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gimp/app/undo_history.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995-1999 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.
*
* Undo history browser by Austin Donnelly <austin@gimp.org>
*/
/* TODO:
*
* - reuse the L&C previews?
* Currently we use gimp_image_construct_composite_preview ()
* which makes use of the preview_cache on a per layer basis.
*
* - work out which (if any) is the clean image, and mark it as such.
* Currently, it's on the wrong line.
*
* - undo names are less than useful. This isn't a problem with
* undo_history.c itself, more with the rather chaotic way
* people have of picking an undo type when pushing undos, and
* inconsistent use of undo groups. Maybe rather than
* specifying an (enum) type, it should be a const char * ?
*
* BUGS:
* - clean pixmap in wrong place
*
* Initial rev 0.01, (c) 19 Sept 1999 Austin Donnelly <austin@gimp.org>
*
*/
#include <gtk/gtk.h>
#include "gimprc.h"
#include "gimpui.h"
#include "temp_buf.h"
#include "undo.h"
#include "gimage_mask.h"
#include "dialog_handler.h"
#include "config.h"
#include "libgimp/gimpintl.h"
#include "libgimp/gimplimits.h"
#include "pixmaps/raise.xpm"
#include "pixmaps/lower.xpm"
#include "pixmaps/yes.xpm"
#include "pixmaps/question.xpm"
typedef struct
{
GImage *gimage; /* image we're tracking undo info for */
GtkWidget *shell; /* dialog window */
GtkWidget *clist; /* list of undo actions */
GtkWidget *undo_button; /* button to undo an operation */
GtkWidget *redo_button; /* button to redo an operation */
int old_selection; /* previous selection in the clist */
int preview_size; /* size of the previews (from preferences) */
} undo_history_st;
typedef struct
{
GtkCList *clist;
gint row;
gint size;
GImage *gimage;
} idle_preview_args;
/*
* Theory of operation.
*
* Keep a clist. Each row of the clist corresponds to an image as it
* was at some time in the past, present or future. The selected row
* is the present image. Rows below the selected one are in the
* future - as redo operations are performed, they become the current
* image. Rows above the selected one are in the past - undo
* operations move the highlight up.
*
* The slight fly in the ointment is that if rows are images, then how
* should they be labelled? An undo or redo operation goes _between_
* two image states - it isn't an image state. It's a pretty
* arbitrary decision, but I've chosen to label a row with the name of
* the action that brought the image into the state represented by
* that row. Thus, there is a special first row without a meaningful
* label, which represents the image state before the first action has
* been done to it. The choice is between a special first row or a
* special last row. Since people mostly work near the leading edge,
* not often going all the way back, I've chosen to put the special
* case out of common sight.
*
* So, the undo stack contents appear above the selected row, and the
* redo stack below it.
*
* The clist is initialised by mapping over the undo and redo stack.
*
* Once initialised, the dialog listens to undo_event signals from the
* gimage. These undo events allow us to track changes to the undo
* and redo stacks. We follow the events, making parallel changes to
* the clist. If we ever get out of sync, there is no mechanism to
* notice or re-sync. A few g_return_if_fails should catch some of
* these cases.
*
* User clicks changing the selected row in the clist turn into
* multiple calls to undo_pop or undo_redo, with appropriate signals
* blocked so we don't get our own events back.
*
* The "Close" button hides the dialog, rather than destroying it.
* This may well need to be changed, since the dialog will continue to
* track updates, and if it's generating previews this might take too
* long for large images.
*
* The dialog is destroyed when the gimage it is tracking is
* destroyed. Note that a File/Revert destroys the current gimage and
* so blows the undo/redo stacks.
*
* --austin, 19/9/1999
*/
/**************************************************************/
/* Static Data */
static GdkPixmap *clean_pixmap = NULL;
static GdkBitmap *clean_mask = NULL;
static GdkPixmap *clear_pixmap = NULL;
static GdkBitmap *clear_mask = NULL;
/**************************************************************/
/* Local functions */
static MaskBuf *
mask_render_preview (GImage *gimage,
gint *pwidth,
gint *pheight)
{
Channel * mask;
MaskBuf * scaled_buf = NULL;
PixelRegion srcPR, destPR;
int subsample;
int width, height;
int scale;
mask = gimage_get_mask (gimage);
if ((drawable_width (GIMP_DRAWABLE(mask)) > *pwidth) ||
(drawable_height (GIMP_DRAWABLE(mask)) > *pheight))
{
if (((float) drawable_width (GIMP_DRAWABLE (mask)) / (float) *pwidth) >
((float) drawable_height (GIMP_DRAWABLE (mask)) / (float) *pheight))
{
width = *pwidth;
height = (drawable_height (GIMP_DRAWABLE (mask)) * (*pwidth)) / drawable_width (GIMP_DRAWABLE (mask));
}
else
{
width = (drawable_width (GIMP_DRAWABLE (mask)) * (*pheight)) / drawable_height (GIMP_DRAWABLE (mask));
height = *pheight;
}
scale = TRUE;
}
else
{
width = drawable_width (GIMP_DRAWABLE (mask));
height = drawable_height (GIMP_DRAWABLE (mask));
scale = FALSE;
}
/* if the mask is empty, no need to scale and update again */
if (gimage_mask_is_empty (gimage))
return NULL;
if (scale)
{
/* calculate 'acceptable' subsample */
subsample = 1;
while ((width * (subsample + 1) * 2 < drawable_width (GIMP_DRAWABLE (mask))) &&
(height * (subsample + 1) * 2 < drawable_height (GIMP_DRAWABLE (mask))))
subsample = subsample + 1;
pixel_region_init (&srcPR, drawable_data (GIMP_DRAWABLE (mask)),
0, 0,
drawable_width (GIMP_DRAWABLE (mask)),
drawable_height (GIMP_DRAWABLE (mask)), FALSE);
scaled_buf = mask_buf_new (width, height);
destPR.bytes = 1;
destPR.x = 0;
destPR.y = 0;
destPR.w = width;
destPR.h = height;
destPR.rowstride = srcPR.bytes * width;
destPR.data = mask_buf_data (scaled_buf);
destPR.tiles = NULL;
subsample_region (&srcPR, &destPR, subsample);
}
else
{
pixel_region_init (&srcPR, drawable_data (GIMP_DRAWABLE (mask)),
0, 0,
drawable_width (GIMP_DRAWABLE (mask)),
drawable_height (GIMP_DRAWABLE (mask)), FALSE);
scaled_buf = mask_buf_new (width, height);
destPR.bytes = 1;
destPR.x = 0;
destPR.y = 0;
destPR.w = width;
destPR.h = height;
destPR.rowstride = srcPR.bytes * width;
destPR.data = mask_buf_data (scaled_buf);
destPR.tiles = NULL;
copy_region (&srcPR, &destPR);
}
*pheight = height;
*pwidth = width;
return scaled_buf;
}
static gint
undo_history_set_pixmap_idle (gpointer data)
{
idle_preview_args *idle = data;
static GdkGC *gc = NULL;
TempBuf *buf = NULL;
GdkPixmap *pixmap;
UndoType utype;
MaskBuf *mbuf = NULL;
guchar *src;
gdouble r, g, b, a;
gdouble c0, c1;
guchar *p0, *p1, *even, *odd;
gint width, height, bpp;
gint x, y;
if (!gc)
gc = gdk_gc_new (GTK_WIDGET (idle->clist)->window);
width = idle->gimage->width;
height = idle->gimage->height;
/* Get right aspect ratio */
if (width > height)
{
height = (gint)(((gdouble)idle->size * (gdouble)height) / (gdouble)width + 0.5);
width = (gint)(((gdouble)width * (gdouble)height)/ (gdouble)idle->gimage->height + 0.5);
}
else
{
width = (gint)(((gdouble)idle->size * (gdouble)width) / (gdouble)height + 0.5);
height = (gint)(((gdouble)height * (gdouble)width ) /(gdouble) idle->gimage->width + 0.5);
}
utype = undo_get_undo_top_type (idle->gimage);
if((utype != MASK_UNDO && utype != QMASK_UNDO) ||
(mbuf = mask_render_preview (idle->gimage,&width,&height)) == NULL)
{
buf = gimp_image_construct_composite_preview (idle->gimage, width, height);
bpp = buf->bytes;
src = temp_buf_data (buf);
}
else
{
src = mask_buf_data (mbuf);
bpp = 1; /* Always the case for masks */
}
pixmap = gdk_pixmap_new (GTK_WIDGET (idle->clist)->window, width+2, height+2, -1);
gdk_draw_rectangle (pixmap,
GTK_WIDGET (idle->clist)->style->black_gc,
TRUE,
0, 0,
width + 2, height + 2);
even = g_malloc (width * 3);
odd = g_malloc (width * 3);
for (y = 0; y < height; y++)
{
p0 = even;
p1 = odd;
for (x = 0; x < width; x++)
{
if (bpp == 4)
{
r = ((gdouble) src[x*4+0]) / 255.0;
g = ((gdouble) src[x*4+1]) / 255.0;
b = ((gdouble) src[x*4+2]) / 255.0;
a = ((gdouble) src[x*4+3]) / 255.0;
}
else if (bpp == 3)
{
r = ((gdouble) src[x*3+0]) / 255.0;
g = ((gdouble) src[x*3+1]) / 255.0;
b = ((gdouble) src[x*3+2]) / 255.0;
a = 1.0;
}
else
{
r = ((gdouble) src[x*bpp+0]) / 255.0;
g = b = r;
if (bpp == 2)
a = ((gdouble) src[x*bpp+1]) / 255.0;
else
a = 1.0;
}
if ((x / GIMP_CHECK_SIZE_SM) & 1)
{
c0 = GIMP_CHECK_LIGHT;
c1 = GIMP_CHECK_DARK;
}
else
{
c0 = GIMP_CHECK_DARK;
c1 = GIMP_CHECK_LIGHT;
}
*p0++ = (c0 + (r - c0) * a) * 255.0;
*p0++ = (c0 + (g - c0) * a) * 255.0;
*p0++ = (c0 + (b - c0) * a) * 255.0;
*p1++ = (c1 + (r - c1) * a) * 255.0;
*p1++ = (c1 + (g - c1) * a) * 255.0;
*p1++ = (c1 + (b - c1) * a) * 255.0;
}
if ((y / GIMP_CHECK_SIZE_SM) & 1)
{
gdk_draw_rgb_image (pixmap, gc,
1, y + 1,
width, 1,
GDK_RGB_DITHER_NORMAL,
(guchar *) odd, 3);
}
else
{
gdk_draw_rgb_image (pixmap, gc,
1, y + 1,
width, 1,
GDK_RGB_DITHER_NORMAL,
(guchar *) even, 3);
}
src += width * bpp;
}
g_free (even);
g_free (odd);
if(buf)
temp_buf_free (buf);
if(mbuf)
mask_buf_free (mbuf);
gtk_clist_set_row_data (idle->clist, idle->row, (gpointer)2);
gtk_clist_set_pixmap (idle->clist, idle->row, 0, pixmap, NULL);
gdk_pixmap_unref (pixmap);
return (FALSE);
}
/* check if a preview is already made, otherwise gtk_idle_add the pixmap func */
static void
undo_history_set_pixmap (GtkCList *clist,
gint row,
gint size,
GImage *gimage)
{
static idle_preview_args idle;
if (!size || ((gint)gtk_clist_get_row_data (clist, row)) == 2)
return;
idle.clist = clist;
idle.row = row;
idle.size = size;
idle.gimage = gimage;
gtk_idle_add ((GtkFunction)undo_history_set_pixmap_idle, &idle);
}
/* close button clicked */
static void
undo_history_close_callback (GtkWidget *widget,
gpointer data)
{
undo_history_st *st = data;
gtk_widget_hide (GTK_WIDGET (st->shell));
}
/* The gimage and shell destroy callbacks are split so we can:
* a) blow the shell when the image dissappears
* b) disconnect from the image if the shell dissappears (we don't
* want signals from the image to carry on using "st" once it's
* been freed.
*/
/* gimage renamed */
static void
undo_history_gimage_rename_callback (GimpImage *gimage,
gpointer data)
{
undo_history_st *st = data;
gchar *title;
title = g_strdup_printf (_("Undo History: %s"),
g_basename (gimage_filename (gimage)));
gtk_window_set_title (GTK_WINDOW (st->shell), title);
g_free (title);
}
/* gimage destroyed */
static void
undo_history_gimage_destroy_callback (GimpImage *gimage,
gpointer data)
{
undo_history_st *st = data;
st->gimage = NULL; /* not allowed to use this any more */
dialog_unregister (st->shell);
gtk_widget_destroy (GTK_WIDGET (st->shell));
/* which continues in the function below: */
}
static void
undo_history_shell_destroy_callback (GtkWidget *widget,
gpointer data)
{
undo_history_st *st = data;
if (st->gimage)
gtk_signal_disconnect_by_data (GTK_OBJECT (st->gimage), st);
g_free (st);
}
/* undo button clicked */
static void
undo_history_undo_callback (GtkWidget *widget,
gpointer data)
{
undo_history_st *st = data;
undo_pop (st->gimage);
}
/* redo button clicked */
static void
undo_history_redo_callback (GtkWidget *widget,
gpointer data)
{
undo_history_st *st = data;
undo_redo (st->gimage);
}
/* Always start clist with dummy entry for image state before
* the first action on the undo stack */
static void
undo_history_prepend_special (GtkCList *clist)
{
gchar *name = _("[ base image ]");
gchar *namelist[3];
gint row;
namelist[0] = NULL;
namelist[1] = NULL;
namelist[2] = name;
row = gtk_clist_prepend (clist, namelist);
}
/* Recalculate which of the undo and redo buttons are meant to be sensitive */
static void
undo_history_set_sensitive (undo_history_st *st,
int rows)
{
gtk_widget_set_sensitive (st->undo_button, (st->old_selection != 0));
gtk_widget_set_sensitive (st->redo_button, (st->old_selection != rows-1));
}
/* Track undo_event signals, telling us of changes to the undo and
* redo stacks. */
static void
undo_history_undo_event (GtkWidget *widget,
int ev,
gpointer data)
{
undo_history_st *st = data;
undo_event_t event = ev;
const char *name;
char *namelist[3];
GList *list;
int cur_selection;
GtkCList *clist;
gint row;
GdkPixmap *pixmap;
GdkBitmap *mask;
list = GTK_CLIST (st->clist)->selection;
g_return_if_fail (list != NULL);
cur_selection = GPOINTER_TO_INT (list->data);
clist = GTK_CLIST (st->clist);
/* block select events */
gtk_signal_handler_block_by_data (GTK_OBJECT (st->clist), st);
switch (event)
{
case UNDO_PUSHED:
/* clip everything after the current selection (ie, the
* actions that are from the redo stack) */
gtk_clist_freeze (clist);
while (clist->rows > cur_selection + 1)
gtk_clist_remove (clist, cur_selection + 1);
/* find out what's new */
name = undo_get_undo_name (st->gimage);
namelist[0] = NULL;
namelist[1] = NULL;
namelist[2] = (char *) name;
row = gtk_clist_append (clist, namelist);
g_assert (clist->rows == cur_selection+2);
undo_history_set_pixmap (clist, row, st->preview_size, st->gimage);
/* always force selection to bottom, and scroll to it */
gtk_clist_select_row (clist, clist->rows - 1, -1);
gtk_clist_thaw (clist);
gtk_clist_moveto (clist, clist->rows - 1, 0, 1.0, 0.0);
cur_selection = clist->rows-1;
break;
case UNDO_EXPIRED:
/* remove earliest row, but not our special first one */
if (gtk_clist_get_pixmap (clist, 1, 0, &pixmap, &mask))
gtk_clist_set_pixmap (clist, 0, 0, pixmap, mask);
gtk_clist_remove (clist, 1);
break;
case UNDO_POPPED:
/* move hilight up one */
g_return_if_fail (cur_selection >= 1);
gtk_clist_select_row (clist, cur_selection - 1, -1);
cur_selection--;
undo_history_set_pixmap (clist, cur_selection, st->preview_size, st->gimage);
if ( !(gtk_clist_row_is_visible (clist, cur_selection) & GTK_VISIBILITY_FULL))
gtk_clist_moveto (clist, cur_selection, 0, 0.0, 0.0);
break;
case UNDO_REDO:
/* move hilight down one */
g_return_if_fail (cur_selection+1 < clist->rows);
gtk_clist_select_row (clist, cur_selection+1, -1);
cur_selection++;
undo_history_set_pixmap (clist, cur_selection, st->preview_size, st->gimage);
if ( !(gtk_clist_row_is_visible (clist, cur_selection) & GTK_VISIBILITY_FULL))
gtk_clist_moveto (clist, cur_selection, 0, 1.0, 0.0);
break;
case UNDO_FREE:
/* clear all info other that the special first line */
gtk_clist_freeze (clist);
gtk_clist_clear (clist);
undo_history_prepend_special (clist);
gtk_clist_thaw (clist);
cur_selection = 0;
break;
}
gtk_signal_handler_unblock_by_data (GTK_OBJECT (st->clist), st);
st->old_selection = cur_selection;
undo_history_set_sensitive (st, clist->rows);
}
static void
undo_history_select_row_callback (GtkWidget *widget,
gint row,
gint column,
gpointer event,
gpointer data)
{
undo_history_st *st = data;
int cur_selection;
cur_selection = row;
if (cur_selection == st->old_selection)
return;
/* Disable undo_event signals while we do these multiple undo or
* redo actions. */
gtk_signal_handler_block_by_func (GTK_OBJECT (st->gimage),
undo_history_undo_event, st);
while (cur_selection < st->old_selection)
{
undo_pop (st->gimage);
st->old_selection--;
}
while (cur_selection > st->old_selection)
{
undo_redo (st->gimage);
st->old_selection++;
}
undo_history_set_pixmap (GTK_CLIST (widget), cur_selection, st->preview_size, st->gimage);
gtk_signal_handler_unblock_by_func (GTK_OBJECT (st->gimage),
undo_history_undo_event, st);
undo_history_set_sensitive (st, GTK_CLIST(st->clist)->rows);
}
static void
undo_history_clean_callback (GtkWidget *widget,
gpointer data)
{
undo_history_st *st = data;
int i;
int nrows;
GtkCList *clist;
if (st->gimage->dirty != 0)
return;
/* The image is clean, so this is the version on disc. Remove the
* clean star from all other entries, and add it to the current
* one. */
/* XXX currently broken, since "clean" signal is emitted before
* UNDO_POPPED event. I don't want to change the order of the
* signals. So I'm a little stuck. --austin */
clist = GTK_CLIST (st->clist);
nrows = clist->rows;
gtk_clist_freeze (clist);
for (i=0; i < nrows; i++)
gtk_clist_set_text (clist, i, 1, NULL);
gtk_clist_set_pixmap (clist, st->old_selection, 1,
clean_pixmap, clean_mask);
gtk_clist_thaw (clist);
}
/* Used to build up initial contents of clist */
static int
undo_history_init_undo (const char *undoitemname,
void *data)
{
undo_history_st *st = data;
char *namelist[3];
gint row;
namelist[0] = NULL;
namelist[1] = NULL;
namelist[2] = (char *) undoitemname;
row = gtk_clist_prepend (GTK_CLIST (st->clist), namelist);
gtk_clist_set_pixmap (GTK_CLIST (st->clist), row, 0,
clear_pixmap, clear_mask);
return 0;
}
/* Ditto */
static int
undo_history_init_redo (const char *undoitemname,
void *data)
{
undo_history_st *st = data;
char *namelist[3];
gint row;
namelist[0] = NULL; namelist[1] = NULL;
namelist[2] = (char *) undoitemname;
row = gtk_clist_append (GTK_CLIST (st->clist), namelist);
gtk_clist_set_pixmap (GTK_CLIST (st->clist), row, 0,
clear_pixmap, clear_mask);
return 0;
}
/*************************************************************/
/* Publicly exported function */
GtkWidget *
undo_history_new (GImage *gimage)
{
undo_history_st *st;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *button;
GtkWidget *scrolled_win;
st = g_new0 (undo_history_st, 1);
st->gimage = gimage;
st->preview_size = preview_size;
/* gimage signals */
gtk_signal_connect (GTK_OBJECT (gimage), "undo_event",
GTK_SIGNAL_FUNC (undo_history_undo_event),
st);
gtk_signal_connect (GTK_OBJECT (gimage), "rename",
GTK_SIGNAL_FUNC (undo_history_gimage_rename_callback),
st);
gtk_signal_connect (GTK_OBJECT (gimage), "destroy",
GTK_SIGNAL_FUNC (undo_history_gimage_destroy_callback),
st);
gtk_signal_connect (GTK_OBJECT (gimage), "clean",
GTK_SIGNAL_FUNC (undo_history_clean_callback),
st);
/* The shell and main vbox */
{
gchar *title = g_strdup_printf (_("Undo History: %s"),
g_basename (gimage_filename (gimage)));
st->shell = gimp_dialog_new (title, "undo_history",
gimp_standard_help_func,
"dialogs/undo_history.html",
GTK_WIN_POS_NONE,
FALSE, TRUE, FALSE,
_("Close"), undo_history_close_callback,
st, NULL, NULL, TRUE, TRUE,
NULL);
dialog_register (st->shell);
g_free (title);
}
vbox = gtk_vbox_new (FALSE, 2);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 2);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (st->shell)->vbox), vbox);
gtk_widget_show (vbox);
gtk_signal_connect (GTK_OBJECT (st->shell), "destroy",
GTK_SIGNAL_FUNC (undo_history_shell_destroy_callback),
st);
scrolled_win = gtk_scrolled_window_new (NULL, NULL);
gtk_widget_set_usize (GTK_WIDGET (scrolled_win),
160 + st->preview_size,
4 * (MAX (st->preview_size, 16) + 6));
/* clist of undo actions */
st->clist = gtk_clist_new (3);
gtk_clist_set_selection_mode (GTK_CLIST (st->clist), GTK_SELECTION_BROWSE);
gtk_clist_set_reorderable (GTK_CLIST (st->clist), FALSE);
gtk_clist_set_row_height (GTK_CLIST (st->clist), MAX (st->preview_size, 16) + 4);
gtk_clist_set_column_width (GTK_CLIST (st->clist), 0, st->preview_size + 2);
gtk_clist_set_column_width (GTK_CLIST (st->clist), 1, 18);
gtk_clist_set_column_min_width (GTK_CLIST (st->clist), 2, 64);
/* allocate the pixmaps if not already done */
if (!clean_pixmap)
{
GtkStyle *style;
gtk_widget_realize (st->shell);
style = gtk_widget_get_style (st->shell);
clean_pixmap =
gdk_pixmap_create_from_xpm_d (st->shell->window,
&clean_mask,
&style->bg[GTK_STATE_NORMAL],
yes_xpm);
clear_pixmap =
gdk_pixmap_create_from_xpm_d (st->shell->window,
&clear_mask,
&style->bg[GTK_STATE_NORMAL],
question_xpm);
}
/* work out the initial contents */
undo_map_over_undo_stack (st->gimage, undo_history_init_undo, st);
/* force selection to bottom */
gtk_clist_select_row (GTK_CLIST (st->clist),
GTK_CLIST (st->clist)->rows - 1, -1);
undo_map_over_redo_stack (st->gimage, undo_history_init_redo, st);
undo_history_prepend_special (GTK_CLIST (st->clist));
st->old_selection = GPOINTER_TO_INT(GTK_CLIST(st->clist)->selection->data);
/* draw the preview of the current state */
undo_history_set_pixmap (GTK_CLIST (st->clist),
st->old_selection, st->preview_size, st->gimage);
gtk_signal_connect (GTK_OBJECT (st->clist), "select_row",
GTK_SIGNAL_FUNC (undo_history_select_row_callback),
st);
gtk_widget_show (GTK_WIDGET (st->clist));
gtk_box_pack_start (GTK_BOX (vbox), scrolled_win, TRUE, TRUE, 0);
gtk_widget_show (GTK_WIDGET (scrolled_win));
gtk_container_add (GTK_CONTAINER (scrolled_win), st->clist);
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_win),
GTK_POLICY_NEVER,
GTK_POLICY_ALWAYS);
hbox = gtk_hbox_new (FALSE, 6);
gtk_container_set_border_width (GTK_CONTAINER (hbox), 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
st->undo_button = button = gimp_pixmap_button_new (raise_xpm, _("Undo"));
gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
gtk_signal_connect (GTK_OBJECT (button), "clicked",
GTK_SIGNAL_FUNC (undo_history_undo_callback),
st);
gtk_widget_show (GTK_WIDGET (button));
st->redo_button = button = gimp_pixmap_button_new (lower_xpm, _("Redo"));
gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
gtk_signal_connect (GTK_OBJECT (button), "clicked",
GTK_SIGNAL_FUNC (undo_history_redo_callback),
st);
gtk_widget_show (GTK_WIDGET (button));
undo_history_set_sensitive (st, GTK_CLIST (st->clist)->rows);
gtk_widget_show (GTK_WIDGET (st->shell));
gtk_clist_moveto (GTK_CLIST (st->clist), st->old_selection, 0, 0.5, 0.0);
return st->shell;
}
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