/*******************************************************************************
 * Copyright (c) 2003, 2005 IBM 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.gef.examples.flow.parts;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.draw2d.AbstractLayout;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.draw2d.graph.CompoundDirectedGraph;
import org.eclipse.draw2d.graph.CompoundDirectedGraphLayout;

class GraphLayoutManager extends AbstractLayout {

private ActivityDiagramPart diagram;

GraphLayoutManager(ActivityDiagramPart diagram) {
	this.diagram = diagram;
}

protected Dimension calculatePreferredSize(IFigure container, int wHint, int hHint) {
	container.validate();
	List children = container.getChildren();
	Rectangle result =
		new Rectangle().setLocation(container.getClientArea().getLocation());
	for (int i = 0; i < children.size(); i++)
		result.union(((IFigure)children.get(i)).getBounds());
	result.resize(container.getInsets().getWidth(), container.getInsets().getHeight());
	return result.getSize();
}

public void layout(IFigure container) {
	GraphAnimation.recordInitialState(container);
	if (GraphAnimation.playbackState(container))
		return;

	CompoundDirectedGraph graph = new CompoundDirectedGraph();
	Map partsToNodes = new HashMap();
	diagram.contributeNodesToGraph(graph, null, partsToNodes);
	diagram.contributeEdgesToGraph(graph, partsToNodes);
	new CompoundDirectedGraphLayout().visit(graph);
	diagram.applyGraphResults(graph, partsToNodes);
}

}