我想让我的可编辑 JTables 中的编辑器在开始编辑时选择单元格中的所有文本。我已经尝试了一些事情，这些事情都围绕着在从 TableCellEditor.getTableCellEditorComponent 方法返回的组件上调用 JTextComponent.selectAll() 展开。我尝试过的所有方法均无效。

在我最近的尝试中，我更改了 Swing 教程中的 SimpleTableDemo 类，以使用调用 selectAll 方法的自定义 TableCellEditor。在调试器中，我可以看到正在调用 selectAll() 方法，但表格仍然进入编辑模式，而没有选择单元格中的文本(或者可能在显示之前清除了选择)。该代码如下。谁能告诉我哪里出错了？

import javax.swing.DefaultCellEditor;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
import javax.swing.text.JTextComponent;


import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;


public class SimpleTableDemo extends JPanel {
    private boolean DEBUG = false;


    public SimpleTableDemo() {
        super(new GridLayout(1, 0));

        String[] columnNames = {"First Name",
                                "Last Name",
                                "Sport",
                                "# of Years",
                                "Vegetarian"};

        Object[][] data = {
                {"Kathy", "Smith", "Snowboarding", new Integer(5), new Boolean(false)},
                {"John", "Doe", "Rowing", new Integer(3), new Boolean(true)},
                {"Sue", "Black", "Knitting", new Integer(2), new Boolean(false)},
                {"Jane", "White", "Speed reading", new Integer(20), new Boolean(true)},
                {"Joe", "Brown", "Pool", new Integer(10), new Boolean(false)}
        };

        final JTable table = new SelectingTable(data, columnNames);
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        table.setFillsViewportHeight(true);

        if (DEBUG) {
            table.addMouseListener(new MouseAdapter() {
                public void mouseClicked(MouseEvent e) {
                    printDebugData(table);
                }
            });
        }

        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);

        //Add the scroll pane to this panel.
        add(scrollPane);
    }

    private void printDebugData(JTable table) {
        int numRows = table.getRowCount();
        int numCols = table.getColumnCount();
        javax.swing.table.TableModel model = table.getModel();

        System.out.println("Value of data: ");
        for (int i = 0; i < numRows; i++) {
            System.out.print("    row " + i + ":");
            for (int j = 0; j < numCols; j++) {
                System.out.print("  " + model.getValueAt(i, j));
            }
            System.out.println();
        }
        System.out.println("--------------------------");
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("SimpleTableDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        SimpleTableDemo newContentPane = new SimpleTableDemo();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }


    class SelectingTable extends JTable {
        public SelectingTable(Object[][] data, String[] columnNames) {
            super(data, columnNames);
            TableColumnModel model = super.getColumnModel();
            for (int i = 0; i < super.getColumnCount(); i++) {
                TableColumn tc = model.getColumn(i);
                tc.setCellEditor(new SelectingEditor(new JTextField()));
            }
        }

        class SelectingEditor extends DefaultCellEditor {

            public SelectingEditor(JTextField textField) {
                super(textField);
            }

            public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
                Component c = super.getTableCellEditorComponent(table, value, isSelected, row, column);
                if (c instanceof JTextComponent) {
                    JTextComponent jtc = (JTextComponent) c;
                    jtc.requestFocus();
                    jtc.selectAll();
                }
                return c;
            }
        }
    }
}

最佳答案

Table Select All Editor应该为你工作。它是首选解决方案，因此您不必继续创建自定义编辑器。也就是说，包含整数的列应该只接受整数。使用您当前的代码

您的代码确实可以部分工作。如果您使用 F2 键开始编辑，则会选择文本。但是，当您使用鼠标并双击单元格时，第二个鼠标事件将传递给编辑器，因此插入符号可以定位在您单击的位置，这会删除选择。一个解决方案是:

final JTextComponent jtc = (JTextComponent)c;
jtc.requestFocus();
//jtc.selectAll();
SwingUtilities.invokeLater(new Runnable()
{
    public void run()
    {
        jtc.selectAll();
    }
});

关于java - 如何在编辑时选择JTable单元格中的所有文本，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/4611363/