// customized drawing process
protected override void OnDrawItem(DrawItemEventArgs e)
{
// draw background & focus rect
e.DrawBackground();
e.DrawFocusRectangle();
// check if it is an item from the Items collection
if (e.Index < 0)
{
// not an item, draw the text (indented)
e.Graphics.DrawString(this.Text, e.Font, new SolidBrush(e.ForeColor), e.Bounds.Left + imgs.ImageSize.Width, e.Bounds.Top);
}
else
{
// check if item is an ImageComboItem
if (this.Items[e.Index].GetType() == typeof(ImageComboItem))
{
// get item to draw
ImageComboItem item = (ImageComboItem)this.Items[e.Index];
// get forecolor & font
Color forecolor = (item.ForeColor != Color.FromKnownColor(KnownColor.Transparent)) ? item.ForeColor : e.ForeColor;
Font font = item.Mark ? new Font(e.Font, FontStyle.Bold) : e.Font;
// -1: no image
if (item.ImageIndex != -1)
{
// draw image, then draw text next to it
this.ImageList.Draw(e.Graphics, e.Bounds.Left, e.Bounds.Top, item.ImageIndex);
e.Graphics.DrawString(item.Text, font, new SolidBrush(forecolor), e.Bounds.Left + imgs.ImageSize.Width, e.Bounds.Top);
}
else
{
// draw text (indented)
e.Graphics.DrawString(item.Text, font, new SolidBrush(forecolor), e.Bounds.Left + imgs.ImageSize.Width, e.Bounds.Top);
}
}
else
{
// it is not an ImageComboItem, draw it
e.Graphics.DrawString(this.Items[e.Index].ToString(), e.Font, new SolidBrush(e.ForeColor), e.Bounds.Left + imgs.ImageSize.Width, e.Bounds.Top);
}
}
base.OnDrawItem(e);
}
public void BuildDriveList()
{
base.Items.Clear();
ShellAPI.SHFILEINFO shInfo = new ShellAPI.SHFILEINFO();
ShellAPI.SHGFI dwAttribs = ShellAPI.SHGFI.SHGFI_ICON | ShellAPI.SHGFI.SHGFI_SMALLICON | ShellAPI.SHGFI.SHGFI_SYSICONINDEX | ShellAPI.SHGFI.SHGFI_DISPLAYNAME;
ListDictionary iconDictionary = new ListDictionary();
foreach (string drive in Directory.GetLogicalDrives())
{
IntPtr m_pHandle = ShellAPI.SHGetFileInfo(drive, ShellAPI.FILE_ATTRIBUTE_NORMAL, ref shInfo, (uint)Marshal.SizeOf(shInfo), dwAttribs);
if (m_pHandle.Equals(IntPtr.Zero) == false)
{
int idxIcon = 0;
if (iconDictionary.Contains(shInfo.iIcon) == false)
{
ImageList.Images.Add(Icon.FromHandle(shInfo.hIcon).Clone() as Icon);
User32API.DestroyIcon(shInfo.hIcon);
iconDictionary.Add(shInfo.iIcon, iconDictionary.Count);
idxIcon = iconDictionary.Count - 1;
}
else
{
idxIcon = Convert.ToInt32(iconDictionary[shInfo.iIcon]);
}
ImageComboItem item = new ImageComboItem(shInfo.szDisplayName, idxIcon, false);
item.ItemValue = drive;
base.Items.Add(item);
}
}
if (base.Items.Count != 0)
{
base.SelectedIndex = 0;
}
}