/*******************************************************************************
 * Copyright 2005-2007, CHISEL Group, University of Victoria, Victoria, BC,
 * Canada. 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: The Chisel Group, University of Victoria
 ******************************************************************************/
package org.eclipse.zest.tests.jface;


import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.zest.core.viewers.EntityConnectionData;
import org.eclipse.zest.core.viewers.GraphViewer;
import org.eclipse.zest.core.viewers.IGraphEntityContentProvider;
import org.eclipse.zest.core.viewers.INestedContentProvider;
import org.eclipse.zest.layouts.LayoutStyles;
import org.eclipse.zest.layouts.algorithms.SpringLayoutAlgorithm;

/**
 * This snippet shows how to use the INestedGraphContentProvider to create a graph
 * with Zest. In this example, getElements returns 3 edges: * Rock2Paper *
 * Paper2Scissors * Scissors2Rock
 * 
 * And for each of these, the source and destination are returned in getSource
 * and getDestination.
 * 
 * A label provider is also used to create the text and icons for the graph.
 * 
 * @author Ian Bull
 * 
 */
public class GraphJFaceSnippet6 {

	static class MyContentProvider implements IGraphEntityContentProvider, INestedContentProvider {

		public Object[] getConnectedTo(Object entity) {
			if (entity.equals("First")) {
				return new Object[] { "Second" };
			}
			if (entity.equals("Second")) {
				return new Object[] { "Third", "rock" };
			}
			if (entity.equals("Third")) {
				return new Object[] { "First" };
			}
			if ( entity.equals("rock")) {
				return new Object[] { "paper" };
			}
			return null;
		}

		public Object[] getElements(Object inputElement) {
			return new String[] { "First", "Second", "Third" };
		}

		public double getWeight(Object entity1, Object entity2) {
			return 0;
		}

		public void dispose() {

		}

		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {

		}

		public Object[] getChildren(Object element) {
			// TODO Auto-generated method stub
			return new Object[] {"rock", "paper", "scissors"};
		}

		public boolean hasChildren(Object element) {
			// TODO Auto-generated method stub
			if ( element.equals("First")) return true;
			return false;
		}

	}

	static class MyLabelProvider extends LabelProvider {
		final Image image = Display.getDefault().getSystemImage(SWT.ICON_WARNING);

		public Image getImage(Object element) {
			if (element.equals("Rock") || element.equals("Paper") || element.equals("Scissors")) {
				return image;
			}
			return null;
		}

		public String getText(Object element) {
			if ( element instanceof EntityConnectionData ) return "";
			return element.toString();
		}

	}

	static GraphViewer viewer = null;

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Display d = new Display();
		Shell shell = new Shell(d);
		shell.setText("GraphJFaceSnippet2");
		shell.setLayout(new FillLayout(SWT.VERTICAL));
		shell.setSize(400, 400);
		viewer = new GraphViewer(shell, SWT.NONE);
		viewer.setContentProvider(new MyContentProvider());
		viewer.setLabelProvider(new MyLabelProvider());
		viewer.setLayoutAlgorithm(new SpringLayoutAlgorithm(LayoutStyles.NO_LAYOUT_NODE_RESIZING));
		viewer.setInput(new Object());
		
		Button button = new Button(shell, SWT.PUSH);
		button.setText("push");
		button.addSelectionListener(new SelectionListener() {

			public void widgetDefaultSelected(SelectionEvent e) {
			}

			public void widgetSelected(SelectionEvent e) {
				viewer.setInput(new Object());
			}
			
		});
		shell.open();
		while (!shell.isDisposed()) {
			while (!d.readAndDispatch()) {
				d.sleep();
			}
		}

	}

}