On Tue, Dec 01, 2009 at 09:59:07AM +0100, Till Harbaum wrote:
> i am changing the UI of an existing app for mobile usage in a way that i
> replace
> some gtkentry's with some gtkbuttons which the use some alternate input
> method.
>
> I want to keep as much of the application as it is and one of the things the
> app expects
> is that this particular widget emits a "changed" event whenever its contents
> changes.
>
> So i'd like to enable my gtkbutton to emit a "changed" event, but i don't
> find any examples
> on how to achieve that. How do i "attach" a new signal to an existing widget
> type?
If you agree that what you are trying to do is silly and you are
desperate, you are allowed to read on.
I'm not sure what it means `contents changed' for a button. So I
respond to "clicked". But you can emit the signal in response to
"notify::label" (i.e. the change of the label) or whatever it means
`contents changed' for you.
Yeti
----------------------------------------------------------
#include <gtk/gtk.h>
static void
emit(GObject *object, gpointer user_data)
{
guint id = GPOINTER_TO_UINT(user_data);
g_signal_emit(object, id, 0);
}
static void
changed(GObject *object)
{
g_print("signal \"changed\" emitted on instance %p (%s)\n",
object, G_OBJECT_TYPE_NAME(object));
}
int
main(int argc, char *argv[])
{
GtkWidget *window, *button;
guint id;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
id = g_signal_new("changed", GTK_TYPE_BUTTON,
G_SIGNAL_RUN_FIRST, 0, NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
button = gtk_button_new_with_label("Click Me!");
g_signal_connect(button, "clicked", G_CALLBACK(emit), GUINT_TO_POINTER(id));
g_signal_connect(button, "changed", G_CALLBACK(changed), NULL);
gtk_container_add(GTK_CONTAINER(window), button);
gtk_widget_show_all(window);
gtk_main();
return 0;
}
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