Re: Questions about NSMatrix and NSTableView

[Fred Kiefer]

Hi Benoit,

Benoit Astruc wrote:
>     In my app I use some NSTableView, on Mac OS X, without coding 
> anything the user can move from one cell to the other simply by pressing 
> the down or up key. But on GNUstep it doesn't work :-(. So my question : 
> will NSTableView in GNUstep one day have this enable by default and if 
> not how can i do enable it ?

Could you please describe in more detail what you would expect pressing 
the up, down (probably also left, right) key to trigger? Normally an 
NSTableView is working with rows or columns, cells come only into play 
when you select or edit one. Are you now talking about the cell 
selection, which should be moved or about the row/column selection?


>     I have another issue with NSMatrix, I use some NSMatrix in my app 
> with code like that :
> ------------------------------
>     /*
>      *    On affiche les informations du système sélectionné
>      */
>     if([defaults boolForKey: @"displayRevenus"])
>     {
>         /*
>          *    Revenus
>          */
>         [matriceStatus addRow];
>         if ([theSysteme revolte])
>         {
>             [matriceStatus putCell:
>                 [[[NSCell alloc] initImageCell: ledRouge] autorelease]
>                                              atRow: i
>                                             column: 0];
>         }
>         else
>         {
>             [matriceStatus putCell:
>                 [[[NSCell alloc] initImageCell: ledVerte] autorelease]
>                                              atRow: i
>                                             column: 0];
>         }
>         [matriceDivers addRow];
>         tx = ([theSysteme revenus100]*100)/[rapport revenus100Total];
>         [matriceDivers putCell:
>             [[[NSCell alloc] initTextCell:
>                 [NSString stringWithFormat: @"%i %%",tx]] autorelease]
>                                          atRow: i
>                                         column: 0];
>         [matriceSysteme addRow];
>         [matriceSysteme putCell:
>             [[[NSCell alloc] initTextCell: @"Revenus :"] autorelease]
>                                             atRow: i
>                                          column: 0];
>         [matriceSysteme putCell:
>             [[[NSCell alloc] initTextCell: [theSysteme revenus2]] 
> autorelease]
>                                             atRow: i
>                                          column: 1];
>        
>         i++;
>     }
> ----------------------
>
>     This code create the cells for one row, and in the same manner I 
> create cells for others rows if the user prefs ask for them. You can see 
> the result on Mac OS X here : 
> http://benoit.astruc.free.fr/weymery/WRP/WRPsys0.4.7.png
>
>     But on GNUstep all the NSCell are created but all on the bottom of 
> the NSMatrix and only the first created appears ??? What can I do ?

I wrote a short demo applciation to test the described behaviour and 
yes,the output on GNUstep does not show the new cells. The I looked up 
the definition of addRow in the specification:

"This method doesn t redraw the receiver. Accordingly, after calling 
this method you should send setNeedsDisplay (page 472) to the receiver. 
Your code may also need to use sizeToCells (page 855) after sending this 
method to resize the receiver to fit the newly added cells."

When adding these two methods after a call to addRow, my demo 
application behaves as expected. It may well be that Cocoa no longer 
follows its own specification an the calls are no longer necessary 
there, but I think that GNUstep should stick with the old behaviour 
until the specification changes. What you need to do is add two lines 
after each call to addRow.

[matrix sizeToFit];
[matrix setNeedsDisplay: YES];

This should do the trick on GNUstep and hopefully doesn't cause any harm 
on Cocoa, but who knows.

Cheers
Fred