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+
+/*!
+ \example webkit/simpleselector
+ \title Simple Selector Example
+
+ The Simple Selector example shows how to use QWebElement to access the
+ Document Object Model (DOM) in a Web page.
+
+ \image webkit-simpleselector.png
+
+ The QWebElement class enables access to the document structure and content in a Web page,
+ as represented by a QWebFrame instance. It can be used for basic traversal of the document
+ structure (see the \l{DOM Traversal Example}), to search for particular elements, and to
+ modify any elements found.
+
+ This example uses a QWebView widget to display a Web page. A QLineEdit widget and QPushButton
+ allow the user to enter a query and highlight the results in the page. These widgets are
+ contained in an instance of the \c Window class, which we described below.
+
+ \section1 Window Class Definition
+
+ The \c Window class describes the example's user interface and this is partially described
+ by the \c window.ui file, created using \l{Qt Designer}:
+
+ \snippet examples/webkit/simpleselector/window.h Window class definition
+
+ We use \l{Using a Designer UI File in Your Application#The Multiple Inheritance Approach}
+ {multiple inheritance} to include the user interface description. We define slots that
+ will automatically respond to signals emitted by certain user interface controls.
+
+ \section1 Window Class Implementation
+
+ Since the layout of the user interface is provided by the \c{window.ui} user interface file,
+ we only need to call the \l{QWidget::}{setupUi()} in the constructor:
+
+ \snippet examples/webkit/simpleselector/window.cpp Window class constructor
+
+ This adds all the controls to the window and sets up connections between their signals
+ and suitably-named slots in the \c Window class. The QLineEdit instance was given a name of
+ \c elementLineEdit in Qt Designer, so the \c{on_elementLineEdit_returnPressed()} slot is
+ automatically connected to its \l{QLineEdit::}{returnPressed()} signal.
+
+ This slot performs the main work of this example. We begin by obtaining a QWebFrame
+ instance for the current page shown in the QWebView widget. Each QWebFrame contains
+ a QWebElement instance that represents the document, and we obtain this in order to
+ examine its contents:
+
+ \snippet examples/webkit/simpleselector/window.cpp return pressed
+
+ Taking the contents of the QLineEdit as the query text, we call the element's
+ \l{QWebElement::}{findAll()} function to obtain a list of elements that match the
+ query.
+
+ For each element obtained, we modify its style by setting its \c style attribute
+ to give it a yellow background color.
+
+ Since we also want the query to be performed when the user clicks the \gui Highlight
+ button, we also implement the \c{on_highlightButton_clicked()} slot to simply call
+ the \c{on_elementLineEdit_returnPressed()} slot when it is invoked:
+
+ \snippet examples/webkit/simpleselector/window.cpp button clicked
+
+ For completeness, we also implement a \c setUrl() function which simply passes on
+ a QUrl instance to the equivalent function in the QWebView widget:
+
+ \snippet examples/webkit/simpleselector/window.cpp set URL
+
+ \section1 Starting the Example
+
+ The main function implementation is simple. We set up the application, create
+ a \c Window instance, set its URL, and show it:
+
+ \snippet examples/webkit/simpleselector/main.cpp main program
+
+ When the application's event loop is run, the WebKit home page will load, and the
+ user can then begin to start running queries against the contents of the page.
+ The highlighting can only be removed by reloading the page. To do this, open a
+ context menu over the page and select the \gui Reload menu item.
+
+ \section1 Further Reading
+
+ The QWebElement documentation contains more information about DOM access for the
+ QtWebKit classes.
+
+ In this example, we take advantage of Qt's
+ \l{Using a Designer UI File in Your Application#Automatic Connections}{auto-connection}
+ feature to avoid explicitly connecting signals to slots.
+*/