Popup Menu not closing after clicking custom widget

[stefanadelbert]

I have a QMenu that contains one QActionWidget. The QActionWidget contains a custom QWidget (CSpinBoxWidget), which comprises a QSpinBox and a custom QPushButton (CTitleButton).

When the CTitleButton is clicked I would like the QMenu to close.

I read here that I will most likely need to do something with the handling of mouseReleaseEvent. I decided to use a QPushButton, but I did try with a QToolButton and couldn't get it working.

When the CTitleButton is clicked, CTitleButton::mouseReleaseEvent gets called. Then the event is passed to the parent of the CTitleButton, which is the CSpinBoxWidget.

Note: I tried connecting CSpinBoxWidget::titleClicked [signal] to QActionWidget::trigger [slot], but this didn't help.

class CTitleButton : public QPushButton
{
    Q_OBJECT
 
public:
    CTitleButton(QWidget* parent = 0) : QPushButton(parent) {}
    void mouseReleaseEvent(QMouseEvent* event) {
        QPushButton::mouseReleaseEvent(event);
        QWidget::mouseReleaseEvent(event);
    }   
};
 
class CSpinBoxWidget : public QWidget
{
 
    Q_OBJECT
 
public:
    CSpinBoxWidget(const QString& t, QWidget* parent = 0) :
            QWidget(parent)
    {
        value = new QSpinBox(parent);
        value->setContextMenuPolicy(Qt::NoContextMenu);
 
        title = new CTitleButton(parent);
        title->setText(t);
 
        QHBoxLayout* hLayout = new QHBoxLayout(parent);
        hLayout->addWidget(title);
        hLayout->addWidget(value);
        hLayout->setSpacing(2);
        hLayout->setMargin(2);
        setLayout(hLayout);
 
        // When the title button is clicked
        connect(title, SIGNAL(clicked()),
            this, SIGNAL(titleClicked()));
    }
    ~CSpinBoxWidget() {}
 
public:
    int Value() { return value->value(); }
    void SetValue(int val) { value->setValue(val); }
    void SetMinimum(int min) {
        value->setMinimum(min);
    }
    void SetMaximum(int max) {
        value->setMaximum(max);    
    }
 
signals:
    void titleClicked();
 
private:
    void mouseReleaseEvent(QMouseEvent* e) {
        QWidget::mouseReleaseEvent(e);
    }
 
private:
    QSpinBox* value;
    QPushButton* title;
};

class CTitleButton : public QPushButton
{
    Q_OBJECT

public:
    CTitleButton(QWidget* parent = 0) : QPushButton(parent) {}
    void mouseReleaseEvent(QMouseEvent* event) {
        QPushButton::mouseReleaseEvent(event);
        QWidget::mouseReleaseEvent(event);
    }   
};

class CSpinBoxWidget : public QWidget
{
    
    Q_OBJECT

public:
    CSpinBoxWidget(const QString& t, QWidget* parent = 0) :
            QWidget(parent)
    {
        value = new QSpinBox(parent);
        value->setContextMenuPolicy(Qt::NoContextMenu);

        title = new CTitleButton(parent);
        title->setText(t);

        QHBoxLayout* hLayout = new QHBoxLayout(parent);
        hLayout->addWidget(title);
        hLayout->addWidget(value);
        hLayout->setSpacing(2);
        hLayout->setMargin(2);
        setLayout(hLayout);

        // When the title button is clicked
        connect(title, SIGNAL(clicked()),
            this, SIGNAL(titleClicked()));
    }
    ~CSpinBoxWidget() {}

public:
    int Value() { return value->value(); }
    void SetValue(int val) { value->setValue(val); }
    void SetMinimum(int min) {
        value->setMinimum(min);
    }
    void SetMaximum(int max) {
        value->setMaximum(max);    
    }

signals:
    void titleClicked();

private:
    void mouseReleaseEvent(QMouseEvent* e) {
        QWidget::mouseReleaseEvent(e);
    }

private:
    QSpinBox* value;
    QPushButton* title;
};

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But I don't understand how the event handling is supposed to work. When I create the QMenu, QWidgetAction and CSpinBox widget, does it matter who is whose parent as far as the event handling goes?

"QWidget::mouseReleaseEvent(event);" in CTitleButton::mouseReleaseEvent(QMouseEvent* event) ends up calling "event->ignore();", so does nothing really.

There is a documentation snippet in qwidgetaction.cpp that reads:

Note that it is up to the widget to activate the action, for example by reimplementing mouse event handlers and calling QAction::trigger().

But this doesn't make sense to me. How does the widget activate the action? Which mouseReleaseEvent functions need to be reimplemented? Who needs to call QAction::trigger (could only be derived QWidgetAction or QMenu)?

Any ideas?

Stefan