protected virtual bool PreProcessWmKeyDown_Up(ref Message m)
{
long pos = _hexBox._bytePos;
int cp = _hexBox._byteCharacterPos;
if( !(pos == 0 && cp == 0) )
{
pos = Math.Max(-1, pos-_hexBox._iHexMaxHBytes);
if(pos == -1)
return true;
_hexBox.SetPosition(pos);
if(pos < _hexBox._startByte)
{
_hexBox.PerformScrollLineUp();
}
_hexBox.UpdateCaret();
_hexBox.Invalidate();
}
_hexBox.ScrollByteIntoView();
_hexBox.ReleaseSelection();
return true;
}