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？
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();
}
});
值得注意的是，您需要找到text.length（）。可能是这样的东西：
this.getModel().getValueAt(this.getSelectedRow(), this.getSelectedColumn()).length();
免责声明我没有测试过这段代码。