I think I should be able to do this without asking for help, but sometimes
the old brain just gets stuck.
I'm using a virtual tree to display and edit some data.
Each node has some data associated with it, and I use a record and a pointer
to that record to get the data.
If you are used to using Virtual Trees, you will know what I mean.
I've subclassed the form, overridden then GetNodeDataSize method, but since
the Tree.GetNodeData method always refers to a pointer to a record, I'm a
little bit stumped on how to add some extra fields to that record.
e.g.
TOriginalNodeData = record
id : integer;
value : double;
end;
pOriginalNodeData = ^TOriginalNodeData;
Then with my subclass, the node data looks like this:
TNewNodeData = record
id : integer;
value : double;
valueInherited : boolean;
end;
But this means that I have to re-declare all of the old fields in my new
record, and if the original record changes, things are going to go BANG.
I can declare
TNewNodeData = record
OldStuff : TOriginalNodeData;
valueInherited : boolean;
end;
and this works, but means I have to dereference OldStuff all of the time.
I'm sure that variant records should allow me to do what I want, but I'm
really stuck on how to declare it.
Any ideas?
Trevor
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