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<title>TQt Widget Hierarchy (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>TQt Widget Hierarchy (in-process)</h1>
The ActiveX control in this example is a <a href="ntqwidget.html">TQWidget</a>
subclass with child widgets that are accessible as sub types.
<p>
<pre> class TQParentWidget : public <a href="ntqwidget.html">TQWidget</a>
{
<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
public:
TQParentWidget( <a href="ntqwidget.html">TQWidget</a> *parent = 0, const char *name = 0, WFlags f = 0 );
<a href="ntqsize.html">TQSize</a> sizeHint() const;
public slots:
void createSubWidget( const <a href="ntqstring.html">TQString</a> &name );
TQSubWidget *subWidget( const <a href="ntqstring.html">TQString</a> &name );
private:
<a href="qvboxlayout.html">TQVBoxLayout</a> *vbox;
};
</pre>The <tt>TQParentWidget</tt> class provides slots to create a widget
with a name, and to return a pointer to a named widget.
<p>
<pre> TQParentWidget::TQParentWidget( <a href="ntqwidget.html">TQWidget</a> *parent, const char *name, WFlags f )
: <a href="ntqwidget.html">TQWidget</a>( parent, name, f )
{
vbox = new <a href="qvboxlayout.html">TQVBoxLayout</a>( this );
<a name="x2649"></a> vbox-><a href="ntqlayout.html#setAutoAdd">setAutoAdd</a>( TRUE );
}
</pre>The constructor of TQParentWidget creates a vertical box layout.
New child widgets are automatically added to the layout.
<p> <pre> void TQParentWidget::createSubWidget( const <a href="ntqstring.html">TQString</a> &name )
{
TQSubWidget *sw = new TQSubWidget( this, name );
sw->setLabel( name );
sw-><a href="ntqwidget.html#show">show</a>();
}
</pre>The <tt>createSubWidget</tt> slot creates a new <tt>TQSubWidget</tt> with
the name provided in the parameter, and sets the label to that
name. The widget is also shown explicitly.
<p> <pre> TQSubWidget *TQParentWidget::subWidget( const <a href="ntqstring.html">TQString</a> &name )
{
return (TQSubWidget*)<a href="ntqobject.html#child">child</a>( name, "TQSubWidget" );
}
</pre>The <tt>subWidget</tt> slot uses the <a href="ntqobject.html#child">TQObject::child</a>() function and
returns the first child of type <tt>TQSubWidget</tt> that has the requested
name.
<p>
<pre> class TQSubWidget : public <a href="ntqwidget.html">TQWidget</a>
{
TQ_OBJECT
TQ_PROPERTY( TQString label READ label WRITE setLabel )
public:
TQSubWidget( <a href="ntqwidget.html">TQWidget</a> *parent = 0, const char *name = 0, WFlags f = 0 );
void setLabel( const <a href="ntqstring.html">TQString</a> &text );
<a href="ntqstring.html">TQString</a> label() const;
<a href="ntqsize.html">TQSize</a> sizeHint() const;
protected:
void paintEvent( <a href="qpaintevent.html">TQPaintEvent</a> *e );
private:
<a href="ntqstring.html">TQString</a> lbl;
};
</pre>The <tt>TQSubWidget</tt> class has a single string-property <tt>label</tt>,
and implements the paintEvent to draw the label.
<p>
<pre> TQSubWidget::TQSubWidget( <a href="ntqwidget.html">TQWidget</a> *parent, const char *name, WFlags f )
: <a href="ntqwidget.html">TQWidget</a>( parent, name, f )
{
}
void TQSubWidget::setLabel( const <a href="ntqstring.html">TQString</a> &text )
{
lbl = text;
<a href="ntqobject.html#setName">setName</a>( text );
<a href="ntqwidget.html#update">update</a>();
}
TQString TQSubWidget::label() const
{
return lbl;
}
TQSize TQSubWidget::<a href="ntqwidget.html#sizeHint">sizeHint</a>() const
{
<a href="ntqfontmetrics.html">TQFontMetrics</a> fm( <a href="ntqwidget.html#font">font</a>() );
return TQSize( fm.<a href="ntqfontmetrics.html#width">width</a>(lbl), fm.<a href="ntqfontmetrics.html#height">height</a>() );
}
void TQSubWidget::<a href="ntqwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">TQPaintEvent</a> * )
{
<a href="ntqpainter.html">TQPainter</a> painter(this);
painter.<a href="ntqpainter.html#setPen">setPen</a>( <a href="ntqwidget.html#colorGroup">colorGroup</a>().text() );
painter.<a href="ntqpainter.html#drawText">drawText</a>( <a href="ntqwidget.html#rect">rect</a>(), AlignCenter, lbl );
}
</pre>The implementation of the TQSubWidget class is self-explanatory.
<p>
<pre> class ActiveTQtFactory : public <a href="qaxfactory.html">TQAxFactory</a>
{
public:
ActiveTQtFactory( const <a href="ntquuid.html">TQUuid</a> &lib, const <a href="ntquuid.html">TQUuid</a> &app )
: <a href="qaxfactory.html">TQAxFactory</a>( lib, app )
{}
<a href="ntqstringlist.html">TQStringList</a> featureList() const
{
<a href="ntqstringlist.html">TQStringList</a> list;
list << "TQParentWidget";
list << "TQSubWidget";
return list;
}
</pre>The <tt>ActiveTQtFactory</tt> class implements a <a href="qaxfactory.html">TQAxFactory</a>. It returns
the class names of all supported types, <tt>TQParentWidget</tt> and
<tt>TQSubWidget</tt>, from the <tt>featureList()</tt> reimplementation.
<p> <pre> <a href="ntqwidget.html">TQWidget</a> *create( const <a href="ntqstring.html">TQString</a> &key, TQWidget *parent, const char *name )
{
if ( key == "TQParentWidget" )
return new TQParentWidget( parent, name );
return 0;
}
</pre>The factory can however only create objects of the <tt>TQParentWidget</tt>
type directly - objects of subtypes can only be created through the
interface of <tt>TQParentWidget</tt> objects.
<p> <pre> <a href="ntquuid.html">TQUuid</a> classID( const <a href="ntqstring.html">TQString</a> &key ) const
{
if ( key == "TQParentWidget" )
return TQUuid( "{d574a747-8016-46db-a07c-b2b4854ee75c}" );
if ( key == "TQSubWidget" )
return TQUuid( "{850652f4-8f71-4f69-b745-bce241ccdc30}" );
return TQUuid();
}
<a href="ntquuid.html">TQUuid</a> interfaceID( const <a href="ntqstring.html">TQString</a> &key ) const
{
if ( key == "TQParentWidget" )
return TQUuid( "{4a30719d-d9c2-4659-9d16-67378209f822}" );
if ( key == "TQSubWidget" )
return TQUuid( "{2d76cc2f-3488-417a-83d6-debff88b3c3f}" );
return TQUuid();
}
<a href="ntquuid.html">TQUuid</a> eventsID( const <a href="ntqstring.html">TQString</a> &key ) const
{
if ( key == "TQParentWidget" )
return TQUuid( "{aac9f855-c3dc-4cae-b747-c77f4d509f4c}" );
if ( key == "TQSubWidget" )
return TQUuid( "{25fac47e-c723-4696-8c74-6185903bdf65}" );
return TQUuid();
}
</pre>COM however requires the IDs for the interfaces of the sub types as
well to be able to marshal calls correctly.
<p> <pre> <a href="ntqstring.html">TQString</a> exposeToSuperClass( const <a href="ntqstring.html">TQString</a> &key ) const
{
if ( key == "TQSubWidget" )
return key;
return TQAxFactory::exposeToSuperClass(key);
}
};
</pre>Objects of the <tt>TQSubWidget</tt> type should not expose the full
functionality of e.g. <a href="ntqwidget.html">TQWidget</a>. Only those properties and slots
explicitly declared in the type are accessible.
<p> <pre> TQAXFACTORY_EXPORT( ActiveTQtFactory, "{9e626211-be62-4d18-9483-9419358fbb03}", "{75c276de-1df5-451f-a004-e4fa1a587df1}" )
</pre>The factory is then exported using the <a href="qaxfactory.html#TQAXFACTORY_EXPORT">TQAXFACTORY_EXPORT</a>
macro.
<p> To build the example you must first build the <a href="qaxserver.html">TQAxServer</a> library. Then run qmake and your make tool in
<tt>examples/multiple</tt>.
<p> <hr>
<p> The <a href="qaxserver-demo-hierarchy.html">demonstration</a> requires your
WebBrowser to support ActiveX controls, and scripting to be enabled.
<p>
<pre> <script language=javascript>
function createSubWidget( form )
{
ParentWidget.createSubWidget( form.nameEdit.value );
}
function renameSubWidget( form )
{
var SubWidget = ParentWidget.subWidget( form.nameEdit.value );
if ( !SubWidget ) {
alert( "No such widget " + form.nameEdit.value + "!" );
return;
}
SubWidget.label = form.labelEdit.value;
form.nameEdit.value = SubWidget.label;
}
function setFont( form )
{
ParentWidget.font = form.fontEdit.value;
}
</script>
<p>
This widget can have many children!<br>
<object ID="ParentWidget" CLASSID="CLSID:d574a747-8016-46db-a07c-b2b4854ee75c"
CODEBASE=http://www.trolltech.com/demos/hierarchy.cab>
[Object not available! Did you forget to build and register the server?]
</object><br>
<form>
<input type="edit" ID="nameEdit" value = "<enter object name>">
<input type="button" value = "Create" onClick="createSubWidget(this.form)">
<input type="edit" ID="labelEdit">
<input type="button" value = "Rename" onClick="renameSubWidget(this.form)">
<br>
<input type="edit" ID="fontEdit" value = "MS Sans Serif">
<input type="button" value = "Set Font" onClick="setFont(this.form)">
</form>
</pre><p>See also <a href="qaxserver-examples.html">The TQAxServer Examples</a>.
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