From c83737161420741c9af40e52533da88d83c697cf Mon Sep 17 00:00:00 2001
From: Piotr Wieczorek <p@wie.cz>
Date: Wed, 24 Jul 2024 18:10:56 +0200
Subject: [PATCH] Add function for getting raw handle of a window under Windows

For #133
---
 window.cxx        |  9 ++++++++-
 window.h          |  3 +++
 window_windows.go | 12 ++++++++++++
 3 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 window_windows.go

diff --git a/window.cxx b/window.cxx
index 3c6b903..67f1298 100644
--- a/window.cxx
+++ b/window.cxx
@@ -2,6 +2,7 @@
 
 #include <FL/Fl_Window.H>
 #include <FL/Fl_Double_Window.H>
+#include <FL/platform.H>
 
 #include "event_handler.h"
 
@@ -71,9 +72,15 @@ void go_fltk_Window_set_icons(Fl_Window* w, const Fl_RGB_Image *images[], int le
 }
 
 void go_fltk_Window_size_range(Fl_Window* w, int minW, int minH, int maxW, int maxH, int deltaX, int deltaY, int aspectRatio) {
-	w->size_range(minW, minH, maxW, maxH, deltaX, deltaY, aspectRatio);
+  w->size_range(minW, minH, maxW, maxH, deltaX, deltaY, aspectRatio);
 }
 
+#ifdef _WIN32
+void* go_fltk_Window_win32_xid(Fl_Window* w) {
+  return fl_win32_xid(w);
+}
+#endif
+
 const int go_FL_CURSOR_DEFAULT = (int)FL_CURSOR_DEFAULT;
 const int go_FL_CURSOR_ARROW = (int)FL_CURSOR_ARROW;
 const int go_FL_CURSOR_CROSS = (int)FL_CURSOR_CROSS;
diff --git a/window.h b/window.h
index 4bed2c0..8a65ca3 100644
--- a/window.h
+++ b/window.h
@@ -24,6 +24,9 @@ extern "C" {
   extern void go_fltk_Window_set_non_modal(Fl_Window *w);
   extern void go_fltk_Window_set_icons(Fl_Window* w, const Fl_RGB_Image* images[], int length);
   extern void go_fltk_Window_size_range(Fl_Window* w, int minW, int minH, int maxW, int maxH, int deltaX, int deltaY, int aspectRatio);
+#ifdef _WIN32
+  extern void* go_fltk_Window_win32_xid(Fl_Window* w);
+#endif
 		
   extern const int go_FL_CURSOR_DEFAULT;
   extern const int go_FL_CURSOR_ARROW;
diff --git a/window_windows.go b/window_windows.go
new file mode 100644
index 0000000..6aa6a67
--- /dev/null
+++ b/window_windows.go
@@ -0,0 +1,12 @@
+//go:build windows
+
+package fltk
+
+/*
+#include "window.h"
+*/
+import "C"
+
+func (w *Window) RawHandle() uintptr {
+	return uintptr(C.go_fltk_Window_win32_xid((*C.Fl_Window)(w.ptr())))
+}