如何重置QML WebView？

Question

Looks. Here is the simplest code: https://www.dropbox.com/s/ctdcgrk0eqgq3a3/webview_test.tar.gz

When you start this app you will see white window. Click on window and you will see browser with Twitter. Click again and browser will be hide and destroyed.

So, please login to Twitter, than destroy browser by clicking first window and then create it again by clicking on first window. You will see that you left signed in. But I need that browser every time opens without signed user (even if user checked "Remember me" checkbox). How to do this? How to reset browser to the initial state?

Here is main parts of project:

main.cpp

#include <QApplication>
#include <QQuickView>

#include "container.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    Container c;
    c.start();

    return a.exec();
}

container.cpp

#include "container.h"

#include <QDebug>
#include <QQuickItem>
#include <QQmlContext>

Container::Container(QObject *parent) :
    QObject(parent)
{
    mainFile = new QQuickView();

    browserExists = false;
}

Container::~Container()
{
    delete mainFile;
}

void Container::start()
{
    mainFile->setSource(QUrl("qrc:/main.qml"));

    connect(mainFile->rootObject(), SIGNAL(click()), this, SLOT(mainFileClicked()));

    mainFile->show();
}

void Container::mainFileClicked()
{
    if(!browserExists)
    {
        browser = new QQuickView();
        browser->setSource(QUrl("qrc:/browser.qml"));
        browser->rootContext()->setContextProperty("address", "http://twitter.com");

        browser->show();

        browserExists = true;
    }
    else
    {
        browser->hide();
        delete browser;

        browserExists = false;
    }
}

main.qml

import QtQuick 2.0

Rectangle {
    width: 320
    height: 240

    signal click();

    MouseArea {
        anchors.fill: parent

        onClicked:
        {
            click()
        }
    }
}

browser.qml

import QtQuick 2.0
import QtWebKit 3.0
import QtWebKit.experimental 1.0

Item {
    width: 640
    height: 480

    signal closeWindow();

    WebView
    {
        anchors.fill: parent
        url: address
        experimental.preferences.privateBrowsingEnabled: true
    }
}

Answer 1

I think, that this answer is not necessary now, but I have the same problem with embeded QML WebView in my Sailfish application. Private browsing still doesn't work, so I have found dirty hack: remove cache from fs. In sailfish it stores in ~/.local/share/app-name/.QtWebKit. So, this dirty solution gives me possibility to use one webview with fresh state each time.