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<title>Qt 4.6: Simple Example (ActiveQt)</title>
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<td align="left" valign="top" width="32"><a href="http://qt.nokia.com/"><img src="images/qt-logo.png" align="left" border="0" /></a></td>
<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">Simple Example (ActiveQt)<br /><span class="subtitle"></span>
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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 QSimpleAX : public QWidget, public QAxBindable
{
Q_OBJECT
Q_PROPERTY( QString text READ text WRITE setText )
Q_PROPERTY( int value READ value WRITE setValue )
public:
QSimpleAX(QWidget *parent = 0)
: QWidget(parent)
{
QVBoxLayout *vbox = new QVBoxLayout( this );
slider = new QSlider( Qt::Horizontal, this );
LCD = new QLCDNumber( 3, this );
edit = new QLineEdit( this );
connect( slider, SIGNAL(valueChanged(int)), this, SLOT(setValue(int)) );
connect( edit, SIGNAL(textChanged(QString)), this, SLOT(setText(QString)) );
vbox->addWidget( slider );
vbox->addWidget( LCD );
vbox->addWidget( edit );
}
QString text() const
{
return edit->text();
}
int value() const
{
return slider->value();
}
signals:
void someSignal();
void valueChanged(int);
void textChanged(const QString&);
public slots:
void setText( const QString &string )
{
if ( !requestPropertyChange( "text" ) )
return;
edit->blockSignals( true );
edit->setText( string );
edit->blockSignals( false );
emit someSignal();
emit textChanged( string );
propertyChanged( "text" );
}
void about()
{
QMessageBox::information( this, "About QSimpleAX", "This is a Qt widget, and this slot has been\n"
"called through ActiveX/OLE automation!" );
}
void setValue( int i )
{
if ( !requestPropertyChange( "value" ) )
return;
slider->blockSignals( true );
slider->setValue( i );
slider->blockSignals( false );
LCD->display( i );
emit valueChanged( i );
propertyChanged( "value" );
}
private:
QSlider *slider;
QLCDNumber *LCD;
QLineEdit *edit;
};</pre>
<p>The control is exported using the default <a href="qaxfactory.html">QAxFactory</a></p>
<pre> QAXFACTORY_DEFAULT(QSimpleAX,
"{DF16845C-92CD-4AAB-A982-EB9840E74669}",
"{616F620B-91C5-4410-A74E-6B81C76FFFE0}",
"{E1816BBA-BF5D-4A31-9855-D6BA432055FF}",
"{EC08F8FC-2754-47AB-8EFE-56A54057F34E}",
"{A095BA0C-224F-4933-A458-2DD7F6B85D8F}")</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> <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> <FORM>
<INPUT TYPE="BUTTON" VALUE="About..." onClick="QSimpleAX.about()" />
</FORM></pre>
<p>A second ActiveX control - the standard Calendar Control - is instantiated</p>
<pre> <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> <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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<td width="40%" align="left">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies)</td>
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<td width="40%" align="right"><div align="right">Qt 4.6.3</div></td>
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