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/*****************************************************************************
* Copyright (c) 2011 CEA LIST.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
*
* CEA LIST - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.uml.diagram.common.edit.policy;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.PositionConstants;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.gef.SnapToHelper;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.UnexecutableCommand;
import org.eclipse.gef.requests.ChangeBoundsRequest;
import org.eclipse.gmf.runtime.common.core.command.CompositeCommand;
import org.eclipse.gmf.runtime.common.core.command.ICommand;
import org.eclipse.gmf.runtime.diagram.ui.commands.ICommandProxy;
import org.eclipse.gmf.runtime.diagram.ui.commands.SetBoundsCommand;
import org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.CreationEditPolicy;
import org.eclipse.gmf.runtime.diagram.ui.l10n.DiagramUIMessages;
import org.eclipse.gmf.runtime.diagram.ui.requests.CreateViewRequest;
import org.eclipse.gmf.runtime.diagram.ui.requests.CreateViewRequest.ViewDescriptor;
import org.eclipse.gmf.runtime.emf.commands.core.command.CompositeTransactionalCommand;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.papyrus.gmf.diagram.common.commands.CreateViewCommand;
import org.eclipse.papyrus.gmf.diagram.common.edit.policy.DefaultCreationEditPolicy;
import org.eclipse.papyrus.infra.gmfdiag.common.snap.NodeSnapHelper;
import org.eclipse.papyrus.uml.diagram.common.locator.PortPositionLocator;
import org.eclipse.papyrus.uml.diagram.common.service.AspectUnspecifiedTypeCreationTool;
/**
* Replaces the {@link DefaultCreationEditPolicy} in order to manage Affixed Port position on creation or on drop.
*/
public class StructuredClassifierCreationEditPolicy extends CreationEditPolicy {
/**
* {@inheritDoc}
*/
@Override
protected Command getReparentCommand(ChangeBoundsRequest request) {
// Forbid re-parent in this edit policy (to be used by compartment)
// in order to avoid node to be moved in compartments.
return UnexecutableCommand.INSTANCE;
}
/**
* <pre>
* {@inheritDoc}
*
* The goal here is to create the view and to move it at the mouse location,
* respecting a given locator. It is assumed that only affixed Port can be created on
* edit part that have this edit policy, and the locator is a {@link PortPositionLocator}.
*
* @see DefaultCreationEditPolicy#getCreateCommand().
* </pre>
*/
@Override
protected Command getCreateCommand(CreateViewRequest request) {
// This overrides getCreateCommand in order to use a specific CreateViewCommand (instead of
// org.eclipse.gmf.runtime.diagram.ui.commands.CreateCommand.
// The original CreateCommand#canExecute() implementation rely on ViewProvider#provides(CreateViewForKindOperation op)
// method to know if a view can be created. The problem is that this method is incorrectly generated by GMF Tooling and should be avoided.
// CreateViewCommand replace the semantic adapter in its call to ViewService to know if a provider exists.
TransactionalEditingDomain editingDomain = ((IGraphicalEditPart)getHost()).getEditingDomain();
CompositeTransactionalCommand cc = new CompositeTransactionalCommand(editingDomain, DiagramUIMessages.AddCommand_Label);
Iterator<? extends ViewDescriptor> descriptors = request.getViewDescriptors().iterator();
while(descriptors.hasNext()) {
CreateViewRequest.ViewDescriptor descriptor = (CreateViewRequest.ViewDescriptor)descriptors.next();
ICommand createCommand = new CreateViewCommand(editingDomain, descriptor, (View)(getHost().getModel()));
// Add SetBounds
createCommand = CompositeCommand.compose(createCommand, getSetBoundsCommand(request, descriptor));
//
cc.compose(createCommand);
}
return new ICommandProxy(cc.reduce());
}
/**
* Get a SetBoundsCommand to move a new view at current mouse position.
*
* @param request
* The creation request.
* @param descriptor
* The descriptor of the new element.
* @return The set bounds command.
*/
private ICommand getSetBoundsCommand(CreateViewRequest request, CreateViewRequest.ViewDescriptor descriptor) {
ICommand setBoundsCommand = null;
TransactionalEditingDomain editingDomain = ((IGraphicalEditPart)getHost()).getEditingDomain();
// Retrieve parent location
Point parentLoc = getHostFigure().getBounds().getLocation().getCopy();
final Point realWantedLocation;
Map<?, ?> params = request.getExtendedData();
Point realLocation = (Point)params.get(AspectUnspecifiedTypeCreationTool.INITIAL_MOUSE_LOCATION_FOR_CREATION);
if(realLocation != null) {
realWantedLocation = realLocation.getCopy();
} else {
//we use this location to be able to create Port in the corners of the figure
realWantedLocation = request.getLocation().getCopy();
}
// Compute relative creation location
Point requestedLocation = realWantedLocation.getCopy();
getHostFigure().translateToRelative(requestedLocation);
// Create proposed creation bounds and use the locator to find the expected position
PortPositionLocator locator = new PortPositionLocator(getHostFigure(), PositionConstants.NONE);
final Rectangle preferredBounds = locator.getPreferredLocation(new Rectangle(requestedLocation, new Dimension(20, 20)));
Rectangle retainedBounds = preferredBounds.getCopy();
//find the current side of the wanted position
final Rectangle parentBounds = getHostFigure().getBounds().getCopy();
//break all!!! getHostFigure().translateToAbsolute(parentBounds);
locator.setConstraint(preferredBounds.getCopy().translate(parentBounds.getLocation().getNegated()));
int currentSide = locator.getCurrentSideOfParent();
if(request.isSnapToEnabled() && currentSide != PositionConstants.NORTH_EAST && currentSide != PositionConstants.NORTH_WEST && currentSide != PositionConstants.SOUTH_EAST && currentSide != PositionConstants.SOUTH_WEST) { //request for snap port at the creation
//we find the best location with snap
Point wantedPoint = preferredBounds.getLocation();
getHostFigure().translateToAbsolute(wantedPoint);
Rectangle portBounds = new Rectangle(wantedPoint, new Dimension(20, 20));
NodeSnapHelper helper = new NodeSnapHelper((SnapToHelper)getHost().getAdapter(SnapToHelper.class), portBounds, false, false, true);
final ChangeBoundsRequest tmpRequest = new ChangeBoundsRequest("move"); //$NON-NLS-1$
tmpRequest.setEditParts(Collections.emptyList());
tmpRequest.setSnapToEnabled(true);
tmpRequest.setLocation(portBounds.getLocation());
helper.snapPoint(tmpRequest);
preferredBounds.translate(tmpRequest.getMoveDelta());
switch(currentSide) {
case PositionConstants.NORTH:
case PositionConstants.SOUTH:
preferredBounds.y = retainedBounds.y;
break;
case PositionConstants.EAST:
case PositionConstants.WEST:
preferredBounds.x = retainedBounds.x;
break;
default:
break;
}
}
// Convert the calculated preferred bounds as relative to parent location
Rectangle creationBounds = preferredBounds.getTranslated(parentLoc.getNegated());
setBoundsCommand = new SetBoundsCommand(editingDomain, DiagramUIMessages.SetLocationCommand_Label_Resize, descriptor, creationBounds);
return setBoundsCommand;
}
/**
* Convenience method to return the host's Figure.
*
* @return The host GraphicalEditPart's Figure
*/
private IFigure getHostFigure() {
return ((GraphicalEditPart)getHost()).getFigure();
}
}
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