[REBOL] list style
From: robert:muench:robertmuench at: 9-Apr-2002 20:32
Hi, I have the following problem: I'm using a list style to display some data.
For the list style you supply a layout block that gets called once the block
containing the list style gets layouted:
mygui: layout [ lst: list 200x200 lstlayout supply lstsupply]
Than for each row in the list that can be displayed lstsupply is called for all
columns.
In my situation I need to execute a block of code once before the list get's
updated and once the list updated ended. The pattern should be like this:
- lstlayout once when calling layout
- lstconstructor once the list drawing starts
- lstsupply gets called (row * columns) times
- lstdestructor once the list drawing ended
Something like this:
mygui: layout [ lst: list 200x200 lstlayout start lstconstructor supply
lstsupply end lstdestructor]
Is this possible? Robert
