Segmentation fault on QMenu::exec

Daniil Kolesnichenko

I'm trying to implement custom context menu for my widget that inherits QWebView.

Here is widget's header (I'm omitting #include's):

class BrowserView : public QWebView
{
    Q_OBJECT
public:
    BrowserView(QWidget *parent);

public slots:
    void showContextMenu(const QPoint &);
};

And here is the source:

BrowserView::BrowserView(QWidget *parent) : QWebView(parent)
{
    setContextMenuPolicy(Qt::CustomContextMenu);
    connect(this, SIGNAL(customContextMenuRequested(QPoint)), this,
            SLOT(showContextMenu(const QPoint &)));
}

void BrowserView::showContextMenu(const QPoint &p)
{
    QPoint globalPos = mapToGlobal(p);

    QMenu menu(this);
    menu.addAction("Menu item 1");

    QAction *selectedItem = menu.exec(globalPos);

    if (selectedItem) {
        qDebug() << "item was selected";
    } else {
        qDebug() << "item was not selected";
    }
}

Here is my layout:

<ui version="4.0">
    <class>MainWindow</class>
    <widget class="QMainWindow" name="MainWindow">
        <property name="geometry">
            <rect>
                <x>0</x>
                <y>0</y>
                <width>400</width>
                <height>300</height>
            </rect>
        </property>
        <property name="windowTitle">
            <string>MainWindow</string>
        </property>
        <widget class="BrowserView">
            <property name="objectName">
                <string>browserView</string>
            </property>
        </widget>
    </widget>

    <layoutDefault spacing="6" margin="11" />
    <pixmapfunction></pixmapfunction>
    <resources/>
    <connections/>
</ui>

When I click right mouse button, the application crashes with segmentation fault. I found out that segfault happens when menu.exec(globalPos) is called. I tried to rewrite it using DefaultContextMenu (onContextMenuEvent), but the result is the same.

Daniil Kolesnichenko

@dheerendra oh, I found where was the problem, and it wasn't actually related to context menus. I use my own BrowserApp class that inherits QApplication but I found out that I inherited it the wrong way (constructor signature was wrong) and that caused some segfaults, including the one described in my question. So now I fixed that and everything works fine.

dheerendra

I don't see any issue with the code. Did you try whether your code works with QMainWindow type ? i.e Use the above logic in QMainWIndow class and try context menu works.

jsulm

@Daniil-Kolesnichenko Did you try to debug to see at which line exactly it is crashing?

Daniil Kolesnichenko

@dheerendra oh, I found where was the problem, and it wasn't actually related to context menus. I use my own BrowserApp class that inherits QApplication but I found out that I inherited it the wrong way (constructor signature was wrong) and that caused some segfaults, including the one described in my question. So now I fixed that and everything works fine.