/*******************************************************************************
* 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.dnd.internal;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.RectangleFigure;
import org.eclipse.draw2d.geometry.Rectangle;
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.editpolicies.GraphicalEditPolicy;
import org.eclipse.jst.pagedesigner.dnd.FeedBackInfo;
import org.eclipse.jst.pagedesigner.dnd.ILocalDropHandler;
import org.eclipse.jst.pagedesigner.dnd.LocalDropRequest;
import org.eclipse.jst.pagedesigner.dom.DOMPositionHelper;
import org.eclipse.jst.pagedesigner.dom.IDOMPosition;
import org.eclipse.jst.pagedesigner.editpolicies.LocationHelper;
import org.eclipse.jst.pagedesigner.parts.ElementEditPart;
import org.eclipse.jst.pagedesigner.parts.NodeEditPart;
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.viewer.DesignPosition;
import org.eclipse.jst.pagedesigner.viewer.EditPartPositionHelper;
import org.eclipse.jst.pagedesigner.viewer.IHTMLGraphicalViewer;
import org.w3c.dom.Node;
/**
* This is the editpolicy to handle LocalSelectionDrop
*
* @author mengbo
*/
public class LocalDropEditPolicy extends GraphicalEditPolicy {
private RectangleFigure _feedbackFigure;
// indicate whether update is checked
private static boolean _checkUpdate = true;
/**
* @param widgetEditPart
* @param request
* @param results
* @return true if should update widget
*/
public boolean checkUpdateWidget(EditPart widgetEditPart,
LocalDropRequest request, Map results) {
if (!(widgetEditPart instanceof ElementEditPart)) {
return false;
}
Node widget = ((ElementEditPart) widgetEditPart).getIDOMNode();
ILocalDropHandler[] handlers = RegistryReader.getAllHandlers();
Object localData = request.getLocalObject();
for (int i = 0; i < handlers.length; i++) {
FeedBackInfo feedback = handlers[i].supportUpdateWidget(localData,
widget);
if (feedback != null) {
results.put(feedback, handlers[i]);
}
}
return !results.isEmpty();
}
/**
* @param request
* @param host
* @param results
* @param dpHolder
* @param position
* @return true if should insert element
*/
public boolean checkInsertElement(LocalDropRequest request,
EditPart[] host, Map results, DesignPosition[] dpHolder,
IDOMPosition[] position) {
DesignPosition designPosition = EditPartPositionHelper
.findEditPartPosition(host[0], request.getLocation(),
new DnDPositionValidator(new ActionData(
ActionData.DATABINDING_DND, request)));
dpHolder[0] = designPosition;
if (designPosition == null) {
return false;
}
host[0] = designPosition.getContainerPart();
position[0] = DOMPositionHelper.toDOMPosition(designPosition);
ILocalDropHandler[] handlers = RegistryReader.getAllHandlers();
Object localData = request.getLocalObject();
for (int i = 0; i < handlers.length; i++) {
FeedBackInfo feedback = handlers[i].supportInsertElements(
localData, position[0]);
if (feedback != null) {
results.put(feedback, handlers[i]);
}
}
return !results.isEmpty();
}
/*
* (non-Javadoc)
*
* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#getTargetEditPart(org.eclipse.gef.Request)
*/
public EditPart getTargetEditPart(Request request) {
if (request instanceof LocalDropRequest) {
LocalDropRequest r = (LocalDropRequest) request;
EditPart host = getHost();
if (_checkUpdate && checkUpdateWidget(host, r, new HashMap())) {
return host;
}
EditPart[] hostHolder = new EditPart[] { host };
if (checkInsertElement(r, hostHolder, new HashMap(),
new DesignPosition[1], new IDOMPosition[1])) {
return hostHolder[0];
}
}
return null;
}
/*
* (non-Javadoc)
*
* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#getCommand(org.eclipse.gef.Request)
*/
public Command getCommand(Request request) {
if (request instanceof LocalDropRequest) {
LocalDropRequest r = (LocalDropRequest) request;
EditPart host = getHost();
Map result = new HashMap();
if (_checkUpdate && checkUpdateWidget(host, r, result)) {
LocalDropCommand command = new LocalDropCommand(
getViewer(host), r.getLocalObject(), result);
command.setWidget(((NodeEditPart) host).getIDOMNode());
return command;
}
result.clear();
EditPart[] hostHolder = new EditPart[] { host };
IDOMPosition[] positionHolder = new IDOMPosition[1];
if (checkInsertElement(r, hostHolder, result,
new DesignPosition[1], positionHolder)) {
LocalDropCommand command = new LocalDropCommand(
getViewer(host), r.getLocalObject(), result);
command.setDOMPosition(positionHolder[0]);
return command;
}
}
return null;
}
/**
* @param host
* @return
*/
private IHTMLGraphicalViewer getViewer(EditPart host) {
return (IHTMLGraphicalViewer) ((GraphicalEditPart) host).getViewer();
}
/*
* (non-Javadoc)
*
* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#eraseTargetFeedback(org.eclipse.gef.Request)
*/
public void eraseTargetFeedback(Request request) {
if (_feedbackFigure != null) {
removeFeedback(_feedbackFigure);
_feedbackFigure = null;
}
}
/*
* (non-Javadoc)
*
* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#showTargetFeedback(org.eclipse.gef.Request)
*/
public void showTargetFeedback(Request request) {
if (request instanceof LocalDropRequest) {
LocalDropRequest r = (LocalDropRequest) request;
EditPart host = getHost();
if (_checkUpdate && checkUpdateWidget(host, r, new HashMap())) {
Rectangle rect = LocationHelper
.getAbsoluteBounds((GraphicalEditPart) host);
showFeedbackRect(rect);
return;
}
EditPart[] hostHolder = new EditPart[] { host };
DesignPosition[] holder = new DesignPosition[1];
if (checkInsertElement(r, hostHolder, new HashMap(), holder,
new IDOMPosition[1])) {
Rectangle rect = EditPartPositionHelper
.convertToAbsoluteCaretRect(holder[0]);
showFeedbackRect(rect);
if (getHost() instanceof GraphicalEditPart) {
ExposeHelper exposeHelper = new ExposeHelper(
getViewer(getHost()));
exposeHelper.adjustVertical(r.getLocation());
}
return;
}
}
}
/**
* @return the feedback figure
*/
protected RectangleFigure getFeedbackFigure() {
if (_feedbackFigure == null) {
_feedbackFigure = new RectangleFigure();
_feedbackFigure.setFill(true);
_feedbackFigure.setOutline(true);
_feedbackFigure.setLineWidth(1);
_feedbackFigure.setForegroundColor(ColorConstants.red);
_feedbackFigure.setBounds(new Rectangle(0, 0, 0, 0));
_feedbackFigure.setXOR(true);
addFeedback(_feedbackFigure);
}
return _feedbackFigure;
}
/**
* @param rect
*/
protected void showFeedbackRect(Rectangle rect) {
RectangleFigure pf = getFeedbackFigure();
pf.translateToRelative(rect);
pf.setBounds(rect);
}
/**
* @return Returns the _forUpdate.
*/
public static boolean isCheckUpdate() {
return _checkUpdate;
}
/**
* @param update
* The _forUpdate to set.
*/
public static void setCheckUpdate(boolean update) {
_checkUpdate = update;
}
}