/*******************************************************************************
* Copyright (c) 2010 Oracle 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:
* Oracle Corporation - initial API and implementation and/or initial documentation
*******************************************************************************/
package org.eclipse.jst.pagedesigner.editpolicies;
import org.eclipse.gef.Request;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.requests.DropRequest;
import org.eclipse.jst.pagedesigner.IHTMLConstants;
import org.eclipse.jst.pagedesigner.PDPlugin;
import org.eclipse.jst.pagedesigner.commands.CreateItemCommand;
import org.eclipse.jst.pagedesigner.dom.DOMPosition;
import org.eclipse.jst.pagedesigner.dom.DOMPositionHelper;
import org.eclipse.jst.pagedesigner.dom.DOMRefPosition;
import org.eclipse.jst.pagedesigner.dom.IDOMPosition;
import org.eclipse.jst.pagedesigner.itemcreation.ItemCreationEditPolicy;
import org.eclipse.jst.pagedesigner.itemcreation.ItemCreationRequest;
import org.eclipse.jst.pagedesigner.parts.ElementEditPart;
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.w3c.dom.Node;
/**
*
*/
public class HeadItemCreationEditPolicy extends ItemCreationEditPolicy {
/**
* @param host
*/
public HeadItemCreationEditPolicy(ElementEditPart host) {
super();
setHost(host);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#getCommand(org.eclipse.gef.Request)
*/
@Override
public Command getCommand(Request request) {
if (request instanceof ItemCreationRequest) {
ItemCreationRequest r = (ItemCreationRequest) request;
DesignPosition position = findPosition((ItemCreationRequest)request);
if (position == null) {
return null;
}
IDOMPosition domposition = DOMPositionHelper.toDOMPosition(position);
if (domposition == null) {
return null;
}
// since the head tag is a widget, the offset will need
// to be updated in the position so that new node is
// appended to the list of children.
Node node = domposition.getContainerNode();
domposition = new DOMPosition(node, node.getChildNodes().getLength());
return new CreateItemCommand(
PDPlugin
.getResourceString("ItemCreationEditPolicy.CommandLabel.CreateItem"),//$NON-NLS-1$
getViewer(getHost()).getModel(), domposition, r.getTagCreationProvider());
}
return null;
}
@Override
protected IPositionMediator createDropChildValidator(DropRequest r) {
DropData dropData = createDropData(r);
if (dropData != null) {
MyDnDPositionValidator validator = new MyDnDPositionValidator(
new DropActionData(ActionData.PALETTE_DND, dropData));
return validator;
}
return null;
}
private static class MyDnDPositionValidator extends DnDPositionValidator {
public MyDnDPositionValidator(DropActionData dropActionData) {
super(dropActionData);
}
@Override
public boolean isValidPosition(IDOMPosition position) {
// if position is really a IDOMRefPosition, convert it to DOMPosition
Node node = null;
if (position instanceof DOMRefPosition) {
node = ((DOMRefPosition) position).getReferenceNode();
if (IHTMLConstants.TAG_HEAD.equalsIgnoreCase(node.getLocalName())) {
return true;
}
} else {
node = position.getContainerNode();
if (IHTMLConstants.TAG_HEAD.equalsIgnoreCase(node.getLocalName())) {
return true;
}
}
return super.isValidPosition(position);
}
}
}