1package com.cheogram.android;
 2
 3import android.util.Log;
 4import android.view.MotionEvent;
 5import android.view.View;
 6
 7import androidx.core.util.Consumer;
 8
 9// https://stackoverflow.com/a/41766670/8611
10/**
11 * Created by hoshyar on 1/19/17.
12 */
13
14public class SwipeDetector implements View.OnTouchListener {
15
16    protected Consumer<Action> cb;
17    public SwipeDetector(Consumer<Action> cb) {
18        this.cb = cb;
19    }
20
21    public static enum Action {
22        LR, // Left to Right
23        RL, // Right to Left
24        TB, // Top to bottom
25        BT, // Bottom to Top
26        None // when no action was detected
27    }
28
29    private static final String logTag = "Swipe";
30    private static final int MIN_DISTANCE = 100;
31    private float downX, downY, upX, upY;
32    private Action mSwipeDetected = Action.None;
33
34    public boolean swipeDetected() {
35        return mSwipeDetected != Action.None;
36    }
37
38    public Action getAction() {
39        return mSwipeDetected;
40    }
41
42    @Override
43    public boolean onTouch(View v, MotionEvent event) {
44        switch (event.getAction()) {
45            case MotionEvent.ACTION_DOWN:
46                downX = event.getX();
47                downY = event.getY();
48                mSwipeDetected = Action.None;
49                return false;
50
51            case MotionEvent.ACTION_MOVE:
52                upX = event.getX();
53                upY = event.getY();
54
55                float deltaX = downX - upX;
56                float deltaY = downY - upY;
57
58                if (Math.abs(deltaY) < 15 && deltaX < -15) {
59                    v.getParent().requestDisallowInterceptTouchEvent(true);
60                }
61
62                if (Math.abs(deltaX) > MIN_DISTANCE) {
63                    // left or right
64                    if (deltaX < 0) {
65                        cb.accept(mSwipeDetected = Action.LR);
66                        return false;
67                    }
68                    if (deltaX > 0) {
69                        cb.accept(mSwipeDetected = Action.RL);
70                        return false;
71                    }
72                } else if (Math.abs(deltaY) > MIN_DISTANCE) {
73                    if (deltaY < 0) {
74                        cb.accept(mSwipeDetected = Action.TB);
75                        return false;
76                    }
77                    if (deltaY > 0) {
78                        cb.accept(mSwipeDetected = Action.BT);
79                        return false;
80                    }
81                }
82                return false;
83        }
84        return false;
85    }
86}