nggenericswtcontrol.java

Novocode的 SWT 控件框架 丰富了MDI功能

/*******************************************************************************
 * Copyright (c) 2005 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.lang.reflect.Constructor;
import java.util.HashMap;
import java.util.Map;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.*;
import org.w3c.dom.Attr;
import org.w3c.dom.Node;

import com.novocode.naf.app.*;
import com.novocode.naf.data.XMLProperty;
import com.novocode.naf.resource.*;


/**
 * A generic wrapper class for SWT Controls.
 * 
 * @author Stefan Zeiger ([e-mail])
 * @since May 2, 2005
 */

public final class NGGenericSWTControl extends NGWidget
{
  public static final String NAF_REFLECT_NAMESPACE_URI = "http://www.novocode.com/namespaces/naf-reflect";

  private static final Class[] CONS_PARAM = new Class[] { Composite.class, Integer.TYPE };

  private SWTStyle[] swtStyle = new SWTStyle[] { SWTStyle.CLOSE, SWTStyle.TITLE, SWTStyle.MIN };

  private HashMap<String, String> reflectProperties = new HashMap<String, String>();


  public enum SWTStyle
  {
    BORDER (SWT.BORDER), CLOSE (SWT.CLOSE), MIN (SWT.MIN), BORDERLESS (SWT.NO_TRIM),
    TITLE (SWT.TITLE), SHELL (SWT.CLOSE|SWT.TITLE|SWT.MIN), DIALOG (SWT.DIALOG_TRIM),
    // HSCROLL (SWT.H_SCROLL), VSCROLL (SWT.V_SCROLL),
    PUSH (SWT.PUSH),
    TOP (SWT.ON_TOP), TOOL (SWT.TOOL);
    
    public final int style;
    SWTStyle(int style) { this.style = style; }
    
    public static int style(SWTStyle[] a)
    {
      if(a == null) return 0;
      int res = 0;
      for(SWTStyle t : a) if(t != null) res |= t.style;
      return res;
    }
  }


  @XMLProperty("style")
  public void setStyle(SWTStyle[] a) { swtStyle = a; }
  public SWTStyle[] getStyle() { return swtStyle; }

  
  @XMLProperty("class")
  public void setControlClass(String s) throws ClassNotFoundException { setReferencedClass(Class.forName(s)); }
  public String getControlClass() { Class c = getReferencedClass(); return c == null ? null : c.getName(); }

  
  protected void parseChild(Node n) throws NAFException
  {
    if(NAF_REFLECT_NAMESPACE_URI.equals(n.getNamespaceURI()))
    {
      if(n.getNodeType() == Node.ATTRIBUTE_NODE)
      {
        String name = ((Attr)n).getLocalName();
        String value = n.getTextContent();
        //System.out.println("Reflection Property: "+name+" -> "+value);
        reflectProperties.put(name, value);
      }
      /*else if(n.getNodeType() == Node.ELEMENT_NODE)
      {
      }*/
    }
    else super.parseChild(n);
  }

  
  protected Control createControl(Composite parent, NGComponent parentComp, ShellWindowInstance wi, WidgetData pwd) throws NAFException
  {
    try
    {
      Constructor<?> cons = getReferencedClass().getConstructor(CONS_PARAM);
      int style = SWTStyle.style(swtStyle);
      Control c = (Control)cons.newInstance(new Object[] { parent, new Integer(style) });
      for(Map.Entry<String, String> entry : reflectProperties.entrySet())
      {
        String name = entry.getKey();
        String value = entry.getValue();
      }
      return c;
    }
    catch(Exception ex)
    {
      throw new NAFException("Error instantiating SWT Control", ex);
    }
  }
}