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Mitigates rounding errors due to non-subpixel scroll values

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This commit is contained in:
Thomas Khyn
2016-04-14 12:09:24 +12:00
parent edaeccebf2
commit b0a38741df
1 changed files with 16 additions and 2 deletions
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18
src/js/plugin/update-scroll.js
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@@ -52,12 +52,26 @@ module.exports = function (element, axis, value) {
var i = instances.get(element);
if (axis === 'top' && value >= i.contentHeight - i.containerHeight) {
element.scrollTop = value = i.contentHeight - i.containerHeight; // don't allow scroll past container
// don't allow scroll past container
value = i.contentHeight - i.containerHeight;
if (Math.abs(value - element.scrollTop) <= 1) {
// mitigates rounding errors on non-subpixel scroll values
value = element.scrollTop;
} else {
element.scrollTop = value;
}
element.dispatchEvent(yEndEvent);
}
if (axis === 'left' && value >= i.contentWidth - i.containerWidth) {
element.scrollLeft = value = i.contentWidth - i.containerWidth; // don't allow scroll past container
// don't allow scroll past container
value = i.contentWidth - i.containerWidth;
if (Math.abs(value - element.scrollLeft) <= 1) {
// mitigates rounding errors on non-subpixel scroll values
value = element.scrollLeft;
} else {
element.scrollLeft = value;
}
element.dispatchEvent(xEndEvent);
}