How to delete row in listbox with formatting

Hello, I have a listbox and I want to delete selected rows (by clicking button in the example). It deletes the rows just fine but the problem is that I also want to preserve formating of the items when they are moved. The only way is to copy the formating programatically which is incredibly s l o w. Even if I defer panel updates it takes second to delete 20rows and reformat the rest. Do u have anybody any idea how to do that in more usable way? Thanks!!!
Message Edited by ceties on 07-17-2009 06:44 AM
LV 2011, Win7
Attachments:
DeleteRowsPreserveFormatting.vi ‏38 KB

Hi Ceties,
You are right that deffering front panel in
this case doesn't help so much. This is because Multiconumn Listbox
doesn't use Synchronous Display by default. If you set to use
synchronous display, and you wouldn't deffer front panel updates, your
performance would be significantly wors.
With attached
example, to erase one row, when I set different formatting for each
cell, it takes about 0.6s on my computer to finish. With Synchronous
Display it takes more than 6s !, so you could see great difference.
Moreover,as you can see, I read all the time actual formatting. this
reading takes about 0.20s itself. If you avoid reading it all the time,
and instead you will keep it in memory, you can save somethink like 30%
of the time!
In case you need to update each
cell font separately, you need to update a lot of cells. In our case
it is about 2000 property node calls. Positive think is, that more
cells you delete, faster theoperation is
Anyway, I
belive that it is not very important to keep all the data in the table.
If the performance is of the question, I would keep all data in memory
in shift registers for example, and I would all the time display just
reasonable amount of data in listbox. You can implement scrolling by
your self, and thus you could keep just couple of hundred rows
displayed.However, this would give another challange to update all the
time formatting as you scroll
At
the last, I believe that with good architecture it should not be
problem to update those data in table from different locations. It can
just take some more time to develop your code
Use just useful advices
Martin
Attachments:
Copy of DeleteRowsPreserveFormatting-3.vi ‏63 KB

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