listheader.java

sifi-0.1.6.tar.gz 出自http://www.ifi.unizh.ch/ikm/SINUS/firewall/ 一个linux的防火墙工具。

/* ----------------------------------------------------------------------
   The SINUS Firewall -- a TCP/IP packet filter for Linux

   Written within the SINUS project at the University of Zurich,
   SWITCH, Telekurs Payserv AG, ETH Zurich.
   originally based on the sf Firewall Software (C) 1996 by Robert
   Muchsel and Roland Schmid.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

   SINUS Firewall resources:
   SINUS Homepage: http://www.ifi.unizh.ch/ikm/SINUS/
   Firewall Homepage: http://www.ifi.unizh.ch/ikm/SINUS/firewall.html
   Frequently asked questions: http://www.ifi.unizh.ch/ikm/SINUS/sf_faq.html
   Mailing list for comments, questions, bug reports: [e-mail]
   ----------------------------------------------------------------------  */



package sfclasses;

import java.awt.*;
import java.util.*;

/**
 * <b>List Header</b><br>
 * This is an abstract class. Subclasses of ListHeader can be used as
 * header bar of ListPanel. For examples of subclasses see ShowHeader
 * and TcpHeader in FirewallAction.java or RuleHeader in RuleEditor.java.
 * @version 1.0 23 Jan 1997
 * @author Roland E. Schmid
 */

abstract public class ListHeader extends Canvas {

  /**
   * Initialize object.
   * @param listCanvas Corresponding subclass of ListCanvas
   */
  public ListHeader(ListCanvas listCanvas) {
    this.listCanvas = listCanvas;
  }

  public synchronized void paint(Graphics g) {
    FontMetrics fm = g.getFontMetrics();
    int maxascent = fm.getMaxAscent();

    // draw vertical lines
    for (int col=1; col < listCanvas.column_no; col++)
      g.drawLine(listCanvas.column_pos[col], 0, 
                 listCanvas.column_pos[col], canvas_height);

    // draw headers
      for (int col=0; col < listCanvas.column_no; col++) 
        g.drawString(listCanvas.clipString(header[col], listCanvas.column_size[col]-3, fm), 
          listCanvas.column_pos[col]+1, maxascent);

    g.drawLine(0, canvas_height-1, canvas_width, canvas_height-1);

  } // paint

  public Dimension getPreferredSize() {
    Graphics g = getGraphics();
    FontMetrics fm = g.getFontMetrics();
    g.dispose();
    return new Dimension(100, fm.getHeight()+1);
  }

  public Dimension getMinimumSize() {
    return getPreferredSize();
  }

  /**
   * called when panel size changes (e.g. on startup)
   */
  public synchronized void setBounds(int x, int y, int width, int height) {
    // call setBounds() of superclass
    super.setBounds(x, y, width, height);
    
    canvas_width = width;
    canvas_height = height;
  }

  private ListCanvas listCanvas;
  private int canvas_width, canvas_height;

  protected String header[];
}