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

ItemEvent (Java SE 19 & JDK 19)

All Implemented Interfaces:

Serializable

A semantic event which indicates that an item was selected or deselected. This high-level event is generated by an ItemSelectable object (such as a List) when an item is selected or deselected by the user. The event is passed to every

object which registered to receive such events using the component's

method.

The object that implements the ItemListener interface gets this ItemEvent when the event occurs. The listener is spared the details of processing individual mouse movements and mouse clicks, and can instead process a "meaningful" (semantic) event like "item selected" or "item deselected".

An unspecified behavior will be caused if the id parameter of any particular ItemEvent instance is not in the range from ITEM_FIRST to ITEM_LAST.

The stateChange of any ItemEvent instance takes one of the following values:

• ItemEvent.SELECTED
• ItemEvent.DESELECTED

Assigning the value different from listed above will cause an unspecified behavior.

Since:

1.1

See Also:

• ItemSelectable
• ItemListener
• Tutorial: Writing an Item Listener
• Serialized Form

• Field Summary

  Fields

  static final int

  This state-change-value indicates that a selected item was deselected.

  static final int

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

  static final int

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

  static final int

  This event id indicates that an item's state changed.

  static final int

  This state-change value indicates that an item was selected.

  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 an ItemEvent object.

• Method Summary

  Returns the item affected by the event.

  Returns the originator of the event.

  int

  Returns the type of state change (selected or deselected).

  Returns a parameter string identifying this item event.

• Field Details
  • ITEM_FIRST

    public static final int ITEM_FIRST

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

    See Also:

    • Constant Field Values

  • ITEM_LAST

    public static final int ITEM_LAST

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

    See Also:

    • Constant Field Values

  • ITEM_STATE_CHANGED

    public static final int ITEM_STATE_CHANGED

    This event id indicates that an item's state changed.

    See Also:

    • Constant Field Values

  • SELECTED

    public static final int SELECTED

    This state-change value indicates that an item was selected.

    See Also:

    • Constant Field Values

  • DESELECTED

    public static final int DESELECTED

    This state-change-value indicates that a selected item was deselected.

    See Also:

    • Constant Field Values

• Constructor Details
  • ItemEvent

    Constructs an

    ItemEvent

    object.

    This method throws an IllegalArgumentException if source is null.

    Parameters:

    source - The ItemSelectable object that originated the event

    id - The integer that identifies the event type. For information on allowable values, see the class description for ItemEvent

    item - An object -- the item affected by the event

    stateChange - An integer that indicates whether the item was selected or deselected. For information on allowable values, see the class description for ItemEvent

    Throws:

    IllegalArgumentException - if source is null

    See Also:

    • getItemSelectable()
    • AWTEvent.getID()
    • getStateChange()

• Method Details
  • getItemSelectable

    Returns the originator of the event.

    Returns:

    the ItemSelectable object that originated the event.

  • getItem

    Returns the item affected by the event.

    Returns:

    the item (object) that was affected by the event

  • getStateChange

    public int getStateChange()

    Returns the type of state change (selected or deselected).

    Returns:

    an integer that indicates whether the item was selected or deselected

    See Also:

    • SELECTED
    • DESELECTED

  • paramString

    Returns a parameter string identifying this item 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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