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.

CARET_POSITION_CHANGED

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.

INPUT_METHOD_FIRST

public static final int INPUT_METHOD_FIRST

Marks the first integer id for the range of input method event ids.

INPUT_METHOD_LAST

public static final int INPUT_METHOD_LAST

Marks the last integer id for the range of input method event ids.

INPUT_METHOD_TEXT_CHANGED

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.

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 {@link java.awt.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

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

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 {@link java.awt.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

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

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.

getCommittedCharacterCount

public int getCommittedCharacterCount()

Gets the number of committed characters in the text.

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.

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.

getWhen

public long getWhen()

Returns the time stamp of when this event occurred.

Returns:

this event's timestamp

isConsumed

public boolean isConsumed()

Returns whether or not this event has been consumed.

Overrides:

isConsumed in class AWTEvent

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