Serializable
ContainerEvent
, FocusEvent
, InputEvent
, PaintEvent
, WindowEvent
public class ComponentEvent extends AWTEvent
Component events are provided for notification purposes ONLY; The AWT will automatically handle component moves and resizes internally so that GUI layout works properly regardless of whether a program is receiving these events or not.
In addition to serving as the base class for other component-related events (InputEvent, FocusEvent, WindowEvent, ContainerEvent), this class defines the events that indicate changes in a component's size, position, or visibility.
This low-level event is generated by a component object (such as a List) when the component is moved, resized, rendered invisible, or made visible again. The event is passed to every ComponentListener
or ComponentAdapter
object which registered to receive such events using the component's addComponentListener
method. (ComponentAdapter
objects implement the ComponentListener
interface.) Each such listener object gets this ComponentEvent
when the event occurs.
An unspecified behavior will be caused if the id
parameter of any particular ComponentEvent
instance is not in the range from COMPONENT_FIRST
to COMPONENT_LAST
.
Modifier and Type | Field | Description |
---|---|---|
static final int |
COMPONENT_FIRST |
The first number in the range of ids used for component events. |
static final int |
COMPONENT_HIDDEN |
This event indicates that the component was rendered invisible. |
static final int |
COMPONENT_LAST |
The last number in the range of ids used for component events. |
static final int |
COMPONENT_MOVED |
This event indicates that the component's position changed. |
static final int |
COMPONENT_RESIZED |
This event indicates that the component's size changed. |
static final int |
COMPONENT_SHOWN |
This event indicates that the component was made visible. |
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 |
---|---|
ComponentEvent |
Constructs a ComponentEvent object. |
Modifier and Type | Method | Description |
---|---|---|
Component |
getComponent() |
Returns the originator of the event. |
String |
paramString() |
Returns a parameter string identifying this event. |
getSource
public static final int COMPONENT_FIRST
public static final int COMPONENT_LAST
@Native public static final int COMPONENT_MOVED
@Native public static final int COMPONENT_RESIZED
@Native public static final int COMPONENT_SHOWN
@Native public static final int COMPONENT_HIDDEN
public ComponentEvent(Component source, int id)
ComponentEvent
object. This method throws an IllegalArgumentException
if source
is null
.
source
- The Component
that originated the eventid
- An integer indicating the type of event. For information on allowable values, see the class description for ComponentEvent
IllegalArgumentException
- if source
is nullpublic Component getComponent()
Component
object that originated the event, or null
if the object is not a Component
.public String paramString()
paramString
in class AWTEvent
© 1993, 2023, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/java/awt/event/ComponentEvent.html