From 3bfc63a85508e3d6b6b5879a980c1798225a6d89 Mon Sep 17 00:00:00 2001
From: Javier Sancho <jsf@jsancho.org>
Date: Mon, 27 Apr 2020 08:44:22 +0200
Subject: [PATCH] Scrollbars are GUI elements too

---
 src/gui-scrollbar.cpp | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/gui-scrollbar.cpp b/src/gui-scrollbar.cpp
index 9a71d78..c5dbc8a 100644
--- a/src/gui-scrollbar.cpp
+++ b/src/gui-scrollbar.cpp
@@ -22,6 +22,7 @@
 #include <irrlicht/irrlicht.h>
 #include <libguile.h>
 
+#include "gui-element.h"
 #include "gui-scrollbar.h"
 #include "gsubr.h"
 #include "wrapped.h"
@@ -43,7 +44,14 @@ extern "C" {
   SCM
   irr_gui_getPos (SCM wrapped_scrollbar)
   {
-    irr::gui::IGUIScrollBar* scrollbar = unwrap_gui_scrollbar (wrapped_scrollbar);
+    irr::gui::IGUIScrollBar* scrollbar;
+    if (gui_element_p (wrapped_scrollbar))
+      {
+        scrollbar = (irr::gui::IGUIScrollBar*)unwrap_gui_element (wrapped_scrollbar);
+      }
+    else {
+      scrollbar = unwrap_gui_scrollbar (wrapped_scrollbar);
+    }
     return scm_from_int32 (scrollbar->getPos ());
   }
 
@@ -51,7 +59,14 @@ extern "C" {
   irr_gui_setPos (SCM wrapped_scrollbar,
                   SCM pos)
   {
-    irr::gui::IGUIScrollBar* scrollbar = unwrap_gui_scrollbar (wrapped_scrollbar);
+    irr::gui::IGUIScrollBar* scrollbar;
+    if (gui_element_p (wrapped_scrollbar))
+      {
+        scrollbar = (irr::gui::IGUIScrollBar*)unwrap_gui_element (wrapped_scrollbar);
+      }
+    else {
+      scrollbar = unwrap_gui_scrollbar (wrapped_scrollbar);
+    }
     scrollbar->setPos (scm_to_int32 (pos));
     return SCM_UNSPECIFIED;
   }
-- 
2.39.5