- java.lang.Object
-
- 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
orContainerAdapter
object which registered to receive such events using the component'saddContainerListener
method. (ContainerAdapter
objects implement theContainerListener
interface.) Each such listener object gets thisContainerEvent
when the event occurs.An unspecified behavior will be caused if the
id
parameter of any particularContainerEvent
instance is not in the range fromCONTAINER_FIRST
toCONTAINER_LAST
.- Since:
- 1.1
- See Also:
ContainerAdapter
,ContainerListener
, Tutorial: Writing a Container Listener, Serialized Form
-
-
Field Summary
Fields Modifier and Type Field and Description 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.util.EventObject
source
-
-
Constructor Summary
Constructors Constructor and Description ContainerEvent(Component source, int id, Component child)
Constructs aContainerEvent
object.
-
Method Summary
Methods Modifier and Type Method and Description 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
-
-
-
-
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 aContainerEvent
object.This method throws an
IllegalArgumentException
ifsource
isnull
.- Parameters:
source
- TheComponent
object (container) that originated the eventid
- An integer indicating the type of event. For information on allowable values, see the class description forContainerEvent
child
- the component that was added or removed- Throws:
IllegalArgumentException
- ifsource
is null- See Also:
getContainer()
,AWTEvent.getID()
,getChild()
-
-
Method Detail
-
getContainer
public Container getContainer()
Returns the originator of the event.- Returns:
- the
Container
object that originated the event, ornull
if the object is not aContainer
.
-
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
in classComponentEvent
- Returns:
- a string identifying the event and its attributes
-
-
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