chore: stretch the combo box.

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

@@ -12,7 +12,7 @@
             <ScrollViewer DockPanel.Dock="Right" Width="260">
                 <StackPanel Margin="12" Spacing="8">
                     <TextBlock Text="Configuration" FontWeight="SemiBold" FontSize="16" />
-                    <TextBlock Text="Navigation" FontWeight="SemiBold" FontSize="13" />
+                    <TextBlock Text="Navigation" FontWeight="SemiBold" FontSize="14" />
 
                     <Button Content="Push Page"
                             HorizontalAlignment="Stretch"
@@ -26,6 +26,20 @@
 
                     <Separator />
 
+                    <TextBlock Text="Modal Actions" FontWeight="SemiBold" FontSize="14" />
+                    <Button Name="PushModalButton"
+                            Content="Push Modal"
+                            HorizontalAlignment="Stretch"
+                            Click="OnPushModal" />
+                    <Button Name="PopModalButton"
+                            Content="Pop Modal"
+                            HorizontalAlignment="Stretch"
+                            Click="OnPopModal" />
+                    <Button Name="PopAllModalsButton"
+                            Content="Pop All Modals"
+                            HorizontalAlignment="Stretch"
+                            Click="OnPopAllModals" />
+
                     <TextBlock Text="Options" FontWeight="SemiBold" FontSize="14" />
 
                     <CheckBox Name="HasNavBarCheck"
@@ -34,21 +48,39 @@
                               IsCheckedChanged="OnHasNavBarChanged" />
                     <CheckBox Name="HasBackButtonCheck"
                               Content="Has Back Button"
-                              IsChecked="True" 
+                              IsChecked="True"
-                              IsCheckedChanged="OnHasBackButonChanged" />
+                              IsCheckedChanged="OnHasBackButtonChanged" />
+                    <CheckBox Name="HasShadowCheck"
+                              Content="Has Shadow"
+                              IsChecked="True"
+                              IsCheckedChanged="OnHasShadowChanged" />
+                    <CheckBox Name="large" Content="Large" />
+
+                    <Separator />
+
+                    <TextBlock Text="Modal Transition" FontWeight="SemiBold" FontSize="14" />
+                    <ComboBox Name="TransitionCombo"
+                              SelectedIndex="0"
+                              HorizontalAlignment="Stretch"
+                              SelectionChanged="OnTransitionChanged">
+                        <ComboBoxItem Content="Slide from Bottom" />
+                        <ComboBoxItem Content="CrossFade" />
+                        <ComboBoxItem Content="None" />
+                    </ComboBox>
 
                     <Separator />
 
                     <TextBlock Text="Status" FontWeight="SemiBold" FontSize="14" />
                     <TextBlock Name="StatusText"
                                Text="Depth: 1"
-                               Opacity="0.7"
                                TextWrapping="Wrap" />
                     <TextBlock Name="HeaderText"
                                Text="Current: Home"
-                               Opacity="0.7"
                                TextWrapping="Wrap" />
-                    <ToggleSwitch Content="Large" Name="large" />
+                    <TextBlock Name="ModalText"
+                               Text="Modals: 0"
+                               TextWrapping="Wrap" />
+
                 </StackPanel>
             </ScrollViewer>
 
@@ -59,8 +91,8 @@
                     BorderThickness="1"
                     CornerRadius="6"
                     ClipToBounds="True">
-                <NavigationPage 
+                <NavigationPage
-                    Name="DemoNav" 
+                    Name="DemoNav"
                     Classes.Large="{Binding #large.IsChecked}" />
             </Border>
         </DockPanel>

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

@@ -1,3 +1,5 @@
+using System;
+using Avalonia.Animation;
 using Avalonia.Controls;
 using Avalonia.Interactivity;
 
@@ -6,6 +8,7 @@ namespace Semi.Avalonia.Demo.Pages;
 public partial class NavigationPageDemo : UserControl
 {
     private int _pageCount;
+    private int _modalCount;
 
     public NavigationPageDemo()
     {
@@ -15,7 +18,7 @@ public partial class NavigationPageDemo : UserControl
 
     private async void OnLoaded(object? sender, RoutedEventArgs e)
     {
-        await DemoNav.PushAsync(NavigationDemoHelper.MakePage("Home", "Welcome!\nUse the buttons to push and pop pages.", 0), null);
+        await DemoNav.PushAsync(NavigationDemoHelper.MakePage("Home", "Welcome!\nUse the buttons to push and pop pages/modals.", 0), null);
         UpdateStatus();
     }
 
@@ -42,6 +45,27 @@ public partial class NavigationPageDemo : UserControl
         UpdateStatus();
     }
 
+    private async void OnPushModal(object? sender, RoutedEventArgs e)
+    {
+        _modalCount++;
+        var modal = NavigationDemoHelper.MakePage($"Modal {_modalCount}", "This page was presented modally.\nTap 'Pop Modal' to dismiss.", _modalCount);
+        await DemoNav.PushModalAsync(modal);
+        UpdateStatus();
+    }
+
+    private async void OnPopModal(object? sender, RoutedEventArgs e)
+    {
+        await DemoNav.PopModalAsync();
+        UpdateStatus();
+    }
+
+    private async void OnPopAllModals(object? sender, RoutedEventArgs e)
+    {
+        await DemoNav.PopAllModalsAsync();
+        _modalCount = 0;
+        UpdateStatus();
+    }
+
     private void OnHasNavBarChanged(object? sender, RoutedEventArgs e)
     {
         if (DemoNav == null)
@@ -50,7 +74,7 @@ public partial class NavigationPageDemo : UserControl
             NavigationPage.SetHasNavigationBar(DemoNav.CurrentPage, HasNavBarCheck.IsChecked == true);
     }
 
-    private void OnHasBackButonChanged(object? sender, RoutedEventArgs e)
+    private void OnHasBackButtonChanged(object? sender, RoutedEventArgs e)
     {
         if (DemoNav == null)
             return;
@@ -58,9 +82,30 @@ public partial class NavigationPageDemo : UserControl
             NavigationPage.SetHasBackButton(DemoNav.CurrentPage, HasBackButtonCheck.IsChecked == true);
     }
 
+    private void OnHasShadowChanged(object? sender, RoutedEventArgs e)
+    {
+        if (DemoNav == null)
+            return;
+        if (DemoNav.CurrentPage != null)
+            DemoNav.HasShadow = HasShadowCheck.IsChecked == true;
+    }
+
+    private void OnTransitionChanged(object? sender, SelectionChangedEventArgs e)
+    {
+        if (DemoNav == null)
+            return;
+        DemoNav.ModalTransition = TransitionCombo.SelectedIndex switch
+        {
+            1 => new CrossFade(TimeSpan.FromMilliseconds(250)),
+            2 => null,
+            _ => new PageSlide(TimeSpan.FromMilliseconds(300), PageSlide.SlideAxis.Vertical)
+        };
+    }
+
     private void UpdateStatus()
     {
         StatusText.Text = $"Depth: {DemoNav.StackDepth}";
         HeaderText.Text = $"Current: {DemoNav.CurrentPage?.Header ?? "(none)"}";
+        ModalText.Text = $"Modals: {DemoNav.ModalStack.Count}";
     }
 }

src/Semi.Avalonia/Controls/NavigationPage.axaml

@@ -8,6 +8,26 @@
     <ControlTheme x:Key="{x:Type NavigationPage}" TargetType="NavigationPage">
         <Setter Property="Background" Value="Transparent" />
         <Setter Property="BarHeight" Value="{DynamicResource NavigationPageBarMinHeight}" />
+        <Setter Property="PageTransition">
+            <PageSlide Duration="0:0:0.3" Orientation="Horizontal" FillMode="Forward">
+                <PageSlide.SlideInEasing>
+                    <SplineEasing X1="0.16" Y1="1" X2="0.3" Y2="1" />
+                </PageSlide.SlideInEasing>
+                <PageSlide.SlideOutEasing>
+                    <SplineEasing X1="0.2" Y1="0.85" X2="0.3" Y2="1" />
+                </PageSlide.SlideOutEasing>
+            </PageSlide>
+        </Setter>
+        <Setter Property="ModalTransition">
+            <PageSlide Duration="0:0:0.25" Orientation="Vertical" FillMode="Forward">
+                <PageSlide.SlideInEasing>
+                    <SplineEasing X1="0.16" Y1="1" X2="0.3" Y2="1" />
+                </PageSlide.SlideInEasing>
+                <PageSlide.SlideOutEasing>
+                    <SplineEasing X1="0.2" Y1="0.85" X2="0.3" Y2="1" />
+                </PageSlide.SlideOutEasing>
+            </PageSlide>
+        </Setter>
         <Setter Property="Template">
             <ControlTemplate TargetType="NavigationPage">
                 <Panel ClipToBounds="True">
@@ -115,7 +135,7 @@
         <Style Selector="^:nav-bar-compact /template/ ContentPresenter#PART_TopCommandBar CommandBar">
             <Setter Property="DefaultLabelPosition" Value="Collapsed" />
         </Style>
-        
+
         <Style Selector="^.Large">
             <Setter Property="BarHeight" Value="{DynamicResource NavigationPageBarLargeMinHeight}" />
         </Style>