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/*******************************************************************************
* Copyright (c) 2001, 2007 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.wst.xsd.ui.internal.design.editpolicies;
import java.util.List;
import org.eclipse.draw2d.FigureCanvas;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.gef.EditPartViewer;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.gef.Request;
import org.eclipse.gef.requests.ChangeBoundsRequest;
import org.eclipse.wst.xsd.ui.internal.adapters.XSDBaseAttributeAdapter;
import org.eclipse.wst.xsd.ui.internal.adapters.XSDElementDeclarationAdapter;
import org.eclipse.wst.xsd.ui.internal.commands.BaseDragAndDropCommand;
import org.eclipse.wst.xsd.ui.internal.commands.XSDAttributeDragAndDropCommand;
import org.eclipse.wst.xsd.ui.internal.commands.XSDElementDragAndDropCommand;
import org.eclipse.wst.xsd.ui.internal.design.editparts.XSDBaseFieldEditPart;
public class DragAndDropEditPolicy extends org.eclipse.gef.editpolicies.GraphicalEditPolicy
{
protected EditPartViewer viewer;
protected SelectionHandlesEditPolicyImpl selectionHandlesEditPolicy;
public DragAndDropEditPolicy(EditPartViewer viewer, SelectionHandlesEditPolicyImpl selectionHandlesEditPolicy)
{
this.viewer = viewer;
this.selectionHandlesEditPolicy = selectionHandlesEditPolicy;
}
public boolean understandsRequest(Request req)
{
return true;
}
public org.eclipse.gef.commands.Command getCommand(Request request)
{
BaseDragAndDropCommand command = null;
if (request instanceof ChangeBoundsRequest)
{
ChangeBoundsRequest changeBoundsRequest = (ChangeBoundsRequest)request;
Point location = changeBoundsRequest.getLocation();
GraphicalEditPart target = (GraphicalEditPart)viewer.findObjectAt(location);
location = getPointerLocation(changeBoundsRequest.getLocation());
((GraphicalEditPart)viewer.getRootEditPart()).getFigure().translateToRelative(location);
List list = changeBoundsRequest.getEditParts();
// allow drag and drop of only one selected object
if (list.size() == 1)
{
Object itemToDrag = list.get(0);
if (itemToDrag instanceof XSDBaseFieldEditPart)
{
XSDBaseFieldEditPart selected = (XSDBaseFieldEditPart) itemToDrag;
if (selected.getModel() instanceof XSDElementDeclarationAdapter)
{
command = new XSDElementDragAndDropCommand(viewer, (ChangeBoundsRequest)request, target, selected, location);
selectionHandlesEditPolicy.setDragAndDropCommand(command);
}
else if (selected.getModel() instanceof XSDBaseAttributeAdapter)
{
command = new XSDAttributeDragAndDropCommand(viewer, (ChangeBoundsRequest)request, target, selected, location);
selectionHandlesEditPolicy.setDragAndDropCommand(command);
}
}
}
}
return command;
}
protected Point getPointerLocation(Point origPointerLocation)
{
Point compensatedLocation = origPointerLocation;
FigureCanvas figureCanvas = (FigureCanvas) viewer.getControl();
int yOffset = figureCanvas.getViewport().getVerticalRangeModel().getValue();
int xOffset = figureCanvas.getViewport().getHorizontalRangeModel().getValue();
compensatedLocation.y = compensatedLocation.y + yOffset;
compensatedLocation.x = compensatedLocation.x + xOffset;
return compensatedLocation;
}
}
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