDataGridColumnHeader Header="123" />

src/Semi.Avalonia/Controls/SplitView.axaml

@@ -1,6 +1,7 @@
 <ResourceDictionary 
     xmlns="https://github.com/avaloniaui" 
-    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    x:CompileBindings="True">
     <ControlTheme x:Key="{x:Type SplitView}" TargetType="SplitView">
         <Setter Property="OpenPaneLength" Value="{DynamicResource SplitViewOpenPaneThemeLength}" />
         <Setter Property="CompactPaneLength" Value="{DynamicResource SplitViewCompactPaneThemeLength}" />

src/Semi.Avalonia/Controls/TabItem.axaml

@@ -31,7 +31,6 @@
                     <DockPanel HorizontalSpacing="{DynamicResource TabItemIconHeaderSpacing}">
                         <ContentPresenter
                             Name="PART_IconPresenter"
-                            DockPanel.Dock="Left"
                             Content="{TemplateBinding Icon}"
                             ContentTemplate="{TemplateBinding IconTemplate}"
                             IsVisible="{Binding $self.Content, Converter={x:Static ObjectConverters.IsNotNull}}">
@@ -61,6 +60,10 @@
             <Setter Property="RecognizesAccessKey" Value="True" />
         </Style>
 
+        <Style Selector="^ /template/ ContentPresenter#PART_IconPresenter">
+            <Setter Property="DockPanel.Dock" Value="Left" />
+        </Style>
+
         <Style Selector="^:selected">
             <Style Selector="^ /template/ ContentPresenter#PART_HeaderPresenter">
                 <Setter Property="FontWeight" Value="{DynamicResource TabItemSelectedFontWeight}" />

src/Semi.Avalonia/Controls/TabbedPage.axaml

@@ -2,7 +2,11 @@
     xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <Design.PreviewWith>
-        <TabbedPage Width="400" Height="300" />
+        <TabbedPage Width="400" Height="800" TabPlacement="Bottom">
+            <ContentPage Icon="{DynamicResource SemiIconHome}" Header="Home" />
+            <ContentPage Icon="{DynamicResource SemiIconSearch}" Header="Search" />
+            <ContentPage Icon="{DynamicResource SemiIconSetting}" Header="Settings" />
+        </TabbedPage>
     </Design.PreviewWith>
 
     <ControlTheme x:Key="{x:Type TabbedPage}" TargetType="TabbedPage">
@@ -11,27 +15,91 @@
                 <TabControl
                     Name="PART_TabControl"
                     Background="{TemplateBinding Background}"
-                    Theme="{StaticResource LineTabControl}" />
+                    Theme="{StaticResource LineTabControl}">
+                    <TabControl.ItemContainerTheme>
+                        <ControlTheme
+                            BasedOn="{StaticResource LineTabItem}"
+                            TargetType="TabItem">
+                            <Style Selector="^[TabStripPlacement=Top], ^[TabStripPlacement=Bottom]">
+                                <Setter Property="TabItem.Margin" Value="0" />
+                                <Setter Property="TabItem.HorizontalContentAlignment" Value="Center" />
+                                <Setter Property="TabItem.VerticalContentAlignment" Value="Center" />
+                                <Style Selector="^ /template/ ContentPresenter#PART_IconPresenter">
+                                    <Setter Property="DockPanel.Dock" Value="Top" />
+                                </Style>
+                            </Style>
+                        </ControlTheme>
+                    </TabControl.ItemContainerTheme>
+                    <TabControl.ItemsPanel>
+                        <ItemsPanelTemplate>
+                            <UniformGrid Columns="{Binding $parent[TabControl].ItemCount}" />
+                        </ItemsPanelTemplate>
+                    </TabControl.ItemsPanel>
+                </TabControl>
             </ControlTemplate>
         </Setter>
     </ControlTheme>
+
     <ControlTheme x:Key="CardTabbedPage" TargetType="TabbedPage">
         <Setter Property="Template">
             <ControlTemplate TargetType="TabbedPage">
                 <TabControl
                     Name="PART_TabControl"
                     Background="{TemplateBinding Background}"
-                    Theme="{StaticResource CardTabControl}" />
+                    Theme="{StaticResource CardTabControl}">
+                    <TabControl.ItemContainerTheme>
+                        <ControlTheme
+                            BasedOn="{StaticResource CardTabItem}"
+                            TargetType="TabItem">
+                            <Style Selector="^[TabStripPlacement=Top], ^[TabStripPlacement=Bottom]">
+                                <Setter Property="TabItem.Padding" Value="8" />
+                                <Setter Property="TabItem.Margin" Value="0" />
+                                <Setter Property="TabItem.HorizontalContentAlignment" Value="Center" />
+                                <Setter Property="TabItem.VerticalContentAlignment" Value="Center" />
+                                <Style Selector="^ /template/ ContentPresenter#PART_IconPresenter">
+                                    <Setter Property="DockPanel.Dock" Value="Top" />
+                                </Style>
+                            </Style>
+                        </ControlTheme>
+                    </TabControl.ItemContainerTheme>
+                    <TabControl.ItemsPanel>
+                        <ItemsPanelTemplate>
+                            <UniformGrid Columns="{Binding $parent[TabControl].ItemCount}" />
+                        </ItemsPanelTemplate>
+                    </TabControl.ItemsPanel>
+                </TabControl>
             </ControlTemplate>
         </Setter>
     </ControlTheme>
+
     <ControlTheme x:Key="ButtonTabbedPage" TargetType="TabbedPage">
         <Setter Property="Template">
             <ControlTemplate TargetType="TabbedPage">
                 <TabControl
                     Name="PART_TabControl"
                     Background="{TemplateBinding Background}"
-                    Theme="{StaticResource ButtonTabControl}" />
+                    Theme="{StaticResource ButtonTabControl}">
+                    <TabControl.ItemContainerTheme>
+                        <ControlTheme
+                            BasedOn="{StaticResource ButtonTabItem}"
+                            TargetType="TabItem">
+                            <Style Selector="^[TabStripPlacement=Top], ^[TabStripPlacement=Bottom]">
+                                <Setter Property="TabItem.Padding" Value="12" />
+                                <Setter Property="TabItem.Margin" Value="0" />
+                                <Setter Property="TabItem.HorizontalContentAlignment" Value="Center" />
+                                <Setter Property="TabItem.VerticalContentAlignment" Value="Center" />
+                                <Style Selector="^ /template/ ContentPresenter#PART_IconPresenter">
+                                    <Setter Property="DockPanel.Dock" Value="Top" />
+                                </Style>
+                            </Style>
+                        </ControlTheme>
+                    </TabControl.ItemContainerTheme>
+                    <TabControl.ItemsPanel>
+                        <ItemsPanelTemplate>
+                            <UniformGrid Columns="{Binding $parent[TabControl].ItemCount}" />
+                        </ItemsPanelTemplate>
+                    </TabControl.ItemsPanel>
+                </TabControl>
             </ControlTemplate>
         </Setter>
     </ControlTheme>