如何将listener事件添加到DefaultListModel对象添加的JList元素中?
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21-12-2019 - |
题
我已经创建了2个JLists'addGroupList'和'addApkList'。我正在使用model向addGroupList添加元素。addElement(arrayList1.get(arrayList1.尺寸()-1));事情是,我想根据addGroupList的选定值更新addApkList。为此,我试图添加事件侦听器,以便在选择列表项但事件不是trigerring时可以对某些内容采取行动。我该怎么做才能做到这一点?以下是我正在使用的代码。
model1 = new DefaultListModel();
model2 = new DefaultListModel();
addApkList = new JList(model1);
addGroupList = new JList(model2);
scrollPane1 = new JScrollPane();
scrollPane1.setViewportView(addApkList);
scrollPane2 = new JScrollPane();
scrollPane2.setViewportView(addGroupList);
这样我就定义了JList。通过以下方式,我向addGroupList添加了元素
model1.addElement(arrayList1.get(arrayList1.size()-1));
通过以下方式,我添加了listener。
addGroupList.addListSelectionListener(new ListSelectionListener() {
@Override
public void valueChanged(ListSelectionEvent lse) {
if (!lse.getValueIsAdjusting()) {
System.out.println("Selection trigerred");
}
}
});
这个代码似乎没有发生任何变化。我做错了什么?我也试过以下
model1.addListDataListener(new ListDataListener() {
@Override
public void intervalAdded(ListDataEvent lde) {
System.out.println("ddddddddddd");
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public void intervalRemoved(ListDataEvent lde) {
System.out.println("ddddddddddd");
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public void contentsChanged(ListDataEvent lde) {
System.out.println("ddddddddddd");
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
});
解决方案
通过以下方式,我向addGroupList添加了元素
model1.addElement(arrayList1.get(arrayList1.size()-1));
不,你没有。 model1
列表模型是 addApkList
不是 addGroupList
:
addApkList = new JList(model1);
应该是 model2.addElement(arrayList1.get(arrayList1.size()-1))
.
无论如何,我怀疑你在等一个 列表选择 当你只是简单地将一个项目添加到列表模型时被解雇。那不会发生的。您需要将添加的项目设置为选定的项目:
Object item = arrayList1.get(arrayList1.size()-1);
model2.addElement(item);
addGroupList.setSelectedValue(item, true);
看看 JList。setSelectedValue(对象anObject,boolean shouldScroll) 有关详情。
其他提示
我已经创建了2个Jlists'Addgrouplist'和'addapklist'。我在加入 与Addgrouplist的元素使用 model.addelement(arraylist1.get(arraylist1.size() - 1));事情是,我 想要根据Addgrouplist的选定值更新Addapklist。为了 这,我正在尝试添加活动侦听器,以便我可以采取行动 选择列表项时的东西,但事件不是Trigering。 我该怎么做才能完成这一点?以下是我正在使用的代码。
例如
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class Testing extends JFrame {
private static final long serialVersionUID = 1L;
private DefaultListModel listModel = new DefaultListModel();
private DefaultListModel listModelEmpty = new DefaultListModel();
private JList list = new JList(listModel);
private JList listEmpty = new JList(listModelEmpty);
private JPanel panel = new JPanel(new GridLayout(1, 1));
private int currentSelectedRow = 0;
private int xX = 0;
public Testing() {
setLocation(400, 300);
setDefaultCloseOperation(EXIT_ON_CLOSE);
for (int x = 0; x < 9; x++) {
listModel.addElement("" + x);
xX++;
}
JScrollPane sp = new JScrollPane(list);
list.addListSelectionListener(new ListSelectionListener() {
@Override
public void valueChanged(ListSelectionEvent lse) {
if (!lse.getValueIsAdjusting()) {
System.out.println("Selection trigerred");
}
}
});
JScrollPane spEmpty = new JScrollPane(listEmpty);
panel.add(spEmpty);
panel.add(sp);
add(panel, BorderLayout.CENTER);
JButton btn1 = new JButton("Reset Model CastingModel");
add(btn1, BorderLayout.NORTH);
btn1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
//list.clearSelection();
DefaultListModel model = (DefaultListModel) list.getModel();
model.removeAllElements();
for (int x = 0; x < 9; x++) {
model.addElement("" + (x + xX));
xX++;
}
list.setModel(model);
}
});
JButton btn2 = new JButton("Reset Model directly from Model");
add(btn2, BorderLayout.SOUTH);
btn2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
//list.clearSelection();
listModel.removeAllElements();
for (int x = 0; x < 9; x++) {
listModel.addElement("" + (x + xX));
xX++;
}
}
});
pack();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Testing().setVisible(true);
}
});
}
}
.