Button label centering with GTK+2

[Julian Smart]

What happened when you tried my code in samples/minimal? Just to 
eliminate differences in how the font is being set.

It does sound like a problem with the way GTK+ (or the theme) renders 
its buttons.

Regards,

Julian

raananb wrote:
> Some further experimentation (see http://erbarzel.club.fr/Fonts.jpg)
>
> Three buttons in FreeSans font:
> "Get pictures" is in size 8
> "Folder" 10
> "Sort by date" 12
>
> Two buttons in Sans font:
> "Select All" 10
> "Rename" 12
>
> None is in bold.
>
> My conclusion is that (1) the fonts have a preset margin which shows up when
> the button is not tall enough to accomodate the font and it margins: the
> upper margin is rendered and the rest is drawn in whatever is left and (2)
> the rendering engine does not try to center the text by reducing these
> margins when the button cannot accomodate the font and its margins.
>
> The first thing is a given, probably resulting from ages of font design
> which incorporates spacing in each letter block. This could probably be done
> away with today, when spacing could be left to the computer to compute, but
> is not likely to happen any time soon.
>
> The second could be improved, by disregarding the margins when they
> interfere. 
>
> I guess that in the meantime, size selection is the only way to solve the
> issue.
>
>
>
>
>
>
>
>
> Julian Smart wrote:
>   
>> If I add this to the end of the frame constructor in the minimal sample 
>> in wxWidgets 2.8 (today's SVN):
>>
>>     wxFont font(*wxNORMAL_FONT);
>>     font.SetWeight(wxBOLD);
>>
>>     wxPanel* panel = new wxPanel(this, wxID_ANY);
>>     wxButton* button = new wxButton(panel, wxID_OK, wxT("Hello"), 
>> wxPoint(10, 10), wxSize(200, -1));
>>     button->SetFont(font);
>>
>> I get a bold button correctly centred in both orientations (Debian Etch, 
>> Gnome).
>>
>> Perhaps you could try the above, and if you still get the off-centre 
>> label then that could indicate a difference either in GTK+ or in version 
>> of wxGTK, or maybe related to the version of desktop environment or theme.
>>
>> I'd suggest simply not using bold. It may make the user think it's the 
>> default button.
>>
>> Regards,
>>
>> Julian
>>
>> raananb wrote:
>>     
>>> Packages are identified as 
>>> Thanks.
>>> Installed packages:
>>>
>>> gtk2-engines 1:2.14.1-0ubuntu1
>>> gtk2-engines-murrine  0.53.1-1ubuntu1
>>> gtk2-engines-pixbuf 2.12.9-3ubuntu4
>>>
>>> apt-get update + apt-get upgrade did not provide a newer library.
>>>
>>> Does this provide any useful information?
>>>
>>> Where do I go from here?
>>>
>>>
>>> Igor Korot wrote:
>>>   
>>>       
>>>> What GTK version do you use? Is upgrading GTK help?
>>>>
>>>> Maybe it's a GTK bug/limitation...
>>>>
>>>> Thank you.
>>>>
>>>> -----Original Message-----
>>>>     
>>>>         
>>>>> From: Vadim Zeitlin <vadim at wxwidgets.org>
>>>>> Sent: May 21, 2008 5:49 AM
>>>>> To: wx-users at lists.wxwidgets.org
>>>>> Subject: Re[2]: Button label centering with GTK+2
>>>>>
>>>>> On Tue, 20 May 2008 14:25:41 -0700 (PDT) raananb <raanan at barzel.org>
>>>>>       
>>>>>           
>>> wrote:
>>>   
>>>       
>>>>> r> Tried different sequences, but no improvement. I did notice that the
>>>>>       
>>>>>           
>>> problem
>>>   
>>>       
>>>>> r> is present with the larger font even if it is normal (not bold).
>>>>>
>>>>> Sorry, you've already tried everything I could think of. I really don't
>>>>> know why doesn't gtk_button_set_alignment() work and have no other
>>>>> ideas
>>>>> about how to fix it unfortunately.
>>>>>
>>>>> Regards,
>>>>> VZ
>>>>>
>>>>> -- 
>>>>> TT-Solutions: wxWidgets consultancy and technical support
>>>>>               http://www.tt-solutions.com/
>>>>>
>>>>> _______________________________________________
>>>>> wx-users mailing list
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>>>>> http://lists.wxwidgets.org/mailman/listinfo/wx-users
>>>>>       
>>>>>           
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>>>>
>>>>     
>>>>         
>>>   
>>>       
>> -- 
>> Julian Smart, Anthemion Software Ltd.
>> 28/5 Gillespie Crescent, Edinburgh, Midlothian, EH10 4HU
>> www.anthemion.co.uk | +44 (0)131 229 5306
>> Tools for writers: www.writerscafe.co.uk
>> wxWidgets RAD:     www.anthemion.co.uk/dialogblocks
>>
>> _______________________________________________
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>> http://lists.wxwidgets.org/mailman/listinfo/wx-users
>>
>>
>>     
>
>   


-- 
Julian Smart, Anthemion Software Ltd.
28/5 Gillespie Crescent, Edinburgh, Midlothian, EH10 4HU
www.anthemion.co.uk | +44 (0)131 229 5306
Tools for writers: www.writerscafe.co.uk
wxWidgets RAD:     www.anthemion.co.uk/dialogblocks