package com.opensymphony.workflow.designer.swing.status;import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.EmptyBorder;import com.opensymphony.workflow.designer.ResourceManager;import com.opensymphony.workflow.designer.swing.plaf.BlueButtonUI;/** * @author Hani Suleiman (hani@formicary.net) *         Date: Dec 24, 2003 *         Time: 4:07:15 PM */public class MemoryDisplay extends DisplayItem{  private static final Color edgeColor = new Color(82, 115, 214);  private static final Color centerColor = new Color(180, 200, 230);  private final Icon gcIcon = ResourceManager.getIcon("gc");  private MemoryPanel panel;  private JButton invokeGC;  private int updateInterval = 2000;  private Timer timer;  class MemoryPanel extends JPanel  {    public void paint(Graphics g)    {      super.paint(g);      Dimension dimension = getSize();      Insets insets = getInsets();      int left = insets.left;      int top = insets.top;      Runtime runtime = Runtime.getRuntime();      long freeMemory = runtime.freeMemory();      long totalMemory = runtime.totalMemory();      int insideWidth = dimension.width - (insets.left + insets.right);      int usedAmount = insideWidth - (int)(((long)insideWidth * freeMemory) / totalMemory);      int insideHeight = dimension.height - (insets.bottom + insets.top);      Graphics2D g2 = (Graphics2D)g;      g2.setPaint(new GradientPaint(left, top, edgeColor, left, insideHeight / 2, centerColor, true));      g.fillRect(left, top, usedAmount, insideHeight);      g.setColor(getBackground());      g.fillRect(left + usedAmount, top, insideWidth - usedAmount, insideHeight);      g.setFont(getFont());      g.setColor(Color.black);      String memory = (Long.toString((totalMemory - freeMemory) / 1048576L) + "M of " + Long.toString(totalMemory / 1048576L) + 'M');      FontMetrics fontmetrics = g.getFontMetrics();      int stringWidth = fontmetrics.charsWidth(memory.toCharArray(), 0, memory.length());      int stringHeight = fontmetrics.getHeight() - fontmetrics.getDescent();      g.drawString(memory, left + (insideWidth - stringWidth) / 2, top + (insideHeight + stringHeight) / 2);    }  }  public MemoryDisplay()  {    super();    setLayout(new BorderLayout(5, 0));    panel = new MemoryPanel();    panel.setOpaque(false);    invokeGC = new JButton(gcIcon);    invokeGC.setRequestFocusEnabled(false);    invokeGC.setFocusable(false);    setBorder(new EmptyBorder(1, 1, 1, 1));    invokeGC.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));    invokeGC.setOpaque(false);	  invokeGC.setUI(new BlueButtonUI());    invokeGC.addActionListener(new ActionListener()    {	    public void actionPerformed(ActionEvent e)	    {		    System.gc();		    MemoryDisplay.this.panel.repaint();	    }    });    add(panel, BorderLayout.CENTER);    add(invokeGC, BorderLayout.WEST);    timer = new Timer(updateInterval, new ActionListener()    {      public void actionPerformed(ActionEvent actionevent)      {        MemoryDisplay.this.panel.repaint();      }    });    timer.start();  }  public int getPreferredWidth()  {    return 30 + getFontMetrics(getFont()).stringWidth("0000M of 0000M");  }  public String getItemName()  {    return "Memory";  }  public void setUpdateInterval(int i)  {    timer.stop();    updateInterval = i;    timer.setDelay(i);    timer.start();  }  public int getUpdateInterval()  {    return updateInterval;  }  public void removeNotify()  {    super.removeNotify();    stop();    timer = null;  }  public void stop()  {    timer.stop();  } }