doublearrayeditorpanel.java

java的五个源代码

/**
 * @version 1.20 1999-09-28
 * @author Cay Horstmann
 */

import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.lang.reflect.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.event.*;

public class DoubleArrayEditorPanel extends JPanel
{  public DoubleArrayEditorPanel(PropertyEditorSupport ed)
   {  editor = ed;
      setArray((double[])ed.getValue());

      setLayout(new GridBagLayout());
      GridBagConstraints gbc = new GridBagConstraints();

      gbc.weightx = 100;
      gbc.weighty = 0;
      gbc.fill = GridBagConstraints.HORIZONTAL;

      add(sizeField, gbc, 0, 0, 1, 1);
      add(valueField, gbc, 0, 1, 1, 1);

      gbc.fill = GridBagConstraints.NONE;

      add(sizeButton, gbc, 1, 0, 1, 1);
      add(valueButton, gbc, 1, 1, 1, 1);

      sizeButton.addActionListener(
         new ActionListener()
         {  public void actionPerformed(ActionEvent event)
            {  changeSize();
            }
         });

      valueButton.addActionListener(
         new ActionListener()
         {  public void actionPerformed(ActionEvent event)
            {  changeValue();
            }
         });

      gbc.weighty = 100;
      gbc.fill = GridBagConstraints.BOTH;

      add(new JScrollPane(elementList), gbc, 0, 2, 2, 1);

      elementList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

      elementList.addListSelectionListener(
         new ListSelectionListener()
         {  public void valueChanged(ListSelectionEvent event)
            {  int i = elementList.getSelectedIndex();
               if (i < 0) return;
               valueField.setText("" + array[i]);
            }
         });

      elementList.setModel(model);
      elementList.setSelectedIndex(0);
   }

   public void add(Component c, GridBagConstraints gbc,
      int x, int y, int w, int h)
   {  gbc.gridx = x;
      gbc.gridy = y;
      gbc.gridwidth = w;
      gbc.gridheight = h;
      add(c, gbc);
   }

   public void changeSize()
   {  fmt.setParseIntegerOnly(true);
      int s = 0;
      try
      {  s = fmt.parse(sizeField.getText()).intValue();
         if (s < 0)
            throw new ParseException("Out of bounds", 0);
      }
      catch(ParseException e)
      {  JOptionPane.showMessageDialog(this, "" + e,
            "Input Error", JOptionPane.WARNING_MESSAGE);
         sizeField.requestFocus();
         return;
      }
      if (s == array.length) return;
      setArray((double[])arrayGrow(array, s));
      editor.setValue(array);
      editor.firePropertyChange();
   }

   public void changeValue()
   {  double v = 0;
      fmt.setParseIntegerOnly(false);
      try
      {  v = fmt.parse(valueField.getText()).doubleValue();
      }
      catch(ParseException e)
      {  JOptionPane.showMessageDialog(this, "" + e,
            "Input Error", JOptionPane.WARNING_MESSAGE);
         valueField.requestFocus();
         return;
      }
      int currentIndex = elementList.getSelectedIndex();
      setArray(currentIndex, v);
      editor.firePropertyChange();
   }

   static Object arrayGrow(Object a, int newLength)
   {  Class cl = a.getClass();
      if (!cl.isArray()) return null;
      Class componentType = a.getClass().getComponentType();
      int length = Array.getLength(a);

      Object newArray = Array.newInstance(componentType,
         newLength);
      System.arraycopy(a, 0, newArray, 0,
         Math.min(length, newLength));
      return newArray;
   }

   public double[] getArray()
   {  return (double[])array.clone();
   }

   public void setArray(double[] v)
   {  if (v == null) array = new double[0];
      else array = v;
      model.setArray(array);
      sizeField.setText("" + array.length);
      if (array.length > 0)
      {  valueField.setText("" + array[0]);
         elementList.setSelectedIndex(0);
      }
      else
         valueField.setText("");
   }

   public double getArray(int i)
   {  if (0 <= i && i < array.length) return array[i];
      return 0;
   }

   public void setArray(int i, double value)
   {  if (0 <= i && i < array.length)
      {  model.setValue(i, value);
         elementList.setSelectedIndex(i);
         valueField.setText("" + value);
      }
   }

   private PropertyEditorSupport editor;
   private double[] array;
   private NumberFormat fmt = NumberFormat.getNumberInstance();
   private JTextField sizeField = new JTextField(4);
   private JTextField valueField = new JTextField(12);
   private JButton sizeButton = new JButton("Resize");
   private JButton valueButton = new JButton("Change");
   private JList elementList = new JList();
   private DoubleArrayListModel model = new DoubleArrayListModel();
}

class DoubleArrayListModel extends AbstractListModel
{  public int getSize()
   {  return array.length;
   }

   public Object getElementAt(int i)
   {  return "[" + i + "] " + array[i];
   }

   public void setArray(double[] a)
   {  int oldLength = array == null ? 0 : array.length;
      array = a;
      int newLength = array == null ? 0 : array.length;
      if (oldLength > 0) fireIntervalRemoved(this, 0, oldLength);
      if (newLength > 0) fireIntervalAdded(this, 0, newLength);
   }

   public void setValue(int i, double value)
   {  array[i] = value;
      fireContentsChanged(this, i, i);
   }

   double[] array;
}