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public class: ComponentEvent [javadoc | source]

All Implemented Interfaces:

Direct Known Subclasses:
    MenuDragMouseEvent, ContainerEvent, WindowEvent, PaintEvent, FocusEvent, MouseWheelEvent, MenuKeyEvent, MouseEvent, InputEvent, KeyEvent

A low-level event which indicates that a component moved, changed size, or changed visibility (also, the root class for the other component-level events).

Component events are provided for notification purposes ONLY; The AWT will automatically handle component moves and resizes internally so that GUI layout works properly regardless of whether a program is receiving these events or not.

In addition to serving as the base class for other component-related events (InputEvent, FocusEvent, WindowEvent, ContainerEvent), this class defines the events that indicate changes in a component's size, position, or visibility.

This low-level event is generated by a component object (such as a List) when the component is moved, resized, rendered invisible, or made visible again. The event is passed to every ComponentListener or ComponentAdapter object which registered to receive such events using the component's addComponentListener method. (ComponentAdapter objects implement the ComponentListener interface.) Each such listener object gets this ComponentEvent when the event occurs.

An unspecified behavior will be caused if the {@code id} parameter of any particular {@code ComponentEvent} instance is not in the range from {@code COMPONENT_FIRST} to {@code COMPONENT_LAST}.

Field Summary
public static final  int COMPONENT_FIRST    The first number in the range of ids used for component events. 
public static final  int COMPONENT_LAST    The last number in the range of ids used for component events. 
public static final  int COMPONENT_MOVED    This event indicates that the component's position changed. 
public static final  int COMPONENT_RESIZED    This event indicates that the component's size changed. 
public static final  int COMPONENT_SHOWN    This event indicates that the component was made visible. 
public static final  int COMPONENT_HIDDEN    This event indicates that the component was rendered invisible. 
Fields inherited from java.awt.AWTEvent:
Fields inherited from java.util.EventObject:
 public ComponentEvent(Component source,
    int id) 
    Constructs a ComponentEvent object.

    This method throws an IllegalArgumentException if source is null.

    source - The Component that originated the event
    id - An integer indicating the type of event. For information on allowable values, see the class description for ComponentEvent
    IllegalArgumentException - if source is null
    Also see:
Method from java.awt.event.ComponentEvent Summary:
getComponent,   paramString
Methods from java.awt.AWTEvent:
consume,   convertToOld,   copyPrivateDataInto,   dispatched,   getAccessControlContext,   getID,   isConsumed,   paramString,   setSource,   toString
Methods from java.util.EventObject:
getSource,   toString
Methods from java.lang.Object:
clone,   equals,   finalize,   getClass,   hashCode,   notify,   notifyAll,   toString,   wait,   wait,   wait
Method from java.awt.event.ComponentEvent Detail:
 public Component getComponent() 
    Returns the originator of the event.
 public String paramString() 
    Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.