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Grid/GridTreeViewer performance [message #53920]

Tue, 27 May 2008 21:36

Lei

Messages: 23
Registered: July 2009

Junior Member

hi everyone,

i am working on a project where we use the Grid as a tree and i've come
across a performance bottleneck in the grid. i see the whenever the
setText,setBg, setFg, etc... methods are called on the GridItem, it would
triggered a redraw and therefore a onPaint method on the Grid class. and
because the onPaint method is very expensive, it slows down the gui thread
when there are a lot of updates/sec on the grid. is this intended? any
work around?

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Re: Grid/GridTreeViewer performance [message #53937 is a reply to message #53920]

Tue, 27 May 2008 21:56

Thomas Schindl

Messages: 6651
Registered: July 2009

Senior Member

Does it help to call setRedraw(false) before doing the update and
setRedraw(true) afterwards?

Tom

Lei schrieb:
> hi everyone,
>
> i am working on a project where we use the Grid as a tree and i've come
> across a performance bottleneck in the grid. i see the whenever the
> setText,setBg, setFg, etc... methods are called on the GridItem, it
> would triggered a redraw and therefore a onPaint method on the Grid
> class. and because the onPaint method is very expensive, it slows down
> the gui thread when there are a lot of updates/sec on the grid. is this
> intended? any work around?

--
B e s t S o l u t i o n . at
------------------------------------------------------------ --------
Tom Schindl JFace-Committer
------------------------------------------------------------ --------

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Re: Grid/GridTreeViewer performance [message #54002 is a reply to message #53937]

Wed, 28 May 2008 13:45

Lei

Messages: 23
Registered: July 2009

Junior Member

so, it is true that grid repaints the entire table on every cell update?
can it do row-level update without repainting the entire table or is there
a way to customize the table to do that? the cost of repainting is so
expensive, it can easily slows down the application. thx.

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