Method FoldLine

scintilla/src/Editor.cxx:7124–7158

}

void Editor::FoldLine ( int line, int action )
{
    if ( line >= 0 ) {
        if ( action == SC_FOLDACTION_TOGGLE ) {
            if ( ( pdoc->GetLevel ( line ) & SC_FOLDLEVELHEADERFLAG ) == 0 ) {
                line = pdoc->GetFoldParent ( line );
                if ( line < 0 ) {
                    return;
                }
            }
            action = ( cs.GetExpanded ( line ) ) ? SC_FOLDACTION_CONTRACT : SC_FOLDACTION_EXPAND;
        }
        if ( action == SC_FOLDACTION_CONTRACT ) {
            int lineMaxSubord = pdoc->GetLastChild ( line );
            if ( lineMaxSubord > line ) {
                cs.SetExpanded ( line, 0 );
                cs.SetVisible ( line + 1, lineMaxSubord, false );
                int lineCurrent = pdoc->LineFromPosition ( sel.MainCaret() );
                if ( lineCurrent > line && lineCurrent <= lineMaxSubord ) {
                    // This does not re-expand the fold
                    EnsureCaretVisible();
                }
            }
        } else {
            if ( ! ( cs.GetVisible ( line ) ) ) {
                EnsureLineVisible ( line, false );
                GoToLine ( line );
            }
            cs.SetExpanded ( line, 1 );
            ExpandLine ( line );
        }
        SetScrollBars();
        Redraw();
    }
}

void Editor::FoldExpand ( int line, int action, int level )
{