enhance: supports Windows 11 Snap Layout when hovering the maximize button (#1957) (#1958)

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Native/Windows.cs

@@ -71,14 +71,9 @@ public void SetupWindow(Window window)
 
             Win32Properties.AddWndProcHookCallback(window, (IntPtr hWnd, uint msg, IntPtr _, IntPtr lParam, ref bool handled) =>
             {
-                // Custom WM_NCHITTEST
-                if (msg == 0x0084)
+                // Custom WM_NCHITTEST only used to limit the resize border to 4 * window.RenderScaling pixels.
+                if (msg == 0x0084 && window.WindowState == WindowState.Normal)
                 {
-                    handled = true;
-
-                    if (window.WindowState == WindowState.FullScreen || window.WindowState == WindowState.Maximized)
-                        return 1; // HTCLIENT
-
                     var p = IntPtrToPixelPoint(lParam);
                     GetWindowRect(hWnd, out var rcWindow);
 
@@ -95,18 +90,23 @@ public void SetupWindow(Window window)
                     else if (p.Y < rcWindow.bottom && p.Y >= rcWindow.bottom - borderThickness)
                         y = 2;
 
+                    // If it's in the client area, do not handle it here.
                     var zone = y * 3 + x;
+                    if (zone == 4)
+                        return IntPtr.Zero;
+
+                    // If it's in the resize border area, return the proper HT code.
+                    handled = true;
                     return zone switch
                     {
                         0 => 13, // HTTOPLEFT
                         1 => 12, // HTTOP
                         2 => 14, // HTTOPRIGHT
                         3 => 10, // HTLEFT
-                        4 => 1, // HTCLIENT
                         5 => 11, // HTRIGHT
                         6 => 16, // HTBOTTOMLEFT
                         7 => 15, // HTBOTTOM
-                        _ => 17,
+                        _ => 17, // HTBOTTOMRIGHT
                     };
                 }
 

src/Views/CaptionButtons.axaml

@@ -6,13 +6,13 @@
              x:Class="SourceGit.Views.CaptionButtons"
              x:Name="ThisControl">
   <StackPanel Orientation="Horizontal">
-    <Button Classes="caption_button" Click="MinimizeWindow" IsVisible="{Binding !#ThisControl.IsCloseButtonOnly}">
+    <Button Classes="caption_button" Click="MinimizeWindow" Win32Properties.NonClientHitTestResult="MinButton" IsVisible="{Binding !#ThisControl.IsCloseButtonOnly}">
       <Path Width="11" Height="11" Margin="0,2,0,0" Data="{StaticResource Icons.Window.Minimize}"/>
     </Button>
-    <Button Classes="caption_button max_or_restore_btn" Click="MaximizeOrRestoreWindow" IsVisible="{Binding !#ThisControl.IsCloseButtonOnly}">
+    <Button Classes="caption_button max_or_restore_btn" Win32Properties.NonClientHitTestResult="MaxButton" Click="MaximizeOrRestoreWindow" IsVisible="{Binding !#ThisControl.IsCloseButtonOnly}">
       <Path Width="10" Height="10" Margin="0,4,0,0"/>
     </Button>
-    <Button Classes="caption_button" Click="CloseWindow">
+    <Button Classes="caption_button" Win32Properties.NonClientHitTestResult="Close" Click="CloseWindow">
       <Path Width="9" Height="9" Margin="0,4,2,0" Data="{StaticResource Icons.Window.Close}"/>
     </Button>
   </StackPanel>