Qt 4: How to insert QAction in menu of mainwindow - c++

Question

My problem is to get the QAction of custom widget from the outside and insert in menu of mainwindow. There is QActionWidget but it inserts custom widget in menu.
class QDESIGNER_WIDGET_EXPORT Photo_list: public QWidget
{
Q_OBJECT
public:
Photo_list(QWidget* parent = 0);
~Photo_list();
int count();
QString returnImagePath(const int i);
void sendSignalImageLoaded();
public slots:
void addImagePath();
void deleteImagePath();
signals:
void imageLoaded(int count);
//private:
public:
Ui::Photo_list *m_photo_list_ui;
QStringList m_image_path_list;
};
class Ui_Photo_list
{
public:
QAction *addImageAction;
QAction *deleteImageAction;
QGridLayout *gridLayout;
QListWidget *listWidget;
void setupUi(QWidget *Photo_list)
{
if (Photo_list->objectName().isEmpty())
Photo_list->setObjectName(QString::fromUtf8("Photo_list"));
Photo_list->resize(274, 210);
addImageAction = new QAction(Photo_list);
addImageAction->setObjectName(QString::fromUtf8("addImageAction"));
deleteImageAction = new QAction(Photo_list);
deleteImageAction->setObjectName(QString::fromUtf8("deleteImageAction"));
gridLayout = new QGridLayout(Photo_list);
gridLayout->setContentsMargins(0, 0, 0, 0);
gridLayout->setObjectName(QString::fromUtf8("gridLayout"));
gridLayout->setHorizontalSpacing(0);
listWidget = new QListWidget(Photo_list);
listWidget->setObjectName(QString::fromUtf8("listWidget"));
listWidget->setTextElideMode(Qt::ElideMiddle);
listWidget->setMovement(QListView::Static);
listWidget->setResizeMode(QListView::Adjust);
listWidget->setViewMode(QListView::IconMode);
gridLayout->addWidget(listWidget, 0, 0, 1, 1);
retranslateUi(Photo_list);
QMetaObject::connectSlotsByName(Photo_list);
} ...
How to add QAction *addImageAction in ( * )? (see comment below)
class Ui_Cpdfa
{
public:
QAction *createPdfAction;
QWidget *centralwidget;
QGridLayout *gridLayout_2;
QGridLayout *gridLayout;
QLineEdit *pdfPathLineEdit;
QPushButton *findPdfPathButton;
Photo_list *photo_list;
QToolBar *toolBar;
QMenuBar *menuBar;
QMenu *menu;
QMenu *menu_2;
void setupUi(QMainWindow *Cpdfa)
{
if (Cpdfa->objectName().isEmpty())
Cpdfa->setObjectName(QString::fromUtf8("Cpdfa"));
Cpdfa->resize(386, 303);
createPdfAction = new QAction(Cpdfa);
createPdfAction->setObjectName(QString::fromUtf8("createPdfAction"));
centralwidget = new QWidget(Cpdfa);
centralwidget->setObjectName(QString::fromUtf8("centralwidget"));
gridLayout_2 = new QGridLayout(centralwidget);
gridLayout_2->setObjectName(QString::fromUtf8("gridLayout_2"));
gridLayout = new QGridLayout();
gridLayout->setObjectName(QString::fromUtf8("gridLayout"));
pdfPathLineEdit = new QLineEdit(centralwidget);
pdfPathLineEdit->setObjectName(QString::fromUtf8("pdfPathLineEdit"));
gridLayout->addWidget(pdfPathLineEdit, 0, 0, 1, 1);
findPdfPathButton = new QPushButton(centralwidget);
findPdfPathButton->setObjectName(QString::fromUtf8("findPdfPathButton"));
gridLayout->addWidget(findPdfPathButton, 0, 1, 1, 1);
photo_list = new Photo_list(centralwidget);
photo_list->setObjectName(QString::fromUtf8("photo_list"));
gridLayout->addWidget(photo_list, 1, 0, 1, 2);
gridLayout_2->addLayout(gridLayout, 0, 0, 1, 1);
Cpdfa->setCentralWidget(centralwidget);
toolBar = new QToolBar(Cpdfa);
toolBar->setObjectName(QString::fromUtf8("toolBar"));
Cpdfa->addToolBar(Qt::TopToolBarArea, toolBar);
menuBar = new QMenuBar(Cpdfa);
menuBar->setObjectName(QString::fromUtf8("menuBar"));
menuBar->setGeometry(QRect(0, 0, 386, 21));
menu = new QMenu(menuBar);
menu->setObjectName(QString::fromUtf8("menu"));
menu_2 = new QMenu(menuBar);
menu_2->setObjectName(QString::fromUtf8("menu_2"));
Cpdfa->setMenuBar(menuBar);
toolBar->addAction(createPdfAction); //!!(*)
toolBar->addSeparator();
menuBar->addAction(menu->menuAction());
menuBar->addAction(menu_2->menuAction());
menu->addSeparator();
menu_2->addAction(createPdfAction); //!!(*)
retranslateUi(Cpdfa);
QMetaObject::connectSlotsByName(Cpdfa);
} // setupUi

Answer 1

I guess you are using Qt creator and designing forms separately with the form editor.
Your problem is acutally that you want the class A(a "larger" widget which comprises the subobjects) to access members in the namespace of its subobject B(your photo_list widget).
To do this,
Move the inclusion "ui_B.h" from B.cpp to B.h
Inside B.h make the private memeber Ui::B *ui; public (or you can have A and B become friends)
After including "B.h" and having a subobject pointer *B, you can call B->ui->actionXXX in A to access all memebers of B, since B->ui points to the namespace that includes all memebers created from B.ui file (which turn out to be inside "ui_B.h")