Swing自定义事件

1.Swing自定义事件-将一个组件的事件传递给另一个组件.

使用EventListenerList来管理事件,当A组件触发事件的时候,调用方法fireActionPerformed()来触发事件,然后再B组件中 actionPerformed()方法来接收事件.

当在容器KeyTextComponent中按下鼠标,我们就可以在Jframe中捕获触发的事件.

1import java.awt.event.ActionEvent;
2import java.awt.event.ActionListener;
3import java.awt.event.KeyAdapter;
4import java.awt.event.KeyEvent;
5import java.awt.event.KeyListener;
6import java.awt.event.MouseAdapter;
7import java.awt.event.MouseEvent;
8import java.awt.event.MouseListener;
9import java.util.EventListener;
10
11import javax.swing.JComponent;
12import javax.swing.JFrame;
13import javax.swing.JTextField;
14import javax.swing.event.EventListenerList;
15
16class KeyTextComponent extends JComponent {
17  private EventListenerList actionListenerList = new EventListenerList();
18
19  public KeyTextComponent() {
20    KeyListener internalKeyListener = new KeyAdapter() {
21      public void keyPressed(KeyEvent keyEvent) {
22        System.out.println("keyPressed");
23        if (actionListenerList != null) {
24          int keyCode = keyEvent.getKeyCode();
25          String keyText = KeyEvent.getKeyText(keyCode);
26          ActionEvent actionEvent = new ActionEvent(this, ActionEvent.ACTION_PERFORMED, keyText);
27          fireActionPerformed(actionEvent);//触发事件
28        }
29      }
30    };
31    MouseListener internalMouseListener = new MouseAdapter() {
32      public void mousePressed(MouseEvent mouseEvent) {
33        requestFocusInWindow();
34      }
35    };
36
37    addKeyListener(internalKeyListener);
38    addMouseListener(internalMouseListener);
39  }
40
41  public void addActionListener(ActionListener actionListener) {//事件管理
42    actionListenerList.add(ActionListener.class, actionListener);
43  }
44
45  public void removeActionListener(ActionListener actionListener) {
46    actionListenerList.remove(ActionListener.class, actionListener);
47  }
48
49  protected void fireActionPerformed(ActionEvent actionEvent) {//触发事件
50    EventListener listenerList[] = actionListenerList.getListeners(ActionListener.class);
51    for (int i = 0, n = listenerList.length; i < n; i++) {
52      ((ActionListener) listenerList[i]).actionPerformed(actionEvent);
53    }
54  }
55
56  public boolean isFocusable() {
57    return true;
58  }
59}
60
61public class KeyTextComponentDemo {
62  public static void main(String[] args) {
63    JFrame aWindow = new JFrame();
64    aWindow.setBounds(30, 30, 300, 300); // Size
65    aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
66
67    KeyTextComponent com = new KeyTextComponent();
68    aWindow.add(com, "Center");
69    com.addActionListener(new ActionListener() {
70
71      public void actionPerformed(ActionEvent e) {
72        System.out.println("action");//获取事件
73
74      }
75
76    });
77
78    aWindow.add(new JTextField(), "South");
79
80    aWindow.setVisible(true); // Display the window
81  }
82}