Question

我试图将JLabel放入我的Swing JTable中，但我得到的显然是对象的名称：

enter image description here

这是我用来将JLabel加载到我的表中的类：

    /**
       * Main Class.
       */

    public class Test extends JFrame {

      private static final long serialVersionUID = 1L;

      private JPanel contentPane;
      private MyTable tableDest;
      private MyTable tableSource;

      /**
       * Launch the application.
       */
      public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
          @Override
          public void run() {
            try {
              Test frame = new Test();
              frame.setVisible(true);
            }
            catch (Exception e) {
              e.printStackTrace();
            }
          }
        });
      }

      /**
       * Create the frame.
     * @throws Exception 
       */
      public Test() throws Exception {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);

        JSplitPane splitPane = new JSplitPane();
        splitPane.setResizeWeight(0.5);
        contentPane.add(splitPane, BorderLayout.CENTER);


        tableSource = new MyTable(true);
        splitPane.setRightComponent(tableSource);

        tableDest = new MyTable(false);
        splitPane.setLeftComponent(tableDest);


        TransferHandler transferHandler = new MyTransferHandler();

        tableSource.setDragEnabled(true);
        tableSource.setTransferHandler(transferHandler);
        tableSource.setDropMode(DropMode.ON);


        tableDest.setDragEnabled(true);
        tableDest.setTransferHandler(transferHandler);
        tableDest.setDropMode(DropMode.ON);
      }
    }


     /**
       * Class for The Table
       */


      class MyTable extends JTable {

      private static final long serialVersionUID = 1L;

      public MyTable(boolean withData) throws Exception {
        this( new MyTableModel(withData));
      }

      public MyTable(MyTableModel tableModel) {
        super(tableModel);
        setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
      }

      @Override
      public MyTableModel getModel() {
        return (MyTableModel)super.getModel();
      }
    }

    /**
       * Class for The JPanel import into The table
       */

    class MyTableModel extends AbstractTableModel {

    private static final long serialVersionUID = 1L;

      private JLabel[] dataSource = new JLabel[16];

      public MyTableModel(boolean fill) {
        if(fill) {
          for(int i = 0; i < dataSource.length; i++) {
            dataSource[i] = new JLabel("<html>Text color: <font color='red'>red</font></html>");
          }
        }
      }

      @Override
      public int getRowCount() {
        return 4;
      }

      @Override
      public int getColumnCount() {
        return 4;
      }

      @Override
      public Object getValueAt(int row, int col) {
        int index = getIndex(row, col);
        return dataSource[index];
      }

      @Override
      public void setValueAt(Object aValue, int row, int col) {
        int index = getIndex(row, col);
        dataSource[index] = (JLabel)aValue;
      }

      @Override
      public Class<?> getColumnClass(int col) {
        return JLabel.class;
      }

      public void removeAt(int row, int col) {
        int index = getIndex(row, col);
        dataSource[index] = null;
        fireTableCellUpdated(row, col);
      }

      private int getIndex(int row, int col) {
        return row*4 + col;
      }
}

    /**
       * Class for the drag'n drop Stuff
       */

     class MyTransferHandler extends TransferHandler {

      private static final long serialVersionUID = 1L;


      @Override
      public int getSourceActions(JComponent comp) {
        return MOVE;
      }

      int selectedRow;
      int selectedCol;


      @Override
      public Transferable createTransferable(JComponent comp) {
        System.out.println("createTransferable");

        MyTable table = (MyTable)comp;
        selectedRow = table.getSelectedRow();
        selectedCol = table.getSelectedColumn();

        String text = (String) table.getValueAt(selectedRow, selectedCol);
        System.out.println("DND init for: " + text);
        return new StringSelection(text);
      }

      @Override
      public void exportDone(JComponent comp, Transferable trans, int action) {
        System.out.println("exportDone");

        if (action == MOVE) {
          MyTable table = (MyTable)comp;
          table.getModel().removeAt(selectedRow, selectedCol);
        }
      }

      @Override
      public boolean canImport(TransferSupport support) {
        //System.out.println("canImport");
        return support.isDrop();
      }

      @Override
      public boolean importData(TransferSupport support) {
        System.out.println("importData");
        if(canImport(support)) { //to prevent from paste's

          DropLocation dl = support.getDropLocation();
          Point dropPoint = dl.getDropPoint();

          String data;
          try {
              data = (String)support.getTransferable().getTransferData(DataFlavor.stringFlavor);
              System.out.println("DND received: " + data);
          } catch (UnsupportedFlavorException | IOException e) {
              return false;
          }

          MyTable table = (MyTable)support.getComponent();
          int row = table.rowAtPoint(dropPoint);
          int col = table.columnAtPoint(dropPoint);

          MyTableModel model = table.getModel();
          Object currentValue = model.getValueAt(row, col);
          if(currentValue == null) { //if there's currently no value on that cell
            model.setValueAt(data, row, col);
            model.fireTableCellUpdated(row, col);
            return true;
          }
        }
        return false;
      }
    }

我做错了什么？它不应该显示JPanel而不是此文字。

Answer 1

我试图将JLabel放入我的Swing Table中，但我得到的只是对象的名称。

JLabel是JTable中单元格的默认组件。我假设您在默认值中添加了JLabel，这导致其toString方法被调用并显示在默认标签中。

enter image description here

在这里，我创建了一个新的JTable并将您的String放在所有单元格中：

public class Test extends JFrame {

    static String data = "<html>Text color: <font color='red'>red</font></html>";
    static int size = 4;

    public Test() {

        JTable table = new JTable(size, size);
        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {
                table.getModel().setValueAt(data, i, j);
            }
        }
        add(table);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setVisible(true);
    }

    public static void main(String[] args) {

        new Test();
    }
}

将JLabel放入Swing表时出现问题

1 个答案: