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Class java.awt.event.ContainerEvent

java.lang.Object
    |
    +----java.util.EventObject
            |
            +----java.awt.AWTEvent
                    |
                    +----java.awt.event.ComponentEvent
                            |
                            +----java.awt.event.ContainerEvent

public class ContainerEvent
extends ComponentEvent
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, ContainerListener, Tutorial: Writing a Container Listener, Reference: The Java Class Libraries (update file)

Field Summary
static int  COMPONENT_ADDED
This event indicates that a component was added to the container.
static int  COMPONENT_REMOVED
This event indicates that a component was removed from the container.
static int  CONTAINER_FIRST
The first number in the range of ids used for container events.
static int  CONTAINER_LAST
The last number in the range of ids used for container events.
 
Fields inherited from class java.awt.event.ComponentEvent
 COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN
 
Fields inherited from class java.awt.AWTEvent
 ACTION_EVENT_MASK, ADJUSTMENT_EVENT_MASK, COMPONENT_EVENT_MASK, consumed, CONTAINER_EVENT_MASK, FOCUS_EVENT_MASK, id, INPUT_METHOD_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK
 
Fields inherited from class java.util.EventObject
 source
 

Constructor Summary
 ContainerEvent(Component source, int id, Component child)
Constructs a ContainerEvent object.
 

Method Summary
Component  getChild()
Returns the component that was affected by the event.
Container  getContainer()
Returns the originator of the event.
String  paramString()
Returns a parameter string identifying this event.
 
Methods inherited from class java.awt.event.ComponentEvent
 getComponent, paramString
 
Methods inherited from class java.awt.AWTEvent
 consume, getID, isConsumed, paramString, toString
 
Methods inherited from class java.util.EventObject
 getSource, toString
 
Methods inherited from class java.lang.Object
 clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

CONTAINER_FIRST

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

CONTAINER_LAST

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

COMPONENT_ADDED

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

COMPONENT_REMOVED

public static final int COMPONENT_REMOVED
This event indicates that a component was removed from the container.
Constructor Detail

ContainerEvent

public ContainerEvent(Component source,
                      int id,
                      Component child)
Constructs a ContainerEvent object.
Parameters:
source - the Component object (container) that originated the event
id - an integer indicating the type of event
child - the component that was added or removed
Method Detail

getContainer

public Container getContainer()
Returns the originator of the event.
Returns:
the Container object that originated the event

getChild

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

paramString

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

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