libjava/javax/swing/JScrollPane.java

   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
  63     public JScrollPane()
  64     {
  65         this(null, 0, 0);
  66     }
  67
  68     public JScrollPane(Component view)
  69     {
  70         this(view, 0, 0);
  71     }
  72
  73
  74     public JScrollPane(int vsbPolicy, int hsbPolicy)
  75     {
  76         this(null, 0, 0);
  77     }
  78
  79     public JScrollPane(Component view, int vsbPolicy, int hsbPolicy)
  80     {
  81         setViewportView(view);
  82         setOpaque(true);
  83         updateUI();
  84     }
  85
  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
  92     public JViewport getViewport()
  93     {
  94         return viewport;
  95     }
  96
  97     public JViewport createViewport()
  98     {
  99         return new JViewport();
 100     }
 101
 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
 115    public  void updateUI()
 116     {
 117         ScrollPaneUI b = (ScrollPaneUI)UIManager.getUI(this);
 118         setUI(b);
 119     }
 120
 121
 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 }