[news.eclipse.platform.swt] Re: Huge table, records, scrolling, etc.

["Grant Gayed" <grant_gayed@xxxxxxxxxx>]

This is exactly how VIRTUAL works.  For an example snippet see
http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet144.java?rev=HEAD&content-type=text/vnd.viewcvs-markup .
You just retrieve the records lazily when requested in the SetData callback.

Grant

"Mr. Burns" <Mr._Burns@xxxxxx> wrote in message
news:dilfjv$lll$1@xxxxxxxxxxxxxxxxxxx
> Hello,
>
> I have a problem may other developers also have, but I did'nt find any
> resonable solution yet.
> My problem is I want to use SWT to show a table with many records to the
> user.
> Lets say I want to show 1.000.000 records, normally (on less recors) I can
> load all records into table items and then I can show them.
> But 1.000.000 records take a very long time to read from database, so
there
> must be another solution.
> I read something about virtual tables and the propety SWT.SetData. But
with
> this I am not that familiar.
> I suggest do do it like follows:
>
> I only read as many records from database as fit on the screen, lets say
> this are 25. Only if the cursor moves closer to the 25th record the next
25
> records are preloaded and ready to show.
> My 1st problem with this is, how can I make the scrollbar believe there
are
> 1.000.000 records instead of 25? So the slider must be as small as
1.000.000
> records instead of 25 records.
> My 2nd problem is, which trigger / listener I should use to detect/trigger
> the preloading of the next 25 records? I must trigger if the user uses the
> keyboard to move down/up and/or if a user uses the scrollbar.
> I believe there are standard solutions available, but sorry I could not
> find.
>
> Any help would be appreciated, thanks a lot!
>
>