单击 rows/columns 时，ListSelectionEvent 会异步触发 2 个触发器

Question

ListSelectionEvent 在单击时异步触发 2 个触发器 rows/columns

我应该更改我的代码吗？

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class JTableListSelectionListener {

public static void main(String[] a) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final JTable table;

String[] columnTitles = { "A", "B", "C", "D" };
Object[][] rowData = { { "11", "12", "13", "14" }, { "21", "22", "23", "24" },
    { "31", "32", "33", "34" }, { "41", "42", "44", "44" } };

table = new JTable(rowData, columnTitles);

table.setCellSelectionEnabled(true);
ListSelectionModel cellSelectionModel = table.getSelectionModel();
cellSelectionModel.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

cellSelectionModel.addListSelectionListener(new ListSelectionListener() {
  public void valueChanged(ListSelectionEvent e) {
    String selectedData = null;

    int[] selectedRow = table.getSelectedRows();
    int[] selectedColumns = table.getSelectedColumns();

    for (int i = 0; i < selectedRow.length; i++) {
      for (int j = 0; j < selectedColumns.length; j++) {
        selectedData = (String) table.getValueAt(selectedRow[i], selectedColumns[j]);
      }
    }
    System.out.println("Selected: " + selectedData);
  }

});

frame.add(new JScrollPane(table));

frame.setSize(300, 200);
frame.setVisible(true);
}

}

输出将是

已选择：42

已选择：33

但是我想在用户单击特定行或列时触发单个事件？

Answer 1

使用 ListSelectionEvent.getValueIsAdjusting() 检查它是否（正在更改）。

Returns whether or not this is one in a series of multiple events, where changes are still being made. See the documentation for ListSelectionModel.setValueIsAdjusting(boolean) for more details on how this is used.

Answer 2

按照 Andrew Thompson 的建议添加了 getValueIsAdjusting() 并且更新后的代码将是

cellSelectionModel.addListSelectionListener(new ListSelectionListener() {
  public void valueChanged(ListSelectionEvent e) {

    if(e.getValueIsAdjusting()) {
        return;
    }
    ..

单击 rows/columns 时，ListSelectionEvent 会异步触发 2 个触发器

ListSelectionEvent fire 2 triggers asynchronously when clicking rows/columns

java

swing

jtable

event-handling

listselectionlistener