QTabWidget::event() override is never called

[mayaknife]

I've subclassed QTabWidget and provided overrides for the event(QEvent*) and mousePressEvent(QMouseEvent*) virtuals, but they are never called.

I know that I can install an event filter to handle those events, but why don't the overrides work?

Here's my class declaration:

class ViewTabs : public QTabWidget
{
    Q_OBJECT

public:
    ViewTabs(QWidget *parent=NULL);
    virtual ~ViewTabs();

    virtual bool event(QEvent *e);
    virtual void mousePressEvent(QMouseEvent *event);
};

and the implementation:

ViewTabs::ViewTabs(QWidget *parent)
:   QTabWidget(parent)
{
}

ViewTabs::~ViewTabs()
{
}

bool
ViewTabs::event(QEvent *e)
{
    std::cout << "ViewTabs::event() event" << std::endl;

    return QTabWidget::event(e);
}


void
ViewTabs::mousePressEvent(QMouseEvent *event)
{
    Q_UNUSED(event);

    std::cout << "ViewTabs press" << std::endl;
}

EDIT: The overrides are indeed being called correctly. I had assumed they weren't because print statements placed in them were not appearing on the console. That was because I didn't have the 'console' setting in my CONFIG.

[joeQ]

@mayaknife hi, friend, welcome

I tried my Qt and to write test, it can grab mouse click event in subclass QTabWidget

my snippet code:

head file

#ifndef TABWIDGET_H
#define TABWIDGET_H
#include <QTabWidget>

class TabWidget : public QTabWidget
{
public:
    TabWidget(QWidget* parent = 0);

protected:
    void mousePressEvent(QMouseEvent *event) override;
};

#endif // TABWIDGET_H

cpp file

#include "tabwidget.h"
#include <QtCore/QDebug>

TabWidget::TabWidget(QWidget *parent)
    :QTabWidget(parent)
{

}

void TabWidget::mousePressEvent(QMouseEvent *event)
{
    QTabWidget::mousePressEvent(event);
    qDebug(".....");
}

[mrjj]

Hi

I can highly recommend to use c++11 keyword override

virtual bool event(QEvent *event) override;

as compiler will then tell you if it overrides nothing and u know something is wrong.

Also to be sure signature ( return type and parameters) is correct, one
can use the menu to insert base class overrides.

Right click the class definition ( on the name ) and go to Refactor menu

then you get nice list

[joeQ]

@mrjj

Using such a long Qt IDE, have not found this method. Best way to insert virtual function. Thank you very much.

[mrjj]

@joeQ
Well i have been surprised a few times finding a feature that really rocks.
Like
When you add a parameter function and it shows that little lamp in the end.
Press alt+enter to let it change/add the parameter to other file. (.h or .cpp) by itself.

In Designer , you can actually drag a widget BACK to the widget list and use it as a template for a given
widget type. So you don't have to set the properties all over. Composite/complex objects also works

The Refactor right click menu is context sensitive and offer different
menus depending on the text cursor location.
Like standing on a member variable , it offers to create get/set function for it.

(alt + enter also works)

and few other little surprises :)

[joeQ]

@mrjj
so surprised, these ways are very convenient and efficient. thank you very much.