From fc2755524f765293bc1ecffc2e857dfaf0857dd9 Mon Sep 17 00:00:00 2001
From: Steve Cornett <21205494+stevecor@users.noreply.github.com>
Date: Fri, 26 Jun 2026 15:48:38 -0700
Subject: [PATCH] Add system colour change handler to wxSashWindow

Closes #26638.
---
 include/wx/generic/sashwin.h | 1 +
 src/generic/sashwin.cpp      | 8 +++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/wx/generic/sashwin.h b/include/wx/generic/sashwin.h
index 846f1122eb..0c90471b6f 100644
--- a/include/wx/generic/sashwin.h
+++ b/include/wx/generic/sashwin.h
@@ -157,6 +157,7 @@ public:
 
 private:
     void Init();
+    void OnSysColourChanged(wxSysColourChangedEvent& event);
 
     wxSashEdge  m_sashes[4];
     int         m_dragMode;
diff --git a/src/generic/sashwin.cpp b/src/generic/sashwin.cpp
index b1440bb0fb..af5ee7cddc 100644
--- a/src/generic/sashwin.cpp
+++ b/src/generic/sashwin.cpp
@@ -38,6 +38,7 @@ wxIMPLEMENT_DYNAMIC_CLASS(wxSashEvent, wxCommandEvent);
 wxBEGIN_EVENT_TABLE(wxSashWindow, wxWindow)
     EVT_PAINT(wxSashWindow::OnPaint)
     EVT_SIZE(wxSashWindow::OnSize)
+    EVT_SYS_COLOUR_CHANGED(wxSashWindow::OnSysColourChanged)
     EVT_MOUSE_EVENTS(wxSashWindow::OnMouseEvent)
 #if defined( __WXMSW__ ) || defined( __WXMAC__)
     EVT_SET_CURSOR(wxSashWindow::OnSetCursor)
@@ -76,7 +77,6 @@ void wxSashWindow::Init()
     m_mouseCaptured = false;
     m_currentCursor = nullptr;
 
-    // Eventually, we'll respond to colour change messages
     InitColours();
 }
 
@@ -359,6 +359,12 @@ void wxSashWindow::OnSize(wxSizeEvent& WXUNUSED(event))
     SizeWindows();
 }
 
+void wxSashWindow::OnSysColourChanged(wxSysColourChangedEvent& event)
+{
+    InitColours();
+    event.Skip();
+}
+
 wxSashEdgePosition wxSashWindow::SashHitTest(int x, int y, int WXUNUSED(tolerance))
 {
     int cx, cy;