org.eclipse.gef4.zest.examples.jface.GraphJFaceSnippet4.java Source code

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Here is the source code for org.eclipse.gef4.zest.examples.jface.GraphJFaceSnippet4.java

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/*******************************************************************************
 * 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.gef4.zest.examples.jface;

import java.util.Iterator;

import org.eclipse.gef4.zest.core.viewers.GraphViewer;
import org.eclipse.gef4.zest.core.viewers.IGraphContentProvider;
import org.eclipse.gef4.zest.layouts.algorithms.SpringLayoutAlgorithm;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class GraphJFaceSnippet4 {
    static class MyContentProvider implements IGraphContentProvider {

        public Object getDestination(Object rel) {
            if ("Rock2Paper".equals(rel)) {
                return "Rock";
            } else if ("Paper2Scissors".equals(rel)) {
                return "Paper";
            } else if ("Scissors2Rock".equals(rel)) {
                return "Scissors";
            }
            return null;
        }

        public Object[] getElements(Object input) {
            return new Object[] { "Rock2Paper", "Paper2Scissors", "Scissors2Rock" };
        }

        public Object getSource(Object rel) {
            if ("Rock2Paper".equals(rel)) {
                return "Paper";
            } else if ("Paper2Scissors".equals(rel)) {
                return "Scissors";
            } else if ("Scissors2Rock".equals(rel)) {
                return "Rock";
            }
            return null;
        }

        public double getWeight(Object connection) {
            return 0;
        }

        public void dispose() {
        }

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

    }

    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) {
            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());
        viewer.setInput(new Object());
        viewer.addSelectionChangedListener(new ISelectionChangedListener() {

            public void selectionChanged(SelectionChangedEvent event) {
                System.out.println(
                        "Selection Changed: " + selectionToString((StructuredSelection) event.getSelection()));
            }

            private String selectionToString(StructuredSelection selection) {
                StringBuffer stringBuffer = new StringBuffer();
                Iterator iterator = selection.iterator();
                boolean first = true;
                while (iterator.hasNext()) {
                    if (first) {
                        first = false;
                    } else {
                        stringBuffer.append(" : ");
                    }
                    stringBuffer.append(iterator.next());
                }
                return stringBuffer.toString();
            }

        });
        shell.open();
        while (!shell.isDisposed()) {
            while (!d.readAndDispatch()) {
                d.sleep();
            }
        }

    }

}