git ssb

1
var { h, Value, computed } = require('mutant')
2
var ObserveLinkHover = require('../../lib/observe-link-hover')
3
var ref = require('ssb-ref')
4
5
var nest = require('depnest')
6
7
exports.needs = nest({
8
  'intl.sync.i18n': 'first',
9
  'profile.html.preview': 'first',
10
  'channel.html.preview': 'first'
11
})
12
13
exports.gives = nest('app.linkPreview')
14
15
exports.create = function (api) {
16
  var i18n = api.intl.sync.i18n
17
  return nest('app.linkPreview', function (container, delay) {
18
    var currentHover = ObserveLinkHover(container, (value, lastValue) => {
19
      var href = value && value.getAttribute('href')
20
      var oldHref = lastValue && lastValue.getAttribute('href')
21
22
      var delay = 500
23
      if (href && oldHref) {
24
        delay = 100
25
      } else if (!value) {
26
        delay = 200
27
      }
28
29
      return delay
30
    })
31
    var previewElement = Value()
32
33
    // hide preview on scroll
34
    var hasPreview = computed(previewElement, x => !!x)
35
    hasPreview(value => {
36
      if (value) {
37
        window.addEventListener('wheel', previewElement.cancel)
38
      } else {
39
        window.removeEventListener('wheel', previewElement.cancel)
40
      }
41
    })
42
43
    currentHover(element => {
44
      var href = element && element.getAttribute('href')
45
      var preview = null
46
47
      if (href) {
48
        if (ref.isFeed(href)) {
49
          preview = api.profile.html.preview(href)
50
        } else if (href.includes('://')) {
51
          preview = h('ProfilePreview', [
52
            h('section', [
53
              h('strong', [i18n('External Link'), ' 🌐']), h('br'),
54
              h('code', href)
55
            ])
56
          ])
57
        } else if (href.startsWith('#')) {
58
          preview = api.channel.html.preview(href.slice(1))
59
        }
60
      }
61
62
      if (preview) {
63
        var rect = element.getBoundingClientRect()
64
        var width = 510
65
        var maxLeft = window.innerWidth - width
66
        var maxTop = window.innerHeight - 100
67
        var distanceFromRight = window.innerWidth - rect.right
68
        var shouldDisplayBeside = rect.bottom > maxTop || rect.left < 50 || distanceFromRight < 50
69
70
        if (shouldDisplayBeside && rect.bottom > 50) {
71
          if (rect.right > maxLeft && (rect.left - width) < 0) {
72
            // no room, just give up!
73
            previewElement.set(null)
74
            return
75
          } else {
76
            preview.style.top = `${Math.min(rect.top, maxTop)}px`
77
            if (rect.right > maxLeft) {
78
              preview.style.left = `${rect.left - width}px`
79
            } else {
80
              preview.style.left = `${rect.right + 5}px`
81
            }
82
          }
83
        } else {
84
          preview.style.top = `${rect.bottom + 5}px`
85
          preview.style.left = `${Math.min(rect.left, maxLeft)}px`
86
        }
87
88
        previewElement.set(preview)
89
      } else if (element !== false) {
90
        previewElement.set(null)
91
      }
92
    })
93
94
    previewElement.cancel = function () {
95
      currentHover.cancel()
96
      previewElement.set(null)
97
    }
98
99
    return previewElement
100
  })
101
}
102