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diff --git a/app/core/gimpcontainer.h b/app/core/gimpcontainer.h
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimpcontainer.h
+ * Copyright (C) 2001 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/>.
+ */
+
+#ifndef __GIMP_CONTAINER_H__
+#define __GIMP_CONTAINER_H__
+
+
+#include "gimpobject.h"
+
+
+#define GIMP_TYPE_CONTAINER (gimp_container_get_type ())
+#define GIMP_CONTAINER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_CONTAINER, GimpContainer))
+#define GIMP_CONTAINER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_CONTAINER, GimpContainerClass))
+#define GIMP_IS_CONTAINER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_CONTAINER))
+#define GIMP_IS_CONTAINER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_CONTAINER))
+#define GIMP_CONTAINER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_CONTAINER, GimpContainerClass))
+
+
+typedef gboolean (* GimpContainerSearchFunc) (GimpObject *object,
+ gpointer user_data);
+
+
+typedef struct _GimpContainerClass GimpContainerClass;
+typedef struct _GimpContainerPrivate GimpContainerPrivate;
+
+struct _GimpContainer
+{
+ GimpObject parent_instance;
+
+ GimpContainerPrivate *priv;
+};
+
+struct _GimpContainerClass
+{
+ GimpObjectClass parent_class;
+
+ /* signals */
+ void (* add) (GimpContainer *container,
+ GimpObject *object);
+ void (* remove) (GimpContainer *container,
+ GimpObject *object);
+ void (* reorder) (GimpContainer *container,
+ GimpObject *object,
+ gint new_index);
+ void (* freeze) (GimpContainer *container);
+ void (* thaw) (GimpContainer *container);
+
+ /* virtual functions */
+ void (* clear) (GimpContainer *container);
+ gboolean (* have) (GimpContainer *container,
+ GimpObject *object);
+ void (* foreach) (GimpContainer *container,
+ GFunc func,
+ gpointer user_data);
+ GimpObject * (* search) (GimpContainer *container,
+ GimpContainerSearchFunc func,
+ gpointer user_data);
+ gboolean (* get_unique_names) (GimpContainer *container);
+ GimpObject * (* get_child_by_name) (GimpContainer *container,
+ const gchar *name);
+ GimpObject * (* get_child_by_index) (GimpContainer *container,
+ gint index);
+ gint (* get_child_index) (GimpContainer *container,
+ GimpObject *object);
+};
+
+
+GType gimp_container_get_type (void) G_GNUC_CONST;
+
+GType gimp_container_get_children_type (GimpContainer *container);
+GimpContainerPolicy gimp_container_get_policy (GimpContainer *container);
+gint gimp_container_get_n_children (GimpContainer *container);
+
+gboolean gimp_container_add (GimpContainer *container,
+ GimpObject *object);
+gboolean gimp_container_remove (GimpContainer *container,
+ GimpObject *object);
+gboolean gimp_container_insert (GimpContainer *container,
+ GimpObject *object,
+ gint new_index);
+gboolean gimp_container_reorder (GimpContainer *container,
+ GimpObject *object,
+ gint new_index);
+
+void gimp_container_freeze (GimpContainer *container);
+void gimp_container_thaw (GimpContainer *container);
+gboolean gimp_container_frozen (GimpContainer *container);
+gint gimp_container_freeze_count (GimpContainer *container);
+
+void gimp_container_clear (GimpContainer *container);
+gboolean gimp_container_is_empty (GimpContainer *container);
+gboolean gimp_container_have (GimpContainer *container,
+ GimpObject *object);
+void gimp_container_foreach (GimpContainer *container,
+ GFunc func,
+ gpointer user_data);
+GimpObject * gimp_container_search (GimpContainer *container,
+ GimpContainerSearchFunc func,
+ gpointer user_data);
+
+gboolean gimp_container_get_unique_names (GimpContainer *container);
+
+GimpObject * gimp_container_get_child_by_name (GimpContainer *container,
+ const gchar *name);
+GimpObject * gimp_container_get_child_by_index (GimpContainer *container,
+ gint index);
+GimpObject * gimp_container_get_first_child (GimpContainer *container);
+GimpObject * gimp_container_get_last_child (GimpContainer *container);
+gint gimp_container_get_child_index (GimpContainer *container,
+ GimpObject *object);
+
+GimpObject * gimp_container_get_neighbor_of (GimpContainer *container,
+ GimpObject *object);
+
+gchar ** gimp_container_get_name_array (GimpContainer *container,
+ gint *length);
+
+GQuark gimp_container_add_handler (GimpContainer *container,
+ const gchar *signame,
+ GCallback callback,
+ gpointer callback_data);
+void gimp_container_remove_handler (GimpContainer *container,
+ GQuark id);
+void gimp_container_remove_handlers_by_func
+ (GimpContainer *container,
+ GCallback callback,
+ gpointer callback_data);
+void gimp_container_remove_handlers_by_data
+ (GimpContainer *container,
+ gpointer callback_data);
+
+
+#endif /* __GIMP_CONTAINER_H__ */