RE : RE : drawing and erasing text

["POULAIN DOMINIQUE (AREVA TA)" <dominique poulain1 areva com>]

Hello Tor,

I know that the gdk_font family functions and gdk_draw_string are deprecated, I use them because it was  
easier for me when I translate my XWindows plotting part on my sotfware to Gdk (in order to port the entire 
software from Linux to Windows). Using Pango layout and gtk_draw_layout leads to same problem : the text is 
not drawn in Xor mode (we can see also that the colour is not the same for the lines and text).

The Xor mode is a smart and easy way to erase some drawing (more than saving and restoring the original plot 
under each text notes, each axe's tics... we must calculate the involved region, and what to do when a note 
to erase is near a another one we want to keep). I will be sorry if I dont find a solution ! 

The CbExpose callback was called repeated over and over by the use in the sample program of 
gtk_widget_modify_bg. I replace it by  gdk_window_set_background that doesn't change the background ! and at 
last I use gtk_draw_rectangle to paint the entire drawing area in the background colour I want.    

In the XWindows, I use a XChangeWindowAttributes to set the backing store which prevents to have to redraw 
the plot when another window comes over a part of the drawing. With the backing store, no expose event is 
send in these cases. Is there a way to obtain the same beahivior with Gdk ?  If not, I will use a pixmap to 
save and restore quickly the plot rather than redrawing billion of points on each expose event.

The use of setlocale is for trying to have the buttons from stock in French. In fact, the problem is when I 
distribute my software on Windows, Gtk seems to not find the .../share/locale/fr/LC_MESSAGES/gtk20.mo and the 
button are in English. Is there a path to set ?

The last problem is about the tree view with multiple selection. On Windows, when I use Ctrl or Shift keys 
and left click to select multiple items, it works fine until I select three or four items : suddenly the tree 
is collapsed. It seems to be the same with demo program of GTK.   

Thank you for your answer.
     

-----Message d'origine-----
De : tlillqvist gmail com [mailto:tlillqvist gmail com] De la part de Tor Lillqvist
Envoyé : lundi 23 février 2009 15:59
À : POULAIN DOMINIQUE (AREVA TA)
Cc : gtk-app-devel-list gnome org
Objet : Re: RE : drawing and erasing text

Hmm, do you know that the gdk_font_* and gdk_draw_string() APIs are
deprecated and de facto unmaintained? Whether some aspect of it works
fully or not on Windows is hardly interesting at this point.

When I run your program both in Linux and Windows, the CbExpose
callback is called repeatedly over and over. Does that happen for you,
too? I wonder why that happens.

By the way, the XLFD you pass to gdk_font_load_for_display,
"-adobe-helvetica-medium-r-normal--10-100-75-75-p-56-iso8859-1" is way
too specific and probably works only on the distro and combination of
package versions you happen to be using. No matching font was found on
openSUSE 11.1, for instance. (Instead, I just used
"-*-fixed-medium-r-normal--*-100-*-*-c-*-iso8859-1")  (But as I said,
using the XLFD-based font API is deprecated anyway.)

You call  setlocale(LC_ALL, "fr"). Note that the setlocale() function
in the Microsoft C library used on Windows in general does not accept
locale names in the form commonly used on Unixes, using ISO639
language codes and ISO3166 country codes. But just out of luck, for
"fr" it happens to work apparently, but not in general for locale
codes like "fr_CA", "sv" or "de" for instance.

--tml