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/*******************************************************************************
* Copyright (c) 2012 CEA LIST.
*
* 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
*******************************************************************************/
package org.eclipse.papyrus.uml.diagram.timing.custom.edit.policies;
import java.util.ArrayList;
import java.util.List;
import java.util.Map.Entry;
import java.util.TreeMap;
import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.RectangleFigure;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.EditPolicy;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.gef.Request;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.CompoundCommand;
import org.eclipse.gef.commands.UnexecutableCommand;
import org.eclipse.gef.requests.ChangeBoundsRequest;
import org.eclipse.gef.requests.CreateRequest;
import org.eclipse.gmf.runtime.diagram.ui.commands.ICommandProxy;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.ConstrainedToolbarLayoutEditPolicy;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.NonResizableEditPolicyEx;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.papyrus.uml.diagram.timing.custom.edit.commands.RefreshCommandForDo;
import org.eclipse.papyrus.uml.diagram.timing.custom.edit.commands.RefreshCommandForUndo;
import org.eclipse.papyrus.uml.diagram.timing.custom.utils.FigureUtils;
import org.eclipse.papyrus.uml.diagram.timing.custom.utils.ViewUtils;
/**
* Handles re-ordering Views inside their compartment through drag&drop. This policy is meant to be installed on a list
* compartment.
*/
// meant to be overridden
@SuppressWarnings("static-method")
public class GenericListCompartmentLayoutEditPolicy extends ConstrainedToolbarLayoutEditPolicy {
private static final int LAYOUT_FEEDBACK_HEIGHT = 4;
private static final int MARGIN_BEFORE_FIRST = 4;
private static final int MARGIN_AFTER_LAST = 4;
protected IFigure layoutFeedbackFigure = null;
protected GraphicalEditPart getEditPartToRefresh() {
return (GraphicalEditPart)getHost();
}
protected int getLayoutFeedbackHeight() {
return LAYOUT_FEEDBACK_HEIGHT;
}
@Override
protected EditPolicy createChildEditPolicy(final EditPart child) {
EditPolicy result = child.getEditPolicy(EditPolicy.PRIMARY_DRAG_ROLE);
if(result == null) {
// add an edit policy so that children can be moved
result = new NonResizableEditPolicyEx();
}
return result;
}
@Override
protected Command getMoveChildrenCommand(final Request request) {
if(request instanceof ChangeBoundsRequest) {
final ChangeBoundsRequest changeBoundsRequest = (ChangeBoundsRequest)request;
final InsertionPoint insertionPoint = computeClosestInsertionPoint(changeBoundsRequest.getLocation().y);
if(insertionPoint == null) {
return UnexecutableCommand.INSTANCE;
}
final GraphicalEditPart hostEditPart = (GraphicalEditPart)getHost();
final View compartmentView = (View)hostEditPart.getModel();
@SuppressWarnings("unchecked")
final List<EditPart> editParts = changeBoundsRequest.getEditParts();
for(final EditPart editPart : editParts) {
if(editPart instanceof GraphicalEditPart) {
final GraphicalEditPart graphicalEditPart = (GraphicalEditPart)editPart;
final View view = (View)graphicalEditPart.getModel();
final GraphicalEditPart editPartToRefresh = getEditPartToRefresh();
final CompoundCommand compoundCommand = new CompoundCommand();
compoundCommand.add(new RefreshCommandForUndo(editPartToRefresh));
compoundCommand.add(new ICommandProxy(ViewUtils.getMoveViewCommand(compartmentView, view, insertionPoint.getIndex())));
compoundCommand.add(new RefreshCommandForDo(editPartToRefresh));
return compoundCommand;
}
}
}
return null;
}
@Override
protected void showLayoutTargetFeedback(final Request request) {
if(request instanceof ChangeBoundsRequest) {
eraseLayoutTargetFeedback();
final ChangeBoundsRequest changeBoundsRequest = (ChangeBoundsRequest)request;
final InsertionPoint insertionPoint = computeClosestInsertionPoint(changeBoundsRequest.getLocation().y);
if(insertionPoint == null) {
return;
}
final Rectangle containerBounds = new Rectangle(getHostFigure().getBounds());
getHostFigure().translateToAbsolute(containerBounds);
final int layoutFeedbackHeight = getLayoutFeedbackHeight();
final Rectangle feedbackBounds = new Rectangle(containerBounds.x, insertionPoint.getLocation() - layoutFeedbackHeight / 2, containerBounds.width, layoutFeedbackHeight);
final Point origin = FigureUtils.getLayeredPaneOrigin(getHostFigure());
feedbackBounds.translate(origin);
final double scale = FigureUtils.getScale(getHostFigure());
feedbackBounds.width *= scale;
feedbackBounds.height *= scale;
this.layoutFeedbackFigure = createLayoutTargetFeedbackFigure(feedbackBounds);
}
}
protected class InsertionPoint {
int index;
int location;
public InsertionPoint(final int index, final int location) {
this.index = index;
this.location = location;
}
public int getIndex() {
return this.index;
}
public int getLocation() {
return this.location;
}
}
protected InsertionPoint computeClosestInsertionPoint(final int offset) {
@SuppressWarnings("unchecked")
final List<GraphicalEditPart> children = getHost().getChildren();
if(children.isEmpty()) {
return null;
}
final List<InsertionPoint> insertionPoints = computeInsertionPoints(children);
final TreeMap<Integer, InsertionPoint> distanceMap = new TreeMap<Integer, InsertionPoint>();
for(final InsertionPoint insertionPoint : insertionPoints) {
final int distance = Math.abs(offset - insertionPoint.getLocation());
distanceMap.put(Integer.valueOf(distance), insertionPoint);
}
final Entry<Integer, InsertionPoint> firstEntry = distanceMap.firstEntry();
return firstEntry.getValue();
}
protected int getMarginBeforeFirst() {
return MARGIN_BEFORE_FIRST;
}
protected int getMarginAfterLast() {
return MARGIN_AFTER_LAST;
}
protected List<InsertionPoint> computeInsertionPoints(final List<GraphicalEditPart> children) {
final int size = children.size();
final List<InsertionPoint> insertionPoints = new ArrayList<GenericListCompartmentLayoutEditPolicy.InsertionPoint>();
Rectangle previousBounds = null;
for(int i = 0; i < size; i++) {
final GraphicalEditPart childEditPart = children.get(i);
final Rectangle bounds = new Rectangle(childEditPart.getFigure().getBounds());
getHostFigure().translateToAbsolute(bounds);
if(previousBounds != null) {
// an insertion point between two figures
insertionPoints.add(new InsertionPoint(i, (previousBounds.y + previousBounds.height + bounds.y) / 2));
} else {
// an insertion point before the first figure
insertionPoints.add(new InsertionPoint(i, bounds.y - getMarginBeforeFirst()));
}
if(i == size - 1) {
// last insertion point: after the last figure
insertionPoints.add(new InsertionPoint(i + 1, bounds.y + bounds.height + getMarginAfterLast()));
}
previousBounds = bounds;
}
return insertionPoints;
}
protected IFigure createLayoutTargetFeedbackFigure(final Rectangle bounds) {
final RectangleFigure r = new RectangleFigure();
r.setForegroundColor(ColorConstants.darkBlue);
r.setBackgroundColor(ColorConstants.lightBlue);
r.setBounds(bounds);
r.validate();
addFeedback(r);
return r;
}
@Override
protected void eraseLayoutTargetFeedback(final Request request) {
eraseLayoutTargetFeedback();
}
protected void eraseLayoutTargetFeedback() {
if(this.layoutFeedbackFigure != null) {
removeFeedback(this.layoutFeedbackFigure);
this.layoutFeedbackFigure = null;
}
}
@Override
protected Command getCreateCommand(final CreateRequest request) {
return null;
}
}
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