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Home » Modeling » GMF (Graphical Modeling Framework) » Command#canExecute is false, why ?
Command#canExecute is false, why ? [message #535900] Wed, 26 May 2010 09:32
Ralf is currently offline RalfFriend
Messages: 25
Registered: March 2010
Junior Member
I created a simple DropEditPolicy which always inserts the same basic node (Activity_2003), but the created CompoundCommand always is not executable (canExecute() == false). Can anyone give me a clue where's the problem ?

public class DropObjectEditPolicy extends GraphicalEditPolicy implements EditPolicy {

	public Command getCommand(Request request) {
		if (RequestConstants.REQ_DROP_OBJECTS.equals(request.getType())) {
			DropObjectsRequest dndRequest = (DropObjectsRequest) request;
			return getDropCommand(dndRequest);
		return null;

	private Command getDropCommand(DropObjectsRequest dndRequest) {

		ProcessEditPart editor = (ProcessEditPart) getHost();
		IElementType type = ProcessElementTypes.Activity_2003; // Basic node, can be placed anywhere
		ViewAndElementDescriptor viewDescriptor = new ViewAndElementDescriptor(
				new CreateElementRequestAdapter(new CreateElementRequest(type)),
				((IHintedType) type).getSemanticHint(),

		CreateViewAndElementRequest req = new CreateViewAndElementRequest(viewDescriptor);
		CompoundCommand cmd = new CompoundCommand("Drop new activity");
		System.out.println(">>>>>> DropObjectEditPolicy.getDropCommand() canExecute()=" + cmd.canExecute());
		return cmd;

	public boolean understandsRequest(Request request) {
		return RequestConstants.REQ_DROP_OBJECTS.equals(request.getType()) && request instanceof DropObjectsRequest;
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