Connecting QML and C++

Ajon2733

How do you connect qml and mainwindows.cpp ?

sierdzio

Google does not bite: "LINK":http://doc.qt.nokia.com/4.7-snapshot/qtbinding.html

spode

you can in .cpp file, that derives from QWidget:
@
QDeclarativeView *view = new QDeclarativeView(this);
view->setSource("qml/NomeProgramma/qmlfile.qml");
QObject *obj = view->rootObject();
connect(obj, SIGNAL(signal_fromQML(QString, int)), this, SLOT(slot_fromCpp(QString, int)));
obj->setProperty("propertyFromQML", QVariant::fromValue("ValueThatComesFromCppFile"));
view->show();
this->show();
@

if you want to know something about lists from cpp to qml, you should have a view on qml data model!! ;)

Hornsj2

You can also set context properties and use the Q_INVOKABLE macro in your C++ Q_Object derived class.

@

   class customObject : public QObject
   {
        Q_OBJECT
        public: 
        ...constructor/destructor/assignmentOperator/copyConstructor...(standard functions you should implement)

        Q_INVOKABLE void someFunction();

        private:
        ...data
   };

//-----------------------------------------------------------
QDeclarativeView* view = newQDeclarativeView(this);
QDeclarativeContext* rootContext = view->rootContext();

   rootContext->setContextProperty("NameViewableFromQML", &customObjectInstance);

   view->setSource("Something.qml");
 
  @

Now you can do things like this in QML:

NameViewableFromQML.someFunction();