connection.java

mywork是rcp开发的很好的例子

/*******************************************************************************
 * Copyright (c) 2004, 2005 Elias Volanakis and others.
�* 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:
�*����Elias Volanakis - initial API and implementation
�*******************************************************************************/
package net.sf.freenote.model;

import net.sf.freenote.FreeNoteConstants;
import net.sf.freenote.directedit.DirectEditable;

import org.eclipse.draw2d.Graphics;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.ui.views.properties.ColorPropertyDescriptor;
import org.eclipse.ui.views.properties.ComboBoxPropertyDescriptor;
import org.eclipse.ui.views.properties.IPropertyDescriptor;
import org.eclipse.ui.views.properties.TextPropertyDescriptor;

/**
 * A connection between two distinct shapes.
 * 
 * @author Elias Volanakis
 */
public class Connection extends ModelElement implements DirectEditable {
	public static final String LINESTYLE_PROP = "LineStyle";
	private static IPropertyDescriptor[] descriptors;
	private String desc = "";

	/** True, if the connection is attached to its endpoints. */
	private boolean isConnected;
	/** Line drawing style for this connection. */
	private Integer lineStyle = Graphics.LINE_SOLID;
	/** Connection's source endpoint. */
	private Shape source;
	/** Connection's target endpoint. */
	private Shape target;

	private RGB backColor = new RGB(255, 255, 255);// 前景色
	private RGB foreColor = new RGB(0, 0, 0); // 背景色
	private Integer sourceDecoration = 0; // 无
	private Integer targetDecoration = 1; // 实心箭头
	public static final String SOURCE_DECORATION_PROP="SourceDecoration";
	public static final String TARGET_DECORATION_PROP="TargetDecroation";

	static {
		descriptors = new IPropertyDescriptor[] {
				new ComboBoxPropertyDescriptor(LINESTYLE_PROP, LINESTYLE_PROP, new String[] {"无","实线","虚线" }),
				new TextPropertyDescriptor(FreeNoteConstants.DESC_PROPERTY, FreeNoteConstants.DESC_PROPERTY),
				new ColorPropertyDescriptor(FreeNoteConstants.BACKCOLOR, FreeNoteConstants.BACKCOLOR),
				new ColorPropertyDescriptor(FreeNoteConstants.FORECOLOR, FreeNoteConstants.FORECOLOR),
				new ComboBoxPropertyDescriptor(SOURCE_DECORATION_PROP, SOURCE_DECORATION_PROP,new String[]{"无","三角形","箭头","菱形","空心三角"}), 
				new ComboBoxPropertyDescriptor(TARGET_DECORATION_PROP, TARGET_DECORATION_PROP,new String[]{"无","三角形","箭头","菱形","空心三角"}),
				};
	}

	public Connection(Shape source, Shape target) {
		reconnect(source, target);
	}

	/**
	 * Disconnect this connection from the shapes it is attached to.
	 */
	public void disconnect() {
		if (isConnected) {
			source.removeConnection(this);
			target.removeConnection(this);
			isConnected = false;
		}
	}

	/**
	 * Returns the line drawing style of this connection.
	 * 
	 * @return an int value (Graphics.LINE_DASH or Graphics.LINE_SOLID)
	 */
	public Integer getLineStyle() {
		return lineStyle.equals(new Integer(0))?new Integer(1):lineStyle;
	}

	/**
	 * Returns the descriptor for the lineStyle property
	 * 
	 * @see org.eclipse.ui.views.properties.IPropertySource#getPropertyDescriptors()
	 */
	public IPropertyDescriptor[] getPropertyDescriptors() {
		return descriptors;
	}

	/**
	 * Returns the lineStyle as String for the Property Sheet
	 * 
	 * @see org.eclipse.ui.views.properties.IPropertySource#getPropertyValue(java.lang.Object)
	 */
	public Object getPropertyValue(Object id) {
		if (id.equals(LINESTYLE_PROP)) 
			return getLineStyle();
		if (id.equals(FreeNoteConstants.DESC_PROPERTY))
			return getDesc();
		if(id.equals(FreeNoteConstants.FORECOLOR))
			return getForeColor();
		if(id.equals(FreeNoteConstants.BACKCOLOR))
			return getBackColor();
		if(id.equals(SOURCE_DECORATION_PROP))
			return getSourceDecoration();
		if(id.equals(TARGET_DECORATION_PROP))
			return getTargetDecoration();
		return super.getPropertyValue(id);
	}

	/**
	 * Returns the source endpoint of this connection.
	 * 
	 * @return a non-null Shape instance
	 */
	public Shape getSource() {
		return source;
	}

	/**
	 * Returns the target endpoint of this connection.
	 * 
	 * @return a non-null Shape instance
	 */
	public Shape getTarget() {
		return target;
	}

	/**
	 * Reconnect this connection. The connection will reconnect with the shapes
	 * it was previously attached to.
	 */
	public void reconnect() {
		if (!isConnected) {
			source.addConnection(this);
			target.addConnection(this);
			isConnected = true;
		}
	}

	/**
	 * Reconnect to a different source and/or target shape. The connection will
	 * disconnect from its current attachments and reconnect to the new source
	 * and target.
	 * 
	 * @param newSource
	 *            a new source endpoint for this connection (non null)
	 * @param newTarget
	 *            a new target endpoint for this connection (non null)
	 * @throws IllegalArgumentException
	 *             if any of the paramers are null or newSource == newTarget
	 */
	public void reconnect(Shape newSource, Shape newTarget) {
		if (newSource == null || newTarget == null || newSource == newTarget) {
			throw new IllegalArgumentException();
		}
		disconnect();
		this.source = newSource;
		this.target = newTarget;
		reconnect();
	}

	/**
	 * Set the line drawing style of this connection.
	 * 
	 * @param lineStyle
	 *            one of following values: Graphics.LINE_DASH or
	 *            Graphics.LINE_SOLID
	 * @see Graphics#LINE_DASH
	 * @see Graphics#LINE_SOLID
	 * @throws IllegalArgumentException
	 *             if lineStyle does not have one of the above values
	 */
	public void setLineStyle(int lineStyle) {
		this.lineStyle = lineStyle;
		firePropertyChange(LINESTYLE_PROP, null, this.lineStyle);
	}

	/**
	 * Sets the lineStyle based on the String provided by the PropertySheet
	 * 
	 * @see org.eclipse.ui.views.properties.IPropertySource#setPropertyValue(java.lang.Object,
	 *      java.lang.Object)
	 */
	public void setPropertyValue(Object id, Object value) {
		if (id.equals(LINESTYLE_PROP))
			setLineStyle((Integer) value);
		else if (id.equals(FreeNoteConstants.DESC_PROPERTY))
			setDesc(String.valueOf(value));
		else if (id.equals(FreeNoteConstants.BACKCOLOR))
			setBackColor((RGB) value);
		else if (id.equals(FreeNoteConstants.FORECOLOR))
			setForeColor((RGB) value);
		else if(id.equals(SOURCE_DECORATION_PROP))
			setSourceDecoration((Integer) value);
		else if(id.equals(TARGET_DECORATION_PROP))
			setTargetDecoration((Integer) value);
		else
			super.setPropertyValue(id, value);
	}

	public String getDesc() {
		return desc == null ? desc="" : desc;
	}

	public void setDesc(String lineLabel) {
		this.desc = lineLabel;
		firePropertyChange(FreeNoteConstants.DESC_PROPERTY, null, lineLabel);
	}

	public RGB getBackColor() {
		return backColor == null ? backColor=new RGB(255, 255, 255):backColor;
	}

	public void setBackColor(RGB backColor) {
		this.backColor = backColor;
		firePropertyChange(FreeNoteConstants.BACKCOLOR, null, backColor);
	}

	public RGB getForeColor() {
		return foreColor == null ? foreColor=new RGB(0,0,0):foreColor;
	}

	public void setForeColor(RGB foreColor) {
		this.foreColor = foreColor;
		firePropertyChange(FreeNoteConstants.FORECOLOR, null, foreColor);
	}

	public Integer getSourceDecoration() {
		return sourceDecoration==null?sourceDecoration=0:sourceDecoration;
	}

	public void setSourceDecoration(Integer sourceDecoration) {
		this.sourceDecoration = sourceDecoration;
		firePropertyChange(SOURCE_DECORATION_PROP, null, sourceDecoration);
	}

	public Integer getTargetDecoration() {
		return targetDecoration==null?targetDecoration=1:targetDecoration;
	}

	public void setTargetDecoration(Integer targetDecoration) {
		this.targetDecoration = targetDecoration;
		firePropertyChange(TARGET_DECORATION_PROP, null, targetDecoration);
	}
}