PIKApp/app/core/pikatreehandler.c

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2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* PikaTreeHandler
* Copyright (C) 2009 Michael Natterer <mitch@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* 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 General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "core-types.h"
#include "pikacontainer.h"
#include "pikatreehandler.h"
#include "pikaviewable.h"
static void pika_tree_handler_dispose (GObject *object);
static void pika_tree_handler_freeze (PikaTreeHandler *handler,
PikaContainer *container);
static void pika_tree_handler_thaw (PikaTreeHandler *handler,
PikaContainer *container);
static void pika_tree_handler_add_container (PikaTreeHandler *handler,
PikaContainer *container);
static void pika_tree_handler_add_foreach (PikaViewable *viewable,
PikaTreeHandler *handler);
static void pika_tree_handler_add (PikaTreeHandler *handler,
PikaViewable *viewable,
PikaContainer *container);
static void pika_tree_handler_remove_container (PikaTreeHandler *handler,
PikaContainer *container);
static void pika_tree_handler_remove_foreach (PikaViewable *viewable,
PikaTreeHandler *handler);
static void pika_tree_handler_remove (PikaTreeHandler *handler,
PikaViewable *viewable,
PikaContainer *container);
G_DEFINE_TYPE (PikaTreeHandler, pika_tree_handler, PIKA_TYPE_OBJECT)
#define parent_class pika_tree_handler_parent_class
static void
pika_tree_handler_class_init (PikaTreeHandlerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = pika_tree_handler_dispose;
}
static void
pika_tree_handler_init (PikaTreeHandler *handler)
{
}
static void
pika_tree_handler_dispose (GObject *object)
{
PikaTreeHandler *handler = PIKA_TREE_HANDLER (object);
if (handler->container)
{
g_signal_handlers_disconnect_by_func (handler->container,
pika_tree_handler_freeze,
handler);
g_signal_handlers_disconnect_by_func (handler->container,
pika_tree_handler_thaw,
handler);
if (! pika_container_frozen (handler->container))
pika_tree_handler_remove_container (handler, handler->container);
g_clear_object (&handler->container);
g_clear_pointer (&handler->signal_name, g_free);
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
/* public functions */
PikaTreeHandler *
pika_tree_handler_connect (PikaContainer *container,
const gchar *signal_name,
GCallback callback,
gpointer user_data)
{
PikaTreeHandler *handler;
g_return_val_if_fail (PIKA_IS_CONTAINER (container), NULL);
g_return_val_if_fail (signal_name != NULL, NULL);
handler = g_object_new (PIKA_TYPE_TREE_HANDLER, NULL);
handler->container = g_object_ref (container);
handler->signal_name = g_strdup (signal_name);
handler->callback = callback;
handler->user_data = user_data;
if (! pika_container_frozen (container))
pika_tree_handler_add_container (handler, container);
g_signal_connect_object (container, "freeze",
G_CALLBACK (pika_tree_handler_freeze),
handler,
G_CONNECT_SWAPPED);
g_signal_connect_object (container, "thaw",
G_CALLBACK (pika_tree_handler_thaw),
handler,
G_CONNECT_SWAPPED);
return handler;
}
void
pika_tree_handler_disconnect (PikaTreeHandler *handler)
{
g_return_if_fail (PIKA_IS_TREE_HANDLER (handler));
g_object_run_dispose (G_OBJECT (handler));
g_object_unref (handler);
}
/* private functions */
static void
pika_tree_handler_freeze (PikaTreeHandler *handler,
PikaContainer *container)
{
pika_tree_handler_remove_container (handler, container);
}
static void
pika_tree_handler_thaw (PikaTreeHandler *handler,
PikaContainer *container)
{
pika_tree_handler_add_container (handler, container);
}
static void
pika_tree_handler_add_container (PikaTreeHandler *handler,
PikaContainer *container)
{
pika_container_foreach (container,
(GFunc) pika_tree_handler_add_foreach,
handler);
g_signal_connect_object (container, "add",
G_CALLBACK (pika_tree_handler_add),
handler,
G_CONNECT_SWAPPED);
g_signal_connect_object (container, "remove",
G_CALLBACK (pika_tree_handler_remove),
handler,
G_CONNECT_SWAPPED);
}
static void
pika_tree_handler_add_foreach (PikaViewable *viewable,
PikaTreeHandler *handler)
{
pika_tree_handler_add (handler, viewable, NULL);
}
static void
pika_tree_handler_add (PikaTreeHandler *handler,
PikaViewable *viewable,
PikaContainer *unused)
{
PikaContainer *children = pika_viewable_get_children (viewable);
g_signal_connect (viewable,
handler->signal_name,
handler->callback,
handler->user_data);
if (children)
pika_tree_handler_add_container (handler, children);
}
static void
pika_tree_handler_remove_container (PikaTreeHandler *handler,
PikaContainer *container)
{
g_signal_handlers_disconnect_by_func (container,
pika_tree_handler_add,
handler);
g_signal_handlers_disconnect_by_func (container,
pika_tree_handler_remove,
handler);
pika_container_foreach (container,
(GFunc) pika_tree_handler_remove_foreach,
handler);
}
static void
pika_tree_handler_remove_foreach (PikaViewable *viewable,
PikaTreeHandler *handler)
{
pika_tree_handler_remove (handler, viewable, NULL);
}
static void
pika_tree_handler_remove (PikaTreeHandler *handler,
PikaViewable *viewable,
PikaContainer *unused)
{
PikaContainer *children = pika_viewable_get_children (viewable);
if (children)
pika_tree_handler_remove_container (handler, children);
g_signal_handlers_disconnect_by_func (viewable,
handler->callback,
handler->user_data);
}