1 /* JScrollPane.java -- 2 Copyright (C) 2002 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 39 package javax.swing; 40 41 import java.awt.Component; 42 import javax.accessibility.Accessible; 43 import javax.swing.plaf.ScrollPaneUI; 44 45 public class JScrollPane extends JComponent implements Accessible, ScrollPaneConstants 46 { 47 protected JViewport columnHeader; 48 protected JViewport rowHeader; 49 50 protected Component lowerLeft; 51 protected Component lowerRight; 52 protected Component upperLeft; 53 protected Component upperRight; 54 55 protected JScrollBar horizontalScrollBar; 56 protected int horizontalScrollBarPolicy; 57 protected JScrollBar verticalScrollBar; 58 protected int verticalScrollBarPolicy; 59 60 protected JViewport viewport; 61 62 JScrollPane()63 public JScrollPane() 64 { 65 this(null, 0, 0); 66 } 67 JScrollPane(Component view)68 public JScrollPane(Component view) 69 { 70 this(view, 0, 0); 71 } 72 73 JScrollPane(int vsbPolicy, int hsbPolicy)74 public JScrollPane(int vsbPolicy, int hsbPolicy) 75 { 76 this(null, 0, 0); 77 } 78 JScrollPane(Component view, int vsbPolicy, int hsbPolicy)79 public JScrollPane(Component view, int vsbPolicy, int hsbPolicy) 80 { 81 setViewportView(view); 82 setOpaque(true); 83 updateUI(); 84 } 85 getUIClassID()86 public String getUIClassID() 87 { 88 //Returns a string that specifies the name of the L&F class that renders this component. 89 return "JScrollPane"; 90 } 91 getViewport()92 public JViewport getViewport() 93 { 94 return viewport; 95 } 96 createViewport()97 public JViewport createViewport() 98 { 99 return new JViewport(); 100 } 101 setViewport(JViewport v)102 public void setViewport(JViewport v) 103 { 104 if (viewport != null) 105 remove(viewport); 106 107 viewport = v; 108 109 add(v); 110 111 revalidate(); 112 repaint(); 113 } 114 updateUI()115 public void updateUI() 116 { 117 ScrollPaneUI b = (ScrollPaneUI)UIManager.getUI(this); 118 setUI(b); 119 } 120 121 setViewportView(Component view)122 public void setViewportView(Component view) 123 { 124 if (getViewport() == null) 125 { 126 setViewport(createViewport()); 127 } 128 129 if (view != null) 130 { 131 getViewport().setView(view); 132 } 133 } 134 } 135