java 第9章 AWT图形用户界面设计.ppt

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ContainerEvent 容器中增加删除了组件 ContainerListener componentAdded(containerEvent) componentRemoved(containerEvent) * TextEvent 文本字段或文本区发生改变 TextListener textValueChanged(TextEvent) * import java.awt.*; import java.awt.event.*; import javax.swing.*; public class TwoListener implements MouseMotionListener,MouseListener,WindowListener { private JFrame f; private JTextField tf; public static void main(String args[]) { TwoListener two = new TwoListener(); two.go(); } * public void go() { f = new JFrame(Two listeners example); f.getContentPane().add(new JLabel(Click and drag the mouse),North); tf = new JTextField(30); f.getContentPane().add(tf,South); f.addMouseMotionListener(this); f.addMouseListener(this); f.addWindowListener(this); f.setSize(300,200); f.setVisible(true); } * public void mouseDragged (MouseEvent e) { String s = Mouse dragging : X=+e.getX()+Y = +e.getY(); tf.setText(s); } public void mouseMoved(MouseEvent e){} public void mouseClicked(MouseEvent e){} public void mouseEntered(MouseEvent e){ String s = The mouse entered; tf.setText(s); } * public void mouseExited(MouseEvent e){ String s = The mouse has left the building; tf.setText(s); } public void mousePressed(MouseEvent e){} public void mouseReleased(MouseEvent e){ } public void windowClosing(WindowEvent e) { System.exit(1); } * public void windowOpened(WindowEvent e) { } public void windowIconified(WindowEvent e) { } public void windowDeiconified(WindowEvent e) { } public void windowClosed(WindowEvent e) { } public void windowActivated(WindowEvent e) { } public void windowDeactivated(WindowEvent e) { } } * 可以声明多个接口 ……implements MouseMotionListener, MouseListener,WindowListener 可以同时监听一个事件源上发生的多种事件： f.addMouseMotionListener(this); f.addMouseListener(this); f.addWindowListener(this); 可以通过事件对象获得详细资料 public void mouseDragged(MouseEvent e) { String s