Thanks very much. But I have Another question:
I want to draw line on my own initiative, don't use "expose-event" and
callback function.
Like the following code, but the code can't do what I want.
Please tell me how to do this?
Code:
+-------------------------------------------------------------------------------------
| int main(int argc, char *argv[])
| {
| GtkWidget *w;
|
| gtk_init(&argc, &argv);
|
| w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
| g_signal_connect(GTK_OBJECT(w), "destroy",
G_CALLBACK(gtk_main_quit), NULL);
|
| gtk_widget_realize(w);
| gdk_draw_line(w->window, w->style->fg_gc[GTK_WIDGET_STATE(w)],
| 0, 0, 120, 120);
|
| gtk_widget_show_all(w);
| gtk_main();
| return 0;
| }
+-------------------------------------------------------------------------------------
On 8/11/08, Emmanuele Bassi <[EMAIL PROTECTED]> wrote:
>
> On Mon, 2008-08-11 at 17:45 +0800, Wu Yin wrote:
> > Code:
> > +----------------------------------------------------------
> > | GtkWidget *w;
> > |
> > | w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
> > +----------------------------------------------------------
> > Why the "w->window" is "NULL"?
>
> the GdkWindow is created after a widget is realized (except for
> NO_WINDOW widgets).
>
> > The GdkDrawable is NULL ,how can I draw things on it?
>
> use the "realize" signal: connect a callback to that signal and you're
> guaranteed that widget->window will be available.
>
> also, read the documentation:
>
> http://library.gnome.org/devel/gtk/stable/GtkWidget.html#gtk-widget-realize
>
> ciao,
> Emmanuele.
>
> --
> Emmanuele Bassi,
> W: http://www.emmanuelebassi.net
> B: http://log.emmanuelebassi.net
>
> _______________________________________________
> gtk-list mailing list
> [email protected]
> http://mail.gnome.org/mailman/listinfo/gtk-list
>
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