JDK14/Java14源码在线阅读
/*
* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
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/*
* (C) Copyright IBM Corp. 1999, All rights reserved.
*/
package java.awt.font;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.im.InputMethodHighlight;
import java.text.Annotation;
import java.text.AttributedCharacterIterator;
import java.text.AttributedCharacterIterator.Attribute;
import java.util.Vector;
import java.util.HashMap;
import java.util.Map;
import sun.font.CodePointIterator;
import sun.font.Decoration;
import sun.font.FontResolver;
/**
* This class stores Font, GraphicAttribute, and Decoration intervals
* on a paragraph of styled text.
* <p>
* Currently, this class is optimized for a small number of intervals
* (preferably 1).
*/
final class StyledParagraph {
// the length of the paragraph
private int length;
// If there is a single Decoration for the whole paragraph, it
// is stored here. Otherwise this field is ignored.
private Decoration decoration;
// If there is a single Font or GraphicAttribute for the whole
// paragraph, it is stored here. Otherwise this field is ignored.
private Object font;
// If there are multiple Decorations in the paragraph, they are
// stored in this Vector, in order. Otherwise this vector and
// the decorationStarts array are null.
private Vector<Decoration> decorations;
// If there are multiple Decorations in the paragraph,
// decorationStarts[i] contains the index where decoration i
// starts. For convenience, there is an extra entry at the
// end of this array with the length of the paragraph.
int[] decorationStarts;
// If there are multiple Fonts/GraphicAttributes in the paragraph,
// they are
// stored in this Vector, in order. Otherwise this vector and
// the fontStarts array are null.
private Vector<Object> fonts;
// If there are multiple Fonts/GraphicAttributes in the paragraph,
// fontStarts[i] contains the index where decoration i
// starts. For convenience, there is an extra entry at the
// end of this array with the length of the paragraph.
int[] fontStarts;
private static int INITIAL_SIZE = 8;
/**
* Create a new StyledParagraph over the given styled text.
* @param aci an iterator over the text
* @param chars the characters extracted from aci
*/
public StyledParagraph(AttributedCharacterIterator aci,
char[] chars) {
int start = aci.getBeginIndex();
int end = aci.getEndIndex();
length = end - start;
int index = start;
aci.first();
do {
final int nextRunStart = aci.getRunLimit();
final int localIndex = index-start;
Map<? extends Attribute, ?> attributes = aci.getAttributes();
attributes = addInputMethodAttrs(attributes);
Decoration d = Decoration.getDecoration(attributes);
addDecoration(d, localIndex);
Object f = getGraphicOrFont(attributes);
if (f == null) {
addFonts(chars, attributes, localIndex, nextRunStart-start);
}
else {
addFont(f, localIndex);
}
aci.setIndex(nextRunStart);
index = nextRunStart;
} while (index < end);
// Add extra entries to starts arrays with the length
// of the paragraph. 'this' is used as a dummy value
// in the Vector.
if (decorations != null) {
decorationStarts = addToVector(this, length, decorations, decorationStarts);
}
if (fonts != null) {
fontStarts = addToVector(this, length, fonts, fontStarts);
}
}
/**
* Adjust indices in starts to reflect an insertion after pos.
* Any index in starts greater than pos will be increased by 1.
*/
private static void insertInto(int pos, int[] starts, int numStarts) {
while (starts[--numStarts] > pos) {
starts[numStarts] += 1;
}
}
/**
* 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<? extends Attribute, ?> 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;
}
/**
* Adjust indices in starts to reflect a deletion after deleteAt.
* Any index in starts greater than deleteAt will be increased by 1.
* It is the caller's responsibility to make sure that no 0-length
* runs result.
*/
private static void deleteFrom(int deleteAt, int[] starts, int numStarts) {
while (starts[--numStarts] > deleteAt) {
starts[numStarts] -= 1;
}
}
/**
* 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 the index at which there is a different Font, GraphicAttribute, or
* Decoration than at the given index.
* @param index a valid index in the paragraph
* @return the first index where there is a change in attributes from
* those at index
*/
public int getRunLimit(int index) {
if (index < 0 || index >= length) {
throw new IllegalArgumentException("index out of range");
}
int limit1 = length;
if (decorations != null) {
int run = findRunContaining(index, decorationStarts);
limit1 = decorationStarts[run+1];
}
int limit2 = length;
if (fonts != null) {
int run = findRunContaining(index, fontStarts);
limit2 = fontStarts[run+1];
}
return Math.min(limit1, limit2);
}
/**
* Return the Decoration in effect at the given index.
* @param index a valid index in the paragraph
* @return the Decoration at index.
*/
public Decoration getDecorationAt(int index) {
if (index < 0 || index >= length) {
throw new IllegalArgumentException("index out of range");
}
if (decorations == null) {
return decoration;
}
int run = findRunContaining(index, decorationStarts);
return decorations.elementAt(run);
}
/**
* Return the Font or GraphicAttribute in effect at the given index.
* The client must test the type of the return value to determine what
* it is.
* @param index a valid index in the paragraph
* @return the Font or GraphicAttribute at index.
*/
public Object getFontOrGraphicAt(int index) {
if (index < 0 || index >= length) {
throw new IllegalArgumentException("index out of range");
}
if (fonts == null) {
return font;
}
int run = findRunContaining(index, fontStarts);
return fonts.elementAt(run);
}
/**
* Return i such that starts[i] <= index < starts[i+1]. starts
* must be in increasing order, with at least one element greater
* than index.
*/
private static int findRunContaining(int index, int[] starts) {
for (int i=1; true; i++) {
if (starts[i] > index) {
return i-1;
}
}
}
/**
* Append the given Object to the given Vector. Add
* the given index to the given starts array. If the
* starts array does not have room for the index, a
* new array is created and returned.
*/
@SuppressWarnings({"rawtypes", "unchecked"})
private static int[] addToVector(Object obj,
int index,
Vector v,
int[] starts) {
if (!v.lastElement().equals(obj)) {
v.addElement(obj);
int count = v.size();
if (starts.length == count) {
int[] temp = new int[starts.length*2];
System.arraycopy(starts, 0, temp, 0, starts.length);
starts = temp;
}
starts[count-1] = index;
}
return starts;
}
/**
* Add a new Decoration run with the given Decoration at the
* given index.
*/
private void addDecoration(Decoration d, int index) {
if (decorations != null) {
decorationStarts = addToVector(d,
index,
decorations,
decorationStarts);
}
else if (decoration == null) {
decoration = d;
}
else {
if (!decoration.equals(d)) {
decorations = new Vector<Decoration>(INITIAL_SIZE);
decorations.addElement(decoration);
decorations.addElement(d);
decorationStarts = new int[INITIAL_SIZE];
decorationStarts[0] = 0;
decorationStarts[1] = index;
}
}
}
/**
* Add a new Font/GraphicAttribute run with the given object at the
* given index.
*/
private void addFont(Object f, int index) {
if (fonts != null) {
fontStarts = addToVector(f, index, fonts, fontStarts);
}
else if (font == null) {
font = f;
}
else {
if (!font.equals(f)) {
fonts = new Vector<Object>(INITIAL_SIZE);
fonts.addElement(font);
fonts.addElement(f);
fontStarts = new int[INITIAL_SIZE];
fontStarts[0] = 0;
fontStarts[1] = index;
}
}
}
/**
* Resolve the given chars into Fonts using FontResolver, then add
* font runs for each.
*/
private void addFonts(char[] chars, Map<? extends Attribute, ?> 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);
}
}
/**
* Return a Map with entries from oldStyles, as well as input
* method entries, if any.
*/
static Map<? extends Attribute, ?>
addInputMethodAttrs(Map<? extends Attribute, ?> oldStyles) {
Object value = oldStyles.get(TextAttribute.INPUT_METHOD_HIGHLIGHT);
try {
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