TableModel setCellEditable 并自动将值设置回 false

Question

我目前正在尝试在我的 JTable 中实现一个 JPopupMenu，它允许使用

解锁单元格进行编辑

@Override 
public void actionPerformed(ActionEvent e){
    if(e.getActionCommand() == "Unlock"){
        pTableModel.setCellEditable(this.getSelectedRow(), this.getSelectedColumn(), true);
    }
}

这是TableModel中的相关方法

public void setCellEditable(int row, int col, boolean value) {
    editableCells[row][col] = value;
    this.fireTableCellUpdated(row, col); // I don't think I actually need this 
                                         //because nothing in the cell has changed yet?
}

isCellEditable() 然后 returns editableCells[][] 数组的值。但是当失去焦点时，我应该在我的代码中的哪个位置将单元格改回不可编辑状态？

稍微相关一点，我还想让单元格立即获得焦点。我读过 getEditorComponent().requestFocus() - 但这似乎不太正确，因为当时没有任何内容被编辑，单元格仅被 selected （并且使用该方法抛出 nullpointerexception 这似乎支持我的思考过程）。

有人能指出我正确的方向吗？我看不出哪里错了。谢谢

**编辑：为了在失去焦点时锁定单元格，我尝试添加一个带有 focusListener 的自定义 cellrenderer：

private class CustomCellRenderer extends DefaultTableCellRenderer{
    public CustomCellRenderer(){
        addFocusListener(new FocusAdapter(){
            @Override
            public void focusLost(FocusEvent e) {
                pTableModel.setCellEditable(getSelectedRow(), getSelectedColumn(), false);

            }
        });
    }
}

但这似乎也不起作用，但我可能实施不正确（虽然我已经检查过渲染器已添加）

SSCCE

import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.AbstractTableModel;

public class CellTest {    
    public static void main(String[] args){
        SwingUtilities.invokeLater(new Runnable(){
            @Override
            public void run(){
                createAndShowGUI();
            }
        });
    }
    private static void createAndShowGUI(){
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        MyPanel panel = new MyPanel();

        f.add(panel);
        f.pack();
        f.setVisible(true);
    }
}


class MyPanel extends JPanel implements ActionListener{
    private JTable table;
    private MyTableModel model;
    private JScrollPane sp;
    private List<Person> people;

    MyPanel(){
        people = new ArrayList<>();
        people.add(new Person("Will", 1));
        model = new MyTableModel(people);

        table = new JTable(model);
        table.addMouseListener(new MouseAdapter(){
            @Override
            public void mousePressed(MouseEvent e){
                maybeShowPopup(e);
            }
            @Override
            public void mouseReleased(MouseEvent e){
                maybeShowPopup(e);
            }
        });

        table.setFillsViewportHeight(true);
        sp = new JScrollPane(table);  
        this.add(sp);
    }

    @Override
    public void actionPerformed(ActionEvent e){
        if(e.getActionCommand().equals("Unlock")) {
                model.setCellEditable(table.getSelectedRow(),table.getSelectedColumn(),true);   
        }
    }

    private JPopupMenu createPopupMenu(){
        JPopupMenu pop = new JPopupMenu();
        JMenuItem item = new JMenuItem("Unlock");
        item.addActionListener(this);
        pop.add(item);
        return pop;
    }

    private void maybeShowPopup(MouseEvent e){
        int currentRow = table.rowAtPoint(e.getPoint());
        if(currentRow >= 0 && currentRow < table.getRowCount())
            table.setRowSelectionInterval(currentRow, currentRow);
        else
            table.clearSelection();

        if(table.getSelectedRow() < 0) return;
        if(e.isPopupTrigger() && e.getComponent() instanceof JTable){
            JPopupMenu pop = createPopupMenu();
            pop.show(e.getComponent(), e.getX(), e.getY());
        }
    }
}

以及 TableModel 和数据 class:

class MyTableModel extends AbstractTableModel{
    private List<Person> data;  
    private String[] colNames = new String[]{"Name","Age"};
    private boolean[][] editableCells;

    public MyTableModel(List<Person> data){
        this.data = data;
        this.editableCells = new boolean[this.getRowCount()][this.getColumnCount()];
    }

    @Override
    public int getRowCount() { return data.size(); }

    @Override
    public int getColumnCount() { return colNames.length; }

    @Override
    public Object getValueAt(int row, int col){
        Person p = data.get(row);
        switch(col){
            case 0 : return p.getName();
            case 1 : return p.getAge();
        }
        return null;
    }

    @Override
    public boolean isCellEditable(int row, int col){
        return editableCells[row][col];
    }

    public void setCellEditable(int row, int col, boolean value){
        editableCells[row][col] = value;
    }

    @Override
    public void setValueAt(Object value, int row, int col){
        Person p = data.get(row);
        switch(col){
            case 0 : p.setName((String)value);break;
            case 1 : p.setAge((int)value);break;
        }
        this.setCellEditable(row, col, false);
        this.fireTableCellUpdated(row, col);
    }

    public void setData(List<Person> data){
        this.data = data;
        this.fireTableDataChanged();
    }
}

class Person {
    private String name;
    private int age;

    public Person(String name, int age){
        this.name = name;
        this.age = age;
    }

    public void setName(String name){ this.name = name;}
    public String getName(){ return name; }
    public void setAge(int age){ this.age = age;}
    public int getAge(){ return age; }
}

对长度表示歉意 - 我不知道如何缩短它，而不会糟糕地重新创建我想要实现的目标。此代码中存在一个错误，即要右键单击并且 'Unlock' 您必须已经左键单击了一行，否则它们将是 arrayIndexOutOfBounds 异常。我还没有找到确切的原因。

但基本上当您右键单击然后 select 解锁时，我希望光标出现在单元格中。此时您单击解锁，然后必须双击该单元格。

Answer 1

but where in my code should I change the cell back to uneditable when focus is lost? -

你可以：

覆盖 TableModel 的 setValueAt(...) 方法，使单元格在数据更改后不可编辑。
使用一个TableModelListener它会在某个单元格的数据更新时产生一个事件。

TableModel setCellEditable 并自动将值设置回 false

TableModel setCellEditable and automatically setting the value back to false

java

swing

jtable