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<?xml version="1.0" encoding="UTF-8"?>
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<title>Qt 4.8: Simple Example (ActiveQt)</title>
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<a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
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<li>Simple Example (ActiveQt)</li>
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<h1 class="title">Simple Example (ActiveQt)</h1>
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<p>Files:</p>
<ul>
<li><a href="activeqt-simple-main-cpp.html">activeqt/simple/main.cpp</a></li>
<li><a href="activeqt-simple-simple-pro.html">activeqt/simple/simple.pro</a></li>
</ul>
<p>The Simple example demonstrates the use of <a href="qaxbindable.html#requestPropertyChange">QAxBindable::requestPropertyChange</a>() and <a href="qaxbindable.html#propertyChanged">QAxBindable::propertyChanged</a>(), and the use of the default <a href="qaxfactory.html">QAxFactory</a> through the <tt>QAXFACTORY_DEFAULT()</tt> macro.</p>
<p>The ActiveX control in this example is a laid out <a href="qwidget.html">QWidget</a> with a <a href="qslider.html">QSlider</a>, a <a href="qlcdnumber.html">QLCDNumber</a> and a <a href="qlineedit.html">QLineEdit</a>. It provides a signal/slot/property interface to change the values of the slider and the line edit, and to get notified of any property changes.</p>
<p>The Qt implementation of the ActiveX for this example is</p>
<pre class="cpp"> <span class="keyword">class</span> <span class="type">QSimpleAX</span> : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">,</span> <span class="keyword">public</span> <span class="type"><a href="qaxbindable.html">QAxBindable</a></span>
{
Q_OBJECT
Q_PROPERTY( <span class="type"><a href="qstring.html">QString</a></span> text READ text WRITE setText )
Q_PROPERTY( <span class="type">int</span> value READ value WRITE setValue )
<span class="keyword">public</span>:
<span class="type">QSimpleAX</span>(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>)
: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
{
<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>vbox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>( <span class="keyword">this</span> );
slider <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qslider.html">QSlider</a></span>( <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> <span class="keyword">this</span> );
LCD <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlcdnumber.html">QLCDNumber</a></span>( <span class="number">3</span><span class="operator">,</span> <span class="keyword">this</span> );
edit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>( <span class="keyword">this</span> );
connect( slider<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setValue(<span class="type">int</span>)) );
connect( edit<span class="operator">,</span> SIGNAL(textChanged(<span class="type"><a href="qstring.html">QString</a></span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setText(<span class="type"><a href="qstring.html">QString</a></span>)) );
vbox<span class="operator">-</span><span class="operator">></span>addWidget( slider );
vbox<span class="operator">-</span><span class="operator">></span>addWidget( LCD );
vbox<span class="operator">-</span><span class="operator">></span>addWidget( edit );
}
<span class="type"><a href="qstring.html">QString</a></span> text() <span class="keyword">const</span>
{
<span class="keyword">return</span> edit<span class="operator">-</span><span class="operator">></span>text();
}
<span class="type">int</span> value() <span class="keyword">const</span>
{
<span class="keyword">return</span> slider<span class="operator">-</span><span class="operator">></span>value();
}
<span class="keyword">signals</span>:
<span class="type">void</span> someSignal();
<span class="type">void</span> valueChanged(<span class="type">int</span>);
<span class="type">void</span> textChanged(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">&</span>);
<span class="keyword">public</span> <span class="keyword">slots</span>:
<span class="type">void</span> setText( <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>string )
{
<span class="keyword">if</span> ( <span class="operator">!</span>requestPropertyChange( <span class="string">"text"</span> ) )
<span class="keyword">return</span>;
edit<span class="operator">-</span><span class="operator">></span>blockSignals( <span class="keyword">true</span> );
edit<span class="operator">-</span><span class="operator">></span>setText( string );
edit<span class="operator">-</span><span class="operator">></span>blockSignals( <span class="keyword">false</span> );
<span class="keyword">emit</span> someSignal();
<span class="keyword">emit</span> textChanged( string );
propertyChanged( <span class="string">"text"</span> );
}
<span class="type">void</span> about()
{
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information( <span class="keyword">this</span><span class="operator">,</span> <span class="string">"About QSimpleAX"</span><span class="operator">,</span> <span class="string">"This is a Qt widget, and this slot has been\n"</span>
<span class="string">"called through ActiveX/OLE automation!"</span> );
}
<span class="type">void</span> setValue( <span class="type">int</span> i )
{
<span class="keyword">if</span> ( <span class="operator">!</span>requestPropertyChange( <span class="string">"value"</span> ) )
<span class="keyword">return</span>;
slider<span class="operator">-</span><span class="operator">></span>blockSignals( <span class="keyword">true</span> );
slider<span class="operator">-</span><span class="operator">></span>setValue( i );
slider<span class="operator">-</span><span class="operator">></span>blockSignals( <span class="keyword">false</span> );
LCD<span class="operator">-</span><span class="operator">></span>display( i );
<span class="keyword">emit</span> valueChanged( i );
propertyChanged( <span class="string">"value"</span> );
}
<span class="keyword">private</span>:
<span class="type"><a href="qslider.html">QSlider</a></span> <span class="operator">*</span>slider;
<span class="type"><a href="qlcdnumber.html">QLCDNumber</a></span> <span class="operator">*</span>LCD;
<span class="type"><a href="qlineedit.html">QLineEdit</a></span> <span class="operator">*</span>edit;
};</pre>
<p>The control is exported using the default <a href="qaxfactory.html">QAxFactory</a></p>
<pre class="cpp"> <a href="qaxfactory.html#QAXFACTORY_DEFAULT">QAXFACTORY_DEFAULT</a>(<span class="type">QSimpleAX</span><span class="operator">,</span>
<span class="string">"{DF16845C-92CD-4AAB-A982-EB9840E74669}"</span><span class="operator">,</span>
<span class="string">"{616F620B-91C5-4410-A74E-6B81C76FFFE0}"</span><span class="operator">,</span>
<span class="string">"{E1816BBA-BF5D-4A31-9855-D6BA432055FF}"</span><span class="operator">,</span>
<span class="string">"{EC08F8FC-2754-47AB-8EFE-56A54057F34E}"</span><span class="operator">,</span>
<span class="string">"{A095BA0C-224F-4933-A458-2DD7F6B85D8F}"</span>)</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/activeqt/simple</tt>.</p>
<p>The <a href="qaxserver-demo-simple.html">demonstration</a> requires your WebBrowser to support ActiveX controls, and scripting to be enabled.</p>
<p>The simple ActiveX control is embedded using the <tt><object></tt> tag.</p>
<pre class="cpp"> <object ID="QSimpleAX" CLASSID="CLSID:DF16845C-92CD-4AAB-A982-EB9840E74669"
CODEBASE="http://qt.nokia.com/demos/simpleax.cab">
<PARAM NAME="text" VALUE="A simple control" />
<PARAM NAME="value" VALUE="1" />
[Object not available! Did you forget to build and register the server?]
</object></pre>
<p>A simple HTML button is connected to the <a href="activeqt.html#activeqt">ActiveQt</a>'s about() slot.</p>
<pre class="cpp"> <FORM>
<INPUT TYPE="BUTTON" VALUE="About..." onClick="QSimpleAX.about()" />
</FORM></pre>
<p>A second ActiveX control - the standard Calendar Control - is instantiated</p>
<pre class="cpp"> <object ID="Calendar" CLASSID="CLSID:8E27C92B-1264-101C-8A2F-040224009C02">
[Standard Calendar control not available!]
<PARAM NAME="day" VALUE="1" />
</object></pre>
<p>Events from the ActiveX controls are handled using both Visual Basic Script and JavaScript.</p>
<pre class="cpp"> <SCRIPT LANGUAGE="VBScript">
Sub Calendar_Click()
MsgBox( "Calendar Clicked!" )
End Sub
Sub QSimpleAX_TextChanged( str )
document.title = str
End Sub
</SCRIPT>
<SCRIPT LANGUAGE="JavaScript">
function QSimpleAX::ValueChanged( Newvalue )
{
Calendar.Day = Newvalue;
}
</SCRIPT></pre>
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