使用JTable單元格編輯器

Question

我不知道爲什麼編輯器我設置爲我的jtable沒有被調用。我用另一個SO Question的編輯器例子。

當我編輯我的jtable它只是編輯爲字符串...我期望它只接受數字值。可能會有一些例外，如果我輸入任何其他文字......但我不認爲編輯器在我編輯我的表時被調用。

import javax.swing.*; 
import javax.swing.table.*; 
import javax.swing.text.NumberFormatter; 

import java.awt.*; 
import java.awt.event.*; 
import java.text.DecimalFormat; 
import java.text.NumberFormat; 
import java.text.ParseException; 
import java.text.ParsePosition; 
import java.util.Locale; 

public class Grow extends JFrame { 

private static final Object[][] rowData = {{"Hello", "World"}}; 
private static final Object[] columnNames = {"A", "B"}; 

private JTable table; 
private DefaultTableModel model; 

public Grow() { 
    Container c = getContentPane(); 
    c.setLayout(new BorderLayout()); 

    model = new DefaultTableModel(rowData, columnNames); 
    table = new JTable(); 
    table.setModel(model); 
    c.add(new JScrollPane(table), BorderLayout.CENTER); 
    JButton add = new JButton("Add"); 
    JButton delete = new JButton("Delete"); 
    c.add(add, BorderLayout.LINE_START); 
    add.addActionListener(new ActionListener() { 
     public void actionPerformed(ActionEvent ae) { 
      model.addRow(rowData[0]); 
     } 
    }); 

    table.setCellEditor(new NumberCellEditor()); 

    c.add(delete, BorderLayout.LINE_END); 
    delete.addActionListener(new ActionListener() { 
     public void actionPerformed(ActionEvent ae) { 
      if(table.getSelectedRow()>-1) 
       model.removeRow(table.getSelectedRow()); 
     } 
    }); 

    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    pack(); 
} 

class NumberCellEditor extends DefaultCellEditor { 
    /** 
    * 
    */ 
    private static final long serialVersionUID = 1L; 

    public NumberCellEditor(){ 
     super(new JFormattedTextField()); 
    } 

    @Override 
    public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) { 
     JFormattedTextField editor = (JFormattedTextField) super.getTableCellEditorComponent(table, value, isSelected, row, column); 

     if (value!=null){ 
      DecimalFormat numberFormat = new DecimalFormat("#,##0.00;(#,##0.00)"); 
      editor.setFormatterFactory(new javax.swing.text.DefaultFormatterFactory(new javax.swing.text.NumberFormatter(numberFormat))); 
      Number num = (Number) value; 
      String text = numberFormat.format(num); 
      editor.setHorizontalAlignment(SwingConstants.RIGHT); 
      editor.setText(text); 
     } 
     System.out.println(value); 
     return editor; 
    } 

    /*@Override 
    public boolean stopCellEditing() { 
     try { 
      // try to get the value 
      //this.getCellEditorValue(); 
      return super.stopCellEditing(); 
     } catch (Exception ex) { 
      return false; 
     } 

    } 
    */ 

    @Override 
    public Object getCellEditorValue() { 
     // get content of textField 
     String str = (String) super.getCellEditorValue(); 
     if (str == null) { 
      return null; 
     } 

     if (str.length() == 0) { 
      return null; 
     } 

     // try to parse a number 
     try { 
      ParsePosition pos = new ParsePosition(0); 
      Number n = NumberFormat.getInstance().parse(str, pos); 
      if (pos.getIndex() != str.length()) { 
       throw new ParseException(
         "parsing incomplete", pos.getIndex()); 
      } 

      // return an instance of column class 
      return new Float(n.floatValue()); 

     } catch (ParseException pex) { 
      throw new RuntimeException(pex); 
     } 
    } 
    } 

public static void main(String[] args) { 
    Grow g = new Grow(); 
    g.setLocationRelativeTo(null); 
    g.setVisible(true); 
} 
} 

Answer 1

• 使用純香草JTextField與DocumentFilter代替JFormattedTextField爲編輯Component。

• 我不能評論什麼的，附start_point爲JFormattedTextField與XxxFormat（重要的細節在官方甲骨文教程，API的How to use FormattedTextField，NumberFormat等）

• 你可以添加爲InternationalFormatter的過濾僅數

eg

InternationalFormatter formatter = new InternationalFormatter(format); 
formatter.setAllowsInvalid(false); 
//formatter.setMinimum(0.0); 
//formatter.setMaximum(1000.00); 

screen_shot

從代碼

import java.awt.Component; 
import java.awt.EventQueue; 
import java.math.RoundingMode; 
import java.text.DecimalFormat; 
import java.text.NumberFormat; 
import java.text.ParseException; 
import javax.swing.*; 
import javax.swing.table.TableCellEditor; 
import javax.swing.table.TableCellRenderer; 
import javax.swing.table.TableColumnModel; 

public class EditorAsRendererTableTest { 

    public EditorAsRendererTableTest() { 
     JTable table = new JTable(3, 2); 
     TableColumnModel colModel = table.getColumnModel(); 
     colModel.getColumn(0).setCellEditor(new MyCellEditor()); 
     colModel.getColumn(0).setCellRenderer(new MyCellEditor()); 
     JFrame frame = new JFrame("Test"); 
     frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 
     table.setPreferredScrollableViewportSize(table.getPreferredSize()); 
     frame.add(new JScrollPane(table)); 
     frame.pack(); 
     frame.setLocationRelativeTo(null); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       new EditorAsRendererTableTest(); 
      } 
     }); 
    } 

    private class MyCellEditor extends AbstractCellEditor implements TableCellEditor, TableCellRenderer { 

     private static final long serialVersionUID = 1L; 
     private JFormattedTextField renderer; 
     private JFormattedTextField editor; 
     private NumberFormat format = DecimalFormat.getInstance(); 

     public MyCellEditor() { 
      format.setMinimumFractionDigits(2); 
      format.setMaximumFractionDigits(4); 
      format.setRoundingMode(RoundingMode.HALF_UP); 
      renderer = new JFormattedTextField(format); 
      renderer.setBorder(null); 
      editor = new JFormattedTextField(format); 
     } 

     @Override 
     public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { 
      renderer.setValue(value); 
      return renderer; 
     } 

     @Override 
     public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) { 
      editor.setValue(value); 
      return editor; 
     } 

     @Override 
     public boolean stopCellEditing() { 
      try { 
       editor.commitEdit(); 
      } catch (ParseException e) { 
       return false; 
      } 
      return super.stopCellEditing(); 
     } 

     @Override 
     public Object getCellEditorValue() { 
      return editor.getValue(); 
     } 
    } 
} 

Answer 2

我預期它僅接受數值

通常不需要創建自定義編輯器。只需重寫TableModel的getColumnClass（）方法以返回存儲在模型中的適當數據類，並且該表將使用適當的渲染器和編輯器。

但是，如果您希望編輯器限制小數位數或對數字進行範圍檢查，則可以使用自定義編輯器。