Pixmap (II)

["Roses Roses" <salgari2004 hotmail com>]

Hi!

I've read your solution, but I haven't obtained the correct answer.

My drawable routine is the next:

 GdkBitmap *masc; // Mascara de bits
 GtkStyle *stile; // Estilo
 stile = gtk_widget_get_style(window);
pixmap=gdk_pixmap_create_from_xpm(window->window,&masc,&stile->bg[GTK_STATE_NORMAL],"gtk.xpm"); 
//pixmap is a GdkPixmap and gtk.xpm is the new path of the new image
 pixmapwid= gtk_pixmap_new (pixmap, masc); //pixmapwid is a GtkWidget
 gtk_widget_queue_draw_area(pixmapwid,0,0,900,400);
 gtk_widget_show(pixmapwid);

But seems it's not correct. Have I any erro?

Thanks!!

============================================

hi,

one possible paradigm is to adhere to the following guidelines:

1) the configure event callback is responsible for calling all  routines 
responsible for "drawing" the pixmap for ultimate display,  but does NOT do 
the actual display to the screen;

2) the expose event callback is responsible for rendering the current  
pixmap to be displayed to the screen, but does NO "drawing" here,  only 
render the pixmap to the screen via gdk_draw_drawable() or  equivalent;

3.1) the drawing routine(s) are responsible for creating the pixmap  for 
ultimate display;

3.2) store the address of the pixmap in a variable that the expose  event 
callback also has access to (global or otherwise)

3.3) the last command as part of the drawing routine is to call  
gtk_widget_queue_draw_area() on the widget used to display
the pixmap; this will force an expose event

in this manner, your drawing routine is called on all configure  events 
followed immediately by the expose event rendering the pixmap  to the 
screen.  while calling your drawing routine via a user-event,  or some other 
event internal to the program, will also result in the  expose event being 
called to render the newly made pixmap to the screen.

so, in your case, you would attach the button-click to a callback  
ultimately calling your pixmap drawing routine.  the drawing routine  will 
then be called on button-click and your new pixmap will be  rendered via the 
expose event.

cheers,

richard

On Aug 2, 2006, at 11:43 AM, Roses Roses wrote:

	 	Hi!!!

I'm programming a little interface but I have a  prblem. The  objective of
this program is shows a pixmap qhich must ghange qhen the user  clicks on  a
button. How the fuction of the button can change the pixmap assigned?

One idea I've is declare  the GtkPixmap as a global variable, but  I'm not
sure if this plan can run.

Thank you very much

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