Reference to WebView from C++

Adilek

Hi.

I make little application using QML and it contains WebView component.

I want to get the reference to QML object WebView from C++.

My QML is like this:
@
WebView {
id:webView
objectName: "adil1234"

        preferredWidth: flick.width
        preferredHeight: flick.height
        renderingEnabled:true
        settings.pluginsEnabled: true
        smooth: true
        contentsScale:1
        pressGrabTime:10

        focus:true
        anchors {
            left:parent.left
            right:parent.right
        }

        onUrlChanged: {
            flick.contentY = 0


        }
    }
}

@

I get the reference to this object in C++ by such method:
@
QUrl source("qrc:res/qml/qmlfile.qml");
QApplication app(argc, argv);

app.setApplicationName("salam");

QDeclarativeView view;

view.setResizeMode(QDeclarativeView::SizeRootObjectToView);
QObject::connect(view.engine(), SIGNAL(quit()), &app, SLOT(quit()));

view.setSource(source);
view.show();

QObject *object = view.rootObject();


QObject *rect = object->findChild<QObject*>("adil1234");

@

The rect is the reference to this object. It's OK but it's type is QObject. Now I need to call webkit related functions. So I write
@
QGraphicsWebView* adil = (QGraphicsWebView*)rect;
@

or

@
QWebView* adil = (QWebView*)rect;
@

When I call any function of adil for example adil->url() application crashes. I think such casting is not OK. In this situation how to get the reference of my webview component and work with it like QWebView.

Thanks.

thisisbhaskar

Always do qobject_cast when you do casting a QObject derived class.

@QObject rect = object->findChild<QObject>("adil1234");@

now I could see that url is a property of WebView and you should be able to access url property with below code

@rect->setProperty("url",QVariant("urlpath"));
QVariant urlpath = rect->property("url");
QString urlstring = urlpath.toString();
@

Try this out and let us know if this works.

Adilek

Thanks you for your attention.
For now my purpose is to get the selected text of WebView so to call rect->selectedText();. In this case rect is QObject and it's neat that it has no selectedText() method. QWebView has selectedText() method. How to get the reference of rect as QWebView (or QGraphicsWebView)?

thisisbhaskar

I doubt you can do that...

When you execute below code.. dose adil have a valid pointer ( other than zero ) ? My guess is it will be zero
@QObject rect = object->findChild<QObject>("adil1234");
QWebView* adil = qobject_cast<QWebView>(rect);@

You can not call selectedText() on WebView because WebView does not have a method with that name. Suppose if it has, you can call it with

@QMetaObject::invokeMethod(rect,"selectedText,parameters)@

djgtram

That's exactly the problem, Vijay.

I need to call back my C++ code from QML in order to set up a couple of things in the WebView (like setting the background to avoid the background transparency bug on Symbian, disabling the context menu and similar). I do it the usual way, passing the WebView id as an argument from the Component.onCompleted of the WebView in QML.

C++ accepts and tries to cast it the usual way (the way that works with many other objects, WebView seems to be the exception):

@void xxx::setup(QObject* browser) {
QWebView* webBrowser = qobject_cast<QWebView*>(browser);
qDebug() << browser;
qDebug() << webBrowser;
}@

While browser is a QDeclarativeWebView all right, it can't be cast to a QWebView, webBrowser will be a null QObject instead. Do you have any suggestion?