Java tutorial
/******************************************************************************* * 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 * Zoltan Ujhelyi - update for connectionprovider *******************************************************************************/ package org.eclipse.gef4.zest.examples.jface; import java.util.Iterator; import org.eclipse.draw2d.ConnectionRouter; import org.eclipse.draw2d.IFigure; import org.eclipse.draw2d.ManhattanConnectionRouter; import org.eclipse.draw2d.PolygonDecoration; import org.eclipse.draw2d.RotatableDecoration; import org.eclipse.draw2d.geometry.PointList; import org.eclipse.gef4.zest.core.viewers.GraphViewer; import org.eclipse.gef4.zest.core.viewers.IConnectionStyleProvider; import org.eclipse.gef4.zest.core.viewers.IEntityConnectionStyleProvider; import org.eclipse.gef4.zest.core.viewers.IGraphContentProvider; import org.eclipse.gef4.zest.core.widgets.GraphConnection; import org.eclipse.gef4.zest.core.widgets.decoration.AbstractConnectionDecorator; import org.eclipse.gef4.zest.core.widgets.decoration.IConnectionDecorator; 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.Color; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; /** * This snippet shows how to use the {@link IConnectionRouterStyleProvider} * interface to set the connection router for some references. * * Based on {@link GraphJFaceSnippet4}. * * @author Zoltan Ujhelyi - update for connectionprovider * @author Ian Bull - original implementation * */ public class ConnectionDecorationJFaceSnippet { 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 MyConnectionRelationLabelProvider extends LabelProvider implements IConnectionStyleProvider { 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(); } /* Relation-based customization: IConnectionStyleProvider */ public ConnectionRouter getRouter(Object rel) { return null; } public int getConnectionStyle(Object rel) { return SWT.NONE; } public Color getColor(Object rel) { return null; } public Color getHighlightColor(Object rel) { return null; } public int getLineWidth(Object rel) { return -1; } public IFigure getTooltip(Object entity) { return null; } public IConnectionDecorator getConnectionDecorator(Object rel) { return new AbstractConnectionDecorator() { public RotatableDecoration createTargetDecoration(GraphConnection connection) { return null; } public RotatableDecoration createSourceDecoration(GraphConnection connection) { PolygonDecoration decoration = new PolygonDecoration(); PointList decorationPointList = new PointList(); decorationPointList.addPoint(0, 0); decorationPointList.addPoint(-2, 2); decorationPointList.addPoint(-4, 0); decorationPointList.addPoint(-2, -2); decoration.setTemplate(decorationPointList); return decoration; } }; } } static class MyEndpointEntityLabelProvider extends LabelProvider implements IEntityConnectionStyleProvider { 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(); } /* Endpoint-based customization: IEntityConnectionStyleProvider */ public ConnectionRouter getRouter(Object src, Object dest) { System.out.println(src + " -> " + dest); if (!(src.equals("Paper") && dest.equals("Rock"))) return new ManhattanConnectionRouter(); else return null; } public int getConnectionStyle(Object src, Object dest) { return SWT.NONE; } public Color getColor(Object src, Object dest) { return null; } public Color getHighlightColor(Object src, Object dest) { return null; } public int getLineWidth(Object src, Object dest) { return -1; } public IFigure getTooltip(Object src, Object dest) { return null; } } 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 MyConnectionRelationLabelProvider()); // MyEndpointEntityLabelProvider 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(); } } } }