In VLF-ONE code you can directly access the Visual LANSA list (class #PRIM_LIST) that is used to visualize the instance list content.
Filter and command handler code can access the list control in instance list handlers, using method avListManager.avVisualList. This returns a reference to the PRIM_LIST object, if it is available.
Once you have a reference to the list, you can access its items and columns, using the standard VL collection properties.
Direct access is only available if:
- the instance list handler implements the list as a PRIM_LIST
- the instance list handler makes the list available. (The standard instance list handlers VF_UM040O and VF_UM044O do)
This allows filters to make minor changes to the appearance of the instance list.
For example if the instance list normally looks like this:
You could modify it from the filter so that it looks like this:
Using code in the filter's uInitialize routine that looks like this:
