void ComboBoxWrap_DrawItem(object sender, DrawItemEventArgs e)
{
if (e.Index < 0)
{
return;
}
// draw a lighter blue selected BG colour, the dark blue default has poor contrast with black text on a dark blue background
if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
{
e.Graphics.FillRectangle(Brushes.PowderBlue, e.Bounds);
}
else
{
e.Graphics.FillRectangle(Brushes.White, e.Bounds);
}
// get the text of the item
ComboBoxWrap ddl = (ComboBoxWrap)sender;
string text = ddl.Items[e.Index].ToString();
// don't dispose the brush afterwards
Brush b = Brushes.Black;
e.Graphics.DrawString(text, this.Font, b, e.Bounds, StringFormat.GenericDefault);
// draw a light grey border line to separate the items
Pen p = new Pen(Brushes.Gainsboro, 1);
e.Graphics.DrawLine(p, new Point(e.Bounds.Left, e.Bounds.Bottom - 1), new Point(e.Bounds.Right, e.Bounds.Bottom - 1));
p.Dispose();
e.DrawFocusRectangle();
}
void ComboBoxWrap_MeasureItem(object sender, MeasureItemEventArgs e)
{
// set the height of the item, using MeasureString with the font and control width
ComboBoxWrap ddl = (ComboBoxWrap)sender;
string text = ddl.Items[e.Index].ToString();
SizeF size = e.Graphics.MeasureString(text, this.Font, ddl.DropDownWidth);
e.ItemHeight = (int)Math.Ceiling(size.Height) + 1; // plus one for the border
e.ItemWidth = ddl.DropDownWidth;
System.Diagnostics.Trace.WriteLine(String.Format("Height {0}, Text {1}", e.ItemHeight, text));
}
