+ long ret = item,
+ max = GetItemCount();
+ wxCHECK_MSG( (ret == -1) || (ret < max), -1,
+ _T("invalid listctrl index in GetNextItem()") );
+
+ // notice that we start with the next item (or the first one if item == -1)
+ // and this is intentional to allow writing a simple loop to iterate over
+ // all selected items
+ ret++;
+ if ( ret == max )
+ {
+ // this is not an error because the index was ok initially, just no
+ // such item
+ return -1;
+ }
+