下面列出了java.text.AttributedCharacterIterator#getBeginIndex ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
/**
* Draws a string of attributed characters at {@code (x, y)}.
*
* @param iterator an iterator over the characters ({@code null} not
* permitted).
* @param x the x-coordinate.
* @param y the y-coordinate.
*/
@Override
public void drawString(AttributedCharacterIterator iterator, float x,
float y) {
Set<AttributedCharacterIterator.Attribute>
s = iterator.getAllAttributeKeys();
if (!s.isEmpty()) {
TextLayout layout = new TextLayout(iterator,
getFontRenderContext());
layout.draw(this, x, y);
} else {
StringBuilder strb = new StringBuilder();
iterator.first();
for (int i = iterator.getBeginIndex(); i < iterator.getEndIndex();
i++) {
strb.append(iterator.current());
iterator.next();
}
drawString(strb.toString(), x, y);
}
}
private static AttributedCharacterIterator getTrimmedTrailingSpacesIterator
(AttributedCharacterIterator iterator) {
int curIdx = iterator.getIndex();
char c = iterator.last();
while(c != CharacterIterator.DONE && Character.isWhitespace(c)) {
c = iterator.previous();
}
if (c != CharacterIterator.DONE) {
int endIdx = iterator.getIndex();
if (endIdx == iterator.getEndIndex() - 1) {
iterator.setIndex(curIdx);
return iterator;
} else {
AttributedString trimmedText = new AttributedString(iterator,
iterator.getBeginIndex(), endIdx + 1);
return trimmedText.getIterator();
}
} else {
return null;
}
}
private static AttributedCharacterIterator getTrimmedTrailingSpacesIterator
(AttributedCharacterIterator iterator) {
int curIdx = iterator.getIndex();
char c = iterator.last();
while(c != CharacterIterator.DONE && Character.isWhitespace(c)) {
c = iterator.previous();
}
if (c != CharacterIterator.DONE) {
int endIdx = iterator.getIndex();
if (endIdx == iterator.getEndIndex() - 1) {
iterator.setIndex(curIdx);
return iterator;
} else {
AttributedString trimmedText = new AttributedString(iterator,
iterator.getBeginIndex(), endIdx + 1);
return trimmedText.getIterator();
}
} else {
return null;
}
}
/**
* Constructs a <code>TextLayout</code> from an iterator over styled text.
* <p>
* The iterator must specify a single paragraph of text because an
* entire paragraph is required for the bidirectional
* algorithm.
* @param text the styled text to display
* @param frc contains information about a graphics device which is needed
* to measure the text correctly.
* Text measurements can vary slightly depending on the
* device resolution, and attributes such as antialiasing. This
* parameter does not specify a translation between the
* <code>TextLayout</code> and user space.
*/
public TextLayout(AttributedCharacterIterator text, FontRenderContext frc) {
if (text == null) {
throw new IllegalArgumentException("Null iterator passed to TextLayout constructor.");
}
int start = text.getBeginIndex();
int limit = text.getEndIndex();
if (start == limit) {
throw new IllegalArgumentException("Zero length iterator passed to TextLayout constructor.");
}
int len = limit - start;
text.first();
char[] chars = new char[len];
int n = 0;
for (char c = text.first();
c != CharacterIterator.DONE;
c = text.next())
{
chars[n++] = c;
}
text.first();
if (text.getRunLimit() == limit) {
Map<? extends Attribute, ?> attributes = text.getAttributes();
Font font = singleFont(chars, 0, len, attributes);
if (font != null) {
fastInit(chars, font, attributes, frc);
return;
}
}
standardInit(text, chars, frc);
}
/**
* Constructs a <code>TextLayout</code> from an iterator over styled text.
* <p>
* The iterator must specify a single paragraph of text because an
* entire paragraph is required for the bidirectional
* algorithm.
* @param text the styled text to display
* @param frc contains information about a graphics device which is needed
* to measure the text correctly.
* Text measurements can vary slightly depending on the
* device resolution, and attributes such as antialiasing. This
* parameter does not specify a translation between the
* <code>TextLayout</code> and user space.
*/
public TextLayout(AttributedCharacterIterator text, FontRenderContext frc) {
if (text == null) {
throw new IllegalArgumentException("Null iterator passed to TextLayout constructor.");
}
int start = text.getBeginIndex();
int limit = text.getEndIndex();
if (start == limit) {
throw new IllegalArgumentException("Zero length iterator passed to TextLayout constructor.");
}
int len = limit - start;
text.first();
char[] chars = new char[len];
int n = 0;
for (char c = text.first();
c != CharacterIterator.DONE;
c = text.next())
{
chars[n++] = c;
}
text.first();
if (text.getRunLimit() == limit) {
Map<? extends Attribute, ?> attributes = text.getAttributes();
Font font = singleFont(chars, 0, len, attributes);
if (font != null) {
fastInit(chars, font, attributes, frc);
return;
}
}
standardInit(text, chars, frc);
}
/**
* Draws a string at the specified position.
*
* @param iterator the string.
* @param x the x-coordinate.
* @param y the y-coordinate.
*/
public void drawString(AttributedCharacterIterator iterator, int x, int y) {
// for now we simply want to extract the chars from the iterator
// and call an unstyled text renderer
StringBuffer sb = new StringBuffer();
int numChars = iterator.getEndIndex() - iterator.getBeginIndex();
char c = iterator.first();
for (int i = 0; i < numChars; i++) {
sb.append(c);
c = iterator.next();
}
drawString(new String(sb),x,y);
}
/**
* Return a StyledParagraph reflecting the insertion of a single character
* into the text. This method will attempt to reuse the given paragraph,
* but may create a new paragraph.
* @param aci an iterator over the text. The text should be the same as the
* text used to create (or most recently update) oldParagraph, with
* the exception of deleting a single character at deletePos.
* @param chars the characters in aci
* @param deletePos the index where a character was removed
* @param oldParagraph a StyledParagraph for the text in aci before the
* insertion
*/
public static StyledParagraph deleteChar(AttributedCharacterIterator aci,
char[] chars,
int deletePos,
StyledParagraph oldParagraph) {
// We will reuse oldParagraph unless there was a length-1 run
// at deletePos. We could do more work and check the individual
// Font and Decoration runs, but we don't right now...
deletePos -= aci.getBeginIndex();
if (oldParagraph.decorations == null && oldParagraph.fonts == null) {
oldParagraph.length -= 1;
return oldParagraph;
}
if (oldParagraph.getRunLimit(deletePos) == deletePos+1) {
if (deletePos == 0 || oldParagraph.getRunLimit(deletePos-1) == deletePos) {
return new StyledParagraph(aci, chars);
}
}
oldParagraph.length -= 1;
if (oldParagraph.decorations != null) {
deleteFrom(deletePos,
oldParagraph.decorationStarts,
oldParagraph.decorations.size());
}
if (oldParagraph.fonts != null) {
deleteFrom(deletePos,
oldParagraph.fontStarts,
oldParagraph.fonts.size());
}
return oldParagraph;
}
/**
* Return a StyledParagraph reflecting the insertion of a single character
* into the text. This method will attempt to reuse the given paragraph,
* but may create a new paragraph.
* @param aci an iterator over the text. The text should be the same as the
* text used to create (or most recently update) oldParagraph, with
* the exception of deleting a single character at deletePos.
* @param chars the characters in aci
* @param deletePos the index where a character was removed
* @param oldParagraph a StyledParagraph for the text in aci before the
* insertion
*/
public static StyledParagraph deleteChar(AttributedCharacterIterator aci,
char[] chars,
int deletePos,
StyledParagraph oldParagraph) {
// We will reuse oldParagraph unless there was a length-1 run
// at deletePos. We could do more work and check the individual
// Font and Decoration runs, but we don't right now...
deletePos -= aci.getBeginIndex();
if (oldParagraph.decorations == null && oldParagraph.fonts == null) {
oldParagraph.length -= 1;
return oldParagraph;
}
if (oldParagraph.getRunLimit(deletePos) == deletePos+1) {
if (deletePos == 0 || oldParagraph.getRunLimit(deletePos-1) == deletePos) {
return new StyledParagraph(aci, chars);
}
}
oldParagraph.length -= 1;
if (oldParagraph.decorations != null) {
deleteFrom(deletePos,
oldParagraph.decorationStarts,
oldParagraph.decorations.size());
}
if (oldParagraph.fonts != null) {
deleteFrom(deletePos,
oldParagraph.fontStarts,
oldParagraph.fonts.size());
}
return oldParagraph;
}
/**
* Return a StyledParagraph reflecting the insertion of a single character
* into the text. This method will attempt to reuse the given paragraph,
* but may create a new paragraph.
* @param aci an iterator over the text. The text should be the same as the
* text used to create (or most recently update) oldParagraph, with
* the exception of deleting a single character at deletePos.
* @param chars the characters in aci
* @param deletePos the index where a character was removed
* @param oldParagraph a StyledParagraph for the text in aci before the
* insertion
*/
public static StyledParagraph deleteChar(AttributedCharacterIterator aci,
char[] chars,
int deletePos,
StyledParagraph oldParagraph) {
// We will reuse oldParagraph unless there was a length-1 run
// at deletePos. We could do more work and check the individual
// Font and Decoration runs, but we don't right now...
deletePos -= aci.getBeginIndex();
if (oldParagraph.decorations == null && oldParagraph.fonts == null) {
oldParagraph.length -= 1;
return oldParagraph;
}
if (oldParagraph.getRunLimit(deletePos) == deletePos+1) {
if (deletePos == 0 || oldParagraph.getRunLimit(deletePos-1) == deletePos) {
return new StyledParagraph(aci, chars);
}
}
oldParagraph.length -= 1;
if (oldParagraph.decorations != null) {
deleteFrom(deletePos,
oldParagraph.decorationStarts,
oldParagraph.decorations.size());
}
if (oldParagraph.fonts != null) {
deleteFrom(deletePos,
oldParagraph.fontStarts,
oldParagraph.fonts.size());
}
return oldParagraph;
}
/**
* Return a StyledParagraph reflecting the insertion of a single character
* into the text. This method will attempt to reuse the given paragraph,
* but may create a new paragraph.
* @param aci an iterator over the text. The text should be the same as the
* text used to create (or most recently update) oldParagraph, with
* the exception of deleting a single character at deletePos.
* @param chars the characters in aci
* @param deletePos the index where a character was removed
* @param oldParagraph a StyledParagraph for the text in aci before the
* insertion
*/
public static StyledParagraph deleteChar(AttributedCharacterIterator aci,
char[] chars,
int deletePos,
StyledParagraph oldParagraph) {
// We will reuse oldParagraph unless there was a length-1 run
// at deletePos. We could do more work and check the individual
// Font and Decoration runs, but we don't right now...
deletePos -= aci.getBeginIndex();
if (oldParagraph.decorations == null && oldParagraph.fonts == null) {
oldParagraph.length -= 1;
return oldParagraph;
}
if (oldParagraph.getRunLimit(deletePos) == deletePos+1) {
if (deletePos == 0 || oldParagraph.getRunLimit(deletePos-1) == deletePos) {
return new StyledParagraph(aci, chars);
}
}
oldParagraph.length -= 1;
if (oldParagraph.decorations != null) {
deleteFrom(deletePos,
oldParagraph.decorationStarts,
oldParagraph.decorations.size());
}
if (oldParagraph.fonts != null) {
deleteFrom(deletePos,
oldParagraph.fontStarts,
oldParagraph.fonts.size());
}
return oldParagraph;
}
@Override
public void inputMethodTextChanged(InputMethodEvent e) {
int committedCharacterCount = e.getCommittedCharacterCount();
AttributedCharacterIterator text = e.getText();
composedText = null;
char c;
if (text != null) {
if (committedCharacterCount > 0) {
int toCopy = committedCharacterCount;
c = text.first();
StringBuilder sb = new StringBuilder();
while (toCopy-- > 0) {
sb.append(c);
c = text.next();
}
inputListener.type(sb.toString());
}
if (text.getEndIndex()
- (text.getBeginIndex() + committedCharacterCount) > 0) {
composedTextString = new AttributedString(text, text
.getBeginIndex()
+ committedCharacterCount, text.getEndIndex(),
IM_ATTRIBUTES);
composedTextString.addAttribute(TextAttribute.FONT, getFont());
composedText = composedTextString.getIterator();
//TODO The code below need be extended
// System.out.print(composedText.first());
// while (composedText.getIndex() < composedText.getEndIndex()) {
// System.out.print(composedText.next());
// }
}
}
e.consume();
}
public void drawString(AttributedCharacterIterator iterator,
int x, int y) {
if (iterator == null) {
throw new NullPointerException("AttributedCharacterIterator is null");
}
if (iterator.getBeginIndex() == iterator.getEndIndex()) {
return; /* nothing to draw */
}
TextLayout tl = new TextLayout(iterator, getFontRenderContext());
tl.draw(this, (float) x, (float) y);
}
/**
* Serialises an <code>AttributedString</code> object.
*
* @param as the attributed string object (<code>null</code> permitted).
* @param stream the output stream (<code>null</code> not permitted).
*
* @throws IOException if there is an I/O error.
*/
public static void writeAttributedString(AttributedString as,
ObjectOutputStream stream) throws IOException {
if (stream == null) {
throw new IllegalArgumentException("Null 'stream' argument.");
}
if (as != null) {
stream.writeBoolean(false);
AttributedCharacterIterator aci = as.getIterator();
// build a plain string from aci
// then write the string
StringBuffer plainStr = new StringBuffer();
char current = aci.first();
while (current != CharacterIterator.DONE) {
plainStr = plainStr.append(current);
current = aci.next();
}
stream.writeObject(plainStr.toString());
// then write the attributes and limits for each run
current = aci.first();
int begin = aci.getBeginIndex();
while (current != CharacterIterator.DONE) {
// write the current character - when the reader sees that this
// is not CharacterIterator.DONE, it will know to read the
// run limits and attributes
stream.writeChar(current);
// now write the limit, adjusted as if beginIndex is zero
int limit = aci.getRunLimit();
stream.writeInt(limit - begin);
// now write the attribute set
Map atts = new HashMap(aci.getAttributes());
stream.writeObject(atts);
current = aci.setIndex(limit);
}
// write a character that signals to the reader that all runs
// are done...
stream.writeChar(CharacterIterator.DONE);
}
else {
// write a flag that indicates a null
stream.writeBoolean(true);
}
}
/**
* Dispatches committed text to a client component.
* Called by composition window.
*
* @param client The component that the text should get dispatched to.
* @param text The iterator providing access to the committed
* (and possible composed) text.
* @param committedCharacterCount The number of committed characters in the text.
*/
synchronized void dispatchCommittedText(Component client,
AttributedCharacterIterator text,
int committedCharacterCount) {
// note that the client is not always the current client component -
// some host input method adapters may dispatch input method events
// through the Java event queue, and we may have switched clients while
// the event was in the queue.
if (committedCharacterCount == 0
|| text.getEndIndex() <= text.getBeginIndex()) {
return;
}
long time = System.currentTimeMillis();
dispatchingCommittedText = true;
try {
InputMethodRequests req = client.getInputMethodRequests();
if (req != null) {
// active client -> send text as InputMethodEvent
int beginIndex = text.getBeginIndex();
AttributedCharacterIterator toBeCommitted =
(new AttributedString(text, beginIndex, beginIndex + committedCharacterCount)).getIterator();
InputMethodEvent inputEvent = new InputMethodEvent(
client,
InputMethodEvent.INPUT_METHOD_TEXT_CHANGED,
toBeCommitted,
committedCharacterCount,
null, null);
client.dispatchEvent(inputEvent);
} else {
// passive client -> send text as KeyEvents
char keyChar = text.first();
while (committedCharacterCount-- > 0 && keyChar != CharacterIterator.DONE) {
KeyEvent keyEvent = new KeyEvent(client, KeyEvent.KEY_TYPED,
time, 0, KeyEvent.VK_UNDEFINED, keyChar);
client.dispatchEvent(keyEvent);
keyChar = text.next();
}
}
} finally {
dispatchingCommittedText = false;
}
}
public int length() {
AttributedCharacterIterator aci = getIterator();
return aci.getEndIndex() - aci.getBeginIndex();
}
/**
* Dispatches committed text to a client component.
* Called by composition window.
*
* @param client The component that the text should get dispatched to.
* @param text The iterator providing access to the committed
* (and possible composed) text.
* @param committedCharacterCount The number of committed characters in the text.
*/
synchronized void dispatchCommittedText(Component client,
AttributedCharacterIterator text,
int committedCharacterCount) {
// note that the client is not always the current client component -
// some host input method adapters may dispatch input method events
// through the Java event queue, and we may have switched clients while
// the event was in the queue.
if (committedCharacterCount == 0
|| text.getEndIndex() <= text.getBeginIndex()) {
return;
}
long time = System.currentTimeMillis();
dispatchingCommittedText = true;
try {
InputMethodRequests req = client.getInputMethodRequests();
if (req != null) {
// active client -> send text as InputMethodEvent
int beginIndex = text.getBeginIndex();
AttributedCharacterIterator toBeCommitted =
(new AttributedString(text, beginIndex, beginIndex + committedCharacterCount)).getIterator();
InputMethodEvent inputEvent = new InputMethodEvent(
client,
InputMethodEvent.INPUT_METHOD_TEXT_CHANGED,
toBeCommitted,
committedCharacterCount,
null, null);
client.dispatchEvent(inputEvent);
} else {
// passive client -> send text as KeyEvents
char keyChar = text.first();
while (committedCharacterCount-- > 0 && keyChar != CharacterIterator.DONE) {
KeyEvent keyEvent = new KeyEvent(client, KeyEvent.KEY_TYPED,
time, 0, KeyEvent.VK_UNDEFINED, keyChar);
client.dispatchEvent(keyEvent);
keyChar = text.next();
}
}
} finally {
dispatchingCommittedText = false;
}
}
/**
* Constructs an {@code InputMethodEvent} with the specified
* source component, type, time, text, caret, and visiblePosition.
* <p>
* The offsets of caret and visiblePosition are relative to the current
* composed text; that is, the composed text within {@code text}
* if this is an {@code INPUT_METHOD_TEXT_CHANGED} event,
* the composed text within the {@code text} of the
* preceding {@code INPUT_METHOD_TEXT_CHANGED} event otherwise.
* <p>Note that passing in an invalid {@code id} results in
* unspecified behavior. This method throws an
* {@code IllegalArgumentException} if {@code source}
* is {@code null}.
*
* @param source the object where the event originated
* @param id the event type
* @param when a long integer that specifies the time the event occurred
* @param text the combined committed and composed text,
* committed text first; must be {@code null}
* when the event type is {@code CARET_POSITION_CHANGED};
* may be {@code null} for
* {@code INPUT_METHOD_TEXT_CHANGED} if there's no
* committed or composed text
* @param committedCharacterCount the number of committed
* characters in the text
* @param caret the caret (a.k.a. insertion point);
* {@code null} if there's no caret within current
* composed text
* @param visiblePosition the position that's most important
* to be visible; {@code null} if there's no
* recommendation for a visible position within current
* composed text
* @throws IllegalArgumentException if {@code id} is not
* in the range
* {@code INPUT_METHOD_FIRST}..{@code INPUT_METHOD_LAST};
* or if id is {@code CARET_POSITION_CHANGED} and
* {@code text} is not {@code null};
* or if {@code committedCharacterCount} is not in the range
* {@code 0}..{@code (text.getEndIndex() - text.getBeginIndex())}
* @throws IllegalArgumentException if {@code source} is null
*
* @since 1.4
*/
public InputMethodEvent(Component source, int id, long when,
AttributedCharacterIterator text, int committedCharacterCount,
TextHitInfo caret, TextHitInfo visiblePosition) {
super(source, id);
if (id < INPUT_METHOD_FIRST || id > INPUT_METHOD_LAST) {
throw new IllegalArgumentException("id outside of valid range");
}
if (id == CARET_POSITION_CHANGED && text != null) {
throw new IllegalArgumentException("text must be null for CARET_POSITION_CHANGED");
}
this.when = when;
this.text = text;
int textLength = 0;
if (text != null) {
textLength = text.getEndIndex() - text.getBeginIndex();
}
if (committedCharacterCount < 0 || committedCharacterCount > textLength) {
throw new IllegalArgumentException("committedCharacterCount outside of valid range");
}
this.committedCharacterCount = committedCharacterCount;
this.caret = caret;
this.visiblePosition = visiblePosition;
}
/**
* Updates this <code>LineBreakMeasurer</code> after a single
* character is inserted into the text, and sets the current
* position to the beginning of the paragraph.
*
* @param newParagraph the text after the insertion
* @param insertPos the position in the text at which the character
* is inserted
* @throws IndexOutOfBoundsException if <code>insertPos</code> is less
* than the start of <code>newParagraph</code> or greater than
* or equal to the end of <code>newParagraph</code>
* @throws NullPointerException if <code>newParagraph</code> is
* <code>null</code>
* @see #deleteChar
*/
public void insertChar(AttributedCharacterIterator newParagraph,
int insertPos) {
measurer.insertChar(newParagraph, insertPos);
limit = newParagraph.getEndIndex();
pos = start = newParagraph.getBeginIndex();
charIter.reset(measurer.getChars(), newParagraph.getBeginIndex());
breakIter.setText(charIter);
}
/**
* Constructs an <code>InputMethodEvent</code> with the specified
* source component, type, time, text, caret, and visiblePosition.
* <p>
* The offsets of caret and visiblePosition are relative to the current
* composed text; that is, the composed text within <code>text</code>
* if this is an <code>INPUT_METHOD_TEXT_CHANGED</code> event,
* the composed text within the <code>text</code> of the
* preceding <code>INPUT_METHOD_TEXT_CHANGED</code> event otherwise.
* <p>Note that passing in an invalid <code>id</code> results in
* unspecified behavior. This method throws an
* <code>IllegalArgumentException</code> if <code>source</code>
* is <code>null</code>.
*
* @param source the object where the event originated
* @param id the event type
* @param when a long integer that specifies the time the event occurred
* @param text the combined committed and composed text,
* committed text first; must be <code>null</code>
* when the event type is <code>CARET_POSITION_CHANGED</code>;
* may be <code>null</code> for
* <code>INPUT_METHOD_TEXT_CHANGED</code> if there's no
* committed or composed text
* @param committedCharacterCount the number of committed
* characters in the text
* @param caret the caret (a.k.a. insertion point);
* <code>null</code> if there's no caret within current
* composed text
* @param visiblePosition the position that's most important
* to be visible; <code>null</code> if there's no
* recommendation for a visible position within current
* composed text
* @throws IllegalArgumentException if <code>id</code> is not
* in the range
* <code>INPUT_METHOD_FIRST</code>..<code>INPUT_METHOD_LAST</code>;
* or if id is <code>CARET_POSITION_CHANGED</code> and
* <code>text</code> is not <code>null</code>;
* or if <code>committedCharacterCount</code> is not in the range
* <code>0</code>..<code>(text.getEndIndex() - text.getBeginIndex())</code>
* @throws IllegalArgumentException if <code>source</code> is null
*
* @since 1.4
*/
public InputMethodEvent(Component source, int id, long when,
AttributedCharacterIterator text, int committedCharacterCount,
TextHitInfo caret, TextHitInfo visiblePosition) {
super(source, id);
if (id < INPUT_METHOD_FIRST || id > INPUT_METHOD_LAST) {
throw new IllegalArgumentException("id outside of valid range");
}
if (id == CARET_POSITION_CHANGED && text != null) {
throw new IllegalArgumentException("text must be null for CARET_POSITION_CHANGED");
}
this.when = when;
this.text = text;
int textLength = 0;
if (text != null) {
textLength = text.getEndIndex() - text.getBeginIndex();
}
if (committedCharacterCount < 0 || committedCharacterCount > textLength) {
throw new IllegalArgumentException("committedCharacterCount outside of valid range");
}
this.committedCharacterCount = committedCharacterCount;
this.caret = caret;
this.visiblePosition = visiblePosition;
}
/**
* Updates this <code>LineBreakMeasurer</code> after a single
* character is inserted into the text, and sets the current
* position to the beginning of the paragraph.
*
* @param newParagraph the text after the insertion
* @param insertPos the position in the text at which the character
* is inserted
* @throws IndexOutOfBoundsException if <code>insertPos</code> is less
* than the start of <code>newParagraph</code> or greater than
* or equal to the end of <code>newParagraph</code>
* @throws NullPointerException if <code>newParagraph</code> is
* <code>null</code>
* @see #deleteChar
*/
public void insertChar(AttributedCharacterIterator newParagraph,
int insertPos) {
measurer.insertChar(newParagraph, insertPos);
limit = newParagraph.getEndIndex();
pos = start = newParagraph.getBeginIndex();
charIter.reset(measurer.getChars(), newParagraph.getBeginIndex());
breakIter.setText(charIter);
}