dfDropdown.calculatePopupPosition C# (CSharp) Method

    private Vector3 calculatePopupPosition( int height )
    {
        var p2u = PixelsToUnits();
        var controlPosition = this.transform.position + pivot.TransformToUpperLeft( size ) * p2u;
        var down = getScaledDirection( Vector3.down );
        var offset = transformOffset( listOffset );
        var positionBelow = controlPosition + ( offset + ( down * Size.y ) ) * p2u;
        var positionAbove = controlPosition + ( offset - ( down * popup.Size.y ) ) * p2u;

        if( listPosition == PopupListPosition.Above )
            return positionAbove;
        else if( listPosition == PopupListPosition.Below )
            return positionBelow;

        var screenSize = GetManager().GetScreenSize();

        var listBottom = GetAbsolutePosition().y + Height + height;
        if( listBottom >= screenSize.y )
            return positionAbove;

        return positionBelow;
    }