public class java.awt.event
ComponentEvent


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Java SE 6
  
Extends: EventObject > AWTEvent
Extended by: ContainerEvent, FocusEvent, InputEvent, PaintEvent, WindowEvent
Details
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.
version1.29 04/13/06
since1.1
See also java.awt.event.ComponentAdapter, java.awt.event.ComponentListener, (UNLABELED)


Fields
final public static int COMPONENT_FIRST
The first number in the range of ids used for component events.
final public static int COMPONENT_LAST
The last number in the range of ids used for component events.
final public static int COMPONENT_MOVED
This event indicates that the component's position changed.
final public static int COMPONENT_RESIZED
This event indicates that the component's size changed.
final public static int COMPONENT_SHOWN
This event indicates that the component was made visible.
final public static int COMPONENT_HIDDEN
This event indicates that the component was rendered invisible.

Constructors
public ComponentEvent(Component source, int id) Details
Constructs a ComponentEvent object.

Note that passing in an invalid id results in unspecified behavior. This method throws an IllegalArgumentException if source is null.
sourcethe Component that originated the event
idan integer indicating the type of event
ThrowsIllegalArgumentException: if source is null


Methods
public String paramString() Details
Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.
returna string identifying the event and its attributes

Properties
public Component getComponent() Details
Returns the originator of the event.
returnthe Component object that originated the event, or null if the object is not a Component.
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Java SE 6
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