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How do I implement an ownerdrawn listbox

Platform: WinForms| Category: ListBox

Check out this sample project at gotnetdot.com. It derives from Form and implements the owner drawing by handling the DrawItem event and MeasureItem event.

You can also download a sample that implements an owner drawn listbox by deriving from ListBox and overriding the virtual methods OnDrawItem and OnMeasureItem. Here is a OnDrawItem override that draws colored rectangles in the listbox.

protected override void OnDrawItem(System.Windows.Forms.DrawItemEventArgs e)
{
  //undo the selection rect on the old selection
  if( oldSelectedRect != e.Bounds &&
    oldSelectedIndex > -1 && oldSelectedIndex < Items.Count)
  {
    e.Graphics.DrawRectangle(new Pen((Color) Items[oldSelectedIndex], 2), oldSelectedRect);
  }

  //draw the item .. here we just fill a rect
  if( e.Index > -1 && e.Index < Items.Count)
    e.Graphics.FillRectangle(new SolidBrush( (Color)Items[e.Index] ), e.Bounds);
  
  //draw selection rect if needed
  if(SelectedIndex == e.Index)
  {
    e.Graphics.DrawRectangle(new Pen(Color.Black,2), e.Bounds);
    oldSelectedRect = e.Bounds;
    oldSelectedIndex = e.Index;
  }
}

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