/*******************************************************************************
* Copyright (c) 2006 Sybase, Inc. 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:
* Sybase, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.pagedesigner.editpolicies;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.Request;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.UnexecutableCommand;
import org.eclipse.gef.requests.ChangeBoundsRequest;
import org.eclipse.gef.requests.DropRequest;
import org.eclipse.jst.pagedesigner.commands.CloneNodeCommand;
import org.eclipse.jst.pagedesigner.commands.MoveNodeCommand;
import org.eclipse.jst.pagedesigner.dom.DOMPositionHelper;
import org.eclipse.jst.pagedesigner.dom.DOMUtil;
import org.eclipse.jst.pagedesigner.dom.IDOMPosition;
import org.eclipse.jst.pagedesigner.parts.NodeEditPart;
import org.eclipse.jst.pagedesigner.validation.caret.ActionData;
import org.eclipse.jst.pagedesigner.validation.caret.DnDPositionValidator;
import org.eclipse.jst.pagedesigner.validation.caret.DropActionData;
import org.eclipse.jst.pagedesigner.validation.caret.IPositionMediator;
import org.eclipse.jst.pagedesigner.validation.caret.DropActionData.DropData;
import org.eclipse.jst.pagedesigner.viewer.DesignPosition;
import org.eclipse.jst.pagedesigner.viewer.IDropLocationStrategy;
import org.eclipse.jst.pagedesigner.viewer.IHTMLGraphicalViewer;
import org.w3c.dom.Node;
/**
* @author mengbo
* @version 1.5
*/
public class DragMoveEditPolicy extends DropEditPolicy
{
/*
* (non-Javadoc)
*
* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#getCommand(org.eclipse.gef.Request)
*/
public final Command getCommand(Request request) {
if (!(request instanceof ChangeBoundsRequest)) {
return null;
}
ChangeBoundsRequest r = (ChangeBoundsRequest) request;
// we only support move/copy a single node.
if (!MoveSupport.isSingleNode(r)) {
return UnexecutableCommand.INSTANCE;
}
// the edit policy only handle at the target part, so only care about
// the
// target part request.
final Object type = r.getType();
if (type != REQ_ADD && type != REQ_CLONE && type != REQ_MOVE_CHILDREN) {
return null;
}
Node draggedNode = MoveSupport.getDraggedNode(r);
Node hostNode = ((NodeEditPart) getHost()).getIDOMNode();
if (DOMUtil.isAncester(draggedNode, hostNode)) {
return UnexecutableCommand.INSTANCE;
}
DesignPosition position = findPosition(r);
if (position == null || !position.isValid()) {
return null;
}
// can't move/copy into self.
Node node = position.getContainerNode();
if (DOMUtil.isAncester(draggedNode, node)) {
return UnexecutableCommand.INSTANCE;
}
// ok, we are about to move/copy into the specified position.
IDOMPosition domposition = DOMPositionHelper.toDOMPosition(position);
if (REQ_CLONE.equals(type)) {
return new CloneNodeCommand((IHTMLGraphicalViewer) getHost()
.getViewer(), domposition, draggedNode);
}
return new MoveNodeCommand((IHTMLGraphicalViewer) getHost()
.getViewer(), domposition, draggedNode);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#getTargetEditPart(org.eclipse.gef.Request)
*/
public EditPart getTargetEditPart(Request request) {
if (request instanceof ChangeBoundsRequest) {
return this.getHost();
}
return super.getTargetEditPart(request);
}
protected final DesignPosition findPosition(DropRequest r) {
final IPositionMediator mediator = getDropChildValidator(r);
if (mediator == null)
{
return null;
}
final IDropLocationStrategy dropStrategy = createDropLocationStrategy(r);
final DesignPosition position =
dropStrategy.calculateDesignPosition(getHost(), r.getLocation(), mediator);
// verify that the drop strategy has honoured it's contract that our
// mediator be respected
if (position != null)
{
if (!mediator.isValidPosition(position))
{
// if our mediator says no go, then veto the requestor
// there is no drop location
return null;
}
}
return position;
}
public void showTargetFeedback(Request request)
{
Object type = request.getType();
// only show feedback for these request types
if (type == REQ_ADD || type == REQ_CLONE
|| type == REQ_MOVE_CHILDREN || type == REQ_MOVE) {
super.showTargetFeedback(request);
}
}
protected final IPositionMediator createDefaultDropChildValidator(DropData r)
{
return new DnDPositionValidator(new DropActionData(
ActionData.COMPONENT_MOVE, r));
}
}