Bendpoint随着图元位置的变化而变化
我这里以gef.tutorial.step为例，在此工程基础修改代码实现该功能
首先将ContentsEditPart的布局做如下调整
protected IFigure createFigure() {Layer figure = new Layer() {public void paint(Graphics graphics) {graphics.setAntialias(SWT.ON);graphics.setTextAntialias(SWT.ON);super.paint(graphics);}};figure.setLayoutManager(new XYLayout());ConnectionLayer layer = (ConnectionLayer) getLayer(LayerConstants.CONNECTION_LAYER);layer.setConnectionRouter(ConnectionRouter.NULL);return figure;}然后实现连线转折点模型：
/******************************************************************************* * Copyright (c) 2005-2011, Chinese Eclipse Community(CEC) 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.ceclipse.org * * Contributors: * Ming.He <heming@ceclipse.com> - initial API and implementation *******************************************************************************/package gef.tutorial.step.parts;import java.io.Serializable;import org.eclipse.draw2d.Bendpoint;import org.eclipse.draw2d.geometry.Dimension;import org.eclipse.draw2d.geometry.Point;/** * TODO 此处填写 class 信息 * * @author Ming.He * @date 2011-4-15 */public class ConnectionBendpoint implements Serializable, Bendpoint {/** * */private static final long serialVersionUID = 1L;private float weight = 0.5f; private Dimension d1 = null; private Dimension d2 = null; public ConnectionBendpoint() { // ignore } public ConnectionBendpoint(Dimension dim1, Dimension dim2) { d1 = dim1; d2 = dim2; } public Dimension getFirstRelativeDimension() { return d1; } public Point getLocation() { return null; } public Dimension getSecondRelativeDimension() { return d2; } public float getWeight() { return weight; } public void setRelativeDimensions(Dimension dim1, Dimension dim2) { d1 = dim1; d2 = dim2; } public void setWeight(float w) { weight = w; }}在来实现Command：
关于转折点的命令这里做了个基类以便添加删除移动实现的方便BendpointCommand：
/******************************************************************************* * Copyright (c) 2005-2011, Chinese Eclipse Community(CEC) 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.ceclipse.org * * Contributors: * Ming.He <heming@ceclipse.com> - initial API and implementation *******************************************************************************/package gef.tutorial.step.commands;import gef.tutorial.step.model.AbstractConnectionModel;import org.eclipse.draw2d.geometry.Dimension;import org.eclipse.draw2d.geometry.Point;import org.eclipse.gef.commands.Command;/** * TODO 此处填写 class 信息 * * @author Ming.He * @date 2011-4-15 */public class BendpointCommand extends Command {protected int index = 0;protected Point location = null;protected AbstractConnectionModel connectionModel = null;private Dimension d1 = null;private Dimension d2 = null;protected Dimension getFirstRelativeDimension() {return d1;}protected Dimension getSecondRelativeDimension() {return d2;}protected int getIndex() {return index;}@SuppressWarnings("unused")protected Point getLocation() {return location;}protected AbstractConnectionModel getConnectionModel() {return connectionModel;}public void redo() {execute();}public void setRelativeDimensions(Dimension dim1, Dimension dim2) {d1 = dim1;d2 = dim2;}public void setIndex(int i) {index = i;}public void setLocation(Point p) {location = p;}public void setConnectionModel(AbstractConnectionModel connection) {connectionModel = connection;}}CreateBendpointCommand：
/******************************************************************************* * Copyright (c) 2005-2011, Chinese Eclipse Community(CEC) 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.ceclipse.org * * Contributors: * Ming.He <heming@ceclipse.com> - initial API and implementation *******************************************************************************/package gef.tutorial.step.commands;import gef.tutorial.step.parts.ConnectionBendpoint;/** * TODO 此处填写 class 信息 * * @author Ming.He * @date 2011-4-15 */public class CreateBendpointCommand extends BendpointCommand {public void execute() {ConnectionBendpoint rbp = new ConnectionBendpoint(getFirstRelativeDimension(), getSecondRelativeDimension());getConnectionModel().addBendpoint(getIndex(), rbp);super.execute();}public void undo() {super.undo();getConnectionModel().removeBendpoint(getIndex());}}MoveBendpointCommand：
/******************************************************************************* * Copyright (c) 2005-2011, Chinese Eclipse Community(CEC) 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.ceclipse.org * * Contributors: * Ming.He <heming@ceclipse.com> - initial API and implementation *******************************************************************************/package gef.tutorial.step.commands;import gef.tutorial.step.parts.ConnectionBendpoint;/** * TODO 此处填写 class 信息 * * @author Ming.He * @date 2011-4-15 */public class MoveBendpointCommand extends BendpointCommand {private ConnectionBendpoint bendpoint = null;public void execute() {bendpoint = (ConnectionBendpoint) getConnectionModel().getBendpoints().get(getIndex());getConnectionModel().removeBendpoint(getIndex());super.execute();}public void undo() {super.undo();getConnectionModel().addBendpoint(getIndex(), bendpoint);}}DeleteBendpointCommand：
/******************************************************************************* * Copyright (c) 2005-2011, Chinese Eclipse Community(CEC) 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.ceclipse.org * * Contributors: * Ming.He <heming@ceclipse.com> - initial API and implementation *******************************************************************************/package gef.tutorial.step.commands;import gef.tutorial.step.parts.ConnectionBendpoint;/** * TODO 此处填写 class 信息 * * @author Ming.He * @date 2011-4-15 */public class DeleteBendpointCommand extends BendpointCommand {private ConnectionBendpoint bendpoint = null;public void execute() {bendpoint = (ConnectionBendpoint) getConnectionModel().getBendpoints().get(getIndex());getConnectionModel().removeBendpoint(getIndex());super.execute();}public void undo() {super.undo();getConnectionModel().addBendpoint(getIndex(), bendpoint);}}对应的Plicy做如下修改：
/******************************************************************************* * Copyright (c) 2005-2011, Chinese Eclipse Community(CEC) 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.ceclipse.org * * Contributors: * Ming.He <heming@ceclipse.com> - initial API and implementation *******************************************************************************/package gef.tutorial.step.policies;import gef.tutorial.step.commands.BendpointCommand;import gef.tutorial.step.commands.CreateBendpointCommand;import gef.tutorial.step.commands.DeleteBendpointCommand;import gef.tutorial.step.commands.MoveBendpointCommand;import gef.tutorial.step.model.AbstractConnectionModel;import org.eclipse.draw2d.Connection;import org.eclipse.draw2d.geometry.Point;import org.eclipse.gef.commands.Command;import org.eclipse.gef.editpolicies.BendpointEditPolicy;import org.eclipse.gef.requests.BendpointRequest;/** * TODO 此处填写 class 信息 * * @author Ming.He * @date 2011-4-15 */public class CustomBendpointEditPolicy extends BendpointEditPolicy {protected Command getCreateBendpointCommand(BendpointRequest request) { CreateBendpointCommand command = new CreateBendpointCommand(); Point p = request.getLocation(); Connection conn = getConnection(); conn.translateToRelative(p); command.setLocation(p); Point ref1 = getConnection().getSourceAnchor().getReferencePoint(); Point ref2 = getConnection().getTargetAnchor().getReferencePoint(); conn.translateToRelative(ref1); conn.translateToRelative(ref2); command.setRelativeDimensions(p.getDifference(ref1), p.getDifference(ref2)); command.setConnectionModel((AbstractConnectionModel) request.getSource().getModel()); command.setIndex(request.getIndex()); return command;}protected Command getDeleteBendpointCommand(BendpointRequest request) { BendpointCommand command = new DeleteBendpointCommand(); Point p = request.getLocation(); command.setLocation(p); command.setConnectionModel((AbstractConnectionModel) request.getSource().getModel()); command.setIndex(request.getIndex()); return command;}protected Command getMoveBendpointCommand(BendpointRequest request) {// ??????bend???λ?? MoveBendpointCommand command = new MoveBendpointCommand(); Point p = request.getLocation(); Connection conn = getConnection(); conn.translateToRelative(p); command.setLocation(p); Point ref1 = getConnection().getSourceAnchor().getReferencePoint(); Point ref2 = getConnection().getTargetAnchor().getReferencePoint(); conn.translateToRelative(ref1); conn.translateToRelative(ref2); command.setRelativeDimensions(p.getDifference(ref1), p.getDifference(ref2)); command.setConnectionModel((AbstractConnectionModel) request.getSource().getModel()); command.setIndex(request.getIndex()); return command;}}