53 lines
1.7 KiB
JavaScript
53 lines
1.7 KiB
JavaScript
import Vue from 'vue';
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export default Vue.extend({
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name: 'translatable',
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props: {
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height: Number
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},
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data: function data() {
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return {
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elOffsetTop: 0,
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parallax: 0,
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parallaxDist: 0,
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percentScrolled: 0,
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scrollTop: 0,
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windowHeight: 0,
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windowBottom: 0
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};
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},
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computed: {
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imgHeight: function imgHeight() {
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return this.objHeight();
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}
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},
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beforeDestroy: function beforeDestroy() {
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window.removeEventListener('scroll', this.translate, false);
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window.removeEventListener('resize', this.translate, false);
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},
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methods: {
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calcDimensions: function calcDimensions() {
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var offset = this.$el.getBoundingClientRect();
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this.scrollTop = window.pageYOffset;
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this.parallaxDist = this.imgHeight - this.height;
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this.elOffsetTop = offset.top + this.scrollTop;
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this.windowHeight = window.innerHeight;
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this.windowBottom = this.scrollTop + this.windowHeight;
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},
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listeners: function listeners() {
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window.addEventListener('scroll', this.translate, false);
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window.addEventListener('resize', this.translate, false);
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},
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/** @abstract **/
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objHeight: function objHeight() {
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throw new Error('Not implemented !');
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},
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translate: function translate() {
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this.calcDimensions();
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this.percentScrolled = (this.windowBottom - this.elOffsetTop) / (parseInt(this.height) + this.windowHeight);
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this.parallax = Math.round(this.parallaxDist * this.percentScrolled);
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}
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}
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});
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//# sourceMappingURL=translatable.js.map
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