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6<title>Qt Widget Hierarchy (in-process)</title>
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32<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>
33
34
35
36The ActiveX control in this example is a <a href="qwidget.html">QWidget</a>
37subclass with child widgets that are accessible as sub types.
38<p>
39
40<pre> class QParentWidget : public <a href="qwidget.html">QWidget</a>
41 {
42 <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
43 public:
44 QParentWidget( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0, WFlags f = 0 );
45
46 <a href="qsize.html">QSize</a> sizeHint() const;
47
48 public slots:
49 void createSubWidget( const <a href="qstring.html">QString</a> &amp;name );
50
51 QSubWidget *subWidget( const <a href="qstring.html">QString</a> &amp;name );
52
53 private:
54 <a href="qvboxlayout.html">QVBoxLayout</a> *vbox;
55 };
56</pre>The <tt>QParentWidget</tt> class provides slots to create a widget
57with a name, and to return a pointer to a named widget.
58<p>
59
60<pre> QParentWidget::QParentWidget( <a href="qwidget.html">QWidget</a> *parent, const char *name, WFlags f )
61 : <a href="qwidget.html">QWidget</a>( parent, name, f )
62 {
63 vbox = new <a href="qvboxlayout.html">QVBoxLayout</a>( this );
64 <a name="x2649"></a> vbox-&gt;<a href="qlayout.html#setAutoAdd">setAutoAdd</a>( TRUE );
65 }
66</pre>The constructor of QParentWidget creates a vertical box layout.
67New child widgets are automatically added to the layout.
68<p> <pre> void QParentWidget::createSubWidget( const <a href="qstring.html">QString</a> &amp;name )
69 {
70 QSubWidget *sw = new QSubWidget( this, name );
71 sw-&gt;setLabel( name );
72 sw-&gt;<a href="qwidget.html#show">show</a>();
73 }
74</pre>The <tt>createSubWidget</tt> slot creates a new <tt>QSubWidget</tt> with
75the name provided in the parameter, and sets the label to that
76name. The widget is also shown explicitly.
77<p> <pre> QSubWidget *QParentWidget::subWidget( const <a href="qstring.html">QString</a> &amp;name )
78 {
79 return (QSubWidget*)<a href="qobject.html#child">child</a>( name, "QSubWidget" );
80 }
81</pre>The <tt>subWidget</tt> slot uses the <a href="qobject.html#child">QObject::child</a>() function and
82returns the first child of type <tt>QSubWidget</tt> that has the requested
83name.
84<p>
85
86<pre> class QSubWidget : public <a href="qwidget.html">QWidget</a>
87 {
88 Q_OBJECT
89 Q_PROPERTY( QString label READ label WRITE setLabel )
90 public:
91 QSubWidget( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0, WFlags f = 0 );
92
93 void setLabel( const <a href="qstring.html">QString</a> &amp;text );
94 <a href="qstring.html">QString</a> label() const;
95
96 <a href="qsize.html">QSize</a> sizeHint() const;
97
98 protected:
99 void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> *e );
100
101 private:
102 <a href="qstring.html">QString</a> lbl;
103 };
104</pre>The <tt>QSubWidget</tt> class has a single string-property <tt>label</tt>,
105and implements the paintEvent to draw the label.
106<p>
107
108<pre> QSubWidget::QSubWidget( <a href="qwidget.html">QWidget</a> *parent, const char *name, WFlags f )
109 : <a href="qwidget.html">QWidget</a>( parent, name, f )
110 {
111 }
112
113 void QSubWidget::setLabel( const <a href="qstring.html">QString</a> &amp;text )
114 {
115 lbl = text;
116 <a href="qobject.html#setName">setName</a>( text );
117 <a href="qwidget.html#update">update</a>();
118 }
119
120 QString QSubWidget::label() const
121 {
122 return lbl;
123 }
124
125 QSize QSubWidget::<a href="qwidget.html#sizeHint">sizeHint</a>() const
126 {
127 <a href="qfontmetrics.html">QFontMetrics</a> fm( <a href="qwidget.html#font">font</a>() );
128 return QSize( fm.<a href="qfontmetrics.html#width">width</a>(lbl), fm.<a href="qfontmetrics.html#height">height</a>() );
129 }
130
131 void QSubWidget::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * )
132 {
133 <a href="qpainter.html">QPainter</a> painter(this);
134 painter.<a href="qpainter.html#setPen">setPen</a>( <a href="qwidget.html#colorGroup">colorGroup</a>().text() );
135 painter.<a href="qpainter.html#drawText">drawText</a>( <a href="qwidget.html#rect">rect</a>(), AlignCenter, lbl );
136 }
137</pre>The implementation of the QSubWidget class is self-explanatory.
138<p>
139
140<pre> class ActiveQtFactory : public <a href="qaxfactory.html">QAxFactory</a>
141 {
142 public:
143 ActiveQtFactory( const <a href="quuid.html">QUuid</a> &amp;lib, const <a href="quuid.html">QUuid</a> &amp;app )
144 : <a href="qaxfactory.html">QAxFactory</a>( lib, app )
145 {}
146 <a href="qstringlist.html">QStringList</a> featureList() const
147 {
148 <a href="qstringlist.html">QStringList</a> list;
149 list &lt;&lt; "QParentWidget";
150 list &lt;&lt; "QSubWidget";
151 return list;
152 }
153</pre>The <tt>ActiveQtFactory</tt> class implements a <a href="qaxfactory.html">QAxFactory</a>. It returns
154the class names of all supported types, <tt>QParentWidget</tt> and
155<tt>QSubWidget</tt>, from the <tt>featureList()</tt> reimplementation.
156<p> <pre> <a href="qwidget.html">QWidget</a> *create( const <a href="qstring.html">QString</a> &amp;key, QWidget *parent, const char *name )
157 {
158 if ( key == "QParentWidget" )
159 return new QParentWidget( parent, name );
160
161 return 0;
162 }
163</pre>The factory can however only create objects of the <tt>QParentWidget</tt>
164type directly - objects of subtypes can only be created through the
165interface of <tt>QParentWidget</tt> objects.
166<p> <pre> <a href="quuid.html">QUuid</a> classID( const <a href="qstring.html">QString</a> &amp;key ) const
167 {
168 if ( key == "QParentWidget" )
169 return QUuid( "{d574a747-8016-46db-a07c-b2b4854ee75c}" );
170 if ( key == "QSubWidget" )
171 return QUuid( "{850652f4-8f71-4f69-b745-bce241ccdc30}" );
172
173 return QUuid();
174 }
175 <a href="quuid.html">QUuid</a> interfaceID( const <a href="qstring.html">QString</a> &amp;key ) const
176 {
177 if ( key == "QParentWidget" )
178 return QUuid( "{4a30719d-d9c2-4659-9d16-67378209f822}" );
179 if ( key == "QSubWidget" )
180 return QUuid( "{2d76cc2f-3488-417a-83d6-debff88b3c3f}" );
181
182 return QUuid();
183 }
184 <a href="quuid.html">QUuid</a> eventsID( const <a href="qstring.html">QString</a> &amp;key ) const
185 {
186 if ( key == "QParentWidget" )
187 return QUuid( "{aac9f855-c3dc-4cae-b747-c77f4d509f4c}" );
188 if ( key == "QSubWidget" )
189 return QUuid( "{25fac47e-c723-4696-8c74-6185903bdf65}" );
190
191 return QUuid();
192 }
193</pre>COM however requires the IDs for the interfaces of the sub types as
194well to be able to marshal calls correctly.
195<p> <pre> <a href="qstring.html">QString</a> exposeToSuperClass( const <a href="qstring.html">QString</a> &amp;key ) const
196 {
197 if ( key == "QSubWidget" )
198 return key;
199 return QAxFactory::exposeToSuperClass(key);
200 }
201 };
202</pre>Objects of the <tt>QSubWidget</tt> type should not expose the full
203functionality of e.g. <a href="qwidget.html">QWidget</a>. Only those properties and slots
204explicitly declared in the type are accessible.
205<p> <pre> QAXFACTORY_EXPORT( ActiveQtFactory, "{9e626211-be62-4d18-9483-9419358fbb03}", "{75c276de-1df5-451f-a004-e4fa1a587df1}" )
206</pre>The factory is then exported using the <a href="qaxfactory.html#QAXFACTORY_EXPORT">QAXFACTORY_EXPORT</a>
207macro.
208<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
209<tt>examples/multiple</tt>.
210<p> <hr>
211<p> The <a href="qaxserver-demo-hierarchy.html">demonstration</a> requires your
212WebBrowser to support ActiveX controls, and scripting to be enabled.
213<p>
214
215<pre> &lt;script language=javascript&gt;
216 function createSubWidget( form )
217 {
218 ParentWidget.createSubWidget( form.nameEdit.value );
219 }
220
221 function renameSubWidget( form )
222 {
223 var SubWidget = ParentWidget.subWidget( form.nameEdit.value );
224 if ( !SubWidget ) {
225 alert( "No such widget " + form.nameEdit.value + "!" );
226 return;
227 }
228 SubWidget.label = form.labelEdit.value;
229 form.nameEdit.value = SubWidget.label;
230 }
231
232 function setFont( form )
233 {
234 ParentWidget.font = form.fontEdit.value;
235 }
236 &lt;/script&gt;
237
238 &lt;p&gt;
239 This widget can have many children!&lt;br&gt;
240 &lt;object ID="ParentWidget" CLASSID="CLSID:d574a747-8016-46db-a07c-b2b4854ee75c"
241 CODEBASE=http://www.trolltech.com/demos/hierarchy.cab&gt;
242 [Object not available! Did you forget to build and register the server?]
243 &lt;/object&gt;&lt;br&gt;
244 &lt;form&gt;
245 &lt;input type="edit" ID="nameEdit" value = "&lt;enter object name&gt;"&gt;
246 &lt;input type="button" value = "Create" onClick="createSubWidget(this.form)"&gt;
247 &lt;input type="edit" ID="labelEdit"&gt;
248 &lt;input type="button" value = "Rename" onClick="renameSubWidget(this.form)"&gt;
249 &lt;br&gt;
250 &lt;input type="edit" ID="fontEdit" value = "MS Sans Serif"&gt;
251 &lt;input type="button" value = "Set Font" onClick="setFont(this.form)"&gt;
252 &lt;/form&gt;
253</pre><p>See also <a href="qaxserver-examples.html">The QAxServer Examples</a>.
254
255<!-- eof -->
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257<table width=100% cellspacing=0 border=0><tr>
258<td>Copyright &copy; 2007
259<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
260<td align=right><div align=right>Qt 3.3.8</div>
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