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ListBox with Icons

, 8 Apr 2002
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Listbox Control with an image property for every item

Introduction

All of us like more color or image in our control, so do I.

In this article, I give each item in the custom ListBox class an image property.

Note: my article has no source code because it very short and easy.

First: we create 2 classes for GListBox

// GListBoxItem class 
public class GListBoxItem
{
    private string _myText;
    private int _myImageIndex;
    // properties 
    public string Text
    {
        get {return _myText;}
        set {_myText = value;}
    }
    public int ImageIndex
    {
        get {return _myImageIndex;}
        set {_myImageIndex = value;}
    }
    //constructor
    public GListBoxItem(string text, int index)
    {
        _myText = text;
        _myImageIndex = index;
    }
    public GListBoxItem(string text): this(text,-1){}
    public GListBoxItem(): this(""){}
    public override string ToString()
    {
        return _myText;
    }
}//End of GListBoxItem class

// GListBox class 
public class GListBox : ListBox
{
    private ImageList _myImageList;
    public ImageList ImageList
    {
        get {return _myImageList;}
        set {_myImageList = value;}
    }
    public GListBox()
    {
        // Set owner draw mode
        this.DrawMode = DrawMode.OwnerDrawFixed;
    }
    protected override void OnDrawItem(System.Windows.Forms.DrawItemEventArgs e)
    {
        e.DrawBackground();
        e.DrawFocusRectangle();
        GListBoxItem item;
        Rectangle bounds = e.Bounds;
        Size imageSize = _myImageList.ImageSize;
        try
        {
            item = (GListBoxItem) Items[e.Index];
            if (item.ImageIndex != -1)
            {
                imageList.Draw(e.Graphics, bounds.Left,bounds.Top,item.ImageIndex); 
                e.Graphics.DrawString(item.Text, e.Font, new SolidBrush(e.ForeColor), 
                    bounds.Left+imageSize.Width, bounds.Top);
            }
            else
            {
                e.Graphics.DrawString(item.Text, e.Font,new SolidBrush(e.ForeColor),
                    bounds.Left, bounds.Top);
            }
        }
        catch
        {
            if (e.Index != -1)
            {
                e.Graphics.DrawString(Items[e.Index].ToString(),e.Font, 
                    new SolidBrush(e.ForeColor) ,bounds.Left, bounds.Top);
            }
            else
            {
                e.Graphics.DrawString(Text,e.Font,new SolidBrush(e.ForeColor),
                    bounds.Left, bounds.Top);
            }
        }
        base.OnDrawItem(e);
    }
}//End of GListBox class

After that, in order to use our code, we could do:

GListBox lb = new GListBox();
lb.ImageList = imageList;
lb.Items.Add( new GListBoxItem("Image 1",0));
lb.Items.Add( new GListBoxItem("Image 2",1));
lb.Items.Add( new GListBoxItem("Image 3",2));

That's all and thanks for reading.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

nhgiang
Web Developer
Vietnam Vietnam
Nguyen Ha Giang,BS(computer science).

Comments and Discussions

 
GeneralCode Fixes Pinmemberdean.wilde27-Jun-08 13:02 

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