C# Pitanje - DragDrop, ArrayList, PictureBox

http://www.marcclifton.com/Articles/Tutorials/SimpleDragAndDropExample/tabid/54/Default.aspx

namespace DragAndDrop {

Form1.cs

public partial class Form1 : Form {

        InitializeComponent();

        listView1.DragOver += new DragEventHandler(listView1_DragOver);

        listView1.DragDrop += new DragEventHandler(listView1_DragDrop);

    }

    private void listView1_DragDrop(object sender, DragEventArgs e) {

        Racunalo<KomponentaCollection> racunalo = (Racunalo<KomponentaCollection>)e.Data.GetData(typeof(Racunalo<KomponentaCollection>));

        RacunaloListItem l = new RacunaloListItem();

        l.RacunaloItem = racunalo;

        l.Label = racunalo.Name;

        l.Text = l.Label;

        listView1.Items.Add(l);

    }

    private void listView1_DragOver(object sender, DragEventArgs e) {

        if (e.Data.GetData(typeof(Racunalo<KomponentaCollection>)) == null) e.Effect = DragDropEffects.None;

        else e.Effect = DragDropEffects.Copy;

    }

}

public class RacunaloListItem : ListViewItem {

    public string Label { get; set; }

    public Racunalo<KomponentaCollection> RacunaloItem { get; set; }

    public override string ToString() { return Label; }

}

RacunaloKontrola.cspublic partial class RacunaloKontrola : UserControl {

    public RacunaloKontrola() {

        InitializeComponent();

        pictureBox1.Paint += new PaintEventHandler(pictureBox1_Paint);

        this.MouseDown += new MouseEventHandler(RacunaloKontrola_MouseDown);

        pictureBox1.MouseDown += new MouseEventHandler(RacunaloKontrola_MouseDown);

        linkLabel1.MouseDown += new MouseEventHandler(RacunaloKontrola_MouseDown);

    }

    private void RacunaloKontrola_MouseDown(object sender, MouseEventArgs e) {

        if (e.Button == MouseButtons.Left) this.DoDragDrop(AddRacunalo(), DragDropEffects.All);

    }

    public Racunalo<KomponentaCollection> AddRacunalo() {

        Random rnd = new Random(Environment.TickCount);

        KomponentaCollection kc = new KomponentaCollection();

        kc.AddKomponenta(rnd.Next(0, 20));

        Racunalo<KomponentaCollection> r = new Racunalo<KomponentaCollection>();

        r.KolekcijaKomponenti = kc;

        r.RType = (RacunaloType)rnd.Next(0, 2);

        r.Name = Guid.NewGuid().ToString();

        this.BackColor = Color.FromArgb(rnd.Next(0, int.MaxValue));

        linkLabel1.Text = r.Name;

        pictureBox1.Refresh();

        return r;

    }

    private void pictureBox1_Paint(object sender, PaintEventArgs e) {

        e.Graphics.DrawString(linkLabel1.Text, this.Font, Brushes.Black,

            (this.Width - e.Graphics.MeasureString(linkLabel1.Text, this.Font).Width) / 2, this.Height / 2);

    }

}

public enum RacunaloType { DESKTOP = 0, LAPTOP, NEPTOP }

public struct Komponenta {

    public string Name;

    public string Desciption;

}

public class KomponentaCollection : List<Komponenta> {

    public void AddKomponenta(int KomponentaCount) {

        Komponenta[] kal = new Komponenta[KomponentaCount];

        Random rnd = new Random(Environment.TickCount);

        Komponenta k;

        for (int i = 0; i < kal.Length; i++) {

            kal[i] = new Komponenta();

            k = kal[i];

            k.Name = "K:" + (i + 1).ToString();

            k.Desciption = (i + i).ToString() + " - " + rnd.Next().ToString();

            this.Add(k);

        }

    }

}

public class Racunalo<KomponentaCollection> {

    public string Name { get; set; }

    public RacunaloType RType { get; set; }

    public KomponentaCollection KolekcijaKomponenti { get; set; }

}

} //namespace