Re: [ROOT] How to display a large table in a TGFrame?

From: cstrato (cstrato@aon.at)
Date: Thu Feb 13 2003 - 23:54:35 MET


Dear Brett

Thank you for this useful information.
I was afraid, that someone (you) would say this.
However, I will try your suggestions.

Best regards
Christian


Brett Viren wrote:

> cstrato writes:
>  >  > I would like to display a table and scroll through a
>  > table in a TGFrame in a spreadsheet-like form. The size
>  > of the table should be e.g. 100,000 rows and 500 columns.
>  >  > Is it possible to implement this?
>  > Is it possible to use TGTableLayout for this purpose?
> 
> As far as I know, there are no explicit limits on the table size a
> TGTableLayout can handle.  Looking back over the code seems to confirm
> this.  Although, it does need to know its table size at construction
> time which may not be desirable.
> 
> I would worry more about the layout speed with that many cells.  This
> code was largely stolen from Gtk+'s table widget which is intended
> more to layout GUIs of relatively few cells.  Also of note, GtkTable
> was not chosen to layout the spreadsheat in Gnumeric, instead a custom
> widget was used.  This may or may not be telling of some deficiency.
> 
> I'd suggest just writting a little test code that adds a frame with a
> TGTableLayout into a TGCanvas.  The TGCanvas provides the scrolling.
> Then fill the table with a bunch of other frames, maybe just buttons
> or labels and see how it works.
> 
> If TGTableLayout is indeed too slow, you might try writing a simpler
> version which doesn't support cells spanning more than one row/column.
> Also, TGTableLayout optimizes the spacing, whereas spreadsheat table
> row/column sizes are usually forced by the user.  Maybe TGMatrixLayout
> would be worth looking at?
> 
> -Brett.
> 
> 
> 
> 



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