Question

我有一个带有一些字符串值的模型。这个模型，我将它应用于两个jlists。每次我从一个jlist点击一个值时，我都需要这个值从另一个值中消失。然后，如果它发生在另一个jlist上，但首先必须将值更新为模型包含的值。我做了一些努力但是当我点击一个值时我的代码然后它在两个列表上消失了！我究竟做错了什么？这是代码：

 /*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
*/

package accessfiletest;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.*;


/**
 *
* @author 
*/

 @SuppressWarnings("serial")
public class MoveFolders extends JFrame  
{
//start of class MoveFolders 
//start of variables
private DefaultListModel<String> theModel;
private DefaultListModel<String> fromModel;
private DefaultListModel<String> toModel;
private JList<String> fromJList;
private JList<String> toList;
private JButton moveButton;
private JPanel theJPanel;
//end of variables
public MoveFolders( DefaultListModel<String> model1)
{
 super("Μετακίνηση Εγγράφων από Φάκελο σε Φάκελο");
 fromModel=model1;
 toModel=model1;
 theModel=model1;
 theJPanel=new JPanel(null);
 fromJList=new JList<>(fromModel);
 fromJList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
 fromJList.setSelectedIndex(0);
 fromJList.addMouseListener(fromlistener);

JScrollPane frompane=new  JScrollPane(fromJList);
frompane.setBounds(50, 50, 200, 150);
theJPanel.add(frompane);
moveButton=new JButton("ΜΕΤΑΚΙΝΗΣΗ >>");
moveButton.setBounds(260, 90, 150, 20);
theJPanel.add(moveButton);
toList=new JList<>(toModel);
 if (model1.getSize()>1)
   {
    toList.setSelectedIndex(1);

   }
else
   {
    JOptionPane.showMessageDialog(null,
"Πρέπει να έχετε πάνω από 1 φάκελο για να γίνει αντιγραφή εγγράφων.\nΤο παράθυρο θα       κλείσει.", "Λάθος", JOptionPane.ERROR_MESSAGE);
 dispose();
   }
 toList.addMouseListener(toListener);
 toList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
 JScrollPane topane=new  JScrollPane(toList);
 topane.setBounds(420, 50, 200, 150);
 theJPanel.add(topane);

 add(theJPanel);
 setDefaultCloseOperation(DISPOSE_ON_CLOSE);
 setSize(670, 300);
 setVisible(true);
 }

 MouseListener fromlistener = new MouseAdapter() {
 public void mouseClicked(MouseEvent e) {
    if (e.getClickCount() == 1) {
        final int index = fromJList.locationToIndex(e.getPoint());
       SwingUtilities.invokeLater(new Runnable() {

                @Override
                public void run() {
                   toModel=theModel;
                   toModel.remove(index);
                }
            });
        }
   }
};

MouseListener toListener = new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
    if (e.getClickCount() == 1) {
        final int index = fromJList.locationToIndex(e.getPoint());
        SwingUtilities.invokeLater(new Runnable() {

                @Override
                public void run() {
                    fromModel=theModel;
                    fromModel.remove(index);
                }
            });
     }
   }

  };

}//end of class MoveFolders

Answer 1

每个列表都需要使用自己的ListModel，

引用

    public MoveFolders(DefaultListModel<String> model1) {
        ...
        fromModel = new DefaultListModel<>();
        for (Object obj : model1.toArray()) {
            fromModel.addElement((String) obj);
        }
        toModel = new DefaultListModel<>();
        theModel = model1;
        ...
    }

将元素fromModel移动到toModel

    MouseListener fromlistener = new MouseAdapter() {
        public void mouseClicked(MouseEvent e) {
            if (e.getClickCount() == 1) {
                final int index = fromJList.locationToIndex(e.getPoint());
                SwingUtilities.invokeLater(new Runnable() {

                    @Override
                    public void run() {
                        int index = fromJList.getSelectedIndex();
                        toModel.addElement(fromModel.getElementAt(index));
                        fromModel.remove(index);
                    }
                });
            }
        }
    };

将元素toModel移动到fromModel

    MouseListener toListener = new MouseAdapter() {
        public void mouseClicked(MouseEvent e) {
            if (e.getClickCount() == 1) {
                final int index = fromJList.locationToIndex(e.getPoint());
                SwingUtilities.invokeLater(new Runnable() {

                    @Override
                    public void run() {
                        int index = toList.getSelectedIndex();
                        fromModel.addElement(toModel.getElementAt(index));
                        toModel.remove(index);
                    }
                });
            }
        }

    };


}

我希望这可以帮到你

Answer 2

您使用的是同一型号的两倍，但它们实际上是不同的。如果它们本质上不同，请使用不同的模型。如果修改不同视图（JList）使用的模型，它们都反映了底层模型的变化，这是很正常的。

具有相同模型的一对jlists（如何从一个选定的其他模型中删除）

2 个答案: