我想要达到的效果是:每当用户开始编辑表格中的单元格时,我希望单元格的文本可以删除原来的任何文本('开始编辑'部分),如果没有添加新文本,只需将文本设置为原始文本('停止编辑')
在我看来,我认为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更改单元格的值(这意味着我可能不会需要我放在'停止编辑之后的代码
但是,如果确实如此,我不知道如何编辑当前正在编辑的单元格中的文本,所以这是我的问题:如何更改文本中的文本当前正在编辑的单元格?
例如,制作它以便在我开始编辑'测试bb时,'单元格变为没有文字:
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);
}
}
}
答案 0 :(得分:3)
试图&#34;介入&#34;在这种过程中可能是一个真正的伎俩。你有两个基本选择。您可以创建自定义JTable
实现,并确保将null
之类的内容传递给任何编辑器变为活动状态,这会将您锁定为单次使用JTable
,或者您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);
}
}
虽然这稍微好一点,但是你可以将它应用于JTable
的任何实现,但它确实意味着您需要为表可能需要支持的所有可能值/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);
}
}
}