Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class TextEvent - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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Java^TM 2 Platform
Standard Edition

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java.awt.event
Class TextEvent

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

public class TextEvent
extends AWTEvent

A semantic event which indicates that an object's text changed. This high-level event is generated by an object (such as a TextComponent) when its text changes. The event is passed to every TextListener object which registered to receive such events using the component's addTextListener method.

The object that implements the TextListener interface gets this TextEvent when the event occurs. The listener is spared the details of processing individual mouse movements and key strokes Instead, it can process a "meaningful" (semantic) event like "text changed".

See Also:: TextComponent, TextListener, Tutorial: Writing a Text Listener, Reference: The Java Class Libraries (update file), Serialized Form

Field Summary

static int TEXT_FIRST
          The first number in the range of ids used for text events.

static int TEXT_LAST
          The last number in the range of ids used for text events.

static int TEXT_VALUE_CHANGED
          This event id indicates that object's text changed.

Fields inherited from class java.awt.AWTEvent

ACTION_EVENT_MASK, ADJUSTMENT_EVENT_MASK, COMPONENT_EVENT_MASK, consumed, CONTAINER_EVENT_MASK, FOCUS_EVENT_MASK, id, INPUT_METHOD_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK

Fields inherited from class java.util.EventObject

source

Constructor Summary

TextEvent(Object source, int id)
          Constructs a TextEvent object.

Method Summary

String paramString()
          Returns a parameter string identifying this text event.

Methods inherited from class java.awt.AWTEvent

consume, finalize, getID, isConsumed, toString

Methods inherited from class java.util.EventObject

getSource

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

TEXT_FIRST

public static final int TEXT_FIRST

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

TEXT_LAST

public static final int TEXT_LAST

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

TEXT_VALUE_CHANGED

public static final int TEXT_VALUE_CHANGED

This event id indicates that object's text changed.

Constructor Detail

TextEvent

public TextEvent(Object source,
                 int id)

Constructs a TextEvent object.

Parameters:: source - the (TextComponent) object that originated the event; id - an integer that identifies the event type

Method Detail

paramString

public String paramString()

Returns a parameter string identifying this text 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