googlechat.cpp Example File
webkit/googlechat/googlechat.cpp

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 #include <QtGui>
 #include <QtWebKit>

 #include "googlechat.h"

 #define GOOGLECHAT_URL "http://talkgadget.google.com/talkgadget/m"

 GoogleChat::GoogleChat(): QWidget() {
     form.setupUi(this);
     setFixedSize(320, 480);

     form.userNameEdit->setFocus();
     connect(form.userNameEdit, SIGNAL(textChanged(QString)), SLOT(adjustLoginButton()));
     connect(form.userNameEdit, SIGNAL(returnPressed()), SLOT(inputPassword()));

     connect(form.passwordEdit, SIGNAL(textChanged(QString)), SLOT(adjustLoginButton()));
     connect(form.passwordEdit, SIGNAL(returnPressed()), SLOT(doLogin()));

     form.loginButton->setEnabled(false);
     connect(form.loginButton, SIGNAL(clicked()), SLOT(doLogin()));

     connect(form.webView, SIGNAL(loadFinished(bool)), SLOT(initialPage(bool)));
     connect(form.webView, SIGNAL(loadProgress(int)),
             form.progressBar, SLOT(setValue(int)));
     form.webView->setUrl((QUrl(GOOGLECHAT_URL)));
     form.webView->setContextMenuPolicy(Qt::PreventContextMenu);

     showStatus("Wait...");
 }

 void GoogleChat::showStatus(const QString &msg) {
     form.statusLabel->setText(msg);
     form.stackedWidget->setCurrentIndex(0);
 }

 void GoogleChat::showError(const QString &msg) {
     form.progressBar->hide();
     showStatus(QString("Error: %1").arg(msg));
 }

 QString GoogleChat::evalJS(const QString &js) {
     QWebFrame *frame = form.webView->page()->mainFrame();
     return frame->evaluateJavaScript(js).toString();
 }

 void GoogleChat::adjustLoginButton() {
     userName = form.userNameEdit->text();
     password = form.passwordEdit->text();
     bool ok = !userName.isEmpty() && !password.isEmpty();
     form.loginButton->setEnabled(ok);
 }

 void GoogleChat::inputPassword() {
     if (!form.userNameEdit->text().isEmpty())
         form.passwordEdit->setFocus();
 }

 void GoogleChat::doLogin() {
     userName = form.userNameEdit->text();
     password = form.passwordEdit->text();
     bool ok = !userName.isEmpty() && !password.isEmpty();
     if (!ok)
         return;

     form.progressBar->setValue(0);
     form.progressBar->show();
     connect(form.webView, SIGNAL(loadFinished(bool)), SLOT(loginPage(bool)));
     connect(form.webView, SIGNAL(loadProgress(int)),
             form.progressBar, SLOT(setValue(int)));
     showStatus("Logging in...");

     QString userEmail = userName + "@gmail.com";
     evalJS(QString("document.getElementById('Email').value = \"%1\";").arg(userEmail));
     evalJS(QString("document.getElementById('Passwd').value = \"%1\";").arg(password));
     evalJS("document.getElementById('gaia_loginform').submit();");
 }

 void GoogleChat::initialPage(bool ok) {
     if (ok) {
         QString s1 = evalJS("document.getElementById('Email').name");
         QString s2 = evalJS("document.getElementById('Passwd').name");
         QString s3 = evalJS("document.getElementById('gaia_loginform').id");
         if (s1 == "Email" && s2 == "Passwd" && s3 == "gaia_loginform") {
             form.stackedWidget->setCurrentIndex(1);
             form.webView->disconnect();
             return;
         }
     }

     showError("SERVICE unavailable.");
 }

 void GoogleChat::hideElements()
 {
     evalJS("var e = document.getElementsByClassName('footer-footer')[0]; e.parentElement.removeChild(e)");
     evalJS("var e = document.getElementsByClassName('title-bar-bg title-bar')[0]; e.parentElement.removeChild(e)");
     QTimer::singleShot(2000, this, SLOT(hideElements()));
 }

 void GoogleChat::loginPage(bool ok) {
     QString location = form.webView->url().toString();
     if (!ok) {
         if (location.indexOf("CheckCookie"))
             return;
         showError("Service unavailable");
     } else {
         // check for any error message
         QString c = evalJS("document.getElementsByClassName('errormsg').length");
         if (c == "0") {
             form.stackedWidget->setCurrentIndex(2);
             QTimer::singleShot(500, this, SLOT(hideElements()));
             return;
         }

         QString err = "Unknown login failure.";
         if (c == "1") {
             err = evalJS("document.getElementsByClassName('errormsg')[0].textContent");
             err = err.simplified();
         }
         showError(err);
     }
 }