protected virtual bool PreProcessWmKeyDown_ShiftUp(ref Message m)
{
long pos = _hexBox._bytePos;
long sel = _hexBox._selectionLength;
if (pos - _hexBox._iHexMaxHBytes < 0 && pos <= _bpiStart.Index)
return true;
if (_bpiStart.Index >= pos + sel)
{
pos = pos - _hexBox._iHexMaxHBytes;
sel += _hexBox._iHexMaxHBytes;
_hexBox.InternalSelect(pos, sel);
_hexBox.ScrollByteIntoView();
}
else
{
sel -= _hexBox._iHexMaxHBytes;
if (sel < 0)
{
pos = _bpiStart.Index + sel;
sel = -sel;
_hexBox.InternalSelect(pos, sel);
_hexBox.ScrollByteIntoView();
}
else
{
sel -= _hexBox._iHexMaxHBytes;
_hexBox.InternalSelect(pos, sel);
_hexBox.ScrollByteIntoView(pos + sel);
}
}
return true;
}