Re: Pixmap (II)

[Richard Boaz <riboaz xs4all nl>]

Hi,

1) gtk_pixmap_new() is old and should not be used; I think you want  
to be using gtk_image_new_from_pixmap() instead.
2) though that said, if the image is going to be changing during the  
course of the program, you might want to do it differently (depending):
	2.1) create the image widget at app startup with gtk_image_new()
	2.2) then, in your drawing routine, once you've got your pixmap, set  
the image widget with gtk_image_set_from_pixmap()
3) and I believe, in the case of using an image widget, you do not  
need to manage configure and expose events yourself, they are  
internally managed, so this part of my explanation is not relevant/ 
valid; you can execute your drawing routine (to get the pixmap and  
then place it in the image) and be done.

(I do not use the Gtk image myself, so if any of the above is wrong,  
would someone else please correct me?)

Rather, the paradigm I laid out below I use for DrawingArea widgets  
and displaying pixmaps therein; drawing area widgets require the user  
manage the configure() and expose() events themselves.

richard

On Aug 9, 2006, at 10:13 AM, Roses Roses wrote:

> 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
>
> _________________________________________________________________
> Horóscopo, tarot, numerología... Escucha lo que te dicen los astros.
> http://astrocentro.msn.es/
>
> _______________________________________________
> gtk-list mailing list
> gtk-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-list