gimp/app/core/gimpundostack.c

208 lines
5.1 KiB
C

/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <glib-object.h>
#include "core-types.h"
#include "gimpimage.h"
#include "gimplist.h"
#include "gimpundo.h"
#include "gimpundostack.h"
static void gimp_undo_stack_class_init (GimpUndoStackClass *klass);
static void gimp_undo_stack_init (GimpUndoStack *stack);
static void gimp_undo_stack_finalize (GObject *object);
static void gimp_undo_stack_add_callback (GimpContainer *container,
GimpObject *object,
gpointer data);
static void gimp_undo_stack_remove_callback (GimpContainer *container,
GimpObject *object,
gpointer data);
static GimpUndoClass *parent_class = NULL;
GType
gimp_undo_stack_get_type (void)
{
static GType undo_stack_type = 0;
if (! undo_stack_type)
{
static const GTypeInfo undo_stack_info =
{
sizeof (GimpUndoStackClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_undo_stack_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpUndoStack),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_undo_stack_init,
};
undo_stack_type = g_type_register_static (GIMP_TYPE_UNDO,
"GimpUndoStack",
&undo_stack_info, 0);
}
return undo_stack_type;
}
static void
gimp_undo_stack_class_init (GimpUndoStackClass *klass)
{
GObjectClass *object_class;
object_class = G_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = gimp_undo_stack_finalize;
}
static void
gimp_undo_stack_init (GimpUndoStack *stack)
{
GimpContainer *undos;
undos = gimp_list_new (GIMP_TYPE_UNDO,
GIMP_CONTAINER_POLICY_STRONG);
stack->undos = undos;
g_signal_connect (G_OBJECT (undos), "add",
G_CALLBACK (gimp_undo_stack_add_callback),
stack);
g_signal_connect (G_OBJECT (undos), "remove",
G_CALLBACK (gimp_undo_stack_remove_callback),
stack);
stack->gimage = NULL;
}
static void
gimp_undo_stack_finalize (GObject *object)
{
GimpUndoStack *stack;
stack = GIMP_UNDO_STACK (object);
if (stack->undos)
{
g_object_unref (G_OBJECT (stack->undos));
stack->undos = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
GimpUndoStack *
gimp_undo_stack_new (GimpImage *gimage)
{
GimpUndoStack *stack;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
stack = GIMP_UNDO_STACK (g_object_new (GIMP_TYPE_UNDO_STACK, NULL));
stack->gimage = gimage;
return stack;
}
void
gimp_undo_stack_push (GimpUndoStack *stack,
GimpUndo *undo)
{
g_return_if_fail (GIMP_IS_UNDO_STACK (stack));
g_return_if_fail (GIMP_IS_UNDO (undo));
gimp_undo_push (undo, stack->gimage);
gimp_container_add (GIMP_CONTAINER (stack->undos), GIMP_OBJECT (undo));
g_object_unref (G_OBJECT (undo));
}
GimpUndo *
gimp_undo_stack_pop (GimpUndoStack *stack)
{
GimpObject *object;
g_return_val_if_fail (GIMP_IS_UNDO_STACK (stack), NULL);
object = gimp_container_get_child_by_index (GIMP_CONTAINER (stack->undos),0);
if (object)
{
gimp_container_remove (GIMP_CONTAINER (stack->undos), object);
gimp_undo_pop (GIMP_UNDO (object), stack->gimage);
return GIMP_UNDO (object);
}
return NULL;
}
GimpUndo *
gimp_undo_stack_peek (GimpUndoStack *stack)
{
GimpObject *object;
g_return_val_if_fail (GIMP_IS_UNDO_STACK (stack), NULL);
object = gimp_container_get_child_by_index (GIMP_CONTAINER (stack->undos), 0);
return (object ? GIMP_UNDO (object) : NULL);
}
static void
gimp_undo_stack_add_callback (GimpContainer *container,
GimpObject *object,
gpointer data)
{
GimpUndo *undo;
GimpUndo *stack;
undo = GIMP_UNDO (object);
stack = GIMP_UNDO (data);
stack->size += undo->size;
}
static void
gimp_undo_stack_remove_callback (GimpContainer *container,
GimpObject *object,
gpointer data)
{
GimpUndo *undo;
GimpUndo *stack;
undo = GIMP_UNDO (object);
stack = GIMP_UNDO (data);
stack->size -= undo->size;
}