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The Java Library
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from Component, such as Applet, can generate events For example, you can receive key and mouse events from an applet (You may also build your own components that generate events) In this chapter, we will be handling only mouse and keyboard events, but the following two chapters will be handling events from the sources shown in Table 22-2
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Event Listener Interfaces
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As explained, the delegation event model has two parts: sources and listeners Listeners are created by implementing one or more of the interfaces defined by the javaawtevent package When an event occurs, the event source invokes the appropriate method defined by the listener and provides an event object as its argument Table 22-3 lists commonly used listener interfaces and provides a brief description of the methods that they define The following sections examine the specific methods that are contained in each interface
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The ActionListener Interface
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This interface defines the actionPerformed( ) method that is invoked when an action event occurs Its general form is shown here: void actionPerformed(ActionEvent ae)
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Interface ActionListener AdjustmentListener ComponentListener ContainerListener FocusListener ItemListener KeyListener MouseListener MouseMotionListener MouseWheelListener TextListener WindowFocusListener WindowListener
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Description Defines one method to receive action events Defines one method to receive adjustment events Defines four methods to recognize when a component is hidden, moved, resized, or shown Defines two methods to recognize when a component is added to or removed from a container Defines two methods to recognize when a component gains or loses keyboard focus Defines one method to recognize when the state of an item changes Defines three methods to recognize when a key is pressed, released, or typed Defines five methods to recognize when the mouse is clicked, enters a component, exits a component, is pressed, or is released Defines two methods to recognize when the mouse is dragged or moved Defines one method to recognize when the mouse wheel is moved Defines one method to recognize when a text value changes Defines two methods to recognize when a window gains or loses input focus Defines seven methods to recognize when a window is activated, closed, deactivated, deiconified, iconified, opened, or quit
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TABLE 22-3
Commonly Used Event Listener Interfaces
22:
Event Handling
The AdjustmentListener Interface
This interface defines the adjustmentValueChanged( ) method that is invoked when an adjustment event occurs Its general form is shown here: void adjustmentValueChanged(AdjustmentEvent ae)
The ComponentListener Interface
This interface defines four methods that are invoked when a component is resized, moved, shown, or hidden Their general forms are shown here: void componentResized(ComponentEvent ce) void componentMoved(ComponentEvent ce) void componentShown(ComponentEvent ce) void componentHidden(ComponentEvent ce)
The ContainerListener Interface
This interface contains two methods When a component is added to a container, componentAdded( ) is invoked When a component is removed from a container, componentRemoved( ) is invoked Their general forms are shown here: void componentAdded(ContainerEvent ce) void componentRemoved(ContainerEvent ce)
The FocusListener Interface
This interface defines two methods When a component obtains keyboard focus, focusGained( ) is invoked When a component loses keyboard focus, focusLost( ) is called Their general forms are shown here: void focusGained(FocusEvent fe) void focusLost(FocusEvent fe)
The ItemListener Interface
This interface defines the itemStateChanged( ) method that is invoked when the state of an item changes Its general form is shown here: void itemStateChanged(ItemEvent ie)
The KeyListener Interface
This interface defines three methods The keyPressed( ) and keyReleased( ) methods are invoked when a key is pressed and released, respectively The keyTyped( ) method is invoked when a character has been entered For example, if a user presses and releases the A key, three events are generated in sequence: key pressed, typed, and released If a user presses and releases the HOME key, two key events are generated in sequence: key pressed and released
Part II:
The Java Library
The general forms of these methods are shown here: void keyPressed(KeyEvent ke) void keyReleased(KeyEvent ke) void keyTyped(KeyEvent ke)
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