diff -r 29d98cff4f56 -r 853685152c1d ui/common/types.c
--- a/ui/common/types.c	Sat Nov 11 12:22:16 2017 +0100
+++ b/ui/common/types.c	Sun Nov 12 12:03:50 2017 +0100
@@ -223,6 +223,15 @@
     return i;
 }
 
+UiDouble* ui_double_new(UiContext *ctx, char *name) {
+    UiDouble *d = ui_malloc(ctx, sizeof(UiDouble));
+    memset(d, 0, sizeof(UiDouble));
+    if(name) {
+        uic_reg_var(ctx, name, UI_VAR_DOUBLE, d);
+    }
+    return d;
+}
+
 UiString* ui_string_new(UiContext *ctx, char *name) {
     UiString *s = ui_malloc(ctx, sizeof(UiString));
     memset(s, 0, sizeof(UiString));
@@ -241,6 +250,15 @@
     return t;
 }
 
+UiRange* ui_range_new(UiContext *ctx, char *name) {
+    UiRange *r = ui_malloc(ctx, sizeof(UiRange));
+    memset(r, 0, sizeof(UiRange));
+    if(name) {
+        uic_reg_var(ctx, name, UI_VAR_RANGE, r);
+    }
+    return r;
+}
+
 
 // private functions
 void uic_int_copy(UiInteger *from, UiInteger *to) {
@@ -249,6 +267,12 @@
     to->obj = from->obj;
 }
 
+void uic_double_copy(UiDouble *from, UiDouble *to) {
+    to->get = from->get;
+    to->set = from->set;
+    to->obj = from->obj;
+}
+
 void uic_string_copy(UiString *from, UiString *to) {
     to->get = from->get;
     to->set = from->set;
@@ -289,6 +313,11 @@
     i->value = i->get(i);
 }
 
+void uic_double_save(UiDouble *d) {
+    if(!d->obj) return;
+    d->value = d->get(d);
+}
+
 void uic_string_save(UiString *s) {
     if(!s->obj) return;
     s->get(s);
@@ -312,6 +341,12 @@
     i->obj = NULL;
 }
 
+void uic_double_unbind(UiDouble *d) {
+    d->get = NULL;
+    d->set = NULL;
+    d->obj = NULL;
+}
+
 void uic_string_unbind(UiString *s) {
     s->get = NULL;
     s->set = NULL;