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Clarify the expected cursor position in RichInputConnection. 

Change-Id: I4d36a23567415c3a293a588b51b46006256c148f
main
Jean Chalard 2013-07-31 12:17:37 +09:00
parent ab2d273133
commit aa108f1d7f
1 changed files with 29 additions and 26 deletions
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55
java/src/com/android/inputmethod/latin/RichInputConnection.java
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@ -56,11 +56,14 @@ public final class RichInputConnection {
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.
* This variable contains an expected value for the cursor position. This is where the
* cursor may end up after all the keyboard-triggered updates have passed. We keep this to
* compare it to the actual cursor position to guess whether the move was caused by a
* keyboard command or not.
* It's not really the cursor position: the cursor may not be there yet, and it's also expected
* there be cases where it never actually comes to be there.
*/
private int mCurrentCursorPosition = INVALID_CURSOR_POSITION; // in chars, not code points
private int mExpectedCursorPosition = 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.
@ -101,16 +104,16 @@ public final class RichInputConnection {
final String reference = (beforeCursor.length() <= actualLength) ? beforeCursor.toString()
: beforeCursor.subSequence(beforeCursor.length() - actualLength,
beforeCursor.length()).toString();
if (et.selectionStart != mCurrentCursorPosition
if (et.selectionStart != mExpectedCursorPosition
|| !(reference.equals(internal.toString()))) {
final String context = "Expected cursor position = " + mCurrentCursorPosition
final String context = "Expected cursor position = " + mExpectedCursorPosition
+ "\nActual cursor position = " + et.selectionStart
+ "\nExpected text = " + internal.length() + " " + internal
+ "\nActual text = " + reference.length() + " " + reference;
((LatinIME)mParent).debugDumpStateAndCrashWithException(context);
} else {
Log.e(TAG, DebugLogUtils.getStackTrace(2));
Log.e(TAG, "Exp <> Actual : " + mCurrentCursorPosition + " <> " + et.selectionStart);
Log.e(TAG, "Exp <> Actual : " + mExpectedCursorPosition + " <> " + et.selectionStart);
}
}
@ -141,7 +144,7 @@ public final class RichInputConnection {
public void resetCachesUponCursorMove(final int newCursorPosition,
final boolean shouldFinishComposition) {
mCurrentCursorPosition = newCursorPosition;
mExpectedCursorPosition = newCursorPosition;
mComposingText.setLength(0);
mCommittedTextBeforeComposingText.setLength(0);
final CharSequence textBeforeCursor = getTextBeforeCursor(DEFAULT_TEXT_CACHE_SIZE, 0);
@ -166,7 +169,7 @@ public final class RichInputConnection {
if (DEBUG_BATCH_NESTING) checkBatchEdit();
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
mCommittedTextBeforeComposingText.append(mComposingText);
mCurrentCursorPosition += mComposingText.length();
mExpectedCursorPosition += mComposingText.length();
mComposingText.setLength(0);
if (null != mIC) {
mIC.finishComposingText();
@ -180,7 +183,7 @@ public final class RichInputConnection {
if (DEBUG_BATCH_NESTING) checkBatchEdit();
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
mCommittedTextBeforeComposingText.append(text);
mCurrentCursorPosition += text.length() - mComposingText.length();
mExpectedCursorPosition += text.length() - mComposingText.length();
mComposingText.setLength(0);
if (null != mIC) {
mIC.commitText(text, i);
@ -193,7 +196,7 @@ public final class RichInputConnection {
}
public boolean canDeleteCharacters() {
return mCurrentCursorPosition > 0;
return mExpectedCursorPosition > 0;
}
/**
@ -230,7 +233,7 @@ public final class RichInputConnection {
// heavy pressing of delete, for example DEFAULT_TEXT_CACHE_SIZE - 5 times or so.
// getCapsMode should be updated to be able to return a "not enough info" result so that
// we can get more context only when needed.
if (TextUtils.isEmpty(mCommittedTextBeforeComposingText) && 0 != mCurrentCursorPosition) {
if (TextUtils.isEmpty(mCommittedTextBeforeComposingText) && 0 != mExpectedCursorPosition) {
mCommittedTextBeforeComposingText.append(
getTextBeforeCursor(DEFAULT_TEXT_CACHE_SIZE, 0));
}
@ -251,7 +254,7 @@ public final class RichInputConnection {
mCommittedTextBeforeComposingText.length() + mComposingText.length();
// If we have enough characters to satisfy the request, or if we have all characters in
// the text field, then we can return the cached version right away.
if (cachedLength >= n || cachedLength >= mCurrentCursorPosition) {
if (cachedLength >= n || cachedLength >= mExpectedCursorPosition) {
final StringBuilder s = new StringBuilder(mCommittedTextBeforeComposingText);
s.append(mComposingText);
if (s.length() > n) {
@ -284,10 +287,10 @@ public final class RichInputConnection {
+ remainingChars, 0);
mCommittedTextBeforeComposingText.setLength(len);
}
if (mCurrentCursorPosition > beforeLength) {
mCurrentCursorPosition -= beforeLength;
if (mExpectedCursorPosition > beforeLength) {
mExpectedCursorPosition -= beforeLength;
} else {
mCurrentCursorPosition = 0;
mExpectedCursorPosition = 0;
}
if (null != mIC) {
mIC.deleteSurroundingText(beforeLength, afterLength);
@ -321,7 +324,7 @@ public final class RichInputConnection {
switch (keyEvent.getKeyCode()) {
case KeyEvent.KEYCODE_ENTER:
mCommittedTextBeforeComposingText.append("\n");
mCurrentCursorPosition += 1;
mExpectedCursorPosition += 1;
break;
case KeyEvent.KEYCODE_DEL:
if (0 == mComposingText.length()) {
@ -333,18 +336,18 @@ public final class RichInputConnection {
} else {
mComposingText.delete(mComposingText.length() - 1, mComposingText.length());
}
if (mCurrentCursorPosition > 0) mCurrentCursorPosition -= 1;
if (mExpectedCursorPosition > 0) mExpectedCursorPosition -= 1;
break;
case KeyEvent.KEYCODE_UNKNOWN:
if (null != keyEvent.getCharacters()) {
mCommittedTextBeforeComposingText.append(keyEvent.getCharacters());
mCurrentCursorPosition += keyEvent.getCharacters().length();
mExpectedCursorPosition += keyEvent.getCharacters().length();
}
break;
default:
final String text = new String(new int[] { keyEvent.getUnicodeChar() }, 0, 1);
mCommittedTextBeforeComposingText.append(text);
mCurrentCursorPosition += text.length();
mExpectedCursorPosition += text.length();
break;
}
}
@ -378,7 +381,7 @@ public final class RichInputConnection {
public void setComposingText(final CharSequence text, final int newCursorPosition) {
if (DEBUG_BATCH_NESTING) checkBatchEdit();
if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
mCurrentCursorPosition += text.length() - mComposingText.length();
mExpectedCursorPosition += 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.
@ -400,7 +403,7 @@ public final class RichInputConnection {
ResearchLogger.richInputConnection_setSelection(start, end);
}
}
mCurrentCursorPosition = start;
mExpectedCursorPosition = start;
mCommittedTextBeforeComposingText.setLength(0);
mCommittedTextBeforeComposingText.append(getTextBeforeCursor(DEFAULT_TEXT_CACHE_SIZE, 0));
}
@ -423,7 +426,7 @@ public final class RichInputConnection {
// text should never be null, but just in case, it's better to insert nothing than to crash
if (null == text) text = "";
mCommittedTextBeforeComposingText.append(text);
mCurrentCursorPosition += text.length() - mComposingText.length();
mExpectedCursorPosition += text.length() - mComposingText.length();
mComposingText.setLength(0);
if (null != mIC) {
mIC.commitCompletion(completionInfo);
@ -705,14 +708,14 @@ public final class RichInputConnection {
*/
public boolean isBelatedExpectedUpdate(final int oldSelStart, final int newSelStart) {
// If this is an update that arrives at our expected position, it's a belated update.
if (newSelStart == mCurrentCursorPosition) return true;
if (newSelStart == mExpectedCursorPosition) return true;
// If this is an update that moves the cursor from our expected position, it must be
// an explicit move.
if (oldSelStart == mCurrentCursorPosition) return false;
if (oldSelStart == mExpectedCursorPosition) return false;
// The following returns true if newSelStart is between oldSelStart and
// mCurrentCursorPosition. We assume that if the updated position is between the old
// position and the expected position, then it must be a belated update.
return (newSelStart - oldSelStart) * (mCurrentCursorPosition - newSelStart) >= 0;
return (newSelStart - oldSelStart) * (mExpectedCursorPosition - newSelStart) >= 0;
}
/**