/*******************************************************************************
* 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.itemcreation;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.gef.Request;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.requests.DropRequest;
import org.eclipse.jst.pagedesigner.PDPlugin;
import org.eclipse.jst.pagedesigner.commands.CreateItemCommand;
import org.eclipse.jst.pagedesigner.dom.DOMPositionHelper;
import org.eclipse.jst.pagedesigner.dom.IDOMPosition;
import org.eclipse.jst.pagedesigner.editpolicies.DropEditPolicy;
import org.eclipse.jst.pagedesigner.tools.ExposeHelper;
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;
/**
* @author mengbo
*/
public class ItemCreationEditPolicy extends DropEditPolicy
{
/*
* (non-Javadoc)
*
* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#getCommand(org.eclipse.gef.Request)
*/
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;
}
// TagToolCreationAdapter tagToolCreationAdapter = new TagToolCreationAdapter(r.getTagToolPaletteEntry(), getViewer(getHost()).getModel());
return new CreateItemCommand(
PDPlugin
.getResourceString("ItemCreationEditPolicy.CommandLabel.CreateItem"),//$NON-NLS-1$
getViewer(getHost()).getModel(), domposition, r.getTagCreationProvider());
}
return null;
}
/*
* (non-Javadoc)
*
* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#getTargetEditPart(org.eclipse.gef.Request)
*/
public EditPart getTargetEditPart(Request request) {
if (request instanceof ItemCreationRequest) {
DesignPosition position = findPosition((ItemCreationRequest)request);
if (position == null) {
return null;
}
EditPart container = position.getContainerPart();
return container;
}
return null;
}
/**
* @param host
* @return the graphical viewer
*/
protected IHTMLGraphicalViewer getViewer(EditPart host) {
return (IHTMLGraphicalViewer) ((GraphicalEditPart) host).getViewer();
}
/*
* (non-Javadoc)
*
* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#showTargetFeedback(org.eclipse.gef.Request)
*/
public void showTargetFeedback(Request request)
{
if (request instanceof DropRequest
&& request.getType() == ItemCreationRequest.REQ_ITEM_CREATION)
{
super.showTargetFeedback(request);
if (getHost() instanceof GraphicalEditPart) {
ExposeHelper exposeHelper = new ExposeHelper(
getViewer(getHost()));
exposeHelper.adjustVertical(((DropRequest)request).getLocation());
}
}
}
protected DesignPosition findPosition(DropRequest request) {
final IPositionMediator mediator = getDropChildValidator(request);
if (mediator == null)
{
return null;
}
final IDropLocationStrategy dropStrategy = createDropLocationStrategy(request);
final DesignPosition position =
dropStrategy.calculateDesignPosition(getHost(), request.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;
}
protected final IPositionMediator createDefaultDropChildValidator(DropData data) {
return new DnDPositionValidator(new DropActionData(
ActionData.PALETTE_DND, data)); }
}