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JavaTM 2 Platform Std. Ed. v1.3 |
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SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object | +--java.util.EventObject | +--java.awt.AWTEvent | +--java.awt.event.ComponentEvent
A low-level event which indicates that a component moved, changed size, or changed visibility (also, the root class for the other component-level events).
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.
ComponentAdapter
,
ComponentListener
,
Tutorial: Writing a Component Listener,
Reference: The Java Class Libraries (update file), Serialized FormField Summary | |
static int |
COMPONENT_FIRST
The first number in the range of ids used for component events. |
static int |
COMPONENT_HIDDEN
This event indicates that the component was rendered invisible. |
static int |
COMPONENT_LAST
The last number in the range of ids used for component events. |
static int |
COMPONENT_MOVED
This event indicates that the component's position changed. |
static int |
COMPONENT_RESIZED
This event indicates that the component's size changed. |
static int |
COMPONENT_SHOWN
This event indicates that the component was made visible. |
Fields inherited from class java.util.EventObject |
source |
Constructor Summary | |
ComponentEvent(Component source,
int id)
Constructs a ComponentEvent object. |
Method Summary | |
Component |
getComponent()
Returns the originator of the event. |
String |
paramString()
Returns a parameter string identifying this event. |
Methods inherited from class java.awt.AWTEvent |
consume, finalize, getID, isConsumed, toString |
Methods inherited from class java.util.EventObject |
getSource |
Methods inherited from class java.lang.Object |
clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
public static final int COMPONENT_FIRST
public static final int COMPONENT_LAST
public static final int COMPONENT_MOVED
public static final int COMPONENT_RESIZED
public static final int COMPONENT_SHOWN
public static final int COMPONENT_HIDDEN
Constructor Detail |
public ComponentEvent(Component source, int id)
source
- the Component object that originated the eventid
- an integer indicating the type of eventMethod Detail |
public Component getComponent()
public String paramString()
paramString
in class AWTEvent
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JavaTM 2 Platform Std. Ed. v1.3 |
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