QListView max number of items in view

[ArkKup]

Hi, I need to calculate max number of items in current view of QListView. I've wrote code like this:

void MyListView::resizeEvent(QResizeEvent *event)
{
    QListView::resizeEvent(event);
    qDebug()<<"QListView spacing: " <<this->spacing(); //its 0
    qDebug()<<"column: " << this->modelColumn(); //its 0
 
    QFontMetrics fm (this->font());
    int fontHeight = fm.lineSpacing();
 
    QRect cr = contentsRect();
    int windowHeight = cr.bottom() - cr.top();
 
    int maxItemsCount = windowHeight / fontHeight;
    qDebug()<<"max items in view: "<< maxItemsCount;  //incorrect :( why?
 
 
}

void MyListView::resizeEvent(QResizeEvent *event)
{
    QListView::resizeEvent(event);
    qDebug()<<"QListView spacing: " <<this->spacing(); //its 0
    qDebug()<<"column: " << this->modelColumn(); //its 0

    QFontMetrics fm (this->font());
    int fontHeight = fm.lineSpacing();

    QRect cr = contentsRect();
    int windowHeight = cr.bottom() - cr.top();

    int maxItemsCount = windowHeight / fontHeight;
    qDebug()<<"max items in view: "<< maxItemsCount;  //incorrect :( why?
    

}

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but calculated max number of items is is incorrect. E.g. in case of my window height and font height I get 32 items when in fact current view has 28 items max. Perhaps someone can suggest something, how to calculate it properly?