Merge pull request #9221 from AvaloniaUI/fixes/8869-show-windowstate

Fix setting WindowState before showing Window.

samples/IntegrationTestApp/MainWindow.axaml

@@ -109,6 +109,12 @@
             <ComboBoxItem>CenterScreen</ComboBoxItem>
             <ComboBoxItem>CenterOwner</ComboBoxItem>
           </ComboBox>
+          <ComboBox Name="ShowWindowState" SelectedIndex="0">
+            <ComboBoxItem>Normal</ComboBoxItem>
+            <ComboBoxItem>Minimized</ComboBoxItem>
+            <ComboBoxItem>Maximized</ComboBoxItem>
+            <ComboBoxItem>FullScreen</ComboBoxItem>
+          </ComboBox>
           <Button Name="ShowWindow">Show Window</Button>
           <Button Name="SendToBack">Send to Back</Button>
           <Button Name="ExitFullscreen">Exit Fullscreen</Button>

samples/IntegrationTestApp/MainWindow.axaml.cs

@@ -53,6 +53,7 @@ namespace IntegrationTestApp
             var sizeTextBox = this.GetControl<TextBox>("ShowWindowSize");
             var modeComboBox = this.GetControl<ComboBox>("ShowWindowMode");
             var locationComboBox = this.GetControl<ComboBox>("ShowWindowLocation");
+            var stateComboBox = this.GetControl<ComboBox>("ShowWindowState");
             var size = !string.IsNullOrWhiteSpace(sizeTextBox.Text) ? Size.Parse(sizeTextBox.Text) : (Size?)null;
             var owner = (Window)this.GetVisualRoot()!;
 
@@ -68,6 +69,7 @@ namespace IntegrationTestApp
             }
 
             sizeTextBox.Text = string.Empty;
+            window.WindowState = (WindowState)stateComboBox.SelectedIndex;
 
             switch (modeComboBox.SelectedIndex)
             {

samples/IntegrationTestApp/ShowWindowTest.axaml

@@ -29,7 +29,7 @@
       <ComboBoxItem>Normal</ComboBoxItem>
       <ComboBoxItem>Minimized</ComboBoxItem>
       <ComboBoxItem>Maximized</ComboBoxItem>
-      <ComboBoxItem>Fullscreen</ComboBoxItem>
+      <ComboBoxItem>FullScreen</ComboBoxItem>
     </ComboBox>
     <Button Name="HideButton" Grid.Row="8" Command="{Binding $parent[Window].Hide}">Hide</Button>
   </Grid>

src/Windows/Avalonia.Win32/WindowImpl.AppWndProc.cs

@@ -399,9 +399,13 @@ namespace Avalonia.Win32
                             Resized(clientSize / RenderScaling, _resizeReason);
                         }
 
-                        var windowState = size == SizeCommand.Maximized ?
-                            WindowState.Maximized :
-                            (size == SizeCommand.Minimized ? WindowState.Minimized : WindowState.Normal);
+                        var windowState = size switch
+                        {
+                            SizeCommand.Maximized => WindowState.Maximized,
+                            SizeCommand.Minimized => WindowState.Minimized,
+                            _ when _isFullScreenActive => WindowState.FullScreen,
+                            _ => WindowState.Normal,
+                        };
 
                         if (windowState != _lastWindowState)
                         {

src/Windows/Avalonia.Win32/WindowImpl.cs

@@ -245,6 +245,11 @@ namespace Avalonia.Win32
         {
             get
             {
+                if (!IsWindowVisible(_hwnd))
+                {
+                    return _showWindowState;
+                }
+
                 if (_isFullScreenActive)
                 {
                     return WindowState.FullScreen;
@@ -511,6 +516,9 @@ namespace Avalonia.Win32
 
         public void Resize(Size value, PlatformResizeReason reason)
         {
+            if (WindowState != WindowState.Normal)
+                return;
+
             int requestedClientWidth = (int)(value.Width * RenderScaling);
             int requestedClientHeight = (int)(value.Height * RenderScaling);
 
@@ -856,11 +864,10 @@ namespace Avalonia.Win32
 
                 var window_rect = monitor_info.rcMonitor.ToPixelRect();
 
+                _isFullScreenActive = true;
                 SetWindowPos(_hwnd, IntPtr.Zero, window_rect.X, window_rect.Y,
                              window_rect.Width, window_rect.Height,
                              SetWindowPosFlags.SWP_NOZORDER | SetWindowPosFlags.SWP_NOACTIVATE | SetWindowPosFlags.SWP_FRAMECHANGED);
-
-                _isFullScreenActive = true;
             }
             else
             {