private void SetColumnFormat(int column, HDITEM.Format format)
{
IntPtr hresult;
IntPtr columnHeader = SendMessage(this.Handle, LVM_GETHEADER, IntPtr.Zero, IntPtr.Zero);
HDITEM item = new HDITEM();
item.mask = HDITEM.Mask.Format;
item.fmt = format;
//hresult = SendMessage(columnHeader, HDM_GETITEM, (IntPtr) column, ref item);
//if (hresult != TRUE) return;
//item.fmt |= format;
hresult = SendMessage(columnHeader, HDM_SETITEM, (IntPtr)column, ref item);
}
public void DisplaySortImageOnColumn(int column, SortImage image)
{
HDITEM.Format format = GetColumnFormat(column);
// Reset any existing sort images
format &= ~HDITEM.Format.SortDown;
format &= ~HDITEM.Format.SortUp;
// Set new image (if any)
if (image == SortImage.Ascending)
{
format |= HDITEM.Format.SortUp;
}
else if (image == SortImage.Descending)
{
format |= HDITEM.Format.SortDown;
}
SetColumnFormat(column, format);
}
