mirror of https://github.com/GNOME/gimp.git
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <gtk/gtk.h>
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#include "display-types.h"
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#include "core/gimpimage.h"
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#include "gimpdisplay.h"
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#include "gimpdisplay-foreach.h"
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#include "gimpdisplayshell.h"
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#include "gimpdisplayshell-scale.h"
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#include "gimpdisplayshell-scroll.h"
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gboolean
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gimp_display_shell_scroll (GimpDisplayShell *shell,
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gint x_offset,
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gint y_offset)
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{
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gint old_x;
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gint old_y;
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g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), FALSE);
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old_x = shell->offset_x;
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old_y = shell->offset_y;
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shell->offset_x += x_offset;
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shell->offset_y += y_offset;
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gimp_display_shell_scroll_clamp_offsets (shell);
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/* the actual changes in offset */
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x_offset = (shell->offset_x - old_x);
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y_offset = (shell->offset_y - old_y);
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if (x_offset || y_offset)
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{
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/* reset the old values so that the tool can accurately redraw */
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shell->offset_x = old_x;
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shell->offset_y = old_y;
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gimp_display_shell_pause (shell);
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/* set the offsets back to the new values */
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shell->offset_x += x_offset;
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shell->offset_y += y_offset;
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gdk_window_scroll (shell->canvas->window, -x_offset, -y_offset);
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/* Make sure expose events are processed before scrolling again */
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gdk_window_process_updates (shell->canvas->window, FALSE);
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/* Update scrollbars and rulers */
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gimp_display_shell_scale_setup (shell);
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gimp_display_shell_resume (shell);
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gimp_display_shell_scrolled (shell);
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return TRUE;
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}
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return FALSE;
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}
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void
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gimp_display_shell_scroll_clamp_offsets (GimpDisplayShell *shell)
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{
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gint sx, sy;
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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sx = SCALEX (shell, shell->gdisp->gimage->width);
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sy = SCALEY (shell, shell->gdisp->gimage->height);
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shell->offset_x = CLAMP (shell->offset_x, 0,
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MAX (sx - shell->disp_width, 0));
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shell->offset_y = CLAMP (shell->offset_y, 0,
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MAX (sy - shell->disp_height, 0));
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}
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