libjava/classpath/examples/gnu/classpath/examples/swing/ScrollBarDemo.java

   1 /* ScrollBarDemo.java -- An example showing scroll bars in Swing.
   2    Copyright (C) 2005, 2006, Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath examples.
   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
  22
  23 package gnu.classpath.examples.swing;
  24
  25 import java.awt.BorderLayout;
  26 import java.awt.GridLayout;
  27 import java.awt.event.ActionEvent;
  28 import java.awt.event.ActionListener;
  29
  30 import javax.swing.JButton;
  31 import javax.swing.JComponent;
  32 import javax.swing.JFrame;
  33 import javax.swing.JPanel;
  34 import javax.swing.JScrollBar;
  35 import javax.swing.SwingUtilities;
  36
  37 /**
  38  * A simple scroll bar demo showing various scroll bars in different states.
  39  */
  40 public class ScrollBarDemo
  41   extends JPanel
  42   implements ActionListener
  43 {
  44
  45   /**
  46    * Creates a new demo instance.
  47    */
  48   public ScrollBarDemo()
  49   {
  50     super();
  51     createContent();
  52   }
  53
  54   /**
  55    * When the demo is run independently, the frame is displayed, so we should
  56    * initialise the content panel (including the demo content and a close
  57    * button).  But when the demo is run as part of the Swing activity board,
  58    * only the demo content panel is used, the frame itself is never displayed,
  59    * so we can avoid this step.
  60    */
  61   void initFrameContent()
  62   {
  63     JPanel closePanel = new JPanel();
  64     JButton closeButton = new JButton("Close");
  65     closeButton.setActionCommand("CLOSE");
  66     closeButton.addActionListener(this);
  67     closePanel.add(closeButton);
  68     add(closePanel, BorderLayout.SOUTH);
  69   }
  70
  71   /**
  72    * Returns a panel with the demo content.  The panel
  73    * uses a BorderLayout(), and the BorderLayout.SOUTH area
  74    * is empty, to allow callers to add controls to the
  75    * bottom of the panel if they want to (a close button is
  76    * added if this demo is being run as a standalone demo).
  77    */
  78   private void createContent()
  79   {
  80     setLayout(new BorderLayout());
  81     JPanel panel = createScrollBarPanel();
  82     add(panel);
  83   }
  84
  85   private JPanel createScrollBarPanel()
  86   {
  87     JPanel panel = new JPanel(new BorderLayout());
  88
  89     JPanel horizontalPanel = new JPanel();
  90
  91     JScrollBar scroll1a = new JScrollBar(JScrollBar.HORIZONTAL);
  92     JScrollBar scroll1b = new JScrollBar(JScrollBar.HORIZONTAL);
  93     scroll1b.setEnabled(false);
  94     JScrollBar scroll1c = new JScrollBar(JScrollBar.HORIZONTAL);
  95     scroll1c.putClientProperty("JScrollBar.isFreeStanding", Boolean.FALSE);
  96     JScrollBar scroll1d = new JScrollBar(JScrollBar.HORIZONTAL);
  97     scroll1d.putClientProperty("JScrollBar.isFreeStanding", Boolean.FALSE);
  98     scroll1d.setEnabled(false);
  99     horizontalPanel.add(scroll1a);
 100     horizontalPanel.add(scroll1b);
 101     horizontalPanel.add(scroll1c);
 102     horizontalPanel.add(scroll1d);
 103
 104     panel.add(horizontalPanel, BorderLayout.NORTH);
 105
 106     JPanel verticalPanel = new JPanel();
 107     verticalPanel.setLayout(new GridLayout(1, 7));
 108
 109     JScrollBar scroll2a = new JScrollBar(JScrollBar.VERTICAL);
 110     JScrollBar scroll2b = new JScrollBar(JScrollBar.VERTICAL);
 111     scroll2b.setEnabled(false);
 112     JScrollBar scroll2c = new JScrollBar(JScrollBar.VERTICAL);
 113     scroll2c.putClientProperty("JScrollBar.isFreeStanding", Boolean.FALSE);
 114     JScrollBar scroll2d = new JScrollBar(JScrollBar.VERTICAL);
 115     scroll2d.setEnabled(false);
 116     scroll2d.putClientProperty("JScrollBar.isFreeStanding", Boolean.FALSE);
 117
 118     verticalPanel.add(scroll2a);
 119     verticalPanel.add(new JPanel());
 120     verticalPanel.add(scroll2b);
 121     verticalPanel.add(new JPanel());
 122     verticalPanel.add(scroll2c);
 123     verticalPanel.add(new JPanel());
 124     verticalPanel.add(scroll2d);
 125
 126     panel.add(verticalPanel, BorderLayout.EAST);
 127
 128     JPanel centerPanel = new JPanel(new GridLayout(1, 2));
 129     centerPanel.add(new JScrollBar(JScrollBar.HORIZONTAL));
 130     centerPanel.add(new JScrollBar(JScrollBar.VERTICAL));
 131     panel.add(centerPanel);
 132     return panel;
 133   }
 134
 135   public void actionPerformed(ActionEvent e)
 136   {
 137     if (e.getActionCommand().equals("CLOSE"))
 138     {
 139       System.exit(0);
 140     }
 141   }
 142
 143   public static void main(String[] args)
 144   {
 145     SwingUtilities.invokeLater
 146     (new Runnable()
 147      {
 148        public void run()
 149        {
 150          ScrollBarDemo app = new ScrollBarDemo();
 151          app.initFrameContent();
 152          JFrame frame = new JFrame("ScrollBar Demo");
 153          frame.getContentPane().add(app);
 154          frame.pack();
 155          frame.setVisible(true);
 156        }});
 157     }
 158
 159   /**
 160    * Returns a DemoFactory that creates a ScrollBarDemo.
 161    *
 162    * @return a DemoFactory that creates a ScrollBarDemo
 163    */
 164   public static DemoFactory createDemoFactory()
 165   {
 166     return new DemoFactory()
 167     {
 168       public JComponent createDemo()
 169       {
 170         return new ScrollBarDemo();
 171       }
 172     };
 173   }
 174 }