Merge pull request #291 from yangjieshao/main

窗口全屏切换 从退出全屏时肯定变为Normal改成变为进入全屏前的状态(即 也可能进入Maximized状态)

src/Ursa/Controls/ImageViewer/ImageViewer.cs

@@ -265,6 +265,7 @@ public class ImageViewer: TemplatedControl
             if (scale < _sourceMinScale) scale = _sourceMinScale;
             Scale = scale;
         }
+        e.Handled = true;
     }
 
     protected override void OnPointerMoved(PointerEventArgs e)

src/Ursa/Controls/TitleBar/CaptionButtons.cs

@@ -1,4 +1,4 @@
-using Avalonia;
+using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Controls.Metadata;
 using Avalonia.Controls.Primitives;
@@ -25,7 +25,11 @@ public class CaptionButtons: Avalonia.Controls.Chrome.CaptionButtons
     private Button? _fullScreenButton;
     
     private IDisposable? _visibilityDisposable;
-    
+
+    /// <summary>
+    /// 切换进入全屏前 窗口的状态
+    /// </summary>
+    private WindowState? _oldWindowState;
     protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
     {
         _closeButton = e.NameScope.Get<Button>(PART_CloseButton);
@@ -36,6 +40,8 @@ public class CaptionButtons: Avalonia.Controls.Chrome.CaptionButtons
         Button.ClickEvent.AddHandler((o, args) => OnRestore(), _restoreButton);
         Button.ClickEvent.AddHandler((o, args) => OnMinimize(), _minimizeButton);
         Button.ClickEvent.AddHandler((o, args) => OnToggleFullScreen(), _fullScreenButton);
+
+        Window.WindowStateProperty.Changed.AddClassHandler<Window, WindowState>(WindowStateChanged);
         if (this.HostWindow is not null && !HostWindow.CanResize)
         {
             _restoreButton.IsEnabled = false;
@@ -43,6 +49,29 @@ public class CaptionButtons: Avalonia.Controls.Chrome.CaptionButtons
         UpdateVisibility();
     }
 
+    private void WindowStateChanged(Window window, AvaloniaPropertyChangedEventArgs<WindowState> e)
+    {
+        if (window != HostWindow) return;
+        if (e.NewValue.Value == WindowState.FullScreen)
+        {
+            _oldWindowState = e.OldValue.Value;
+        }
+    }
+
+    protected override void OnToggleFullScreen()
+    {
+        if (HostWindow != null)
+        {
+            if (HostWindow.WindowState != WindowState.FullScreen)
+            {
+                HostWindow.WindowState = WindowState.FullScreen;
+            }
+            else
+            {
+                HostWindow.WindowState = _oldWindowState.HasValue ? _oldWindowState.Value : WindowState.Normal;
+            }
+        }
+    }
     public override void Attach(Window hostWindow)
     {
         base.Attach(hostWindow);