After addWidget, eventFilter suddenly doesn't work.

[John Van]

This post is deleted!

[Pl45m4]

@John-Van

So what events you want to filter?

If I'm not mistaken an event filter jumps in right before the object's QObject::event(QEvent *ev) function is called...
So you can handle any QEvent there as well

[Pl45m4]

@John-Van said in After addWidget, eventFilter suddenly doesn't work.:

this->installEventFilter(this);

What's the purpose for this line?
You usually don't set an event filter for yourself, since the widget gets all the events anyway and you could handle them in their native event handler.

m_widget = new DWidget(this);
ui.vLayout->addWidget(m_widget);
this->installEventFilter(this);

The eventFilter doesn't working，eventFilter cannot intercept any events.

What kind of events? I suspect other widgets to take the events before your filter receives them.

[John Van]

@Pl45m4
This line is only for testing catch events. I originally wanted to catch a specific event, but it always failed.

EventFilter cannot catch any kind of events.

[Pl45m4]

@John-Van

So what events you want to filter?

If I'm not mistaken an event filter jumps in right before the object's QObject::event(QEvent *ev) function is called...
So you can handle any QEvent there as well