GUI--事件处理

**一.事件处理模型**

事件源（组件），事件（Event）,监听器（Listener）,事件处理。

1.确定事件源

2.通过事件源对象的addXXXListener()方法将监听器注册到该事件源上，该方法接收XXXListener的子类对象，一般用匿名内部类来表示。

3.在覆盖方法时，方法的参数一般是XXXEvent类型的变量接收。

4.事件触发后会把事件打包成对象传递给该变量。

**二.事件及其相应的监听器接口**

常用事件对应的监听器接口和接口中的方法

事件类别	意义及支持事件的组件	接口名	方法
ActionEvent	激活组件 JButton,JList,JTextFeild,JMenuItem, Component派生类	ActionListener	actionPerformed(ActionEvent)
ItemEvent	选择了某些项目 JCheckBox,JComboBox,JList等	ItemListener	itemStateChanged(ItemEvent)
MouseEvent	鼠标移动 Component派生类	MouseMotionListener	mouseDragged(MouseEvent) mouseMoved(MouseEvent)
MouseEvent	鼠标单击等 Component派生类	MouseListener	mousePressed(MouseEvent) mouseReleased(MouseEvent) mouseEntered(MouseEvent) mouseExited(MouseEvent) mouseClicked(MouseEvent)
KeyEvent	键盘输入 Component派生类	KeyListener	keyPressed(KeyEvent) keyReleased(KeyEvent) keyTyped(KeyEvent)
FocusEvent	组件收到或失去焦点 Component派生类	FocusListener	focusGained(FocusEvent) focusLost(FocusEvent)
AdjustmentEvent	移动了滚动条等组件 实现Adjustable接口的类	AdjustmentListener	adjustmentValueChanged(AdjustmentEvent)
ComponentEvent	对象移动，缩放，显示隐藏等 Component派生类	ComponentListener	componentMoved(ComponentEvent) componentHidden(ComponentEvent) componentResized(ComponentEvent) componentShown(ComponentEvent)
WindowEvent	窗口收到窗口级事件 Window及其派生类	WindowListener	windosClosing(WindowEvent) windosOpened(WindowEvent) windosIconified(WindowEvent) windosDeiconified(WindowEvent) windosClosed(WindowEvent) windosActivated(WindowEvent) windosDeactivated(WindowEvent)
ContainerEvent	容器中增加，删除了组件 Component派生类	ContainerListener	componentAdded(ContainerEvent) componentRemoved(ContainerEvent)
TextEvent	文本字段或文本区发生改变 TextFeild,TextArea等	TextListener	textVakueChanged(TextEvent)