1 |
|
2 |
|
3 |
|
4 |
|
5 |
|
6 |
|
7 |
|
8 |
|
9 |
|
10 | 'use strict';
|
11 |
|
12 | var EventPluginUtils = require('./EventPluginUtils');
|
13 | var EventPropagators = require('./EventPropagators');
|
14 | var SyntheticUIEvent = require('./SyntheticUIEvent');
|
15 | var TouchEventUtils = require('fbjs/lib/TouchEventUtils');
|
16 | var ViewportMetrics = require('./ViewportMetrics');
|
17 |
|
18 | var isStartish = EventPluginUtils.isStartish;
|
19 | var isEndish = EventPluginUtils.isEndish;
|
20 |
|
21 |
|
22 |
|
23 |
|
24 |
|
25 |
|
26 |
|
27 |
|
28 |
|
29 |
|
30 |
|
31 |
|
32 |
|
33 |
|
34 | var tapMoveThreshold = 10;
|
35 | var startCoords = { x: 0, y: 0 };
|
36 |
|
37 | var Axis = {
|
38 | x: { page: 'pageX', client: 'clientX', envScroll: 'currentPageScrollLeft' },
|
39 | y: { page: 'pageY', client: 'clientY', envScroll: 'currentPageScrollTop' }
|
40 | };
|
41 |
|
42 | function getAxisCoordOfEvent(axis, nativeEvent) {
|
43 | var singleTouch = TouchEventUtils.extractSingleTouch(nativeEvent);
|
44 | if (singleTouch) {
|
45 | return singleTouch[axis.page];
|
46 | }
|
47 | return axis.page in nativeEvent ? nativeEvent[axis.page] : nativeEvent[axis.client] + ViewportMetrics[axis.envScroll];
|
48 | }
|
49 |
|
50 | function getDistance(coords, nativeEvent) {
|
51 | var pageX = getAxisCoordOfEvent(Axis.x, nativeEvent);
|
52 | var pageY = getAxisCoordOfEvent(Axis.y, nativeEvent);
|
53 | return Math.pow(Math.pow(pageX - coords.x, 2) + Math.pow(pageY - coords.y, 2), 0.5);
|
54 | }
|
55 |
|
56 | var touchEvents = ['topTouchStart', 'topTouchCancel', 'topTouchEnd', 'topTouchMove'];
|
57 |
|
58 | var dependencies = ['topMouseDown', 'topMouseMove', 'topMouseUp'].concat(touchEvents);
|
59 |
|
60 | var eventTypes = {
|
61 | touchTap: {
|
62 | phasedRegistrationNames: {
|
63 | bubbled: 'onTouchTap',
|
64 | captured: 'onTouchTapCapture'
|
65 | },
|
66 | dependencies: dependencies
|
67 | }
|
68 | };
|
69 |
|
70 | var usedTouch = false;
|
71 | var usedTouchTime = 0;
|
72 | var TOUCH_DELAY = 1000;
|
73 |
|
74 | var TapEventPlugin = {
|
75 | tapMoveThreshold: tapMoveThreshold,
|
76 |
|
77 | eventTypes: eventTypes,
|
78 |
|
79 | extractEvents: function (topLevelType, targetInst, nativeEvent, nativeEventTarget) {
|
80 | if (!isStartish(topLevelType) && !isEndish(topLevelType)) {
|
81 | return null;
|
82 | }
|
83 |
|
84 |
|
85 |
|
86 | if (touchEvents.indexOf(topLevelType) !== -1) {
|
87 | usedTouch = true;
|
88 | usedTouchTime = Date.now();
|
89 | } else {
|
90 | if (usedTouch && Date.now() - usedTouchTime < TOUCH_DELAY) {
|
91 | return null;
|
92 | }
|
93 | }
|
94 | var event = null;
|
95 | var distance = getDistance(startCoords, nativeEvent);
|
96 | if (isEndish(topLevelType) && distance < tapMoveThreshold) {
|
97 | event = SyntheticUIEvent.getPooled(eventTypes.touchTap, targetInst, nativeEvent, nativeEventTarget);
|
98 | }
|
99 | if (isStartish(topLevelType)) {
|
100 | startCoords.x = getAxisCoordOfEvent(Axis.x, nativeEvent);
|
101 | startCoords.y = getAxisCoordOfEvent(Axis.y, nativeEvent);
|
102 | } else if (isEndish(topLevelType)) {
|
103 | startCoords.x = 0;
|
104 | startCoords.y = 0;
|
105 | }
|
106 | EventPropagators.accumulateTwoPhaseDispatches(event);
|
107 | return event;
|
108 | }
|
109 | };
|
110 |
|
111 | module.exports = TapEventPlugin; |
\ | No newline at end of file |