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Make Latin IME aware of its surrounding text.

Browse source 
This is a preparatory change for
Bug: 4967874
Bug: 6617760
Bug: 6950087

Change-Id: I3abf8e45c0d02c42491421f108370220134b9602
This commit is contained in:
Jean Chalard 2012-09-10 19:27:45 +09:00
parent 2935276110
commit 28d765ed90
2 changed files with 203 additions and 9 deletions
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33
java/src/com/android/inputmethod/latin/LatinIME.java
View file

@ -733,6 +733,8 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
mainKeyboardView.setGesturePreviewMode(mCurrentSettings.mGesturePreviewTrailEnabled,
mCurrentSettings.mGestureFloatingPreviewTextEnabled);
mConnection.resetCachesUponCursorMove(mLastSelectionStart);
if (TRACE) Debug.startMethodTracing("/data/trace/latinime");
}
@ -839,7 +841,7 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
mSpaceState = SPACE_STATE_NONE;
if ((!mWordComposer.isComposingWord()) || selectionChanged || noComposingSpan) {
resetEntireInputState();
resetEntireInputState(newSelStart);
}
mHandler.postUpdateShiftState();
@ -1043,14 +1045,14 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
// This will reset the whole input state to the starting state. It will clear
// the composing word, reset the last composed word, tell the inputconnection about it.
private void resetEntireInputState() {
private void resetEntireInputState(final int newCursorPosition) {
resetComposingState(true /* alsoResetLastComposedWord */);
if (mCurrentSettings.mBigramPredictionEnabled) {
clearSuggestionStrip();
} else {
setSuggestionStrip(mCurrentSettings.mSuggestPuncList, false);
}
mConnection.finishComposingText();
mConnection.resetCachesUponCursorMove(newCursorPosition);
}
private void resetComposingState(final boolean alsoResetLastComposedWord) {
@ -1220,7 +1222,7 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
}
}
private void sendUpDownEnterOrBackspace(final int code) {
private void sendDownUpKeyEventForBackwardCompatibility(final int code) {
final long eventTime = SystemClock.uptimeMillis();
mConnection.sendKeyEvent(new KeyEvent(eventTime, eventTime,
KeyEvent.ACTION_DOWN, code, 0, 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
@ -1234,7 +1236,7 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
// TODO: Remove this special handling of digit letters.
// For backward compatibility. See {@link InputMethodService#sendKeyChar(char)}.
if (code >= '0' && code <= '9') {
super.sendKeyChar((char)code);
sendDownUpKeyEventForBackwardCompatibility(code - '0' + KeyEvent.KEYCODE_0);
if (ProductionFlag.IS_EXPERIMENTAL) {
ResearchLogger.latinIME_sendKeyCodePoint(code);
}
@ -1249,7 +1251,7 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
// a hardware keyboard event on pressing enter or delete. This is bad for many
// reasons (there are race conditions with commits) but some applications are
// relying on this behavior so we continue to support it for older apps.
sendUpDownEnterOrBackspace(KeyEvent.KEYCODE_ENTER);
sendDownUpKeyEventForBackwardCompatibility(KeyEvent.KEYCODE_ENTER);
} else {
final String text = new String(new int[] { code }, 0, 1);
mConnection.commitText(text, text.length());
@ -1525,7 +1527,7 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
// a hardware keyboard event on pressing enter or delete. This is bad for many
// reasons (there are race conditions with commits) but some applications are
// relying on this behavior so we continue to support it for older apps.
sendUpDownEnterOrBackspace(KeyEvent.KEYCODE_DEL);
sendDownUpKeyEventForBackwardCompatibility(KeyEvent.KEYCODE_DEL);
} else {
mConnection.deleteSurroundingText(1, 0);
}
@ -1862,7 +1864,11 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
separatorString);
if (!typedWord.equals(autoCorrection)) {
// This will make the correction flash for a short while as a visual clue
// to the user that auto-correction happened.
// to the user that auto-correction happened. It has no other effect; in particular
// note that this won't affect the text inside the text field AT ALL: it only makes
// the segment of text starting at the supplied index and running for the length
// of the auto-correction flash. At this moment, the "typedWord" argument is
// ignored by TextView.
mConnection.commitCorrection(
new CorrectionInfo(mLastSelectionEnd - typedWord.length(),
typedWord, autoCorrection));
@ -2229,6 +2235,17 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
dialog.show();
}
public void debugDumpStateAndCrashWithException(final String context) {
final StringBuilder s = new StringBuilder();
s.append("Target application : ").append(mTargetApplicationInfo.name)
.append("\nPackage : ").append(mTargetApplicationInfo.packageName)
.append("\nTarget app sdk version : ")
.append(mTargetApplicationInfo.targetSdkVersion)
.append("\nAttributes : ").append(mCurrentSettings.getInputAttributesDebugString())
.append("\nContext : ").append(context);
throw new RuntimeException(s.toString());
}
@Override
protected void dump(FileDescriptor fd, PrintWriter fout, String[] args) {
super.dump(fd, fout, args);

179
java/src/com/android/inputmethod/latin/RichInputConnection.java
View file

@ -33,16 +33,47 @@ import com.android.inputmethod.research.ResearchLogger;
import java.util.regex.Pattern;
/**
* Wrapper for InputConnection to simplify interaction
* Enrichment class for InputConnection to simplify interaction and add functionality.
*
* This class serves as a wrapper to be able to simply add hooks to any calls to the underlying
* InputConnection. It also keeps track of a number of things to avoid having to call upon IPC
* all the time to find out what text is in the buffer, when we need it to determine caps mode
* for example.
*/
public class RichInputConnection {
private static final String TAG = RichInputConnection.class.getSimpleName();
private static final boolean DBG = false;
private static final boolean DEBUG_PREVIOUS_TEXT = false;
// Provision for a long word pair and a separator
private static final int LOOKBACK_CHARACTER_NUM = BinaryDictionary.MAX_WORD_LENGTH * 2 + 1;
private static final Pattern spaceRegex = Pattern.compile("\\s+");
private static final int INVALID_CURSOR_POSITION = -1;
/**
* This variable contains the value LatinIME thinks the cursor position should be at now.
* This is a few steps in advance of what the TextView thinks it is, because TextView will
* only know after the IPC calls gets through.
*/
private int mCurrentCursorPosition = INVALID_CURSOR_POSITION; // in chars, not code points
/**
* This contains the committed text immediately preceding the cursor and the composing
* text if any. It is refreshed when the cursor moves by calling upon the TextView.
*/
private StringBuilder mCommittedTextBeforeComposingText = new StringBuilder();
/**
* This contains the currently composing text, as LatinIME thinks the TextView is seeing it.
*/
private StringBuilder mComposingText = new StringBuilder();
/**
* This is a one-character string containing the character after the cursor. Since LatinIME
* never touches it directly, it's never modified by any means other than re-reading from the
* TextView when the cursor position is changed by the user.
*/
private CharSequence mCharAfterTheCursor = "";
// A hint on how many characters to cache from the TextView. A good value of this is given by
// how many characters we need to be able to almost always find the caps mode.
private static final int DEFAULT_TEXT_CACHE_SIZE = 100;
private final InputMethodService mParent;
InputConnection mIC;
int mNestLevel;
@ -52,6 +83,37 @@ public class RichInputConnection {
mNestLevel = 0;
}
private void checkConsistencyForDebug() {
final ExtractedTextRequest r = new ExtractedTextRequest();
r.hintMaxChars = 0;
r.hintMaxLines = 0;
r.token = 1;
r.flags = 0;
final ExtractedText et = mIC.getExtractedText(r, 0);
final CharSequence beforeCursor = getTextBeforeCursor(DEFAULT_TEXT_CACHE_SIZE, 0);
final StringBuilder internal = new StringBuilder().append(mCommittedTextBeforeComposingText)
.append(mComposingText);
if (null == et || null == beforeCursor) return;
final int actualLength = Math.min(beforeCursor.length(), internal.length());
if (internal.length() > actualLength) {
internal.delete(0, internal.length() - actualLength);
}
final String reference = (beforeCursor.length() <= actualLength) ? beforeCursor.toString()
: beforeCursor.subSequence(beforeCursor.length() - actualLength,
beforeCursor.length()).toString();
if (et.selectionStart != mCurrentCursorPosition
|| !(reference.equals(internal.toString()))) {
final String context = "Expected cursor position = " + mCurrentCursorPosition
+ "\nActual cursor position = " + et.selectionStart
+ "\nExpected text = " + internal.length() + " " + internal
+ "\nActual text = " + reference.length() + " " + reference;
((LatinIME)mParent).debugDumpStateAndCrashWithException(context);
} else {
Log.e(TAG, Utils.getStackTrace(2));
Log.e(TAG, "Exp <> Actual : " + mCurrentCursorPosition + " <> " + et.selectionStart);
}
}
public void beginBatchEdit() {
if (++mNestLevel == 1) {
mIC = mParent.getCurrentInputConnection();
@ -65,12 +127,30 @@ public class RichInputConnection {
Log.e(TAG, "Nest level too deep : " + mNestLevel);
}
}
checkBatchEdit();
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
}
public void endBatchEdit() {
if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
if (--mNestLevel == 0 && null != mIC) {
mIC.endBatchEdit();
}
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
}
public void resetCachesUponCursorMove(final int newCursorPosition) {
mCurrentCursorPosition = newCursorPosition;
mComposingText.setLength(0);
mCommittedTextBeforeComposingText.setLength(0);
mCommittedTextBeforeComposingText.append(getTextBeforeCursor(DEFAULT_TEXT_CACHE_SIZE, 0));
mCharAfterTheCursor = getTextAfterCursor(1, 0);
if (null != mIC) {
mIC.finishComposingText();
if (ProductionFlag.IS_EXPERIMENTAL) {
ResearchLogger.richInputConnection_finishComposingText();
}
}
}
private void checkBatchEdit() {
@ -83,6 +163,10 @@ public class RichInputConnection {
public void finishComposingText() {
checkBatchEdit();
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
mCommittedTextBeforeComposingText.append(mComposingText);
mCurrentCursorPosition += mComposingText.length();
mComposingText.setLength(0);
if (null != mIC) {
mIC.finishComposingText();
if (ProductionFlag.IS_EXPERIMENTAL) {
@ -93,6 +177,10 @@ public class RichInputConnection {
public void commitText(final CharSequence text, final int i) {
checkBatchEdit();
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
mCommittedTextBeforeComposingText.append(text);
mCurrentCursorPosition += text.length() - mComposingText.length();
mComposingText.setLength(0);
if (null != mIC) {
mIC.commitText(text, i);
if (ProductionFlag.IS_EXPERIMENTAL) {
@ -121,12 +209,28 @@ public class RichInputConnection {
public void deleteSurroundingText(final int i, final int j) {
checkBatchEdit();
final int remainingChars = mComposingText.length() - i;
if (remainingChars >= 0) {
mComposingText.setLength(remainingChars);
} else {
mComposingText.setLength(0);
// Never cut under 0
final int len = Math.max(mCommittedTextBeforeComposingText.length()
+ remainingChars, 0);
mCommittedTextBeforeComposingText.setLength(len);
}
if (mCurrentCursorPosition > i) {
mCurrentCursorPosition -= i;
} else {
mCurrentCursorPosition = 0;
}
if (null != mIC) {
mIC.deleteSurroundingText(i, j);
if (ProductionFlag.IS_EXPERIMENTAL) {
ResearchLogger.richInputConnection_deleteSurroundingText(i, j);
}
}
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
}
public void performEditorAction(final int actionId) {
@ -141,6 +245,44 @@ public class RichInputConnection {
public void sendKeyEvent(final KeyEvent keyEvent) {
checkBatchEdit();
if (keyEvent.getAction() == KeyEvent.ACTION_DOWN) {
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
// This method is only called for enter or backspace when speaking to old
// applications (target SDK <= 15), or for digits.
// When talking to new applications we never use this method because it's inherently
// racy and has unpredictable results, but for backward compatibility we continue
// sending the key events for only Enter and Backspace because some applications
// mistakenly catch them to do some stuff.
switch (keyEvent.getKeyCode()) {
case KeyEvent.KEYCODE_ENTER:
mCommittedTextBeforeComposingText.append("\n");
mCurrentCursorPosition += 1;
break;
case KeyEvent.KEYCODE_DEL:
if (0 == mComposingText.length()) {
if (mCommittedTextBeforeComposingText.length() > 0) {
mCommittedTextBeforeComposingText.delete(
mCommittedTextBeforeComposingText.length() - 1,
mCommittedTextBeforeComposingText.length());
}
} else {
mComposingText.delete(mComposingText.length() - 1, mComposingText.length());
}
if (mCurrentCursorPosition > 0) mCurrentCursorPosition -= 1;
break;
case KeyEvent.KEYCODE_UNKNOWN:
if (null != keyEvent.getCharacters()) {
mCommittedTextBeforeComposingText.append(keyEvent.getCharacters());
mCurrentCursorPosition += keyEvent.getCharacters().length();
}
break;
default:
final String text = new String(new int[] { keyEvent.getUnicodeChar() }, 0, 1);
mCommittedTextBeforeComposingText.append(text);
mCurrentCursorPosition += text.length();
break;
}
}
if (null != mIC) {
mIC.sendKeyEvent(keyEvent);
if (ProductionFlag.IS_EXPERIMENTAL) {
@ -151,48 +293,83 @@ public class RichInputConnection {
public void setComposingText(final CharSequence text, final int i) {
checkBatchEdit();
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
mCurrentCursorPosition += text.length() - mComposingText.length();
mComposingText.setLength(0);
mComposingText.append(text);
// TODO: support values of i != 1. At this time, this is never called with i != 1.
if (null != mIC) {
mIC.setComposingText(text, i);
if (ProductionFlag.IS_EXPERIMENTAL) {
ResearchLogger.richInputConnection_setComposingText(text, i);
}
}
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
}
public void setSelection(final int from, final int to) {
checkBatchEdit();
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
if (null != mIC) {
mIC.setSelection(from, to);
if (ProductionFlag.IS_EXPERIMENTAL) {
ResearchLogger.richInputConnection_setSelection(from, to);
}
}
mCurrentCursorPosition = from;
mCommittedTextBeforeComposingText.setLength(0);
mCommittedTextBeforeComposingText.append(getTextBeforeCursor(DEFAULT_TEXT_CACHE_SIZE, 0));
}
public void commitCorrection(final CorrectionInfo correctionInfo) {
checkBatchEdit();
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
// This has no effect on the text field and does not change its content. It only makes
// TextView flash the text for a second based on indices contained in the argument.
if (null != mIC) {
mIC.commitCorrection(correctionInfo);
if (ProductionFlag.IS_EXPERIMENTAL) {
ResearchLogger.richInputConnection_commitCorrection(correctionInfo);
}
}
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
}
public void commitCompletion(final CompletionInfo completionInfo) {
checkBatchEdit();
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
final CharSequence text = completionInfo.getText();
mCommittedTextBeforeComposingText.append(text);
mCurrentCursorPosition += text.length() - mComposingText.length();
mComposingText.setLength(0);
if (null != mIC) {
mIC.commitCompletion(completionInfo);
if (ProductionFlag.IS_EXPERIMENTAL) {
ResearchLogger.richInputConnection_commitCompletion(completionInfo);
}
}
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
}
public CharSequence getNthPreviousWord(final String sentenceSeperators, final int n) {
mIC = mParent.getCurrentInputConnection();
if (null == mIC) return null;
final CharSequence prev = mIC.getTextBeforeCursor(LOOKBACK_CHARACTER_NUM, 0);
if (DEBUG_PREVIOUS_TEXT && null != prev) {
final int checkLength = LOOKBACK_CHARACTER_NUM - 1;
final String reference = prev.length() <= checkLength ? prev.toString()
: prev.subSequence(prev.length() - checkLength, prev.length()).toString();
final StringBuilder internal = new StringBuilder()
.append(mCommittedTextBeforeComposingText).append(mComposingText);
if (internal.length() > checkLength) {
internal.delete(0, internal.length() - checkLength);
if (!(reference.equals(internal.toString()))) {
final String context =
"Expected text = " + internal + "\nActual text = " + reference;
((LatinIME)mParent).debugDumpStateAndCrashWithException(context);
}
}
}
return getNthPreviousWord(prev, sentenceSeperators, n);
}