1 import java.awt.*;
2
3 public class TestButton {
4 private Frame f;
5 private Button b;
6
7 public TestButton() {
8 f = new Frame("Test");
9 b = new Button("Press Me!");
10 b.setActionCommand("ButtonPressed");
11 }
12
13 public void launchFrame() {
14 b.addActionListener(new ButtonHandler());
15 f.add(b,BorderLayout.CENTER);
16 f.pack();
17 f.setVisible(true);
18 }
19
20 public static void main(String args[]) {
21 TestButton guiApp = new TestButton();
22 guiApp.launchFrame();
23 }
24 }
1 import java.awt.event.*;
2
3 public class ButtonHandler implements ActionListener {
4 public void actionPerformed(ActionEvent e) {
5 System.out.println("Action occurred");
6 System.out.println("Button's command is: "
7 + e.getActionCommand());
8 }
9 }
| Notikumu kategorija | Interfeiss | Metodes |
| Darbība (ar pogu utml.) | ActionListener | actionPerformed(ActionEvent) |
| Izvēle (piemēram, sarakstā) | ItemListener | itemStateChanged(ItemEvent) |
| Peles darbības | MouseListener | mousePressed(MouseEvent) mouseReleased(MouseEvent) mouseEntered(MouseEvent) mouseExited(MouseEvent) mouseClicked(MouseEvent) |
| Peles trajektorija | MouseMotionListener | mouseDragged(MouseEvent) mouseMoved(MouseEvent) |
| Tastatūra | KeyListener | keyPressed(KeyEvent) keyReleased(KeyEvent) keyTyped(KeyEvent) |
| Fokuss | FocusListener | focusGained(FocusEvent) focusLost(FocusEvent) |
| Korekcija | AdjustmentListener | adjustmentValueChanged (AdjustmentEvent) |
| Komponents | ComponentListener | componentMoved(ComponentEvent) componentHidden (ComponentEvent) componentResized(ComponentEvent) componentShown(ComponentEvent) |
| Logs | WindowListener | windowClosing(WindowEvent) windowOpened(WindowEvent) windowIconified(WindowEvent) windowDeiconified(WindowEvent) windowClosed(WindowEvent) windowActivated(WindowEvent) windowDeactivated(WindowEvent) |
| Konteiners | ContainerListener | componentAdded(ContainerEvent) componentRemoved(ContainerEvent) |
| Teksts | TextListener | textValueChanged(TextEvent) |
1 import java.awt.*;
2 import java.awt.event.*;
3
4 public class TwoListener
5 implements MouseMotionListener,
6 MouseListener {
7 private Frame f;
8 private TextField tf;
9
10 public TwoListener() {
11 f = new Frame("Two listeners example");
12 tf = new TextField(30);
13 }
14
15 public void launchFrame() {
16 Label label = new Label("Click and drag the mouse");
17 // Pievieno komponentus logam
18 f.add(label, BorderLayout.NORTH);
19 f.add(tf, BorderLayout.SOUTH);
20 // Pievieno "this" objektu kā klausītāju
21 f.addMouseMotionListener(this);
22 f.addMouseListener(this);
23 // Uzstāda loga izmēru un padara to redzamu
24 f.setSize(300, 200);
25 f.setVisible(true);
26 }
27
28 // Šie ir MouseMotionListener notikumi
29 public void mouseDragged(MouseEvent e) {
30 String s = "Peles vilkshana: X = " + e.getX()
31 + " Y = " + e.getY();
32 tf.setText(s);
33 }
34
35 public void mouseEntered(MouseEvent e) {
36 String s = "Pele ienaaca";
37 tf.setText(s);
38 }
39
40 public void mouseExited(MouseEvent e) {
41 String s = "Pele izgāja";
42 tf.setText(s);
43 }
44
45 // Neizmantota MouseMotionListener metode
46 // Visām klausītāja metodēm jābūt definētām
47 // klasē, pat ja tās nelieto
48 public void mouseMoved(MouseEvent e) { }
49
50 // Neizmantotas MouseListener metodes
51 public void mousePressed(MouseEvent e) { }
52 public void mouseClicked(MouseEvent e) { }
53 public void mouseReleased(MouseEvent e) { }
54
55 public static void main(String args[]) {
56 TwoListener two = new TwoListener();
57 two.launchFrame();
58 }
59 }
Piemērs:
1 import java.awt.*;
2 import java.awt.event.*;
3
4 public class MouseClickHandler extends MouseAdapter {
5
6 // Mums vajag tikai mouseClicked() apstrādātāju,
7 // un mantošana no adaptera ļauj nerakstīt
8 // visas citas apstrādes metodes
9
10 public void mouseClicked(MouseEvent e) {
11 // Apstrādā peles klikšķi
12 }
13 }
1 import java.awt.*;
2 import java.awt.event.*;
3
4 public class TestInner {
5 private Frame f;
6 private TextField tf;
7
8 public TestInner() {
9 f = new Frame("Ieksheejas klases piemeers");
10 tf = new TextField(30);
11 }
12
13 public void launchFrame() {
14 Label label = new Label("Klikshkjiniet un 'velciet' peli");
15 // Pievieno komponentus logam
16 f.add(label, BorderLayout.NORTH);
17 f.add(tf, BorderLayout.SOUTH);
18 // Pievieno klausītāju, kurš lieto iekšēju klasi
19 f.addMouseMotionListener(new MyMouseMotionListener());
20 f.addMouseListener(new MouseClickHandler());
21 // Uzstaada loga izmeeru un padara to redzamu
22 f.setSize(300, 200);
23 f.setVisible(true);
24 }
25
26 class MyMouseMotionListener extends MouseMotionAdapter {
27 public void mouseDragged(MouseEvent e) {
28 String s = "Peles vilkshana: X = "+ e.getX()
29 + " Y = " + e.getY();
30 tf.setText(s);
31 }
32 }
33
34 public static void main(String args[]) {
35 TestInner obj = new TestInner();
36 obj.launchFrame();
37 }
38 }
1 import java.awt.*;
2 import java.awt.event.*;
3
4 public class TestAnonymous {
5 private Frame f;
6 private TextField tf;
7
8 public TestAnonymous() {
9 f = new Frame("Anoniimas klases piemeers");
10 tf = new TextField(30);
11 }
12
13 public void launchFrame() {
14 Label label = new Label("Klikshkjiniet un 'velciet' peli");
15 // Pievieno logam komponentus
16 f.add(label, BorderLayout.NORTH);
17 f.add(tf, BorderLayout.SOUTH);
18 // Pievieno klausītāju, kurš ir anonīmā klasē
19 f.addMouseMotionListener(new MouseMotionAdapter() {
20 public void mouseDragged(MouseEvent e) {
21 String s = "Peles vilkšana: X = "+ e.getX()
22 + " Y = " + e.getY();
23 tf.setText(s);
24 }
25 }); // <- ievērojiet šo iekavu secību!
26 f.addMouseListener(new MouseClickHandler());
27 // Uzstāda loga izmēru un padara to redzamu
28 f.setSize(300, 200);
29 f.setVisible(true);
30 }
31
32 public static void main(String args[]) {
33 TestAnonymous obj = new TestAnonymous();
34 obj.launchFrame();
35 }
36 }
Diskusiju tēma: Kādi, bez AWT pakotnē aprakstītajiem, vēl mēdz būt noderīgi GUI komponenti un to ģenerēto notikumu veidi.