java如何在编辑jtable单元格时检测按下enter键？

Question

我在jtable上有一个keylistener，这样当有人按下enter键时，就会进行一些计算。但是，只有当用户未进行编辑时，才会发生这种情况。当一个人完成编辑单元格并按enter键完成并关闭编辑时，我想应用此操作

我搞不懂，有人做过或者知道怎么做吗

基本上，现在要做的动作，人们必须按两次enter键，一次结束编辑，另一次我想做的动作，我想在编辑时只需要按一次

谢谢!

Answer 1

I have a keylistener on jtable so that when someone presses enter some calculations happen. However, this only happens if the person is not editing. I would like to apply this action when a person finishes editing a cell and is pressing enter to finish and close the editing.

• TableCellEditor没有将KeyListener添加到JTable中

Basically, now for the action to be done, people must press enter twice, one to end the editing and another for the action that I want to happen, I would like to make it needed only once, while editing.

• JComponents（用作TableCellEditor）默认情况下对按下ENTER键做出反应

• 不要将JComponent放入TableModel，应该只存储TableCellRenderer绘制的值和TableCellEditor的初始值

• TableCellEditor暂时是JComponent，如果用作TableCellEditor的JComponents对按下ENTER键没有反应，则必须添加KeyBindings来调用StopCellEdit

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• 这个问题与标准无关，为了获得更好的帮助，请尽快发布一个SSCCE、简短、可运行、可编译的、带有硬编码值的JTable/XxxTableModel

• 在阅读甲骨文教程之前How to use Tables，尤其是部分

  1. Creating a Table Model

  2. Concepts: Editors and Renderers

  3. Using Custom Renderers

Answer 2

您可以自定义自己的编辑器。使用DefaultCellEditor而不是使用KeyListener，应该使用KeyBindings

看看这个例子

            JTable table = new JTable(myModel);
            JTextField cell = new JTextField();
            final TableCellEditor cellEditor = new DefaultCellEditor(cell);
            table.getColumnModel().getColumn(column).setCellEditor(cellEditor);
            InputMap iMap = cell.getInputMap(JComponent.WHEN_FOCUSED);
            iMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0),    KeyEvent.getKeyText(KeyEvent.VK_ENTER));
            ActionMap aMap = cell.getActionMap();
            aMap.put(KeyEvent.getKeyText(KeyEvent.VK_ENTER), new AbstractAction() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    if(callSomeOperationsIsOk()){
                      cellEditor.stopCellEditing();
                    }else{
                      cellEditor.cancelCellEditing();
                    }
                }
            });
    }

阅读教程How to use Tables中的更多内容，也许你会遇到与我之前看到的question相同的问题

Answer 3

您可以重写JTable.editingStopped，编辑完成后会调用它，并在该方法中应用您的操作

编辑：

JTable.editingStopped不是为应用程序扩展而设计的。为了避免复杂性，尤其是平台依赖性复杂性，更好的方法是重写模型的setValueAt或注册TableModelListener。下面是一个例子：

import javax.swing.*;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.DefaultTableModel;

public class DemoTable3 {
    private static void createAndShowUI() {
        JFrame frame = new JFrame("DemoTable");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Object[][] rows = { { "Column 1", "Column 2" },
                { "Column 1", "Column 2" } };
        Object[] columns = { "Column 1", "Column 2" };

        DefaultTableModel model = new DefaultTableModel(rows, columns);
        model.addTableModelListener(new TableModelListener() {
            @Override
            public void tableChanged(TableModelEvent e) {
                System.out.println("apply additional action");
            }
        });

        JTable table = new JTable(model);
        frame.add(new JScrollPane(table));
        frame.setLocationByPlatform(true);
        frame.pack();
        frame.setVisible(true);
    }

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

另一种选择是添加CellEditorListener以捕获编辑的事件。例如：

import javax.swing.*;
import javax.swing.event.CellEditorListener;
import javax.swing.event.ChangeEvent;
import javax.swing.table.DefaultTableModel;

public class DemoTable2 {

    private static void createAndShowUI() {
        JFrame frame = new JFrame("DemoTable");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Object[][] rows = { { "Column 1", "Column 2" },
                { "Column 1", "Column 2" } };
        Object[] columns = { "Column 1", "Column 2" };

        final JTable table = new JTable(new DefaultTableModel(rows, columns));

        table.getDefaultEditor(String.class).addCellEditorListener(
                new CellEditorListener() {
                    public void editingCanceled(ChangeEvent e) {
                        System.out.println("editingCanceled");
                    }

                    public void editingStopped(ChangeEvent e) {
                        System.out.println("editingStopped: apply additional action");
                    }
                });

        frame.add(new JScrollPane(table));
        frame.setLocationByPlatform(true);
        frame.pack();
        frame.setVisible(true);
    }

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

还可以看看@camickr的Table Cell Listener，它提供了编辑的自定义处理