SelectedRow更改，當按下向上或向下時，JTable

Question

我有一個JTable。我想當我按下或鍵盤上的按鈕時，JTable中的rowsorter也會改變。

Answer 1

• 必須添加KeyBinding到JTableHeader

• 有三種狀態ASCENDING，DESCENDING和UNSORTED

簡單的例子約RowSorter和F8

import java.awt.*; 
import java.awt.event.*; 
import java.util.Arrays; 
import java.util.ArrayList; 
import java.util.List; 
import javax.swing.*; 
import javax.swing.table.*; 
import javax.swing.RowSorter.SortKey; 

class SelectedColumnTest { 

    private JPopupMenu popup = new JPopupMenu(); 
    private JTableHeader header; 
    private Object selectedColumn = null; 
    private String[] columnNames = {"String", "Integer", "Boolean"}; 
    private Object[][] data = {{"aaa", 12, true}, {"bbb", 5, false}, {"CCC", 92, true}}; 
    private TableModel model = new DefaultTableModel(data, columnNames) { 

     private static final long serialVersionUID = 1L; 

     @Override 
     public Class<?> getColumnClass(int column) { 
      return getValueAt(0, column).getClass(); 
     } 
    }; 
    private JTable table = new JTable(model); 

    public JComponent makeUI() { 
     table.setRowSorter(new TableRowSorter<TableModel>(model) { 

      @Override 
      public void toggleSortOrder(int column) { 
      } 
     }); 
     header = table.getTableHeader(); 
     header.getActionMap().put("toggleSortOrder2", new AbstractAction() { 

      private static final long serialVersionUID = 1L; 

      @Override 
      public void actionPerformed(ActionEvent e) { 
       e.setSource(table); 
       table.getActionMap().get("focusHeader").actionPerformed(e); 
       if (selectedColumn != null) { 
        int i = header.getColumnModel().getColumnIndex(selectedColumn); 
        SortOrder order = SortOrder.ASCENDING; 
        List<SortKey> keys = new ArrayList<SortKey>(table.getRowSorter().getSortKeys()); 
        if (!keys.isEmpty()) { 
         SortKey sortKey = keys.get(0); 
         if (sortKey.getColumn() == i && sortKey.getSortOrder() == SortOrder.ASCENDING) { 
          order = SortOrder.DESCENDING; 
         } 
        } 
        table.getRowSorter().setSortKeys(Arrays.asList(new SortKey(i, order))); 
       } 
       header.repaint(); 
      } 
     }); 
     InputMap im = header.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT); 
     im.put(KeyStroke.getKeyStroke(KeyEvent.VK_F8, 0), "toggleSortOrder2"); 
     header.addMouseListener(new MouseAdapter() { 

      @Override 
      public void mouseClicked(MouseEvent e) { 
       JTableHeader h = (JTableHeader) e.getSource(); 
       int i = h.columnAtPoint(e.getPoint()); 
       Object o = h.getColumnModel().getColumn(i).getHeaderValue(); 
       /*if (SwingUtilities.isRightMouseButton(e) && e.getClickCount() == 1) { 
        if (i < 0 || o == selectedColumn) { 
         selectedColumn = null; 
         popup.show(e.getComponent(), e.getX(), e.getY()); 
         return; 
        } 
        selectedColumn = o; 
       } else*/ if (SwingUtilities.isLeftMouseButton(e) && e.getClickCount() == 1) { 
        if (i < 0 || o == selectedColumn) { 
         selectedColumn = null; 
         return; 
        } 
        selectedColumn = o; 
        h.requestFocusInWindow(); 
       } 
      } 
     }); 
     final TableCellRenderer hr = table.getTableHeader().getDefaultRenderer(); 
     header.setDefaultRenderer(new TableCellRenderer() { 

      @Override 
      public Component getTableCellRendererComponent(JTable t, Object v, 
        boolean isS, boolean hasF, int row, int col) { 
       return (v == selectedColumn) ? hr.getTableCellRendererComponent(
         t, v, true, true, row, col) : hr.getTableCellRendererComponent(
         t, v, false, false, row, col); 
      } 
     }); 
     header.setToolTipText("Sorting by F8"); 
     JPanel p = new JPanel(new BorderLayout()); 
     p.add(new JScrollPane(table)); 
     createPopupMenu(); 
     return p; 
    } 

    private void createPopupMenu() { 
     popup = new JPopupMenu(); 
     JMenuItem myMenuItem1 = new JMenuItem("cccccccccccccccccccccc"); 
     JMenuItem myMenuItem2 = new JMenuItem("bbbbbbbbbbbbbbbbbbbbbb"); 
     popup.add(myMenuItem1); 
     popup.add(myMenuItem2); 
     MouseListener popupListener = new PopupListener(popup); 
     header.addMouseListener(popupListener); 
    } 

    private class PopupListener extends MouseAdapter { 

     private JPopupMenu popup; 

     PopupListener(JPopupMenu popupMenu) { 
      popup = popupMenu; 
     } 

     @Override 
     public void mousePressed(MouseEvent e) { 
      maybeShowPopup(e); 
     } 

     @Override 
     public void mouseReleased(MouseEvent e) { 
      maybeShowPopup(e); 
     } 

     private void maybeShowPopup(MouseEvent e) { 
      if (e.isPopupTrigger()) { 
       popup.show(e.getComponent(), e.getX(), e.getY()); 
      } 
     } 
    } 

    public static void main(String[] args) { 
     EventQueue.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       createAndShowGUI(); 
      } 
     }); 
    } 

    public static void createAndShowGUI() { 
     JFrame f = new JFrame(); 
     f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
     f.getContentPane().add(new SelectedColumnTest().makeUI()); 
     f.setSize(320, 240); 
     f.setLocationRelativeTo(null); 
     f.setVisible(true); 
    } 
}