ECCommand.h

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Command Design Pattern for Undo/Redo
// Daniel Backal
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


#ifndef ECCOMMAND_H
#define ECCOMMAND_H

#include <vector>

// ******************************************************
// Implementing command design pattern

class ECCommand
{
public:
    virtual ~ECCommand() {}
    virtual void Execute() = 0;
    virtual void UnExecute() = 0;
};

// ******************************************************
// Implementing command history

class ECCommandHistory
{
public:
    ECCommandHistory();
    virtual ~ECCommandHistory();
    bool Undo();
    bool Redo();
    void ExecuteCmd( ECCommand *pCmd );
    void EmptyRedo();
    
private:
    // Need to keep track of commands ran
    // Should use vector, and undo pops back (puts it in redo vector)
    // But also, if a new command is called after an undo, clear the redo vector.
    std::vector<ECCommand *> undoList;
    std::vector<ECCommand *> redoList;
};


#endif