- java.lang.Object
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- java.util.EventObject
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- java.awt.AWTEvent
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- java.awt.event.ComponentEvent
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- java.awt.event.ContainerEvent
 
 
 
 
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- All Implemented Interfaces:
- Serializable
 
 public class ContainerEvent extends ComponentEvent A low-level event which indicates that a container's contents changed because a component was added or removed.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 ContainerListenerorContainerAdapterobject which registered to receive such events using the component'saddContainerListenermethod. (ContainerAdapterobjects implement theContainerListenerinterface.) Each such listener object gets thisContainerEventwhen the event occurs.An unspecified behavior will be caused if the idparameter of any particularContainerEventinstance is not in the range fromCONTAINER_FIRSTtoCONTAINER_LAST.- Since:
- 1.1
- See Also:
- ContainerAdapter,- ContainerListener, Tutorial: Writing a Container Listener, Serialized Form
 
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Field SummaryFields Modifier and Type Field Description static intCOMPONENT_ADDEDThis event indicates that a component was added to the container.static intCOMPONENT_REMOVEDThis event indicates that a component was removed from the container.static intCONTAINER_FIRSTThe first number in the range of ids used for container events.static intCONTAINER_LASTThe 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_SHOWN
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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_MASK
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Fields declared in class java.util.EventObjectsource
 
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Constructor SummaryConstructors Constructor Description ContainerEvent(Component source, int id, Component child)Constructs aContainerEventobject.
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Method SummaryAll Methods Instance Methods Concrete Methods Modifier and Type Method Description ComponentgetChild()Returns the component that was affected by the event.ContainergetContainer()Returns the originator of the event.StringparamString()Returns a parameter string identifying this event.- 
Methods declared in class java.awt.event.ComponentEventgetComponent
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Methods declared in class java.util.EventObjectgetSource
 
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Field Detail- 
CONTAINER_FIRSTpublic static final int CONTAINER_FIRST The first number in the range of ids used for container events.- See Also:
- Constant Field Values
 
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CONTAINER_LASTpublic static final int CONTAINER_LAST The last number in the range of ids used for container events.- See Also:
- Constant Field Values
 
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COMPONENT_ADDEDpublic static final int COMPONENT_ADDED This event indicates that a component was added to the container.- See Also:
- Constant Field Values
 
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COMPONENT_REMOVEDpublic static final int COMPONENT_REMOVED This event indicates that a component was removed from the container.- See Also:
- Constant Field Values
 
 
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Constructor Detail- 
ContainerEventpublic ContainerEvent(Component source, int id, Component child) Constructs 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:
- getContainer(),- AWTEvent.getID(),- getChild()
 
 
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Method Detail- 
getContainerpublic Container getContainer() Returns the originator of the event.- Returns:
- the Containerobject that originated the event, ornullif the object is not aContainer.
 
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getChildpublic Component getChild() Returns the component that was affected by the event.- Returns:
- the Component object that was added or removed
 
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paramStringpublic String paramString() Returns 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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