Files: cac493633ab8c5ac065aecbac0779e1a94abe6b3 / keyscroll.js
799 bytesRaw
| 1 | module.exports = function (container) { |
| 2 | var curMsgEl |
| 3 | |
| 4 | if (!container) |
| 5 | return function() {} |
| 6 | |
| 7 | container.addEventListener('click', onActivateChild, false) |
| 8 | container.addEventListener('focus', onActivateChild, true) |
| 9 | |
| 10 | function onActivateChild(ev) { |
| 11 | for (var el = ev.target; el; el = el.parentNode) { |
| 12 | if (el.parentNode == container) { |
| 13 | curMsgEl = el |
| 14 | return |
| 15 | } |
| 16 | } |
| 17 | } |
| 18 | |
| 19 | function selectChild(el) { |
| 20 | if (!el) return |
| 21 | (el.scrollIntoViewIfNeeded || el.scrollIntoView).call(el) |
| 22 | el.focus() |
| 23 | curMsgEl = el |
| 24 | } |
| 25 | |
| 26 | return function scroll(d) { |
| 27 | selectChild(!curMsgEl ? container.firstChild |
| 28 | : d > 0 ? curMsgEl.nextElementSibling || container.lastChild |
| 29 | : d < 0 ? curMsgEl.previousElementSibling || container.firstChild |
| 30 | : curMsgEl) |
| 31 | } |
| 32 | } |
| 33 |
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