75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
/**
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* @file llundo.h
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* @brief Generic interface for undo/redo circular buffer.
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*
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* $LicenseInfo:firstyear=2000&license=viewergpl$
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*
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* Copyright (c) 2000-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LL_LLUNDO_H
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#define LL_LLUNDO_H
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class LLUndoBuffer
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{
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public:
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class LLUndoAction
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{
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friend class LLUndoBuffer;
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public:
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virtual void undo() = 0;
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virtual void redo() = 0;
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virtual void cleanup() {};
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protected:
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LLUndoAction(): mClusterID(0) {};
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virtual ~LLUndoAction(){};
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private:
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S32 mClusterID;
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};
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LLUndoBuffer( LLUndoAction (*create_func()), S32 initial_count );
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virtual ~LLUndoBuffer();
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LLUndoAction *getNextAction(BOOL setClusterBegin = TRUE);
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BOOL undoAction();
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BOOL redoAction();
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BOOL canUndo() { return (mNextAction != mFirstAction); }
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BOOL canRedo() { return (mNextAction != mLastAction); }
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void flushActions();
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private:
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LLUndoAction **mActions; // array of pointers to undoactions
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S32 mNumActions; // total number of actions in ring buffer
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S32 mNextAction; // next action to perform undo/redo on
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S32 mLastAction; // last action actually added to undo buffer
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S32 mFirstAction; // beginning of ring buffer (don't undo any further)
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S32 mOperationID; // current operation id, for undoing and redoing in clusters
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};
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#endif //LL_LLUNDO_H
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