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Home » Modeling » GMF (Graphical Modeling Framework) » Create a node after a drop action on the diagram
Create a node after a drop action on the diagram [message #146927] Fri, 17 August 2007 09:12
Vincent Zurczak is currently offline Vincent ZurczakFriend
Messages: 149
Registered: July 2009
Senior Member
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Hi.<br>
<br>
I have implemented a drag &amp; drop from a view onto the diagram. This
works fine (I mean, I detect the drop event and dropped data).<br>
But I would like to create a node right after the drop event and I
can't make it work.<br>
<br>
The drop action is detected by the diagram edit part (named
OrchestrationEditPart in my modeller).<br>
I have installed an EditPolicy on it, which extends
DragDropEditPolicy.&nbsp; <br>
I have overidden the method "getDropObjectsCommand(DropObjectsRequest
request)" and created a command in it to create my node. <br>
<br>
Here is the code.<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; @Override<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; protected Command getDropObjectsCommand(DropObjectsRequest
request) {<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <b>CompositeCommand cm = new CompositeCommand("Drop
Objects Command");</b><br>
<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; Iterator elements = request.getObjects().iterator();<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; while (elements.hasNext()) {<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; Object obj = elements.next();<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; if( obj instanceof String) {<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; System.out.println("yooohoo = " + (String) obj);<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; /* request to create a new element and its view
*/&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <b>CreateViewAndElementRequest creation = <br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; new CreateViewAndElementRequest(<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
OrchestrationElementTypes.Service_1001,&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
orchestrationEditPart.getDiagramPreferencesHint()<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; );<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; ICommand cmd = new CommandProxy(
orchestrationEditPart.getCommand( creation ));<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; cm.add( cmd );</b><br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <b>return new ICommandProxy(cm);&nbsp;&nbsp;&nbsp; </b><br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }<br>
<br>
<br>
"Orchestration" is the root element in my meta-model. And "Service" is
the node I want to create (view and model). And I drop text on my
diagram.<br>
I thought that return this command would be enough. But on the drop,
the editor doesn't get dirty and nothing change.<br>
I tried to execute directly this command but I got an error (read-write
transaction in a read-only transaction). And the printing works.<br>
<br>
Does anybody know what I have forgotten or mistaken ?<br>
Is it the use of a CompositeCommand ? Do I have to use an
AbstractTransactionnalCommand and create "manually" the node ?<br>
Who should be called to get the command ? My diagram EditPart or the
node EditPart ?<br>
<br>
Any help will be appreciated.<br>
<br>
Regards,<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; Vincent.<br>
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