path: root/widgets/misc/e-attachment-handler.c

/*
 * e-attachment-handler.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-attachment-handler.h"

#define E_ATTACHMENT_HANDLER_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_ATTACHMENT_HANDLER, EAttachmentHandlerPrivate))

struct _EAttachmentHandlerPrivate {
    gpointer view;  /* weak pointer */
};

enum {
    PROP_0,
    PROP_VIEW
};

static gpointer parent_class;

static void
attachment_handler_set_view (EAttachmentHandler *handler,
                             EAttachmentView *view)
{
    g_return_if_fail (handler->priv->view == NULL);

    handler->priv->view = view;

    g_object_add_weak_pointer (
        G_OBJECT (view), &handler->priv->view);
}

static void
attachment_handler_set_property (GObject *object,
                                 guint property_id,
                                 const GValue *value,
                                 GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_VIEW:
            attachment_handler_set_view (
                E_ATTACHMENT_HANDLER (object),
                g_value_get_object (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
attachment_handler_get_property (GObject *object,
                                 guint property_id,
                                 GValue *value,
                                 GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_VIEW:
            g_value_set_object (
                value, e_attachment_handler_get_view (
                E_ATTACHMENT_HANDLER (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
attachment_handler_constructed (GObject *object)
{
    /* This allows subclasses to chain up safely since GObject
     * does not implement this method, and we might want to do
     * something here in the future. */
}

static void
attachment_handler_dispose (GObject *object)
{
    EAttachmentHandlerPrivate *priv;

    priv = E_ATTACHMENT_HANDLER_GET_PRIVATE (object);

    if (priv->view != NULL) {
        g_object_remove_weak_pointer (
            G_OBJECT (priv->view), &priv->view);
        priv->view = NULL;
    }

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

static void
attachment_handler_class_init (EAttachmentHandlerClass *class)
{
    GObjectClass *object_class;

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

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = attachment_handler_set_property;
    object_class->get_property = attachment_handler_get_property;
    object_class->constructed = attachment_handler_constructed;
    object_class->dispose = attachment_handler_dispose;

    g_object_class_install_property (
        object_class,
        PROP_VIEW,
        g_param_spec_object (
            "view",
            "View",
            NULL,
            E_TYPE_ATTACHMENT_VIEW,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT_ONLY));
}

static void
attachment_handler_init (EAttachmentHandler *handler)
{
    handler->priv = E_ATTACHMENT_HANDLER_GET_PRIVATE (handler);
}

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

    if (G_UNLIKELY (type == 0)) {
        static const GTypeInfo type_info = {
            sizeof (EAttachmentHandlerClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) attachment_handler_class_init,
            (GClassFinalizeFunc) NULL,
            NULL,  /* class_data */
            sizeof (EAttachmentHandler),
            0,     /* n_preallocs */
            (GInstanceInitFunc) attachment_handler_init,
            NULL   /* value_table */
        };

        type = g_type_register_static (
            G_TYPE_OBJECT, "EAttachmentHandler",
            &type_info, G_TYPE_FLAG_ABSTRACT);
    }

    return type;
}

EAttachmentView *
e_attachment_handler_get_view (EAttachmentHandler *handler)
{
    g_return_val_if_fail (E_IS_ATTACHMENT_HANDLER (handler), NULL);

    return E_ATTACHMENT_VIEW (handler->priv->view);
}

GdkDragAction
e_attachment_handler_get_drag_actions (EAttachmentHandler *handler)
{
    EAttachmentHandlerClass *class;

    g_return_val_if_fail (E_IS_ATTACHMENT_HANDLER (handler), 0);

    class = E_ATTACHMENT_HANDLER_GET_CLASS (handler);

    if (class->get_drag_actions != NULL)
        return class->get_drag_actions (handler);

    return 0;
}

const GtkTargetEntry *
e_attachment_handler_get_target_table (EAttachmentHandler *handler,
                                       guint *n_targets)
{
    EAttachmentHandlerClass *class;

    g_return_val_if_fail (E_IS_ATTACHMENT_HANDLER (handler), NULL);

    class = E_ATTACHMENT_HANDLER_GET_CLASS (handler);

    if (class->get_target_table != NULL)
        return class->get_target_table (handler, n_targets);

    if (n_targets != NULL)
        *n_targets = 0;

    return NULL;
}