From 239253ecb125a4587eacc89b435bcc031afe08db Mon Sep 17 00:00:00 2001
From: Noisyfox <timemanager.rick@gmail.com>
Date: Mon, 30 Mar 2026 19:18:56 +0800
Subject: [PATCH] Fix title bar resize grabber on Windows (#13020)

Make sure the title control passes all mouse events to its parent
---
 src/slic3r/GUI/BBLTopbar.cpp | 12 ++++++++++++
 src/slic3r/GUI/BBLTopbar.hpp |  5 +++++
 2 files changed, 17 insertions(+)

diff --git a/src/slic3r/GUI/BBLTopbar.cpp b/src/slic3r/GUI/BBLTopbar.cpp
index 38daf204fb..05c861c1be 100644
--- a/src/slic3r/GUI/BBLTopbar.cpp
+++ b/src/slic3r/GUI/BBLTopbar.cpp
@@ -749,6 +749,18 @@ wxAuiToolBarItem* BBLTopbar::FindToolByCurrentPosition()
 }
 
 #ifdef __WIN32__
+WXLRESULT CenteredTitle::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
+{
+    switch (nMsg) {
+    case WM_NCHITTEST: {
+        // Pass all mouse event to parent
+        return HTTRANSPARENT;
+    }
+    }
+
+    return wxControl::MSWWindowProc(nMsg, wParam, lParam);
+}
+
 WXLRESULT BBLTopbar::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 {
     switch (nMsg) {
diff --git a/src/slic3r/GUI/BBLTopbar.hpp b/src/slic3r/GUI/BBLTopbar.hpp
index 8fc77e774e..1de36ce736 100644
--- a/src/slic3r/GUI/BBLTopbar.hpp
+++ b/src/slic3r/GUI/BBLTopbar.hpp
@@ -18,6 +18,11 @@ public:
 
     wxSize DoGetBestSize() const override;
 
+protected:
+#ifdef __WIN32__
+    WXLRESULT MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam) override;
+#endif
+
 private:
     wxString m_title;
 };