nglink.java

Novocode的 SWT 控件框架 丰富了MDI功能

/*******************************************************************************
 * Copyright (c) 2004 Stefan Zeiger 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.novocode.com/legal/epl-v10.html
 * 
 * Contributors:
 *     Stefan Zeiger ([e-mail]) - initial API and implementation
 *******************************************************************************/

package com.novocode.naf.gui;

import java.util.*;
import java.util.LinkedList;

import org.eclipse.swt.SWT;
import org.eclipse.swt.program.Program;
import org.eclipse.swt.widgets.*;
import org.w3c.dom.*;

import com.novocode.naf.app.*;
import com.novocode.naf.data.DataDecoder;
import com.novocode.naf.data.ModelBinding;
import com.novocode.naf.data.XMLProperty;
import com.novocode.naf.gui.event.*;
import com.novocode.naf.resource.*;


/**
 * An SWT Link.
 * 
 * @author Stefan Zeiger ([e-mail])
 * @since Mar 19, 2005
 */

public final class NGLink extends NGWidget
{
  private String text;
  private LinkedList<String> childTokens;

  @XMLProperty public void setText(String s) { this.text = s; this.text = s; }
  public String getText() { return text; }


  protected void init() throws NAFException
  {
    super.init();
    if(childTokens != null && text == null)
    {
      StringBuffer b = new StringBuffer();
      for(String s : childTokens) b.append(s);
      text = b.toString().trim().replace((char)160,' ');
      if(text.length() == 0) text = null;
    }
  }


  protected void parseChild(Node n) throws NAFException // [TODO] Don't decode backslash sequences
  {
    if(n.getNodeType() == Node.TEXT_NODE)
    {
      if(childTokens == null) childTokens = new LinkedList<String>();
      String text = ((org.w3c.dom.Text)n).getData();
      text = text.replace('\r', ' ').replace('\n', ' ').replace('\r', ' ');
      if(text.startsWith(" ") && childTokens.size() != 0 && (!" ".equals(childTokens.getLast())) && (!"\n".equals(childTokens.getLast())))
        childTokens.add(" ");
      boolean first = true;
      for(StringTokenizer tok = new StringTokenizer(text); tok.hasMoreTokens();)
      {
        String s = tok.nextToken();
        if(s.length() == 0) continue;
        if(!first) childTokens.add(" ");
        childTokens.add(s);
        first = false;
      }
      if(text.endsWith(" ")) childTokens.add(" ");
    }
    else if(n.getNodeType() == Node.ELEMENT_NODE
            && GUIResourceManager.NAF_NAMESPACE_URI.equals(n.getNamespaceURI()))
    {
      String loc = n.getLocalName();
      if(loc.equals("br"))
      {
        if(childTokens == null) childTokens = new LinkedList<String>();
        if(childTokens.size() != 0 && " ".equals(childTokens.getLast())) childTokens.removeLast();
        childTokens.add("\n");
      }
      else if(loc.equals("a"))
      {
        if(childTokens == null) childTokens = new LinkedList<String>();
        Node hrefN = n.getAttributes().getNamedItem("href");
        if(hrefN != null) childTokens.add("<a href=\""+hrefN.getTextContent()+"\">"+n.getTextContent()+"</a>");
        else childTokens.add("<a>"+n.getTextContent()+"</a>");
      }
      else super.parseChild(n);
    }
    else super.parseChild(n);
  }


  public Control createControl(Composite parent, NGComponent parentComp, final ShellWindowInstance wi, WidgetData pwd) throws NAFException
  {
    Link link = new Link(parent, SWT.NONE);

    if(text != null) link.setText(DataDecoder.decodeAccessKey(text));
    
    final IActionListener actionModel = getModel("action", wi.models);
    if(actionModel != null)
    {
      link.addListener(SWT.Selection, new Listener()
      {
        public void handleEvent(Event event)
        {
          actionModel.performAction(new ActionEvent(NGLink.this, event.text, wi));
        }
      });
    }
    else
    {
      link.addListener(SWT.Selection, new Listener()
      {
        public void handleEvent(Event event)
        {
          Program.launch(event.text);
        }
      });
    }

    return link;
  }

    
  protected Object createDefaultModel(ModelBinding mb)
  {
    if("action".equals(mb.type)) return new DefaultActionBroadcaster(mb.id);
    else return super.createDefaultModel(mb);
  }
}