public static void ListView_SetHeaderSortIndicator(IntPtr hWnd, Int32 columnIdx, System.Windows.Forms.SortOrder order)
{
IntPtr header = ListView_GetHeader(hWnd);
Int32 nofColumns = Header_GetItemCount(header);
for (int i = 0; i < nofColumns; i++)
{
HdItem item = new HdItem();
item.mask = HDI_FORMAT;
item = Header_GetItem(header, i, item);
if (i == columnIdx)
{
item.fmt &= ~(HDF_SORTDOWN | HDF_SORTUP);
if (order == SortOrder.Ascending)
{
item.fmt |= HDF_SORTUP;
}
else if (order == SortOrder.Descending)
{
item.fmt |= HDF_SORTDOWN;
}
}
else
{
item.fmt &= ~(HDF_SORTDOWN | HDF_SORTUP);
}
Header_SetItem(header, i, ref item);
}
}
private static void Header_SetItem(IntPtr headerHWnd, Int32 columnIndex, ref HdItem info)
{
Int32 size = Marshal.SizeOf(info);
IntPtr p = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(info, p, true);
IntPtr result = SendMessage(headerHWnd, HDM_SETITEM, new UIntPtr((uint)columnIndex), p);
Marshal.FreeHGlobal(p);
}
private static HdItem Header_GetItem(IntPtr headerHWnd, Int32 columnIndex, HdItem info)
{
Int32 size = Marshal.SizeOf(info);
IntPtr p = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(info, p, true);
IntPtr result = SendMessage(headerHWnd, HDM_GETITEM, new UIntPtr((uint)columnIndex), p);
HdItem updated = (HdItem)Marshal.PtrToStructure(p, typeof(HdItem));
Marshal.FreeHGlobal(p);
return(updated);
}
