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/*****************************************************************************
* Copyright (c) 2014 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:
*
* Vincent Lorenzo (CEA LIST) vincent.lorenzo@cea.fr - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.infra.gmfdiag.common.editpolicies;
import java.util.Iterator;
import java.util.List;
import org.eclipse.draw2d.PositionConstants;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.PrecisionPoint;
import org.eclipse.draw2d.geometry.PrecisionRectangle;
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.NodeEditPart;
import org.eclipse.gef.SnapToHelper;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.CompoundCommand;
import org.eclipse.gef.requests.ChangeBoundsRequest;
import org.eclipse.gef.requests.CreateRequest;
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.CompartmentEditPart;
import org.eclipse.gmf.runtime.diagram.ui.editparts.DiagramRootEditPart;
import org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart;
import org.eclipse.gmf.runtime.diagram.ui.editparts.INodeEditPart;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.XYLayoutEditPolicy;
import org.eclipse.gmf.runtime.diagram.ui.figures.LayoutHelper;
import org.eclipse.gmf.runtime.diagram.ui.l10n.DiagramUIMessages;
import org.eclipse.gmf.runtime.diagram.ui.requests.CreateViewRequest;
import org.eclipse.gmf.runtime.emf.commands.core.command.CompositeTransactionalCommand;
import org.eclipse.papyrus.infra.core.services.ServiceException;
import org.eclipse.papyrus.infra.gmfdiag.common.Activator;
import org.eclipse.papyrus.infra.gmfdiag.common.helper.FixAnchorHelper;
import org.eclipse.papyrus.infra.gmfdiag.common.utils.ServiceUtilsForEditPart;
/**
*
* This edit policy allows to resize parent from NORTH, NORTH_WEST or WEST without moving its children
*
*/
public class XYLayoutWithConstrainedResizedEditPolicy extends XYLayoutEditPolicy {
private FixAnchorHelper helper = null;
/**
* Called in response to a <tt>REQ_CREATE</tt> request. Returns a command
* to set each created element bounds and auto-size properties.
*
* @param request
* a create request (understands instances of {@link CreateViewRequest}).
* @return a command to satisfy the request; <tt>null</tt> if the request is not
* understood.
*/
protected Command getCreateCommand(CreateRequest request) {
CreateViewRequest req = (CreateViewRequest)request;
TransactionalEditingDomain editingDomain = ((IGraphicalEditPart)getHost()).getEditingDomain();
CompositeTransactionalCommand cc = new CompositeTransactionalCommand(editingDomain, DiagramUIMessages.AddCommand_Label);
Iterator<?> iter = req.getViewDescriptors().iterator();
final Rectangle BOUNDS = (Rectangle)getConstraintFor(request);
boolean couldBeSnaped = request.getLocation().equals(LayoutHelper.UNDEFINED.getLocation()) && req.isSnapToEnabled();
while(iter.hasNext()) {
CreateViewRequest.ViewDescriptor viewDescriptor = (CreateViewRequest.ViewDescriptor)iter.next();
Rectangle rect = getBoundsOffest(req, BOUNDS, viewDescriptor);
//see bug 427129: Figures newly created via the palette should be snapped to grid if "snap to grid" is activated
if(couldBeSnaped) {
//this code fix the bug in some case...
int add = 0;
DiagramRootEditPart drep = (DiagramRootEditPart)getHost().getRoot();
double spacing = drep.getGridSpacing();
final double max_value = spacing * 20;
final SnapToHelper helper = (SnapToHelper)getHost().getAdapter(SnapToHelper.class);
final LayoutHelper layoutHelper = new LayoutHelper();
while(add < max_value) {//we define a max value to do test
Rectangle LOCAL_BOUNDS = BOUNDS.getCopy();
LOCAL_BOUNDS.translate(add, add);
Rectangle tmp_rect = getBoundsOffest(req, LOCAL_BOUNDS, viewDescriptor);
final PrecisionRectangle resultRect = new PrecisionRectangle(tmp_rect);
resultRect.setWidth(-1);
resultRect.setHeight(-1);
PrecisionPoint res1 = new PrecisionPoint(tmp_rect.getLocation());
helper.snapPoint(request, PositionConstants.NORTH_WEST, res1.getPreciseCopy(), res1);
final Point pt = layoutHelper.validatePosition(getHostFigure(), resultRect.setLocation(res1));
if(couldBeSnaped) {
if(pt.equals(resultRect.getLocation())) {
rect.setLocation(resultRect.getLocation());
break;
} else {
add += spacing;
continue;
}
}
}
}
// Default set bounds command.
cc.compose(new SetBoundsCommand(editingDomain, DiagramUIMessages.SetLocationCommand_Label_Resize, viewDescriptor, rect));
break;
}
if(cc.reduce() == null) {
return null;
}
return chainGuideAttachmentCommands(request, new ICommandProxy(cc.reduce()));
}
/**
* Returns the <code>Command</code> to resize a group of children.
*
* @param request
* the ChangeBoundsRequest
* @return the Command
*/
protected Command getChangeConstraintCommand(ChangeBoundsRequest request) {
final CompoundCommand resize = new CompoundCommand("Resize Command");//$NON-NLS-1$
IGraphicalEditPart child;
final List<?> children = request.getEditParts();
final int direction = request.getResizeDirection();
boolean isConstrainedResize = request.isConstrainedResize();
boolean forceLocation = isConstrainedResize && (direction == PositionConstants.WEST || direction == PositionConstants.NORTH || direction == PositionConstants.NORTH_WEST);
for(int i = 0; i < children.size(); i++) {
child = (IGraphicalEditPart)children.get(i);
resize.add(createChangeConstraintCommand(request, child, translateToModelConstraint(getConstraintFor(request, child))));
final Point move = request.getMoveDelta();
if(forceLocation) {
for(Object object : child.getChildren()) {
if(object instanceof CompartmentEditPart) {
final EditPolicy layoutPolicy = ((CompartmentEditPart)object).getEditPolicy(EditPolicy.LAYOUT_ROLE);
if(layoutPolicy instanceof org.eclipse.gef.editpolicies.XYLayoutEditPolicy) {
for(final Object current : ((CompartmentEditPart)object).getChildren()) {
if(current instanceof NodeEditPart) {
final ChangeBoundsRequest forceLocationRequest = new ChangeBoundsRequest();
forceLocationRequest.setType("move");//$NON-NLS-1$
forceLocationRequest.setMoveDelta(move.getNegated());
forceLocationRequest.setEditParts((EditPart)current);
final Command tmp = ((NodeEditPart)current).getCommand(forceLocationRequest);
if(tmp != null) {
resize.add(tmp);
}
}
}
}
}
}
}
//we add the command to fix the anchor
if(isConstrainedResize && child instanceof INodeEditPart) {
if(helper == null) {
TransactionalEditingDomain domain = null;
try {
domain = ServiceUtilsForEditPart.getInstance().getTransactionalEditingDomain(child);
} catch (ServiceException e) {
Activator.log.error(e);
}
this.helper = new FixAnchorHelper(domain);
}
final Command fixAnchorCommand = this.helper.getFixIdentityAnchorCommand((INodeEditPart)child, request.getMoveDelta(), request.getSizeDelta(), request.getResizeDirection());
if(fixAnchorCommand != null) {
resize.add(fixAnchorCommand);
}
}
}
return resize.unwrap();
}
}
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