QLabel with custom word wrap mode

voltron

I need to display text (path or connection string) without whitespaces in a QLabel, something like this for example.

contextualWMSLegend=0&crs=EPSG:4326&dpiMode=7&featureCount=10&format=image/gif&tilePixelRatio=0&url=https://geo-netinfo.trafikverket.se/MapService/wms.axd/NetInfo_1_5&layers=ADT_axelpar&layers=ADT_total&layers=ADT_tungtrafik&layers=ATK_Stracka&layers=ATK_Matplats&layers=Barighet&layers=BegransadBruttovikt&layers=BegransadFordonsbredd&layers=BegransadFordonslangd&layers=BegransatAxelBoggitryck&layers=BroTunnel&layers=BrunnSlamsugning&layers=BullerskyddVag&layers=C_Rekbilvagcykeltrafik&layers=Cirkulationsplats&layers=DriftbidragStatligt&layers=Driftomrade&layers=Farjeled&layers=Farligtgods_rekvag&layers=Farthinder&layers=ForbudMotTrafik&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=&styles=

If the text gets long the widget containing label can easily go out of the screen borders. Setting wordWrap property on label does not help as labels only support wrapping on word-breaks.

My first idea was to create a QLabel subclass, override the paintEvent() method and draw text with the Qt::TextWrapAnywhere flag. Unfortunately, in this case I lost ability to render rich text and instead of nice link I get raw HTML. I was also thinking about drawing elided text instead, but this approach has the same issue with broken rich text support.

Is it possible to customize word wrap and/or elide mode without losing rich text rendering and without re-implementing most of the QLabel internals?

Christian Ehrlicher

Since QLabel accepts a subset of html you can use html for your link: "<a href=\"www.google.de\">very long long text</a>"

voltron

@Christian-Ehrlicher said in QLabel with custom word wrap mode:

Since QLabel accepts a subset of html you can use html for your link: "<a href=\"www.google.de\">very long long text</a>"

Yes, I know. But unfortunately, this does not work with overridden paintEvent(), as I wrote in the first message. The text() contains raw HTML and as I understand there is no easy way to convert it into rich text without re-implementing a lot of code from QLabel. Am I miss something?

For example, how I can get HTML rendering with this simple override?

void TestLabel::paintEvent(QPaintEvent *)
{
  QFontMetrics fm = fontMetrics();
  QString t = fm.elidedText(text(), Qt::TextElideMode::ElideRight, textRect.width(), Qt::TextFlag::TextShowMnemonic);
  QPainter painter(this);
  painter.drawText(contentsRect(), QStyle::visualAlignment(layoutDirection(), alignment()) | Qt::TextFlag::TextSingleLine, t);

Christian Ehrlicher

You have to find out by yourself. Search for href and parse it. Or since you have a custom label already - define some new functions to pass the url and use this later on. I would not override the paint event. Don't see why it would be needed.

voltron

@Christian-Ehrlicher said in QLabel with custom word wrap mode:

I would not override the paint event. Don't see why it would be needed.

Maybe I miss something, but how then I can make QLabel support wordwrap not only on word-breaks or add elided text support?