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Showing content from https://docs.oracle.com/en/java/javase/19/docs/api/java.desktop/java/awt/event/ContainerEvent.html below:

ContainerEvent (Java SE 19 & JDK 19)

All Implemented Interfaces:

Serializable

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 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:

• ContainerAdapter
• ContainerListener
• Tutorial: Writing a Container Listener
• Serialized Form

• Field Summary

  Fields

  static final int

  This event indicates that a component was added to the container.

  static final int

  This event indicates that a component was removed from the container.

  static final int

  The first number in the range of ids used for container events.

  static final int

  The last number in the range of ids used for container events.

  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
• Constructor Summary

  Constructors

  Constructs a ContainerEvent object.

• Method Summary

  Returns the component that was affected by the event.

  Returns the originator of the event.

  Returns a parameter string identifying this event.

• Field Details
  • CONTAINER_FIRST

    public static final int CONTAINER_FIRST

    The first number in the range of ids used for container events.

    See Also:

    • Constant Field Values

  • CONTAINER_LAST

    public static final int CONTAINER_LAST

    The last number in the range of ids used for container events.

    See Also:

    • Constant Field Values

  • COMPONENT_ADDED

    public static final int COMPONENT_ADDED

    This event indicates that a component was added to the container.

    See Also:

    • Constant Field Values

  • COMPONENT_REMOVED

    public static final int COMPONENT_REMOVED

    This event indicates that a component was removed from the container.

    See Also:

    • Constant Field Values

• Constructor Details
  • ContainerEvent

    Constructs a

    ContainerEvent

    object.

    This method throws an IllegalArgumentException if source is null.

    Parameters:

    source - The Component object (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 source is null

    See Also:

    • getContainer()
    • AWTEvent.getID()
    • getChild()

• Method Details
  • getContainer

    Returns the originator of the event.

    Returns:

    the Container object that originated the event, or null if the object is not a Container.

  • getChild

    Returns the component that was affected by the event.

    Returns:

    the Component object that was added or removed

  • paramString

    Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.

    Overrides:

    paramString in class ComponentEvent

    Returns:

    a string identifying the event and its attributes

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