ContainerEvent (Java 2 Platform SE 5.0) (original) (raw)

java.awt.event

Class ContainerEvent

java.lang.Object extended by java.util.EventObject java.awt.AWTEvent java.awt.event.ComponentEvent java.awt.event.ContainerEvent

All Implemented Interfaces:

Serializable

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.

Since:

1.1

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, HIERARCHY_BOUNDS_EVENT_MASK, HIERARCHY_EVENT_MASK, id, INPUT_METHOD_EVENT_MASK, INVOCATION_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, MOUSE_WHEEL_EVENT_MASK, PAINT_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK, WINDOW_FOCUS_EVENT_MASK, WINDOW_STATE_EVENT_MASK

Fields inherited from class java.awt.AWTEvent

ACTION_EVENT_MASK, ADJUSTMENT_EVENT_MASK, COMPONENT_EVENT_MASK, consumed, CONTAINER_EVENT_MASK, FOCUS_EVENT_MASK, HIERARCHY_BOUNDS_EVENT_MASK, HIERARCHY_EVENT_MASK, id, INPUT_METHOD_EVENT_MASK, INVOCATION_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, MOUSE_WHEEL_EVENT_MASK, PAINT_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK, WINDOW_FOCUS_EVENT_MASK, WINDOW_STATE_EVENT_MASK

Fields inherited from class java.util.EventObject
source

Constructor Summary
[ContainerEvent](../../../java/awt/event/ContainerEvent.html#ContainerEvent%28java.awt.Component, int, java.awt.Component%29)(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

Methods inherited from class java.awt.AWTEvent
consume, getID, isConsumed, setSource, toString

Methods inherited from class java.util.EventObject
getSource

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, [wait](../../../java/lang/Object.html#wait%28long, int%29)

Field Detail

CONTAINER_FIRST

public static final int CONTAINER_FIRST

The first number in the range of ids used for container events.

See Also:

Constant Field Values

CONTAINER_LAST

public static final int CONTAINER_LAST

The last number in the range of ids used for container events.

See Also:

Constant Field Values

COMPONENT_ADDED

public static final int COMPONENT_ADDED

This event indicates that a component was added to the container.

See Also:

Constant Field Values

COMPONENT_REMOVED

public static final int COMPONENT_REMOVED

This event indicates that a component was removed from the container.

See Also:

Constant Field Values

Constructor Detail

ContainerEvent

public ContainerEvent(Component source, int id, Component child)

Constructs a ContainerEvent object.

Note that passing in an invalid id results in unspecified behavior. This method throws anIllegalArgumentException if source is null.

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

Throws:

[IllegalArgumentException](../../../java/lang/IllegalArgumentException.html "class in java.lang") - if source is null

Method Detail

getContainer

public Container getContainer()

Returns the originator of the event.

Returns:

the Container object that originated the event, or null if the object is not a Container.

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.

Overrides:

[paramString](../../../java/awt/event/ComponentEvent.html#paramString%28%29) in class [ComponentEvent](../../../java/awt/event/ComponentEvent.html "class in java.awt.event")

Returns:

a string identifying the event and its attributes

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.