| Printable Version
ComboBox With Images
By Rakka Rage
There is no built in support for a ComboBox with images. So i created a
simple ComboBoxEx class that derives from ComboBox and allows you to set the
ComboBoxEx.ImageList property and ComboBoxExItem.ImageIndex property so that
the ComboBox displays an image.
...
ComboBoxEx comboBox = new ComboBoxEx();
comboBox.ImageList = imageList;
// not needed but... no icon for index -1 else
comboBox.DropDownStyle = ComboBoxStyle.DropDownList;
// just pass these in instead of strings, class included below
// specify a valid imageIndex
comboBox.Items.Add(new ComboBoxExItem("Text0", 0));
comboBox.Items.Add(new ComboBoxExItem("Text1", 1));
Code:
namespace Rage.Library
{
class ComboBoxEx : ComboBox
{
private ImageList imageList;
public ImageList ImageList
{
get {return imageList;}
set {imageList = value;}
}
public ComboBoxEx()
{
DrawMode = DrawMode.OwnerDrawFixed;
}
protected override void OnDrawItem(DrawItemEventArgs ea)
{
ea.DrawBackground();
ea.DrawFocusRectangle();
ComboBoxExItem item;
Size imageSize = imageList.ImageSize;
Rectangle bounds = ea.Bounds;
try
{
item = (ComboBoxExItem)Items[ea.Index];
if (item.ImageIndex != -1)
{
imageList.Draw(ea.Graphics, bounds.Left, bounds.Top,
item.ImageIndex);
ea.Graphics.DrawString(item.Text, ea.Font, new
SolidBrush(ea.ForeColor), bounds.Left+imageSize.Width, bounds.Top);
}
else
{
ea.Graphics.DrawString(item.Text, ea.Font, new
SolidBrush(ea.ForeColor), bounds.Left, bounds.Top);
}
}
catch
{
if (ea.Index != -1)
{
ea.Graphics.DrawString(Items[ea.Index].ToString(), ea.Font, new
SolidBrush(ea.ForeColor), bounds.Left, bounds.Top);
}
else
{
ea.Graphics.DrawString(Text, ea.Font, new
SolidBrush(ea.ForeColor), bounds.Left, bounds.Top);
}
}
base.OnDrawItem(ea);
}
}
class ComboBoxExItem
{
private string _text;
public string Text
{
get {return _text;}
set {_text = value;}
}
private int _imageIndex;
public int ImageIndex
{
get {return _imageIndex;}
set {_imageIndex = value;}
}
public ComboBoxExItem()
: this("") {
}
public ComboBoxExItem(string text)
: this(text, -1) {
}
public ComboBoxExItem(string text, int imageIndex)
{
_text = text;
_imageIndex = imageIndex;
}
public override string ToString()
{
return _text;
}
}
}
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