From 975d14a36f8edce043036b43b31b19a8c1fb290b Mon Sep 17 00:00:00 2001
From: rabbitism <dongbin@irihi.tech>
Date: Sat, 4 Oct 2025 10:48:38 +0800
Subject: [PATCH] feat: upgrade to 11.3.7, implement splitview changes.

---
 demo/Directory.Build.props                    |   4 +-
 .../Pages/SplitViewDemo.axaml                 | 355 +++++++-----------
 .../ViewModels/SplitViewDemoViewModel.cs      |   8 +
 src/Package.props                             |   2 +-
 src/Semi.Avalonia/Controls/SplitView.axaml    | 261 ++++++++++++-
 5 files changed, 402 insertions(+), 228 deletions(-)

diff --git a/demo/Directory.Build.props b/demo/Directory.Build.props
index 9b0eef8..a89d1ff 100644
--- a/demo/Directory.Build.props
+++ b/demo/Directory.Build.props
@@ -1,7 +1,7 @@
 <Project>
     <PropertyGroup>
-        <AvaloniaVersion>11.3.0</AvaloniaVersion>
-        <DataGridVersion>11.3.0</DataGridVersion>
+        <AvaloniaVersion>11.3.7</AvaloniaVersion>
+        <DataGridVersion>11.3.7</DataGridVersion>
         <CommunityToolkitVersion>8.4.0</CommunityToolkitVersion>
     </PropertyGroup>
 </Project>
diff --git a/demo/Semi.Avalonia.Demo/Pages/SplitViewDemo.axaml b/demo/Semi.Avalonia.Demo/Pages/SplitViewDemo.axaml
index bd8fb68..ce8424a 100644
--- a/demo/Semi.Avalonia.Demo/Pages/SplitViewDemo.axaml
+++ b/demo/Semi.Avalonia.Demo/Pages/SplitViewDemo.axaml
@@ -7,277 +7,186 @@
     xmlns:vm="clr-namespace:Semi.Avalonia.Demo.ViewModels"
     d:DesignHeight="1000"
     d:DesignWidth="800"
-    mc:Ignorable="d"
-    x:DataType="vm:SplitViewDemoViewModel">
+    x:DataType="vm:SplitViewDemoViewModel"
+    mc:Ignorable="d">
     <Design.DataContext>
         <vm:SplitViewDemoViewModel />
     </Design.DataContext>
     <Border>
         <Grid ColumnDefinitions="*,400">
-            <Border Grid.Column="1" VerticalAlignment="Top" Margin="10 0 0 0">
-                <Grid RowDefinitions="*, *, *, *, *, *" ColumnDefinitions="Auto, *">
+            <Border
+                Grid.Column="1"
+                Margin="10,0,0,0"
+                VerticalAlignment="Top">
+                <Grid ColumnDefinitions="Auto, *" RowDefinitions="*, *, *, *, *, *">
                     <Label
-                        Grid.Row="0" Grid.Column="0"
+                        Grid.Row="0"
+                        Grid.Column="0"
                         VerticalAlignment="Center"
                         Content="IsPaneOpen" />
                     <ToggleSwitch
-                        Grid.Row="0" Grid.Column="1"
-                        Name="PaneOpenButton" />
+                        Name="PaneOpenButton"
+                        Grid.Row="0"
+                        Grid.Column="1" />
 
                     <Label
-                        Grid.Row="1" Grid.Column="0"
+                        Grid.Row="1"
+                        Grid.Column="0"
                         VerticalAlignment="Center"
                         Content="UseLightDismissOverlayMode" />
                     <ToggleSwitch
-                        Grid.Row="1" Grid.Column="1"
-                        Name="UseLightDismissOverlayModeButton" />
+                        Name="UseLightDismissOverlayModeButton"
+                        Grid.Row="1"
+                        Grid.Column="1" />
 
                     <Label
-                        Grid.Row="2" Grid.Column="0"
+                        Grid.Row="2"
+                        Grid.Column="0"
                         VerticalAlignment="Center"
                         Content="Placement" />
-                    <ToggleSwitch
-                        Grid.Row="2" Grid.Column="1"
-                        Name="PanePlacementButton"
-                        OffContent="Left"
-                        OnContent="Right" />
-
+                    <ComboBox 
+                        Grid.Row="2" 
+                        Grid.Column="1" 
+                        Name="PanelPlacementSelector"
+                        ItemsSource="{x:Static vm:SplitViewDemoViewModel.Placements}"
+                        SelectedItem="{x:Static SplitViewPanePlacement.Left}"
+                        />
                     <Label
-                        Grid.Row="3" Grid.Column="0"
+                        Grid.Row="3"
+                        Grid.Column="0"
                         VerticalAlignment="Center"
                         Content="DisplayMode" />
                     <ComboBox
-                        Grid.Row="3" Grid.Column="1"
                         Name="DisplayModeSelector"
+                        Grid.Row="3"
+                        Grid.Column="1"
                         HorizontalAlignment="Stretch"
                         ItemsSource="{x:Static vm:SplitViewDemoViewModel.DisplayModes}"
                         SelectedItem="{x:Static SplitViewDisplayMode.CompactInline}" />
 
                     <Label
-                        Grid.Row="4" Grid.Column="0"
+                        Grid.Row="4"
+                        Grid.Column="0"
                         VerticalAlignment="Center"
                         Content="{Binding #CompactPaneLengthSlider.Value, StringFormat='{}CompactPaneLength: {0}'}" />
                     <Slider
-                        Grid.Row="4" Grid.Column="1"
                         Name="CompactPaneLengthSlider"
+                        Grid.Row="4"
+                        Grid.Column="1"
+                        IsSnapToTickEnabled="True"
                         Maximum="128"
                         Minimum="0"
                         TickFrequency="1"
-                        IsSnapToTickEnabled="True"
                         Value="48" />
 
                     <Label
-                        Grid.Row="5" Grid.Column="0"
+                        Grid.Row="5"
+                        Grid.Column="0"
                         VerticalAlignment="Center"
-                        Content="{Binding #OpenPaneLengthSlider.Value,StringFormat='{}OpenPaneLength: {0}'}" />
+                        Content="{Binding #OpenPaneLengthSlider.Value, StringFormat='{}OpenPaneLength: {0}'}" />
                     <Slider
-                        Grid.Row="5" Grid.Column="1"
                         Name="OpenPaneLengthSlider"
+                        Grid.Row="5"
+                        Grid.Column="1"
+                        IsSnapToTickEnabled="True"
                         Maximum="500"
                         Minimum="128"
                         TickFrequency="1"
-                        IsSnapToTickEnabled="True"
                         Value="256" />
                 </Grid>
             </Border>
-            <TabControl Grid.Column="0">
-                <TabItem Header="Default">
-                    <Border
-                        BorderBrush="{DynamicResource SemiGrey1}"
-                        BorderThickness="1">
-                        <SplitView
-                            Name="SplitView"
-                            IsPaneOpen="{Binding #PaneOpenButton.IsChecked,Mode=TwoWay}"
-                            UseLightDismissOverlayMode="{Binding #UseLightDismissOverlayModeButton.IsChecked}"
-                            PanePlacement="{Binding #PanePlacementButton.IsChecked}"
-                            DisplayMode="{Binding #DisplayModeSelector.SelectedItem}"
-                            CompactPaneLength="{Binding #CompactPaneLengthSlider.Value}"
-                            OpenPaneLength="{Binding #OpenPaneLengthSlider.Value}">
-                            <SplitView.Background>
-                                <LinearGradientBrush StartPoint="0%,0%" EndPoint="0%,100%">
-                                    <GradientStop Color="#6b4c1b" Offset="0" />
-                                    <GradientStop Color="#291e10" Offset="1" />
-                                </LinearGradientBrush>
-                            </SplitView.Background>
-                            <SplitView.Pane>
-                                <Grid RowDefinitions="Auto,*,Auto">
-                                    <TextBlock
-                                        Grid.Row="0"
-                                        Name="PaneHeader"
-                                        Margin="8,12"
-                                        FontWeight="Bold"
-                                        Text="Playlist" />
-                                    <ListBox
-                                        Grid.Row="1"
-                                        ItemsSource="{Binding Songs}" />
-                                    <ToggleSwitch
-                                        Grid.Row="2"
-                                        Theme="{DynamicResource IconBorderlessToggleSwitch}"
-                                        Content="{StaticResource SemiIconSidebar}"
-                                        HorizontalAlignment="Left"
-                                        IsChecked="{Binding #SplitView.IsPaneOpen}" />
-                                </Grid>
-                            </SplitView.Pane>
+            <SplitView
+                Grid.Column="0"
+                Name="SplitView"
+                CompactPaneLength="{Binding #CompactPaneLengthSlider.Value}"
+                DisplayMode="{Binding #DisplayModeSelector.SelectedItem}"
+                IsPaneOpen="{Binding #PaneOpenButton.IsChecked, Mode=TwoWay}"
+                OpenPaneLength="{Binding #OpenPaneLengthSlider.Value}"
+                PanePlacement="{Binding #PanelPlacementSelector.SelectedItem}"
+                UseLightDismissOverlayMode="{Binding #UseLightDismissOverlayModeButton.IsChecked}">
+                <SplitView.Background>
+                    <LinearGradientBrush StartPoint="0%,0%" EndPoint="0%,100%">
+                        <GradientStop Offset="0" Color="#6b4c1b" />
+                        <GradientStop Offset="1" Color="#291e10" />
+                    </LinearGradientBrush>
+                </SplitView.Background>
+                <SplitView.Pane>
+                    <Grid RowDefinitions="Auto,*,Auto">
+                        <StackPanel Grid.Row="0" Orientation="Horizontal" Margin="8 12">
+                            <ToggleSwitch
+                                Content="{StaticResource SemiIconSidebar}"
+                                IsChecked="{Binding #SplitView.IsPaneOpen}"
+                                Theme="{DynamicResource IconBorderlessToggleSwitch}" />
+                            <TextBlock
+                                Name="PaneHeader"
+                                VerticalAlignment="Center"
+                                Margin="8 0"
+                                FontWeight="Bold"
+                                Text="Playlist" />
+                        </StackPanel>
+                        
+                        <ListBox Grid.Row="1" ItemsSource="{Binding Songs}" />
+                        
+                    </Grid>
+                </SplitView.Pane>
 
-                            <Panel>
-                                <Panel.Styles>
-                                    <Style Selector="Image#AlbumCover">
-                                        <Style.Animations>
-                                            <Animation IterationCount="Infinite" Duration="0:0:40">
-                                                <KeyFrame Cue="0%">
-                                                    <Setter Property="RotateTransform.Angle" Value="0" />
-                                                </KeyFrame>
-                                                <KeyFrame Cue="100%">
-                                                    <Setter Property="RotateTransform.Angle" Value="360" />
-                                                </KeyFrame>
-                                            </Animation>
-                                        </Style.Animations>
-                                    </Style>
-                                </Panel.Styles>
-                                <Image
-                                    Source="/Assets/WORLD.png"
-                                    Name="AlbumCover"
-                                    Width="200"
-                                    Height="200" />
-                                <Arc
-                                    Width="290"
-                                    Height="290"
-                                    StartAngle="0"
-                                    SweepAngle="360"
-                                    StrokeJoin="Round"
-                                    StrokeLineCap="Round"
-                                    StrokeThickness="45">
-                                    <Arc.Stroke>
-                                        <LinearGradientBrush StartPoint="0%,0%" EndPoint="100%,0%">
-                                            <GradientStop Color="#010101" Offset="0" />
-                                            <GradientStop Color="#363636" Offset="0.5" />
-                                            <GradientStop Color="#010101" Offset="1" />
-                                        </LinearGradientBrush>
-                                    </Arc.Stroke>
-                                </Arc>
-                                <Arc
-                                    Width="294"
-                                    Height="294"
-                                    StartAngle="0"
-                                    SweepAngle="360"
-                                    StrokeJoin="Round"
-                                    StrokeLineCap="Round"
-                                    StrokeThickness="4"
-                                    Stroke="Black" />
-                                <Arc
-                                    Width="310"
-                                    Height="310"
-                                    StartAngle="0"
-                                    SweepAngle="360"
-                                    StrokeJoin="Round"
-                                    StrokeLineCap="Round"
-                                    StrokeThickness="10"
-                                    Stroke="#C6CACD"
-                                    Opacity="0.1" />
-                            </Panel>
-
-                        </SplitView>
-                    </Border>
-                </TabItem>
-                <TabItem Header="VerticalSplitView">
-                    <Border
-                        BorderBrush="{DynamicResource SemiGrey1}"
-                        BorderThickness="1">
-                        <SplitView
-                            Name="SplitView2"
-                            Theme="{DynamicResource VerticalSplitView}"
-                            IsPaneOpen="{Binding #PaneOpenButton.IsChecked,Mode=TwoWay}"
-                            UseLightDismissOverlayMode="{Binding #UseLightDismissOverlayModeButton.IsChecked}"
-                            PanePlacement="{Binding #PanePlacementButton.IsChecked}"
-                            DisplayMode="{Binding #DisplayModeSelector.SelectedItem}"
-                            CompactPaneLength="{Binding #CompactPaneLengthSlider.Value}"
-                            OpenPaneLength="{Binding #OpenPaneLengthSlider.Value}">
-                            <SplitView.Background>
-                                <LinearGradientBrush StartPoint="0%,0%" EndPoint="0%,100%">
-                                    <GradientStop Color="#6b4c1b" Offset="0" />
-                                    <GradientStop Color="#291e10" Offset="1" />
-                                </LinearGradientBrush>
-                            </SplitView.Background>
-                            <SplitView.Pane>
-                                <Grid RowDefinitions="Auto,Auto,*">
-                                    <ToggleSwitch
-                                        Grid.Row="0"
-                                        Theme="{DynamicResource IconBorderlessToggleSwitch}"
-                                        Content="{StaticResource SemiIconSidebar}"
-                                        HorizontalAlignment="Left"
-                                        IsChecked="{Binding #SplitView2.IsPaneOpen}" />
-                                    <TextBlock
-                                        Grid.Row="1"
-                                        Margin="8,12"
-                                        FontWeight="Bold"
-                                        Text="Playlist" />
-                                    <ListBox
-                                        Grid.Row="2"
-                                        ItemsSource="{Binding Songs}" />
-                                </Grid>
-                            </SplitView.Pane>
-
-                            <Panel>
-                                <Panel.Styles>
-                                    <Style Selector="Image#AlbumCover2">
-                                        <Style.Animations>
-                                            <Animation IterationCount="Infinite" Duration="0:0:40">
-                                                <KeyFrame Cue="0%">
-                                                    <Setter Property="RotateTransform.Angle" Value="0" />
-                                                </KeyFrame>
-                                                <KeyFrame Cue="100%">
-                                                    <Setter Property="RotateTransform.Angle" Value="360" />
-                                                </KeyFrame>
-                                            </Animation>
-                                        </Style.Animations>
-                                    </Style>
-                                </Panel.Styles>
-                                <Image
-                                    Source="/Assets/WORLD.png"
-                                    Name="AlbumCover2"
-                                    Width="200"
-                                    Height="200" />
-                                <Arc
-                                    Width="290"
-                                    Height="290"
-                                    StartAngle="0"
-                                    SweepAngle="360"
-                                    StrokeJoin="Round"
-                                    StrokeLineCap="Round"
-                                    StrokeThickness="45">
-                                    <Arc.Stroke>
-                                        <LinearGradientBrush StartPoint="0%,0%" EndPoint="100%,0%">
-                                            <GradientStop Color="#010101" Offset="0" />
-                                            <GradientStop Color="#363636" Offset="0.5" />
-                                            <GradientStop Color="#010101" Offset="1" />
-                                        </LinearGradientBrush>
-                                    </Arc.Stroke>
-                                </Arc>
-                                <Arc
-                                    Width="294"
-                                    Height="294"
-                                    StartAngle="0"
-                                    SweepAngle="360"
-                                    StrokeJoin="Round"
-                                    StrokeLineCap="Round"
-                                    StrokeThickness="4"
-                                    Stroke="Black" />
-                                <Arc
-                                    Width="310"
-                                    Height="310"
-                                    StartAngle="0"
-                                    SweepAngle="360"
-                                    StrokeJoin="Round"
-                                    StrokeLineCap="Round"
-                                    StrokeThickness="10"
-                                    Stroke="#C6CACD"
-                                    Opacity="0.1" />
-                            </Panel>
-
-                        </SplitView>
-                    </Border>
-                </TabItem>
-            </TabControl>
+                <Panel>
+                    <Panel.Styles>
+                        <Style Selector="Image#AlbumCover">
+                            <Style.Animations>
+                                <Animation IterationCount="Infinite" Duration="0:0:40">
+                                    <KeyFrame Cue="0%">
+                                        <Setter Property="RotateTransform.Angle" Value="0" />
+                                    </KeyFrame>
+                                    <KeyFrame Cue="100%">
+                                        <Setter Property="RotateTransform.Angle" Value="360" />
+                                    </KeyFrame>
+                                </Animation>
+                            </Style.Animations>
+                        </Style>
+                    </Panel.Styles>
+                    <Image
+                        Name="AlbumCover"
+                        Width="200"
+                        Height="200"
+                        Source="/Assets/WORLD.png" />
+                    <Arc
+                        Width="290"
+                        Height="290"
+                        StartAngle="0"
+                        StrokeJoin="Round"
+                        StrokeLineCap="Round"
+                        StrokeThickness="45"
+                        SweepAngle="360">
+                        <Arc.Stroke>
+                            <LinearGradientBrush StartPoint="0%,0%" EndPoint="100%,0%">
+                                <GradientStop Offset="0" Color="#010101" />
+                                <GradientStop Offset="0.5" Color="#363636" />
+                                <GradientStop Offset="1" Color="#010101" />
+                            </LinearGradientBrush>
+                        </Arc.Stroke>
+                    </Arc>
+                    <Arc
+                        Width="294"
+                        Height="294"
+                        StartAngle="0"
+                        Stroke="Black"
+                        StrokeJoin="Round"
+                        StrokeLineCap="Round"
+                        StrokeThickness="4"
+                        SweepAngle="360" />
+                    <Arc
+                        Width="310"
+                        Height="310"
+                        Opacity="0.1"
+                        StartAngle="0"
+                        Stroke="#C6CACD"
+                        StrokeJoin="Round"
+                        StrokeLineCap="Round"
+                        StrokeThickness="10"
+                        SweepAngle="360" />
+                </Panel>
+            </SplitView>
         </Grid>
     </Border>
 </UserControl>
\ No newline at end of file
diff --git a/demo/Semi.Avalonia.Demo/ViewModels/SplitViewDemoViewModel.cs b/demo/Semi.Avalonia.Demo/ViewModels/SplitViewDemoViewModel.cs
index a351142..4709201 100644
--- a/demo/Semi.Avalonia.Demo/ViewModels/SplitViewDemoViewModel.cs
+++ b/demo/Semi.Avalonia.Demo/ViewModels/SplitViewDemoViewModel.cs
@@ -26,4 +26,12 @@ public class SplitViewDemoViewModel : ObservableObject
         SplitViewDisplayMode.Overlay,
         SplitViewDisplayMode.CompactOverlay,
     ];
+
+    public static ObservableCollection<SplitViewPanePlacement> Placements { get; set; } =
+    [
+        SplitViewPanePlacement.Left,
+        SplitViewPanePlacement.Right,
+        SplitViewPanePlacement.Top,
+        SplitViewPanePlacement.Bottom
+    ];
 }
\ No newline at end of file
diff --git a/src/Package.props b/src/Package.props
index d4e1d35..ddfa884 100644
--- a/src/Package.props
+++ b/src/Package.props
@@ -10,7 +10,7 @@
         <PackageLicenseExpression>MIT</PackageLicenseExpression>
         <PackageIcon>irihi.png</PackageIcon>
         <PackageProjectUrl>https://github.com/irihitech/Semi.Avalonia</PackageProjectUrl>
-        <AvaloniaVersion>11.2.1</AvaloniaVersion>
+        <AvaloniaVersion>11.3.7</AvaloniaVersion>
         <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
     </PropertyGroup>
 
diff --git a/src/Semi.Avalonia/Controls/SplitView.axaml b/src/Semi.Avalonia/Controls/SplitView.axaml
index def5fc9..198bad8 100644
--- a/src/Semi.Avalonia/Controls/SplitView.axaml
+++ b/src/Semi.Avalonia/Controls/SplitView.axaml
@@ -184,9 +184,198 @@
                 </Style>
             </Style>
         </Style>
+        
+        <Style Selector="^:top">
+            <Setter Property="Template">
+                <ControlTemplate TargetType="SplitView">
+                    <Grid Name="Container" Background="{TemplateBinding Background}">
+                        <Grid.RowDefinitions>
+                            <!--  why is this throwing a binding error?  -->
+                            <RowDefinition
+                                Height="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.PaneColumnGridLength}" />
+                            <RowDefinition Height="*" />
+                        </Grid.RowDefinitions>
+
+                        <Panel
+                            Name="PART_PaneRoot"
+                            VerticalAlignment="Top"
+                            Background="{TemplateBinding PaneBackground}"
+                            ClipToBounds="True"
+                            ZIndex="100">
+                            <ContentPresenter
+                                Name="PART_PanePresenter"
+                                Content="{TemplateBinding Pane}"
+                                ContentTemplate="{TemplateBinding PaneTemplate}" />
+                            <Rectangle
+                                Name="HCPaneBorder"
+                                Height="1"
+                                VerticalAlignment="Bottom"
+                                Fill="{DynamicResource SplitViewSeparatorBackground}" />
+                        </Panel>
+
+                        <Panel Name="ContentRoot">
+                            <ContentPresenter
+                                Name="PART_ContentPresenter"
+                                Content="{TemplateBinding Content}"
+                                ContentTemplate="{TemplateBinding ContentTemplate}" />
+                            <Rectangle
+                                Name="LightDismissLayer"
+                                Fill="Transparent"
+                                IsVisible="False" />
+                        </Panel>
+
+                    </Grid>
+                </ControlTemplate>
+            </Setter>
+
+            <Style Selector="^:overlay">
+                <Style Selector="^ /template/ Panel#PART_PaneRoot">
+                    <Setter Property="Height"
+                            Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.ClosedPaneWidth}" />
+                    <Setter Property="Grid.RowSpan" Value="1" />
+                    <Setter Property="Grid.Row" Value="0" />
+                </Style>
+                <Style Selector="^ /template/ Panel#ContentRoot">
+                    <Setter Property="Grid.Row" Value="1" />
+                    <Setter Property="Grid.RowSpan" Value="2" />
+                </Style>
+            </Style>
+
+            <Style Selector="^:compactinline">
+                <Style Selector="^ /template/ Panel#PART_PaneRoot">
+                    <Setter Property="Grid.RowSpan" Value="1" />
+                    <Setter Property="Grid.Row" Value="0" />
+                    <Setter Property="Height"
+                            Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.ClosedPaneWidth}" />
+                </Style>
+                <Style Selector="^ /template/ Panel#ContentRoot">
+                    <Setter Property="Grid.Row" Value="1" />
+                    <Setter Property="Grid.RowSpan" Value="1" />
+                </Style>
+            </Style>
+
+            <Style Selector="^:compactoverlay">
+                <Style Selector="^ /template/ Panel#PART_PaneRoot">
+                    <!--  RowSpan should be 2  -->
+                    <Setter Property="Grid.RowSpan" Value="1" />
+                    <Setter Property="Grid.Row" Value="0" />
+                    <Setter Property="Height"
+                            Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.ClosedPaneWidth}" />
+                </Style>
+                <Style Selector="^ /template/ Panel#ContentRoot">
+                    <Setter Property="Grid.Row" Value="1" />
+                    <Setter Property="Grid.RowSpan" Value="1" />
+                </Style>
+            </Style>
+
+            <Style Selector="^:inline">
+                <Style Selector="^ /template/ Panel#PART_PaneRoot">
+                    <Setter Property="Grid.RowSpan" Value="1" />
+                    <Setter Property="Grid.Row" Value="0" />
+                    <Setter Property="Height"
+                            Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.ClosedPaneWidth}" />
+                </Style>
+                <Style Selector="^ /template/ Panel#ContentRoot">
+                    <Setter Property="Grid.Row" Value="1" />
+                    <Setter Property="Grid.RowSpan" Value="1" />
+                </Style>
+            </Style>
+        </Style>
+
+        <Style Selector="^:bottom">
+            <Setter Property="Template">
+                <ControlTemplate>
+                    <Grid Name="Container" Background="{TemplateBinding Background}">
+                        <Grid.RowDefinitions>
+                            <RowDefinition Height="*" />
+                            <RowDefinition
+                                Height="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.PaneColumnGridLength}" />
+                        </Grid.RowDefinitions>
+
+                        <Panel
+                            Name="PART_PaneRoot"
+                            VerticalAlignment="Bottom"
+                            Background="{TemplateBinding PaneBackground}"
+                            ClipToBounds="True"
+                            ZIndex="100">
+                            <ContentPresenter
+                                Name="PART_PanePresenter"
+                                Content="{TemplateBinding Pane}"
+                                ContentTemplate="{TemplateBinding PaneTemplate}" />
+                            <Rectangle
+                                Name="HCPaneBorder"
+                                Height="1"
+                                VerticalAlignment="Top"
+                                Fill="{DynamicResource SplitViewSeparatorBackground}" />
+                        </Panel>
+
+                        <Panel Name="ContentRoot">
+                            <ContentPresenter
+                                Name="PART_ContentPresenter"
+                                Content="{TemplateBinding Content}"
+                                ContentTemplate="{TemplateBinding ContentTemplate}" />
+                            <Rectangle Name="LightDismissLayer" IsVisible="False" />
+                        </Panel>
+
+                    </Grid>
+                </ControlTemplate>
+            </Setter>
+
+            <Style Selector="^:overlay">
+                <Style Selector="^ /template/ Panel#PART_PaneRoot">
+                    <Setter Property="Height"
+                            Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.ClosedPaneWidth}" />
+                    <Setter Property="Grid.RowSpan" Value="2" />
+                    <Setter Property="Grid.Row" Value="1" />
+                </Style>
+                <Style Selector="^ /template/ Panel#ContentRoot">
+                    <Setter Property="Grid.Row" Value="0" />
+                    <Setter Property="Grid.RowSpan" Value="2" />
+                </Style>
+            </Style>
+
+            <Style Selector="^:compactinline">
+                <Style Selector="^ /template/ Panel#PART_PaneRoot">
+                    <Setter Property="Grid.RowSpan" Value="1" />
+                    <Setter Property="Grid.Row" Value="1" />
+                    <Setter Property="Height"
+                            Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.ClosedPaneWidth}" />
+                </Style>
+                <Style Selector="^ /template/ Panel#ContentRoot">
+                    <Setter Property="Grid.Row" Value="0" />
+                    <Setter Property="Grid.RowSpan" Value="1" />
+                </Style>
+            </Style>
+
+            <Style Selector="^:compactoverlay">
+                <Style Selector="^ /template/ Panel#PART_PaneRoot">
+                    <Setter Property="Grid.RowSpan" Value="2" />
+                    <Setter Property="Grid.Row" Value="1" />
+                    <Setter Property="Height"
+                            Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.ClosedPaneWidth}" />
+                </Style>
+                <Style Selector="^ /template/ Panel#ContentRoot">
+                    <Setter Property="Grid.Row" Value="0" />
+                    <Setter Property="Grid.RowSpan" Value="1" />
+                </Style>
+            </Style>
+
+            <Style Selector="^:inline">
+                <Style Selector="^ /template/ Panel#PART_PaneRoot">
+                    <Setter Property="Grid.RowSpan" Value="1" />
+                    <Setter Property="Grid.Row" Value="1" />
+                    <Setter Property="Height"
+                            Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.ClosedPaneWidth}" />
+                </Style>
+                <Style Selector="^ /template/ Panel#ContentRoot">
+                    <Setter Property="Grid.Row" Value="0" />
+                    <Setter Property="Grid.RowSpan" Value="1" />
+                </Style>
+            </Style>
+        </Style>
 
         <Style Selector="^:open">
-            <Style Selector="^ /template/ Panel#PART_PaneRoot">
+            <Style Selector="^:left /template/ Panel#PART_PaneRoot">
                 <Setter Property="Transitions">
                     <Transitions>
                         <DoubleTransition
@@ -197,6 +386,39 @@
                 </Setter>
                 <Setter Property="Width" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=OpenPaneLength}" />
             </Style>
+            <Style Selector="^:right /template/ Panel#PART_PaneRoot">
+                <Setter Property="Transitions">
+                    <Transitions>
+                        <DoubleTransition
+                            Easing="{StaticResource SplitViewPaneAnimationEasing}"
+                            Property="Width"
+                            Duration="{StaticResource SplitViewPaneAnimationOpenDuration}" />
+                    </Transitions>
+                </Setter>
+                <Setter Property="Width" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=OpenPaneLength}" />
+            </Style>
+            <Style Selector="^:top /template/ Panel#PART_PaneRoot">
+                <Setter Property="Transitions">
+                    <Transitions>
+                        <DoubleTransition
+                            Easing="{StaticResource SplitViewPaneAnimationEasing}"
+                            Property="Height"
+                            Duration="{StaticResource SplitViewPaneAnimationOpenDuration}" />
+                    </Transitions>
+                </Setter>
+                <Setter Property="Height" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=OpenPaneLength}" />
+            </Style>
+            <Style Selector="^:bottom /template/ Panel#PART_PaneRoot">
+                <Setter Property="Transitions">
+                    <Transitions>
+                        <DoubleTransition
+                            Easing="{StaticResource SplitViewPaneAnimationEasing}"
+                            Property="Height"
+                            Duration="{StaticResource SplitViewPaneAnimationOpenDuration}" />
+                    </Transitions>
+                </Setter>
+                <Setter Property="Height" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=OpenPaneLength}" />
+            </Style>
             <Style Selector="^ /template/ Rectangle#LightDismissLayer">
                 <Setter Property="Transitions">
                     <Transitions>
@@ -211,7 +433,7 @@
         </Style>
 
         <Style Selector="^:closed">
-            <Style Selector="^ /template/ Panel#PART_PaneRoot">
+            <Style Selector="^:left /template/ Panel#PART_PaneRoot">
                 <Setter Property="Transitions">
                     <Transitions>
                         <DoubleTransition
@@ -222,6 +444,39 @@
                 </Setter>
                 <Setter Property="Width" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.ClosedPaneWidth}" />
             </Style>
+            <Style Selector="^:right /template/ Panel#PART_PaneRoot">
+                <Setter Property="Transitions">
+                    <Transitions>
+                        <DoubleTransition
+                            Easing="{StaticResource SplitViewPaneAnimationEasing}"
+                            Property="Width"
+                            Duration="{StaticResource SplitViewPaneAnimationCloseDuration}" />
+                    </Transitions>
+                </Setter>
+                <Setter Property="Width" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.ClosedPaneWidth}" />
+            </Style>
+            <Style Selector="^:top /template/ Panel#PART_PaneRoot">
+                <Setter Property="Transitions">
+                    <Transitions>
+                        <DoubleTransition
+                            Easing="{StaticResource SplitViewPaneAnimationEasing}"
+                            Property="Height"
+                            Duration="{StaticResource SplitViewPaneAnimationCloseDuration}" />
+                    </Transitions>
+                </Setter>
+                <Setter Property="Height" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.ClosedPaneWidth}" />
+            </Style>
+            <Style Selector="^:bottom /template/ Panel#PART_PaneRoot">
+                <Setter Property="Transitions">
+                    <Transitions>
+                        <DoubleTransition
+                            Easing="{StaticResource SplitViewPaneAnimationEasing}"
+                            Property="Height"
+                            Duration="{StaticResource SplitViewPaneAnimationCloseDuration}" />
+                    </Transitions>
+                </Setter>
+                <Setter Property="Height" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.ClosedPaneWidth}" />
+            </Style>
             <Style Selector="^ /template/ Rectangle#LightDismissLayer">
                 <Setter Property="Transitions">
                     <Transitions>
@@ -245,6 +500,8 @@
             <Setter Property="IsVisible" Value="True" />
         </Style>
     </ControlTheme>
+    
+    <!-- Obsolete after Avalonia 11.3.7 -->
     <ControlTheme x:Key="VerticalSplitView" TargetType="SplitView">
         <Setter Property="OpenPaneLength" Value="{DynamicResource SplitViewOpenPaneThemeLength}" />
         <Setter Property="CompactPaneLength" Value="{DynamicResource SplitViewCompactPaneThemeLength}" />