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/******************************************************************************
* Copyright (c) 2007, 2016 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
****************************************************************************/
package org.eclipse.sirius.diagram.ui.tools.internal.ruler;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.gef.EditPartViewer;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.gef.SnapToGeometry;
import org.eclipse.gef.SnapToGrid;
import org.eclipse.gef.SnapToHelper;
import org.eclipse.gef.rulers.RulerProvider;
import org.eclipse.gmf.runtime.diagram.ui.editparts.DiagramEditPart;
import org.eclipse.gmf.runtime.diagram.ui.internal.editparts.ISurfaceEditPart;
import org.eclipse.gmf.runtime.diagram.ui.internal.ruler.CompoundSnapToHelperEx;
import org.eclipse.gmf.runtime.diagram.ui.internal.ruler.SnapToGridEx;
import org.eclipse.gmf.runtime.diagram.ui.internal.ruler.SnapToGuidesEx;
import org.eclipse.gmf.runtime.diagram.ui.internal.ruler.SnapToHelperUtil;
import org.eclipse.sirius.diagram.ui.edit.api.part.AbstractDiagramNodeEditPart;
/**
* Utility class for the snapping behavior. This class adds the capability to
* snap to all visible figures.
*
* @author <a href="mailto:laurent.redor@obeo.fr">Laurent Redor</a>
*/
public class SiriusSnapToHelperUtil extends SnapToHelperUtil {
// CHECKSTYLE:OFF Method duplicate from SnapToHelperUtil and not formatted
// to facilitate comparison.
/**
* returns the the appropriate snap helper(s), this method will always reach
* for the first reachable DiagramEditPart using the passed edit part, then
* use this Diagram edit part to get the snap helper
*
* @param editPart
* , edit part to get the snap helper for
* @return
*/
static public Object getSnapHelper(GraphicalEditPart editPart) {
// get the diagram Edit Part
GraphicalEditPart diagramEditPart = editPart;
while (diagramEditPart != null && !(diagramEditPart instanceof DiagramEditPart)) {
diagramEditPart = (GraphicalEditPart) diagramEditPart.getParent();
}
if (diagramEditPart == null) {
return null;
}
// for snap to geometry, attempt to locate a compartment as a parent
GraphicalEditPart parent = editPart;
// If the editPart is an AbstractDiagramNodeEditPart, this means that
// element to snap is a border node of a DNode, this is an exception
// where we do not attempt to locate a compartment as a parent.
if (!(parent instanceof AbstractDiagramNodeEditPart)) {
while (parent != null && !(parent instanceof ISurfaceEditPart)) {
parent = (GraphicalEditPart) parent.getParent();
}
}
if (parent == null) {
parent = diagramEditPart;
}
List<SnapToHelper> snapStrategies = new ArrayList<SnapToHelper>();
EditPartViewer viewer = diagramEditPart.getViewer();
Boolean val = (Boolean) viewer.getProperty(RulerProvider.PROPERTY_RULER_VISIBILITY);
if (val != null && val.booleanValue()) {
snapStrategies.add(new SnapToGuidesEx(diagramEditPart));
}
val = (Boolean) viewer.getProperty(SnapToGeometry.PROPERTY_SNAP_ENABLED);
if (val != null && val.booleanValue()) {
snapStrategies.add(new SiriusSnapToGeometry(parent));
}
val = (Boolean) viewer.getProperty(SnapToGrid.PROPERTY_GRID_ENABLED);
if (val != null && val.booleanValue()) {
snapStrategies.add(new SnapToGridEx(diagramEditPart));
}
if (snapStrategies.size() == 0) {
return null;
}
if (snapStrategies.size() == 1) {
return snapStrategies.get(0);
}
SnapToHelper ss[] = new SnapToHelper[snapStrategies.size()];
for (int i = 0; i < snapStrategies.size(); i++) {
ss[i] = snapStrategies.get(i);
}
return new CompoundSnapToHelperEx(ss);
}
// CHECKSTYLE:ON
}
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