1 /*
2  * Copyright (C) 2013 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.keyboard.internal;
18 
19 public final class TypingTimeRecorder {
20     private final int mStaticTimeThresholdAfterFastTyping; // msec
21     private final int mSuppressKeyPreviewAfterBatchInputDuration;
22     private long mLastTypingTime;
23     private long mLastLetterTypingTime;
24     private long mLastBatchInputTime;
25 
TypingTimeRecorder(final int staticTimeThresholdAfterFastTyping, final int suppressKeyPreviewAfterBatchInputDuration)26     public TypingTimeRecorder(final int staticTimeThresholdAfterFastTyping,
27             final int suppressKeyPreviewAfterBatchInputDuration) {
28         mStaticTimeThresholdAfterFastTyping = staticTimeThresholdAfterFastTyping;
29         mSuppressKeyPreviewAfterBatchInputDuration = suppressKeyPreviewAfterBatchInputDuration;
30     }
31 
isInFastTyping(final long eventTime)32     public boolean isInFastTyping(final long eventTime) {
33         final long elapsedTimeSinceLastLetterTyping = eventTime - mLastLetterTypingTime;
34         return elapsedTimeSinceLastLetterTyping < mStaticTimeThresholdAfterFastTyping;
35     }
36 
wasLastInputTyping()37     private boolean wasLastInputTyping() {
38         return mLastTypingTime >= mLastBatchInputTime;
39     }
40 
onCodeInput(final int code, final long eventTime)41     public void onCodeInput(final int code, final long eventTime) {
42         // Record the letter typing time when
43         // 1. Letter keys are typed successively without any batch input in between.
44         // 2. A letter key is typed within the threshold time since the last any key typing.
45         // 3. A non-letter key is typed within the threshold time since the last letter key typing.
46         if (Character.isLetter(code)) {
47             if (wasLastInputTyping()
48                     || eventTime - mLastTypingTime < mStaticTimeThresholdAfterFastTyping) {
49                 mLastLetterTypingTime = eventTime;
50             }
51         } else {
52             if (eventTime - mLastLetterTypingTime < mStaticTimeThresholdAfterFastTyping) {
53                 // This non-letter typing should be treated as a part of fast typing.
54                 mLastLetterTypingTime = eventTime;
55             }
56         }
57         mLastTypingTime = eventTime;
58     }
59 
onEndBatchInput(final long eventTime)60     public void onEndBatchInput(final long eventTime) {
61         mLastBatchInputTime = eventTime;
62     }
63 
getLastLetterTypingTime()64     public long getLastLetterTypingTime() {
65         return mLastLetterTypingTime;
66     }
67 
needsToSuppressKeyPreviewPopup(final long eventTime)68     public boolean needsToSuppressKeyPreviewPopup(final long eventTime) {
69         return !wasLastInputTyping()
70                 && eventTime - mLastBatchInputTime < mSuppressKeyPreviewAfterBatchInputDuration;
71     }
72 }
73