在基于JTable面板的单元格编辑器中丢失第一个字符

我有一个单元格编辑器，其中包含一个小按钮，然后是一个文本字段，可用于编辑内联值我使用setSurrendersFocusOnKeystroke（true）和一个焦点监听器，以允许用户立即从键盘开始编辑，但问题是按下的fisrt键似乎被消耗而不是被添加到文本字段，我该如何防止这种情况？完整的自包含示例如下

import javax.swing.*;
import java.awt.*;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;

public class PanelTableEditorTest extends JFrame {

    private JTable table;

    public PanelTableEditorTest() {
        this.setLayout(new BorderLayout());
        table = new JTable(10, 10);
        table.getSelectionModel().setSelectionMode(
            ListSelectionModel.SINGLE_SELECTION);
        table.setCellSelectionEnabled(true);
        table.setDefaultEditor(Object.class, new SimpleMultiRowCellEditor());
        table.setSurrendersFocusOnKeystroke(true);
        table.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT)
            .put(KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_F2, 0),
            "none");
        table.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT)
            .put(KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_ENTER, 0),
            "startEditing");
        this.add(table.getTableHeader(), BorderLayout.NORTH);
        this.add(table, BorderLayout.CENTER);
        pack();
        setVisible(true);
    }

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

            public void run() {
                new PanelTableEditorTest();
            }
        });
    }

    public class SimpleMultiRowCellEditor extends DefaultCellEditor {

        final JPanel panel;
        private final JButton rowCount;

        public SimpleMultiRowCellEditor() {
            super(new JTextField());
            this.setClickCountToStart(1);

            rowCount = new JButton();
            rowCount.setVisible(true);
            panel = new JPanel();
            panel.setOpaque(false);
            panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));
            panel.add(rowCount);
            panel.add(editorComponent);
            panel.addFocusListener(new PanelFocusListener());
        }

        public Component getTableCellEditorComponent(
            final JTable table,final Object val, final boolean isSelected,
            final int row, final int column) {
            rowCount.setText("1");
            delegate.setValue(val);
            editorComponent.requestFocusInWindow();
            return panel;
        }

        class PanelFocusListener implements FocusListener {

            public void focusGained(FocusEvent e) {
                editorComponent.requestFocusInWindow();
            }

            public void focusLost(FocusEvent e) {
            }
        }
    }
}

已邀请:

2 个回复

岭取

所以我找到了一个解决方案，感谢这篇文章http://jroller.com/santhosh/entry/keyboard_handling_in_tablecelleditor，以及一些有用的讨论，以及它如何应用于http://forums.java.net上的其他组件/jive/thread.jspa?messageID=482236&#482236 不完全理解解决方案这整个区域似乎是一个雷区我还添加了这个解决方案使用java DefaultCellEditor在JTable中获取正确的编辑行为，这样当你开始使用键盘编辑一个字段时，现有值会被替换，但是当你双击字段时则不会。我的一个困惑是，我没有像我期望的那样收到一个关键事件，但只是因为我必须考虑到这一点。我已经从使用setSurrenderKeystrokes（true）回来了，因为这会导致其他编辑器出现问题，例如简单的textfieldingitor

import javax.swing.*;
import javax.swing.text.Caret;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.util.EventObject;

public class PanelTableEditorTest extends JFrame
{

    private JTable table;

    public PanelTableEditorTest()
    {
        try
        {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        }
        catch(Exception e)
        {

        }
        this.setLayout(new BorderLayout());
        table = new JTable(4, 4);
        table.getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        table.setCellSelectionEnabled(true);
        table.setSurrendersFocusOnKeystroke(false);
        table.setDefaultEditor(Object.class,new SimpleMultiRowCellEditor());
        table.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(KeyStroke.getKeyStroke(java.awt.event.
                        KeyEvent.VK_F2, 0), "none");
        table.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(KeyStroke.getKeyStroke(java.awt.event.
                        KeyEvent.VK_ENTER, 0), "startEditing");

        this.add(table.getTableHeader(), BorderLayout.NORTH);

        this.add(table, BorderLayout.CENTER);
        pack();
        setVisible(true);
    }

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

            }
        });
    }

    public class SimpleMultiRowCellEditor extends DefaultCellEditor
    {
        private EventObject event;
        final JPanel panel;
        private final JButton rowCount;

        public SimpleMultiRowCellEditor()
        {
            super(new JTextField());
            this.setClickCountToStart(1);

            rowCount = new JButton();
            rowCount.setVisible(true);
            panel = new TableEditorPanel();
            panel.setRequestFocusEnabled(true);
            panel.setOpaque(false);
            panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));
            panel.add(rowCount);
            panel.add(editorComponent);
        }

        public boolean isCellEditable(EventObject anEvent)
        {
            event=anEvent;
            return super.isCellEditable(anEvent);
        }

        public Component getTableCellEditorComponent(final JTable table, final Object val, final boolean isSelected, final int row, final int column)
        {
            rowCount.setText("1");
            delegate.setValue(val);
            if(event instanceof KeyEvent || event==null)
            {
                final Caret caret = ((JTextField)editorComponent).getCaret();
                caret.setDot(0);
                ((JTextField)editorComponent).setText("");                
            }
            return panel;
        }

        class TableEditorPanel extends JPanel
        {

            public void addNotify(){
                super.addNotify();
                editorComponent.requestFocus();
            }

            protected boolean processKeyBinding(KeyStroke ks, KeyEvent e, int condition, boolean pressed){
                InputMap map = editorComponent.getInputMap(condition);
                ActionMap am = editorComponent.getActionMap();

                if(map!=null && am!=null && isEnabled()){
                    Object binding = map.get(ks);
                    Action action = (binding==null) ? null : am.get(binding);
                    if(action!=null){
                        return SwingUtilities.notifyAction(action, ks, e, editorComponent,
                                e.getModifiers());
                    }
                }
                return false;
            }
        }
    }
}

导力疵谜

添加一个 rowCount.setFocusable（假）; 在SimpleMultiRowCellEditor构造函数中，为了防止按钮检索焦点，使JTextfield是唯一可以如何关注单元格版本的

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在基于JTable面板的单元格编辑器中丢失第一个字符

2 个回复

发起人

tablecelleditor

问题状态

在基于JTable面板的单元格编辑器中丢失第一个字符

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2 个回复

发起人

tablecelleditor

问题状态