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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/extensions/activeqt/examples/webbrowser/webbrowser.doc:1 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>A Web Browser</title>
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fn { margin-left: 1cm; text-indent: -1cm; }
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Functions</font></a>
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</td>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>A Web Browser</h1>
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This example utilizes the Microsoft Web Browser ActiveX control
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to implement a fully functional Web Browser application. The
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user interface has been developed using the TQt Designer
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integration of the <a href="qaxwidget.html">TQAxWidget</a> class.
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<p> The code demonstrates how the TQt application can communicate
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with the embedded ActiveX controls using signals, slots and the
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dynamicCall() function. Most signal and slot connections have
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already been set up within TQt Designer.
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<p>
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<pre> void MainWindow::init()
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{
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pb = new <a href="ntqprogressbar.html">TQProgressBar</a>( statusBar() );
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<a name="x2513"></a> pb-><a href="ntqprogressbar.html#setPercentageVisible">setPercentageVisible</a>( FALSE );
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<a name="x2516"></a> pb-><a href="ntqwidget.html#hide">hide</a>();
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statusBar()->addWidget( pb, 0, TRUE );
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connect( WebBrowser, TQ_SIGNAL(ProgressChange(int,int)), this, TQ_SLOT(setProgress(int,int)) );
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connect( WebBrowser, TQ_SIGNAL(StatusTextChange(const <a href="ntqstring.html">TQString</a>&)), statusBar(), TQ_SLOT(message(const <a href="ntqstring.html">TQString</a>&)) );
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WebBrowser->dynamicCall( "GoHome()" );
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}
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</pre>The init() function is implemented to create a progress bar as
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the child of the status bar, and to connect Internet Explorer's
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<tt>ProgressChange()</tt> and <tt>StatusTextChange()</tt> signals to the
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respective displays.
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<p> Finally the <tt>GoHome()</tt> function of Internet Explorer is invoked
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using the <a href="qaxbase.html#dynamicCall">TQAxBase::dynamicCall</a>() dynamicCall() API.
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<p> <pre> void MainWindow::go()
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{
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actionStop->setEnabled( TRUE );
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WebBrowser->dynamicCall( "Navigate(const <a href="ntqstring.html">TQString</a>&)", addressEdit->text() );
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}
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</pre>The go() function calls the <tt>NavigateTo()</tt> function of Internet
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Explorer, passing the text of the address bar as the argument.
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<p> <pre> void MainWindow::setTitle( const <a href="ntqstring.html">TQString</a> &title )
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{
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setCaption( "TQt WebBrowser - " + title );
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}
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</pre>The setTitle() slot is connected to the TitleChange() signal
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of Internet Explorer, and updates the caption of the window
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using the provided title string.
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<p> <pre> void MainWindow::setProgress( int a, int b )
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{
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if ( a <= 0 || b <= 0 ) {
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pb-><a href="ntqwidget.html#hide">hide</a>();
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return;
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}
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pb-><a href="ntqwidget.html#show">show</a>();
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<a name="x2515"></a> pb-><a href="ntqprogressbar.html#setTotalSteps">setTotalSteps</a>( b );
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<a name="x2514"></a> pb-><a href="ntqprogressbar.html#setProgress">setProgress</a>( a );
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}
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void MainWindow::setCommandState( int cmd, bool on )
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{
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switch ( cmd ) {
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case 1:
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actionForward->setEnabled( on );
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break;
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case 2:
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actionBack->setEnabled( on );
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break;
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}
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}
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void MainWindow::navigateBegin()
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{
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actionStop->setEnabled( TRUE );
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}
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void MainWindow::navigateComplete()
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{
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actionStop->setEnabled( FALSE );
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}
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</pre>The setProgress(), setCommandState(), navigateBegin() and
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navigateComplete() slots are connected to the respective
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signals of Internet Explorer and update the user interface.
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<p> The rest of the implementation is not related to <a href="activentqt.html#ActiveTQt">ActiveTQt</a> and
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omitted for brevity.
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<p> To build the example you must first build the
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<a href="qaxcontainer.html">TQAxContainer</a> library.
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Then run your make tool in <tt>examples/webbrowser</tt> and
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run the resulting <tt>webbrowser.exe</tt>.
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<p>See also <a href="qaxcontainer-examples.html">The TQAxContainer Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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</html>
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