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HISTORY.H
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C/C++ Source or Header
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1980-01-05
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60 lines
/*
* Copyright (c) 1987, 1988, 1989 Stanford University
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Stanford not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. Stanford makes no representations about
* the suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* STANFORD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
* IN NO EVENT SHALL STANFORD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
// $Header: history.h,v 1.7 89/10/09 14:48:07 linton Exp $
// declares class History.
#ifndef history_h
#define history_h
#include <InterViews/defs.h>
// Declare imported types.
class ChangeNode;
class ChangeList;
class Interactor;
// A History maintains a log of changes made to the drawing to permit
// changes to be undone.
class History {
public:
History(Interactor*);
~History();
boolean IsEmpty();
void Clear();
void Do(ChangeNode*);
void Redo();
void Undo();
protected:
int maxhistory; // maximum number of changes to store
ChangeList* changelist; // stores changes to drawing
};
#endif