- java.lang.Object
-
- java.util.EventObject
-
- java.awt.AWTEvent
-
- java.awt.event.ComponentEvent
-
- All Implemented Interfaces:
- Serializable
- Direct Known 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
orComponentAdapter
object which registered to receive such events using the component'saddComponentListener
method. (ComponentAdapter
objects implement theComponentListener
interface.) Each such listener object gets thisComponentEvent
when the event occurs.An unspecified behavior will be caused if the
id
parameter of any particularComponentEvent
instance is not in the range fromCOMPONENT_FIRST
toCOMPONENT_LAST
.- Since:
- 1.1
- See Also:
ComponentAdapter
,ComponentListener
, Tutorial: Writing a Component Listener, Serialized Form
-
-
Field Summary
Fields Modifier and Type Field and Description 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, 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 ComponentEvent(Component source, int id)
Constructs aComponentEvent
object.
-
Method Summary
Methods Modifier and Type Method and Description 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, setSource, toString
-
Methods inherited from class java.util.EventObject
getSource
-
-
-
-
Field Detail
-
COMPONENT_FIRST
public static final int COMPONENT_FIRST
The first number in the range of ids used for component events.- See Also:
- Constant Field Values
-
COMPONENT_LAST
public static final int COMPONENT_LAST
The last number in the range of ids used for component events.- See Also:
- Constant Field Values
-
COMPONENT_MOVED
public static final int COMPONENT_MOVED
This event indicates that the component's position changed.- See Also:
- Constant Field Values
-
COMPONENT_RESIZED
public static final int COMPONENT_RESIZED
This event indicates that the component's size changed.- See Also:
- Constant Field Values
-
COMPONENT_SHOWN
public static final int COMPONENT_SHOWN
This event indicates that the component was made visible.- See Also:
- Constant Field Values
-
COMPONENT_HIDDEN
public static final int COMPONENT_HIDDEN
This event indicates that the component was rendered invisible.- See Also:
- Constant Field Values
-
-
Constructor Detail
-
ComponentEvent
public ComponentEvent(Component source, int id)
Constructs aComponentEvent
object.This method throws an
IllegalArgumentException
ifsource
isnull
.- Parameters:
source
- TheComponent
that originated the eventid
- An integer indicating the type of event. For information on allowable values, see the class description forComponentEvent
- Throws:
IllegalArgumentException
- ifsource
is null- See Also:
getComponent()
,AWTEvent.getID()
-
-
Method Detail
-
getComponent
public Component getComponent()
Returns the originator of the event.- Returns:
- the
Component
object that originated the event, ornull
if the object is not aComponent
.
-
paramString
public String paramString()
Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.- Overrides:
paramString
in classAWTEvent
- Returns:
- a string identifying the event and its attributes
-
-
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Document heeft de 11/06/2005 gemaakt, de laatste keer de 04/03/2020 gewijzigd
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