From bfb3dd671bb98925d80e8567c10fd6918faeaaae Mon Sep 17 00:00:00 2001
From: Zhang Dian <54255897+zdpcdt@users.noreply.github.com>
Date: Sat, 21 Mar 2026 22:21:23 +0800
Subject: [PATCH] Add fullscreen toggle functionality and update popover
 alignment (#773)

* fix: update Height binding and add VerticalAlignment to fullscreen popover.

* feat: add fullscreen toggle functionality with F11 key.
---
 .../Views/MainWindow.axaml.cs                 | 27 +++++++++++++++++++
 .../Controls/WindowDrawnDecorations.axaml     |  3 ++-
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/demo/Semi.Avalonia.Demo/Views/MainWindow.axaml.cs b/demo/Semi.Avalonia.Demo/Views/MainWindow.axaml.cs
index 505265d..6e98169 100644
--- a/demo/Semi.Avalonia.Demo/Views/MainWindow.axaml.cs
+++ b/demo/Semi.Avalonia.Demo/Views/MainWindow.axaml.cs
@@ -1,11 +1,38 @@
 using Avalonia.Controls;
+using Avalonia.Input;
 
 namespace Semi.Avalonia.Demo.Views;
 
 public partial class MainWindow : Window
 {
+    private WindowState _stateBeforeFullScreen = WindowState.Normal;
+
     public MainWindow()
     {
         InitializeComponent();
+        KeyDown += FullScreenKeyDown;
+    }
+
+    private void FullScreenKeyDown(object? sender, KeyEventArgs e)
+    {
+        if (e.Key == Key.F11)
+        {
+            
+            ToggleFullScreen();
+            e.Handled = true;
+        }
+    }
+
+    private void ToggleFullScreen()
+    {
+        if (WindowState is not WindowState.FullScreen)
+        {
+            _stateBeforeFullScreen = WindowState;
+            WindowState = WindowState.FullScreen;
+        }
+        else
+        {
+            WindowState = _stateBeforeFullScreen;
+        }
     }
 }
\ No newline at end of file
diff --git a/src/Semi.Avalonia/Controls/WindowDrawnDecorations.axaml b/src/Semi.Avalonia/Controls/WindowDrawnDecorations.axaml
index 820fec8..fd7153c 100644
--- a/src/Semi.Avalonia/Controls/WindowDrawnDecorations.axaml
+++ b/src/Semi.Avalonia/Controls/WindowDrawnDecorations.axaml
@@ -120,8 +120,9 @@
                     <WindowDrawnDecorationsContent.FullscreenPopover>
                         <!--  Shown on hover at top edge in fullscreen  -->
                         <DockPanel
-                            Height="{TemplateBinding TitleBarHeight}"
+                            Height="{TemplateBinding DefaultTitleBarHeight}"
                             Background="{DynamicResource TitleBarBackground}"
+                            VerticalAlignment="Top"
                             WindowDecorationProperties.ElementRole="TitleBar">
                             <StackPanel DockPanel.Dock="Right" Orientation="Horizontal">
                                 <Button