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<title>Two simple Qt widgets (in-process)</title>
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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>Two simple Qt widgets (in-process)</h1>
The ActiveX controls in this example are simple <a href="qwidget.html">QWidget</a>
subclasses reimplementing the paintEvent() method. The classes use
the Q_CLASSINFO macro to
<p> The example demonstrates the use of the Q_CLASSINFO macro to set
<a href="activeqt.html#ActiveQt">ActiveQt</a>-specific attributes for <a href="qobject.html">QObject</a> sub classes, and the use of
the <a href="qaxfactory.html#QAXFACTORY_BEGIN">QAXFACTORY_BEGIN</a>, <a href="qaxfactory.html#QAXCLASS">QAXCLASS</a> and <a href="qaxfactory.html#QAXFACTORY_END">QAXFACTORY_END</a> macros.
<p>
<pre> class QAxWidget1 : public <a href="qwidget.html">QWidget</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
Q_CLASSINFO("ClassID", "{1D9928BD-4453-4bdd-903D-E525ED17FDE5}")
Q_CLASSINFO("InterfaceID", "{99F6860E-2C5A-42ec-87F2-43396F4BE389}")
Q_CLASSINFO("EventsID", "{0A3E9F27-E4F1-45bb-9E47-63099BCCD0E3}")
</pre>The class declaration includes the Q_OBJECT macro to activate Qt's <a href="metaobjects.html#meta-object">meta object</a> system, and sets COM identifiers for the class using the
Q_CLASSINFO macro.
<pre> Q_PROPERTY( QColor fillColor READ fillColor WRITE setFillColor )
public:
QAxWidget1( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0, WFlags f = 0 )
: <a href="qwidget.html">QWidget</a>( parent, name, f ), fill_color( red )
{
}
<a href="qcolor.html">QColor</a> fillColor() const
{
return fill_color;
}
void setFillColor( const <a href="qcolor.html">QColor</a> &fc )
{
fill_color = fc;
repaint();
}
protected:
void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> *e )
{
<a href="qpainter.html">QPainter</a> paint( this );
<a href="qrect.html">QRect</a> r = rect();
<a name="x2544"></a> r.<a href="qrect.html#addCoords">addCoords</a>( 10, 10, -10, -10 );
<a name="x2543"></a> paint.<a href="qpainter.html#fillRect">fillRect</a>( r, fill_color );
}
private:
<a href="qcolor.html">QColor</a> fill_color;
};
</pre>The control draws a filled rectangle. The fill color is exposed as a
property using the Q_PROPERTY macro.
<p>
<pre> class QAxWidget2 : public <a href="qwidget.html">QWidget</a>
{
Q_OBJECT
Q_CLASSINFO("ClassID", "{58139D56-6BE9-4b17-937D-1B1EDEDD5B71}")
Q_CLASSINFO("InterfaceID", "{B66280AB-08CC-4dcc-924F-58E6D7975B7D}")
Q_CLASSINFO("EventsID", "{D72BACBA-03C4-4480-B4BB-DE4FE3AA14A0}")
Q_CLASSINFO("ToSuperClass", "QAxWidget2")
Q_CLASSINFO("StockEvents", "yes")
</pre>The declaration of the second control class uses the Q_CLASSINFO macro
to set the COM identifiers as well as additional COM attributes for the
class. Objects of that class will not expose the <a href="qwidget.html">QWidget</a> API, and provide
the ActiveX stock events (ie. Click, KeyDown etc.).
<pre> Q_PROPERTY( int lineWidth READ lineWidth WRITE setLineWidth )
public:
QAxWidget2( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0, WFlags f = 0 )
: <a href="qwidget.html">QWidget</a>( parent, name, f ), line_width( 1 )
{
}
int lineWidth() const
{
return line_width;
}
void setLineWidth( int lw )
{
line_width = lw;
repaint();
}
protected:
void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> *e )
{
<a href="qpainter.html">QPainter</a> paint( this );
<a name="x2546"></a> <a href="qpen.html">QPen</a> pen = paint.<a href="qpainter.html#pen">pen</a>();
<a name="x2548"></a> pen.<a href="qpen.html#setWidth">setWidth</a>( line_width );
<a name="x2547"></a> paint.<a href="qpainter.html#setPen">setPen</a>( pen );
<a href="qrect.html">QRect</a> r = rect();
<a name="x2549"></a> r.<a href="qrect.html#addCoords">addCoords</a>( 10, 10, -10, -10 );
<a name="x2545"></a> paint.<a href="qpainter.html#drawEllipse">drawEllipse</a>( r );
}
private:
int line_width;
};
</pre>The control draws a circle. The line width is exposed as a property
using the Q_PROPERTY macro.
<p> The controls are exposed by the implementation of <a href="qaxfactory.html">QAxFactory</a> as provided
by the QAXFACTORY_BEGIN and QAXFACTORY_END macros.
<pre> #include <<a href="qaxfactory-h.html">qaxfactory.h</a>>
#include "ax1.h"
#include "ax2.h"
QAXFACTORY_BEGIN("{98DE28B6-6CD3-4e08-B9FA-3D1DB43F1D2F}", "{05828915-AD1C-47ab-AB96-D6AD1E25F0E2}")
</pre>The factory is initialied using the QAXFACTORY_BEGIN macro, providing
the IDs for the application and the type library.
<pre> QAXCLASS(QAxWidget1)
QAXCLASS(QAxWidget2)
</pre>The classes exposed are listed using the QAXCLASS macro.
<pre> QAXFACTORY_END()
</pre>Finally the factory declaration is closed using the QAXFACTORY_END
macro.
<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/multiple</tt>.
<p> <hr>
<p> The <a href="qaxserver-demo-multiple.html">demonstration</a> requires your
WebBrowser to support ActiveX controls, and scripting to be enabled.
<p>
<pre> <script language=javascript>
function setColor( form )
{
Ax1.fillColor = form.colorEdit.value;
}
function setWidth( form )
{
Ax2.lineWidth = form.widthEdit.value;
}
</script>
<p>
This is one QWidget subclass:<br>
<object ID="Ax1" CLASSID="CLSID:1D9928BD-4453-4bdd-903D-E525ED17FDE5"
CODEBASE=http://www.trolltech.com/demos/multipleax.cab>
[Object not available! Did you forget to build and register the server?]
</object><br>
<form>
Fill Color: <input type="edit" ID="colorEdit" value = "red">
<input type="button" value = "Set" onClick="setColor(this.form)">
<input type="button" value = "Hide" onClick="Ax1.hide()">
<input type="button" value = "Show" onClick="Ax1.show()">
</form>
<p>
This is another QWidget subclass:<br>
<object ID="Ax2" CLASSID="CLSID:58139D56-6BE9-4b17-937D-1B1EDEDD5B71"
CODEBASE=http://www.trolltech.com/demos/multipleax.cab>
[Object not available! Did you forget to build and register the server?]
</object><br>
<form>
Line width: <input type="edit" ID="widthEdit" value = "1">
<input type="button" value = "Set" onClick="setWidth(this.form)">
</form>
</pre><p>See also <a href="qaxserver-examples.html">The QAxServer Examples</a>.
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