Serializable
public class ContainerEvent extends ComponentEvent
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 id
parameter of any particular ContainerEvent
instance is not in the range from CONTAINER_FIRST
to CONTAINER_LAST
.
Modifier and Type | Field | Description |
---|---|---|
static final int |
COMPONENT_ADDED |
This event indicates that a component was added to the container. |
static final int |
COMPONENT_REMOVED |
This event indicates that a component was removed from the container. |
static final int |
CONTAINER_FIRST |
The first number in the range of ids used for container events. |
static final int |
CONTAINER_LAST |
The last number in the range of ids used for container events. |
COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN
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
source
Constructor | Description |
---|---|
ContainerEvent |
Constructs a ContainerEvent object. |
Modifier and Type | Method | 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. |
getComponent
getSource
public static final int CONTAINER_FIRST
public static final int CONTAINER_LAST
public static final int COMPONENT_ADDED
public static final int COMPONENT_REMOVED
public ContainerEvent(Component source, int id, Component child)
ContainerEvent
object. This method throws an IllegalArgumentException
if source
is null
.
source
- The Component
object (container) that originated the eventid
- 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 removedIllegalArgumentException
- if source
is nullpublic Container getContainer()
Container
object that originated the event, or null
if the object is not a Container
.public Component getChild()
public String paramString()
paramString
in class ComponentEvent
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/java/awt/event/ContainerEvent.html