I'm still trying to create a simple Undo mechanism for a succession of
fields acting as cells in a grid-like structure, a bit like a
spreadsheet. I am not using table fields. It is easy to implement Cut,
Copy, Paste and Clear functions for these fields, to be operated by
conventional menu items,and it's possible to store the previous
contents of a field before a cut, paste or clear modifies it. However
in my Undo, I not only want to restore the contents of the last
modified field, but I also want to put the insertion point back where
it was before the action took place. I thought that by storing the
clickCharChunk in a global variable, I would be able to restore its
position by something like
do("click at the loc of" && gRememberedInsertionPoint)
The problem with this approach is that the clickCharChunk seems very
often to be empty. In the docs, it says that the clickCharChunk is
only empty if the last click wasn't on a field, but I do my
remembering from within a 'selectionChanged' handler within the field
itself, so I can guarantee that the last click was in a field. I also
tried it with an 'openField' message, but that doesn't seem to set the
clickCharChunk either.
Clearly I have misunderstood something. Can anyone suggest an approach
that will work?
TIA
Graham
PS if anyone is wondering about my previous problems with the
focusedObject in this same project, it turned out to be a problem with
the debugger I'm using thru GLX2. No doubt it will be fixed soon.
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