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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.commands.Command;
import org.eclipse.gef.commands.UnexecutableCommand;
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.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.CustomRegionResizeCommand;
import org.eclipse.papyrus.diagram.statemachine.custom.helpers.Zone;
import org.eclipse.papyrus.diagram.statemachine.edit.parts.RegionEditPart;
public class CustomStateCompartmentXYLayoutEditPolicy extends XYLayoutEditPolicy {
/**
* This method analyzes a resize and/or move request and routes the call to
* the appropriate specific ResizeCommand either for a Region, 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
protected Command createChangeConstraintCommand(ChangeBoundsRequest request, EditPart child, Object constraint) {
// precautionary test
if((request == null) || (child == null) || (constraint == null))
throw new IllegalArgumentException();
if(child instanceof RegionEditPart) {
View region = (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)) {
return UnexecutableCommand.INSTANCE;
}
// now we face a resize command involving potentially multiple
// regions
TransactionalEditingDomain editingDomain = ((IGraphicalEditPart)getHost()).getEditingDomain();
CompositeTransactionalCommand cc = new CompositeTransactionalCommand(editingDomain, DiagramUIMessages.AddCommand_Label);
// a resize request, which we route to the specific ResizeCommand
IAdaptable adaptableForRegion = new SemanticAdapter(null, region);
CustomRegionResizeCommand resizeRegion = new CustomRegionResizeCommand(adaptableForRegion, ((IGraphicalEditPart)getHost()).getDiagramPreferencesHint(), editingDomain, DiagramUIMessages.CreateCommand_Label, request, (Rectangle)constraint);
cc.add(resizeRegion);
return new ICommandProxy(cc.reduce());
}
return super.createChangeConstraintCommand(request, child, constraint);
}
@Override
protected EditPolicy createChildEditPolicy(EditPart child) {
// specific resize edit policy for regions
// we want to avoid resize in oblique directions such as NORTH_EAST
// and restrict resize to inner expansion
// which do not cause a resize of the embedding statemachine
if(child instanceof RegionEditPart) {
CustomRegionResizableEditPolicy policy = new CustomRegionResizableEditPolicy();
// retrieve the region view
View region = (View)child.getModel();
// its zone property
String zone = Zone.getZone(region);
// test for allowed directions
int dirs = Zone.getAllowedResizeDirections(zone);
// constrain the edit policy with these directions
policy.setResizeDirections(dirs);
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);
}
}
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