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| 2 | <!-- /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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| 3 | <html>
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| 4 | <head>
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| 5 | <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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| 6 | <title>A Web Browser</title>
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| 7 | <style type="text/css"><!--
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| 8 | fn { margin-left: 1cm; text-indent: -1cm; }
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| 9 | a:link { color: #004faf; text-decoration: none }
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| 10 | a:visited { color: #672967; text-decoration: none }
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| 11 | body { background: #ffffff; color: black; }
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| 12 | --></style>
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| 13 | </head>
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| 14 | <body>
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| 15 |
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| 16 | <table border="0" cellpadding="0" cellspacing="0" width="100%">
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| 17 | <tr bgcolor="#E5E5E5">
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| 18 | <td valign=center>
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| 19 | <a href="index.html">
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| 20 | <font color="#004faf">Home</font></a>
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| 21 | | <a href="classes.html">
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| 22 | <font color="#004faf">All Classes</font></a>
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| 23 | | <a href="mainclasses.html">
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| 24 | <font color="#004faf">Main Classes</font></a>
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| 25 | | <a href="annotated.html">
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| 26 | <font color="#004faf">Annotated</font></a>
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| 27 | | <a href="groups.html">
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| 28 | <font color="#004faf">Grouped Classes</font></a>
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| 29 | | <a href="functions.html">
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| 30 | <font color="#004faf">Functions</font></a>
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| 31 | </td>
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| 32 | <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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| 33 |
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| 34 |
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| 35 |
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| 36 | This example utilizes the Microsoft Web Browser ActiveX control
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| 37 | to implement a fully functional Web Browser application. The
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| 38 | user interface has been developed using the Qt Designer
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| 39 | integration of the <a href="qaxwidget.html">QAxWidget</a> class.
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| 40 | <p> The code demonstrates how the Qt application can communicate
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| 41 | with the embedded ActiveX controls using signals, slots and the
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| 42 | dynamicCall() function. Most signal and slot connections have
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| 43 | already been set up within Qt Designer.
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| 44 | <p>
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| 45 |
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| 46 | <pre> void MainWindow::init()
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| 47 | {
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| 48 | pb = new <a href="qprogressbar.html">QProgressBar</a>( statusBar() );
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| 49 | <a name="x2513"></a> pb-><a href="qprogressbar.html#setPercentageVisible">setPercentageVisible</a>( FALSE );
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| 50 | <a name="x2516"></a> pb-><a href="qwidget.html#hide">hide</a>();
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| 51 | statusBar()->addWidget( pb, 0, TRUE );
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| 52 |
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| 53 | connect( WebBrowser, SIGNAL(ProgressChange(int,int)), this, SLOT(setProgress(int,int)) );
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| 54 | connect( WebBrowser, SIGNAL(StatusTextChange(const <a href="qstring.html">QString</a>&)), statusBar(), SLOT(message(const <a href="qstring.html">QString</a>&)) );
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| 55 |
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| 56 | WebBrowser->dynamicCall( "GoHome()" );
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| 57 | }
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| 58 | </pre>The init() function is implemented to create a progress bar as
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| 59 | the child of the status bar, and to connect Internet Explorer's
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| 60 | <tt>ProgressChange()</tt> and <tt>StatusTextChange()</tt> signals to the
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| 61 | respective displays.
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| 62 | <p> Finally the <tt>GoHome()</tt> function of Internet Explorer is invoked
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| 63 | using the <a href="qaxbase.html#dynamicCall">QAxBase::dynamicCall</a>() dynamicCall() API.
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| 64 | <p> <pre> void MainWindow::go()
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| 65 | {
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| 66 | actionStop->setEnabled( TRUE );
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| 67 | WebBrowser->dynamicCall( "Navigate(const <a href="qstring.html">QString</a>&)", addressEdit->text() );
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| 68 | }
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| 69 | </pre>The go() function calls the <tt>NavigateTo()</tt> function of Internet
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| 70 | Explorer, passing the text of the address bar as the argument.
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| 71 | <p> <pre> void MainWindow::setTitle( const <a href="qstring.html">QString</a> &title )
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| 72 | {
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| 73 | setCaption( "Qt WebBrowser - " + title );
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| 74 | }
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| 75 | </pre>The setTitle() slot is connected to the TitleChange() signal
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| 76 | of Internet Explorer, and updates the caption of the window
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| 77 | using the provided title string.
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| 78 | <p> <pre> void MainWindow::setProgress( int a, int b )
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| 79 | {
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| 80 | if ( a <= 0 || b <= 0 ) {
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| 81 | pb-><a href="qwidget.html#hide">hide</a>();
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| 82 | return;
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| 83 | }
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| 84 | pb-><a href="qwidget.html#show">show</a>();
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| 85 | <a name="x2515"></a> pb-><a href="qprogressbar.html#setTotalSteps">setTotalSteps</a>( b );
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| 86 | <a name="x2514"></a> pb-><a href="qprogressbar.html#setProgress">setProgress</a>( a );
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| 87 | }
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| 88 |
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| 89 | void MainWindow::setCommandState( int cmd, bool on )
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| 90 | {
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| 91 | switch ( cmd ) {
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| 92 | case 1:
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| 93 | actionForward->setEnabled( on );
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| 94 | break;
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| 95 | case 2:
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| 96 | actionBack->setEnabled( on );
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| 97 | break;
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| 98 | }
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| 99 | }
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| 100 |
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| 101 | void MainWindow::navigateBegin()
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| 102 | {
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| 103 | actionStop->setEnabled( TRUE );
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| 104 | }
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| 105 |
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| 106 | void MainWindow::navigateComplete()
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| 107 | {
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| 108 | actionStop->setEnabled( FALSE );
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| 109 | }
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| 110 | </pre>The setProgress(), setCommandState(), navigateBegin() and
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| 111 | navigateComplete() slots are connected to the respective
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| 112 | signals of Internet Explorer and update the user interface.
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| 113 | <p> The rest of the implementation is not related to <a href="activeqt.html#ActiveQt">ActiveQt</a> and
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| 114 | omitted for brevity.
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| 115 | <p> To build the example you must first build the
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| 116 | <a href="qaxcontainer.html">QAxContainer</a> library.
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| 117 | Then run your make tool in <tt>examples/webbrowser</tt> and
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| 118 | run the resulting <tt>webbrowser.exe</tt>.
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| 119 | <p>See also <a href="qaxcontainer-examples.html">The QAxContainer Examples</a>.
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| 120 |
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| 121 | <!-- eof -->
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| 122 | <p><address><hr><div align=center>
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| 123 | <table width=100% cellspacing=0 border=0><tr>
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| 124 | <td>Copyright © 2007
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| 125 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 126 | <td align=right><div align=right>Qt 3.3.8</div>
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| 127 | </table></div></address></body>
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| 128 | </html>
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