diff -r dbde25a5bc53 -r c03c338a7dcf ui/common/context.h
--- a/ui/common/context.h	Tue Jan 24 18:46:47 2017 +0100
+++ b/ui/common/context.h	Fri Nov 10 17:17:14 2017 +0100
@@ -1,7 +1,7 @@
 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
- * Copyright 2014 Olaf Wintermann. All rights reserved.
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -43,17 +43,29 @@
 typedef struct UiListVar     UiListVar;
 typedef struct UiGroupWidget UiGroupWidget;
 
+typedef enum UiVarType UiVarType;
+
+enum UiVarType {
+    UI_VAR_SPECIAL = 0,
+    UI_VAR_INTEGER,
+    UI_VAR_STRING,
+    UI_VAR_TEXT,
+    UI_VAR_LIST,
+    UI_VAR_RANGE
+};
+
 struct UiContext {
     UiContext     *parent;
     UiObject      *obj;
     UcxMempool    *mempool;
+    UcxMap        *bound; // key: char*  value: UiVar*
     UcxMap        *vars; // key: char*  value: UiVar*
     void          *document;
     UcxList       *groups; // int list
     UcxList       *group_widgets; // UiGroupWidget* list
     
     void (*set_document)(UiContext *ctx, void *document);
-    void (*detach_document)(UiContext *ctx, void *document);
+    void (*detach_document)(UiContext *ctx);
     
     char          *title;
     
@@ -66,18 +78,10 @@
 };
 
 struct UiVar {
-    void   *value;
-    int    type;
-    int    isextern;
-    UcxMap *from;
-};
-
-struct UiListPtr {
-    UiList *list;
-};
-
-struct UiListVar {
-    UiListPtr *listptr;
+    void      *value;
+    void      *orig_val;
+    UiVarType type;
+    UiVar     *from;
 };
 
 struct UiGroupWidget {
@@ -86,30 +90,22 @@
     int      numgroups;
 };
 
-enum UiVarType {
-    UI_VAR_INTEGER = 0,
-    UI_VAR_STRING,
-    UI_VAR_TEXT,
-    UI_VAR_LIST
-};
 
 UiContext* uic_context(UiObject *toplevel, UcxMempool *mp);
 UiContext* uic_root_context(UiContext *ctx);
 void uic_context_set_document(UiContext *ctx, void *document);
-void uic_context_detach_document(UiContext *ctx, void *document);
+void uic_context_detach_document(UiContext *ctx);
+
+//UiVar* uic_get_var(UiContext *ctx, char *name);
+UiVar* uic_create_var(UiContext *ctx, char *name, UiVarType type);
+void* uic_create_value(UiContext *ctx, UiVarType type);
 
-UiVar* uic_get_var(UiContext *ctx, char *name);
-UiVar* uic_connect_var(UiContext *ctx, char *name, int type);
-void uic_move_var(UiVar *from, UiVar *to, UiBool set);
-void uic_reg_var(UiContext *ctx, char *name, int type, size_t vs, void *value);
-void uic_add_var(
-        UiContext *ctx,
-        char *name,
-        UiVar *newvar,
-        int type,
-        size_t vs);
+void uic_copy_binding(UiVar *from, UiVar *to, UiBool copytodoc);
+void uic_unbind_var(UiVar *var);
 
-void* uic_create_value(UcxAllocator *a, int type);
+void uic_reg_var(UiContext *ctx, char *name, UiVarType type, void *value);
+
+void uic_remove_bound_var(UiContext *ctx, UiVar *var);
 
 void uic_check_group_widgets(UiContext *ctx);
 void uic_add_group_widget(UiContext *ctx, void *widget, UcxList *groups);