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Chapter 19 java.awt Reference |
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Chapter 19 java.awt Reference |
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![[Graphic: Figure from the text]](./figs/awteve3.gif)
This class multicasts events to event listeners. Each multicaster has two listeners, cunningly named a and b. When an event source calls one of the listener methods of the multicaster, the multicaster calls the same listener method on both a and b. Multicasters are built into trees using the static add() and remove() methods. In this way a single event can be sent to many listeners.
Static methods make it easy to implement event multicasting in component subclasses. Each time an add<type>Listener() function is called in the component subclass, call the corresponding AWTEventMulticaster.add() method to chain together (or "tree up") listeners. Similarly, when a remove<type>Listener() function is called, AWTEventMulticaster.remove() can be called to remove a chained listener.
public class java.awt.AWTEventMulticaster
extends java.lang.Object
implements java.awt.event.ActionListener, java.awt.event.AdjustmentListener,
java.awt.event.ComponentListener, java.awt.event.ContainerListener,
java.awt.event.FocusListener, java.awt.event.ItemListener,
java.awt.event.KeyListener, java.awt.event.MouseListener,
java.awt.event.MouseMotionListener, java.awt.event.TextListener,
java.awt.event.WindowListener {
// Variables
protected EventListener a;
protected EventListener b;
// Constructors
protected AWTEventMulticaster(EventListener a, EventListener b);
// Class Methods
public static ActionListener add(ActionListener a, ActionListener b);
public static AdjustmentListener add(AdjustmentListener a,
AdjustmentListener b);
public static ComponentListener add(ComponentListener a,
ComponentListener b);
public static ContainerListener add(ContainerListener a,
ContainerListener b);
public static FocusListener add(FocusListener a, FocusListener b);
public static ItemListener add(ItemListener a, ItemListener b);
public static KeyListener add(KeyListener a, KeyListener b);
public static MouseListener add(MouseListener a, MouseListener b);
public static MouseMotionListener add(MouseMotionListener a,
MouseMotionListener b);
public static TextListener add(TextListener a, TextListener b);
public static WindowListener add(WindowListener a, WindowListener b);
protected static EventListener addInternal(EventListener a, EventListener b);
public static ActionListener remove(ActionListener l, ActionListener oldl);
public static AdjustmentListener remove(AdjustmentListener l,
AdjustmentListener oldl);
public static ComponentListener remove(ComponentListener l,
ComponentListener oldl);
public static ContainerListener remove(ContainerListener l,
ContainerListener oldl);
public static FocusListener remove(FocusListener l, FocusListener oldl);
public static ItemListener remove(ItemListener l, ItemListener oldl);
public static KeyListener remove(KeyListener l, KeyListener oldl);
public static MouseListener remove(MouseListener l, MouseListener oldl);
public static MouseMotionListener remove(MouseMotionListener l,
MouseMotionListener oldl);
public static TextListener remove(TextListener l, TextListener oldl);
public static WindowListener remove(WindowListener l, WindowListener;
protected static EventListener removeInternal(EventListener l,
EventListener oldl);
// Instance Methods
public void actionPerformed(ActionEvent e);
public void adjustmentValueChanged(AdjustmentEvent e);
public void componentAdded(ContainerEvent e);
public void componentHidden(ComponentEvent e);
public void componentMoved(ComponentEvent e);
public void componentRemoved(ContainerEvent e);
public void componentResized(ComponentEvent e);
public void componentShown(ComponentEvent e);
public void focusGained(FocusEvent e);
public void focusLost(FocusEvent e);
public void itemStateChanged(ItemEvent e);
public void keyPressed(KeyEvent e);
public void keyReleased(KeyEvent e);
public void keyTyped(KeyEvent e);
public void mouseClicked(MouseEvent e);
public void mouseDragged(MouseEvent e);
public void mouseEntered(MouseEvent e);
public void mouseExited(MouseEvent e);
public void mouseMoved(MouseEvent e);
public void mousePressed(MouseEvent e);
public void mouseReleased(MouseEvent e);
public void textValueChanged(TextEvent e);
public void windowActivated(WindowEvent e);
public void windowClosed(WindowEvent e);
public void windowClosing(WindowEvent e);
public void windowDeactivated(WindowEvent e);
public void windowDeiconified(WindowEvent e);
public void windowIconified(WindowEvent e);
public void windowOpened(WindowEvent e);
// Protected Instance Methods
protected EventListener remove(EventListener oldl);
protected void saveInternal(ObjectOutputStream s, String k) throws IOException;
}
One of the EventListeners this AWTEventMulticaster sends events to.
One of the EventListeners this AWTEventMulticaster sends events to.
A listener that receives events.
A listener that receives events.
Constructs an AWTEventMulticaster that sends events it receives to the supplied listeners. The constructor is protected because it is only the class methods of AWTEventMulticaster that ever instantiate this class.
An event listener.
An event listener.
A listener object that passes events to a and b.
An event listener.
An event listener.
A listener object that passes events to a and b.
An event listener.
An event listener.
A listener object that passes events to a and b.
An event listener.
An event listener.
A listener object that passes events to a and b.
An event listener.
An event listener.
A listener object that passes events to a and b.
An event listener.
An event listener.
A listener object that passes events to a and b.
An event listener.
An event listener.
A listener object that passes events to a and b.
An event listener.
An event listener.
A listener object that passes events to a and b.
An event listener.
An event listener.
A listener object that passes events to a and b.
An event listener.
An event listener.
A listener object that passes events to a and b.
An event listener.
An event listener.
A listener object that passes events to a and b.
An event listener.
An event listener.
A listener object that passes events to a and b.
This method is a helper for the add() methods.
An event listener.
An event listener.
A listener object that multicasts to l but not oldl.
An event listener.
An event listener.
A listener object that multicasts to l but not oldl.
An event listener.
An event listener.
A listener object that multicasts to l but not oldl.
An event listener.
An event listener.
A listener object that multicasts to l but not oldl.
An event listener.
An event listener.
A listener object that multicasts to l but not oldl.
An event listener.
An event listener.
A listener object that multicasts to l but not oldl.
An event listener.
An event listener.
A listener object that multicasts to l but not oldl.
An event listener.
An event listener.
A listener object that multicasts to l but not oldl.
An event listener.
An event listener.
A listener object that multicasts to l but not oldl.
An event listener.
An event listener.
A listener object that multicasts to l but not oldl.
An event listener.
An event listener.
A listener object that multicasts to l but not oldl.
An event listener.
An event listener.
A listener object that multicasts to l but not oldl.
An event listener.
An event listener.
A listener object that multicasts to l but not oldl.
This method is a helper for the remove() methods.
The action event that occurred.
Handles the event by passing it on to listeners a and b.
The adjustment event that occurred.
Handles the event by passing it on to listeners a and b.
The container event that occurred.
Handles the event by passing it on to listeners a and b.
The component event that occurred.
Handles the event by passing it on to listeners a and b.
The component event that occurred.
Handles the event by passing it on to listeners a and b.
The container event that occurred.
Handles the event by passing it on to listeners a and b.
The component event that occurred.
Handles the event by passing it on to listeners a and b.
The component event that occurred.
Handles the event by passing it on to listeners a and b.
The focus event that occurred.
Handles the event by passing it on to listeners a and b.
The focus event that occurred.
Handles the event by passing it on to listeners a and b.
The item event that occurred.
Handles the event by passing it on to listeners a and b.
The key event that occurred.
Handles the event by passing it on to listeners a and b.
The key event that occurred.
Handles the event by passing it on to listeners a and b.
The key event that occurred.
Handles the event by passing it on to listeners a and b.
The mouse event that occurred.
Handles the event by passing it on to listeners a and b.
The mouse event that occurred.
Handles the event by passing it on to listeners a and b.
The mouse event that occurred.
Handles the event by passing it on to listeners a and b.
The mouse event that occurred.
Handles the event by passing it on to listeners a and b.
The mouse event that occurred.
Handles the event by passing it on to listeners a and b.
The mouse event that occurred.
Handles the event by passing it on to listeners a and b.
The mouse event that occurred.
Handles the event by passing it on to listeners a and b.
The text event that occurred.
Handles the event by passing it on to listeners a and b.
The window event that occurred.
Handles the event by passing it on to listeners a and b.
The window event that occurred.
Handles the event by passing it on to listeners a and b.
The window event that occurred.
Handles the event by passing it on to listeners a and b.
The window event that occurred.
Handles the event by passing it on to listeners a and b.
The window event that occurred.
Handles the event by passing it on to listeners a and b.
The window event that occurred.
Handles the event by passing it on to listeners a and b.
The window event that occurred.
Handles the event by passing it on to listeners a and b.
The listener to remove.
The resulting EventListener.
This method removes oldl from the AWTEventMulticaster and returns the resulting listener.
ActionEvent, AdjustmentEvent, ComponentEvent, Event, EventListener, EventObject, FocusEvent, ItemEvent, KeyEvent, MouseEvent, WindowEvent
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| AWTEvent |
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AWTException |
