path: root/widgets/misc/e-charset-combo-box.c

/*
 * e-charset-combo-box.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/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include "e-charset-combo-box.h"

#include <glib/gi18n.h>

#include "e-util/e-charset.h"
#include "e-util/e-util.h"

#define DEFAULT_CHARSET "UTF-8"
#define OTHER_VALUE G_MAXINT

struct _ECharsetComboBoxPrivate {
    GtkActionGroup *action_group;
    GtkRadioAction *other_action;
    GHashTable *charset_index;

    /* Used when the user clicks Cancel in the character set
     * dialog. Reverts to the previous combo box setting. */
    gint previous_index;

    /* When setting the character set programmatically, this
     * prevents the custom character set dialog from running. */
    guint block_dialog : 1;
};

enum {
    PROP_0,
    PROP_CHARSET
};

G_DEFINE_TYPE (
    ECharsetComboBox,
    e_charset_combo_box,
    E_TYPE_ACTION_COMBO_BOX)

static void
charset_combo_box_entry_changed_cb (GtkEntry *entry,
                                    GtkDialog *dialog)
{
    const gchar *text;
    gboolean sensitive;

    text = gtk_entry_get_text (entry);
    sensitive = (text != NULL && *text != '\0');
    gtk_dialog_set_response_sensitive (dialog, GTK_RESPONSE_OK, sensitive);
}

static void
charset_combo_box_run_dialog (ECharsetComboBox *combo_box)
{
    GtkDialog *dialog;
    GtkEntry *entry;
    GtkWidget *container;
    GtkWidget *widget;
    GObject *object;
    gpointer parent;
    const gchar *charset;

    /* FIXME Using a dialog for this is lame.  Selecting "Other..."
     *       should unlock an entry directly in the Preferences tab.
     *       Unfortunately space in Preferences is at a premium right
     *       now, but we should revisit this when the space issue is
     *       finally resolved. */

    parent = gtk_widget_get_toplevel (GTK_WIDGET (combo_box));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    object = G_OBJECT (combo_box->priv->other_action);
    charset = g_object_get_data (object, "charset");

    widget = gtk_dialog_new_with_buttons (
        _("Character Encoding"), parent,
        GTK_DIALOG_DESTROY_WITH_PARENT,
        GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
        GTK_STOCK_OK, GTK_RESPONSE_OK, NULL);

    /* Load the broken border width defaults so we can override them. */
    gtk_widget_ensure_style (widget);

    dialog = GTK_DIALOG (widget);

    gtk_dialog_set_default_response (dialog, GTK_RESPONSE_OK);

    gtk_container_set_border_width (GTK_CONTAINER (dialog), 12);

    widget = gtk_dialog_get_action_area (dialog);
    gtk_container_set_border_width (GTK_CONTAINER (widget), 0);

    widget = gtk_dialog_get_content_area (dialog);
    gtk_box_set_spacing (GTK_BOX (widget), 12);
    gtk_container_set_border_width (GTK_CONTAINER (widget), 0);

    container = widget;

    widget = gtk_label_new (_("Enter the character set to use"));
    gtk_label_set_line_wrap (GTK_LABEL (widget), TRUE);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    widget = gtk_alignment_new (0.0, 0.0, 1.0, 1.0);
    gtk_alignment_set_padding (GTK_ALIGNMENT (widget), 0, 0, 12, 0);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_entry_new ();
    entry = GTK_ENTRY (widget);
    gtk_entry_set_activates_default (entry, TRUE);
    gtk_container_add (GTK_CONTAINER (container), widget);
    gtk_widget_show (widget);

    g_signal_connect (
        entry, "changed",
        G_CALLBACK (charset_combo_box_entry_changed_cb), dialog);

    /* Set the default text -after- connecting the signal handler.
     * This will initialize the "OK" button to the proper state. */
    gtk_entry_set_text (entry, charset);

    if (gtk_dialog_run (dialog) != GTK_RESPONSE_OK) {
        gint active;

        /* Revert to the previously selected character set. */
        combo_box->priv->block_dialog = TRUE;
        active = combo_box->priv->previous_index;
        gtk_combo_box_set_active (GTK_COMBO_BOX (combo_box), active);
        combo_box->priv->block_dialog = FALSE;

        goto exit;
    }

    charset = gtk_entry_get_text (entry);
    g_return_if_fail (charset != NULL && charset != '\0');

    g_object_set_data_full (
        object, "charset", g_strdup (charset),
        (GDestroyNotify) g_free);

exit:
    gtk_widget_destroy (GTK_WIDGET (dialog));
}

static void
charset_combo_box_notify_charset_cb (ECharsetComboBox *combo_box)
{
    GtkToggleAction *action;

    action = GTK_TOGGLE_ACTION (combo_box->priv->other_action);
    if (!gtk_toggle_action_get_active (action))
        return;

    if (combo_box->priv->block_dialog)
        return;

    /* "Other" action was selected by user. */
    charset_combo_box_run_dialog (combo_box);
}

static void
charset_combo_box_set_property (GObject *object,
                                guint property_id,
                                const GValue *value,
                                GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_CHARSET:
            e_charset_combo_box_set_charset (
                E_CHARSET_COMBO_BOX (object),
                g_value_get_string (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
charset_combo_box_get_property (GObject *object,
                                guint property_id,
                                GValue *value,
                                GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_CHARSET:
            g_value_set_string (
                value, e_charset_combo_box_get_charset (
                E_CHARSET_COMBO_BOX (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
charset_combo_box_dispose (GObject *object)
{
    ECharsetComboBoxPrivate *priv;

    priv = E_CHARSET_COMBO_BOX (object)->priv;

    if (priv->action_group != NULL) {
        g_object_unref (priv->action_group);
        priv->action_group = NULL;
    }

    if (priv->other_action != NULL) {
        g_object_unref (priv->other_action);
        priv->other_action = NULL;
    }

    g_hash_table_remove_all (priv->charset_index);

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (e_charset_combo_box_parent_class)->dispose (object);
}

static void
charset_combo_box_finalize (GObject *object)
{
    ECharsetComboBoxPrivate *priv;

    priv = E_CHARSET_COMBO_BOX (object)->priv;

    g_hash_table_destroy (priv->charset_index);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (e_charset_combo_box_parent_class)->finalize (object);
}

static void
charset_combo_box_changed (GtkComboBox *combo_box)
{
    ECharsetComboBoxPrivate *priv;

    priv = E_CHARSET_COMBO_BOX (combo_box)->priv;

    /* Chain up to parent's changed() method. */
    GTK_COMBO_BOX_CLASS (e_charset_combo_box_parent_class)->
        changed (combo_box);

    /* Notify -before- updating previous index. */
    g_object_notify (G_OBJECT (combo_box), "charset");
    priv->previous_index = gtk_combo_box_get_active (combo_box);
}

static void
e_charset_combo_box_class_init (ECharsetComboBoxClass *class)
{
    GObjectClass *object_class;
    GtkComboBoxClass *combo_box_class;

    g_type_class_add_private (class, sizeof (ECharsetComboBoxPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = charset_combo_box_set_property;
    object_class->get_property = charset_combo_box_get_property;
    object_class->dispose = charset_combo_box_dispose;
    object_class->finalize = charset_combo_box_finalize;

    combo_box_class = GTK_COMBO_BOX_CLASS (class);
    combo_box_class->changed = charset_combo_box_changed;

    g_object_class_install_property (
        object_class,
        PROP_CHARSET,
        g_param_spec_string (
            "charset",
            "Charset",
            "The selected character set",
            "UTF-8",
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));
}

static void
e_charset_combo_box_init (ECharsetComboBox *combo_box)
{
    GtkActionGroup *action_group;
    GtkRadioAction *radio_action;
    GHashTable *charset_index;
    GSList *group, *iter;

    action_group = gtk_action_group_new ("charset-combo-box-internal");

    charset_index = g_hash_table_new_full (
        g_str_hash, g_str_equal,
        (GDestroyNotify) g_free,
        (GDestroyNotify) g_object_unref);

    combo_box->priv = G_TYPE_INSTANCE_GET_PRIVATE (
        combo_box, E_TYPE_CHARSET_COMBO_BOX, ECharsetComboBoxPrivate);
    combo_box->priv->action_group = action_group;
    combo_box->priv->charset_index = charset_index;

    group = e_charset_add_radio_actions (
        action_group, "charset-", NULL, NULL, NULL);

    /* Populate the character set index. */
    for (iter = group; iter != NULL; iter = iter->next) {
        GObject *object = iter->data;
        const gchar *charset;

        charset = g_object_get_data (object, "charset");
        g_return_if_fail (charset != NULL);

        g_hash_table_insert (
            charset_index, g_strdup (charset),
            g_object_ref (object));
    }

    /* Note the "other" action is not included in the index. */

    radio_action = gtk_radio_action_new (
        "charset-other", _("Other..."), NULL, NULL, OTHER_VALUE);

    g_object_set_data (G_OBJECT (radio_action), "charset", (gpointer) "");

    gtk_radio_action_set_group (radio_action, group);
    group = gtk_radio_action_get_group (radio_action);

    e_action_combo_box_set_action (
        E_ACTION_COMBO_BOX (combo_box), radio_action);

    e_action_combo_box_add_separator_after (
        E_ACTION_COMBO_BOX (combo_box), g_slist_length (group));

    g_signal_connect (
        combo_box, "notify::charset",
        G_CALLBACK (charset_combo_box_notify_charset_cb), NULL);

    combo_box->priv->other_action = radio_action;
}

GtkWidget *
e_charset_combo_box_new (void)
{
    return g_object_new (E_TYPE_CHARSET_COMBO_BOX, NULL);
}

const gchar *
e_charset_combo_box_get_charset (ECharsetComboBox *combo_box)
{
    GtkRadioAction *radio_action;

    g_return_val_if_fail (E_IS_CHARSET_COMBO_BOX (combo_box), NULL);

    radio_action = combo_box->priv->other_action;
    radio_action = e_radio_action_get_current_action (radio_action);

    return g_object_get_data (G_OBJECT (radio_action), "charset");
}

void
e_charset_combo_box_set_charset (ECharsetComboBox *combo_box,
                                 const gchar *charset)
{
    GHashTable *charset_index;
    GtkRadioAction *radio_action;

    g_return_if_fail (E_IS_CHARSET_COMBO_BOX (combo_box));

    if (charset == NULL || *charset == '\0')
        charset = "UTF-8";

    charset_index = combo_box->priv->charset_index;
    radio_action = g_hash_table_lookup (charset_index, charset);

    if (radio_action == NULL) {
        radio_action = combo_box->priv->other_action;
        g_object_set_data_full (
            G_OBJECT (radio_action),
            "charset", g_strdup (charset),
            (GDestroyNotify) g_free);
    }

    combo_box->priv->block_dialog = TRUE;
    gtk_toggle_action_set_active (GTK_TOGGLE_ACTION (radio_action), TRUE);
    combo_box->priv->block_dialog = FALSE;
}