Re: TreeView

[Leandro Fanzone <leandro hasar com>]

Along with Caryl, I will give my opinion about it, having used both 
CList and TreeView over a number of years. Probably both are the two 
possible extremes of what one really needs. CList was far too 
simplistic, but quick enough to throw a list of something "right now" in 
a dialog. TreeView, on the other hand, is far too complex, baroque as 
nothing is in gtk(mm), though excellently wrapped in C++, it is still 
very dificult to understand (especially if you have to customize it a 
liitle), and I found myself ending up copying/pasting code from past 
projects to make it work, and writing more generic code to achieve the 
usual things: numeric/string columns with validations, with all the 
usual stuff to add them.
I think, for the first comer, it's appallingly overwhelming to learn 
enough to be a scholar especialized in TreeView just to show a small 
list of data, which is something quite usual for any application out 
there. If we add to that the serious performance problems TreeView has 
with large amounts of rows, well, it seems to be reasonable to have 
CList back, if only to have an option, both for the newbie, for the 
quick-and-dirty stuff, and for the "I need the simplest and faster one 
to show a zillion of rows". My two (argentinean peso) cents here.

Leandro.

J. Baltasar Garcia Perez-Schofield wrote:
> 	Hi, there !
>
> 	I have a TreeView used in order to show some information. However, I
> would like the user to have the opportunity to show some columns and
> hide others. The TreeModel needs therefore to be dynamic. So I was
> creating the famous column layout:
>
> class DocumentColumns : public Gtk::TreeModel::ColumnRecord {
> public:
> 	Gtk::TreeModelColumn<string> data;
>
> 	DocumentColumns()
> 		{}
> 			
> 	createColumns();
> };
>
> 	However, I need to specify the actual number of
> Gtk::TreeModelColumn<>'s I need, and I simply don't know they number at
> compile time. Would it be possible to create a vector of
> Gtk::TreeModelColumn<>'s, and adding that dynamically-created columns ?
> Will the TreeView change when the model changes (afer calling
> createColumns() and set_model()) ? Or do I have to recreate the TreeView
> from the beginning ?
>
> 	Actually (this is constructive criticism), I have to confess that I am
> very disappointed with TreeView and the absence or CList (or something
> like that). I would like to add string columns and rows for simple uses
> such as this one in a simple way, and not with the overhead that
> TreeView implies, which is good for advanced uses but excessively
> complex for the easiest ones.
>
> 	I wonder why CList was not re-implemented for Gtkmm2 as a wrapper for
> TreeView. Or maybe there is another component doing this which I don't
> know about.
>
> 	Salud !
>
> 		Baltasar
>
>
>
> --
>
> PBC -- J. Baltasar García Perez-Schofield
> jbgarcia en uvigo de es  http://webs.uvigo.es/jbgarcia/
> Dep. Informática, Universidad de Vigo, España (Spain)
>
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