81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
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/*
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LICENSE
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-------
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Copyright 2005 Nullsoft, Inc.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the name of Nullsoft nor the names of its contributors may be used to
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endorse or promote products derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _UNDO_H_
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#define _UNDO_H_
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class C_UndoStack;
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class C_UndoItem
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{
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friend C_UndoStack;
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public:
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C_UndoItem();
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~C_UndoItem();
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C_UndoItem(const C_UndoItem& T);
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C_UndoItem(void *data, int length, bool isdirty);
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C_UndoItem & operator = (const C_UndoItem& T);
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bool operator == (const C_UndoItem& T) const;
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void set(void *data, int length, bool isdirty);
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void *get() const { return data; }
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int size() const { return length; }
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private:
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void *data;
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int length;
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bool isdirty;
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};
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class C_UndoStack
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{
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public:
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static void saveundo(int is2=0);
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static void cleardirty();
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static bool isdirty();
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static void undo();
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static void redo();
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static int can_undo();
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static int can_redo();
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static void clear();
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private:
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// sorry to do this mig, but that doubly linked lists made me scared. I think it
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// wasn't actually the source of my bug (I later fixed it), but doubly linked lists
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// are just plain hard to get right. :)
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static int list_pos;
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static C_UndoItem *list[256]; // only keep 256 elements in list at a time
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};
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#endif//_UNDO_H_
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