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

ComponentEvent (Java SE 19 & JDK 19)

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

ContainerEvent, FocusEvent, InputEvent, PaintEvent, WindowEvent

A low-level event which indicates that a component moved, changed size, or changed visibility (also, the root class for the other component-level events).

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:

• ComponentAdapter
• ComponentListener
• Tutorial: Writing a Component Listener
• Serialized Form

• Field Summary

  Fields

  static final int

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

  static final int

  This event indicates that the component was rendered invisible.

  static final int

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

  static final int

  This event indicates that the component's position changed.

  static final int

  This event indicates that the component's size changed.

  static final int

  This 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_MASK
• Constructor Summary

  Constructors

  Constructs a ComponentEvent object.

• Method Summary

  Returns the originator of the event.

  Returns a parameter string identifying this event.

• Field Details
  • COMPONENT_FIRST

    public static final int COMPONENT_FIRST

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

    See Also:

    • Constant Field Values

  • COMPONENT_LAST

    public static final int COMPONENT_LAST

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

    See Also:

    • Constant Field Values

  • COMPONENT_MOVED @Native public static final int COMPONENT_MOVED

    This event indicates that the component's position changed.

    See Also:

    • Constant Field Values

  • COMPONENT_RESIZED @Native public static final int COMPONENT_RESIZED

    This event indicates that the component's size changed.

    See Also:

    • Constant Field Values

  • COMPONENT_SHOWN @Native public static final int COMPONENT_SHOWN

    This event indicates that the component was made visible.

    See Also:

    • Constant Field Values

  • COMPONENT_HIDDEN @Native public static final int COMPONENT_HIDDEN

    This event indicates that the component was rendered invisible.

    See Also:

    • Constant Field Values

• Constructor Details
  • ComponentEvent public ComponentEvent(Component source, int id)

    Constructs a

    ComponentEvent

    object.

    This method throws an IllegalArgumentException if source is null.

    Parameters:

    source - The Component that 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 source is null

    See Also:

    • getComponent()
    • AWTEvent.getID()

• Method Details
  • getComponent

    Returns the originator of the event.

    Returns:

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

  • paramString

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

    Overrides:

    paramString in class AWTEvent

    Returns:

    a string identifying the event and its attributes

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