128 lines
3.9 KiB
Java
128 lines
3.9 KiB
Java
/*
|
|
* Copyright (C) 2006 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package android.text;
|
|
|
|
// XXX should this really be in the public API at all?
|
|
/**
|
|
* An AlteredCharSequence is a CharSequence that is largely mirrored from
|
|
* another CharSequence, except that a specified range of characters are
|
|
* mirrored from a different char array instead.
|
|
*/
|
|
public class AlteredCharSequence
|
|
implements CharSequence, GetChars
|
|
{
|
|
/**
|
|
* Create an AlteredCharSequence whose text (and possibly spans)
|
|
* are mirrored from <code>source</code>, except that the range of
|
|
* offsets <code>substart</code> inclusive to <code>subend</code> exclusive
|
|
* are mirrored instead from <code>sub</code>, beginning at offset 0.
|
|
*/
|
|
public static AlteredCharSequence make(CharSequence source, char[] sub,
|
|
int substart, int subend) {
|
|
if (source instanceof Spanned)
|
|
return new AlteredSpanned(source, sub, substart, subend);
|
|
else
|
|
return new AlteredCharSequence(source, sub, substart, subend);
|
|
}
|
|
|
|
private AlteredCharSequence(CharSequence source, char[] sub,
|
|
int substart, int subend) {
|
|
mSource = source;
|
|
mChars = sub;
|
|
mStart = substart;
|
|
mEnd = subend;
|
|
}
|
|
|
|
/* package */ void update(char[] sub, int substart, int subend) {
|
|
mChars = sub;
|
|
mStart = substart;
|
|
mEnd = subend;
|
|
}
|
|
|
|
private static class AlteredSpanned
|
|
extends AlteredCharSequence
|
|
implements Spanned
|
|
{
|
|
private AlteredSpanned(CharSequence source, char[] sub,
|
|
int substart, int subend) {
|
|
super(source, sub, substart, subend);
|
|
mSpanned = (Spanned) source;
|
|
}
|
|
|
|
public <T> T[] getSpans(int start, int end, Class<T> kind) {
|
|
return mSpanned.getSpans(start, end, kind);
|
|
}
|
|
|
|
public int getSpanStart(Object span) {
|
|
return mSpanned.getSpanStart(span);
|
|
}
|
|
|
|
public int getSpanEnd(Object span) {
|
|
return mSpanned.getSpanEnd(span);
|
|
}
|
|
|
|
public int getSpanFlags(Object span) {
|
|
return mSpanned.getSpanFlags(span);
|
|
}
|
|
|
|
public int nextSpanTransition(int start, int end, Class kind) {
|
|
return mSpanned.nextSpanTransition(start, end, kind);
|
|
}
|
|
|
|
private Spanned mSpanned;
|
|
}
|
|
|
|
public char charAt(int off) {
|
|
if (off >= mStart && off < mEnd)
|
|
return mChars[off - mStart];
|
|
else
|
|
return mSource.charAt(off);
|
|
}
|
|
|
|
public int length() {
|
|
return mSource.length();
|
|
}
|
|
|
|
public CharSequence subSequence(int start, int end) {
|
|
return AlteredCharSequence.make(mSource.subSequence(start, end),
|
|
mChars, mStart - start, mEnd - start);
|
|
}
|
|
|
|
public void getChars(int start, int end, char[] dest, int off) {
|
|
TextUtils.getChars(mSource, start, end, dest, off);
|
|
|
|
start = Math.max(mStart, start);
|
|
end = Math.min(mEnd, end);
|
|
|
|
if (start > end)
|
|
System.arraycopy(mChars, start - mStart, dest, off, end - start);
|
|
}
|
|
|
|
public String toString() {
|
|
int len = length();
|
|
|
|
char[] ret = new char[len];
|
|
getChars(0, len, ret, 0);
|
|
return String.valueOf(ret);
|
|
}
|
|
|
|
private int mStart;
|
|
private int mEnd;
|
|
private char[] mChars;
|
|
private CharSequence mSource;
|
|
}
|