path: root/e-util/e-iterator.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Authors: 
 *   Christopher James Lahey <clahey@umich.edu>
 *
 * Copyright (C) 2000 Helix Code, Inc.
 * Copyright (C) 1999 The Free Software Foundation
 */

#include <config.h>

#include <gtk/gtksignal.h>
#include "e-iterator.h"

#define ECI_CLASS(object) (E_ITERATOR_CLASS(GTK_OBJECT((object))->klass))

static void e_iterator_init (EIterator *card);
static void e_iterator_class_init (EIteratorClass *klass);

#define PARENT_TYPE (gtk_object_get_type ())

static GtkObjectClass *parent_class;

enum {
    INVALIDATE,
    LAST_SIGNAL
};

static guint e_iterator_signals [LAST_SIGNAL] = { 0, };

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

    if (!type) {
        GtkTypeInfo info = {
            "EIterator",
            sizeof (EIterator),
            sizeof (EIteratorClass),
            (GtkClassInitFunc) e_iterator_class_init,
            (GtkObjectInitFunc) e_iterator_init,
            NULL, /* reserved_1 */
            NULL, /* reserved_2 */
            (GtkClassInitFunc) NULL
        };

        type = gtk_type_unique (PARENT_TYPE, &info);
    }

    return type;
}

static void
e_iterator_class_init (EIteratorClass *klass)
{
    GtkObjectClass *object_class;

    object_class = GTK_OBJECT_CLASS(klass);

    parent_class = gtk_type_class (PARENT_TYPE);

    e_iterator_signals [INVALIDATE] =
        gtk_signal_new ("invalidate",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (EIteratorClass, invalidate),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);

    gtk_object_class_add_signals (object_class, e_iterator_signals, LAST_SIGNAL);

    klass->invalidate = NULL;
    klass->get        = NULL;
    klass->reset      = NULL;
    klass->last       = NULL;
    klass->next       = NULL;
    klass->prev       = NULL;
    klass->delete     = NULL;
    klass->insert     = NULL;
    klass->set        = NULL;
    klass->is_valid   = NULL;
}

/**
 * e_iterator_init:
 */
static void
e_iterator_init (EIterator *card)
{
}

/*
 * Virtual functions: 
 */
const void *
e_iterator_get      (EIterator *iterator)
{
    if (ECI_CLASS(iterator)->get)
        return ECI_CLASS(iterator)->get(iterator);
    else
        return NULL;
}

void
e_iterator_reset    (EIterator *iterator)
{
    if (ECI_CLASS(iterator)->reset)
        ECI_CLASS(iterator)->reset(iterator);
}

void
e_iterator_last     (EIterator *iterator)
{
    if (ECI_CLASS(iterator)->last)
        ECI_CLASS(iterator)->last(iterator);
}

gboolean
e_iterator_next     (EIterator *iterator)
{
    if (ECI_CLASS(iterator)->next)
        return ECI_CLASS(iterator)->next(iterator);
    else
        return FALSE;
}

gboolean
e_iterator_prev     (EIterator *iterator)
{
    if (ECI_CLASS(iterator)->prev)
        return ECI_CLASS(iterator)->prev(iterator);
    else
        return FALSE;
}

void
e_iterator_delete   (EIterator *iterator)
{
    if (ECI_CLASS(iterator)->delete)
        ECI_CLASS(iterator)->delete(iterator);
}

void           e_iterator_insert     (EIterator  *iterator,
                      const void *object,
                      gboolean    before)
{
    if (ECI_CLASS(iterator)->insert)
        ECI_CLASS(iterator)->insert(iterator, object, before);
}

void
e_iterator_set      (EIterator *iterator,
              const void    *object)
{
    if (ECI_CLASS(iterator)->set)
        ECI_CLASS(iterator)->set(iterator, object);
}

gboolean
e_iterator_is_valid (EIterator *iterator)
{
    if (ECI_CLASS(iterator)->is_valid)
        return ECI_CLASS(iterator)->is_valid(iterator);
    else
        return FALSE;
}

void
e_iterator_invalidate (EIterator *iterator)
{
    g_return_if_fail (iterator != NULL);
    g_return_if_fail (E_IS_ITERATOR (iterator));

    gtk_signal_emit (GTK_OBJECT (iterator),
             e_iterator_signals [INVALIDATE]);
}