diff -r 22f6dadd9f46 -r 38cb8e3992e8 ui/gtk/toolkit.h
--- a/ui/gtk/toolkit.h	Thu Oct 03 15:37:55 2024 +0200
+++ b/ui/gtk/toolkit.h	Thu Oct 03 18:54:19 2024 +0200
@@ -112,6 +112,22 @@
     void        *customdata;
 } UiEventData;
 
+typedef struct UiEventDataExt {
+    UiObject    *obj;
+    ui_callback callback;
+    void        *userdata;
+    ui_callback callback2;
+    void        *userdata2;
+    int         value0;
+    int         value1;
+    int         value2;
+    int         value3;
+    void        *customdata0;
+    void        *customdata1;
+    void        *customdata2;
+    void        *customdata3;
+} UiEventDataExt;
+
 typedef struct UiVarEventData {
     UiObject    *obj;
     UiVar       *var;