/usr/share/qt3/doc/html/qaxserver-example-tetrax.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/extensions/activeqt/examples/tetrax/tetrax.doc:27 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>A Qt example as a scriptable ActiveX control (executable)</title>
<style type="text/css"><!--
fn { margin-left: 1cm; text-indent: -1cm; }
a:link { color: #004faf; text-decoration: none }
a:visited { color: #672967; text-decoration: none }
body { background: #ffffff; color: black; }
--></style>
</head>
<body>

<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr bgcolor="#E5E5E5">
<td valign=center>
 <a href="index.html">
<font color="#004faf">Home</font></a>
 | <a href="classes.html">
<font color="#004faf">All&nbsp;Classes</font></a>
 | <a href="mainclasses.html">
<font color="#004faf">Main&nbsp;Classes</font></a>
 | <a href="annotated.html">
<font color="#004faf">Annotated</font></a>
 | <a href="groups.html">
<font color="#004faf">Grouped&nbsp;Classes</font></a>
 | <a href="functions.html">
<font color="#004faf">Functions</font></a>
</td>
<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>A Qt example as a scriptable ActiveX control (executable)</h1>

 

This example shows how to turn an existing Qt application
into an ActiveX control server. The ActiveX control is based
on the Qt tetrix example.
<p> It demonstrates the use of the default factory provied by the 
<a href="qaxfactory.html#QAXFACTORY_DEFAULT">QAXFACTORY_DEFAULT</a> macro, and of <a href="qaxfactory.html#isServer">QAxFactory::isServer</a>().
<p> The code changes for the tetrix GUI are minimal (a property <tt>score</tt>, 
a signal <tt>gameOver</tt> and a slot <tt>startGame</tt>) and provide a better scripting 
interface for the use of the control in a web environment.
<p> The implementation of the ActiveX server functionality is only in the
tetrax.cpp file.


The default implementation of the <a href="qaxfactory.html">QAxFactory</a> is used through the 
QAXFACTORY_DEFAULT macro, and exports the QTetrax object specifying
the five unique IDs required by COM to instantiate and communicate with
the server.
<pre>    #include "qtetrax.h"
    #include "qdragapp.h"
    #include "qfont.h"

    #include &lt;<a href="qaxfactory-h.html">qaxfactory.h</a>&gt;

    QAXFACTORY_DEFAULT( QTetrax,
                "{852558AD-CBD6-4f07-844C-D1E8983CD6FC}",
                "{2F5D0068-772C-4d1e-BCD2-D3F6BC7FD315}",
                "{769F4820-9F28-490f-BA50-5545BD381DCB}",
                "{5753B1A8-53B9-4abe-8690-6F14EC5CA8D0}",
                "{DE2F7CE3-CFA7-4938-A9FC-867E2FEB63BA}" )
</pre>The <tt>main</tt> entry point method instantiates a <a href="qapplication.html">QApplication</a> object, and
creates the GUI only if the program is not running as an ActiveX server (ie.
the program has been started by the user, not by COM). 
<pre>    int main( int argc, char **argv )
    {
    <a name="x2716"></a>    QApplication::<a href="qapplication.html#setColorSpec">setColorSpec</a>( QApplication::CustomColor );
        QDragApplication a(argc,argv);

        QTetrax *tetrax = 0;
        if ( !QAxFactory::isServer() ) {
            tetrax = new QTetrax;
    <a name="x2718"></a>        tetrax-&gt;<a href="qwidget.html#setCaption">setCaption</a>("Tetrax");
            a.<a href="qapplication.html#setMainWidget">setMainWidget</a>(tetrax);
            tetrax-&gt;<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Tetrax");
            tetrax-&gt;<a href="qwidget.html#show">show</a>();
        }
</pre>The server enters the application event loop, and destroys the GUI before exiting.
<pre>        int res = a.<a href="qapplication.html#exec">exec</a>();
        delete tetrax;
        return res;
    }
</pre>
<p> To build the example you must first build the <a href="qaxserver.html">QAxServer</a> library. Then run qmake and your make tool in 
<tt>examples/tetrix</tt>.
<p> <hr>
<p> The <a href="qaxserver-demo-tetrax.html">demonstration</a> requires your
Web browser to support ActiveX controls, and scripting to be enabled.
<p> 

The "Tetrix" control is embedded using the <tt>&lt;object&gt;</tt> tag. Note that the
dimensions of the control are provided explicitely, as the control itself
does not use Qt's layout engine.
<pre>    &lt;object ID="QTetrax" width=550 height=370
        CLASSID="CLSID:852558AD-CBD6-4f07-844C-D1E8983CD6FC"
        CODEBASE=http://www.trolltech.com/demos/tetrax.cab&gt;
        &lt;PARAM NAME="score" VALUE="0"&gt;
    [Object not available! Did you forget to build and register the server?]
    &lt;/object&gt;
</pre>An HTML button is added to start the game.
<pre>    &lt;form&gt;
        &lt;input type="button" value="Start Game..."
            onClick="QTetrax.startGame()"&gt;
    &lt;/form&gt;
</pre>And an event handler for the <tt>gameOver()</tt> event is implemented in JavaScript
to display a simple message box.
<pre>    &lt;SCRIPT LANGUAGE=JavaScript&gt;
    function QTetrax::gameOver()
    {
        alert( "GameOver!" );
    }
    &lt;/SCRIPT&gt;
</pre><p>See also <a href="qaxserver-examples.html">The QAxServer Examples</a>.

<!-- eof -->
<p><address><hr><div align=center>
<table width=100% cellspacing=0 border=0><tr>
<td>Copyright &copy; 2007
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt 3.3.8</div>
</table></div></address></body>
</html>
qt3-doc 3:3.3.8-b-8ubuntu3 / usr / share / qt3 / doc / html / qaxserver-example-tetrax.html
