cinelerra/undostackitem.h

   1 #ifndef UNDOSTACKITEM_H
   2 #define UNDOSTACKITEM_H
   3
   4 #include "linklist.h"
   5
   6
   7 class UndoStackItem : public ListItem<UndoStackItem>
   8 {
   9 public:
  10         UndoStackItem();
  11         virtual ~UndoStackItem();
  12
  13         void set_description(char *description);
  14         void set_creator(void *creator);
  15
  16 // This function must be overridden in derived objects.
  17 // It is called both to undo and to redo an operation.
  18 // The override must do the following:
  19 // - change the EDL to undo an operation;
  20 // - change the internal information of the item so that the next invocation
  21 //   of undo() does a redo (i.e. undoes the undone operation).
  22         virtual void undo();
  23
  24 // Return the amount of memory used for the data associated with this
  25 // object in order to enable limiting the amount of memory used by the
  26 // undo stack.
  27 // Ignore overhead and just report the specific data values that the
  28 // derived object adds.
  29         virtual int get_size();
  30
  31
  32 // command description for the menu item
  33         char *description;
  34 // who created this item
  35         void* creator;
  36 };
  37
  38 #endif