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<div class=WordSection1>
<h1><span lang=EN-GB>Providing Layout Functionality</span></h1>
<p class=MsoNormal><span lang=EN-GB style='color:black'>&nbsp;</span><span
lang=EN-GB>&nbsp;</span></p>
<h2><span lang=EN-GB>Create a Layout Feature</span></h2>
<p class=MsoNormal><span lang=EN-GB style='color:black'>&nbsp;</span></p>
<p class=MsoNormal><span lang=EN-GB>If you already enlarged a EClass in the
diagram, you may have observed that the shapes inside the rectangle kept their size
(EClass name is not longer in the centre and the line separator is too short).
Graphiti<span style='color:black'> provides the concept of layout features,
which mainly supports the recalculation of positions and sizes inside the
pictogram model. </span></span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>Theoretical such
functionality could also be implemented by <a href="resize-feature.htm">providing
resize functionality</a>, but using a layout feature for this is the
recommended solution.</span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>&nbsp;</span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>A layout feature has to
implement the interface </span><span class=code1><span lang=EN-US
style='color:black'><a
href="../../../javadoc/org/eclipse/graphiti/features/ILayoutFeature.html"><span
style='font-style:normal'>ILayoutFeature</span></a>.</span></span><span
lang=EN-US style='color:black'> </span><span lang=EN-GB style='color:black'>Instead
of implementing it directly you should extend one of the available base
classes. In this example we extend the base class<span class=code1> </span></span><span
class=code1><span lang=EN-US style='color:black'><a
href="../../../javadoc/org/eclipse/graphiti/features/impl/AbstractLayoutFeature.html"><span
style='font-style:normal'>AbstractLayoutFeature</span></a></span></span><span
lang=EN-GB style='color:black'>.</span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>&nbsp;</span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>In this case we have to
implement/overwrite two methods:</span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>The method <a
href="../../../javadoc/org/eclipse/graphiti/func/ILayout.html#canLayout(org.eclipse.graphiti.features.context.ILayoutContext)">c<span
lang=EN-US>anLayout</span></a> has to check whether the pictogram element of
the given context can be layouted. </span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>The method </span><span
class=code1><span lang=EN-US style='color:black'><a
href="../../../javadoc/org/eclipse/graphiti/func/ILayout.html#layout(org.eclipse.graphiti.features.context.ILayoutContext)"><span
style='font-style:normal'>layout</span></a></span></span><span lang=EN-GB
style='color:black'> has to recalculate and modify everything needed to layout
the pictogram element given with the context. </span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>&nbsp;</span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>You can see the
complete implementation of the move feature here:</span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>&nbsp;</span></p>
<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=680
style='width:18.0cm;border-collapse:collapse'>
<tr>
<td width=680 valign=top style='width:18.0cm;border:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal style='text-autospace:none'><b><span lang=EN-GB
style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>&nbsp;</span></b></p>
<p class=MsoNormal style='text-autospace:none'><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>package</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>
org.eclipse.graphiti.examples.tutorial.features;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>public</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>class</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> TutorialLayoutEClassFeature
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>extends</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> AbstractLayoutFeature {</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>private</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> </span><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>static</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>final</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>int</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><i><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#0000C0'>MIN_HEIGHT</span></i><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> =
30;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>private</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> </span><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>static</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>final</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>int</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><i><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#0000C0'>MIN_WIDTH</span></i><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'> =
50;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>public</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'>
TutorialLayoutEClassFeature(IFeatureProvider fp) {</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>super</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'>(fp);</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;
}</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>public</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> </span><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>boolean</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>
canLayout(ILayoutContext context) {</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#3F7F5F'>//
return true, if pictogram element is linked to an EClass</span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
PictogramElement pe = context.getPictogramElement();</span></p>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Courier New";color:#7F0055'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> (!(pe <b><span
style='color:#7F0055'>instanceof</span></b> ContainerShape))</span></p>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Courier New";color:#7F0055'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>
<b><span style='color:#7F0055'>false</span></b>;</span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
EList&lt;EObject&gt; businessObjects = pe.getLink().getBusinessObjects();</span></p>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Courier New";color:#7F0055'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>
businessObjects.size() == 1 <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&amp;&amp; businessObjects.get(0) <b><span style='color:#7F0055'>instanceof</span></b>
EClass;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;
}</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>public</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> </span><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>boolean</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>
layout(ILayoutContext context) {</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>boolean</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> anythingChanged = </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>false</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
ContainerShape containerShape =</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
(ContainerShape) context.getPictogramElement();</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
GraphicsAlgorithm containerGa = containerShape.getGraphicsAlgorithm();</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#3F7F5F'>// height</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>if</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> (containerGa.getHeight() &lt; </span><i><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#0000C0'>MIN_HEIGHT</span></i><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>) {</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;containerGa.setHeight(</span><i><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#0000C0'>MIN_HEIGHT</span></i><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>);</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
anythingChanged = </span><b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:#7F0055'>true</span></b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#3F7F5F'>// width</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>if</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> (containerGa.getWidth() &lt; </span><i><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#0000C0'>MIN_WIDTH</span></i><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>) {</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
containerGa.setWidth(</span><i><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:#0000C0'>MIN_WIDTH</span></i><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>);</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
anythingChanged = </span><b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:#7F0055'>true</span></b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>int</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> containerWidth =
containerGa.getWidth();</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>for </span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New"'>(Shape shape : containerShape.getChildren())</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>{</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
GraphicsAlgorithm graphicsAlgorithm = shape.getGraphicsAlgorithm();</span><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IGaService
gaService = Graphiti.getGaService();</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
IDimension size = <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>gaService<span
style='color:black'>.calculateSize(graphicsAlgorithm);</span></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>if</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> (containerWidth != size.getWidth()) {</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>if</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> (graphicsAlgorithm </span><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>instanceof</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>
Polyline) {</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Polyline
polyline = (Polyline) graphicsAlgorithm;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Point secondPoint = polyline.getPoints().get(1);</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Point newSecondPoint =</span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>gaService<span
style='color:black'>.createPoint(containerWidth,</span> secondPoint.getY());</span><span
lang=EN-US> </span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
polyline.getPoints().set(1, newSecondPoint);</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
anythingChanged = </span><b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:#7F0055'>true</span></b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
} </span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>else</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> {</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>gaService<span
style='color:black'>.setWidth(graphicsAlgorithm,</span></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
containerWidth);</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
anythingChanged = </span><b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:#7F0055'>true</span></b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>return</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> anythingChanged;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;
</span><span style='font-size:10.0pt;font-family:"Courier New";color:black'>}</span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:black'>}</span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Courier New";
color:black'>&nbsp;</span></p>
</td>
</tr>
</table>
<p class=MsoNormal><span lang=EN-GB style='color:black'>&nbsp;</span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>Additionally the feature
provider has to deliver our newly created feature (overwrite the method </span><span
class=code1><span lang=EN-US style='color:black;font-style:normal'><a
href="../../../javadoc/org/eclipse/graphiti/features/IFeatureProvider.html#getLayoutFeature(org.eclipse.graphiti.features.context.ILayoutContext)">getLayoutFeature</a>)</span></span><i><span
lang=EN-GB style='color:black'>.</span></i><span lang=EN-GB style='color:black'>
</span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>This implementation can
be seen here:</span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>&nbsp;</span></p>
<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=680
style='width:18.0cm;border-collapse:collapse'>
<tr>
<td width=680 valign=top style='width:18.0cm;border:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-GB
style='font-size:10.0pt;font-family:"Courier New";color:#3F7F5F'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#646464'>@Override</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>public</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> ILayoutFeature
getLayoutFeature(ILayoutContext context) {</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
PictogramElement pictogramElement = context.getPictogramElement();</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Object bo = getBusinessObjectForPictogramElement(pictogramElement);</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>if</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> (bo </span><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>instanceof</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>
EClass) {</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>return</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> </span><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>new</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>
TutorialLayoutEClassFeature(</span><b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:#7F0055'>this</span></b><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>);</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span style='font-size:10.0pt;font-family:"Courier New";color:black'>}</span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><b><span style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>return</span></b><span
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span><b><span
style='font-size:10.0pt;font-family:"Courier New";color:#7F0055'>super</span></b><span
style='font-size:10.0pt;font-family:"Courier New";color:black'>.getLayoutFeature(context);</span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp; }</span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>&nbsp;</span></p>
</td>
</tr>
</table>
<p class=MsoNormal><span lang=EN-GB style='color:black'>&nbsp;</span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>Finally we have to call
the layout feature at the end of the add method of the </span><span
class=code1><span lang=EN-US style='color:black'>TutorialAddEClassFeature</span></span><span
class=code1><span lang=EN-US style='color:black;font-style:normal'>, as shown
in the following code snippet.</span></span></p>
<p class=MsoNormal><span class=code1><span lang=EN-US style='color:black;
font-style:normal'>This causes that the layout (especially the layout
restrictions like minimum size) are applied after adding a EClass.</span></span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>&nbsp;</span></p>
<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=680
style='width:18.0cm;border-collapse:collapse'>
<tr>
<td width=680 valign=top style='width:18.0cm;border:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-GB
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>public</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> PictogramElement add(IAddContext
context) {</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#3F7F5F'>// ... EXiSTING CODING ...</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#3F7F5F'>// call the layout feature</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
layoutPictogramElement(containerShape);</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";
color:#7F0055'>return</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Courier New";color:black'> containerShape;</span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;
</span><span style='font-size:10.0pt;font-family:"Courier New";color:black'>}</span><span
lang=EN-GB style='font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;</span></p>
<p class=MsoNormal style='text-autospace:none'>&nbsp;</p>
</td>
</tr>
</table>
<p class=MsoNormal><span lang=EN-GB style='color:black'>&nbsp;</span></p>
<p class=MsoNormal>&nbsp;</p>
<h2><span lang=EN-GB>Test: Layout EClass after Resize</span></h2>
<p class=MsoNormal><span lang=EN-GB style='color:black'>&nbsp;</span></p>
<p class=MsoNormal><span lang=EN-GB style='color:black'>Now start the editor
again and test it: Try to resize a EClass. You see that the class name stays in
the centre and the line separator will be automatically extended.</span></p>
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