Java ListSelection侦听器未触发事件
有人知道为什么吗Java ListSelection侦听器未触发事件,java,swing,Java,Swing,有人知道为什么吗 System.out.println(e.getFirstIndex()); System.out.println(e.getLastIndex()); 两者都不做什么?我的侦听器是否未正确注册?我试图知道某个单元格何时被选中,并对其进行处理。类似于通过鼠标或按键选择该单元格时为其设置默认文本 package VLGui; import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.
System.out.println(e.getFirstIndex()); System.out.println(e.getLastIndex()); 两者都不做什么?我的侦听器是否未正确注册?我试图知道某个单元格何时被选中,并对其进行处理。类似于通过鼠标或按键选择该单元格时为其设置默认文本
package VLGui;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DateFormat;
import java.util.*;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.Timer;
import javax.swing.table.*;
import VLCore.cellSelectedListener;
public class mainFrame extends JFrame{
private JLabel lblTime;
private Vector columnName = new Vector();
private Vector tblData = new Vector();
private JTable JTbl;
private Timer timer = new Timer(1000,new MyListener());
private JPanel topPnl,cenPnl,btmPnl;
private Calendar time;
private Object[] columnNames = {"Veh No.","Description","Time In","Time Out"};
public mainFrame()
{
timer.start();
//jtable settings
JTbl = new JTable(new DefaultTableModel(columnNames,1));
JTbl.setPreferredScrollableViewportSize(JTbl.getPreferredSize());
JTbl.setFillsViewportHeight(true);
JTbl.setCellSelectionEnabled(false);
JTbl.setColumnSelectionInterval(0,0);
JTbl.setRowSelectionInterval(0,0);
JTbl.getSelectionModel().addListSelectionListener(new cellSelectedListener(JTbl));
//Settings
setDefaultCloseOperation(EXIT_ON_CLOSE);
setTitle("Vehicle Log");
setSize(500,1000);
setVisible(true);
//Dec
JScrollPane tableContainer = new JScrollPane(JTbl);
topPnl = new JPanel();
cenPnl = new JPanel();
btmPnl = new JPanel();
lblTime = new JLabel();
//Adding Components
topPnl.add(lblTime,BorderLayout.CENTER);
cenPnl.add(tableContainer);
getContentPane().add(topPnl,BorderLayout.NORTH);
getContentPane().add(cenPnl,BorderLayout.CENTER);
//add(btmPnl);
}
public class MyListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
time = Calendar.getInstance();
lblTime.setText(time.getTime().toString());
lblTime.repaint();
}
}
}
package VLCore;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class cellSelectedListener implements ListSelectionListener {
private JTable jTbl;
public cellSelectedListener()
{
}
public cellSelectedListener(JTable tbl)
{
jTbl = tbl;
}
@Override
public void valueChanged(ListSelectionEvent e) {
ListSelectionModel lsm = (ListSelectionModel)e.getSource();
System.out.println(e.getFirstIndex());
System.out.println(e.getLastIndex());
}
}
问题是,该行已被选中 表选择模型与行的选择更改相关 如果您更改注册侦听器的顺序,如下所示
JTbl.getSelectionModel().addListSelectionListener(new cellSelectedListener(JTbl));
JTbl.setColumnSelectionInterval(0, 0);
JTbl.setRowSelectionInterval(0, 0);
您将看到行选择的更改
更新代码审查…
通常,这JTbl.setPreferredScrollableViewportSize(JTbl.getPreferredSize())代码>不是一个好主意。你真的想让滚动窗格来做这些决定。如果确实想影响表的宽度,可以更改列大小
Java命名约定建议所有实例变量都以小写字符开头,所以JTbl
将变成JTbl
,所有类都以大写字母开头,所以mainFrame
将变成mainFrame
…很小的事情,但这是人们真正习惯的。。删除了我的答案以避免混淆。@Melnocholson进行了一些挖掘和WTF?;)是的。我发现的问题不是问题的核心。