Method updateScrollbar

launcher/ui/instanceview/InstanceView.cpp:145–180

}

void InstanceView::updateScrollbar()
{
    int previousScroll = verticalScrollBar()->value();
    if (m_groups.isEmpty())
    {
        verticalScrollBar()->setRange(0, 0);
    }
    else
    {
        int totalHeight = 0;
        // top margin
        totalHeight += m_categoryMargin;
        int itemScroll = 0;
        for (auto category : m_groups)
        {
            category->m_verticalPosition = totalHeight;
            totalHeight += category->totalHeight() + m_categoryMargin;
            if(!itemScroll && category->totalHeight() != 0)
            {
                itemScroll = category->contentHeight() / category->numRows();
            }
        }
        // do not divide by zero
        if(itemScroll == 0)
            itemScroll = 64;

        totalHeight += m_bottomMargin;
        verticalScrollBar()->setSingleStep ( itemScroll );
        const int rowsPerPage = qMax ( viewport()->height() / itemScroll, 1 );
        verticalScrollBar()->setPageStep ( rowsPerPage * itemScroll );

        verticalScrollBar()->setRange(0, totalHeight - height());
    }

    verticalScrollBar()->setValue(qMin(previousScroll, verticalScrollBar()->maximum()));
}

void InstanceView::updateGeometries()
{