git ssb

1
const nest = require('depnest')
2
const pull = require('pull-stream')
3
const Scroller = require('mutant-scroll')
4
const next = require('pull-next-step')
5
6
exports.gives = nest('app.html.scroller')
7
8
exports.needs = nest({
9
  'message.html.render': 'first'
10
})
11
12
exports.create = function (api) {
13
  return nest('app.html.scroller', createScroller)
14
15
  function createScroller (opts = {}) {
16
    const {
17
      stream, // TODO - rename this to createStream (rename across app)
18
      filter = () => pull.filter((msg) => true),
19
      indexProperty = ['timestamp']
20
    } = opts
21
22
    const streamToTop = pull(
23
      next(stream, { live: true, reverse: false, old: false, limit: 100, property: indexProperty }),
24
      filter() // is a pull-stream through
25
    )
26
27
    const streamToBottom = pull(
28
      next(stream, { live: false, reverse: true, limit: 100, property: indexProperty }),
29
      filter()
30
    )
31
32
    const _opts = Object.assign(
33
      { overflowY: 'auto' }, // TODO check across app what makes better default
34
      opts,
35
      { streamToTop, streamToBottom }
36
    )
37
38
    return Scroller(_opts)
39
    // valid Scroller opts :  see github.com/mixmix/mutant-scroll
40
    //   classList = [],
41
    //   prepend = [],
42
    //   append = [],
43
    //   streamToTop,
44
    //   streamToBottom,
45
    //   render,
46
    //   updateTop =  updateTopDefault,
47
    //   updateBottom = updateBottomDefault,
48
    //   store = MutantArray(),
49
    //   cb = (err) => { if (err) throw err }
50
    //   overflowY = 'scroll'
51
  }
52
}
53