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/**
* @file llundo.h
* @brief LLUndo class header file
*
* Copyright (c) 2000-$CurrentYear$, Linden Research, Inc.
* $License$
*/
#ifndef LL_LLUNDO_H
#define LL_LLUNDO_H
class LLUndoAction
{
friend class LLUndoBuffer;
protected:
S32 mClusterID;
protected:
LLUndoAction(): mClusterID(0) {};
virtual ~LLUndoAction(){};
public:
static LLUndoAction *create() { return NULL; }
virtual void undo() = 0;
virtual void redo() = 0;
virtual void cleanup() {};
};
class LLUndoBuffer
{
protected:
LLUndoAction **mActions; // array of pointers to undoactions
S32 mNumActions; // total number of actions in ring buffer
S32 mNextAction; // next action to perform undo/redo on
S32 mLastAction; // last action actually added to undo buffer
S32 mFirstAction; // beginning of ring buffer (don't undo any further)
S32 mOperationID; // current operation id, for undoing and redoing in clusters
public:
LLUndoBuffer( LLUndoAction (*create_func()), S32 initial_count );
virtual ~LLUndoBuffer();
LLUndoAction *getNextAction(BOOL setClusterBegin = TRUE);
BOOL undoAction();
BOOL redoAction();
BOOL canUndo() { return (mNextAction != mFirstAction); }
BOOL canRedo() { return (mNextAction != mLastAction); }
void flushActions();
};
#endif //LL_LLUNDO_H
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