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., 59 Temple Place, Suite 330, Boston, MA 19 02111-1307 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 package javax.swing; 39 40 import java.awt.FlowLayout; 41 import java.awt.LayoutManager; 42 import javax.accessibility.Accessible; 43 import javax.accessibility.AccessibleContext; 44 import javax.swing.plaf.PanelUI; 45 46 47 /** 48 * An instance of JPanel can be added to a panel, frame etc 49 * 50 * @author Ronald Veldema (rveldema@cs.vu.nl) 51 */ 52 public class JPanel extends JComponent implements Accessible 53 { JPanel()54 public JPanel() 55 { 56 this(new FlowLayout(), 57 true); 58 } 59 JPanel(boolean double_buffered)60 public JPanel(boolean double_buffered) 61 { 62 this(new FlowLayout(), 63 double_buffered); 64 } 65 JPanel(LayoutManager layout)66 public JPanel(LayoutManager layout) 67 { 68 this(layout, 69 true); 70 } 71 72 JPanel(LayoutManager layout, boolean isDoubleBuffered)73 public JPanel(LayoutManager layout, 74 boolean isDoubleBuffered) 75 { 76 if (layout == null) 77 { 78 System.err.println("NO LAYOUT SET !!!"); 79 layout = new FlowLayout(); 80 } 81 setLayout(layout); 82 setOpaque(true); 83 84 updateUI(); 85 } 86 getUIClassID()87 public String getUIClassID() 88 { return "JPanel"; } 89 90 setUI(PanelUI ui)91 public void setUI(PanelUI ui) { 92 super.setUI(ui); 93 } 94 getUI()95 public PanelUI getUI() { 96 return (PanelUI)ui; 97 } 98 updateUI()99 public void updateUI() { 100 setUI((PanelUI)UIManager.getUI(this)); 101 } 102 103 getAccessibleContext()104 public AccessibleContext getAccessibleContext() 105 { 106 return null; 107 } 108 paramString()109 protected String paramString() 110 { 111 return "JPanel"; 112 } 113 } 114