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Java Source Code / Java Documentation » 6.0 JDK Core » AWT » java.awt.event

Source Cross Reference Class Diagram Java Document (Java Doc)

java.awt.event .ComponentEvent

java.awt.event .ContainerEvent

ContainerEvent

public class ContainerEvent extends ComponentEvent (Code)

A low-level event which indicates that a container's contents changed because a component was added or removed.

Container events are provided for notification purposes ONLY; The AWT will automatically handle changes to the containers contents internally so that the program works properly regardless of whether the program is receiving these events or not.

This low-level event is generated by a container object (such as a Panel) when a component is added to it or removed from it. The event is passed to every ContainerListener or ContainerAdapter object which registered to receive such events using the component's addContainerListener method. (ContainerAdapter objects implement the ContainerListener interface.) Each such listener object gets this ContainerEvent when the event occurs.
See Also:   ContainerAdapter
See Also:   ContainerListener
See Also:    Tutorial: Writing a Container Listener
author:
   Tim Prinzing
author:
   Amy Fowler
version:
   1.28 06/05/07
since:
   1.1

Field Summary
final public static int	COMPONENT_ADDED This event indicates that a component was added to the container.
final public static int	COMPONENT_REMOVED This event indicates that a component was removed from the container.
final public static int	CONTAINER_FIRST The first number in the range of ids used for container events.
final public static int	CONTAINER_LAST The last number in the range of ids used for container events.
Component	child The non-null component that is being added or removed from the Container.

Constructor Summary
public	ContainerEvent(Component source, int id, Component child) Constructs a `ContainerEvent` object. Note that passing in an invalid `id` results in unspecified behavior.

Method Summary
public Component	getChild() Returns the component that was affected by the event.
public Container	getContainer() Returns the originator of the event. the `Container` object that originated the event, or `null` if the object is not a `Container`.
public String	paramString() Returns a parameter string identifying this event.

Field Detail

COMPONENT_ADDED
final public static int COMPONENT_ADDED(Code)
	This event indicates that a component was added to the container.

COMPONENT_REMOVED
final public static int COMPONENT_REMOVED(Code)
	This event indicates that a component was removed from the container.

CONTAINER_FIRST
final public static int CONTAINER_FIRST(Code)
	The first number in the range of ids used for container events.

CONTAINER_LAST
final public static int CONTAINER_LAST(Code)
	The last number in the range of ids used for container events.

child
Component child(Code)
	The non-null component that is being added or removed from the Container. See Also: ContainerEvent.getChild()

Constructor Detail

ContainerEvent
public ContainerEvent(Component source, int id, Component child)(Code)
	Constructs a `ContainerEvent` object. Note that passing in an invalid `id` results in unspecified behavior. This method throws an `IllegalArgumentException` if `source` is `null`. Parameters: source - the `Component` object (container)that originated the event Parameters: id - an integer indicating the type of event Parameters: child - the component that was added or removed throws: IllegalArgumentException - if `source` is null

Method Detail

getChild
public Component getChild()(Code)
	Returns the component that was affected by the event. the Component object that was added or removed

getContainer
public Container getContainer()(Code)
	Returns the originator of the event. the `Container` object that originated the event, or `null` if the object is not a `Container`.

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

Fields inherited from java.awt.event.ComponentEvent

final public static int COMPONENT_FIRST(Code)(Java Doc)
final public static int COMPONENT_HIDDEN(Code)(Java Doc)
final public static int COMPONENT_LAST(Code)(Java Doc)
final public static int COMPONENT_MOVED(Code)(Java Doc)
final public static int COMPONENT_RESIZED(Code)(Java Doc)
final public static int COMPONENT_SHOWN(Code)(Java Doc)

Methods inherited from java.awt.event.ComponentEvent

public Component getComponent()(Code)(Java Doc)
public String paramString()(Code)(Java Doc)

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