• 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();
     }
    }


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  • 原文地址:https://www.cnblogs.com/gwq369/p/5363206.html
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