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## java.awt.event
Class ComponentEvent

    java.lang.Object
      |
      +--java.util.EventObject
            |
            +--java.awt.AWTEvent
                  |
                  +--java.awt.event.ComponentEvent

All Implemented Interfaces:
  Serializable

Direct Known Subclasses:
  ContainerEvent, FocusEvent, InputEvent, PaintEvent, WindowEvent

public class ComponentEvent
extends AWTEvent

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.

Since:
  1.1
See Also:
  `ComponentAdapter`, `ComponentListener`, Tutorial: Writing a Component Listener, Reference: The Java Class Libraries (update file), Serialized Form

Field Summary
`static int` | `COMPONENT_FIRST` The first number in the range of ids used for component events.
`static int` | `COMPONENT_HIDDEN` This event indicates that the component was rendered invisible.
`static int` | `COMPONENT_LAST` The last number in the range of ids used for component events.
`static int` | `COMPONENT_MOVED` This event indicates that the component's position changed.
`static int` | `COMPONENT_RESIZED` This event indicates that the component's size changed.
`static int` | `COMPONENT_SHOWN` This event indicates that the component was made visible.

Fields inherited from 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_MASK`

Fields inherited from class java.util.EventObject
`source`

Constructor Summary
`ComponentEvent(Component source, int id)` Constructs a `ComponentEvent` object.

Method Summary
`Component` | `getComponent()` Returns the originator of the event.
`String` | `paramString()` Returns a parameter string identifying this event.

Methods inherited from class java.awt.AWTEvent
`consume, getID, isConsumed, setSource, toString`

Methods inherited from class java.util.EventObject
`getSource`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### 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

    public static final int COMPONENT_MOVED

  This event indicates that the component's position changed.

  See Also:
    Constant Field Values

### COMPONENT_RESIZED

    public static final int COMPONENT_RESIZED

  This event indicates that the component's size changed.

  See Also:
    Constant Field Values

### COMPONENT_SHOWN

    public static final int COMPONENT_SHOWN

  This event indicates that the component was made visible.

  See Also:
    Constant Field Values

### COMPONENT_HIDDEN

    public static final int COMPONENT_HIDDEN

  This event indicates that the component was rendered invisible.

  See Also:
    Constant Field Values

Constructor Detail

### ComponentEvent

    public ComponentEvent(Component source,
                          int id)

  Constructs a `ComponentEvent` object.

  Note that passing in an invalid `id` results in unspecified behavior.

Parameters:
  `source` - the `Component` that originated the event
  `id` - an integer indicating the type of event

Method Detail

### getComponent

    public Component 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

    public String 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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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.