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SWT.VIRTUAL style for tables in Riena [message #1067140]

Sat, 06 July 2013 06:05

Michael Westphal
Messages: 3
Registered: March 2012

Junior Member

Hi,
we are actually using Riena table ridget in a Riena 5 application running with RAP 2.1 of Kepler release. Actually we are using paging for displaying data. But because all data is already in Java containers in memory we want to show all rows without paging. But then the performance is getting bad. Therefore we want to use SWT.VIRTUAL style for the table. Is this possible with Riena ridgets at all or have we to go back to JFace / SWT ?

Best regards
Michael

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Re: SWT.VIRTUAL style for tables in Riena [message #1067349 is a reply to message #1067140]

Mon, 08 July 2013 07:41

Christian Campo
Messages: 590
Registered: July 2009

Senior Member

I checked my workspace and couldnt find a reference to SWT.VIRTUAL. So I think we never tried it.
Next step could be try it out and see for yourself. If that fails, you could still open a bug.
Not sure that we can fix it in a short period of time but I am interested to know what happens if you try.

Or of course you could submit with a patch if you find a solution (long shot since we dont know yet if there is a problem)

christian

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Re: SWT.VIRTUAL style for tables in Riena [message #1101486 is a reply to message #1067349]

Wed, 04 September 2013 10:17

Martin Ferlan
Messages: 1
Registered: June 2013

Junior Member

Problem is not in SWT.VIRTUAL style itself, but when you want to use ILazyContentProvider with virtual table.

Using SWT.VIRTUAL style with ObservableListContentProvider does not achieve anything.
ILazyContentProvider provides the option to fetch the data when the data is needed instead of loading everything into memory

Setting content provider for the current implementation of AbstractTableRidget is placed inside

configureViewer()

method.

It would be nice to provide:
a) additional method in AbstractTableRidget to provide creating custom content provider:

public ObservableListContentProvider createContentProvider(final AbstractTableViewer viewer);

b) implementation of ILazyProvider that extends ObservableListContentProvider
c) implementation of AbstractTableRidget that can easily turn lazy loading on / off

Also, when using virtual table with lazyContentProvider on TableRidgetTableViewer without the actual need for feature in CheckboxTableViewer then sorting is slower (because of extra features in CheckboxTableViewer ).

Best regards,
Martin

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