public static void SetSortIcon(this ListView listView, int columnIndex, SortOrder order)
{
var hr = new HandleRef(listView, listView.Handle);
var columnHeader = SendMessage(hr, ComCtl32.ListViewMessage.LVM_GETHEADER, 0, IntPtr.Zero);
var chr = new HandleRef(listView, columnHeader);
for (var columnNumber = 0; columnNumber <= listView.Columns.Count - 1; columnNumber++)
{
// Get current ListView column info
var lvcol = new ComCtl32.LVCOLUMN(ComCtl32.ListViewColumMask.LVCF_FMT);
SendMessage(hr, ComCtl32.ListViewMessage.LVM_GETCOLUMN, columnNumber, lvcol);
// Get current header info
var hditem = new ComCtl32.HDITEM(ComCtl32.HeaderItemMask.HDI_FORMAT | ComCtl32.HeaderItemMask.HDI_DI_SETITEM);
SendMessage(chr, ComCtl32.HeaderMessage.HDM_GETITEM, columnNumber, hditem);
// Update header with column info
hditem.Format |= (ComCtl32.HeaderItemFormat)((uint)lvcol.Format & 0x1001803);
if ((lvcol.Format & ComCtl32.ListViewColumnFormat.LVCFMT_NOTITLE) == 0)
{
hditem.ShowText = true;
}
// Set header image info
if (order != SortOrder.None && columnNumber == columnIndex)
{
hditem.ImageDisplay = (order == SortOrder.Descending) ? ComCtl32.HeaderItemImageDisplay.DownArrow : ComCtl32.HeaderItemImageDisplay.UpArrow;
}
else
{
hditem.ImageDisplay = ComCtl32.HeaderItemImageDisplay.None;
}
// Update header
SendMessage(chr, ComCtl32.HeaderMessage.HDM_SETITEM, columnNumber, hditem);
}
}
public static void SetColumnDropDown(this ListView listView, int columnIndex, bool enable)
{
if (((columnIndex < 0) || ((columnIndex >= 0) && (listView.Columns == null))) || (columnIndex >= listView.Columns.Count))
{
throw new ArgumentOutOfRangeException(nameof(columnIndex));
}
if (listView.IsHandleCreated)
{
var lvc = new ComCtl32.LVCOLUMN(ComCtl32.ListViewColumMask.LVCF_FMT);
var hr = new HandleRef(listView, listView.Handle);
SendMessage(hr, ComCtl32.ListViewMessage.LVM_GETCOLUMN, columnIndex, lvc);
if (enable)
{
lvc.Format |= ComCtl32.ListViewColumnFormat.LVCFMT_SPLITBUTTON;
}
else
{
lvc.Format &= (~ComCtl32.ListViewColumnFormat.LVCFMT_SPLITBUTTON);
}
SendMessage(hr, ComCtl32.ListViewMessage.LVM_SETCOLUMN, columnIndex, lvc);
listView.InvalidateHeader();
}
}
