23Java GUI程序设计(3).ppt

1、Java GUI程序设计(3),目标,理解事件处理机制 掌握常见事件类型与监听器接口 掌握如何写一个监听器类 掌握注册监听器 掌握事件适配器,委派式事件处理模型,Swing事件模型,事件源对象,事件对象,监听器对象,处理事件,Swing中的GUI组件,发生事件,传递,事件源对象如何知道通知哪个监听器?,在事件源对象上注册监听器 add( listener),事件处理示例,public class HelloFrame extends JFrame JPanel contentPane; BorderLayout borderLayout1 = new BorderLayout(); JButt

2、on jButton1 = new JButton(); JTextField jTextField1 = new JTextField(); public HelloFrame() contentPane = (JPanel) getContentPane(); contentPane.setLayout(borderLayout1); setSize(new Dimension(400, 300); setTitle(Frame Title); jButton1.setText(press me); jButton1.addActionListener(new Frame1_jButton

3、1_actionAdapter(this); contentPane.add(jButton1); setVisible(true); ,/监听器类 class Frame1_jButton1_actionAdapter implements ActionListener private Frame1 adaptee; Frame1_jButton1_actionAdapter(Frame1 adaptee) this.adaptee = adaptee; public void actionPerformed(ActionEvent e) adaptee.jTextField1.setTex

4、t(“you press the button); ,窗口事件,当一个窗口被激活、撤销激活、打开、关闭、最大化、最小化时，发生窗口事件。 从WindowEvent类中创建的对象表示窗口事件。,示例,public class FrameW extends JFrame implements WindowListener public FrameW() this.addWindowListener(this); public void windowClosed(WindowEvent e) public void windowOpened(WindowEvent e) public void wi

5、ndowClosing(WindowEvent e) System.exit(1); public void windowIconified(WindowEvent e) public void windowDeiconified(WindowEvent e) public void windowActivated(WindowEvent e) public void windowDeactivated(WindowEvent e) public static void main(String args) FrameW framew = new FrameW(); framew.setSize

6、(300,200); framew.setVisible(true); ,鼠标事件,当鼠标被点击、按下、抬起、拖动、移动时产生鼠标事件 MouseEvent类的对象表示鼠标事件 处理鼠标事件的类要实现以下接口： MouseListener MouseMotionListener,跟踪多个事件示例,public class TwoListener implements MouseMotionListener, MouseListener private JFrame fr; private JTextField tf; TwoListener() fr=new JFrame(TwoListene

7、r Example); fr.getContentPane().setLayout(new FlowLayout(); fr.getContentPane().add(new JLabel(click and drag the mouse); tf=new JTextField(30); fr.getContentPane().add(tf); fr.addMouseListener(this); fr.addMouseMotionListener(this); fr.setSize(300,200); fr.setVisible(true); public static void main(

8、String args) TwoListener twolistener = new TwoListener(); ,public void mouseDragged(MouseEvent e) String s=Mouse dragging:X=+e.getX()+Y=+e.getY(); tf.setText(s); public void mouseMoved(MouseEvent e) String s=Mouse moved:X=+e.getX()+Y=+e.getY(); tf.setText(s); public void mouseClicked(MouseEvent e) S

9、tring s=Mouse clicked:X=+e.getX()+Y=+e.getY(); tf.setText(s); public void mouseEntered(MouseEvent e) String s=The mouse entered; tf.setText(s); public void mouseExited(MouseEvent e) public void mousePressed(MouseEvent e) public void mouseReleased(MouseEvent e) ,事件 MyFrame_this_windowAdapter(MyFrame adapte