om/node_modules/vuetify/lib/components/VStepper/VStepperContent.js

// Components
import { VTabTransition, VTabReverseTransition } from '../transitions';
// Mixins
import { inject as RegistrableInject } from '../../mixins/registrable';
// Helpers
import { convertToUnit } from '../../util/helpers';
// Util
import mixins from '../../util/mixins';
export default mixins(RegistrableInject('stepper', 'v-stepper-content', 'v-stepper')
/* @vue/component */
).extend({
    name: 'v-stepper-content',
    inject: {
        isVerticalProvided: {
            from: 'isVertical'
        }
    },
    props: {
        step: {
            type: [Number, String],
            required: true
        }
    },
    data: function data() {
        return {
            height: 0,
            // Must be null to allow
            // previous comparison
            isActive: null,
            isReverse: false,
            isVertical: this.isVerticalProvided
        };
    },

    computed: {
        classes: function classes() {
            return {
                'v-stepper__content': true
            };
        },
        computedTransition: function computedTransition() {
            return this.isReverse ? VTabReverseTransition : VTabTransition;
        },
        styles: function styles() {
            if (!this.isVertical) return {};
            return {
                height: convertToUnit(this.height)
            };
        },
        wrapperClasses: function wrapperClasses() {
            return {
                'v-stepper__wrapper': true
            };
        }
    },
    watch: {
        isActive: function isActive(current, previous) {
            // If active and the previous state
            // was null, is just booting up
            if (current && previous == null) {
                this.height = 'auto';
                return;
            }
            if (!this.isVertical) return;
            if (this.isActive) this.enter();else this.leave();
        }
    },
    mounted: function mounted() {
        this.$refs.wrapper.addEventListener('transitionend', this.onTransition, false);
        this.stepper && this.stepper.register(this);
    },
    beforeDestroy: function beforeDestroy() {
        this.$refs.wrapper.removeEventListener('transitionend', this.onTransition, false);
        this.stepper && this.stepper.unregister(this);
    },

    methods: {
        onTransition: function onTransition(e) {
            if (!this.isActive || e.propertyName !== 'height') return;
            this.height = 'auto';
        },
        enter: function enter() {
            var _this = this;

            var scrollHeight = 0;
            // Render bug with height
            requestAnimationFrame(function () {
                scrollHeight = _this.$refs.wrapper.scrollHeight;
            });
            this.height = 0;
            // Give the collapsing element time to collapse
            setTimeout(function () {
                return _this.isActive && (_this.height = scrollHeight || 'auto');
            }, 450);
        },
        leave: function leave() {
            var _this2 = this;

            this.height = this.$refs.wrapper.clientHeight;
            setTimeout(function () {
                return _this2.height = 0;
            }, 10);
        },
        toggle: function toggle(step, reverse) {
            this.isActive = step.toString() === this.step.toString();
            this.isReverse = reverse;
        }
    },
    render: function render(h) {
        var contentData = {
            'class': this.classes
        };
        var wrapperData = {
            'class': this.wrapperClasses,
            style: this.styles,
            ref: 'wrapper'
        };
        if (!this.isVertical) {
            contentData.directives = [{
                name: 'show',
                value: this.isActive
            }];
        }
        var wrapper = h('div', wrapperData, [this.$slots.default]);
        var content = h('div', contentData, [wrapper]);
        return h(this.computedTransition, {
            on: this.$listeners
        }, [content]);
    }
});
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