TableCellRenderer & TableCellEditor（三）

 上文实现了renderer复用editor的功能，那么反过来editor是否也可以复用renderer的功能呢?而且第一篇提到“通过Java2D来绘制各种天花乱坠的效果”如何实现?这俩个疑问在以下代码中都有了很好的解答，里面有不少技术细节，我就不多说了大家自己仔细看看。


import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;

public class TableTest3 extends JFrame {

 JTable table;
 Double[] values = new Double[]{new Double(0.1), new Double(0.3), new Double(0.8)};
 
 // model
 class TableModel extends AbstractTableModel{
  public int getColumnCount() {
   return 2;
  }
  public int getRowCount() {
   return values.length;
  }
  public Object getValueAt(int rowIndex, int columnIndex) {
   return values[rowIndex];
  }
  public void setValueAt(Object value, int rowIndex, int columnIndex) {
   values[rowIndex] = (Double)value;
   this.fireTableCellUpdated(rowIndex, 0);
  }
     public String getColumnName(int columnIndex) {
   if(columnIndex == 0){
    return "plain";
   }else{
    return "beauty";
   }
     }
     public boolean isCellEditable(int rowIndex, int columnIndex) {
   if(columnIndex == 0){
    return false;
   }else{
    return true;
   }
     }
 }
 
 // cell editor
 class Editor extends AbstractCellEditor implements TableCellEditor, ActionListener {
  JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 50);
  TableCellRenderer renderer;
  JButton actionButton;
  
     Object value;
     JTable table;
     int row;
     int column;
    
     JPanel panel = new JPanel(new BorderLayout());
    
     public Editor(TableCellRenderer renderer){
         this.renderer = renderer;   
         actionButton = new JButton(new ImageIcon(TableTest3.class.getResource("dotdotdot.gif")));
         actionButton.addActionListener(this);
         actionButton.setFocusable(false);
         actionButton.setFocusPainted(false);
         actionButton.setMargin(new Insets(0, 0, 0, 0));         
         panel.add(actionButton, BorderLayout.EAST);
     }
 
     public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column){
      this.value = value;
         this.table = table;
         this.row = row;
         this.column = column;
         panel.add(renderer.getTableCellRendererComponent(table, value, true, isSelected, row, column));
         return panel;
     }
 
     public Object getCellEditorValue(){
         return value;
     }

  public void actionPerformed(ActionEvent e) {
         int intValue = (int)(((Number)value).doubleValue() * 100);
         slider.setValue(intValue);
         
         int result = JOptionPane.showOptionDialog(TableTest3.this,
                 slider, "change value",
                 JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE, null, null, null);
        
         if(result==JOptionPane.OK_OPTION) {
          this.value = new Double(slider.getValue()/100.0);
             this.fireEditingStopped();
         }else{
          this.fireEditingCanceled();
         }
  }

 }
 
 // cell render
 class Renderer extends JComponent implements TableCellRenderer{  
  Border noFocusBorder = new EmptyBorder(1, 1, 1, 1);
  Border focusBorder = UIManager.getBorder("Table.focusCellHighlightBorder");
  
  private boolean hasFocus;
  private Double value;
  
     public void paintComponent(Graphics g) {
      super.paintComponent(g);
      
      if(hasFocus){
       this.setBorder(focusBorder);
      }else{
       this.setBorder(noFocusBorder);
      }
      Dimension size = this.getSize();
      
      Graphics2D g2 = (Graphics2D) g;
      g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
         GradientPaint gp = new GradientPaint(0, 0, Color.BLUE, size.width, 0, Color.YELLOW, true);
         g2.setPaint(gp);
         g2.fillRect(0, 0, size.width, size.height);
      
         g2.setColor(Color.GREEN);
      double r = (size.height - 8) / 2.0;
      int centerX = (int)(size.width * value.doubleValue());
      int centerY = (int)r;
      g2.fill(new Ellipse2D.Double(centerX-r, centerY-r+4, r * 2, r * 2));
     }
    
  public Component getTableCellRendererComponent(JTable table, Object value,
    boolean isSelected, boolean hasFocus, int row, int column) {
   this.hasFocus = hasFocus;
   this.value = (Double)value;
      this.setToolTipText(value + "");
   return this;
  }
 }

 
 public TableTest3(){
  super("renderer used by editor");
  table = new JTable(new TableModel());
  TableColumn tableColumn = table.getColumnModel().getColumn(1);
  tableColumn.setCellRenderer(new Renderer());
  tableColumn.setCellEditor(new Editor(new Renderer()));
  
        this.getContentPane().setLayout(new BorderLayout());
        this.getContentPane().add(new JScrollPane(table), BorderLayout.CENTER);
        this.setSize(500, 300);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 }

 public static void main(String[] args) {
  new TableTest3().show();

 }

}