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/*
 * e-mail-config-service-notebook.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.
 *
 * 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 General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "e-mail-config-service-notebook.h"

#define E_MAIL_CONFIG_SERVICE_NOTEBOOK_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_MAIL_CONFIG_SERVICE_NOTEBOOK, EMailConfigServiceNotebookPrivate))

#define CHILD_BACKEND_KEY_FORMAT \
    "__e_mail_config_service_notebook_%p_child_backend__"

struct _EMailConfigServiceNotebookPrivate {
    EMailConfigServiceBackend *active_backend;
    gchar *child_backend_key;
};

enum {
    PROP_0,
    PROP_ACTIVE_BACKEND
};

enum {
    PROP_CHILD_0,
    PROP_CHILD_BACKEND
};

G_DEFINE_TYPE (
    EMailConfigServiceNotebook,
    e_mail_config_service_notebook,
    GTK_TYPE_NOTEBOOK)

static void
mail_config_service_notebook_set_child_backend (EMailConfigServiceNotebook *notebook,
                                                GtkWidget *child,
                                                EMailConfigServiceBackend *backend)
{
    const gchar *key;

    key = notebook->priv->child_backend_key;

    if (E_IS_MAIL_CONFIG_SERVICE_BACKEND (backend))
        g_object_set_data_full (
            G_OBJECT (child), key,
            g_object_ref (backend),
            (GDestroyNotify) g_object_unref);
}

static EMailConfigServiceBackend *
mail_config_service_notebook_get_child_backend (EMailConfigServiceNotebook *notebook,
                                                GtkWidget *child)
{
    const gchar *key;

    key = notebook->priv->child_backend_key;

    return g_object_get_data (G_OBJECT (child), key);
}

static gboolean
mail_config_service_notebook_page_num_to_backend (GBinding *binding,
                                                  const GValue *source_value,
                                                  GValue *target_value,
                                                  gpointer user_data)
{
    EMailConfigServiceBackend *backend;
    GtkNotebook *notebook;
    GtkWidget *child;
    gint page_num;

    /* The binding's source and target are the same instance. */
    notebook = GTK_NOTEBOOK (g_binding_get_source (binding));

    page_num = g_value_get_int (source_value);
    child = gtk_notebook_get_nth_page (notebook, page_num);

    if (child != NULL)
        backend = mail_config_service_notebook_get_child_backend (
            E_MAIL_CONFIG_SERVICE_NOTEBOOK (notebook), child);
    else
        backend = NULL;

    g_value_set_object (target_value, backend);

    return TRUE;
}

static gboolean
mail_config_service_notebook_backend_to_page_num (GBinding *binding,
                                                  const GValue *source_value,
                                                  GValue *target_value,
                                                  gpointer user_data)
{
    EMailConfigServiceBackend *backend;
    GtkNotebook *notebook;
    gint n_pages, ii;

    /* The binding's source and target are the same instance. */
    notebook = GTK_NOTEBOOK (g_binding_get_source (binding));

    backend = g_value_get_object (source_value);
    n_pages = gtk_notebook_get_n_pages (notebook);

    for (ii = 0; ii < n_pages; ii++) {
        GtkWidget *child;
        EMailConfigServiceBackend *candidate;

        child = gtk_notebook_get_nth_page (notebook, ii);
        candidate = mail_config_service_notebook_get_child_backend (
            E_MAIL_CONFIG_SERVICE_NOTEBOOK (notebook), child);

        if (backend == candidate) {
            g_value_set_int (target_value, ii);
            return TRUE;
        }
    }

    return FALSE;
}

static void
mail_config_service_notebook_set_property (GObject *object,
                                           guint property_id,
                                           const GValue *value,
                                           GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_ACTIVE_BACKEND:
            e_mail_config_service_notebook_set_active_backend (
                E_MAIL_CONFIG_SERVICE_NOTEBOOK (object),
                g_value_get_object (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
mail_config_service_notebook_get_property (GObject *object,
                                           guint property_id,
                                           GValue *value,
                                           GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_ACTIVE_BACKEND:
            g_value_set_object (
                value,
                e_mail_config_service_notebook_get_active_backend (
                E_MAIL_CONFIG_SERVICE_NOTEBOOK (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
mail_config_service_notebook_dispose (GObject *object)
{
    EMailConfigServiceNotebookPrivate *priv;

    priv = E_MAIL_CONFIG_SERVICE_NOTEBOOK_GET_PRIVATE (object);

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

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

static void
mail_config_service_notebook_finalize (GObject *object)
{
    EMailConfigServiceNotebookPrivate *priv;

    priv = E_MAIL_CONFIG_SERVICE_NOTEBOOK_GET_PRIVATE (object);

    g_free (priv->child_backend_key);

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

static void
mail_config_service_notebook_constructed (GObject *object)
{
    /* Chain up to parent's constructed() method. */
    G_OBJECT_CLASS (e_mail_config_service_notebook_parent_class)->
        constructed (object);

    gtk_notebook_set_show_tabs (GTK_NOTEBOOK (object), FALSE);
    gtk_notebook_set_show_border (GTK_NOTEBOOK (object), FALSE);

    /* Current page is still -1 so skip G_BINDING_SYNC_CREATE. */
    g_object_bind_property_full (
        object, "page",
        object, "active-backend",
        G_BINDING_BIDIRECTIONAL,
        mail_config_service_notebook_page_num_to_backend,
        mail_config_service_notebook_backend_to_page_num,
        NULL, (GDestroyNotify) NULL);
}

static void
mail_config_service_notebook_set_child_property (GtkContainer *container,
                                                 GtkWidget *child,
                                                 guint property_id,
                                                 const GValue *value,
                                                 GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_CHILD_BACKEND:
            mail_config_service_notebook_set_child_backend (
                E_MAIL_CONFIG_SERVICE_NOTEBOOK (container),
                child, g_value_get_object (value));
            return;
    }

    GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (
        container, property_id, pspec);
}

static void
mail_config_service_notebook_get_child_property (GtkContainer *container,
                                                 GtkWidget *child,
                                                 guint property_id,
                                                 GValue *value,
                                                 GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_CHILD_BACKEND:
            g_value_set_object (
                value,
                mail_config_service_notebook_get_child_backend (
                E_MAIL_CONFIG_SERVICE_NOTEBOOK (container), child));
            return;
    }

    GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (
        container, property_id, pspec);
}

static void
e_mail_config_service_notebook_class_init (EMailConfigServiceNotebookClass *class)
{
    GObjectClass *object_class;
    GtkContainerClass *container_class;

    g_type_class_add_private (
        class, sizeof (EMailConfigServiceNotebookPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = mail_config_service_notebook_set_property;
    object_class->get_property = mail_config_service_notebook_get_property;
    object_class->dispose = mail_config_service_notebook_dispose;
    object_class->finalize = mail_config_service_notebook_finalize;
    object_class->constructed = mail_config_service_notebook_constructed;

    container_class = GTK_CONTAINER_CLASS (class);
    container_class->set_child_property = mail_config_service_notebook_set_child_property;
    container_class->get_child_property = mail_config_service_notebook_get_child_property;

    g_object_class_install_property (
        object_class,
        PROP_ACTIVE_BACKEND,
        g_param_spec_object (
            "active-backend",
            "Active Backend",
            "The service backend for the current page",
            E_TYPE_MAIL_CONFIG_SERVICE_BACKEND,
            G_PARAM_READWRITE |
            G_PARAM_STATIC_STRINGS));

    /* Child property for notebook pages. */
    gtk_container_class_install_child_property (
        container_class,
        PROP_CHILD_BACKEND,
        g_param_spec_object (
            "backend",
            "Backend",
            "The service backend for this page",
            E_TYPE_MAIL_CONFIG_SERVICE_BACKEND,
            G_PARAM_READWRITE |
            G_PARAM_STATIC_STRINGS));
}

static void
e_mail_config_service_notebook_init (EMailConfigServiceNotebook *notebook)
{
    gchar *key;

    notebook->priv = E_MAIL_CONFIG_SERVICE_NOTEBOOK_GET_PRIVATE (notebook);

    key = g_strdup_printf (CHILD_BACKEND_KEY_FORMAT, notebook);
    notebook->priv->child_backend_key = key;
}

GtkWidget *
e_mail_config_service_notebook_new (void)
{
    return g_object_new (E_TYPE_MAIL_CONFIG_SERVICE_NOTEBOOK, NULL);
}

gint
e_mail_config_service_notebook_add_page (EMailConfigServiceNotebook *notebook,
                                         EMailConfigServiceBackend *backend,
                                         GtkWidget *child)
{
    g_return_val_if_fail (E_IS_MAIL_CONFIG_SERVICE_NOTEBOOK (notebook), -1);
    g_return_val_if_fail (E_IS_MAIL_CONFIG_SERVICE_BACKEND (backend), -1);
    g_return_val_if_fail (GTK_IS_WIDGET (child), -1);

    gtk_widget_show (child);

    mail_config_service_notebook_set_child_backend (
        notebook, child, backend);

    return gtk_notebook_append_page (GTK_NOTEBOOK (notebook), child, NULL);
}

EMailConfigServiceBackend *
e_mail_config_service_notebook_get_active_backend (EMailConfigServiceNotebook *notebook)
{
    g_return_val_if_fail (
        E_IS_MAIL_CONFIG_SERVICE_NOTEBOOK (notebook), NULL);

    return notebook->priv->active_backend;
}

void
e_mail_config_service_notebook_set_active_backend (EMailConfigServiceNotebook *notebook,
                                                   EMailConfigServiceBackend *backend)
{
    g_return_if_fail (E_IS_MAIL_CONFIG_SERVICE_NOTEBOOK (notebook));

    if (notebook->priv->active_backend == backend)
        return;

    if (backend != NULL) {
        g_return_if_fail (E_IS_MAIL_CONFIG_SERVICE_BACKEND (backend));
        g_object_ref (backend);
    }

    if (notebook->priv->active_backend != NULL)
        g_object_unref (notebook->priv->active_backend);

    notebook->priv->active_backend = backend;

    g_object_notify (G_OBJECT (notebook), "active-backend");
}