Java 如何使用JFormDesigner实现ListSelectionListener？

我试图获得一个按钮来启用/禁用自己，这取决于JTable是否选择了任何行

所以我认为我需要一个ListSelectionListener按钮，监听JTable的SelectionModel，如本文所述

我应该如何使用JFormDesigner 5实现这一点

似乎我应该向JButton添加以下代码，但我不知道如何在JFormDesigner中这样做

// Implementing this method to be a ListSelectionListener.
public void valueChanged(ListSelectionEvent e) {
    ListSelectionModel lsm = (ListSelectionModel)e.getSource();
    boolean anyRowsSelected = !(lsm.isSelectionEmpty());
    this.setEnabled( anyRowsSelected );
}

根据我在JFormDesigner中添加actionPerformed处理程序的经验，JFormDesigner在JFrame上创建了一个方法。但是我对Swing&OOP的理解是ListSelectionListener的代码应该在侦听小部件本身（在我的例子中是JButton）中

我使用的是：JFormDesigner 5.0.0.1、IntelliJ 10.5、Java 1.6.0_24、Mac OS X 10.6.7

--------解决-----------

感谢“装满鳗鱼的气垫船”回答了我的问题

import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;

public class TableAndButton extends JPanel {
   private static final String[] COLUMN_NAMES = {"Mon", "Tues", "Wed", "Thurs", "Fri"};
   private JButton button = new JButton("Clear user's selection");
   private DefaultTableModel model = new DefaultTableModel(COLUMN_NAMES, 10);
   private JTable table = new JTable(model);

   public TableAndButton() {
      JPanel btnPanel = new JPanel();
      btnPanel.add(button);

      table.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
         public void valueChanged(ListSelectionEvent e) {
            ListSelectionModel lsm = (ListSelectionModel)e.getSource();
            boolean anyRowSelected = !(lsm.isSelectionEmpty());
            button.setEnabled(anyRowSelected);
         }
      });

      button.addActionListener( new ActionListener() {
          public void actionPerformed(ActionEvent e) {
             table.getSelectionModel().clearSelection();
         }
      });

      button.setEnabled(false);

      setLayout(new BorderLayout());
      add(new JScrollPane(table), BorderLayout.CENTER);
      add(btnPanel, BorderLayout.PAGE_END);
   }

   private static void createAndShowUI() {
      JFrame frame = new JFrame("TableAndButton");
      frame.getContentPane().add(new TableAndButton());
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      java.awt.EventQueue.invokeLater(new Runnable() {
         public void run() {
            createAndShowUI();
         }
      });
   }
}

解决方案：我将向JFrame添加代码以创建ListSelectionListener。这样就可以在不干扰JFormDesigner工具的情况下完成工作

我增强了“布满鳗鱼的气垫船”给出的示例代码，使其更具交互性。我在按钮中添加了一个ActionListener来清除用户的选择。现在，用户可以看到按钮在启用和禁用之间切换

我的版本显示了一个微妙的错误：当表格的选择被清除时，所选单元格变黑。我不知道为什么。但这超出了这个问题的范围。不管这个bug如何，这段代码是这个问题的一个很好的演示

import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;

public class TableAndButton extends JPanel {
   private static final String[] COLUMN_NAMES = {"Mon", "Tues", "Wed", "Thurs", "Fri"};
   private JButton button = new JButton("Clear user's selection");
   private DefaultTableModel model = new DefaultTableModel(COLUMN_NAMES, 10);
   private JTable table = new JTable(model);

   public TableAndButton() {
      JPanel btnPanel = new JPanel();
      btnPanel.add(button);

      table.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
         public void valueChanged(ListSelectionEvent e) {
            ListSelectionModel lsm = (ListSelectionModel)e.getSource();
            boolean anyRowSelected = !(lsm.isSelectionEmpty());
            button.setEnabled(anyRowSelected);
         }
      });

      button.addActionListener( new ActionListener() {
          public void actionPerformed(ActionEvent e) {
             table.getSelectionModel().clearSelection();
         }
      });

      button.setEnabled(false);

      setLayout(new BorderLayout());
      add(new JScrollPane(table), BorderLayout.CENTER);
      add(btnPanel, BorderLayout.PAGE_END);
   }

   private static void createAndShowUI() {
      JFrame frame = new JFrame("TableAndButton");
      frame.getContentPane().add(new TableAndButton());
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      java.awt.EventQueue.invokeLater(new Runnable() {
         public void run() {
            createAndShowUI();
         }
      });
   }
}

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不，JButton本身不应该是ListSelectionListener，而是JTable需要添加一个单独的ListSelectionListener来启用/禁用JButton。不要认为按钮正在侦听JTable，因为它不是。相反，一个单独的实体正在进行侦听，并根据是否选择了行来更改程序的状态

e、 g

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1+很好地修改了我的代码。：）