cinelerra/undostack.h

   1 #ifndef UNDOSTACK_H
   2 #define UNDOSTACK_H
   3
   4 #include "linklist.h"
   5
   6 // Minimum number of undoable operations on the undo stack
   7 #define UNDOMINLEVELS 5
   8 // Limits the bytes of memory used by the undo stack
   9 #define UNDOMEMORY 50000000
  10
  11 class UndoStackItem;
  12
  13
  14 class UndoStack : public List<UndoStackItem>
  15 {
  16 public:
  17         UndoStack();
  18         ~UndoStack();
  19
  20 // delete future undos if in the middle
  21 // delete undos older than UNDOLEVELS if last
  22    void push(UndoStackItem *item);
  23
  24 // move to the previous undo entry
  25         int pull();
  26
  27
  28 // move to the next undo entry for a redo
  29         UndoStackItem* pull_next();
  30
  31         UndoStackItem* current;
  32
  33         void prune();
  34 };
  35
  36 #endif