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125 lines
5.4 KiB
125 lines
5.4 KiB
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/extensions/activeqt/examples/tetrax/tetrax.doc:27 -->
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<title>A Qt example as a scriptable ActiveX control (executable)</title>
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<a href="index.html">
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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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<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>
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This example shows how to turn an existing Qt application
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into an ActiveX control server. The ActiveX control is based
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on the Qt tetrix example.
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<p> It demonstrates the use of the default factory provied by the
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<a href="qaxfactory.html#QAXFACTORY_DEFAULT">QAXFACTORY_DEFAULT</a> macro, and of <a href="qaxfactory.html#isServer">QAxFactory::isServer</a>().
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<p> The code changes for the tetrix GUI are minimal (a property <tt>score</tt>,
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a signal <tt>gameOver</tt> and a slot <tt>startGame</tt>) and provide a better scripting
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interface for the use of the control in a web environment.
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<p> The implementation of the ActiveX server functionality is only in the
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tetrax.cpp file.
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The default implementation of the <a href="qaxfactory.html">QAxFactory</a> is used through the
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QAXFACTORY_DEFAULT macro, and exports the QTetrax object specifying
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the five unique IDs required by COM to instantiate and communicate with
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the server.
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<pre> #include "qtetrax.h"
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#include "qdragapp.h"
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#include "qfont.h"
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#include <<a href="qaxfactory-h.html">qaxfactory.h</a>>
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QAXFACTORY_DEFAULT( QTetrax,
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"{852558AD-CBD6-4f07-844C-D1E8983CD6FC}",
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"{2F5D0068-772C-4d1e-BCD2-D3F6BC7FD315}",
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"{769F4820-9F28-490f-BA50-5545BD381DCB}",
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"{5753B1A8-53B9-4abe-8690-6F14EC5CA8D0}",
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"{DE2F7CE3-CFA7-4938-A9FC-867E2FEB63BA}" )
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</pre>The <tt>main</tt> entry point method instantiates a <a href="qapplication.html">QApplication</a> object, and
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creates the GUI only if the program is not running as an ActiveX server (ie.
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the program has been started by the user, not by COM).
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<pre> int main( int argc, char **argv )
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{
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<a name="x2716"></a> QApplication::<a href="qapplication.html#setColorSpec">setColorSpec</a>( QApplication::CustomColor );
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QDragApplication a(argc,argv);
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QTetrax *tetrax = 0;
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if ( !QAxFactory::isServer() ) {
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tetrax = new QTetrax;
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<a name="x2718"></a> tetrax-><a href="qwidget.html#setCaption">setCaption</a>("Tetrax");
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a.<a href="qapplication.html#setMainWidget">setMainWidget</a>(tetrax);
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tetrax-><a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Tetrax");
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tetrax-><a href="qwidget.html#show">show</a>();
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}
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</pre>The server enters the application event loop, and destroys the GUI before exiting.
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<pre> int res = a.<a href="qapplication.html#exec">exec</a>();
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delete tetrax;
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return res;
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}
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</pre>
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<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
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<tt>examples/tetrix</tt>.
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<p> <hr>
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<p> The <a href="qaxserver-demo-tetrax.html">demonstration</a> requires your
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Web browser to support ActiveX controls, and scripting to be enabled.
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<p>
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The "Tetrix" control is embedded using the <tt><object></tt> tag. Note that the
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dimensions of the control are provided explicitely, as the control itself
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does not use Qt's layout engine.
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<pre> <object ID="QTetrax" width=550 height=370
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CLASSID="CLSID:852558AD-CBD6-4f07-844C-D1E8983CD6FC"
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CODEBASE=http://www.trolltech.com/demos/tetrax.cab>
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<PARAM NAME="score" VALUE="0">
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[Object not available! Did you forget to build and register the server?]
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</object>
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</pre>An HTML button is added to start the game.
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<pre> <form>
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<input type="button" value="Start Game..."
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onClick="QTetrax.startGame()">
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</form>
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</pre>And an event handler for the <tt>gameOver()</tt> event is implemented in JavaScript
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to display a simple message box.
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<pre> <SCRIPT LANGUAGE=JavaScript>
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function QTetrax::gameOver()
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{
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alert( "GameOver!" );
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}
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</SCRIPT>
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</pre><p>See also <a href="qaxserver-examples.html">The QAxServer Examples</a>.
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<p><address><hr><div align=center>
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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>Qt 3.3.8</div>
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</table></div></address></body>
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