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public class: ContainerEvent [javadoc | source]

All Implemented Interfaces:

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.

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

Field Summary
public static final  int CONTAINER_FIRST    The first number in the range of ids used for container events. 
public static final  int CONTAINER_LAST    The last number in the range of ids used for container events. 
public static final  int COMPONENT_ADDED    This event indicates that a component was added to the container. 
public static final  int COMPONENT_REMOVED    This event indicates that a component was removed from the container. 
 Component child    The non-null component that is being added or removed from the Container. 
Fields inherited from java.awt.event.ComponentEvent:
Fields inherited from java.awt.AWTEvent:
Fields inherited from java.util.EventObject:
 public ContainerEvent(Component source,
    int id,
    Component child) 
    Constructs a ContainerEvent object.

    This method throws an IllegalArgumentException if source is null.

    source - The Component object (container) that originated the event
    id - An integer indicating the type of event. For information on allowable values, see the class description for ContainerEvent
    child - the component that was added or removed
    IllegalArgumentException - if source is null
    Also see:
Method from java.awt.event.ContainerEvent Summary:
getChild,   getContainer,   paramString
Methods from java.awt.event.ComponentEvent:
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.ContainerEvent Detail:
 public Component getChild() 
    Returns the component that was affected by the event.
 public Container getContainer() 
    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.