[PyQt] Show tooltip onto QLabel

Maurizio Berti maurizio.berti at gmail.com
Mon Jan 21 23:50:41 GMT 2019

I forgot...
If you don't want to display the actual QToolTip whenever it's displayed in
your label, remember to return True in the positive if statement: the event
will be considered as accepted and will not be processed further.
The same goes for the status tip, in case you are using a QMainWindow with
an active QStatusBar (which automatically catches the StatusTip events).

Il giorno mar 22 gen 2019 alle ore 00:40 Maurizio Berti <
maurizio.berti at gmail.com> ha scritto:

> Using standard tooltips might be an issue in some (not so special) cases,
> as QToolTip events are strictly related to the widget events, so you'll
> need to install an eventFilter on every single widget you'll want the
> behavior you ask about.
> A simple implementation would be something like this:
>     def __init__(self, *args, **kwargs):
>         [...]
>         self.toolTipWidget = QtWidgets.QLabel()
>         [...]
>         self.someWidget = SomeWidget()
>         self.someWidget.setToolTip('I am a tooltip!')
>         self.someWidget.installEventFilter(self)
>         [...]
>     def eventFilter(self, source, event):
>         if event.type() == QtCore.QEvent.ToolTip:
>             self.toolTipWidget.setText(source.toolTip())
>         return QtWidgets.QWidget.eventFilter(self, source, event)
> On the other hand, I'd suggest to use the StatusTip instead of the
> ToolTip: it's something I've successfully used for something similar to
> your needs: in this way you can keep the StatusTip for "simple" tooltip
> text and the ToolTips for further customized messages, as they also allow
> rich text content.
> Here's a small example:
>     def __init__(self, *args, **kwargs):
>         [...]
>         self.toolTipWidget = QtWidgets.QLabel()
>         [...]
>         self.someWidget = SomeWidget()
>         self.someWidget.setStatusTip('I am a statustip!')
>         [...]
>     def event(self, event):
>         if event.type() == QtCore.QEvent.StatusTip and event.tip():
>             self.toolTipWidget.setText(event.tip())
>         return QtWidgets.QWidget.event(self, event)
> Note that here I used the setStatusTip() method instead of the
> setToolTip() one.
> Obviously, if you're using Designer you'll set the StatusTip property from
> there, instead of the ToolTip property.
> How does it work?
> Usually the StatusTip is only used on a QMainWindow with a QStatusBar
> installed, but, interestingly enough, the event() method of *any* widget
> can be used to catch *any* StatusTip event called from both that widget
> *and* its children.
> In both cases you'd better think about a way to "clear" the tool/status
> tip, as leaving it there might be confusing.
> If you don't have too many widgets, the eventFilter way might be a good
> solution, as you can also catch the QEvent.Leave event type to hide the
> "tooltip" by clearing the label text, otherwise it's probably better using
> a QTimer on the parent widget or the label, and set it as singleShot (don't
> use the static method, as it could hide a new statustip activated in the
> meantime), then connect it to something like lambda:
> self.toolTipWidget.setText('') whenever you catch the StatusTip event.
> If for some reason you'll need to stick with ToolTips, there's a solution
> anyway.
> If all widgets already have their tooltips, and the layout is static and
> permanent once the main parent widget is being instantiated, just use the
> children() iterator and check for both isWidgetType() and toolTip()
> contents: if those condition match, install the eventFilter; if the layout
> is dynamic instead, use the childEvent method on the parent and check for
> QEvent.childAdded and QEvent.childRemoved events, then use
> installEventFilter or removeEventFilter respectively.
> Regards,
> Maurizio
> Il giorno lun 21 gen 2019 alle ore 23:22 Tong Zhang <
> warriorlance at gmail.com> ha scritto:
>> Hello,
>> Can I show the tooltip of some widget onto a QLabel? e.g. Tooltip will
>> show when I move the mouse onto the pushbutton, how about show the tooltip
>> on another widget, say label?
>> Thanks,
>> Tong
>> _______________________________________________
>> PyQt mailing list    PyQt at riverbankcomputing.com
>> https://www.riverbankcomputing.com/mailman/listinfo/pyqt
> --
> È difficile avere una convinzione precisa quando si parla delle ragioni
> del cuore. - "Sostiene Pereira", Antonio Tabucchi
> http://www.jidesk.net

È difficile avere una convinzione precisa quando si parla delle ragioni del
cuore. - "Sostiene Pereira", Antonio Tabucchi
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