om/node_modules/vuetify/lib/components/VMenu/mixins/menu-position.js

/**
 * Menu position
 *
 * @mixin
 *
 * Used for calculating an automatic position (used for VSelect)
 * Will position the VMenu content properly over the VSelect
 */
/* @vue/component */
export default {
    data: function data() {
        return {
            calculatedTopAuto: 0
        };
    },
    methods: {
        calcScrollPosition: function calcScrollPosition() {
            var $el = this.$refs.content;
            var activeTile = $el.querySelector('.v-list__tile--active');
            var maxScrollTop = $el.scrollHeight - $el.offsetHeight;
            return activeTile ? Math.min(maxScrollTop, Math.max(0, activeTile.offsetTop - $el.offsetHeight / 2 + activeTile.offsetHeight / 2)) : $el.scrollTop;
        },
        calcLeftAuto: function calcLeftAuto() {
            if (this.isAttached) return 0;
            return parseInt(this.dimensions.activator.left - this.defaultOffset * 2);
        },
        calcTopAuto: function calcTopAuto() {
            var $el = this.$refs.content;
            var activeTile = $el.querySelector('.v-list__tile--active');
            if (!activeTile) {
                this.selectedIndex = null;
            }
            if (this.offsetY || !activeTile) {
                return this.computedTop;
            }
            this.selectedIndex = Array.from(this.tiles).indexOf(activeTile);
            var tileDistanceFromMenuTop = activeTile.offsetTop - this.calcScrollPosition();
            var firstTileOffsetTop = $el.querySelector('.v-list__tile').offsetTop;
            return this.computedTop - tileDistanceFromMenuTop - firstTileOffsetTop;
        }
    }
};
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