我有一个带有键监听器的JList,使用户可以轻松地从列表中删除一个项目.在
Windows上,它工作正常.您点击删除键,该项目被删除.在mac上,程序不响应删除键.我正在使用KeyEvent.VK_DELETE,我认为这是一种检测特殊键的平台中立方式.有没有不同的方法我应该在Mac上检测按键？
studentJList.setModel(studentListModel); // a custom model I wrote
studentJList.addKeyListener(new KeyListener() {
@Override
public void keypressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_DELETE) {
studentListModel.remove(studentJList.getSelectedindex());
studentJList.revalidate();
}
}
@Override
public void keyreleased(KeyEvent e) { }
@Override
public void keyTyped(KeyEvent e) { }
});
例如
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ListDemo extends JPanel {
private static final long serialVersionUID = 1L;
private JFrame frame = new JFrame("ListDemo");
private JList list;
private DefaultListModel listModel;
public ListDemo() {
super(new BorderLayout());
listModel = new DefaultListModel();
listModel.addElement("Jane Doe");
listModel.addElement("John Smith");
listModel.addElement("Kathy Green");
list = new JList(listModel);
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
list.setSelectedindex(0);
list.setVisibleRowCount(5);
JScrollPane listScrollPane = new JScrollPane(list);
frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
frame.add(listScrollPane,BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
setKeyBindings();
}
private void setKeyBindings() {
list.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT)
.put(Keystroke.getKeystroke("DELETE"),"clickDelete");
list.getActionMap().put("clickDelete",new AbstractAction() {
private static final long serialVersionUID = 1L;
@Override
public void actionPerformed(ActionEvent e) {
int index = list.getSelectedindex();
if (index > -1) {
listModel.remove(index);
}
}
});
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokelater(new Runnable() {
public void run() {
ListDemo listDemo = new ListDemo();
}
});
}
}