Source for javax.swing.JPanel

   1: /* JPanel.java --
   2:    Copyright (C) 2002, 2004 Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package javax.swing;
  40: 
  41: import java.awt.FlowLayout;
  42: import java.awt.LayoutManager;
  43: 
  44: import javax.accessibility.Accessible;
  45: import javax.accessibility.AccessibleContext;
  46: import javax.swing.plaf.PanelUI;
  47: 
  48: /**
  49:  * An instance of JPanel can be added to a panel, frame etc
  50:  *
  51:  * @author Ronald Veldema (rveldema@cs.vu.nl)
  52:  */
  53: public class JPanel extends JComponent implements Accessible
  54: {
  55:     public JPanel()
  56:     {
  57:     this(new FlowLayout(),
  58:          true);
  59:     }
  60:     
  61:     public JPanel(boolean double_buffered)
  62:     {
  63:     this(new FlowLayout(),
  64:          double_buffered);
  65:     }
  66:     
  67:     public JPanel(LayoutManager layout)
  68:     {
  69:     this(layout,
  70:          true);
  71:     }
  72:     
  73:     
  74:     public JPanel(LayoutManager layout,
  75:        boolean isDoubleBuffered)
  76:     {
  77:     if (layout == null)
  78:         {
  79:         System.err.println("NO LAYOUT SET !!!");
  80:         layout = new FlowLayout();
  81:         }
  82:     setLayout(layout); 
  83:     setOpaque(true); 
  84: 
  85:     updateUI();    
  86:     } 
  87: 
  88:     public String getUIClassID()
  89:     {    return "PanelUI";    }
  90: 
  91: 
  92:     public void setUI(PanelUI ui) {
  93:         super.setUI(ui);
  94:     }
  95:     
  96:     public PanelUI getUI() {
  97:         return (PanelUI)ui;
  98:     }
  99:     
 100:     public void updateUI() {
 101:         setUI((PanelUI)UIManager.getUI(this));
 102:     }
 103: 
 104: 
 105:     public AccessibleContext getAccessibleContext()
 106:     {
 107:     return null;
 108:     }
 109:     
 110:    protected  String paramString()
 111:     {
 112:     return "JPanel";
 113:     }
 114: }