/**
* 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 inserting a single character
* at insertPos.
* @param chars the characters in aci
* @param insertPos the index of the new character in aci
* @param oldParagraph a StyledParagraph for the text in aci before the insertion
*/
public static StyledParagraph insertChar(
AttributedCharacterIterator aci, char[] chars, int insertPos, StyledParagraph oldParagraph) {
// If the styles at insertPos match those at insertPos-1,
// oldParagraph will be reused. Otherwise we create a new
// paragraph.
char ch = aci.setIndex(insertPos);
int relativePos = Math.max(insertPos - aci.getBeginIndex() - 1, 0);
Map attributes = addInputMethodAttrs(aci.getAttributes());
Decoration d = Decoration.getDecoration(attributes);
if (!oldParagraph.getDecorationAt(relativePos).equals(d)) {
return new StyledParagraph(aci, chars);
}
Object f = getGraphicOrFont(attributes);
if (f == null) {
FontResolver resolver = FontResolver.getInstance();
int fontIndex = resolver.getFontIndex(ch);
f = resolver.getFont(fontIndex, attributes);
}
if (!oldParagraph.getFontOrGraphicAt(relativePos).equals(f)) {
return new StyledParagraph(aci, chars);
}
// insert into existing paragraph
oldParagraph.length += 1;
if (oldParagraph.decorations != null) {
insertInto(relativePos, oldParagraph.decorationStarts, oldParagraph.decorations.size());
}
if (oldParagraph.fonts != null) {
insertInto(relativePos, oldParagraph.fontStarts, oldParagraph.fonts.size());
}
return oldParagraph;
}
/** Resolve the given chars into Fonts using FontResolver, then add font runs for each. */
private void addFonts(char[] chars, Map attributes, int start, int limit) {
FontResolver resolver = FontResolver.getInstance();
CodePointIterator iter = CodePointIterator.create(chars, start, limit);
for (int runStart = iter.charIndex(); runStart < limit; runStart = iter.charIndex()) {
int fontIndex = resolver.nextFontRunIndex(iter);
addFont(resolver.getFont(fontIndex, attributes), runStart);
}
}