QListWidget set height to fit n items?

SPlatten

I'm currently setting the width using:

QString strColumns = mpobjNode->strGetAttribute(clsXMLnode::mscszAttrColumns);
if ( strColumns.isEmpty() != true ) {
    int intCharWidth = QFontMetrics(font()).maxWidth();
    int intColumns = strColumns.toInt() * intCharWidth;
    setFixedWidth(intColumns);
}

I want to set the height of the list widget to a specific number of rows, I tried:

QString strRows = mpobjNode->strGetAttribute(clsXMLnode::mscszAttrRows);
if ( strRows.isEmpty() != true ) {
    int intCharHeight = strRows.toInt() * QFontMetrics(font()).capHeight();
    setFixedHeight(intCharHeight);
}

However clearly when using just 1 row the height is to small and doesn't even contain a row properly.

What is the correct way to do this?

I've also tried this:

QString strRows = mpobjNode->strGetAttribute(clsXMLnode::mscszAttrRows);
if ( strRows.isEmpty() != true ) {
    QRect rctBounds = QFontMetrics(font()).boundingRect("X");
    int intCharHeight = strRows.toInt() * rctBounds.height();
    setFixedHeight(intCharHeight);
}

What I'm missing is the spacing above and below the text, how do I get this?

I've done it, well almost:

QMargins margins = contentsMargins();
if ( strRows.isEmpty() != true ) {
    QRect rctBounds = QFontMetrics(font()).boundingRect("X");
    int intHeight = (strRows.toInt() * rctBounds.height()) + margins.top() + margins.bottom();
    setFixedHeight(intHeight);
}

It still looks a few pixels mixing, comparing it with some LineEdit widgets which are obviously taller.

I've also tried:

QSize szHint = minimumSizeHint();
intHeight = minimumHeight();

szHint contains {74,74}
intHeight contains 0

Why did someone downvote this post? Can't you post a reason why, if whoever did that knows the answer then post it and while your at it say why you're downvoting!

The correct height seems to be:

QRect rctBounds = QFontMetrics(font()).boundingRect("X");
int intHeight = (strRows.toInt() * rctBounds.height())
                                + margins.top() + margins.bottom() + 3;
setFixedHeight(intHeight);

In the above:
strRows contains "1"
rctBounds.height() returns 15
margins.top() is 1
margins.bottom() is 1

So without the 3 fiddle factor the height is 17, adding 3 is exactly the correct height, is there a proper way to get this?