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SWT table, scrolling [message #455661]

Thu, 19 May 2005 13:44

mr. burns

Messages: 402
Registered: July 2009

Senior Member

Hello,

I have a table filled with 100 records from a mySQL database. Now I want if
one scrolls down and nearly comes to the 100th record automatically 100 more
records will be read from the database and be displayed in the table.
I do not know which event I have to choose to check if one is close to the
100th record on scrolling.

Any idea?

Thanks!

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Re: SWT table, scrolling [message #455681 is a reply to message #455661]

Thu, 19 May 2005 15:46

Steve Northover

Messages: 1636
Registered: July 2009

Senior Member

The way many applications do this is to either use a virtual table (see
SWT.VIRTUAL), fill the table from a background thread or implement a paging
strategy, like a web browser. Trying to do this by tracking the scroll bar
will fail for a bunch of reasons. For example, the native table can move
the scroll bar without issuing notificaiton.

"Mr. Burns" <Mr._Burns@web.de> wrote in message
news:d6i58g$sg3$1@news.eclipse.org...
> Hello,
>
> I have a table filled with 100 records from a mySQL database. Now I want
if
> one scrolls down and nearly comes to the 100th record automatically 100
more
> records will be read from the database and be displayed in the table.
> I do not know which event I have to choose to check if one is close to the
> 100th record on scrolling.
>
> Any idea?
>
> Thanks!
>
>

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Re: SWT table, scrolling [message #455842 is a reply to message #455681]

Fri, 20 May 2005 07:34

Yves Harms

Messages: 80
Registered: July 2009

Member

The virtual implementation of tableviewer requests newly displayed rows
row for row (-> one db call for ech row). But you could cache the data
in your contentprovider and fetch 100 rows if a cache miss occurs.

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Re: SWT table, scrolling [message #455845 is a reply to message #455842]

Fri, 20 May 2005 09:21

mr. burns

Messages: 402
Registered: July 2009

Senior Member

Hello Yves,

Thanks for your reply, but I am new to SWT and tables.
Is it possible, that you can explain it for a beginner also?
Or give a code snippet?

Thanks again!

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