Second Life viewer sources 1.13.2.12

1 files changed, 71 insertions, 0 deletions

diff --git a/linden/indra/llui/llundo.h b/linden/indra/llui/llundo.h
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+/** 
+ * @file llundo.h
+ * @brief LLUndo class header file
+ *
+ * Copyright (c) 2000-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#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