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alanz / patchwork



forked from Matt McKegg / patchwork

Tree: 76bc25fbc6edd50d2de53f58f3033960b0b32a34

Files: 76bc25fbc6edd50d2de53f58f3033960b0b32a34 / lib / observe-link-hover.js

776 bytesRaw
1var Sustained = require('./sustained')
2var Value = require('mutant/value')
3
4module.exports = function (root, delay) {
5 var target = Value()
6 root.addEventListener('mouseover', (ev) => {
7 var anchor = null
8 for (var n = ev.target; n.parentNode; n = n.parentNode) {
9 if (n.nodeName === 'A') {
10 anchor = n
11 break
12 }
13 }
14 target.set(anchor)
15 })
16
17 root.addEventListener('mouseleave', (ev) => {
18 target.set(false)
19 })
20
21 var active = Value(false)
22
23 var result = Sustained(target, delay || 500, (v) => {
24 // immediately switch to new hover if there is a current hover in place
25 return v === undefined || (active() && v && v !== result())
26 })
27
28 result.cancel = () => target.set(undefined)
29 result.active = active
30 return result
31}
32

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