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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.inputmethod.latin;
     18 
     19 import android.text.TextUtils;
     20 
     21 /**
     22  * This class encapsulates data about a word previously composed, but that has been
     23  * committed already. This is used for resuming suggestion, and cancel auto-correction.
     24  */
     25 public final class LastComposedWord {
     26     // COMMIT_TYPE_USER_TYPED_WORD is used when the word committed is the exact typed word, with
     27     // no hinting from the IME. It happens when some external event happens (rotating the device,
     28     // for example) or when auto-correction is off by settings or editor attributes.
     29     public static final int COMMIT_TYPE_USER_TYPED_WORD = 0;
     30     // COMMIT_TYPE_MANUAL_PICK is used when the user pressed a field in the suggestion strip.
     31     public static final int COMMIT_TYPE_MANUAL_PICK = 1;
     32     // COMMIT_TYPE_DECIDED_WORD is used when the IME commits the word it decided was best
     33     // for the current user input. It may be different from what the user typed (true auto-correct)
     34     // or it may be exactly what the user typed if it's in the dictionary or the IME does not have
     35     // enough confidence in any suggestion to auto-correct (auto-correct to typed word).
     36     public static final int COMMIT_TYPE_DECIDED_WORD = 2;
     37     // COMMIT_TYPE_CANCEL_AUTO_CORRECT is used upon committing back the old word upon cancelling
     38     // an auto-correction.
     39     public static final int COMMIT_TYPE_CANCEL_AUTO_CORRECT = 3;
     40 
     41     public static final String NOT_A_SEPARATOR = "";
     42 
     43     public final int[] mPrimaryKeyCodes;
     44     public final String mTypedWord;
     45     public final String mCommittedWord;
     46     public final String mSeparatorString;
     47     public final String mPrevWord;
     48     public final int mCapitalizedMode;
     49     public final InputPointers mInputPointers =
     50             new InputPointers(Constants.Dictionary.MAX_WORD_LENGTH);
     51 
     52     private boolean mActive;
     53 
     54     public static final LastComposedWord NOT_A_COMPOSED_WORD =
     55             new LastComposedWord(null, null, "", "", NOT_A_SEPARATOR, null,
     56             WordComposer.CAPS_MODE_OFF);
     57 
     58     // Warning: this is using the passed objects as is and fully expects them to be
     59     // immutable. Do not fiddle with their contents after you passed them to this constructor.
     60     public LastComposedWord(final int[] primaryKeyCodes, final InputPointers inputPointers,
     61             final String typedWord, final String committedWord, final String separatorString,
     62             final String prevWord, final int capitalizedMode) {
     63         mPrimaryKeyCodes = primaryKeyCodes;
     64         if (inputPointers != null) {
     65             mInputPointers.copy(inputPointers);
     66         }
     67         mTypedWord = typedWord;
     68         mCommittedWord = committedWord;
     69         mSeparatorString = separatorString;
     70         mActive = true;
     71         mPrevWord = prevWord;
     72         mCapitalizedMode = capitalizedMode;
     73     }
     74 
     75     public void deactivate() {
     76         mActive = false;
     77     }
     78 
     79     public boolean canRevertCommit() {
     80         return mActive && !TextUtils.isEmpty(mCommittedWord) && !didCommitTypedWord();
     81     }
     82 
     83     private boolean didCommitTypedWord() {
     84         return TextUtils.equals(mTypedWord, mCommittedWord);
     85     }
     86 
     87     public static int getSeparatorLength(final String separatorString) {
     88         return StringUtils.codePointCount(separatorString);
     89     }
     90 }
     91