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tips4javatips4java
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‎source/SmartScrollerDemo.java‎

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import java.awt.*;
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import java.awt.event.*;
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import java.text.*;
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import java.util.Date;
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import javax.swing.*;
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import javax.swing.border.*;
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import javax.swing.text.*;
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public class SmartScrollerDemo extends JPanel
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implements ActionListener
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{
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private JRadioButton horizontal;
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private JRadioButton vertical;
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private JRadioButton start;
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private JRadioButton end;
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private JScrollPane textAreaSP;
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private JScrollPane listSP;
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private JTextArea textArea;
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private JList list;
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private Timer timer;
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private SmartScroller textAreaScroller;
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private SmartScroller listScroller;
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public SmartScrollerDemo()
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{
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setBorder( new EmptyBorder(5, 5, 5, 5) );
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setLayout( new BorderLayout(10, 10) );
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add(createNorthPanel(), BorderLayout.NORTH);
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add(createCenterPanel());
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add(createSouthPanel(), BorderLayout.SOUTH);
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resetScrolling();
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}
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private JPanel createNorthPanel()
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{
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JPanel panel = new JPanel( new GridLayout(1, 0, 5, 5) );
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JLabel textArea = new JLabel( "JTextArea" );
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textArea.setHorizontalAlignment( JLabel.CENTER );
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panel.add( textArea );
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JLabel list = new JLabel( "JList" );
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list.setHorizontalAlignment( JLabel.CENTER );
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panel.add( list );
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return panel;
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}
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private JPanel createCenterPanel()
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{
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JPanel panel = new JPanel( new GridLayout(1, 0, 5, 5) );
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JTextArea textArea = new JTextArea();
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textArea.setEditable( false );
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textAreaSP = new JScrollPane( textArea );
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panel.add( textAreaSP );
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JList<String> list = new JList<String>( new DefaultListModel<String>() );
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list.setVisibleRowCount(1);
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listSP = new JScrollPane( list );
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panel.add( listSP );
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return panel;
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}
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private JPanel createSouthPanel()
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{
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JPanel panel = new JPanel( new GridLayout(1, 0, 5, 5) );
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TitledBorder border = new TitledBorder("Change properties then click Reset");
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border.setTitleJustification( TitledBorder.CENTER );
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panel.setBorder( border );
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JPanel r1 = new JPanel( new GridLayout(0, 1) );
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r1.setBorder( new TitledBorder("Scrolling Direction:") );
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horizontal = new JRadioButton("Horizontal");
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r1.add( horizontal );
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vertical = new JRadioButton("Vertical");
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vertical.setSelected( true );
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r1.add( vertical );
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ButtonGroup vbGroup = new ButtonGroup();
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vbGroup.add( horizontal );
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vbGroup.add( vertical );
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panel.add( r1 );
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JPanel r2 = new JPanel( new GridLayout(0, 1) );
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r2.setBorder( new TitledBorder("Viewport Position:") );
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start = new JRadioButton("Start");
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r2.add( start );
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end = new JRadioButton("End");
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end.setSelected( true );
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r2.add( end );
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ButtonGroup huGroup = new ButtonGroup();
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huGroup.add( start );
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huGroup.add( end );
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panel.add( r2 );
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JButton button = new JButton("Reset Smart Scroller");
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button.addActionListener( this );
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panel.add( button );
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return panel;
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}
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@SuppressWarnings("unchecked")
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private void resetScrolling()
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{
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if (timer != null)
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timer.stop();
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if (textAreaScroller != null)
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{
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textAreaSP.getVerticalScrollBar().removeAdjustmentListener(textAreaScroller);
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textAreaSP.getHorizontalScrollBar().removeAdjustmentListener(textAreaScroller);
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listSP.getVerticalScrollBar().removeAdjustmentListener(listScroller);
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listSP.getHorizontalScrollBar().removeAdjustmentListener(listScroller);
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}
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JTextArea textArea = (JTextArea)textAreaSP.getViewport().getView();
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textArea.setText("");
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final Document doc = textArea.getDocument();
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final String prefix = vertical.isSelected() ? "\nplus some longer text and longer and longer" : "\tand some more text";
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JList list = (JList)listSP.getViewport().getView();
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list.setLayoutOrientation(vertical.isSelected() ? JList.VERTICAL : JList.HORIZONTAL_WRAP);
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final DefaultListModel model = (DefaultListModel)list.getModel();
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model.clear();
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int scrollDirection = vertical.isSelected() ? SmartScroller.VERTICAL : SmartScroller.HORIZONTAL;
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int position = end.isSelected() ? SmartScroller.END : SmartScroller.START;
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textAreaScroller = new SmartScroller(textAreaSP, scrollDirection, position);
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listScroller = new SmartScroller(listSP, scrollDirection, position);
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timer = new Timer(1000, new ActionListener()
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{
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public void actionPerformed(ActionEvent e)
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{
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try
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{
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Format formatter = DateFormat.getTimeInstance();
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String now = formatter.format( new Date() );
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int offset = end.isSelected() ? doc.getLength() : 0;
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doc.insertString(offset, prefix + now.toString(), null);
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int index = end.isSelected() ? model.getSize() : 0;
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model.insertElementAt(now + " ", index);
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}
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catch (BadLocationException e1) {}
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}
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});
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timer.start();
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}
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public void actionPerformed(ActionEvent e)
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{
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resetScrolling();
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}
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public static void main(String[] args)
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{
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SwingUtilities.invokeLater(new Runnable() {
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public void run() {
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createAndShowGUI();
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}
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});
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}
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public static void createAndShowGUI()
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{
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JFrame frame = new JFrame("Smart Scroller");
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.add( new SmartScrollerDemo() );
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frame.setSize(560, 260);
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frame.setLocationRelativeTo(null);
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frame.setVisible(true);
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}
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}

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