在JTable中

Question

DnD的行自定义数据味道

我如何注册一个自定义数据的味道，这样，当我打电话

TransferHandler.TransferSupport.isDataFlavorSupported() 

返回true？

风味初始化像这样

private final DataFlavor localObjectFlavor = new ActivationDataFlavor(DataManagerTreeNode.class, DataFlavor.javaJVMLocalObjectMimeType, "DataManagerTreeNode flavour"); 

非常感谢

Answer 1

我只看到一次的JTable和DND，offical code by Oracle次正确的代码（前Sun）

import javax.swing.*; 
import javax.swing.table.*; 
import java.awt.*; 
import java.awt.datatransfer.*; 
import java.awt.event.*; 
import java.io.*; 

public class FillViewportHeightDemo extends JFrame implements ActionListener { 

    private static final long serialVersionUID = 1L; 
    private DefaultListModel model = new DefaultListModel(); 
    private int count = 0; 
    private JTable table; 
    private JCheckBoxMenuItem fillBox; 
    private DefaultTableModel tableModel; 

    private static String getNextString(int count) { 
     StringBuilder buf = new StringBuilder(); 
     for (int i = 0; i < 5; i++) { 
      buf.append(String.valueOf(count)); 
      buf.append(","); 
     } 
     buf.deleteCharAt(buf.length() - 1); // remove last newline 
     return buf.toString(); 
    } 

    private static DefaultTableModel getDefaultTableModel() { 
     String[] cols = {"Foo", "Toto", "Kala", "Pippo", "Boing"}; 
     return new DefaultTableModel(null, cols); 
    } 

    public FillViewportHeightDemo() { 
     super("Empty Table DnD Demo"); 
     tableModel = getDefaultTableModel(); 
     table = new JTable(tableModel); 
     table.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION); 
     table.setDropMode(DropMode.INSERT_ROWS); 
     table.setTransferHandler(new TransferHandler() { 

      private static final long serialVersionUID = 1L; 

      @Override 
      public boolean canImport(TransferSupport support) { 
       if (!support.isDrop()) { // for the demo, we'll only support drops (not clipboard paste) 
        return false; 
       } 
       if (!support.isDataFlavorSupported(DataFlavor.stringFlavor)) { // we only import Strings 
        return false; 
       } 
       return true; 
      } 

      @Override 
      public boolean importData(TransferSupport support) { // if we can't handle the import, say so    
       if (!canImport(support)) { 
        return false; 
       } 
       JTable.DropLocation dl = (JTable.DropLocation) support.getDropLocation();// fetch the drop location 
       int row = dl.getRow(); 
       String data; // fetch the data and bail if this fails 
       try { 
        data = (String) support.getTransferable().getTransferData(DataFlavor.stringFlavor); 
       } catch (UnsupportedFlavorException e) { 
        return false; 
       } catch (IOException e) { 
        return false; 
       } 
       String[] rowData = data.split(","); 
       tableModel.insertRow(row, rowData); 
       Rectangle rect = table.getCellRect(row, 0, false); 
       if (rect != null) { 
        table.scrollRectToVisible(rect); 
       } 
       model.removeAllElements(); // demo stuff - remove for blog 
       model.insertElementAt(getNextString(count++), 0); // end demo stuff 
       return true; 
      } 
     }); 
     JList dragFrom = new JList(model); 
     dragFrom.setFocusable(false); 
     dragFrom.setPrototypeCellValue(getNextString(100)); 
     model.insertElementAt(getNextString(count++), 0); 
     dragFrom.setDragEnabled(true); 
     dragFrom.setBorder(BorderFactory.createLoweredBevelBorder()); 
     dragFrom.addMouseListener(new MouseAdapter() { 

      @Override 
      public void mouseClicked(MouseEvent me) { 
       if (SwingUtilities.isLeftMouseButton(me) && me.getClickCount() % 2 == 0) { 
        String text = (String) model.getElementAt(0); 
        String[] rowData = text.split(","); 
        tableModel.insertRow(table.getRowCount(), rowData); 
        model.removeAllElements(); 
        model.insertElementAt(getNextString(count++), 0); 
       } 
      } 
     }); 
     JPanel p = new JPanel(); 
     p.setLayout(new BoxLayout(p, BoxLayout.X_AXIS)); 
     JPanel wrap = new JPanel(); 
     wrap.add(new JLabel("Drag from here:")); 
     wrap.add(dragFrom); 
     p.add(Box.createHorizontalStrut(4)); 
     p.add(Box.createGlue()); 
     p.add(wrap); 
     p.add(Box.createGlue()); 
     p.add(Box.createHorizontalStrut(4)); 
     getContentPane().add(p, BorderLayout.NORTH); 
     JScrollPane sp = new JScrollPane(table); 
     getContentPane().add(sp, BorderLayout.CENTER); 
     fillBox = new JCheckBoxMenuItem("Fill Viewport Height"); 
     fillBox.addActionListener(this); 
     JMenuBar mb = new JMenuBar(); 
     JMenu options = new JMenu("Options"); 
     mb.add(options); 
     setJMenuBar(mb); 
     JMenuItem clear = new JMenuItem("Reset"); 
     clear.addActionListener(this); 
     options.add(clear); 
     options.add(fillBox); 
     getContentPane().setPreferredSize(new Dimension(260, 180)); 
    } 

    @Override 
    public void actionPerformed(ActionEvent ae) { 
     if (ae.getSource() == fillBox) { 
      table.setFillsViewportHeight(fillBox.isSelected()); 
     } else { 
      tableModel.setRowCount(0); 
      count = 0; 
      model.removeAllElements(); 
      model.insertElementAt(getNextString(count++), 0); 
     } 
    } 

    private static void createAndShowGUI() {//Create and set up the window.   
     FillViewportHeightDemo test = new FillViewportHeightDemo(); 
     test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     test.pack(); //Display the window. 
     test.setVisible(true); 
    } 

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

      @Override 
      public void run() {//Turn off metal's use of bold fonts 
       UIManager.put("swing.boldMetal", Boolean.FALSE); 
       createAndShowGUI(); 
      } 
     }); 
    } 
}