InputMethodEvent (Java Platform SE 8 )
Keywords: java.awt.event.InputMethodEvent class
Date: 2016-12-09

java.awt.event

## Class InputMethodEvent

- java.lang.Object
- - java.util.EventObject
  - - java.awt.AWTEvent
    - - java.awt.event.InputMethodEvent

- All Implemented Interfaces:
    Serializable

      public class InputMethodEvent
      extends AWTEvent

  Input method events contain information about text that is being composed using an input method. Whenever the text changes, the input method sends an event. If the text component that's currently using the input method is an active client, the event is dispatched to that component. Otherwise, it is dispatched to a separate composition window.

  The text included with the input method event consists of two parts: committed text and composed text. Either part may be empty. The two parts together replace any uncommitted composed text sent in previous events, or the currently selected committed text. Committed text should be integrated into the text component's persistent data, it will not be sent again. Composed text may be sent repeatedly, with changes to reflect the user's editing operations. Committed text always precedes composed text.

  Since:
    1.2
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `CARET_POSITION_CHANGED` The event type indicating a changed insertion point in input method text.
    `static int` | `INPUT_METHOD_FIRST` Marks the first integer id for the range of input method event ids.
    `static int` | `INPUT_METHOD_LAST` Marks the last integer id for the range of input method event ids.
    `static int` | `INPUT_METHOD_TEXT_CHANGED` The event type indicating changed input method text.

    - ### 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

    Constructors
    Constructor and Description
    `InputMethodEvent(Component source, int id, AttributedCharacterIterator text, int committedCharacterCount, TextHitInfo caret, TextHitInfo visiblePosition)` Constructs an `InputMethodEvent` with the specified source component, type, text, caret, and visiblePosition.
    `InputMethodEvent(Component source, int id, long when, AttributedCharacterIterator text, int committedCharacterCount, TextHitInfo caret, TextHitInfo visiblePosition)` Constructs an `InputMethodEvent` with the specified source component, type, time, text, caret, and visiblePosition.
    `InputMethodEvent(Component source, int id, TextHitInfo caret, TextHitInfo visiblePosition)` Constructs an `InputMethodEvent` with the specified source component, type, caret, and visiblePosition.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `consume()` Consumes this event so that it will not be processed in the default manner by the source which originated it.
    `TextHitInfo` | `getCaret()` Gets the caret.
    `int` | `getCommittedCharacterCount()` Gets the number of committed characters in the text.
    `AttributedCharacterIterator` | `getText()` Gets the combined committed and composed text.
    `TextHitInfo` | `getVisiblePosition()` Gets the position that's most important to be visible.
    `long` | `getWhen()` Returns the time stamp of when this event occurred.
    `boolean` | `isConsumed()` Returns whether or not this event has been consumed.
    `String` | `paramString()` Returns a parameter string identifying this event.

    - ### Methods inherited from class java.awt.AWTEvent

      `getID, 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

    - #### INPUT_METHOD_FIRST

          @Native
          public static final int INPUT_METHOD_FIRST

      Marks the first integer id for the range of input method event ids.
      See Also:
        Constant Field Values

    - #### INPUT_METHOD_TEXT_CHANGED

          @Native
          public static final int INPUT_METHOD_TEXT_CHANGED

      The event type indicating changed input method text. This event is generated by input methods while processing input.
      See Also:
        Constant Field Values

    - #### CARET_POSITION_CHANGED

          @Native
          public static final int CARET_POSITION_CHANGED

      The event type indicating a changed insertion point in input method text. This event is generated by input methods while processing input if only the caret changed.
      See Also:
        Constant Field Values

    - #### INPUT_METHOD_LAST

          @Native
          public static final int INPUT_METHOD_LAST

      Marks the last integer id for the range of input method event ids.
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### InputMethodEvent

          public InputMethodEvent(Component source,
                                  int id,
                                  long when,
                                  AttributedCharacterIterator text,
                                  int committedCharacterCount,
                                  TextHitInfo caret,
                                  TextHitInfo visiblePosition)

      Constructs an `InputMethodEvent` with the specified source component, type, time, text, caret, and visiblePosition.

      The offsets of caret and visiblePosition are relative to the current composed text; that is, the composed text within `text` if this is an `INPUT_METHOD_TEXT_CHANGED` event, the composed text within the `text` of the preceding `INPUT_METHOD_TEXT_CHANGED` event otherwise.

      Note that passing in an invalid `id` results in unspecified behavior. This method throws an `IllegalArgumentException` if `source` is `null`.

      Parameters:
        `source` - the object where the event originated
        `id` - the event type
        `when` - a long integer that specifies the time the event occurred
        `text` - the combined committed and composed text, committed text first; must be `null` when the event type is `CARET_POSITION_CHANGED`; may be `null` for `INPUT_METHOD_TEXT_CHANGED` if there's no committed or composed text
        `committedCharacterCount` - the number of committed characters in the text
        `caret` - the caret (a.k.a. insertion point); `null` if there's no caret within current composed text
        `visiblePosition` - the position that's most important to be visible; `null` if there's no recommendation for a visible position within current composed text
      Throws:
        `IllegalArgumentException` - if `id` is not in the range `INPUT_METHOD_FIRST`..`INPUT_METHOD_LAST`; or if id is `CARET_POSITION_CHANGED` and `text` is not `null`; or if `committedCharacterCount` is not in the range `0`..`(text.getEndIndex() - text.getBeginIndex())`
        `IllegalArgumentException` - if `source` is null
      Since:
        1.4

    - #### InputMethodEvent

          public InputMethodEvent(Component source,
                                  int id,
                                  AttributedCharacterIterator text,
                                  int committedCharacterCount,
                                  TextHitInfo caret,
                                  TextHitInfo visiblePosition)

      Constructs an `InputMethodEvent` with the specified source component, type, text, caret, and visiblePosition.

      The offsets of caret and visiblePosition are relative to the current composed text; that is, the composed text within `text` if this is an `INPUT_METHOD_TEXT_CHANGED` event, the composed text within the `text` of the preceding `INPUT_METHOD_TEXT_CHANGED` event otherwise. The time stamp for this event is initialized by invoking `EventQueue.getMostRecentEventTime()`.

      Note that passing in an invalid `id` results in unspecified behavior. This method throws an `IllegalArgumentException` if `source` is `null`.

      Parameters:
        `source` - the object where the event originated
        `id` - the event type
        `text` - the combined committed and composed text, committed text first; must be `null` when the event type is `CARET_POSITION_CHANGED`; may be `null` for `INPUT_METHOD_TEXT_CHANGED` if there's no committed or composed text
        `committedCharacterCount` - the number of committed characters in the text
        `caret` - the caret (a.k.a. insertion point); `null` if there's no caret within current composed text
        `visiblePosition` - the position that's most important to be visible; `null` if there's no recommendation for a visible position within current composed text
      Throws:
        `IllegalArgumentException` - if `id` is not in the range `INPUT_METHOD_FIRST`..`INPUT_METHOD_LAST`; or if id is `CARET_POSITION_CHANGED` and `text` is not `null`; or if `committedCharacterCount` is not in the range `0`..`(text.getEndIndex() - text.getBeginIndex())`
        `IllegalArgumentException` - if `source` is null

    - #### InputMethodEvent

          public InputMethodEvent(Component source,
                                  int id,
                                  TextHitInfo caret,
                                  TextHitInfo visiblePosition)

      Constructs an `InputMethodEvent` with the specified source component, type, caret, and visiblePosition. The text is set to `null`, `committedCharacterCount` to 0.

      The offsets of `caret` and `visiblePosition` are relative to the current composed text; that is, the composed text within the `text` of the preceding `INPUT_METHOD_TEXT_CHANGED` event if the event being constructed as a `CARET_POSITION_CHANGED` event. For an `INPUT_METHOD_TEXT_CHANGED` event without text, `caret` and `visiblePosition` must be `null`. The time stamp for this event is initialized by invoking `EventQueue.getMostRecentEventTime()`.

      Note that passing in an invalid `id` results in unspecified behavior. This method throws an `IllegalArgumentException` if `source` is `null`.

      Parameters:
        `source` - the object where the event originated
        `id` - the event type
        `caret` - the caret (a.k.a. insertion point); `null` if there's no caret within current composed text
        `visiblePosition` - the position that's most important to be visible; `null` if there's no recommendation for a visible position within current composed text
      Throws:
        `IllegalArgumentException` - if `id` is not in the range `INPUT_METHOD_FIRST`..`INPUT_METHOD_LAST`
        `IllegalArgumentException` - if `source` is null

  - ### Method Detail

    - #### getText

          public AttributedCharacterIterator getText()

      Gets the combined committed and composed text. Characters from index 0 to index `getCommittedCharacterCount() - 1` are committed text, the remaining characters are composed text.
      Returns:
        the text. Always null for CARET_POSITION_CHANGED; may be null for INPUT_METHOD_TEXT_CHANGED if there's no composed or committed text.

    - #### getCommittedCharacterCount

          public int getCommittedCharacterCount()

      Gets the number of committed characters in the text.

    - #### getCaret

          public TextHitInfo getCaret()

      Gets the caret.

      The offset of the caret is relative to the current composed text; that is, the composed text within getText() if this is an `INPUT_METHOD_TEXT_CHANGED` event, the composed text within getText() of the preceding `INPUT_METHOD_TEXT_CHANGED` event otherwise.

      Returns:
        the caret (a.k.a. insertion point). Null if there's no caret within current composed text.

    - #### getVisiblePosition

          public TextHitInfo getVisiblePosition()

      Gets the position that's most important to be visible.

      The offset of the visible position is relative to the current composed text; that is, the composed text within getText() if this is an `INPUT_METHOD_TEXT_CHANGED` event, the composed text within getText() of the preceding `INPUT_METHOD_TEXT_CHANGED` event otherwise.

      Returns:
        the position that's most important to be visible. Null if there's no recommendation for a visible position within current composed text.

    - #### consume

          public void consume()

      Consumes this event so that it will not be processed in the default manner by the source which originated it.
      Overrides:
        `consume` in class `AWTEvent`

    - #### isConsumed

          public boolean isConsumed()

      Returns whether or not this event has been consumed.
      Overrides:
        `isConsumed` in class `AWTEvent`
      See Also:
        `consume()`

    - #### getWhen

          public long getWhen()

      Returns the time stamp of when this event occurred.
      Returns:
        this event's timestamp
      Since:
        1.4

    - #### paramString

          public String paramString()

      Returns a parameter string identifying this event. This method is useful for event-logging and for debugging. It contains the event ID in text form, the characters of the committed and composed text separated by "+", the number of committed characters, the caret, and the visible position.
      Overrides:
        `paramString` in class `AWTEvent`
      Returns:
        a string identifying the event and its attributes

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