path: root/calendar/cal-listener.c

/* GNOME calendar listener
 *
 * Copyright (C) 2000 Helix Code, Inc.
 *
 * Author: Federico Mena-Quintero <federico@helixcode.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

#include <config.h>
#include "cal-listener.h"



/* Private part of the CalListener structure */
typedef struct {
    /* The calendar this listener refers to */
    GNOME_Calendar_Cal cal;
} CalListenerPrivate;



/* Signal IDs */
enum {
    CAL_LOADED,
    OBJ_ADDED,
    OBJ_REMOVED,
    OBJ_CHANGED,
    LAST_SIGNAL
};

static void cal_listener_class_init (CalListenerClass *class);
static void cal_listener_init (CalListener *listener);
static void cal_listener_destroy (GtkObject *object);

static POA_GNOME_Calendar_Listener__vepv cal_listener_vepv;

static guint cal_listener_signals[LAST_SIGNAL];

static GnomeObjectClass *parent_class;



/**
 * cal_listener_get_type:
 * @void:
 *
 * Registers the #CalListener class if necessary, and returns the type ID
 * associated to it.
 *
 * Return value: The type ID of the #CalListener class.
 **/
GtkType
cal_listener_get_type (void)
{
    static GtkType cal_listener_type = 0;

    if (!cal_listener_type) {
        static const GtkTypeInfo cal_listener_info = {
            "CalListener",
            sizeof (CalListener),
            sizeof (CalListenerClass),
            (GtkClassInitFunc) cal_listener_class_init,
            (GtkObjectInitFunc) cal_listener_init,
            NULL, /* reserved_1 */
            NULL, /* reserved_2 */
            (GtkClassInitFunc) NULL
        };

        cal_listener_type = gtk_type_unique (gnome_object_get_type (), &cal_listener_info);
    }

    return cal_listener_type;
}

/* CORBA class initialization function for the calendar listener */
static void
init_cal_listener_corba_class (void)
{
    cal_listener_vepv.GNOME_Unknown_epv = gnome_object_get_epv ();
    cal_listener_vepv.GNOME_Calendar_Listener_epv = cal_listener_get_epv ();
}

/* Class initialization function for the calendar listener */
static void
cal_listener_class_init (CalListenerClass *class)
{
    GtkObjectClass *object_class;

    object_class = (GtkObjectClass *) class;

    parent_class = gtk_type_class (gnome_object_get_type ());

    cal_listener_signals[CAL_LOADED] =
        gtk_signal_new ("cal_loaded",
                GTK_RUN_FIRST,
                object_class->type,
                GTK_SIGNAL_OFFSET (CalListenerClass, cal_loaded),
                gtk_marshal_NONE__POINTER,
                GTK_TYPE_NONE, 1,
                GTK_TYPE_POINTER);
    cal_listener_signals[OBJ_ADDED] =
        gtk_signal_new ("obj_added",
                GTK_RUN_FIRST,
                object_class->type,
                GTK_SIGNAL_OFFSET (CalListenerClass, obj_added),
                gtk_marshal_NONE__POINTER,
                GTK_TYPE_NONE, 1,
                GTK_TYPE_POINTER);
    cal_listener_signals[OBJ_REMOVED] =
        gtk_signal_new ("obj_removed",
                GTK_RUN_FIRST,
                object_class->type,
                GTK_SIGNAL_OFFSET (CalListenerClass, obj_removed),
                gtk_marshal_NONE__POINTER,
                GTK_TYPE_NONE, 1,
                GTK_TYPE_POINTER);
    cal_listener_signals[OBJ_CHANGED] =
        gtk_signal_new ("obj_changed",
                GTK_RUN_FIRST,
                object_class->type,
                GTK_SIGNAL_OFFSET (CalListenerClass, obj_changed),
                gtk_marshal_NONE__POINTER,
                GTK_TYPE_NONE, 1,
                GTK_TYPE_POINTER);

    gtk_object_class_add_signals (object_class, cal_listener_signals, LAST_SIGNAL);

    object_class->destroy = cal_listener_destroy;

    init_cal_listener_corba_class ();
}

/* Object initialization function for the calendar listener */
static void
cal_listener_init (CalListener *listener)
{
    CalListenerPrivate *priv;

    priv = g_new0 (CalListenerPrivate, 1);
    listener->priv = priv;

    priv->cal = CORBA_OBJECT_NIL;
}

/* Returns whether a CORBA object is nil */
static gboolean
corba_object_is_nil (CORBA_Object object)
{
    CORBA_Environment ev;
    gboolean retval;

    CORBA_exception_init (&ev);
    retval = CORBA_Object_is_nil (object, &ev);
    CORBA_exception_free (&ev);

    return retval;
}

/* Destroy handler for the calendar listener */
static void
cal_listener_destroy (GtkObject *object)
{
    CalListener *listener;
    CalListenerPrivate *priv;
    CORBA_Environment ev;

    g_return_if_fail (object != NULL);
    g_return_if_fail (IS_CAL_LISTENER (object));

    listener = CAL_LISTENER (object);
    priv = listener->priv;

    CORBA_exception_init (&ev);

    if (!CORBA_Object_is_nil (priv->cal, &ev)) {
        GNOME_Unknown_unref (priv->cal, &ev);
        CORBA_Object_release (priv->cal, &ev);
    }

    g_free (priv);

    if (GTK_OBJECT_CLASS (parent_class)->destroy)
        (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}



/* CORBA servant implementation */

/* Listener::cal_loaded method */
static void
Listener_cal_loaded (PortableServer_Servant servant,
             GNOME_Calendar_Cal cal,
             CORBA_Environment *ev)
{
    CalListener *listener;
    CalListenerPrivate *priv;

    listener = CAL_LISTENER (gnome_object_from_servant (servant));
    priv = listener->priv;

    priv->cal = CORBA_Object_duplicate (cal, ev);
    GNOME_Unknown_ref (priv->cal);
    gtk_signal_emit (GTK_OBJECT (listener), cal_listener_signals[CAL_LOADED],
             cal);
}

/* Listener::obj_added method */
static void
Listener_obj_added (PortableServer_Servant servant,
            GNOME_Calendar_CalObj calobj,
            CORBA_Environment *ev)
{
    CalListener *listener;

    listener = CAL_LISTENER (gnome_object_from_servant (servant));
    gtk_signal_emit (GTK_OBJECT (listener), cal_listener_signals[OBJ_ADDED],
             calobj);
}

/* Listener::obj_removed method */
static void
Listener_obj_removed (PortableServer_Servant servant,
              GNOME_Calendar_CalObjUID uid,
              CORBA_Environment *ev)
{
    CalListener *listener;

    listener = CAL_LISTENER (gnome_object_from_servant (servant));
    gtk_signal_emit (GTK_OBJECT (listener), cal_listener_signals[OBJ_REMOVED],
             uid);
}

/* Listener::obj_changed method */
static void
Listener_obj_changed (PortableServer_Servant servant,
              GNOME_Calendar_CalObj calobj,
              CORBA_Environment *ev)
{
    CalListener *listener;

    listener = CAL_LISTENER (gnome_object_from_servant (servant));
    gtk_signal_emit (GTK_OBJECT (listener), cal_listener_signals[OBJ_CHANGED],
             calobj);
}

/**
 * cal_listener_get_epv:
 * @void:
 *
 * Creates an EPV for the Listener CORBA class.
 *
 * Return value: A newly-allocated EPV.
 **/
POA_GNOME_Calendar_Listener__epv *
cal_listener_get_epv (void)
{
    POA_GNOME_Calendar_Listener__epv *epv;

    epv = g_new0 (POA_GNOME_Calendar_Listener__epv, 1);
    epv->cal_loaded = Listener_cal_loaded;
    epv->obj_added = Listener_obj_added;
    epv->obj_removed = Listener_obj_removed;
    epv->obj_changed = Listener_obj_changed;

    return epv;
}



/* Returns whether a CORBA object is nil */
static gboolean
corba_object_is_nil (CORBA_Object object)
{
    CORBA_Environment ev;
    gboolean retval;

    CORBA_exception_init (&ev);
    retval = CORBA_Object_is_nil (object, &ev);
    CORBA_exception_free (&ev);

    return retval;
}

/**
 * cal_listener_construct:
 * @listener: A calendar listener.
 * @corba_listener: CORBA object for the calendar listener.
 *
 * Constructs a calendar listener by binding the corresponding CORBA object to
 * it.
 *
 * Return value: the same object as the @listener argument.
 **/
CalListener *
cal_listener_construct (CalListener *listener, GNOME_Calendar_Listener corba_listener)
{
    g_return_val_if_fail (listener != NULL, NULL);
    g_return_val_if_fail (IS_CAL_LISTENER (listener), NULL);
    g_return_val_if_fail (!corba_object_is_nil (corba_listener), NULL);

    gnome_object_construct (GNOME_OBJECT (listener), corba_listener);
    return listener;
}

/**
 * cal_listener_corba_object_create:
 * @object: #GnomeObject that will wrap the CORBA object.
 *
 * Creates and activates the CORBA object that is wrapped by the specified
 * calendar listener @object.
 *
 * Return value: An activated object reference or #CORBA_OBJECT_NIL in case of
 * failure.
 **/
GNOME_Calendar_Listener
cal_listener_corba_object_create (GnomeObject *object)
{
    POA_GNOME_Calendar_Listener *servant;
    CORBA_Environment ev;

    g_return_val_if_fail (object != NULL, CORBA_OBJECT_NIL);
    g_return_val_if_fail (IS_CAL_LISTENER (object), CORBA_OBJECT_NIL);

    servant = (POA_GNOME_Calendar_Listener *) g_new0 (GnomeObjectServant, 1);
    servant->vepv = &cal_listener_vepv;

    CORBA_exception_init (&ev);
    POA_GNOME_Calendar_Listener__init ((PortableServer_Servant) servant, &ev);
    if (ev._major != CORBA_NO_EXCEPTION) {
        g_free (servant);
        CORBA_exception_free (&ev);
        return CORBA_OBJECT_NIL;
    }

    CORBA_exception_free (&ev);
    return (GNOME_Calendar_Listener) gnome_object_activate_servant (object, servant);
}

/**
 * cal_listener_new:
 * @void:
 *
 * Creates a new #CalListener object.
 *
 * Return value: A newly-created #CalListener, or NULL if its corresponding
 * CORBA object could not be created.
 **/
CalListener *
cal_listener_new (void)
{
    CalListener *listener;
    GNOME_Calendar_Listener corba_listener;

    listener = gtk_type_new (CAL_LISTENER_TYPE);
    corba_listener = cal_listener_corba_object_create (GNOME_OBJECT (listener));
    if (corba_object_is_nil (corba_listener)) {
        gtk_object_destroy (listener);
        return NULL;
    }

    return cal_listener_construct (listener, corba_listener);
}

/**
 * cal_listener_get_calendar:
 * @listener: A calendar listener.
 * 
 * Queries the calendar that a listener is watching.
 * 
 * Return value: The calendar that the listener is watching.
 **/
GNOME_Calendar_Cal
cal_listener_get_calendar (CalListener *listener)
{
    CalListenerPrivate *priv;

    g_return_val_if_fail (listener != NULL, CORBA_OBJECT_NIL);
    g_return_val_if_fail (IS_CAL_LISTENER (listener), CORBA_OBJECT_NIL);

    priv = listener->priv;
    return priv->cal;
}