I'd like to use an ApplicationWindow
as a main file and be able to switch to other QML
files from C++
with QQuickView::setSource(const QUrl & url)
. Basically it would do this:
start-up => loads main.qml (ApplicationWindow
) => click on help button => C++
loads help.qml file => etc.
int main(int argc, char *argv[])
{
QApplication app{argc, argv};
CustomQQuickView view;
view.setSource(QUrl{"qrc:/main.qml"});
view->show();
return app.exec();
}
main.qml
ApplicationWindow
{
visible: true
width: 640
height: 480
Loader
{
anchors.fill: parent
id: mainPageLoader
}
Button
{
text: "Help"
onClicked: { mainPageLoader.source = "help.qml"}
}
}
(I am wondering if the Loader
here is really necessary here)
However QQuickView
only supports loading of root objects that derive from QQuickItem
. Therefore it doesn't work with ApplicationWindow
.
I'm thinking about using QQmlApplicationEngine
instead of QQuickView
but the usage seems different, this class being only equipped with QQmlApplicationEngine::load(const QUrl & url)
What would be the best course of action for my purpose? Do I really need an ApplicationWindow
in my main.qml file?
Use QQmlApplicationEngine
as you suggest, and with the main.qml
as you say, but set a context property from C++ with the content page URL, e.g. help.qml
- then bind to this context property in the Loader's source property.
This is the normal way of controlling QML from C++ - expose context properties or singleton objects with properties, drive them from C++, and have QML bindings respond to changes.