private void Shape_ShapeChanged(object sender, ShapeEventArgs e)
{
Shape shape = (Shape)sender;
Console.WriteLine($"Event fires. Shape area is {e.NewArea}");
shape.Draw();
}
public void Update(double radius)
{
this.radius = radius;
area = CircleArea(radius);
ShapeEventArgs args = new ShapeEventArgs(area);
OnShapeChanged(args);
}
public void Update(double width, double height)
{
ShapeEventArgs args = new ShapeEventArgs(width * height);
OnShapeChanged(args);
}
protected override void OnShapeChanged(ShapeEventArgs e)
{
base.OnShapeChanged(e);
}
protected virtual void OnShapeChanged(ShapeEventArgs e)
{
EventHandler <ShapeEventArgs> handler = ShapeChanged;
handler?.Invoke(this, e);
}