[crossfire] libglade...

[Kevin R. Bulgrien]

Ok, a branch gtk-v2-libglade has been created.  I'm making progress on
the conversion now.  It's mostly a bunch of rock breaking.

> (crossfire-client-gtk2:1780): Gtk-CRITICAL **: gtk_widget_set_size_request: assertion `GTK_IS_WIDGET (widget)' failed
> 
> ** (crossfire-client-gtk2:1780): WARNING **: Widget not found: map_notebook
> 
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 47046947261936 (LWP 1780)]
> 0x00000000004180dd in map_init (window_root=0x9920c0) at map.c:100
> 100         mapgc = gdk_gc_new(map_drawing_area->window);
> (gdb) bt
> #0  0x00000000004180dd in map_init (window_root=0x9920c0) at map.c:100
> #1  0x0000000000417eae in main (argc=1, argv=0x7fffb7d82098) at main.c:695
> 
> I only changed code in main.c for the window_root, so perhaps it has
> something to do with needing other things initializing from the .glade
> file too.

The other windows are converted to load from the xml file now, but the
segfault was caused because lookup_widget() calls were returning null
pointers.  lookup_widget() is not working with libglade.

The problem is addressed in a libglade FAQ...

| 4.5 How do I get a pointer to a widget from within a signal handler?
| 
| If you have a pointer to any widget in a window, you can get a pointer to
| any other widget in the window using the lookup_widget() function that Glade
| provides (in support.c).
| 
| You pass it a pointer to any widget in a window, and the name of the widget
| that you want to get. Usually in signal handlers you can use the first argument
| to the signal handler as the first parameter to lookup_widget(), e.g.
| 
| void
| on_button1_clicked (GtkButton *button, gpointer user_data)
| {
|   GtkWidget *entry1;
| 
|   entry1 = lookup_widget (GTK_WIDGET (button), "entry1");
|   ...
| }
| 
| Note that this does not work if you are using libglade. The corresponding
| code for libglade would be:
| 
| void on_button1_clicked (GtkButton *button, gpointer user_data)
| {
|   GladeXML* xml;
|   GtkWidget* entry1;
| 
|  xml = glade_get_widget_tree (GTK_WIDGET (button1));
|   entry1 = glade_xml_get_widget (xml, "entry1");
|   ...
| }

And there are a lot of lookup_widget() calls to replace in that client code.
But, after only doing a couple of files, it is obvious that the problem is
fixing.  The windows render more completely with each lookup_widget
that is converted.

Kevin R. Bulgrien