- 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 Summary
FieldsModifier 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.ComponentEvent
COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWNFields declared in 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_MASKFields declared in class java.util.EventObject
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Constructor Summary
ConstructorsConstructorDescriptionContainerEvent(Component source, int id, Component child) Constructs aContainerEventobject. -
Method Summary
Modifier 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.ComponentEvent
getComponentMethods declared in class java.util.EventObject
getSource
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Field Details
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CONTAINER_FIRST
public static final int CONTAINER_FIRSTThe first number in the range of ids used for container events.- See Also:
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CONTAINER_LAST
public static final int CONTAINER_LASTThe last number in the range of ids used for container events.- See Also:
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COMPONENT_ADDED
public static final int COMPONENT_ADDEDThis event indicates that a component was added to the container.- See Also:
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COMPONENT_REMOVED
public static final int COMPONENT_REMOVEDThis event indicates that a component was removed from the container.- See Also:
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Constructor Details
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ContainerEvent
Constructs aContainerEventobject.This method throws an
IllegalArgumentExceptionifsourceisnull.- Parameters:
source- TheComponentobject (container) that originated the eventid- An integer indicating the type of event. For information on allowable values, see the class description forContainerEventchild- the component that was added or removed- Throws:
IllegalArgumentException- ifsourceis null- See Also:
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Method Details
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getContainer
Returns the originator of the event.- Returns:
- the
Containerobject that originated the event, ornullif the object is not aContainer.
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getChild
Returns the component that was affected by the event.- Returns:
- the Component object that was added or removed
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paramString
Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.- Overrides:
paramStringin classComponentEvent- Returns:
- a string identifying the event and its attributes
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