[英]How to change JTable cell text while editing?
我试图达到的效果是:每次用户开始在表中编辑单元格时,我希望该单元格的文本擦除最初存在的所有文本(“开始编辑”部分),并且如果没有新文本添加,以将文本设置为原始文本(“停止编辑”)
在我看来,我以为setValueAt会更改当前正在编辑的单元格中的文本是错误的-相反,它似乎只会在编辑完成后才更改单元格的值(这意味着我可能不会完全不需要我放在“停止编辑”下的代码)
但是,如果确实如此,我不知道如何在当前正在编辑的单元格中编辑文本,所以这是我的问题:如何更改当前正在编辑的单元格中的文本?
例如,将其设置为使得当我开始编辑“测试bb”时,该单元格更改为没有文本:
这是我的代码:
private void tblEntriesPropertyChange(java.beans.PropertyChangeEvent evt) {
swb.tablePropertyChange(tblEntries, evt);
}
public void tablePropertyChange(JTable jtable, PropertyChangeEvent evt) {
TableModel mdl = jtable.getModel();
int c = jtable.getSelectedColumn();
int r = jtable.getSelectedRow();
if (r >= 0 && c >= 0) {
String text = mdl.getValueAt(r, c) + "";
if (evt.getNewValue() == null) {
System.out.println("Stop Editing");
String newText = mdl.getValueAt(r, c) + "";
if (newText.length() <= 0) {
jtable.setValueAt(text, r, c); // also tried: mdl.setValueAt(text, r, c);
}
} else {
System.out.println("Start Editing");
jtable.setValueAt("", r, c); // also tried: mdl.setValueAt("", r, c);
}
}
}
尝试“干预”这种过程可能是一个真正的技巧。 您有两个基本选择。 您可以创建一个自定义JTable
实现,并确保将诸如null
的内容传递给激活的任何编辑器,从而将您锁定为只能使用一次的JTable
,也可以提供自己的编辑器。
public class CleanCellEditor extends DefaultCellEditor {
public static CleanCellEditor make() {
JTextField field = new JTextField();
field.setBorder(null);
System.out.println("make");
return new CleanCellEditor(field);
}
public CleanCellEditor(JTextField textField) {
super(textField);
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
return super.getTableCellEditorComponent(table, null, isSelected, row, column);
}
}
尽管这稍微好一点,但实际上您可以将其应用于JTable
任何实现,但这确实意味着您需要为表可能需要支持的所有可能的值/类型创建一个
作为一个基本的例子...
import java.awt.Component;
import java.awt.EventQueue;
import java.util.Vector;
import javax.swing.AbstractCellEditor;
import javax.swing.DefaultCellEditor;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
DefaultTableModel model = new DefaultTableModel(new Object[]{"A", "B", "C", "D"}, 0);
for (int row = 0; row < 10; row++) {
Vector data = new Vector(model.getColumnCount());
for (int col = 0; col < model.getColumnCount(); col++) {
data.add(row + "x" + col);
}
model.addRow(data);
}
JTable table = new JTable(model);
table.setDefaultEditor(Object.class, CleanCellEditor.make());
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public static class CleanCellEditor extends DefaultCellEditor {
public static CleanCellEditor make() {
JTextField field = new JTextField();
field.setBorder(null);
System.out.println("make");
return new CleanCellEditor(field);
}
public CleanCellEditor(JTextField textField) {
super(textField);
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
return super.getTableCellEditorComponent(table, null, isSelected, row, column);
}
}
}
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