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package org.eclipse.papyrus.diagram.statemachine.custom.policies;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.EditPolicy;
import org.eclipse.gef.Request;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.editpolicies.ResizableEditPolicy;
import org.eclipse.gef.requests.ChangeBoundsRequest;
import org.eclipse.gmf.runtime.diagram.ui.commands.ICommandProxy;
import org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.XYLayoutEditPolicy;
import org.eclipse.gmf.runtime.diagram.ui.l10n.DiagramUIMessages;
import org.eclipse.gmf.runtime.diagram.ui.requests.CreateUnspecifiedTypeConnectionRequest;
import org.eclipse.gmf.runtime.diagram.ui.requests.RequestConstants;
import org.eclipse.gmf.runtime.emf.commands.core.command.CompositeTransactionalCommand;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.papyrus.diagram.common.commands.SemanticAdapter;
import org.eclipse.papyrus.diagram.statemachine.custom.commands.CustomStateResizeCommand;
import org.eclipse.papyrus.diagram.statemachine.edit.parts.StateEditPart;
public class CustomRegionCompartmentXYLayoutEditPolicy extends XYLayoutEditPolicy {
/**
* This method analyzes a resize and/or move request and routes the call to
* the appropriate specific ResizeCommand either for a State
* in other cases passes on the call to the super class method.
*
* @param child
* the concerned EditPart
* @param constraint
* the object embedding the constraint rectangle
* @param request
* the ChangeBoundsRequest
*
* @return
*/
@Override
public Command createChangeConstraintCommand(ChangeBoundsRequest request, EditPart child, Object constraint) {
// precautionary test
if((request == null) || (child == null) || (constraint == null))
throw new IllegalArgumentException();
if(child instanceof StateEditPart) {
View state = (View)child.getModel();
// retrieve the deltas of the resize request
int dx = request.getSizeDelta().width;
int dy = request.getSizeDelta().height;
if((dx == 0) && (dy == 0)) {
// nothing to do except move the state edit part
// all locations of embedded figures are relative to it
// and thus hold when their container is moved around
return super.createChangeConstraintCommand(request, child, constraint);
}
// now we face a resize command
TransactionalEditingDomain editingDomain = ((IGraphicalEditPart)getHost()).getEditingDomain();
CompositeTransactionalCommand cc = new CompositeTransactionalCommand(editingDomain, DiagramUIMessages.AddCommand_Label);
// a resize request, which we route to the specific ResizeCommand
IAdaptable adaptableForState = new SemanticAdapter(null, state);
CustomStateResizeCommand resizeStateMachine = new CustomStateResizeCommand(adaptableForState, ((IGraphicalEditPart)getHost()).getDiagramPreferencesHint(), editingDomain, DiagramUIMessages.CreateCommand_Label, request, (Rectangle)constraint, false);
cc.add(resizeStateMachine);
return new ICommandProxy(cc.reduce());
}
return super.createChangeConstraintCommand(request, child, constraint);
}
@Override
protected EditPolicy createChildEditPolicy(EditPart child) {
// specific resize edit policy which correct ghost figure management by
// GMF
if(child instanceof StateEditPart) {
ResizableEditPolicy policy = new ResizableEditPolicy() {
public void eraseSourceFeedback(Request request) {
if(RequestConstants.REQ_DROP.equals(request.getType()))
eraseChangeBoundsFeedback((ChangeBoundsRequest)request);
else
super.eraseSourceFeedback(request);
}
};
return policy;
}
// all others, namely state machines and states, pseudostates, etc.
// will have the generic policy which allows resize in all directions
return super.createChildEditPolicy(child);
}
/**
*
* {@inheritedDoc}
*/
public EditPart getTargetEditPart(Request request) {
//this enables to make links when pointing inside a region
if(request instanceof CreateUnspecifiedTypeConnectionRequest)
return getHost().getParent().getParent().getParent();
else
return super.getTargetEditPart(request);
}
}
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