app/undo.h

   1 /* Dia -- an diagram creation/manipulation program
   2  * Copyright (C) 1999 Alexander Larsson
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18 #ifndef UNDO_H
  19 #define UNDO_H
  20
  21
  22 typedef struct _UndoStack UndoStack;
  23 typedef struct _Change Change;
  24
  25 #include "diagram.h"
  26 #include "objchange.h"
  27
  28 typedef void (*UndoApplyFunc)(Change *change, Diagram *dia);
  29 typedef void (*UndoRevertFunc)(Change *change, Diagram *dia);
  30 typedef void (*UndoFreeFunc)(Change *change);
  31
  32 struct _Change {
  33   /* If apply == transaction_point_pointer then this is a transaction
  34      point */
  35   UndoApplyFunc  apply;
  36   UndoRevertFunc revert;
  37   UndoFreeFunc   free; /* Remove extra data. Then this object is freed */
  38   Change *prev, *next;
  39 };
  40
  41 struct _UndoStack {
  42   Diagram *dia;
  43   Change *last_change; /* Points to the object on the top of stack. */
  44   Change *current_change; /* Points to the last object currently applied */
  45   int depth;
  46 };
  47
  48 UndoStack *new_undo_stack(Diagram *dia);
  49 void undo_destroy(UndoStack *stack);
  50 void undo_push_change(UndoStack *stack, Change *change);
  51 void undo_set_transactionpoint(UndoStack *stack);
  52 void undo_revert_to_last_tp(UndoStack *stack);
  53 void undo_apply_to_next_tp(UndoStack *stack);
  54 void undo_clear(UndoStack *stack);
  55
  56 /* Specific undo functions: */
  57
  58 Change *undo_move_objects(Diagram *dia, Point *orig_pos,
  59                           Point *dest_pos, GList *obj_list);
  60 Change *undo_move_handle(Diagram *dia,
  61                          Handle *handle, Object *obj,
  62                          Point orig_pos, Point dest_pos);
  63 Change *undo_connect(Diagram *dia, Object *obj, Handle *handle,
  64                      ConnectionPoint *connectionpoint);
  65 Change *undo_unconnect(Diagram *dia, Object *obj, Handle *handle);
  66 Change *undo_delete_objects(Diagram *dia, GList *obj_list); /* Reads current obj list */
  67 Change *undo_insert_objects(Diagram *dia, GList *obj_list,
  68                             int applied);
  69 Change *undo_reorder_objects(Diagram *dia, GList *changed_list,
  70                              GList *orig_list); /* Reads current obj list */
  71 Change *undo_object_change(Diagram *dia, Object *obj,
  72                            ObjectChange *obj_change);
  73 Change *undo_group_objects(Diagram *dia, GList *obj_list,
  74                            Object *group, GList *orig_list);
  75 Change *undo_ungroup_objects(Diagram *dia, GList *obj_list,
  76                              Object *group, int group_index);
  77
  78 #endif /* UNDO_H */
  79