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SmartScrollerDemo.java
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183 lines (151 loc) · 5.14 KB
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import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.util.Date;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.text.*;
public class SmartScrollerDemo extends JPanel
implements ActionListener
{
private JRadioButton horizontal;
private JRadioButton vertical;
private JRadioButton start;
private JRadioButton end;
private JScrollPane textAreaSP;
private JScrollPane listSP;
private JTextArea textArea;
private JList list;
private Timer timer;
private SmartScroller textAreaScroller;
private SmartScroller listScroller;
public SmartScrollerDemo()
{
setBorder( new EmptyBorder(5, 5, 5, 5) );
setLayout( new BorderLayout(10, 10) );
add(createNorthPanel(), BorderLayout.NORTH);
add(createCenterPanel());
add(createSouthPanel(), BorderLayout.SOUTH);
resetScrolling();
}
private JPanel createNorthPanel()
{
JPanel panel = new JPanel( new GridLayout(1, 0, 5, 5) );
JLabel textArea = new JLabel( "JTextArea" );
textArea.setHorizontalAlignment( JLabel.CENTER );
panel.add( textArea );
JLabel list = new JLabel( "JList" );
list.setHorizontalAlignment( JLabel.CENTER );
panel.add( list );
return panel;
}
private JPanel createCenterPanel()
{
JPanel panel = new JPanel( new GridLayout(1, 0, 5, 5) );
JTextArea textArea = new JTextArea();
textArea.setEditable( false );
textAreaSP = new JScrollPane( textArea );
panel.add( textAreaSP );
JList<String> list = new JList<String>( new DefaultListModel<String>() );
list.setVisibleRowCount(1);
listSP = new JScrollPane( list );
panel.add( listSP );
return panel;
}
private JPanel createSouthPanel()
{
JPanel panel = new JPanel( new GridLayout(1, 0, 5, 5) );
TitledBorder border = new TitledBorder("Change properties then click Reset");
border.setTitleJustification( TitledBorder.CENTER );
panel.setBorder( border );
JPanel r1 = new JPanel( new GridLayout(0, 1) );
r1.setBorder( new TitledBorder("Scrolling Direction:") );
horizontal = new JRadioButton("Horizontal");
r1.add( horizontal );
vertical = new JRadioButton("Vertical");
vertical.setSelected( true );
r1.add( vertical );
ButtonGroup vbGroup = new ButtonGroup();
vbGroup.add( horizontal );
vbGroup.add( vertical );
panel.add( r1 );
JPanel r2 = new JPanel( new GridLayout(0, 1) );
r2.setBorder( new TitledBorder("Viewport Position:") );
start = new JRadioButton("Start");
r2.add( start );
end = new JRadioButton("End");
end.setSelected( true );
r2.add( end );
ButtonGroup huGroup = new ButtonGroup();
huGroup.add( start );
huGroup.add( end );
panel.add( r2 );
JButton button = new JButton("Reset Smart Scroller");
button.addActionListener( this );
panel.add( button );
return panel;
}
@SuppressWarnings("unchecked")
private void resetScrolling()
{
if (timer != null)
timer.stop();
if (textAreaScroller != null)
{
textAreaSP.getVerticalScrollBar().removeAdjustmentListener(textAreaScroller);
textAreaSP.getHorizontalScrollBar().removeAdjustmentListener(textAreaScroller);
listSP.getVerticalScrollBar().removeAdjustmentListener(listScroller);
listSP.getHorizontalScrollBar().removeAdjustmentListener(listScroller);
}
JTextArea textArea = (JTextArea)textAreaSP.getViewport().getView();
textArea.setText("");
final Document doc = textArea.getDocument();
final String prefix = vertical.isSelected() ? "\nplus some longer text and longer and longer" : "\tand some more text";
JList list = (JList)listSP.getViewport().getView();
list.setLayoutOrientation(vertical.isSelected() ? JList.VERTICAL : JList.HORIZONTAL_WRAP);
final DefaultListModel model = (DefaultListModel)list.getModel();
model.clear();
int scrollDirection = vertical.isSelected() ? SmartScroller.VERTICAL : SmartScroller.HORIZONTAL;
int position = end.isSelected() ? SmartScroller.END : SmartScroller.START;
textAreaScroller = new SmartScroller(textAreaSP, scrollDirection, position);
listScroller = new SmartScroller(listSP, scrollDirection, position);
timer = new Timer(1000, new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
try
{
Format formatter = DateFormat.getTimeInstance();
String now = formatter.format( new Date() );
int offset = end.isSelected() ? doc.getLength() : 0;
doc.insertString(offset, prefix + now.toString(), null);
int index = end.isSelected() ? model.getSize() : 0;
model.insertElementAt(now + " ", index);
}
catch (BadLocationException e1) {}
}
});
timer.start();
}
public void actionPerformed(ActionEvent e)
{
resetScrolling();
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
public static void createAndShowGUI()
{
JFrame frame = new JFrame("Smart Scroller");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add( new SmartScrollerDemo() );
frame.setSize(560, 260);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}