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Memento.cs
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Memento.cs
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using System;
using System.Collections.Generic;
namespace Memento
{
public struct Point
{
public int X;
public int Y;
public Point(int x, int y)
{
X = x;
Y = y;
}
public override string ToString()
{
return $"Point({X}, {Y})";
}
}
// OBJECT DRAING
public class Drawing
{
public List<Point> points { get; private set; }
public Drawing()
{
this.points = new List<Point>();
}
public void Add(Point point)
{
this.points.Add(point);
}
public MementoDrawing SaveState()
{
return new MementoDrawing(this);
}
public void RestoreState(MementoDrawing newState) {
this.points.Clear();
foreach (Point point in newState.Points)
{
points.Add(point);
}
}
}
// MEMENTO
public class MementoDrawing
{
public List<Point> Points { get; private set; }
public MementoDrawing(Drawing drawing)
{
this.Points = new List<Point>();
foreach (Point point in drawing.points)
{
Points.Add(point);
}
}
public override string ToString()
{
string text = "MementoDrawing\n";
foreach(var item in this.Points)
{
text += $"{item.ToString()}\n";
}
text += "\n";
return text;
}
}
// CARETAKER
public class HistoryDrawing
{
public Stack<MementoDrawing> Drawings { get; private set; }
public HistoryDrawing()
{
this.Drawings = new Stack<MementoDrawing>();
}
public void Push(MementoDrawing drawing)
{
this.Drawings.Push(drawing);
}
public MementoDrawing Pop()
{
return this.Drawings.Pop();
}
}
}