om/node_modules/vuetify/lib/mixins/translatable.js

import Vue from 'vue';
export default Vue.extend({
    name: 'translatable',
    props: {
        height: Number
    },
    data: function data() {
        return {
            elOffsetTop: 0,
            parallax: 0,
            parallaxDist: 0,
            percentScrolled: 0,
            scrollTop: 0,
            windowHeight: 0,
            windowBottom: 0
        };
    },
    computed: {
        imgHeight: function imgHeight() {
            return this.objHeight();
        }
    },
    beforeDestroy: function beforeDestroy() {
        window.removeEventListener('scroll', this.translate, false);
        window.removeEventListener('resize', this.translate, false);
    },

    methods: {
        calcDimensions: function calcDimensions() {
            var offset = this.$el.getBoundingClientRect();
            this.scrollTop = window.pageYOffset;
            this.parallaxDist = this.imgHeight - this.height;
            this.elOffsetTop = offset.top + this.scrollTop;
            this.windowHeight = window.innerHeight;
            this.windowBottom = this.scrollTop + this.windowHeight;
        },
        listeners: function listeners() {
            window.addEventListener('scroll', this.translate, false);
            window.addEventListener('resize', this.translate, false);
        },

        /** @abstract **/
        objHeight: function objHeight() {
            throw new Error('Not implemented !');
        },
        translate: function translate() {
            this.calcDimensions();
            this.percentScrolled = (this.windowBottom - this.elOffsetTop) / (parseInt(this.height) + this.windowHeight);
            this.parallax = Math.round(this.parallaxDist * this.percentScrolled);
        }
    }
});
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