From fdbfd91b8f4994e6dc99009441586cc931666c71 Mon Sep 17 00:00:00 2001
From: Zhang Dian <54255897+zdpcdt@users.noreply.github.com>
Date: Mon, 9 Feb 2026 21:33:12 +0800
Subject: [PATCH] feat: Properly handle nc hit test for caption buttons. (#745)

---
 .../Controls/CaptionButtons.axaml              | 18 +++++++++++++++---
 src/Semi.Avalonia/Controls/TitleBar.axaml      |  6 ++++--
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/src/Semi.Avalonia/Controls/CaptionButtons.axaml b/src/Semi.Avalonia/Controls/CaptionButtons.axaml
index 91afa07..2401879 100644
--- a/src/Semi.Avalonia/Controls/CaptionButtons.axaml
+++ b/src/Semi.Avalonia/Controls/CaptionButtons.axaml
@@ -50,21 +50,33 @@
                             Data="{StaticResource WindowExpandGlyph}"
                             Foreground="{Binding $parent[Button].Foreground}" />
                     </Button>
-                    <Button Name="PART_MinimizeButton" Theme="{StaticResource CaptionButton}">
+                    <Button
+                        Name="PART_MinimizeButton"
+                        Theme="{StaticResource CaptionButton}"
+                        AutomationProperties.Name="Minimize"
+                        Win32Properties.NonClientHitTestResult="MinButton">
                         <PathIcon
                             Name="PART_MinimizeButtonIcon"
                             Theme="{StaticResource InnerPathIcon}"
                             Data="{StaticResource WindowMinimizeGlyph}"
                             Foreground="{Binding $parent[Button].Foreground}" />
                     </Button>
-                    <Button Name="PART_RestoreButton" Theme="{StaticResource CaptionButton}">
+                    <Button
+                        Name="PART_RestoreButton"
+                        Theme="{StaticResource CaptionButton}"
+                        AutomationProperties.Name="Maximize"
+                        Win32Properties.NonClientHitTestResult="MaxButton">
                         <PathIcon
                             Name="PART_RestoreButtonIcon"
                             Theme="{StaticResource InnerPathIcon}"
                             Data="{StaticResource WindowMaximizeGlyph}"
                             Foreground="{Binding $parent[Button].Foreground}" />
                     </Button>
-                    <Button Name="PART_CloseButton" Theme="{StaticResource CaptionButton}">
+                    <Button
+                        Name="PART_CloseButton"
+                        Theme="{StaticResource CaptionButton}"
+                        AutomationProperties.Name="Close"
+                        Win32Properties.NonClientHitTestResult="Close">
                         <PathIcon
                             Name="PART_CloseButtonIcon"
                             Theme="{StaticResource InnerPathIcon}"
diff --git a/src/Semi.Avalonia/Controls/TitleBar.axaml b/src/Semi.Avalonia/Controls/TitleBar.axaml
index 7b8619b..2755724 100644
--- a/src/Semi.Avalonia/Controls/TitleBar.axaml
+++ b/src/Semi.Avalonia/Controls/TitleBar.axaml
@@ -16,12 +16,14 @@
                         <Border
                             Name="PART_Background"
                             Background="{TemplateBinding Background}"
-                            IsHitTestVisible="False" />
+                            IsHitTestVisible="False"
+                            Win32Properties.NonClientHitTestResult="Caption" />
                         <CaptionButtons
                             Name="PART_CaptionButtons"
                             HorizontalAlignment="Right"
                             VerticalAlignment="Top"
-                            Foreground="{TemplateBinding Foreground}" />
+                            Foreground="{TemplateBinding Foreground}"
+                            Win32Properties.NonClientHitTestResult="Client" />
                     </Panel>
                 </Panel>
             </ControlTemplate>