Re: gtk3: Replaced PsppSheetView with GtkTreeView for the variables window

[John Darrington]

On Thu, Dec 10, 2015 at 10:41:23AM -0800, Ben Pfaff wrote:
     On Thu, Dec 10, 2015 at 07:12:36PM +0100, John Darrington wrote:
     > I don't exactly recall the reasons why we decided that GtkTreeView didn't
     > satisfy our needs - perhaps it was to do with the rendering of the 
"special"
     > widgets in the Variable type,decimals and value labels columns - but 
maybe
     > whatever it was, they no longer apply now that we have moved to Gtk+3
     
     The only real issue with GtkTreeView is that it doesn't efficiently
     handle large data sets.  It uses O(n) time to deal with a sheet with n
     rows or n columns.  It's fine for small data sets but with a million
     rows it falls over.
     

Oh I think I remember now.  As I recall it, there is no problem with large 
numbers of rows,
so long as the "fixed-row-height" property is set.  The problem comes with 
large numbers
of columns (unfortunately there is no corresponding "fixed-column-width" 
property).  This
is why Ben invented the PsppireColumnFacade thing.

However, this won't be a problem for the variable sheet, since that only has a 
small number
of columns.  But it could be a problem in the data sheet when large numbers of 
variables 
are involved.

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