GTK+ Forums

vronskij · Joined: 27 Feb 2008 Posts: 3

Hi,

I have a small code example, It should demonstrate the event propagation
in GTK+.

I have three widgets. A button, fixed container and a window. I have three
callbacks. After I click on the button, I expect a message from all parent widgets.
I must be missing something, cause it is not working. I am getting message only from the button widget.

Thanks for your suggestions.

jan bodnar

Code: (C)

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#include <gtk/gtk.h>

static gboolean button_reached(GtkWidget *widget, GdkEvent *event, gpointer data)
{
g_print("button widget reached");

return FALSE;
}

static gboolean fixed_reached(GtkWidget *widget, GdkEvent *event, gpointer data)
{
g_print("fixed container reached");

return FALSE;
}

static gboolean window_reached(GtkWidget *widget, gpointer data)
{
g_print("window widget reached");

return FALSE;
}

int main( int argc, char *argv[])
{

GtkWidget *window;
GtkWidget *fixed;
GtkWidget *button;

gtk_init(&argc, &argv);

window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 230, 150);
gtk_window_set_title(GTK_WINDOW(window), "Simple");
gtk_widget_add_events(window, GDK_BUTTON_PRESS_MASK);

fixed = gtk_fixed_new();
gtk_widget_add_events(fixed, GDK_BUTTON_PRESS_MASK);

button = gtk_button_new_with_label("Button");
gtk_fixed_put(GTK_FIXED(fixed), button, 50, 50);
gtk_container_add(GTK_CONTAINER(window), fixed);

g_signal_connect(G_OBJECT(button), "button-press-event",
G_CALLBACK(button_reached), NULL);

g_signal_connect(G_OBJECT(fixed), "button-press-event",
G_CALLBACK(fixed_reached), NULL);

g_signal_connect(G_OBJECT(window), "button-press-event",
G_CALLBACK(window_reached), NULL);

g_signal_connect_swapped(G_OBJECT(window), "destroy",
G_CALLBACK(gtk_main_quit), G_OBJECT(window));

gtk_widget_show_all(window);

gtk_main();

return 0;
}

[/code]