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gimp/app/widgets/gimpundoeditor.c

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/* 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 <gtk/gtk.h>
#include "libgimpwidgets/gimpwidgets.h"
#include "widgets-types.h"
#include "core/gimp.h"
#include "core/gimplist.h"
#include "core/gimpimage.h"
#include "core/gimpimage-undo.h"
#include "core/gimpundostack.h"
#include "gimpcontainertreeview.h"
#include "gimpundoeditor.h"
#include "gimp-intl.h"
static void gimp_undo_editor_class_init (GimpUndoEditorClass *klass);
static void gimp_undo_editor_init (GimpUndoEditor *undo_editor);
static void gimp_undo_editor_set_image (GimpImageEditor *editor,
GimpImage *gimage);
static void gimp_undo_editor_undo_clicked (GtkWidget *widget,
GimpImageEditor *editor);
static void gimp_undo_editor_redo_clicked (GtkWidget *widget,
GimpImageEditor *editor);
static void gimp_undo_editor_undo_event (GimpImage *gimage,
GimpUndoEvent event,
GimpUndo *undo,
GimpUndoEditor *editor);
static void gimp_undo_editor_select_item (GimpContainerView *view,
GimpUndo *undo,
gpointer insert_data,
GimpUndoEditor *editor);
static GimpImageEditorClass *parent_class = NULL;
GType
gimp_undo_editor_get_type (void)
{
static GType editor_type = 0;
if (! editor_type)
{
static const GTypeInfo editor_info =
{
sizeof (GimpUndoEditorClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_undo_editor_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpUndoEditor),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_undo_editor_init,
};
editor_type = g_type_register_static (GIMP_TYPE_IMAGE_EDITOR,
"GimpUndoEditor",
&editor_info, 0);
}
return editor_type;
}
static void
gimp_undo_editor_class_init (GimpUndoEditorClass *klass)
{
GimpImageEditorClass *image_editor_class;
image_editor_class = GIMP_IMAGE_EDITOR_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
image_editor_class->set_image = gimp_undo_editor_set_image;
}
static void
gimp_undo_editor_init (GimpUndoEditor *undo_editor)
{
undo_editor->container = NULL;
undo_editor->view = gimp_container_tree_view_new (NULL, NULL,
GIMP_UNDO_PREVIEW_SIZE, 1,
FALSE);
gtk_container_add (GTK_CONTAINER (undo_editor), undo_editor->view);
gtk_widget_show (undo_editor->view);
g_signal_connect (undo_editor->view, "select_item",
G_CALLBACK (gimp_undo_editor_select_item),
undo_editor);
undo_editor->undo_button =
gimp_editor_add_button (GIMP_EDITOR (undo_editor),
GTK_STOCK_UNDO,
_("Undo"), NULL,
G_CALLBACK (gimp_undo_editor_undo_clicked),
NULL,
undo_editor);
undo_editor->redo_button =
gimp_editor_add_button (GIMP_EDITOR (undo_editor),
GTK_STOCK_REDO,
_("Redo"), NULL,
G_CALLBACK (gimp_undo_editor_redo_clicked),
NULL,
undo_editor);
}
static void
gimp_undo_editor_set_image (GimpImageEditor *image_editor,
GimpImage *gimage)
{
GimpUndoEditor *editor;
editor = GIMP_UNDO_EDITOR (image_editor);
if (image_editor->gimage)
{
gimp_container_view_set_container (GIMP_CONTAINER_VIEW (editor->view),
NULL);
g_object_unref (editor->container);
editor->container = NULL;
g_object_unref (editor->base_item);
editor->base_item = NULL;
g_signal_handlers_disconnect_by_func (image_editor->gimage,
gimp_undo_editor_undo_event,
editor);
}
GIMP_IMAGE_EDITOR_CLASS (parent_class)->set_image (image_editor, gimage);
if (gimage)
{
GimpUndo *top_undo_item;
GimpUndo *top_redo_item;
GList *list;
/* create a container as model for the undo history list */
editor->container = gimp_list_new (GIMP_TYPE_UNDO,
GIMP_CONTAINER_POLICY_STRONG);
editor->base_item = gimp_undo_new (gimage,
GIMP_UNDO_GROUP_NONE,
_("[ Base Image ]"),
NULL, 0, FALSE, NULL, NULL);
/* the list prepends its items, so first add the redo items... */
for (list = GIMP_LIST (gimage->redo_stack->undos)->list;
list;
list = g_list_next (list))
{
gimp_container_add (editor->container, GIMP_OBJECT (list->data));
}
/* ...reverse the list so the redo items are in ascending order... */
gimp_list_reverse (GIMP_LIST (editor->container));
/* ...then add the undo items in descending order... */
for (list = GIMP_LIST (gimage->undo_stack->undos)->list;
list;
list = g_list_next (list))
{
gimp_container_add (editor->container, GIMP_OBJECT (list->data));
}
/* ...finally, the first item is the special "base_item" which stands
* for the image with no more undos available to pop
*/
gimp_container_add (editor->container, GIMP_OBJECT (editor->base_item));
/* display the container */
gimp_container_view_set_container (GIMP_CONTAINER_VIEW (editor->view),
editor->container);
/* get the top item of both stacks */
top_undo_item = gimp_undo_stack_peek (gimage->undo_stack);
top_redo_item = gimp_undo_stack_peek (gimage->redo_stack);
gtk_widget_set_sensitive (editor->undo_button, top_undo_item != NULL);
gtk_widget_set_sensitive (editor->redo_button, top_redo_item != NULL);
g_signal_handlers_block_by_func (editor->view,
gimp_undo_editor_select_item,
editor);
/* select the current state of the image */
if (top_undo_item)
{
gimp_container_view_select_item (GIMP_CONTAINER_VIEW (editor->view),
GIMP_VIEWABLE (top_undo_item));
gimp_undo_create_preview (top_undo_item, FALSE);
}
else
{
gimp_container_view_select_item (GIMP_CONTAINER_VIEW (editor->view),
GIMP_VIEWABLE (editor->base_item));
gimp_undo_create_preview (editor->base_item, TRUE);
}
g_signal_handlers_unblock_by_func (editor->view,
gimp_undo_editor_select_item,
editor);
g_signal_connect (gimage, "undo_event",
G_CALLBACK (gimp_undo_editor_undo_event),
editor);
}
}
/* public functions */
GtkWidget *
gimp_undo_editor_new (GimpImage *gimage)
{
GimpUndoEditor *editor;
g_return_val_if_fail (! gimage || GIMP_IS_IMAGE (gimage), NULL);
editor = g_object_new (GIMP_TYPE_UNDO_EDITOR, NULL);
if (gimage)
gimp_image_editor_set_image (GIMP_IMAGE_EDITOR (editor), gimage);
return GTK_WIDGET (editor);
}
/* private functions */
static void
gimp_undo_editor_undo_clicked (GtkWidget *widget,
GimpImageEditor *editor)
{
if (editor->gimage)
{
if (gimp_image_undo (editor->gimage))
gimp_image_flush (editor->gimage);
}
}
static void
gimp_undo_editor_redo_clicked (GtkWidget *widget,
GimpImageEditor *editor)
{
if (editor->gimage)
{
if (gimp_image_redo (editor->gimage))
gimp_image_flush (editor->gimage);
}
}
static void
gimp_undo_editor_undo_event (GimpImage *gimage,
GimpUndoEvent event,
GimpUndo *undo,
GimpUndoEditor *editor)
{
GimpUndo *top_undo_item;
GimpUndo *top_redo_item;
top_undo_item = gimp_undo_stack_peek (gimage->undo_stack);
top_redo_item = gimp_undo_stack_peek (gimage->redo_stack);
g_signal_handlers_block_by_func (editor->view,
gimp_undo_editor_select_item,
editor);
switch (event)
{
case GIMP_UNDO_EVENT_UNDO_PUSHED:
gimp_container_insert (editor->container, GIMP_OBJECT (undo), -1);
gimp_container_view_select_item (GIMP_CONTAINER_VIEW (editor->view),
GIMP_VIEWABLE (undo));
gimp_undo_create_preview (undo, FALSE);
break;
case GIMP_UNDO_EVENT_UNDO_EXPIRED:
case GIMP_UNDO_EVENT_REDO_EXPIRED:
gimp_container_remove (editor->container, GIMP_OBJECT (undo));
break;
case GIMP_UNDO_EVENT_UNDO:
case GIMP_UNDO_EVENT_REDO:
if (top_undo_item)
{
gimp_container_view_select_item (GIMP_CONTAINER_VIEW (editor->view),
GIMP_VIEWABLE (top_undo_item));
gimp_undo_create_preview (top_undo_item, FALSE);
}
else
{
gimp_container_view_select_item (GIMP_CONTAINER_VIEW (editor->view),
GIMP_VIEWABLE (editor->base_item));
gimp_undo_create_preview (editor->base_item, TRUE);
}
break;
case GIMP_UNDO_EVENT_UNDO_FREE:
gimp_image_editor_set_image (GIMP_IMAGE_EDITOR (editor), NULL);
break;
}
g_signal_handlers_unblock_by_func (editor->view,
gimp_undo_editor_select_item,
editor);
gtk_widget_set_sensitive (editor->undo_button, top_undo_item != NULL);
gtk_widget_set_sensitive (editor->redo_button, top_redo_item != NULL);
}
static void
gimp_undo_editor_select_item (GimpContainerView *view,
GimpUndo *undo,
gpointer insert_data,
GimpUndoEditor *editor)
{
GimpImage *gimage;
GimpUndo *top_undo_item;
GimpUndo *top_redo_item;
if (! undo)
return;
gimage = GIMP_IMAGE_EDITOR (editor)->gimage;
top_undo_item = gimp_undo_stack_peek (gimage->undo_stack);
if (undo == editor->base_item)
{
/* the base_item was selected, pop all available undo items
*/
while (top_undo_item != NULL)
{
gimp_image_undo (gimage);
top_undo_item = gimp_undo_stack_peek (gimage->undo_stack);
}
}
else if (gimp_container_have (gimage->undo_stack->undos, GIMP_OBJECT (undo)))
{
/* the selected item is on the undo stack, pop undos until it
* is on top of the undo stack
*/
while (top_undo_item != undo)
{
gimp_image_undo (gimage);
top_undo_item = gimp_undo_stack_peek (gimage->undo_stack);
}
}
else if (gimp_container_have (gimage->redo_stack->undos, GIMP_OBJECT (undo)))
{
/* the selected item is on the redo stack, pop redos until it
* is on top of the undo stack
*/
while (top_undo_item != undo)
{
gimp_image_redo (gimage);
top_undo_item = gimp_undo_stack_peek (gimage->undo_stack);
}
}
gimp_image_flush (gimage);
top_redo_item = gimp_undo_stack_peek (gimage->redo_stack);
gtk_widget_set_sensitive (editor->undo_button, top_undo_item != NULL);
gtk_widget_set_sensitive (editor->redo_button, top_redo_item != NULL);
}
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