modeleditpart.java

来自「一个eclipse插件源代码。用于web开发」· Java 代码 · 共 218 行

/*
 * $Header: /home/cvs/WEBPUMP2.0/WebPumpIDE_Src/WebPumpIDE/src/com/webpump/ui/gefmodule/edit/ModelEditPart.java,v 1.1.1.1 2004/07/01 09:07:47 wang_j Exp $
 * $Revision: 1.1.1.1 $
 * $Date: 2004/07/01 09:07:47 $
 *
 * ====================================================================
 *
 * The NanJing HopeRun(IT-FOREST) Software License, Version 2.0.0
 *
 * Copyright 2003-2004 by NanJing HopeRun(IT-FOREST) Information System Co., Ltd, CHINA and
 *                        IT Forest Corporation
 * All rights reserved.
 *
 * This software is the confidential and proprietary information of
 * HopeRun(IT-FOREST) Information System Co., Ltd, CHINA and IT Forest Corporation.
 * You shall not disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into with
 * HopeRun(IT-FOREST) Information System Co., Ltd, CHINA and IT Forest Corporation.
 */

package com.webpump.ui.gefmodule.edit;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.List;

import org.eclipse.draw2d.ConnectionAnchor;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.*;
import org.eclipse.gef.requests.DropRequest;

import com.webpump.ui.gefmodule.figure.NodeFigure;
import com.webpump.ui.gefmodule.model.ModelSubpart;
import com.webpump.ui.gefmodule.model.Task;

/**
 * Class for ModelEditPart
 * 
 * @author shi_l
 * @version 2.0.0 2004-5-30
 */
abstract public class ModelEditPart
	extends org.eclipse.gef.editparts.AbstractGraphicalEditPart
	implements NodeEditPart, PropertyChangeListener {

	/**accessible editpart*/
	private AccessibleEditPart acc;

	/**
	 * activate
	 */
	public void activate() {
		if (isActive())
			return;
		super.activate();
		getModelSubpart().addPropertyChangeListener(this);
	}

	/**
	 * create edit policies
	 */
	protected void createEditPolicies() {
		installEditPolicy(EditPolicy.COMPONENT_ROLE, new ModelElementEditPolicy());
		installEditPolicy(EditPolicy.GRAPHICAL_NODE_ROLE, new ModelNodeEditPolicy());
	}

	/**
	 * create accessible
	 * @return AccessibleEditPart
	 */
	abstract protected AccessibleEditPart createAccessible();

	/**
	 * Makes the EditPart insensible to changes in the model
	 * by removing itself from the model's list of listeners.
	 */
	public void deactivate() {
		if (!isActive())
			return;
		super.deactivate();
		getModelSubpart().removePropertyChangeListener(this);
	}

	/**
	 * get accessible editpart
	 */
	protected AccessibleEditPart getAccessibleEditPart() {
		if (acc == null)
			acc = createAccessible();
		return acc;
	}

	/**
	 * Returns the model associated with this as a ModelSubpart.
	 *
	 * @return  The model of this as a ModelSubpart.
	 */
	protected ModelSubpart getModelSubpart() {
		return (ModelSubpart) getModel();
	}

	/**
	 * Returns a list of connections for which this is the 
	 * source.
	 *
	 * @return List of connections.
	 */
	protected List getModelSourceConnections() {
		return getModelSubpart().getSourceConnections();
	}

	/**
	 * Returns a list of connections for which this is the 
	 * target.
	 *
	 * @return  List of connections.
	 */
	protected List getModelTargetConnections() {
		return getModelSubpart().getTargetConnections();
	}

	/** 
	 * Returns the Figure of this, as a node type figure.
	 *
	 * @return  Figure as a NodeFigure.
	 */
	protected NodeFigure getNodeFigure() {
		return (NodeFigure) getFigure();
	}

	/**
	 * Returns the connection anchor for the given
	 * ConnectionEditPart's source. 
	 *
	 * @return  ConnectionAnchor.
	 */
	public ConnectionAnchor getSourceConnectionAnchor(ConnectionEditPart connEditPart) {
		Task task = (Task) connEditPart.getModel();
		return getNodeFigure().getConnectionAnchor(task.getSourceTerminal());
	}

	/**
	 * Returns the connection anchor of a source connection which
	 * is at the given point.
	 * 
	 * @return  ConnectionAnchor.
	 */
	public ConnectionAnchor getSourceConnectionAnchor(Request request) {
		Point pt = new Point(((DropRequest) request).getLocation());
		return getNodeFigure().getSourceConnectionAnchorAt(pt);
	}

	/**
	 * Returns the connection anchor for the given 
	 * ConnectionEditPart's target.
	 *
	 * @return  ConnectionAnchor.
	 */
	public ConnectionAnchor getTargetConnectionAnchor(ConnectionEditPart connEditPart) {
		Task task = (Task) connEditPart.getModel();
		return getNodeFigure().getConnectionAnchor(task.getTargetTerminal());
	}

	/**
	 * Returns the connection anchor of a terget connection which
	 * is at the given point.
	 *
	 * @return  ConnectionAnchor.
	 */
	public ConnectionAnchor getTargetConnectionAnchor(Request request) {
		Point pt = new Point(((DropRequest) request).getLocation());
		return getNodeFigure().getTargetConnectionAnchorAt(pt);
	}

	/**
	 * Returns the name of the given connection anchor.
	 *
	 * @return  The name of the ConnectionAnchor as a String.
	 */
	final protected String mapConnectionAnchorToTerminal(ConnectionAnchor c) {
		return getNodeFigure().getConnectionAnchorName(c);
	}

	/**
	 * Handles changes in properties of this. It is 
	 * activated through the PropertyChangeListener.
	 * It updates children, source and target connections,
	 * and the visuals of this based on the property
	 * changed.
	 *
	 * @param evt  Event which details the property change.
	 */
	public void propertyChange(PropertyChangeEvent evt) {
		String prop = evt.getPropertyName();
		if (ModelSubpart.CHILDREN.equals(prop))
			refreshChildren();
		else if (ModelSubpart.INPUTS.equals(prop))
			refreshTargetConnections();
		else if (ModelSubpart.OUTPUTS.equals(prop))
			refreshSourceConnections();
		else if (prop.equals(ModelSubpart.ID_SIZE) || prop.equals(ModelSubpart.ID_LOCATION))
			refreshVisuals();
	}

	/**
	 * Updates the visual aspect of this. 
	 */
	protected void refreshVisuals() {
		Point loc = getModelSubpart().getLocation();
		Dimension size = getModelSubpart().getSize();
		Rectangle r = new Rectangle(loc, size);

		((GraphicalEditPart) getParent()).setLayoutConstraint(this, getFigure(), r);
	}
}