Class ContainerEvent
- All Implemented Interfaces:
- Serializable
Container events are provided for notification purposes ONLY; The AWT will automatically handle changes to the containers contents internally so that the program works properly regardless of whether the program is receiving these events or not.
 This low-level event is generated by a container object (such as a
 Panel) when a component is added to it or removed from it.
 The event is passed to every ContainerListener
 or ContainerAdapter object which registered to receive such
 events using the component's addContainerListener method.
 (ContainerAdapter objects implement the
 ContainerListener interface.) Each such listener object
 gets this ContainerEvent when the event occurs.
 
 An unspecified behavior will be caused if the id parameter
 of any particular ContainerEvent instance is not
 in the range from CONTAINER_FIRST to CONTAINER_LAST.
- Since:
- 1.1
- See Also:
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Field SummaryFieldsModifier and TypeFieldDescriptionstatic final intThis event indicates that a component was added to the container.static final intThis event indicates that a component was removed from the container.static final intThe first number in the range of ids used for container events.static final intThe last number in the range of ids used for container events.Fields declared in class java.awt.event.ComponentEventCOMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWNFields 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 SummaryConstructorsConstructorDescriptionContainerEvent(Component source, int id, Component child) Constructs aContainerEventobject.
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Method SummaryModifier and TypeMethodDescriptiongetChild()Returns the component that was affected by the event.Returns the originator of the event.Returns a parameter string identifying this event.Methods declared in class java.awt.event.ComponentEventgetComponentMethods declared in class java.util.EventObjectgetSource
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Field Details- 
CONTAINER_FIRSTpublic static final int CONTAINER_FIRSTThe first number in the range of ids used for container events.- See Also:
 
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CONTAINER_LASTpublic static final int CONTAINER_LASTThe last number in the range of ids used for container events.- See Also:
 
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COMPONENT_ADDEDpublic static final int COMPONENT_ADDEDThis event indicates that a component was added to the container.- See Also:
 
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COMPONENT_REMOVEDpublic static final int COMPONENT_REMOVEDThis event indicates that a component was removed from the container.- See Also:
 
 
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Constructor Details- 
ContainerEventConstructs aContainerEventobject.This method throws an IllegalArgumentExceptionifsourceisnull.- Parameters:
- source- The- Componentobject (container) that originated the event
- id- An integer indicating the type of event. For information on allowable values, see the class description for- ContainerEvent
- child- the component that was added or removed
- Throws:
- IllegalArgumentException- if- sourceis null
- See Also:
 
 
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Method Details- 
getContainerReturns the originator of the event.- Returns:
- the Containerobject that originated the event, ornullif the object is not aContainer.
 
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getChildReturns the component that was affected by the event.- Returns:
- the Component object that was added or removed
 
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paramStringReturns a parameter string identifying this event. This method is useful for event-logging and for debugging.- Overrides:
- paramStringin class- ComponentEvent
- Returns:
- a string identifying the event and its attributes
 
 
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