I have constructed the following minimal example, it creates a GtkLayout
with one label inside it, sets the GDK_STRUCTURE_MASK on the GdkWindow
of the GtkLayout and connects the configure-event signal to a routine
that would just exit the main loop. Instead of exiting, the window is
created without the configure-event signal firing. The GdkWindow and its
mask are printed out and appear to be set as per the documentation.
Please can someone explain what is wrong!
#include <gtk/gtk.h>
static gboolean
configure_event ()
{
fprintf (stderr, "configure-event\n");
gtk_main_quit ();
return FALSE;
}
int main(int argc, char *argv[])
{
GtkWidget *window;
GtkWidget *layout;
GtkWidget *label1;
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
layout = gtk_layout_new (NULL, NULL);
gtk_container_add (GTK_CONTAINER (window), layout);
label1 = gtk_label_new ("label 1");
gtk_layout_put (GTK_LAYOUT (layout), label1, 10, 50);
gtk_widget_show_all (window);
GdkWindow *win = gtk_widget_get_window(layout);
g_print("win is %p initial mask 0x%x\n", win, gdk_window_get_events (win));
gdk_window_set_events (win, gdk_window_get_events (win) |
GDK_STRUCTURE_MASK);
g_print("After adding GDK_STRUCTURE_MASK mask 0x%x\n",
gdk_window_get_events (win));
gtk_widget_add_events (layout, GDK_ALL_EVENTS_MASK);
g_signal_connect (layout, "configure-event", G_CALLBACK (configure_event),
NULL);
gtk_main ();
return 0;
}
Richard Shann
> From: Richard Shann <rich...@rshann.plus.com>
> To: gtk-app-devel-list@gnome.org
> Subject: Help replacing GtkDrawingArea with GtkLayout
> Message-ID: <1393771664.4221.117.ca...@debianbox.loc>
> Content-Type: text/plain; charset="UTF-8"
>
> I want to replace the existing GtkDrawingArea with a GtkLayout in a
> large application (GNU Denemo).
> When I do this just by substituting gtk_drawing_area_new() with
> gtk_layout_new(NULL, NULL) I do not receive the configure_event and
> scroll_event signals, although the code gtk_widget_add_events ..
> GDK_EXPOSURE_MASK is still in place.
>
> I suspect this is to do with the cryptic note that drawing has to be
> done to the bin_window instead of window, but beyond that I am stumped.
> The draw event is being handled fine, and mouse button clicks etc are
> all working.
>
> Any help in migrating from GtkDrawingArea to GtkLayout would be much
> appreciated.
>
> Richard Shann
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