src/apps/mediaplayer/support/CommandStack.h

   1 /*
   2  * Copyright 2006-2007, Haiku.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Authors:
   6  *              Stephan Aßmus <superstippi@gmx.de>
   7  */
   8 #ifndef COMMAND_STACK_H
   9 #define COMMAND_STACK_H
  10
  11 #include <stack>
  12
  13 #include "Notifier.h"
  14
  15 class BString;
  16 class RWLocker;
  17 class Command;
  18
  19 class CommandStack : public Notifier {
  20  public:
  21                                                                 CommandStack(RWLocker* locker);
  22         virtual                                         ~CommandStack();
  23
  24                         status_t                        Perform(Command* command);
  25
  26                         status_t                        Undo();
  27                         status_t                        Redo();
  28
  29                         bool                            GetUndoName(BString& name);
  30                         bool                            GetRedoName(BString& name);
  31
  32                         void                            Clear();
  33                         void                            Save();
  34                         bool                            IsSaved();
  35
  36  private:
  37                         status_t                        _AddCommand(Command* command);
  38
  39                         RWLocker*                       fLocker;
  40
  41         typedef std::stack<Command*> command_stack;
  42
  43                         command_stack           fUndoHistory;
  44                         command_stack           fRedoHistory;
  45                         Command*                        fSavedCommand;
  46 };
  47
  48 #endif // COMMAND_STACK_H