Blazej Magnowski | 68d0c9b | 2015-09-18 17:25:55 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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.systemui.classifier; |
| 18 | |
| 19 | import android.hardware.Sensor; |
| 20 | import android.hardware.SensorEvent; |
| 21 | import android.view.MotionEvent; |
| 22 | |
| 23 | /** |
| 24 | * A classifier which looks at the proximity sensor during the gesture. It calculates the percentage |
| 25 | * the proximity sensor showing the near state during the whole gesture |
| 26 | */ |
| 27 | public class ProximityClassifier extends GestureClassifier { |
| 28 | private long mGestureStartTimeNano; |
| 29 | private long mNearStartTimeNano; |
| 30 | private long mNearDuration; |
| 31 | private boolean mNear; |
| 32 | private float mAverageNear; |
| 33 | |
| 34 | public ProximityClassifier(ClassifierData classifierData) { |
| 35 | } |
| 36 | |
| 37 | @Override |
| 38 | public void onSensorChanged(SensorEvent event) { |
| 39 | if (event.sensor.getType() == Sensor.TYPE_PROXIMITY) { |
| 40 | update(event.values[0] < event.sensor.getMaximumRange(), event.timestamp); |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | @Override |
| 45 | public void onTouchEvent(MotionEvent event) { |
| 46 | int action = event.getActionMasked(); |
| 47 | |
| 48 | if (action == MotionEvent.ACTION_DOWN) { |
| 49 | mGestureStartTimeNano = event.getEventTimeNano(); |
| 50 | mNearStartTimeNano = event.getEventTimeNano(); |
| 51 | mNearDuration = 0; |
| 52 | } |
| 53 | |
| 54 | if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) { |
| 55 | update(mNear, event.getEventTimeNano()); |
| 56 | long duration = event.getEventTimeNano() - mGestureStartTimeNano; |
| 57 | |
| 58 | if (duration == 0) { |
| 59 | mAverageNear = mNear ? 1.0f : 0.0f; |
| 60 | } else { |
| 61 | mAverageNear = (float) mNearDuration / (float) duration; |
| 62 | } |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | |
| 67 | /** |
| 68 | * @param near is the sensor showing the near state right now |
| 69 | * @param timestampNano time of this event in nanoseconds |
| 70 | */ |
| 71 | private void update(boolean near, long timestampNano) { |
| 72 | // This if is necessary because MotionEvents and SensorEvents do not come in |
| 73 | // chronological order |
| 74 | if (timestampNano > mNearStartTimeNano) { |
| 75 | // if the state before was near then add the difference of the current time and |
| 76 | // mNearStartTimeNano to mNearDuration. |
| 77 | if (mNear) { |
| 78 | mNearDuration += timestampNano - mNearStartTimeNano; |
| 79 | } |
| 80 | |
| 81 | // if the new state is near, set mNearStartTimeNano equal to this moment. |
| 82 | if (near) { |
| 83 | mNearStartTimeNano = timestampNano; |
| 84 | } |
| 85 | } |
| 86 | mNear = near; |
| 87 | } |
| 88 | |
| 89 | @Override |
| 90 | public float getFalseTouchEvaluation(int type) { |
| 91 | return ProximityEvaluator.evaluate(mAverageNear, type); |
| 92 | } |
| 93 | } |