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Viewing changes to app/display/gimpdisplayshell-autoscroll.c

  • Committer: Bazaar Package Importer
  • Author(s): Daniel Holbach
  • Date: 2007-05-02 16:33:03 UTC
  • mto: This revision was merged to the branch mainline in revision 12.
  • Revision ID: james.westby@ubuntu.com-20070502163303-6wchheivjxgjtlna
Tags: upstream-2.3.16
Import upstream version 2.3.16

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app/display/gimpdisplayshell-autoscroll.c
 
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/* GIMP - The GNU 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 <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 "gimpdisplayshell.h"
 
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#include "gimpdisplayshell-autoscroll.h"
 
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#include "gimpdisplayshell-coords.h"
 
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#include "gimpdisplayshell-scroll.h"
 
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#include "gimpdisplayshell-transform.h"
 
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#include "tools/tools-types.h"
 
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#include "tools/tool_manager.h"
 
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#include "tools/gimptool.h"
 
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#include "tools/gimptoolcontrol.h"
 
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#define AUTOSCROLL_DT  20
 
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#define AUTOSCROLL_DX  0.1
 
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typedef struct
 
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{
 
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  GdkEventMotion  *mevent;
 
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  GdkDevice       *device;
 
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  guint32          time;
 
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  GdkModifierType  state;
 
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  guint            timeout_id;
 
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} ScrollInfo;
 
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/*  local function prototypes  */
 
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static gboolean gimp_display_shell_autoscroll_timeout (gpointer data);
 
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/*  public functions  */
 
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void
 
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gimp_display_shell_autoscroll_start (GimpDisplayShell *shell,
 
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                                     GdkModifierType   state,
 
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                                     GdkEventMotion   *mevent)
 
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{
 
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  ScrollInfo *info;
 
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  g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
 
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  if (shell->scroll_info)
 
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    return;
 
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  info = g_new0 (ScrollInfo, 1);
 
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  info->mevent     = mevent;
 
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  info->device     = mevent->device;
 
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  info->time       = gdk_event_get_time ((GdkEvent *) mevent);
 
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  info->state      = state;
 
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  info->timeout_id = g_timeout_add (AUTOSCROLL_DT,
 
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                                    gimp_display_shell_autoscroll_timeout,
 
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                                    shell);
 
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  shell->scroll_info = info;
 
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}
 
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void
 
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gimp_display_shell_autoscroll_stop (GimpDisplayShell *shell)
 
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{
 
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  ScrollInfo *info;
 
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  g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
 
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  if (! shell->scroll_info)
 
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    return;
 
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  info = shell->scroll_info;
 
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  if (info->timeout_id)
 
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    {
 
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      g_source_remove (info->timeout_id);
 
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      info->timeout_id = 0;
 
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    }
 
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  g_free (info);
 
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  shell->scroll_info = NULL;
 
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}
 
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/*  private functions  */
 
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static gboolean
 
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gimp_display_shell_autoscroll_timeout (gpointer data)
 
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{
 
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  GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (data);
 
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  ScrollInfo       *info  = shell->scroll_info;
 
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  GimpCoords        device_coords;
 
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  GimpCoords        image_coords;
 
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  gint              dx = 0;
 
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  gint              dy = 0;
 
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  gimp_display_shell_get_device_coords (shell, info->device, &device_coords);
 
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  if (device_coords.x < 0)
 
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    dx = device_coords.x;
 
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  else if (device_coords.x > shell->disp_width)
 
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    dx = device_coords.x - shell->disp_width;
 
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  if (device_coords.y < 0)
 
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    dy = device_coords.y;
 
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  else if (device_coords.y > shell->disp_height)
 
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    dy = device_coords.y - shell->disp_height;
 
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  if (dx || dy)
 
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    {
 
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      GimpDisplay *display     = shell->display;
 
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      GimpTool    *active_tool = tool_manager_get_active (display->image->gimp);
 
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      info->time += AUTOSCROLL_DT;
 
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      gimp_display_shell_scroll (shell,
 
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                                 AUTOSCROLL_DX * (gdouble) dx,
 
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                                 AUTOSCROLL_DX * (gdouble) dy);
 
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      gimp_display_shell_untransform_coordinate (shell,
 
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                                                 &device_coords,
 
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                                                 &image_coords);
 
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      if (gimp_tool_control_get_snap_to (active_tool->control))
 
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        {
 
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          gint x, y, width, height;
 
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          gimp_tool_control_get_snap_offsets (active_tool->control,
 
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                                              &x, &y, &width, &height);
 
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          gimp_display_shell_snap_coords (shell,
 
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                                          &image_coords,
 
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                                          &image_coords,
 
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                                          x, y, width, height);
 
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        }
 
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      tool_manager_motion_active (display->image->gimp,
 
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                                  &image_coords,
 
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                                  info->time, info->state,
 
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                                  display);
 
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      return TRUE;
 
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    }
 
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  else
 
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    {
 
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      g_free (info);
 
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      shell->scroll_info = NULL;
 
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      return FALSE;
 
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    }
 
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}