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import { $, offsetTop } from '../util/index';
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export default function (UIkit) {
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UIkit.component('scroll', {
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props: {
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duration: Number,
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transition: String,
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offset: Number
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},
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defaults: {
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duration: 1000,
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transition: 'easeOutExpo',
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offset: 0
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},
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methods: {
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scrollToElement(el) {
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el = $(el);
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// get / set parameters
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var target = offsetTop(el) - this.offset,
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docHeight = document.documentElement.offsetHeight,
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winHeight = window.innerHeight;
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if (target + winHeight > docHeight) {
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target = docHeight - winHeight;
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}
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// animate to target, fire callback when done
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$('html,body')
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.stop()
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.animate({scrollTop: parseInt(target, 10) || 1}, this.duration, this.transition)
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.promise()
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.then(() => this.$el.trigger('scrolled', [this]));
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}
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},
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events: {
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click(e) {
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if (e.isDefaultPrevented()) {
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return;
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}
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e.preventDefault();
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this.scrollToElement($(this.$el[0].hash).length ? this.$el[0].hash : 'body');
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}
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}
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});
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if (!$.easing.easeOutExpo) {
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$.easing.easeOutExpo = function (x, t, b, c, d) {
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return (t === d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;
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};
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}
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}
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