BonoboPersistStream
Interface for anything that can save / load itself from a Bonobo stream.
The PersistStream interface is the interface to use for all new
components that are able to load and save themselves to a stream.
It should be associated with any #BonoboEmbeddable for use by the
container in creating a compound document.
This interface works by connecting callbacks to the methods, in
a somewhat deprecated fashion, it is probably better nowadays to
simply sub-class the BonoboXObject and override the epv methods.
Either way, after all the caveats here is an example use:
Implementing the PersistStream callbacks
static void
load_from_stream (BonoboPersistStream *ps,
const Bonobo_Stream stream,
Bonobo_Persist_ContentType type,
void *closure,
CORBA_Environment *ev)
{
EogImageData *image_data = closure;
g_warning ("Load content from stream of type '%s'", type);
}
static gint
save_to_stream (BonoboPersistStream *ps,
const Bonobo_Stream stream,
Bonobo_Persist_ContentType type,
void *closure,
CORBA_Environment *ev)
{
EogImageData *image_data = closure;
g_warning ("Save content to stream with type '%s'", type);
}
static Bonobo_Persist_ContentTypeList *
get_supported_types (BonoboPersistStream *ps,
void *closure,
CORBA_Environment *ev)
{
return bonobo_persist_generate_content_types (
2, "text/plain", "text/html");
}
Having implemented the callbacks we then have to register them
and aggregate the interface to our object:
Aggregating a new PersistStream
EogImageData *
eog_image_data_construct (EogImageData *image_data)
{
BonoboObject *retval;
BonoboPersistStream *ps;
ps = bonobo_persist_stream_new (
load_from_stream, save_to_stream,
get_supported_types, NULL,
image_data);
if (ps == NULL) {
bonobo_object_unref (BONOBO_OBJECT (image_data));
return NULL;
}
bonobo_object_add_interface (BONOBO_OBJECT (image_data),
BONOBO_OBJECT (ps));
return image_data;
}
@parent_class:
@epv:
@load:
@save:
@get_content_types:
@ps:
@stream:
@type:
@closure:
@ev:
@ps:
@closure:
@ev:
@Returns:
@load_fn:
@save_fn:
@types_fn:
@iid:
@closure:
@Returns:
@ps:
@load_fn:
@save_fn:
@types_fn:
@iid:
@closure:
@Returns: