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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 <stdlib.h>
#include <gtk/gtk.h>
#include "display-types.h"
#include "core/gimpimage.h"
#include "gimpdisplay.h"
#include "gimpdisplay-foreach.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-scale.h"
#include "gimpdisplayshell-scroll.h"
gboolean
gimp_display_shell_scroll (GimpDisplayShell *shell,
gint x_offset,
gint y_offset)
{
gint old_x;
gint old_y;
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), FALSE);
old_x = shell->offset_x;
old_y = shell->offset_y;
shell->offset_x += x_offset;
shell->offset_y += y_offset;
gimp_display_shell_scroll_clamp_offsets (shell);
/* the actual changes in offset */
x_offset = (shell->offset_x - old_x);
y_offset = (shell->offset_y - old_y);
if (x_offset || y_offset)
{
/* reset the old values so that the tool can accurately redraw */
shell->offset_x = old_x;
shell->offset_y = old_y;
gimp_display_shell_pause (shell);
/* set the offsets back to the new values */
shell->offset_x += x_offset;
shell->offset_y += y_offset;
gdk_window_scroll (shell->canvas->window, -x_offset, -y_offset);
/* Make sure expose events are processed before scrolling again */
gdk_window_process_updates (shell->canvas->window, FALSE);
/* Update scrollbars and rulers */
gimp_display_shell_scale_setup (shell);
gimp_display_shell_resume (shell);
gimp_display_shell_scrolled (shell);
return TRUE;
}
return FALSE;
}
void
gimp_display_shell_scroll_clamp_offsets (GimpDisplayShell *shell)
{
gint sx, sy;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
sx = SCALEX (shell, shell->gdisp->gimage->width);
sy = SCALEY (shell, shell->gdisp->gimage->height);
shell->offset_x = CLAMP (shell->offset_x, 0,
MAX (sx - shell->disp_width, 0));
shell->offset_y = CLAMP (shell->offset_y, 0,
MAX (sy - shell->disp_height, 0));
}
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