private void cbAlpha_SelectedIndexChanged(object sender, EventArgs e)
{
// update the alpha color
MyComboBoxItem cb = cbAlpha.SelectedItem as MyComboBoxItem;
if (cb != null)
{
String c = cb.Value.ToString();
img2LZW.UpdateAlpha(c);
}
}
protected override void OnDrawItem(DrawItemEventArgs e)
{
base.OnDrawItem(e);
e.DrawBackground();
if (e.Index >= 0)
{
MyComboBoxItem item = (MyComboBoxItem)this.Items[e.Index];
Brush brush = new SolidBrush(item.BackColor);
e.Graphics.FillRectangle(brush, e.Bounds);
Brush fontBrush = item.BackColor.GetBrightness() > 0.5f ? Brushes.Black : Brushes.White;
e.Graphics.DrawString(item.Text, this.Font, fontBrush, e.Bounds.X, e.Bounds.Y);
}
}
