doc/html/qaxcontainer-example-webbrowser.html


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<title>A Web Browser</title>
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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>

 

This example utilizes the Microsoft Web Browser ActiveX control 
to implement a fully functional Web Browser application. The
user interface has been developed using the Qt Designer
integration of the <a href="qaxwidget.html">QAxWidget</a> class.
<p> The code demonstrates how the Qt application can communicate 
with the embedded ActiveX controls using signals, slots and the 
dynamicCall() function. Most signal and slot connections have
already been set up within Qt Designer.
<p> 

<pre>    void MainWindow::init()
    {
        pb = new <a href="qprogressbar.html">QProgressBar</a>( statusBar() );
    <a name="x2513"></a>    pb-&gt;<a href="qprogressbar.html#setPercentageVisible">setPercentageVisible</a>( FALSE );
    <a name="x2516"></a>    pb-&gt;<a href="qwidget.html#hide">hide</a>();
        statusBar()-&gt;addWidget( pb, 0, TRUE );

        connect( WebBrowser, SIGNAL(ProgressChange(int,int)), this, SLOT(setProgress(int,int)) );
        connect( WebBrowser, SIGNAL(StatusTextChange(const <a href="qstring.html">QString</a>&amp;)), statusBar(), SLOT(message(const <a href="qstring.html">QString</a>&amp;)) );

        WebBrowser-&gt;dynamicCall( "GoHome()" );
    }
</pre>The init() function is implemented to create a progress bar as
the child of the status bar, and to connect Internet Explorer's 
<tt>ProgressChange()</tt> and <tt>StatusTextChange()</tt> signals to the
respective displays.
<p> Finally the <tt>GoHome()</tt> function of Internet Explorer is invoked
using the <a href="qaxbase.html#dynamicCall">QAxBase::dynamicCall</a>() dynamicCall() API.
<p> <pre>    void MainWindow::go()
    {
        actionStop-&gt;setEnabled( TRUE );
        WebBrowser-&gt;dynamicCall( "Navigate(const <a href="qstring.html">QString</a>&amp;)", addressEdit-&gt;text() );
    }
</pre>The go() function calls the <tt>NavigateTo()</tt> function of Internet
Explorer, passing the text of the address bar as the argument.
<p> <pre>    void MainWindow::setTitle( const <a href="qstring.html">QString</a> &amp;title )
    {
        setCaption( "Qt WebBrowser - " + title );
    }
</pre>The setTitle() slot is connected to the TitleChange() signal
of Internet Explorer, and updates the caption of the window
using the provided title string.
<p> <pre>    void MainWindow::setProgress( int a, int b )
    {
        if ( a &lt;= 0 || b &lt;= 0 ) {
            pb-&gt;<a href="qwidget.html#hide">hide</a>();
            return;
        }
        pb-&gt;<a href="qwidget.html#show">show</a>();
    <a name="x2515"></a>    pb-&gt;<a href="qprogressbar.html#setTotalSteps">setTotalSteps</a>( b );
    <a name="x2514"></a>    pb-&gt;<a href="qprogressbar.html#setProgress">setProgress</a>( a );
    }

    void MainWindow::setCommandState( int cmd, bool on )
    {
        switch ( cmd ) {
        case 1:
            actionForward-&gt;setEnabled( on );
            break;
        case 2:
            actionBack-&gt;setEnabled( on );
            break;
        }
    }

    void MainWindow::navigateBegin()
    {
        actionStop-&gt;setEnabled( TRUE );
    }

    void MainWindow::navigateComplete()
    {
        actionStop-&gt;setEnabled( FALSE );
    }
</pre>The setProgress(), setCommandState(), navigateBegin() and
navigateComplete() slots are connected to the respective
signals of Internet Explorer and update the user interface.
<p> The rest of the implementation is not related to <a href="activeqt.html#ActiveQt">ActiveQt</a> and
omitted for brevity.
<p> To build the example you must first build the
<a href="qaxcontainer.html">QAxContainer</a> library.
Then run your make tool in <tt>examples/webbrowser</tt> and
run the resulting <tt>webbrowser.exe</tt>.
<p>See also <a href="qaxcontainer-examples.html">The QAxContainer Examples</a>.

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