fileproxy.java

mywork是rcp开发的很好的例子

package net.sf.component.simplenote;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import net.sf.util.TousleUtil;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.PaintObjectEvent;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.program.Program;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Link;
import org.eclipse.swt.widgets.Shell;


/**
 * 定义文件链接信息
 * 也可由形如<a href=aaa.doc width=120 height=160>测试.doc</a>的字串构成
 * @author levin
 * 2007.03.15
 */
public class FileProxy extends ElementProxy{
	public String name;
	private Control control; //要显示的，可以是个链接，也可以是个带图片的链接
	public transient File originalFile; //原始文件，可能不存在
	public static int MARGIN = 5;
	public FileProxy(String src, String name, int width, int height) {
		super();
		this.src = src;
		this.name = name;
		this.width = width;
		this.height = height;
	}

	//由文件生成
	public FileProxy(File f){
		this.name=f.getName();
		originalFile=f;
		//构造一个link，判断一下大小
		Shell shell=Display.getCurrent().getActiveShell() == null ? new Shell(Display.getCurrent()):Display.getCurrent().getActiveShell();
		Link link=new Link(shell,SWT.NULL);
		link.setText(this.name);
		link.pack();
		Rectangle size = link.getBounds();
		this.width=size.width;
		this.height=size.height;
		link.dispose();
	}
	
	//由html生成
	public FileProxy(String html){
		//防止解析出错
		this("","NO_FILE",10,10);
		try{
			Pattern p=Pattern.compile("<a\\s+href=([a-z\\.A-Z/0-9]*)\\s+width=([0-9]*)\\s+height=([0-9]*)>(.*)</a>");
			Matcher m=p.matcher(html);
			if(m.find()){
				this.src=m.group(1);
				this.width=Integer.parseInt(m.group(2));
				this.height=Integer.parseInt(m.group(3));
				this.name=m.group(4);
			}
		}catch(Exception ex){
			ex.printStackTrace();
		}
		
	}
	
	public FileProxy() {
	}

	//取定义的html
	public String getHtml(){
		return "<a href="+src+" width="+width+" height="+height+">"+name+"</a>";
	}
	
	public int[] getMetrics(){
		int ascent = 2*height/3;
		int descent = height - ascent;
		return new int[]{ascent + MARGIN, descent + MARGIN, width + 2*MARGIN};
	}
	
	public void save(String basePath){
		try {
			if(originalFile == null)
				return ;
			File file=createEmbedFile(basePath,originalFile.getName().substring(originalFile.getName().indexOf(".")));
			TousleUtil.copyIntput2Output(new FileInputStream(originalFile), new FileOutputStream(file));
			//设置imageProxy的src属性
			src="embed/"+file.getName();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	public void draw(String basePath,PaintObjectEvent event,Composite parent){
		Control control = getControl(basePath, parent);
		Point pt = control.getSize();
		int x = event.x + FileProxy.MARGIN;
		int y = event.y + event.ascent - 2*pt.y/3;
		control.setLocation(x, y);
	}

	public void dispose(){
		if(control != null){
			control.dispose();
			control =null;
		}
	}

	public String getPlaceholder(){
		return "\uFFFD";
	}
	
	private Control getControl(final String basePath,final Composite parent){
		if(control == null){
			control = new Link(parent,SWT.NULL);
			control.setSize(width, height);
			control.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_WHITE));
			Link link = ((Link)control);
			link.setText("<a>"+name+"</a>");
			//左键打开，右键另存
			link.addSelectionListener(new SelectionAdapter(){
				public void widgetSelected(SelectionEvent e) {
					File f= originalFile == null ? new File(basePath,src) : originalFile;
					Program.launch(f.getAbsolutePath());
				}
			});
			link.addMouseListener(new MouseAdapter(){
				@Override
				public void mouseUp(MouseEvent e) {
					//右键另存为
					if(e.button > 1){
						saveFileAs(basePath,parent);
					}
				}
				
			});
		}
		return control;
	}

	private void saveFileAs(String basePath,Composite parent) {
		final FileDialog fd=new FileDialog(parent.getShell(),SWT.SAVE);
		File f= src == null ? originalFile : new File(basePath,src);
		fd.setFileName(name);
		String fname=fd.open();
		if (fname != null) {
			try {
				// 提示是否覆盖
				if (!new File(fname).exists() || MessageDialog.openConfirm(fd.getParent(), "文件覆盖确认", "文件已经存在，是否覆盖?")) {
					TousleUtil.copyIntput2Output(new FileInputStream(f), new FileOutputStream(fname));
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}