Undo will not work after Preview

rbuser

In RB 10.04 end-user report design:

- I make a change.
- I check that Edit > Undo item exists (e.g. Undo:4).
- I Preview my change and switch back to the Design tab.
- The Undo item no longer exists.

As a result, I cannot use Preview to test my changes before committing
to them.
--

nardmoseley

It is working as designed. Prior to Preview, the report layout is saved to
an internal memory stream and then restored upon return from Preview. (Upon
Preview, the RAP code can run during report generation and in doing so can
modify the report layout.)

--
Nard Moseley
Digital Metaphors
www.digital-metaphors.com

rbuser

Nard Moseley (Digital Metaphors) wrote:



Why not save and restore the history at the same time then? The preview
is mainly used to see if things were correct. Not being able to use the
history feature after a preview makes it a lot less useful.

Jan Derk

rbuser

Jan Derk wrote:




Come to think of it some more: When doing a preview would it be a good
idea to copy the design time report structure and use that for the
preview?

Then RAP would never interfere with the Designer, you would not have to
save and load the report to a memory stream and the history would keep
working.

Jan Derk

nardmoseley

Thanks for the feedback.

The original scope and design, did not include persisting the Undo History.
Perhaps we can add that feature to a future release.

Copying the report structure is probably not a viable option. A report can
reference other objects, particulary data access components that reside on
the same form/datamodule and thus have the same Owner. Thus a copy of
report, will need the same Owner as the original report, opps - now name
collisions with the original report will occur.

--
Nard Moseley
Digital Metaphors
www.digital-metaphors.com