How to display toolTip when mouse on "folded" QComboBox

  • I have a QComboBox (in QDialog) that is not large enough to display the full text of an item when it is "folded". I want to display a tooTip with the full current item text when the mouse is positioned over the QComboBox. In Qt Creator, I tried setting the toolTip property with a constant (just to try) and set mouseTracking on but that does not work. Any idea how to get that done ?

  • Qt Champions 2017

    You can subclass the combo and catch event

    bool yourcb::event(QEvent* event) {
    if (event->type() == QEvent::ToolTip) {
    QHelpEvent* helpEvent = static_cast<QHelpEvent*>(event);
    QPoint mpos = helpEvent->pos(); // might need mapToGlobal. see doc. i thinks its already translated.
    QToolTip::showText( mpos , "Pop My B. up" );

    Alternative you could use event filter
    To catch hover and then QToolTip::showText

    Disclaimer. Not tried on a combobox. Only custom widget :)

  • Hi,

    Thanks for the ideas. I'll give it a try this WE. I'll first have to read about Event Filters which I have not tried up to now.

    I was thinking that this toolTip would be sort of "integrated" in Qt Creator since there are parameters for it in the Creator's IHM.

  • Qt Champions 2017

    It is integrated and for most widgets, you just set the tooltip text and
    it will be happy.

    But as Far as I know, a closed combobox wont display tool tips pr default ,
    the way you want it.

  • OK. Make sense to not have tooltip on closed QCOMBOBOX by "default".

  • Qt Champions 2017

    Yeah, not tested when it uses its tooltip but
    i dont think it was in close state even would be smart.
    (you tested that too)

    If you have time, i suggest trying with eventfilter as such filter is also functional for many other things
    so its good pratice.

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