diff options
| -rw-r--r-- | content_scripts/scroller.coffee | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/content_scripts/scroller.coffee b/content_scripts/scroller.coffee index a2617289..09470158 100644 --- a/content_scripts/scroller.coffee +++ b/content_scripts/scroller.coffee @@ -4,6 +4,13 @@ # activatedElement = null +# Return 0, -1 or 1: the sign of the argument. +getSign = (val) -> + if not val + 0 + else + if val < 0 then -1 else 1 + scrollProperties = x: { axisName: 'scrollLeft' @@ -63,7 +70,7 @@ doesScroll = (element, direction, amount, factor) -> # we're definitely scrolling forwards, so any positive value will do for delta. In the latter, we're # definitely scrolling backwards, so a delta of -1 will do. For absolute scrolls, factor is always 1. delta = factor * getDimension(element, direction, amount) || -1 - delta = Math.sign delta # 1 or -1 + delta = getSign delta # 1 or -1 performScroll(element, direction, delta) and performScroll(element, direction, -delta) # From element and its parents, find the first which we should scroll and which does scroll. @@ -136,7 +143,7 @@ CoreScroller = myKeyIsStillDown = => @time == activationTime and @keyIsDown # Store amount's sign and make amount positive; the arithmetic is clearer when amount is positive. - sign = Math.sign amount + sign = getSign amount amount = Math.abs amount # Initial intended scroll duration (in ms). We allow a bit longer for longer scrolls. |