Custom controls and event handling?

Question

I have a windows custom control with a picturebox and a button on it's default panel. This windows custom control will be added to a windows form. There is another windows form called form2. when the user double clicks on the custom control, it should load form2. in designer when i double clicked the custom control on the form, it creates a load() event for that custom control. But i need double click event, how this can be done?

here is the graphical view of what happens

Here is code in the control

    [DefaultEvent("DoubleClick")]
public partial class cntrlImageLoader : UserControl
{
    public cntrlImageLoader()
    {
        InitializeComponent();
    }

    private void btnBrowse_Click(object sender, EventArgs e)
    {
        OpenFileDialog ofd = new OpenFileDialog();
        ofd.InitialDirectory = Environment.SpecialFolder.MyPictures.ToString();
        if (ofd.ShowDialog() == DialogResult.OK)
        {
            pbImage.Image = Image.FromFile(ofd.FileName);
        }
    }

    private void pbImage_Click(object sender, EventArgs e)
    {
        this.cntrlImageLoader_DoubleClick(pbImage, e);
    }

    private void cntrlImageLoader_Load(object sender, EventArgs e)
    {

    }

    private void cntrlImageLoader_DoubleClick(object sender, EventArgs e)
    {

    }
}

Here is the calling code on form1

private void cntrImLdrFront_DoubleClick(object sender, EventArgs e)
{
     //this.cntrImLdrFront.pbImage.DoubleClick += new EventHandler(pbImage_DoubleClick);

}

FrmImageViewer f; // this is form2
private void pbImage_DoubleClick(object sender, EventArgs e)
{
    f= new FrmImageViewer();
    f.MdiParent = this.MdiParent;
    f.Show();
}

Answer 1

Assign the attribute [DefaultEvent("DoubleClick")] at the class declaration.

[DefaultEvent("DoubleClick")]
public partial class MyControl : UserControl
{
}

This will creates event which you have set by default on double click of control at design time where you have placed your user control.

EDITED:

[DefaultEvent("LoadPicture")]
public partial class cntrlImageLoader : UserControl
{
    public delegate void LoadPictureEventHandler(object sender, LoadPictureEventArgs e);
    public event LoadPictureEventHandler LoadPicture;

    private void pbImage_DoubleClick(object sender, EventArgs e)
    {
        if (LoadPicture != null)
        {
            LoadPictureEventArgs ev = new LoadPictureEventArgs();
            LoadPicture(this, ev);
            if (ev.Picture != null)
            {
                pbImage.Image = ev.Picture;
            }
        }
    }          
}

Create another class and give that class name to LoadPictureEventArgs

public class LoadPictureEventArgs : EventArgs
{
    public Image Picture {get; set;}
    public LoadPictureEventArgs(Image _picture)
    {
        Picture = _picture
    }
    public LoadPictureEventArgs()
                    : base()
    {
    }
}

HOW TO USE IT?

//FORM1
private void cntrImLdrFron_LoadPicture(object sender, LoadPictureEventArgs e)
{
    Image img = null;
    //LOAD YOUR IMAGE HERE
    e.Picture = img;

}