如何在编辑时选择JTable单元格中的所有文本

简介这篇文章主要介绍了如何在编辑时选择JTable单元格中的所有文本以及相关的经验技巧，文章约6721字，浏览量194，点赞数7，值得推荐！

我想让我的可编辑JTable中的编辑器在开始编辑时选择单元格中的所有文本。我尝试了一些事情，都围绕从TableCellEditor.getTableCellEditorComponent方法返回的组件上调用JTextComponent.selectAll（）。我尝试过的所有事情都没有。

在我最近的尝试中，我改变了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，但是表仍然进入编辑模式而不选择单元格中的文本（或者可能在显示之前清除选择）。该代码如下。谁能告诉我哪里出错了？

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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;
            }
        }
    }
}

Table Select All Editor应该适合你。它是首选解决方案，因此您无需继续创建自定义编辑器。这是包含整数的列应该只接受整数。随你当前的代码

您的代码部分工作。如果使用F2键开始编辑，则选择文本。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，以便将插入符号放置在您单击的位置，这将删除选择。解决方案是：

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

public class SelectAllCellEditor extends DefaultCellEditor
{
    public SelectAllCellEditor(final JTextField textField ) {
        super( textField );
        textField.addFocusListener( new FocusAdapter()
        {
            public void focusGained( final FocusEvent e )
            {
                textField.selectAll();
            }
        } );
    }
}

　JTable可以在单元中具有许多不同的组件。编辑时通常是JTextField。您需要首先获取该字段然后选择。您可以通过处理模式来获取文本的长度。此代码应该让您入门，您可能希望将其放在List选择处理程序中。即。

ListSelectionModel rowSM = this.getSelectionModel();
rowSM.addListSelectionListener(new ListSelectionListener() {
   public void valueChanged(ListSelectionEvent e){
      DefaultCellEditor ed = (DefaultCellEditor)this.getCellEditor();
      JTextField jf = (JTextField)ed.getComponent();
      jf.select(0, *text.length()*);
      jf.requestFocusInWindow();
   }
});