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Class java.awt.event.ComponentEvent

java.lang.Object
    |
    +----java.util.EventObject
            |
            +----java.awt.AWTEvent
                    |
                    +----java.awt.event.ComponentEvent
Subclasses:
ContainerEvent, FocusEvent, InputEvent, PaintEvent, WindowEvent

public class ComponentEvent
extends AWTEvent
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.

See Also:
ComponentAdapter, ComponentListener, Tutorial: Writing a Component Listener, Reference: The Java Class Libraries (update file)

Field 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.awt.AWTEvent
 ACTION_EVENT_MASK, ADJUSTMENT_EVENT_MASK, COMPONENT_EVENT_MASK, consumed, CONTAINER_EVENT_MASK, FOCUS_EVENT_MASK, id, INPUT_METHOD_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK
 
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, getID, isConsumed, paramString, toString
 
Methods inherited from class java.util.EventObject
 getSource, toString
 
Methods inherited from class java.lang.Object
 clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

COMPONENT_FIRST

public static final int COMPONENT_FIRST
The first number in the range of ids used for component events.

COMPONENT_LAST

public static final int COMPONENT_LAST
The last number in the range of ids used for component events.

COMPONENT_MOVED

public static final int COMPONENT_MOVED
This event indicates that the component's position changed.

COMPONENT_RESIZED

public static final int COMPONENT_RESIZED
This event indicates that the component's size changed.

COMPONENT_SHOWN

public static final int COMPONENT_SHOWN
This event indicates that the component was made visible.

COMPONENT_HIDDEN

public static final int COMPONENT_HIDDEN
This event indicates that the component was rendered invisible.
Constructor Detail

ComponentEvent

public ComponentEvent(Component source,
                      int id)
Constructs a ComponentEvent object.
Parameters:
source - the Component object that originated the event
id - an integer indicating the type of event
Method Detail

getComponent

public Component getComponent()
Returns the originator of the event.
Returns:
the Component object that originated the event

paramString

public String paramString()
Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.
Returns:
a string identifying the event and its attributes
Overrides:
paramString in class AWTEvent

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