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<h1 class="title">Hierarchy Example (ActiveQt)</h1>
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<li><a href="activeqt-hierarchy-objects-cpp.html">activeqt/hierarchy/objects.cpp</a></li>
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<p>The Hierarchy example is shows how to write an in-process ActiveX control. The control is a <a href="qwidget.html">QWidget</a> subclass with child widgets that are accessible as sub-types.<pre class="cpp"> <span class="keyword">class</span> <span class="type">QParentWidget</span> : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span>
{
Q_OBJECT
Q_CLASSINFO(<span class="string">&quot;ClassID&quot;</span><span class="operator">,</span> <span class="string">&quot;{d574a747-8016-46db-a07c-b2b4854ee75c}&quot;</span>);
Q_CLASSINFO(<span class="string">&quot;InterfaceID&quot;</span><span class="operator">,</span> <span class="string">&quot;{4a30719d-d9c2-4659-9d16-67378209f822}&quot;</span>);
Q_CLASSINFO(<span class="string">&quot;EventsID&quot;</span><span class="operator">,</span> <span class="string">&quot;{4a30719d-d9c2-4659-9d16-67378209f823}&quot;</span>);
<span class="keyword">public</span>:
<span class="type">QParentWidget</span>(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>);
<span class="type"><a href="qsize.html">QSize</a></span> sizeHint() <span class="keyword">const</span>;
<span class="keyword">public</span> <span class="keyword">slots</span>:
<span class="type">void</span> createSubWidget( <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>name );
<span class="type">QSubWidget</span> <span class="operator">*</span>subWidget( <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>name );
<span class="keyword">private</span>:
<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>vbox;
};</pre>
<p>The <tt>QParentWidget</tt> class provides slots to create a widget with a name, and to return a pointer to a named widget. The class declaration uses <tt>Q_CLASSINFO()</tt> to provide the COM identifiers for this class.</p>
<pre class="cpp"> <span class="type">QParentWidget</span><span class="operator">::</span><span class="type">QParentWidget</span>(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
{
vbox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>(<span class="keyword">this</span>);
}</pre>
<p>The constructor of QParentWidget creates a vertical box layout. New child widgets are automatically added to the layout.</p>
<pre class="cpp"> <span class="type">void</span> <span class="type">QParentWidget</span><span class="operator">::</span>createSubWidget(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>name)
{
<span class="type">QSubWidget</span> <span class="operator">*</span>sw <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QSubWidget</span>(<span class="keyword">this</span><span class="operator">,</span> name);
vbox<span class="operator">-</span><span class="operator">&gt;</span>addWidget(sw);
sw<span class="operator">-</span><span class="operator">&gt;</span>setLabel(name);
sw<span class="operator">-</span><span class="operator">&gt;</span>show();
}</pre>
<p>The <tt>createSubWidget</tt> slot creates a new <tt>QSubWidget</tt> with the name provided in the parameter, and sets the label to that name. The widget is also shown explicitly.</p>
<pre class="cpp"> <span class="type">QSubWidget</span> <span class="operator">*</span><span class="type">QParentWidget</span><span class="operator">::</span>subWidget(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>name)
{
<span class="keyword">return</span> findChild<span class="operator">&lt;</span><span class="type">QSubWidget</span><span class="operator">*</span><span class="operator">&gt;</span>(name);
}</pre>
<p>The <tt>subWidget</tt> slot uses the <tt>QObject::child()</tt> function and returns the first child of type <tt>QSubWidget</tt> that has the requested name.</p>
<pre class="cpp"> <span class="keyword">class</span> <span class="type">QSubWidget</span> : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span>
{
Q_OBJECT
Q_PROPERTY( <span class="type"><a href="qstring.html">QString</a></span> label READ label WRITE setLabel )
Q_CLASSINFO(<span class="string">&quot;ClassID&quot;</span><span class="operator">,</span> <span class="string">&quot;{850652f4-8f71-4f69-b745-bce241ccdc30}&quot;</span>);
Q_CLASSINFO(<span class="string">&quot;InterfaceID&quot;</span><span class="operator">,</span> <span class="string">&quot;{2d76cc2f-3488-417a-83d6-debff88b3c3f}&quot;</span>);
Q_CLASSINFO(<span class="string">&quot;ToSuperClass&quot;</span><span class="operator">,</span> <span class="string">&quot;QSubWidget&quot;</span>);
<span class="keyword">public</span>:
<span class="type">QSubWidget</span>(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span><span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>name <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>());
<span class="type">void</span> setLabel( <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>text );
<span class="type"><a href="qstring.html">QString</a></span> label() <span class="keyword">const</span>;
<span class="type"><a href="qsize.html">QSize</a></span> sizeHint() <span class="keyword">const</span>;
<span class="keyword">protected</span>:
<span class="type">void</span> paintEvent( <span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>e );
<span class="keyword">private</span>:
<span class="type"><a href="qstring.html">QString</a></span> lbl;
};</pre>
<p>The <tt>QSubWidget</tt> class has a single string-property <tt>label</tt>, and implements the paintEvent to draw the label. The class uses again <tt>Q_CLASSINFO</tt> to provide the COM identifiers, and also sets the <i>ToSuperClass</i> attribute to <i>QSubWidget</i>, to ensure that only no slots of any superclasses (i.e&#x2e; <a href="qwidget.html">QWidget</a>) are exposed.</p>
<pre class="cpp"> <span class="type">QSubWidget</span><span class="operator">::</span><span class="type">QSubWidget</span>(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>name)
: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
{
setObjectName(name);
}
<span class="type">void</span> <span class="type">QSubWidget</span><span class="operator">::</span>setLabel(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>text)
{
lbl <span class="operator">=</span> text;
setObjectName(text);
update();
}
<span class="type"><a href="qstring.html">QString</a></span> <span class="type">QSubWidget</span><span class="operator">::</span>label() <span class="keyword">const</span>
{
<span class="keyword">return</span> lbl;
}
<span class="type"><a href="qsize.html">QSize</a></span> <span class="type">QSubWidget</span><span class="operator">::</span>sizeHint() <span class="keyword">const</span>
{
<span class="type"><a href="qfontmetrics.html">QFontMetrics</a></span> fm(font());
<span class="keyword">return</span> <span class="type"><a href="qsize.html">QSize</a></span>(fm<span class="operator">.</span>width(lbl)<span class="operator">,</span> fm<span class="operator">.</span>height());
}
<span class="type">void</span> <span class="type">QSubWidget</span><span class="operator">::</span>paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>)
{
<span class="type"><a href="qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>);
painter<span class="operator">.</span>setPen(palette()<span class="operator">.</span>text()<span class="operator">.</span>color());
painter<span class="operator">.</span>drawText(rect()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>AlignCenter<span class="operator">,</span> lbl);
}</pre>
<p>The implementation of the QSubWidget class is self-explanatory.</p>
<pre class="cpp"> <span class="preprocessor">#include &quot;objects.h&quot;</span>
<span class="preprocessor">#include &lt;QAxFactory&gt;</span>
<a href="qaxfactory.html#QAXFACTORY_BEGIN">QAXFACTORY_BEGIN</a>(<span class="string">&quot;{9e626211-be62-4d18-9483-9419358fbb03}&quot;</span><span class="operator">,</span> <span class="string">&quot;{75c276de-1df5-451f-a004-e4fa1a587df1}&quot;</span>)
<a href="qaxfactory.html#QAXCLASS">QAXCLASS</a>(<span class="type">QParentWidget</span>)
<a href="qaxfactory.html#QAXTYPE">QAXTYPE</a>(<span class="type">QSubWidget</span>)
<a href="qaxfactory.html#QAXFACTORY_END">QAXFACTORY_END</a>()</pre>
<p>The classes are then exported using a <a href="qaxfactory.html">QAxFactory</a>. <tt>QParentWidget</tt> is exported as a full class (which can be created ), while <tt>QSubWidget</tt> is only exported as a type, which can only be created indirectly through APIs of <tt>QParentWidget</tt>.</p>
<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/hierarchy</tt>.</p>
<p>The <a href="qaxserver-demo-hierarchy.html">demonstration</a> requires your WebBrowser to support ActiveX controls, and scripting to be enabled.</p>
<pre class="cpp"> &lt;script language=&quot;javascript&quot;&gt;
function createSubWidget( form )
{
ParentWidget.createSubWidget( form.nameEdit.value );
}
function renameSubWidget( form )
{
var SubWidget = ParentWidget.subWidget( form.nameEdit.value );
if ( !SubWidget ) {
alert( &quot;No such widget &quot; + form.nameEdit.value + &quot;!&quot; );
return;
}
SubWidget.label = form.labelEdit.value;
form.nameEdit.value = SubWidget.label;
}
function setFont( form )
{
ParentWidget.font = form.fontEdit.value;
}
&lt;/script&gt;
&lt;p&gt;
This widget can have many children!
&lt;/p&gt;
&lt;object ID=&quot;ParentWidget&quot; CLASSID=&quot;CLSID:d574a747-8016-46db-a07c-b2b4854ee75c&quot;
CODEBASE=&quot;http://www.qt-project.org/demos/hierarchy.cab&quot;&gt;
[Object not available! Did you forget to build and register the server?]
&lt;/object&gt;&lt;br /&gt;
&lt;form&gt;
&lt;input type=&quot;edit&quot; ID=&quot;nameEdit&quot; value=&quot;&amp;lt;enter object name&amp;gt;&quot; /&gt;
&lt;input type=&quot;button&quot; value=&quot;Create&quot; onClick=&quot;createSubWidget(this.form)&quot; /&gt;
&lt;input type=&quot;edit&quot; ID=&quot;labelEdit&quot; /&gt;
&lt;input type=&quot;button&quot; value=&quot;Rename&quot; onClick=&quot;renameSubWidget(this.form)&quot; /&gt;
&lt;br /&gt;
&lt;input type=&quot;edit&quot; ID=&quot;fontEdit&quot; value=&quot;MS Sans Serif&quot; /&gt;
&lt;input type=&quot;button&quot; value = &quot;Set Font&quot; onClick=&quot;setFont(this.form)&quot; /&gt;
&lt;/form&gt;</pre>
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