path: root/e-util/gal-a11y-e-cell-registry.c

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Christopher James Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "gal-a11y-e-cell.h"
#include "gal-a11y-e-cell-registry.h"

static GObjectClass *parent_class;
static GalA11yECellRegistry *default_registry;
#define PARENT_TYPE (G_TYPE_OBJECT)

struct _GalA11yECellRegistryPrivate {
    GHashTable *table;
};

/* Static functions */

static void
gal_a11y_e_cell_registry_finalize (GObject *obj)
{
    GalA11yECellRegistry *registry = GAL_A11Y_E_CELL_REGISTRY (obj);

    g_hash_table_destroy (registry->priv->table);
    g_free (registry->priv);

    G_OBJECT_CLASS (parent_class)->finalize (obj);
}

static void
gal_a11y_e_cell_registry_class_init (GalA11yECellRegistryClass *class)
{
    GObjectClass *object_class = G_OBJECT_CLASS (class);

    parent_class = g_type_class_ref (PARENT_TYPE);

    object_class->finalize = gal_a11y_e_cell_registry_finalize;
}

static void
gal_a11y_e_cell_registry_init (GalA11yECellRegistry *registry)
{
    registry->priv = g_new (GalA11yECellRegistryPrivate, 1);
    registry->priv->table = g_hash_table_new (NULL, NULL);
}

/**
 * gal_a11y_e_cell_registry_get_type:
 * @void:
 *
 * Registers the &GalA11yECellRegistry class if necessary, and returns the type ID
 * associated to it.
 *
 * Return value: The type ID of the &GalA11yECellRegistry class.
 **/
GType
gal_a11y_e_cell_registry_get_type (void)
{
    static GType type = 0;

    if (!type) {
        GTypeInfo info = {
            sizeof (GalA11yECellRegistryClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) gal_a11y_e_cell_registry_class_init,
            (GClassFinalizeFunc) NULL,
            NULL, /* class_data */
            sizeof (GalA11yECellRegistry),
            0,
            (GInstanceInitFunc) gal_a11y_e_cell_registry_init,
            NULL /* value_cell */
        };

        type = g_type_register_static (
            PARENT_TYPE, "GalA11yECellRegistry", &info, 0);
    }

    return type;
}

static void
init_default_registry (void)
{
    if (default_registry == NULL) {
        default_registry = g_object_new (gal_a11y_e_cell_registry_get_type (), NULL);
    }
}

AtkObject *
gal_a11y_e_cell_registry_get_object (GalA11yECellRegistry *registry,
                                     ETableItem *item,
                                     ECellView *cell_view,
                                     AtkObject *parent,
                                     gint model_col,
                                     gint view_col,
                                     gint row)
{
    GalA11yECellRegistryFunc func = NULL;
    GType type;

    if (registry == NULL) {
        init_default_registry ();
        registry = default_registry;
    }

    type = G_OBJECT_TYPE (cell_view->ecell);
    while (func == NULL && type != 0) {
        func = g_hash_table_lookup (registry->priv->table, GINT_TO_POINTER (type));
        type = g_type_parent (type);
    }

    if (func == NULL)
        func = gal_a11y_e_cell_new;

    return func (item, cell_view, parent, model_col, view_col, row);
}

void
gal_a11y_e_cell_registry_add_cell_type (GalA11yECellRegistry *registry,
                                        GType type,
                                        GalA11yECellRegistryFunc func)
{
    if (registry == NULL) {
        init_default_registry ();
        registry = default_registry;
    }

    g_hash_table_insert (registry->priv->table, GINT_TO_POINTER (type), func);
}