hvirtual/cinelerra/mainundo.h

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#ifndef MAINUNDO_H
#define MAINUNDO_H


#include "bctimer.inc"
#include "linklist.h"
#include "mwindow.inc"

#include <stdint.h>


class UndoStackItem;
class MainUndoStackItem;


class MainUndo
{
public:
        MainUndo(MWindow *mwindow);
        ~MainUndo();

   // Use this function for UndoStackItem subclasses with custom
   // undo and redo functions.  All fields including description must
   // be populated before calling this function.
   void push_undo_item(UndoStackItem *item);

        void update_undo(char *description, 
                uint32_t load_flags, 
                void *creator = 0,
                int changes_made = 1);

// alternatively, call this one after the change
        void push_state(char *description, uint32_t load_flags, void* creator);

// Used in undo and redo to reset the creators in all the records.
        void reset_creators();

        int undo();
        int redo();

private:
        List<UndoStackItem> undo_stack;
        List<UndoStackItem> redo_stack;
        MainUndoStackItem* new_entry;   // for setting the after buffer

        MWindow *mwindow;
        Timer *last_update;
        char* data_after;       // the state after a change

        void capture_state();
        void prune_undo();
        bool ignore_push(char *description, uint32_t load_flags, void* creator);

        friend class MainUndoStackItem;
};

#endif

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