intercept and ignore a wheel event in a QTabWidget

Question

I implement a UI with Qt. My UI is a mainwindow containing some widgets, and a supervisor to manage my widget behaviors. In one of my widget, outputDataWidget, I have a QTabWidget, and some other widgets.

In my tabWidget, I have a dataEditor to show points, and I create a "+" tab, to create a new tab. The tab creation is done by a connect function, which is in the mainwindow:

connect(outputWidget.get(), SIGNAL(SIG_createNewOutput(int)), projectSupervisor.get(), SLOT(sCreateNewOutput(int)));

My problem is: when we use the wheel mouse button in the tab header to go rigth, some new page are created. I would like intercept the signal and avoid the creation of a new tab. I try to add a filter event in the mainwindow and in the outputdatawidget to ignore the wheel event. Then I try to reimplemeted wheelEvent(QWheelEvent* we) and event(QEvent *e) of the QTabWidget. Each time, we enter in thiese modification after call the connect (create the tab). Have you an idea how to call the event before the connect, or how I can disable the wheelevent of a QTabWidget? Thanks

Why creating a "+" tab? Having a button to do that may be better, no? — Boiethios, Jun 29 '16 at 07:46
@Boiethios is right, check http://stackoverflow.com/a/27127109/6385043 for that (Qt 5 preferred). — maxik, Jun 29 '16 at 07:49

score 3 · Accepted Answer · answered Jun 29 '16 at 08:41

3

You'll have to subclass QTabBar to handle the QWheelEvent, then call QTabWidget::setTabBar during initialization.

This is necessary because QTabWidget internally uses a QTabBar with Qt::WheelFocus, so the wheel event never propagates to the tab widget.

answered Jun 29 '16 at 08:41

jonspaceharper

4,207
2
22
42

intercept and ignore a wheel event in a QTabWidget

1 Answers1