Method PageMove

scintilla/src/Editor.cxx:5029–5063

* Force scroll and keep position relative to top of window. * * If stuttered = true and not already at first/last row, move to first/last row of window. * If stuttered = true and already at first/last row, scroll as normal. */

 * If stuttered = true and already at first/last row, scroll as normal.
 */
void Editor::PageMove ( int direction, Selection::selTypes selt, bool stuttered )
{
    int topLineNew;
    SelectionPosition newPos;
    int currentLine = pdoc->LineFromPosition ( sel.MainCaret() );
    int topStutterLine = topLine + caretYSlop;
    int bottomStutterLine =
        pdoc->LineFromPosition ( PositionFromLocation (
                                     Point ( lastXChosen - xOffset, direction * vs.lineHeight * LinesToScroll() ) ) )
        - caretYSlop - 1;
    if ( stuttered && ( direction < 0 && currentLine > topStutterLine ) ) {
        topLineNew = topLine;
        newPos = SPositionFromLocation ( Point ( lastXChosen - xOffset, vs.lineHeight * caretYSlop ),
                                         false, false, UserVirtualSpace() );
    } else if ( stuttered && ( direction > 0 && currentLine < bottomStutterLine ) ) {
        topLineNew = topLine;
        newPos = SPositionFromLocation ( Point ( lastXChosen - xOffset, vs.lineHeight * ( LinesToScroll() - caretYSlop ) ),
                                         false, false, UserVirtualSpace() );
    } else {
        Point pt = LocationFromPosition ( sel.MainCaret() );
        topLineNew = Platform::Clamp (
                         topLine + direction * LinesToScroll(), 0, MaxScrollPos() );
        newPos = SPositionFromLocation (
                     Point ( lastXChosen - xOffset, pt.y + direction * ( vs.lineHeight * LinesToScroll() ) ),
                     false, false, UserVirtualSpace() );
    }
    if ( topLineNew != topLine ) {
        SetTopLine ( topLineNew );
        MovePositionTo ( newPos, selt );
        Redraw();
        SetVerticalScrollPos();
    } else {
        MovePositionTo ( newPos, selt );
    }
}

void Editor::ChangeCaseOfSelection ( int caseMapping )
{