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Incompatible Changes from GTK+-1.2 to GTK+-1.4:
* The gdk_time* functions have been removed. This functionality
has been unused since the main loop was moved into GLib
prior to 1.2.
* The signature for GtkPrintFunc (used for gtk_item_factory_dump_items)
has been changed to take a 'const gchar *' instead of 'gchar *', to
match what we do for glib, and other similar cases.
* The detail arguments in the GtkStyleClass structure are now 'const gchar *'.
* gtk_paned_set_gutter_size() has been removed, since the small handle tab
has been changed to include the entire area previously occupied by
the gutter.
* GDK no longer selects OwnerGrabButtonMask for button presses. This means
that the automatic grab that occurs when the user presses a button
will have owner_events = FALSE, so all events are redirected to the
grab window, even events that would normally go to other windows of the
window's owner.
* GtkColorSelectionDialog has now been moved into it's own set of files,
gtkcolorseldialog.c and gtkcolorseldialog.h.
* Type system changes:
- GTK_TYPE_OBJECT is not a fundamental type anymore. Type checks of the
style (GTK_FUNDAMENTAL_TYPE (some_type) == GTK_TYPE_OBJECT)
will not work anymore. As a replacement, (GTK_TYPE_IS_OBJECT (some_type))
can be used now.
- The following types vanished: GTK_TYPE_ARGS, GTK_TYPE_CALLBACK,
GTK_TYPE_C_CALLBACK, GTK_TYPE_FOREIGN. With them, the corresponding GtkARg
fields and field access macros vanished as well.
- The following type aliases vanished: GTK_TYPE_FLAT_FIRST,
GTK_TYPE_FLAT_LAST, GTK_TYPE_STRUCTURED_FIRST, GTK_TYPE_STRUCTURED_LAST.
- The type macros GTK_TYPE_MAKE() and GTK_TYPE_SEQNO() vanished, use of
GTK_FUNDAMENTAL_TYPE() is discouraged. Instead, the corresponding GType
API should be used: G_TYPE_FUNDAMENTAL(), G_TYPE_DERIVE_ID(),
G_TYPE_BRANCH_SEQNO(). Note that the GLib type system doesn't build new
type ids based on a global incremental sequential number anymore, but
numbers new type ids sequentially per fundamental type branch.
- The following type functions vanished/were replaced:
Old Function Replacement
gtk_type_query() - being investigated -
gtk_type_set_varargs_type() -
gtk_type_get_varargs_type() -
gtk_type_check_object_cast() g_type_check_instance_cast()
gtk_type_check_class_cast() g_type_check_class_cast()
gtk_type_describe_tree() -
gtk_type_describe_heritage() -
gtk_type_free() -
gtk_type_children_types() g_type_children()
gtk_type_set_chunk_alloc() GTypeInfo.n_preallocs
gtk_type_register_enum() g_enum_register_static()
gtk_type_register_flags() g_flags_register_static()
gtk_type_parent_class() g_type_parent() / g_type_class_peek_parent()
Use of g_type_class_ref() / g_type_class_unref() and g_type_class_peek()
is recommended over usage of gtk_type_class().
Use of g_type_register_static() / g_type_register_dynamic() is recommended
over usage of gtk_type_unique().
* Object system changes:
GtkObject derives from GObject, it is not the basic object type anymore.
This imposes the following source incompatible changes:
- GtkObject has no klass field anymore, an object's class can be retrived
with the object's coresponding GTK_<OBJECT>_GET_CLASS (object) macro.
- GtkObjectClass has no type field anymore, a class's type can be retrived
with the GTK_CLASS_TYPE (class) macro.
- GtkObjectClass does not introduce the finalize() or shutdown() method
anymore. While shutdown() is intended for Gtk internal use only, finalize()
is required by a variety of object implementations. GObjectClass.finalize
should be overriden here, e.g.:
static void gtk_label_finalize (GObject *gobject)
{
GtkLabel *label = GTK_LABEL (gobject);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void gtk_label_class_init (GtkLabelClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
gobject_class->finalize = gtk_label_finalize;
}
- the GtkObject::destroy signal can be emitted multiple times on an object
now. ::destroy implementations have to take this into account by
conditionalising freeing/release of assorted resources, e.g.:
if (object->foo_data)
{
g_free (object->foo_data);
object->foo_data = NULL;
}
Also, ::destroy implementations have to release peding object references,
that is, code portions commonly found in finalize implementations like:
if (object->adjustment)
{
gtk_object_unref (object->adjustment);
object->adjustment = NULL;
}
have to be moved into the ::destroy implementations.
This is required to break object reference cycles at destruction time.
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