Qt 5.0: Combining QML code in a QMainWindow-derived main window

danielbsig

Hi,

what is the preferred method of having a QMainWindow application window, but the UI in QML? I would really like to use the new MediaPlayer and the VideoSurface elements in QtQuick 2.0, I'm assuming I can't host such a qml file in a QDeclarativeView-based environment?

Any pointers whatsoever would be highly appreciated.

Regards,
Daniel

Babalas

I ended up finding a class (somewhere) called QWindowContainer. Looks like this:

QWindowContainer.h
@class QWindowContainerPrivate;

class Q_WIDGETS_EXPORT QWindowContainer : public QWidget
{
Q_OBJECT
Q_DECLARE_PRIVATE(QWindowContainer)

public:
explicit QWindowContainer(QWidget *parent = 0, Qt::WindowFlags f = 0);
~QWindowContainer();

void setWindow(QWindow *window);
QWindow *window() const;

protected:
bool event(QEvent *ev);
};@

QWindowContainer.cpp
@class QWindowContainerPrivate : public QWidgetPrivate
{
public:
Q_DECLARE_PUBLIC(QWindowContainer)

QWindowContainerPrivate() : window(0) { }
~QWindowContainerPrivate() { }

QWindow *window;

};

QWindowContainer::QWindowContainer(QWidget *parent, Qt::WindowFlags flags)
: QWidget(*new QWindowContainerPrivate, parent, flags)
{
}

QWindowContainer::~QWindowContainer()
{
}

void QWindowContainer::setWindow(QWindow *window)
{
Q_D(QWindowContainer);

Q_ASSERT(window && !d->window);
QWidget *tlw = QWidget::window();
tlw->winId(); // make sure the tlw has a platform window
window->setParent(tlw->windowHandle());
window->setGeometry(geometry());
d->window = window;

}

QWindow *QWindowContainer::window() const
{
Q_D(const QWindowContainer);
return d->window;
}

bool QWindowContainer::event(QEvent *e)
{
Q_D(QWindowContainer);
if (!d->window)
return QWidget::event(e);

QEvent::Type type = e->type();
switch (type) {
case QEvent::Show:
    d->window->show();
    break;
case QEvent::Hide:
    d->window->hide();
    break;
case QEvent::Move: {
    QMoveEvent *me = static_cast<QMoveEvent *>(e);
    d->window->setPosition(me->pos());
}
    break;
case QEvent::Resize: {
    QResizeEvent *re = static_cast<QResizeEvent *>(e);
    d->window->resize(re->size());
    break;
}
default:
    break;
}

return QWidget::event(e);

}@

Then you have some code that looks like
@QMainWindow window;
QQuickView* view = new QQuickView;
QWindowContainer* container = new QWindowContainer;
container->setWindow(view);
window.setCentralWidget(container);@

It has issues though. At the moment I can not get QAction global shortcuts to work if the focus is on QQuickView.

Jens

It is probably this one: https://codereview.qt-project.org/#change,41539
Please let us know if you find other issues with it. The plan is to include it or something similar with 5.1

Babalas

That's the one. Discovered today that shortcuts for QAction don't work when the focus is on the QQuickItem. I have raised a question about it in another post.

ronghester

Hi There,

I am trying to integrate this class in my program on window machine and getting link errors. Link errors are given below. Also I am unable to include qwidget_p.h file.

Any clue??

mainwindow.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall QWindowContainer::setWindow(class QWindow *)" (_imp?setWindow@QWindowContainer@@QAEXPAVQWindow@@@Z) referenced in function "public: __thiscall MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QAE@PAVQWidget@@@Z)
mainwindow.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall QWindowContainer::QWindowContainer(class QWidget *,class QFlags<enum Qt::WindowType>)" (_imp??0QWindowContainer@@QAE@PAVQWidget@@V?$QFlags@W4WindowType@Qt@@@@@Z) referenced in function "public: __thiscall MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QAE@PAVQWidget@@@Z)
mainwindow.obj : error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __thiscall QWindowContainer::metaObject(void)const " (?metaObject@QWindowContainer@@UBEPBUQMetaObject@@XZ)
mainwindow.obj : error LNK2001: unresolved external symbol "public: virtual void * __thiscall QWindowContainer::qt_metacast(char const *)" (?qt_metacast@QWindowContainer@@UAEPAXPBD@Z)
mainwindow.obj : error LNK2001: unresolved external symbol "public: virtual int __thiscall QWindowContainer::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@QWindowContainer@@UAEHW4Call@QMetaObject@@HPAPAX@Z)
mainwindow.obj : error LNK2001: unresolved external symbol "protected: virtual bool __thiscall QWindowContainer::event(class QEvent *)" (?event@QWindowContainer@@MAE_NPAVQEvent@@@Z)
mainwindow.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall QWindowContainer::~QWindowContainer(void)" (_imp??1QWindowContainer@@UAE@XZ) referenced in function "public: virtual void * __thiscall QWindowContainer::`scalar deleting destructor'(unsigned int)" (??_GQWindowContainer@@UAEPAXI@Z)

Babalas

In cmake I have this
@INCLUDE_DIRECTORIES(
${Qt5Widgets_PRIVATE_INCLUDE_DIRS}
)

QT5_USE_MODULES(Gui Widgets OpenGL Xml Quick)
@

ronghester

I am building this using QTCreator (2.6.1) and not sure what is equivalent of $Qt5Widgets_PRIVATE_INCLUDE_DIRS

I search but could not found this as a system variable. I guess I have to find out proper file in mkspecs?
any help?

I am also afraid : https://bugreports.qt-project.org/browse/QTBUG-26869

Babalas

I think it is just
@
QT += widget widget-private
@

ronghester

No Same errors.