path: root/widgets/misc/e-signature-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)
 *
 */

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

#include <glib/gi18n.h>

#define E_SIGNATURE_COMBO_BOX_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_SIGNATURE_COMBO_BOX, ESignatureComboBoxPrivate))

enum {
    COLUMN_STRING,
    COLUMN_SIGNATURE
};

enum {
    REFRESHED,
    LAST_SIGNAL
};

struct _ESignatureComboBoxPrivate {
    ESignatureList *signature_list;
    GHashTable *index;
};

static gpointer parent_class;
static guint signal_ids[LAST_SIGNAL];

static void
signature_combo_box_refresh_cb (ESignatureList *signature_list,
                                ESignature *unused,
                                ESignatureComboBox *combo_box)
{
    GtkListStore *store;
    GtkTreeModel *model;
    GtkTreeIter tree_iter;
    EIterator *signature_iter;
    ESignature *signature;
    GHashTable *index;
    GList *list = NULL;
    GList *iter;

    store = gtk_list_store_new (2, G_TYPE_STRING, E_TYPE_SIGNATURE);
    model = GTK_TREE_MODEL (store);
    index = combo_box->priv->index;

    g_hash_table_remove_all (index);

    gtk_list_store_append (store, &tree_iter);
    gtk_list_store_set (
        store, &tree_iter,
        COLUMN_STRING, _("None"),
        COLUMN_SIGNATURE, NULL, -1);

    if (signature_list == NULL)
        goto skip;

    /* Build a list of ESignatures to display. */
    signature_iter = e_list_get_iterator (E_LIST (signature_list));
    while (e_iterator_is_valid (signature_iter)) {

        /* XXX EIterator misuses const. */
        signature = (ESignature *) e_iterator_get (signature_iter);
        list = g_list_prepend (list, signature);
        e_iterator_next (signature_iter);
    }
    g_object_unref (signature_iter);

    list = g_list_reverse (list);

    /* Populate the list store and index. */
    for (iter = list; iter != NULL; iter = iter->next) {
        GtkTreeRowReference *reference;
        GtkTreePath *path;
        const gchar *string;

        signature = iter->data;

        if (signature->autogen)
            string = _("Autogenerated");
        else
            string = signature->name;

        gtk_list_store_append (store, &tree_iter);
        gtk_list_store_set (
            store, &tree_iter,
            COLUMN_STRING, string,
            COLUMN_SIGNATURE, signature, -1);

        path = gtk_tree_model_get_path (model, &tree_iter);
        reference = gtk_tree_row_reference_new (model, path);
        g_hash_table_insert (index, signature, reference);
        gtk_tree_path_free (path);
    }

skip:
    /* Restore the previously selected signature. */
    signature = e_signature_combo_box_get_active (combo_box);
    if (signature != NULL)
        g_object_ref (signature);
    gtk_combo_box_set_model (GTK_COMBO_BOX (combo_box), model);
    e_signature_combo_box_set_active (combo_box, signature);
    if (signature != NULL)
        g_object_unref (signature);

    g_signal_emit (combo_box, signal_ids[REFRESHED], 0);
}

static GObject *
signature_combo_box_constructor (GType type,
                                 guint n_construct_properties,
                                 GObjectConstructParam *construct_properties)
{
    GObject *object;
    GtkCellRenderer *renderer;

    /* Chain up to parent's constructor() method. */
    object = G_OBJECT_CLASS (parent_class)->constructor (
        type, n_construct_properties, construct_properties);

    renderer = gtk_cell_renderer_text_new ();

    gtk_cell_layout_pack_start (
        GTK_CELL_LAYOUT (object), renderer, TRUE);
    gtk_cell_layout_add_attribute (
        GTK_CELL_LAYOUT (object), renderer, "text", COLUMN_STRING);

    e_signature_combo_box_set_signature_list (
        E_SIGNATURE_COMBO_BOX (object), NULL);

    return object;
}

static void
signature_combo_box_dispose (GObject *object)
{
    ESignatureComboBoxPrivate *priv;

    priv = E_SIGNATURE_COMBO_BOX_GET_PRIVATE (object);

    if (priv->signature_list != NULL) {
        g_signal_handlers_disconnect_by_func (
            priv->signature_list,
            signature_combo_box_refresh_cb, object);
        g_object_unref (priv->signature_list);
        priv->signature_list = NULL;
    }

    g_hash_table_remove_all (priv->index);

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

static void
signature_combo_box_finalize (GObject *object)
{
    ESignatureComboBoxPrivate *priv;

    priv = E_SIGNATURE_COMBO_BOX_GET_PRIVATE (object);

    g_hash_table_destroy (priv->index);

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

static void
signature_combo_box_class_init (ESignatureComboBoxClass *class)
{
    GObjectClass *object_class;

    parent_class = g_type_class_peek_parent (class);
    g_type_class_add_private (class, sizeof (ESignatureComboBoxPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->constructor = signature_combo_box_constructor;
    object_class->dispose = signature_combo_box_dispose;
    object_class->finalize = signature_combo_box_finalize;

    signal_ids[REFRESHED] = g_signal_new (
        "refreshed",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        0, NULL, NULL,
        g_cclosure_marshal_VOID__VOID,
        G_TYPE_NONE, 0);
}

static void
signature_combo_box_init (ESignatureComboBox *combo_box)
{
    GHashTable *index;

    /* Reverse-lookup index */
    index = g_hash_table_new_full (
        g_direct_hash, g_direct_equal,
        (GDestroyNotify) g_object_unref,
        (GDestroyNotify) gtk_tree_row_reference_free);

    combo_box->priv = E_SIGNATURE_COMBO_BOX_GET_PRIVATE (combo_box);
    combo_box->priv->index = index;
}

GType
e_signature_combo_box_get_type (void)
{
    static GType type = 0;

    if (G_UNLIKELY (type == 0)) {
        static const GTypeInfo type_info = {
            sizeof (ESignatureComboBoxClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) signature_combo_box_class_init,
            (GClassFinalizeFunc) NULL,
            NULL,  /* class_data */
            sizeof (ESignatureComboBox),
            0,     /* n_preallocs */
            (GInstanceInitFunc) signature_combo_box_init,
            NULL  /* value_table */
        };

        type = g_type_register_static (
            GTK_TYPE_COMBO_BOX, "ESignatureComboBox",
            &type_info, 0);
    }

    return type;
}

GtkWidget *
e_signature_combo_box_new (void)
{
    return g_object_new (E_TYPE_SIGNATURE_COMBO_BOX, NULL);
}

ESignatureList *
e_signature_combo_box_get_signature_list (ESignatureComboBox *combo_box)
{
    g_return_val_if_fail (E_IS_SIGNATURE_COMBO_BOX (combo_box), NULL);

    return combo_box->priv->signature_list;
}

void
e_signature_combo_box_set_signature_list (ESignatureComboBox *combo_box,
                                          ESignatureList *signature_list)
{
    ESignatureComboBoxPrivate *priv;

    g_return_if_fail (E_IS_SIGNATURE_COMBO_BOX (combo_box));

    if (signature_list != NULL)
        g_return_if_fail (E_IS_SIGNATURE_LIST (signature_list));

    priv = E_SIGNATURE_COMBO_BOX_GET_PRIVATE (combo_box);

    if (priv->signature_list != NULL) {
        g_signal_handlers_disconnect_by_func (
            priv->signature_list,
            signature_combo_box_refresh_cb, combo_box);
        g_object_unref (priv->signature_list);
        priv->signature_list = NULL;
    }

    if (signature_list != NULL) {
        priv->signature_list = g_object_ref (signature_list);

        /* Listen for changes to the signature list. */
        g_signal_connect (
            priv->signature_list, "signature-added",
            G_CALLBACK (signature_combo_box_refresh_cb),
            combo_box);
        g_signal_connect (
            priv->signature_list, "signature-changed",
            G_CALLBACK (signature_combo_box_refresh_cb),
            combo_box);
        g_signal_connect (
            priv->signature_list, "signature-removed",
            G_CALLBACK (signature_combo_box_refresh_cb),
            combo_box);
    }

    signature_combo_box_refresh_cb (signature_list, NULL, combo_box);
}

ESignature *
e_signature_combo_box_get_active (ESignatureComboBox *combo_box)
{
    ESignature *signature;
    GtkTreeModel *model;
    GtkTreeIter iter;
    gboolean iter_set;

    g_return_val_if_fail (E_IS_SIGNATURE_COMBO_BOX (combo_box), NULL);

    iter_set = gtk_combo_box_get_active_iter (
        GTK_COMBO_BOX (combo_box), &iter);
    if (!iter_set)
        return NULL;

    model = gtk_combo_box_get_model (GTK_COMBO_BOX (combo_box));
    gtk_tree_model_get (model, &iter, COLUMN_SIGNATURE, &signature, -1);

    return signature;
}

gboolean
e_signature_combo_box_set_active (ESignatureComboBox *combo_box,
                                  ESignature *signature)
{
    GtkTreeRowReference *reference;
    GtkTreeModel *model;
    GtkTreePath *path;
    GtkTreeIter iter;
    gboolean iter_set;

    g_return_val_if_fail (E_IS_SIGNATURE_COMBO_BOX (combo_box), FALSE);

    if (signature != NULL)
        g_return_val_if_fail (E_IS_SIGNATURE (signature), FALSE);

    /* NULL means select "None" (always the first item). */
    if (signature == NULL) {
        gtk_combo_box_set_active (GTK_COMBO_BOX (combo_box), 0);
        return TRUE;
    }

    /* Lookup the tree row reference for the signature. */
    reference = g_hash_table_lookup (combo_box->priv->index, signature);
    if (reference == NULL)
        return FALSE;

    /* Convert the reference to a tree iterator. */
    path = gtk_tree_row_reference_get_path (reference);
    model = gtk_combo_box_get_model (GTK_COMBO_BOX (combo_box));
    iter_set = gtk_tree_model_get_iter (model, &iter, path);
    gtk_tree_path_free (path);

    if (!iter_set)
        return FALSE;

    /* Activate the corresponding combo box item. */
    gtk_combo_box_set_active_iter (GTK_COMBO_BOX (combo_box), &iter);

    return TRUE;
}