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
17package com.android.systemui.classifier;
18
19import android.util.SparseArray;
20import android.view.MotionEvent;
21
22import java.util.ArrayList;
23
24/**
25 * Contains data which is used to classify interaction sequences on the lockscreen. It does, for
26 * example, provide information on the current touch state.
27 */
28public class ClassifierData {
29    private SparseArray<Stroke> mCurrentStrokes = new SparseArray<>();
30    private ArrayList<Stroke> mEndingStrokes = new ArrayList<>();
31    private final float mDpi;
32
33    public ClassifierData(float dpi) {
34        mDpi = dpi;
35    }
36
37    public void update(MotionEvent event) {
38        mEndingStrokes.clear();
39        int action = event.getActionMasked();
40        if (action == MotionEvent.ACTION_DOWN) {
41            mCurrentStrokes.clear();
42        }
43
44        for (int i = 0; i < event.getPointerCount(); i++) {
45            int id = event.getPointerId(i);
46            if (mCurrentStrokes.get(id) == null) {
47                mCurrentStrokes.put(id, new Stroke(event.getEventTimeNano(), mDpi));
48            }
49            mCurrentStrokes.get(id).addPoint(event.getX(i), event.getY(i),
50                    event.getEventTimeNano());
51
52            if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL
53                    || (action == MotionEvent.ACTION_POINTER_UP && i == event.getActionIndex())) {
54                mEndingStrokes.add(getStroke(id));
55            }
56        }
57    }
58
59    public void cleanUp(MotionEvent event) {
60        mEndingStrokes.clear();
61        int action = event.getActionMasked();
62        for (int i = 0; i < event.getPointerCount(); i++) {
63            int id = event.getPointerId(i);
64            if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL
65                    || (action == MotionEvent.ACTION_POINTER_UP && i == event.getActionIndex())) {
66                mCurrentStrokes.remove(id);
67            }
68        }
69    }
70
71    /**
72     * @return the list of Strokes which are ending in the recently added MotionEvent
73     */
74    public ArrayList<Stroke> getEndingStrokes() {
75        return mEndingStrokes;
76    }
77
78    /**
79     * @param id the id from MotionEvent
80     * @return the Stroke assigned to the id
81     */
82    public Stroke getStroke(int id) {
83        return mCurrentStrokes.get(id);
84    }
85}
86