diff options
| -rw-r--r-- | core/java/android/text/Selection.java | 3 | ||||
| -rw-r--r-- | core/java/android/text/method/ArrowKeyMovementMethod.java | 105 | ||||
| -rw-r--r-- | core/java/android/text/method/WordIterator.java | 220 |
3 files changed, 220 insertions, 108 deletions
diff --git a/core/java/android/text/Selection.java b/core/java/android/text/Selection.java index b18570a..679e2cc 100644 --- a/core/java/android/text/Selection.java +++ b/core/java/android/text/Selection.java @@ -16,10 +16,7 @@ package android.text; -import android.util.Log; - import java.text.BreakIterator; -import java.text.CharacterIterator; /** diff --git a/core/java/android/text/method/ArrowKeyMovementMethod.java b/core/java/android/text/method/ArrowKeyMovementMethod.java index b25ba8d..d432dee 100644 --- a/core/java/android/text/method/ArrowKeyMovementMethod.java +++ b/core/java/android/text/method/ArrowKeyMovementMethod.java @@ -17,23 +17,14 @@ package android.text.method; import android.graphics.Rect; -import android.text.CharSequenceIterator; -import android.text.Editable; import android.text.Layout; import android.text.Selection; import android.text.Spannable; -import android.text.Spanned; -import android.text.TextWatcher; -import android.util.Log; -import android.util.MathUtils; import android.view.KeyEvent; import android.view.MotionEvent; import android.view.View; import android.widget.TextView; -import java.text.BreakIterator; -import java.text.CharacterIterator; - /** * A movement method that provides cursor movement and selection. * Supports displaying the context menu on DPad Center. @@ -332,102 +323,6 @@ public class ArrowKeyMovementMethod extends BaseMovementMethod implements Moveme return sInstance; } - /** - * Walks through cursor positions at word boundaries. Internally uses - * {@link BreakIterator#getWordInstance()}, and caches {@link CharSequence} - * for performance reasons. - */ - private static class WordIterator implements Selection.PositionIterator { - private CharSequence mCurrent; - private boolean mCurrentDirty = false; - - private BreakIterator mIterator; - - private TextWatcher mWatcher = new TextWatcher() { - /** {@inheritDoc} */ - public void beforeTextChanged(CharSequence s, int start, int count, int after) { - // ignored - } - - /** {@inheritDoc} */ - public void onTextChanged(CharSequence s, int start, int before, int count) { - mCurrentDirty = true; - } - - /** {@inheritDoc} */ - public void afterTextChanged(Editable s) { - // ignored - } - }; - - public void setCharSequence(CharSequence incoming) { - if (mIterator == null) { - mIterator = BreakIterator.getWordInstance(); - } - - // when incoming is different object, move listeners to new sequence - // and mark as dirty so we reload contents. - if (mCurrent != incoming) { - if (mCurrent instanceof Editable) { - ((Editable) mCurrent).removeSpan(mWatcher); - } - - if (incoming instanceof Editable) { - ((Editable) incoming).setSpan( - mWatcher, 0, incoming.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE); - } - - mCurrent = incoming; - mCurrentDirty = true; - } - - if (mCurrentDirty) { - final CharacterIterator charIterator = new CharSequenceIterator(mCurrent); - mIterator.setText(charIterator); - - mCurrentDirty = false; - } - } - - private boolean isValidOffset(int offset) { - return offset >= 0 && offset <= mCurrent.length(); - } - - private boolean isLetterOrDigit(int offset) { - if (isValidOffset(offset)) { - return Character.isLetterOrDigit(mCurrent.charAt(offset)); - } else { - return false; - } - } - - /** {@inheritDoc} */ - public int preceding(int offset) { - // always round cursor index into valid string index - offset = MathUtils.constrain(offset, 0, mCurrent.length()); - - do { - offset = mIterator.preceding(offset); - if (isLetterOrDigit(offset)) break; - } while (isValidOffset(offset)); - - return offset; - } - - /** {@inheritDoc} */ - public int following(int offset) { - // always round cursor index into valid string index - offset = MathUtils.constrain(offset, 0, mCurrent.length()); - - do { - offset = mIterator.following(offset); - if (isLetterOrDigit(offset - 1)) break; - } while (isValidOffset(offset)); - - return offset; - } - } - private WordIterator mWordIterator = new WordIterator(); private static final Object LAST_TAP_DOWN = new Object(); diff --git a/core/java/android/text/method/WordIterator.java b/core/java/android/text/method/WordIterator.java new file mode 100644 index 0000000..b250414 --- /dev/null +++ b/core/java/android/text/method/WordIterator.java @@ -0,0 +1,220 @@ + +/* + * Copyright (C) 2011 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.method; + +import android.text.CharSequenceIterator; +import android.text.Editable; +import android.text.Selection; +import android.text.Spanned; +import android.text.TextWatcher; + +import java.text.BreakIterator; +import java.text.CharacterIterator; +import java.util.Locale; + +/** + * Walks through cursor positions at word boundaries. Internally uses + * {@link BreakIterator#getWordInstance()}, and caches {@link CharSequence} + * for performance reasons. + * + * Also provides methods to determine word boundaries. + * {@hide} + */ +public class WordIterator implements Selection.PositionIterator { + private CharSequence mCurrent; + private boolean mCurrentDirty = false; + + private BreakIterator mIterator; + + /** + * Constructs a WordIterator using the default locale. + */ + public WordIterator() { + this(Locale.getDefault()); + } + + /** + * Constructs a new WordIterator for the specified locale. + * @param locale The locale to be used when analysing the text. + */ + public WordIterator(Locale locale) { + mIterator = BreakIterator.getWordInstance(locale); + } + + private final TextWatcher mWatcher = new TextWatcher() { + /** {@inheritDoc} */ + public void beforeTextChanged(CharSequence s, int start, int count, int after) { + // ignored + } + + /** {@inheritDoc} */ + public void onTextChanged(CharSequence s, int start, int before, int count) { + mCurrentDirty = true; + } + + /** {@inheritDoc} */ + public void afterTextChanged(Editable s) { + // ignored + } + }; + + public void setCharSequence(CharSequence incoming) { + // When incoming is different object, move listeners to new sequence + // and mark as dirty so we reload contents. + if (mCurrent != incoming) { + if (mCurrent instanceof Editable) { + ((Editable) mCurrent).removeSpan(mWatcher); + } + + if (incoming instanceof Editable) { + ((Editable) incoming).setSpan( + mWatcher, 0, incoming.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE); + } + + mCurrent = incoming; + mCurrentDirty = true; + } + + if (mCurrentDirty) { + final CharacterIterator charIterator = new CharSequenceIterator(mCurrent); + mIterator.setText(charIterator); + + mCurrentDirty = false; + } + } + + /** {@inheritDoc} */ + public int preceding(int offset) { + do { + offset = mIterator.preceding(offset); + if (offset == BreakIterator.DONE || isOnLetterOrDigit(offset)) { + break; + } + } while (true); + + return offset; + } + + /** {@inheritDoc} */ + public int following(int offset) { + do { + offset = mIterator.following(offset); + if (offset == BreakIterator.DONE || isAfterLetterOrDigit(offset)) { + break; + } + } while (true); + + return offset; + } + + /** If <code>offset</code> is within a word, returns the index of the first character of that + * word, otherwise returns BreakIterator.DONE. + * + * The offsets that are considered to be part of a word are the indexes of its characters, + * <i>as well as</i> the index of its last character plus one. + * If offset is the index of a low surrogate character, BreakIterator.DONE will be returned. + * + * Valid range for offset is [0..textLength] (note the inclusive upper bound). + * The returned value is within [0..offset] or BreakIterator.DONE. + * + * @throws IllegalArgumentException is offset is not valid. + */ + public int getBeginning(int offset) { + checkOffsetIsValid(offset); + + if (isOnLetterOrDigit(offset)) { + if (mIterator.isBoundary(offset)) { + return offset; + } else { + return mIterator.preceding(offset); + } + } else { + if (isAfterLetterOrDigit(offset)) { + return mIterator.preceding(offset); + } + } + return BreakIterator.DONE; + } + + /** If <code>offset</code> is within a word, returns the index of the last character of that + * word plus one, otherwise returns BreakIterator.DONE. + * + * The offsets that are considered to be part of a word are the indexes of its characters, + * <i>as well as</i> the index of its last character plus one. + * If offset is the index of a low surrogate character, BreakIterator.DONE will be returned. + * + * Valid range for offset is [0..textLength] (note the inclusive upper bound). + * The returned value is within [offset..textLength] or BreakIterator.DONE. + * + * @throws IllegalArgumentException is offset is not valid. + */ + public int getEnd(int offset) { + checkOffsetIsValid(offset); + + if (isAfterLetterOrDigit(offset)) { + if (mIterator.isBoundary(offset)) { + return offset; + } else { + return mIterator.following(offset); + } + } else { + if (isOnLetterOrDigit(offset)) { + return mIterator.following(offset); + } + } + return BreakIterator.DONE; + } + + private boolean isAfterLetterOrDigit(int offset) { + if (offset - 1 >= 0) { + final char previousChar = mCurrent.charAt(offset - 1); + if (Character.isLetterOrDigit(previousChar)) return true; + if (offset - 2 >= 0) { + final char previousPreviousChar = mCurrent.charAt(offset - 2); + if (Character.isSurrogatePair(previousPreviousChar, previousChar)) { + final int codePoint = Character.toCodePoint(previousPreviousChar, previousChar); + return Character.isLetterOrDigit(codePoint); + } + } + } + return false; + } + + private boolean isOnLetterOrDigit(int offset) { + final int length = mCurrent.length(); + if (offset < length) { + final char currentChar = mCurrent.charAt(offset); + if (Character.isLetterOrDigit(currentChar)) return true; + if (offset + 1 < length) { + final char nextChar = mCurrent.charAt(offset + 1); + if (Character.isSurrogatePair(currentChar, nextChar)) { + final int codePoint = Character.toCodePoint(currentChar, nextChar); + return Character.isLetterOrDigit(codePoint); + } + } + } + return false; + } + + private void checkOffsetIsValid(int offset) { + if (offset < 0 || offset > mCurrent.length()) { + final String message = "Valid range is [0, " + mCurrent.length() + "]"; + throw new IllegalArgumentException(message); + } + } +} |