path: root/e-util/e-dialog-widgets.c

/*
 * Evolution internal utilities - Glade dialog widget utilities
 *
 * 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:
 *      Federico Mena-Quintero <federico@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <math.h>
#include <string.h>
#include <time.h>
#include <gtk/gtk.h>

#include "e-dialog-widgets.h"

/* Converts an mapped value to the appropriate index in an item group.  The
 * values for the items are provided as a -1-terminated array.
 */
static gint
value_to_index (const gint *value_map,
                gint value)
{
    gint i;

    for (i = 0; value_map[i] != -1; i++)
        if (value_map[i] == value)
            return i;

    return -1;
}

/* Converts an index in an item group to the appropriate mapped value.  See the
 * function above.
 */
static gint
index_to_value (const gint *value_map,
                gint index)
{
    gint i;

    /* We do this the hard way, i.e. not as a simple array reference, to
     * check for correctness.
     */

    for (i = 0; value_map[i] != -1; i++)
        if (i == index)
            return value_map[i];

    return -1;
}

/**
 * e_dialog_combo_box_set:
 * @widget: A #GtkComboBox.
 * @value: Enumerated value.
 * @value_map: Map from enumeration values to array indices.
 *
 * Sets the selected item in a #GtkComboBox.  Please read the description of
 * e_dialog_radio_set() to see how @value_map maps enumeration values to item
 * indices.
 **/
void
e_dialog_combo_box_set (GtkWidget *widget,
                        gint value,
                        const gint *value_map)
{
    gint i;

    g_return_if_fail (GTK_IS_COMBO_BOX (widget));
    g_return_if_fail (value_map != NULL);

    i = value_to_index (value_map, value);

    if (i != -1)
        gtk_combo_box_set_active (GTK_COMBO_BOX (widget), i);
    else
        g_message (
            "e_dialog_combo_box_set(): could not "
            "find value %d in value map!", value);
}

/**
 * e_dialog_combo_box_get:
 * @widget: A #GtkComboBox.
 * @value_map: Map from enumeration values to array indices.
 *
 * Queries the selected item in a #GtkComboBox.  Please read the description
 * of e_dialog_radio_set() to see how @value_map maps enumeration values to item
 * indices.
 *
 * Return value: Enumeration value which corresponds to the selected item in the
 * combo box.
 **/
gint
e_dialog_combo_box_get (GtkWidget *widget,
                        const gint *value_map)
{
    gint active;
    gint i;

    g_return_val_if_fail (GTK_IS_COMBO_BOX (widget), -1);
    g_return_val_if_fail (value_map != NULL, -1);

    active = gtk_combo_box_get_active (GTK_COMBO_BOX (widget));
    i = index_to_value (value_map, active);

    if (i == -1) {
        g_message (
            "e_dialog_combo_box_get(): could not "
            "find index %d in value map!", i);
        return -1;
    }

    return i;
}