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undostackitem.h

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00001 #ifndef UNDOSTACKITEM_H
00002 #define UNDOSTACKITEM_H
00003 
00004 #include "linklist.h"
00005 
00006 
00007 class UndoStackItem : public ListItem<UndoStackItem>
00008 {
00009 public:
00010         UndoStackItem();
00011         virtual ~UndoStackItem();
00012 
00013         void set_description(char *description);
00014         void set_creator(void *creator);
00015 
00016 // This function must be overridden in derived objects.
00017 // It is called both to undo and to redo an operation.
00018 // The override must do the following:
00019 // - change the EDL to undo an operation;
00020 // - change the internal information of the item so that the next invocation
00021 //   of undo() does a redo (i.e. undoes the undone operation).
00022         virtual void undo();
00023 
00024 // Return the amount of memory used for the data associated with this
00025 // object in order to enable limiting the amount of memory used by the
00026 // undo stack.
00027 // Ignore overhead and just report the specific data values that the
00028 // derived object adds.
00029         virtual int get_size();
00030         
00031         
00032 // command description for the menu item
00033         char *description;
00034 // who created this item
00035         void* creator;
00036 };
00037 
00038 #endif

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