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CommandManager.h
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/*
* Copyright (C) 2018 Me and My Shadow
*
* This file is part of Me and My Shadow.
*
* Me and My Shadow is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Me And My Shadow is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Me and My Shadow. If not, see <http://www.gnu.org/licenses/>.
*/
// An undo/redo system based on <http://www.codeproject.com/Articles/2500/A-Basic-Undo-Redo-Framework-For-C>.
// Originally written by squarecross <https://forum.freegamedev.net/viewtopic.php?f=48&t=5432>.
#ifndef COMMANDMANAGER_H
#define COMMANDMANAGER_H
#include <string>
#include <vector>
class Command;
//Class to manage command history using a redo and an undo stack.
class CommandManager {
private:
//Keeps track of all commands that can be undone.
std::vector<Command*> undoList;
//Maximum depth of the undo stack.
int undoLevel;
//Point to the current undo command
int currentCommand;
//If current undo command equal to this then we say the document is unchanged. Can be -1.
int pivot;
public:
//Constructor, default undoLevel is 100.
CommandManager(int nUndoLevel = 100) : undoLevel(nUndoLevel), currentCommand(0), pivot(0) {}
//Deconstructor: Clears the stacks.
~CommandManager() {
destroy();
}
public:
//Checks if anything is in the undo stack.
bool canUndo() const;
//Checks if anything is in the redo stack.
bool canRedo() const;
//A short description of the undo operation
std::string describeUndo();
//A short description of the redo operation
std::string describeRedo();
//Return undoLevel.
int getUndoLevel() const;
//Set undoLevel.
void setUndoLevel(int newValue);
//Check if the document is changed.
bool isChanged() const;
public:
//Performs the given command and adds it to the undo list.
void doCommand(Command* command);
//Undo the command and add command to redo stack.
void undo();
//Redo the command and adds command to undo stack.
void redo();
//Clear the stacks.
void destroy();
//Set the changeCounter to 0.
void resetChange();
};
#endif

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