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263 lines
11 KiB
263 lines
11 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/extensions/activeqt/examples/hierarchy/hierarchy.doc:47 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Qt Widget Hierarchy (in-process)</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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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>Qt Widget Hierarchy (in-process)</h1>
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The ActiveX control in this example is a <a href="qwidget.html">QWidget</a>
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subclass with child widgets that are accessible as sub types.
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<p>
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<pre> class QParentWidget : public <a href="qwidget.html">QWidget</a>
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{
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<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
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public:
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QParentWidget( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0, WFlags f = 0 );
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<a href="qsize.html">QSize</a> sizeHint() const;
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public slots:
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void createSubWidget( const <a href="qstring.html">QString</a> &name );
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QSubWidget *subWidget( const <a href="qstring.html">QString</a> &name );
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private:
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<a href="qvboxlayout.html">QVBoxLayout</a> *vbox;
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};
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</pre>The <tt>QParentWidget</tt> class provides slots to create a widget
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with a name, and to return a pointer to a named widget.
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<p>
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<pre> QParentWidget::QParentWidget( <a href="qwidget.html">QWidget</a> *parent, const char *name, WFlags f )
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: <a href="qwidget.html">QWidget</a>( parent, name, f )
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{
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vbox = new <a href="qvboxlayout.html">QVBoxLayout</a>( this );
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<a name="x2649"></a> vbox-><a href="qlayout.html#setAutoAdd">setAutoAdd</a>( TRUE );
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}
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</pre>The constructor of QParentWidget creates a vertical box layout.
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New child widgets are automatically added to the layout.
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<p> <pre> void QParentWidget::createSubWidget( const <a href="qstring.html">QString</a> &name )
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{
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QSubWidget *sw = new QSubWidget( this, name );
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sw->setLabel( name );
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sw-><a href="qwidget.html#show">show</a>();
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}
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</pre>The <tt>createSubWidget</tt> slot creates a new <tt>QSubWidget</tt> with
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the name provided in the parameter, and sets the label to that
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name. The widget is also shown explicitly.
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<p> <pre> QSubWidget *QParentWidget::subWidget( const <a href="qstring.html">QString</a> &name )
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{
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return (QSubWidget*)<a href="qobject.html#child">child</a>( name, "QSubWidget" );
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}
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</pre>The <tt>subWidget</tt> slot uses the <a href="qobject.html#child">QObject::child</a>() function and
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returns the first child of type <tt>QSubWidget</tt> that has the requested
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name.
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<p>
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<pre> class QSubWidget : public <a href="qwidget.html">QWidget</a>
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{
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Q_OBJECT
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Q_PROPERTY( QString label READ label WRITE setLabel )
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public:
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QSubWidget( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0, WFlags f = 0 );
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void setLabel( const <a href="qstring.html">QString</a> &text );
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<a href="qstring.html">QString</a> label() const;
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<a href="qsize.html">QSize</a> sizeHint() const;
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protected:
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void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> *e );
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private:
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<a href="qstring.html">QString</a> lbl;
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};
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</pre>The <tt>QSubWidget</tt> class has a single string-property <tt>label</tt>,
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and implements the paintEvent to draw the label.
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<p>
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<pre> QSubWidget::QSubWidget( <a href="qwidget.html">QWidget</a> *parent, const char *name, WFlags f )
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: <a href="qwidget.html">QWidget</a>( parent, name, f )
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{
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}
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void QSubWidget::setLabel( const <a href="qstring.html">QString</a> &text )
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{
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lbl = text;
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<a href="qobject.html#setName">setName</a>( text );
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<a href="qwidget.html#update">update</a>();
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}
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QString QSubWidget::label() const
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{
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return lbl;
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}
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QSize QSubWidget::<a href="qwidget.html#sizeHint">sizeHint</a>() const
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{
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<a href="qfontmetrics.html">QFontMetrics</a> fm( <a href="qwidget.html#font">font</a>() );
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return QSize( fm.<a href="qfontmetrics.html#width">width</a>(lbl), fm.<a href="qfontmetrics.html#height">height</a>() );
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}
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void QSubWidget::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * )
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{
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<a href="qpainter.html">QPainter</a> painter(this);
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painter.<a href="qpainter.html#setPen">setPen</a>( <a href="qwidget.html#colorGroup">colorGroup</a>().text() );
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painter.<a href="qpainter.html#drawText">drawText</a>( <a href="qwidget.html#rect">rect</a>(), AlignCenter, lbl );
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}
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</pre>The implementation of the QSubWidget class is self-explanatory.
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<p>
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<pre> class ActiveQtFactory : public <a href="qaxfactory.html">QAxFactory</a>
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{
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public:
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ActiveQtFactory( const <a href="quuid.html">QUuid</a> &lib, const <a href="quuid.html">QUuid</a> &app )
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: <a href="qaxfactory.html">QAxFactory</a>( lib, app )
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{}
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<a href="qstringlist.html">QStringList</a> featureList() const
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{
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<a href="qstringlist.html">QStringList</a> list;
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list << "QParentWidget";
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list << "QSubWidget";
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return list;
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}
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</pre>The <tt>ActiveQtFactory</tt> class implements a <a href="qaxfactory.html">QAxFactory</a>. It returns
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the class names of all supported types, <tt>QParentWidget</tt> and
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<tt>QSubWidget</tt>, from the <tt>featureList()</tt> reimplementation.
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<p> <pre> <a href="qwidget.html">QWidget</a> *create( const <a href="qstring.html">QString</a> &key, QWidget *parent, const char *name )
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{
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if ( key == "QParentWidget" )
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return new QParentWidget( parent, name );
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return 0;
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}
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</pre>The factory can however only create objects of the <tt>QParentWidget</tt>
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type directly - objects of subtypes can only be created through the
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interface of <tt>QParentWidget</tt> objects.
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<p> <pre> <a href="quuid.html">QUuid</a> classID( const <a href="qstring.html">QString</a> &key ) const
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{
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if ( key == "QParentWidget" )
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return QUuid( "{d574a747-8016-46db-a07c-b2b4854ee75c}" );
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if ( key == "QSubWidget" )
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return QUuid( "{850652f4-8f71-4f69-b745-bce241ccdc30}" );
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return QUuid();
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}
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<a href="quuid.html">QUuid</a> interfaceID( const <a href="qstring.html">QString</a> &key ) const
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{
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if ( key == "QParentWidget" )
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return QUuid( "{4a30719d-d9c2-4659-9d16-67378209f822}" );
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if ( key == "QSubWidget" )
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return QUuid( "{2d76cc2f-3488-417a-83d6-debff88b3c3f}" );
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return QUuid();
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}
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<a href="quuid.html">QUuid</a> eventsID( const <a href="qstring.html">QString</a> &key ) const
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{
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if ( key == "QParentWidget" )
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return QUuid( "{aac9f855-c3dc-4cae-b747-c77f4d509f4c}" );
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if ( key == "QSubWidget" )
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return QUuid( "{25fac47e-c723-4696-8c74-6185903bdf65}" );
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return QUuid();
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}
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</pre>COM however requires the IDs for the interfaces of the sub types as
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well to be able to marshal calls correctly.
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<p> <pre> <a href="qstring.html">QString</a> exposeToSuperClass( const <a href="qstring.html">QString</a> &key ) const
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{
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if ( key == "QSubWidget" )
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return key;
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return QAxFactory::exposeToSuperClass(key);
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}
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};
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</pre>Objects of the <tt>QSubWidget</tt> type should not expose the full
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functionality of e.g. <a href="qwidget.html">QWidget</a>. Only those properties and slots
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explicitly declared in the type are accessible.
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<p> <pre> QAXFACTORY_EXPORT( ActiveQtFactory, "{9e626211-be62-4d18-9483-9419358fbb03}", "{75c276de-1df5-451f-a004-e4fa1a587df1}" )
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</pre>The factory is then exported using the <a href="qaxfactory.html#QAXFACTORY_EXPORT">QAXFACTORY_EXPORT</a>
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macro.
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<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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<tt>examples/multiple</tt>.
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<p> <hr>
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<p> The <a href="qaxserver-demo-hierarchy.html">demonstration</a> requires your
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WebBrowser to support ActiveX controls, and scripting to be enabled.
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<p>
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<pre> <script language=javascript>
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function createSubWidget( form )
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{
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ParentWidget.createSubWidget( form.nameEdit.value );
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}
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function renameSubWidget( form )
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{
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var SubWidget = ParentWidget.subWidget( form.nameEdit.value );
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if ( !SubWidget ) {
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alert( "No such widget " + form.nameEdit.value + "!" );
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return;
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}
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SubWidget.label = form.labelEdit.value;
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form.nameEdit.value = SubWidget.label;
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}
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function setFont( form )
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{
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ParentWidget.font = form.fontEdit.value;
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}
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</script>
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<p>
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This widget can have many children!<br>
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<object ID="ParentWidget" CLASSID="CLSID:d574a747-8016-46db-a07c-b2b4854ee75c"
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CODEBASE=http://www.trolltech.com/demos/hierarchy.cab>
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[Object not available! Did you forget to build and register the server?]
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</object><br>
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<form>
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<input type="edit" ID="nameEdit" value = "<enter object name>">
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<input type="button" value = "Create" onClick="createSubWidget(this.form)">
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<input type="edit" ID="labelEdit">
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<input type="button" value = "Rename" onClick="renameSubWidget(this.form)">
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<br>
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<input type="edit" ID="fontEdit" value = "MS Sans Serif">
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<input type="button" value = "Set Font" onClick="setFont(this.form)">
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</form>
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</pre><p>See also <a href="qaxserver-examples.html">The QAxServer Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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