NSTabView resize issue

[Andreas Hoeschler]

Hello all,

I have discovered an incompatibility between Cocoa and GNUstep 
regarding the resize of an NSTabView. My application works on both 
Cocoa and GNUstep, but on GNUstep the UI elements are aligned at the 
bottom of the NSTabViewItem (its view) and on Cocoa at the top (which 
is what I prefer). I tried to figure out what happens behind the 
scenes. When I resize the tabView on Cocoa I get

2004-08-20 12:17:54.097 SmartClient[2411] <GSTabView: 0x23ddc70> 
setFrame {{212.897, 10}, {273.103, 540}}
2004-08-20 12:17:54.098 SmartClient[2411] <GSGrid: 0x1c10e0> setFrame 
{{10, 33}, {253, 94}}
2004-08-20 12:17:54.098 SmartClient[2411] <GSGrid: 0x1c10e0> setFrame 
{{10, 33}, {253.103, 494}}
2004-08-20 12:17:54.098 SmartClient[2411] <GSTabView: 0x23ddc70> 
setFrame {{212.897, 10}, {273.103, 540}}

GSTabView is a NSTabView subclass. GSGrid is a sublclass of NSView and 
set as the view of the tabViewItem. I am not sure where the second line 
comes from but you can see that the height of the GSGrid (NSTabViewItem 
view) is close to the height of the tabView which is what I would 
expect.

On GNUstep I get the following:

2004-08-20 12:36:33.000 SmartClient[11685] <GSTabView: 363078> setFrame 
{x=217.5; y=10; width=254.5; height=683}
2004-08-20 12:36:33.000 SmartClient[11685] <GSGrid: 39cec0> setFrame 
{x=0.5; y=1; width=253.5; height=102}
2004-08-20 12:36:36.000 SmartClient[11685] <GSTabView: 363078> setFrame 
{x=218; y=10; width=255; height=683}
2004-08-20 12:36:36.000 SmartClient[11685] <GSGrid: 39cec0> setFrame 
{x=0.5; y=1; width=254; height=99}

That's something I don't understand. The height of the subview 
(NSTabViewItem view) does not follow the height of the NSTabView. It 
remains constant at about 100 pixel. I am still not sure whether this 
behaviour is caused by my sublcasses or by the NSTabView implementation 
of GNUstep, but since the same code behaves differently on both systems 
I guess its probably the NSTabView implementation. Can anybody with 
insights on NSTabView comment this? Is there any reason why the innards 
of the NSTableView should not follow the NSTabView frame?

Thanks a lot!

Regards,

  Andreas