c#新手笔记之颜色下拉框

颜色填充下拉框

代码:

using System.Reflection;

 private void FillColorToCmb(ComboBox cmb)
        ...{
            cmb.DrawMode = DrawMode.OwnerDrawFixed;
            cmb.DropDownStyle = ComboBoxStyle.DropDownList;
            cmb.DrawItem +=new DrawItemEventHandler(cmb_DrawItem);
            cmb.ItemHeight = 18;
            cmb.BeginUpdate();
            cmb.Items.Clear();           
            foreach(PropertyInfo pi in typeof(Color).GetProperties(BindingFlags.Public|BindingFlags.Static))
            ...{
                cmb.Items.Add(pi.Name);
            }
            cmb.EndUpdate();
        }

        void  cmb_DrawItem(object sender, DrawItemEventArgs e)
        ...{
            if(e.Index<0)
                return;
            e.DrawBackground();
            Rectangle rect = new Rectangle(4, e.Bounds.Top + 2, e.Bounds.Height+10, e.Bounds.Height - 4);         
            ComboBox cmb = (ComboBox)sender;
            string colorName = cmb.Items[e.Index].ToString();
            SolidBrush b = new SolidBrush(Color.FromName(colorName));
            e.Graphics.FillRectangle(b, rect);
            e.Graphics.DrawRectangle(Pens.Black, rect);
            Font myFont = new Font(FontFamily.GenericSansSerif, 10, FontStyle.Regular);
            e.Graphics.DrawString(colorName, myFont, Brushes.Black,
                new RectangleF(e.Bounds.X + rect.Width + 4, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height));
            e.DrawFocusRectangle();
        }