Scroll in table

[marco]

Hi everybody
anyone knows how to capture a scroll event in a table ???

I need to populate a table with a lot of rows, but it is so slowly, so i
tought to load only 50 rows at time.
I show only 25 rows and i'd like that when i scroll for 10 rows the table, i
clear table and populate again with new 50 rows and move right row like
first of table.
Any suggest ??
is it possible ???

Thank's
Marco

[LuisG]

Unfortunately, events are not currently sent when a table is scrolled.

However, CVI includes a scrollbar custom control that you can use to display a fake scrollbar next to the table (you would then hide the table's own scrollbar). You can then respond to the events that this scrollbar sends, and update your table as needed.

There is an example program, samples\userint\custctrl\scrollbar\scrollsample.prj that you can look at to see if it meets your needs.

Luis
NI

[marco]

Hi LuisG
I just tied this solution succefully, but i used a numeric control. but now
i'm trying scrollbar control.
Thank's a lot for your suggest

Marco

[Wim S]

Hello Marco,

You say populating your table is going very slowly. I suppose you are using the function SetTableCellVal in some kind of loop. This causes the table to be redrawn every time this function is executed.  Try using SetTableCellAttribute with ATTR_CTRL_VAL. This avoids the redrawing and is much faster. You can insert a ProcessDrawEvents() after all table cells are assigned a value.

[marco]

Good suggestion...
i'm tried this immediatly.
Thank's Wim S

"Wim S" <x@no.email> ha scritto nel messaggio
news:1145565619169-354762@exchange.ni.com...
> Hello Marco,
> &nbsp;
> You say populating your table is going very slowly. I suppose you are
> using the function SetTableCellVal in some kind of loop. This causes the
> table to be redrawn every time this function is executed.&nbsp; Try using
> SetTableCellAttribute with ATTR_CTRL_VAL. This avoids the redrawing and is
> much faster. You can insert a ProcessDrawEvents() after all table cells
> are assigned a value.

[marco]

It's right 😉
in this way i can scroll table with around 3000 records in same time of old
version and 500 records.
Thank you