Class ComponentEvent
- All Implemented Interfaces:
- Serializable
- Direct Known Subclasses:
- ContainerEvent,- FocusEvent,- InputEvent,- PaintEvent,- WindowEvent
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.
- Since:
- 1.1
- See Also:
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Field SummaryFieldsModifier and TypeFieldDescriptionstatic final intThe first number in the range of ids used for component events.static final intThis event indicates that the component was rendered invisible.static final intThe last number in the range of ids used for component events.static final intThis event indicates that the component's position changed.static final intThis event indicates that the component's size changed.static final intThis event indicates that the component was made visible.Fields declared in class java.awt.AWTEventACTION_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_MASKFields declared in class java.util.EventObjectsource
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Constructor SummaryConstructorsConstructorDescriptionComponentEvent(Component source, int id) Constructs aComponentEventobject.
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Method SummaryModifier and TypeMethodDescriptionReturns the originator of the event.Returns a parameter string identifying this event.Methods declared in class java.util.EventObjectgetSource
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Field Details- 
COMPONENT_FIRSTpublic static final int COMPONENT_FIRSTThe first number in the range of ids used for component events.- See Also:
 
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COMPONENT_LASTpublic static final int COMPONENT_LASTThe last number in the range of ids used for component events.- See Also:
 
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COMPONENT_MOVEDThis event indicates that the component's position changed.- See Also:
 
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COMPONENT_RESIZEDThis event indicates that the component's size changed.- See Also:
 
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COMPONENT_SHOWNThis event indicates that the component was made visible.- See Also:
 
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COMPONENT_HIDDENThis event indicates that the component was rendered invisible.- See Also:
 
 
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Constructor Details- 
ComponentEventConstructs aComponentEventobject.This method throws an IllegalArgumentExceptionifsourceisnull.- Parameters:
- source- The- Componentthat originated the event
- id- An integer indicating the type of event. For information on allowable values, see the class description for- ComponentEvent
- Throws:
- IllegalArgumentException- if- sourceis null
- See Also:
 
 
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Method Details- 
getComponentReturns the originator of the event.- Returns:
- the Componentobject that originated the event, ornullif the object is not aComponent.
 
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paramStringReturns a parameter string identifying this event. This method is useful for event-logging and for debugging.- Overrides:
- paramStringin class- AWTEvent
- Returns:
- a string identifying the event and its attributes
 
 
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