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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 Qt example as a scriptable ActiveX control (executable)</h1>
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| 33 |
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| 34 |
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| 35 |
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| 36 | This example shows how to turn an existing Qt application
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| 37 | into an ActiveX control server. The ActiveX control is based
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| 38 | on the Qt tetrix example.
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| 39 | <p> It demonstrates the use of the default factory provied by the
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| 40 | <a href="qaxfactory.html#QAXFACTORY_DEFAULT">QAXFACTORY_DEFAULT</a> macro, and of <a href="qaxfactory.html#isServer">QAxFactory::isServer</a>().
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| 41 | <p> The code changes for the tetrix GUI are minimal (a property <tt>score</tt>,
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| 42 | a signal <tt>gameOver</tt> and a slot <tt>startGame</tt>) and provide a better scripting
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| 43 | interface for the use of the control in a web environment.
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| 44 | <p> The implementation of the ActiveX server functionality is only in the
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| 45 | tetrax.cpp file.
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| 46 |
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| 47 |
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| 48 | The default implementation of the <a href="qaxfactory.html">QAxFactory</a> is used through the
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| 49 | QAXFACTORY_DEFAULT macro, and exports the QTetrax object specifying
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| 50 | the five unique IDs required by COM to instantiate and communicate with
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| 51 | the server.
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| 52 | <pre> #include "qtetrax.h"
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| 53 | #include "qdragapp.h"
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| 54 | #include "qfont.h"
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| 55 |
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| 56 | #include <<a href="qaxfactory-h.html">qaxfactory.h</a>>
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| 57 |
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| 58 | QAXFACTORY_DEFAULT( QTetrax,
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| 59 | "{852558AD-CBD6-4f07-844C-D1E8983CD6FC}",
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| 60 | "{2F5D0068-772C-4d1e-BCD2-D3F6BC7FD315}",
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| 61 | "{769F4820-9F28-490f-BA50-5545BD381DCB}",
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| 62 | "{5753B1A8-53B9-4abe-8690-6F14EC5CA8D0}",
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| 63 | "{DE2F7CE3-CFA7-4938-A9FC-867E2FEB63BA}" )
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| 64 | </pre>The <tt>main</tt> entry point method instantiates a <a href="qapplication.html">QApplication</a> object, and
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| 65 | creates the GUI only if the program is not running as an ActiveX server (ie.
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| 66 | the program has been started by the user, not by COM).
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| 67 | <pre> int main( int argc, char **argv )
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| 68 | {
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| 69 | <a name="x2716"></a> QApplication::<a href="qapplication.html#setColorSpec">setColorSpec</a>( QApplication::CustomColor );
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| 70 | QDragApplication a(argc,argv);
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| 71 |
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| 72 | QTetrax *tetrax = 0;
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| 73 | if ( !QAxFactory::isServer() ) {
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| 74 | tetrax = new QTetrax;
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| 75 | <a name="x2718"></a> tetrax-><a href="qwidget.html#setCaption">setCaption</a>("Tetrax");
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| 76 | a.<a href="qapplication.html#setMainWidget">setMainWidget</a>(tetrax);
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| 77 | tetrax-><a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Tetrax");
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| 78 | tetrax-><a href="qwidget.html#show">show</a>();
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| 79 | }
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| 80 | </pre>The server enters the application event loop, and destroys the GUI before exiting.
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| 81 | <pre> int res = a.<a href="qapplication.html#exec">exec</a>();
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| 82 | delete tetrax;
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| 83 | return res;
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| 84 | }
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| 85 | </pre>
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| 86 | <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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| 87 | <tt>examples/tetrix</tt>.
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| 88 | <p> <hr>
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| 89 | <p> The <a href="qaxserver-demo-tetrax.html">demonstration</a> requires your
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| 90 | Web browser to support ActiveX controls, and scripting to be enabled.
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| 91 | <p>
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| 92 |
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| 93 | The "Tetrix" control is embedded using the <tt><object></tt> tag. Note that the
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| 94 | dimensions of the control are provided explicitely, as the control itself
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| 95 | does not use Qt's layout engine.
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| 96 | <pre> <object ID="QTetrax" width=550 height=370
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| 97 | CLASSID="CLSID:852558AD-CBD6-4f07-844C-D1E8983CD6FC"
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| 98 | CODEBASE=http://www.trolltech.com/demos/tetrax.cab>
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| 99 | <PARAM NAME="score" VALUE="0">
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| 100 | [Object not available! Did you forget to build and register the server?]
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| 101 | </object>
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| 102 | </pre>An HTML button is added to start the game.
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| 103 | <pre> <form>
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| 104 | <input type="button" value="Start Game..."
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| 105 | onClick="QTetrax.startGame()">
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| 106 | </form>
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| 107 | </pre>And an event handler for the <tt>gameOver()</tt> event is implemented in JavaScript
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| 108 | to display a simple message box.
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| 109 | <pre> <SCRIPT LANGUAGE=JavaScript>
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| 110 | function QTetrax::gameOver()
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| 111 | {
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| 112 | alert( "GameOver!" );
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| 113 | }
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| 114 | </SCRIPT>
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| 115 | </pre><p>See also <a href="qaxserver-examples.html">The QAxServer Examples</a>.
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| 116 |
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| 117 | <!-- eof -->
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| 118 | <p><address><hr><div align=center>
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| 120 | <td>Copyright © 2007
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| 121 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 122 | <td align=right><div align=right>Qt 3.3.8</div>
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| 123 | </table></div></address></body>
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