GtkScrolledWindow signals

["Tim Barnard" <tbarnard timville org>]

I'm trying to get a GtkScrolledWindow to notify via a scroll_child signal whenever the horizontal scrollbar is moved, but am having no success at all. The scrolled window contains a drawing are widget and the scrolled window itself is within a table widget. Everything works well except for the fact that I never get a scroll_child event. The commented out portion of the code has no effect if uncommented. Here's a simplified code snippit showing how it's all setup (note: the hardcoded numerics [800, 600, 2700, et al.] are there to simplify this snippit):

 

------------------------

GtkWidget * graph_area, * scrollwindow, * table, * window;

GtkWidget * hdr_window, * v_window;

window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

gtk_window_set_default_size(GTK_WINDOW(window), 800, 600);

g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(destroy_event), NULL);

 

graph_area = gtk_drawing_area_new();

scrollwindow = gtk_scrolled_window_new(NULL, NULL);

table = gtk_table_new(3, 3, FALSE);

hdr_window = gtk_fixed_new();

v_window = gtk_drawing_area_new();

 

gtk_widget_set_size_request(hdr_window, 800, 30);

gtk_widget_set_size_request(v_window, 50, 570);

gtk_widget_set_size_request(graph_area, 2700, 570);

 

gtk_container_add(GTK_CONTAINER(window), table);

gtk_table_attach(GTK_TABLE(table), scrollwindow, 0, 1, 1, 2,

        GTK_FILL | GTK_EXPAND, GTK_FILL | GTK_EXPAND, 0, 0);

gtk_table_attach(GTK_TABLE(table), hdr_window, 0, 2, 0, 1,

        GTK_SHRINK, GTK_SHRINK, 0, 0);

gtk_table_attach(GTK_TABLE(table), v_window, 1, 2, 1, 2,

        GTK_SHRINK, GTK_FILL | GTK_EXPAND, 0, 0);

gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(scrollwindow), graph_area);

gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scrollwindow),

        GTK_POLICY_AUTOMATIC,  GTK_POLICY_NEVER);

 

g_signal_connect(G_OBJECT(v_window), "configure_event",

        G_CALLBACK(v_configure_event), NULL);

g_signal_connect(G_OBJECT(v_window), "expose_event",

        G_CALLBACK(v_expose_event), NULL);

g_signal_connect(G_OBJECT(graph_area), "configure_event",

        G_CALLBACK(configure_event), NULL);

g_signal_connect(G_OBJECT(graph_area), "expose_event",

        G_CALLBACK(expose_event), NULL);

 

g_signal_connect(G_OBJECT(scrollwindow), "scroll_child"

        G_CALLBACK(scroll_child), NULL);

 

/*

    I'm not sure when these are needed but I thought I'd give it a try anyway

    to no avail

 

gtk_widget_set_events(scrollwindow, GTK_SCROLL_MASK);

gtk_widget_set_extension_events(scrollwindow, GTK_EXTENSION_EVENTS_ALL);

*/

 

gtk_widget_show(graph_area);

gtk_widget_show(scrollwindow);

gtk_widget_show(hdr_window);

gtk_widget_show(v_window);

gtk_widget_show(table);

gtk_widget_show(window);

------------------------

 

I've searched through the archives and via google but haven't been able to find info on how to setup a scrolled window that uses the scroll_child signal. Any help would be much appreciated.

 

Tim