问来自ListSelectionListener接口的valueChanged方法中的问题
EN

Stack Overflow用户

提问于 2010-10-03 21:34:41

回答 1查看 1.1K关注 0票数 1

我已经创建了一个包含三个JList列表的JDialog。选择第一个列表(名为FirstList)中的行会更新第二个列表(SecondList)的内容，选择第二个列表中的行会更新第三个列表(ThirdList)的内容。在ThirdList类中，我包含了以下方法：

public void addRowsSelected(int format_row, int pathway_row){
    first_list_selected_row = fl_row;
    second_list_selected_row = sl_row;

    ListSelectionModel listSelectionModel = this.getSelectionModel();
    listSelectionModel.addListSelectionListener(new ThirdListSelectionListener(dialog, first_list_selected_row, second_list_selected_row)); 
}

然后，我创建了ThirdListSelectionListener类，如下所示：

package eu.keep.gui.mainwindow.menubar.renderfile;

import java.io.IOException;
import java.util.List;
import java.util.ListIterator;

import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

import eu.keep.characteriser.registry.Pathway;

public class ThirdListSelectionListener implements ListSelectionListener{

private ContentGenerated content;
public EmulatorList emulator_list;
private int first_list_selected_row; 
private int second_list_selected_row;
private FirstList first_list;
private SecondList second_list;
private ThirdList third_list;

public ThirdListSelectionListener(MyDialog dialog, int first_list_selected_row, int second_list_selected_row){

    this.content = dialog.content;
    this.first_list_selected_row = first_list_selected_row;
    this.second_list_selected_row = second_list_selected_row;

    this.first_list = dialog.firstList;
    this.second_list = dialog.secondList;
    this.third_list = dialog.thirdList;

    System.out.println("1. The first list row selected is "+this.first_list_selected_row);
    System.out.println("2. The second list row selected is "+this.second_list_selected_row);

}

public void valueChanged(ListSelectionEvent e){

    if (e.getValueIsAdjusting())
          return;

    Object source = e.getSource();
    ListSelectionModel list = (ListSelectionModel)e.getSource();

    if (list.isSelectionEmpty()) {

    }else{

                //int selected_row = list.getMinSelectionIndex();

                try {

          System.out.println("first: "+first_list_selected_row);
      System.out.println("second: "+second_list_selected_row);
      //System.out.println("third: "+selected_row);

                    // DO SOMETHING HERE

                } catch (IOException e1) {

                }

            }

    }

}

现在问题来了:例如，如果我首先从第一个列表中选择第二行，从第二个列表中选择第二行，从第三个列表中选择第二行，我将如预期的那样得到以下消息：

1. The first list row selected is 2
2. The second list row selected is 2
first: 2
second: 2
third: 2

但是，如果在我从第二个列表中选择第一行之后不久，再次从第三个列表中选择第二行，我会得到以下输出：

1. The first list row selected is 2
2. The second list row selected is 1
first: 2
second: 2
third: 2

我没有使用"second: 1“，而是一直使用"second: 2”。我相信second_list_selected_row会在ThirdListSelectionListener构造函数中更新，但在valueChanged方法中不会更改。有人能告诉我这个问题的原因和解决方法吗？提前感谢！！

java

swing

jlist

云联络中心6.1折起

灵活稳定的一体化云联络中心，助力快速搭建集电话、在线交流、音视频通话为一体的客户联络平台

回答 1

Stack Overflow用户

回答已采纳

发布于 2010-10-04 02:07:32

您在其ctor中分配了ThirdListSelectionListener的first_list_selected_row和second_list_selected_row，并且从未更改过它们(至少在您发布的代码中没有更改)。您可以使用first_list.getSelectedIndex()和second_list.getSelectedIndex()获取当前选定的行。