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 <ebassi@xxxxxxxxx> 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
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