aaac7fed
 liuqimichale
add
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
import { DIRECTION_UP, PROBE_REALTIME } from '../util/const'
export function pullUpMixin(BScroll) {
BScroll.prototype._initPullUp = function () {
// must watch scroll in real time
this.options.probeType = PROBE_REALTIME
this.pullupWatching = false
this._watchPullUp()
}
BScroll.prototype._watchPullUp = function () {
if (this.pullupWatching) {
return
}
this.pullupWatching = true
this.on('scroll', this._checkToEnd)
}
BScroll.prototype._checkToEnd = function (pos) {
const {threshold = 0} = this.options.pullUpLoad
if (this.movingDirectionY === DIRECTION_UP && pos.y <= (this.maxScrollY + threshold)) {
// reset pullupWatching status after scroll end.
this.once('scrollEnd', () => {
this.pullupWatching = false
})
this.trigger('pullingUp')
this.off('scroll', this._checkToEnd)
}
}
BScroll.prototype.finishPullUp = function () {
if (this.pullupWatching) {
this.once('scrollEnd', () => {
this._watchPullUp()
})
} else {
this._watchPullUp()
}
}
BScroll.prototype.openPullUp = function (config = true) {
this.options.pullUpLoad = config
this._initPullUp()
}
BScroll.prototype.closePullUp = function () {
this.options.pullUpLoad = false
if (!this.pullupWatching) {
return
}
this.pullupWatching = false
this.off('scroll', this._checkToEnd)
}
}
|
