69 lines
2.2 KiB
C++
69 lines
2.2 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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* $LicenseInfo:firstyear=2000&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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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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