Files: ace618ff270ef2a33d54baecce5f928e9e352507 / lib / expander-hook.js
739 bytesRaw
| 1 | module.exports = ExpanderHook |
| 2 | |
| 3 | function ExpanderHook (needsExpand) { |
| 4 | return expander.bind(null, needsExpand) |
| 5 | } |
| 6 | |
| 7 | function expander (needsExpand, element) { |
| 8 | var handler = { handleEvent, needsExpand, element } |
| 9 | handleEvent.call(handler) |
| 10 | |
| 11 | if (element.querySelector('img')) { |
| 12 | // just in case images are still loading |
| 13 | setTimeout(handleEvent.bind(handler), 200) |
| 14 | element.addEventListener('mouseover', handler) |
| 15 | return element.removeEventListener.bind(element, 'mouseover', handler) |
| 16 | } |
| 17 | } |
| 18 | |
| 19 | function handleEvent (ev) { |
| 20 | var { needsExpand, element } = this |
| 21 | if (!needsExpand()) { |
| 22 | if (element.firstElementChild && element.firstElementChild.clientHeight + 5 > element.clientHeight) { |
| 23 | needsExpand.set(true) |
| 24 | } |
| 25 | } |
| 26 | } |
| 27 |
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