java - 使光标在 JTable 内的 JTextField 中可见，无需左键单击

Question

我正在尝试在 JTable 中编辑 JTextField，而无需左键单击单元格。看来，如果不左键单击单元格，就不会获得焦点，并且在 JTextField 中看不到光标。右键单击单元格应使 JTextField 可编辑，并且光标应可见并闪烁，准备在 JTextField 中键入。

我发现了很多有类似问题的人的例子，但他们的差异足够大，以至于我无法将任何解决方案应用于我的代码(也许缺乏经验和脑力？)。

下面的代码是真实代码的脏副本，我目前无法访问。如果我在 JTable 中显示 JTextField 的实现不正确，请告诉我。

任何帮助或建议将不胜感激。谢谢

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.LinkedList;
import java.util.List;
import javax.swing.AbstractCellEditor;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;


public class EditableJTextFieldInJTable implements MouseListener{

 protected List<JTextField> textFields;
 protected JTable table;

    public EditableJTextFieldInJTable(){

        textFields = new LinkedList<JTextField>();

        JTextField tf1 = new JTextField("number 1");
    tf1.setBackground(Color.yellow);
    tf1.setEditable(false);
    textFields.add(tf1);

    JTextField tf2 = new JTextField("number 2");
    tf2.setEditable(false);
    tf2.setBackground(Color.green);
    textFields.add(tf2);

    TableModel tableModel = new TableModel();
    table = new JTable(tableModel);
    table.addMouseListener(this);
    table.setDefaultRenderer(Object.class, new CellRenderer());
    table.setDefaultEditor(Object.class, new CellEditor());     
    table.setTableHeader(null);

    JFrame frame = new JFrame("Table Cell Edit Test");
    frame.setPreferredSize(new Dimension(800, 480));
    frame.getContentPane().add(new JScrollPane(table));
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);

}


private class TableModel extends AbstractTableModel{

    @Override
    public int getColumnCount(){
        return 1;
    }

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

    @Override
    public Object getValueAt(int row, int col){
        return textFields.get(row);
    }

    @Override
    public boolean isCellEditable(int row, int col){
        return textFields.get(row).isEditable();        
    }

}


public class CellRenderer implements TableCellRenderer{

    public Component getTableCellRendererComponent(JTable table, Object value,
        boolean isSelected, boolean hasFocus, int row, int col){
        return textFields.get(row);
    }

}


public class CellEditor extends AbstractCellEditor implements TableCellEditor{

    public Component getTableCellEditorComponent(JTable table, Object value,
          boolean isSelected, int row, int col){
        JTextField textField = textFields.get(row);
        return textField;
    }

    @Override
    public Object getCellEditorValue(){
        return null;
    }

}


@Override
public void mouseClicked(MouseEvent arg0){
    if(arg0.getSource().equals(table)){
        int row = table.rowAtPoint(table.getMousePosition());
        System.out.println("row: " + row + " clicked.");
        JTextField textField = textFields.get(row);
        if(arg0.getButton() == MouseEvent.BUTTON3 && textField != null){
            textField.setEditable(true);
            System.out.println("row: " + row + " set editable. Caret should now be visible in cell.");
        }
    }

}


@Override
public void mouseEntered(MouseEvent arg0) {
    // Empty method.
}


@Override
public void mouseExited(MouseEvent arg0) {
    // Empty method.
}


@Override
public void mousePressed(MouseEvent arg0) {
    // Empty method.
}


@Override
public void mouseReleased(MouseEvent arg0) {
    // Empty method.
    }

    public static void main(String[] args){
        new EditableJTextFieldInJTable();
    }

}

Answer 1

所以经过坚持，我似乎找到了答案。首先，我必须让表格知道我要编辑单元格，然后请求 TextField 获得焦点。

@Override
public void mouseClicked(MouseEvent arg0){
    if(arg0.getSource().equals(table)){
        int row = table.rowAtPoint(table.getMousePosition());
        System.out.println("row: " + row + " clicked.");
        final JTextField textField = textFields.get(row);
        if(arg0.getButton() == MouseEvent.BUTTON3 && textField != null){
            textField.setEditable(true);
            table.editCellAt(row, 0);
            textField.requestFocus(); // 'textField' is the object within the cell.
            textField.setCaretPosition(textField.getText().length());
            System.out.println("row: " + row + " set editable. Caret should now be visible in cell.");
        }
    }   
}