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It implements a number of slots to perform actions on both the application and on the web content. \snippet examples/webkit/fancybrowser/mainwindow.h 1 We also declare a QString that contains the jQuery, a QWebView that displays the web content, and a QLineEdit that acts as the address bar. \section1 MainWindow Class Implementation We start by implementing the constructor. \snippet examples/webkit/fancybrowser/mainwindow.cpp 1 The first part of the constructor sets the value of \c progress to 0. This value will be used later in the code to visualize the loading of a webpage. Next, the jQuery library is loaded using a QFile and reading the file content. The jQuery library is a JavaScript library that provides different functions for manipulating HTML. \snippet examples/webkit/fancybrowser/mainwindow.cpp 2 The second part of the constructor creates a QWebView and connects slots to the views signals. Furthermore, we create a QLineEdit as the browsers address bar. We then set the horizontal QSizePolicy to fill the available area in the browser at all times. We add the QLineEdit to a QToolbar together with a set of navigation actions from QWebView::pageAction. \snippet examples/webkit/fancybrowser/mainwindow.cpp 3 The third and last part of the constructor implements two QMenus and assigns a set of actions to them. The last line sets the QWebView as the central widget in the QMainWindow. \snippet examples/webkit/fancybrowser/mainwindow.cpp 4 When the page is loaded, \c adjustLocation() updates the address bar; \c adjustLocation() is triggered by the \c loadFinished() signal in QWebView. In \c changeLocation() we create a QUrl object, and then use it to load the page into the QWebView. When the new web page has finished loading, \c adjustLocation() will be run once more to update the address bar. \snippet examples/webkit/fancybrowser/mainwindow.cpp 5 \c adjustTitle() sets the window title and displays the loading progress. This slot is triggered by the \c titleChanged() signal in QWebView. \snippet examples/webkit/fancybrowser/mainwindow.cpp 6 When a web page has loaded, \c finishLoading() is triggered by the \c loadFinished() signal in QWebView. \c finishLoading() then updates the progress in the title bar and calls \c evaluateJavaScript() to evaluate the jQuery library. This evaluates the JavaScript against the current web page. What that means is that the JavaScript can be viewed as part of the content loaded into the QWebView, and therefore needs to be loaded every time a new page is loaded. Once the jQuery library is loaded, we can start executing the different jQuery functions in the browser. \snippet examples/webkit/fancybrowser/mainwindow.cpp 7 The first jQuery-based function, \c highlightAllLinks(), is designed to highlight all links in the current webpage. The JavaScript code looks for web elements named \e {a}, which is the tag for a hyperlink. For each such element, the background color is set to be yellow by using CSS. \snippet examples/webkit/fancybrowser/mainwindow.cpp 8 The \c rotateImages() function rotates the images on the current web page. Webkit supports CSS transforms and this JavaScript code looks up all \e {img} elements and rotates the images 180 degrees and then back again. \snippet examples/webkit/fancybrowser/mainwindow.cpp 9 The remaining four methods remove different elements from the current web page. \c removeGifImages() removes all Gif images on the page by looking up the \e {src} attribute of all the elements on the web page. Any element with a \e {gif} file as its source is removed. \c removeInlineFrames() removes all \e {iframe} or inline elements. \c removeObjectElements() removes all \e {object} elements, and \c removeEmbeddedElements() removes any elements such as plugins embedded on the page using the \e {embed} tag. */