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VTabReverseTransition\n : VTabTransition\n },\n styles (): object {\n if (!this.isVertical) return {}\n\n return {\n height: convertToUnit(this.height)\n }\n },\n wrapperClasses (): object {\n return {\n 'v-stepper__wrapper': true\n }\n }\n },\n\n watch: {\n isActive (current, previous) {\n // If active and the previous state\n // was null, is just booting up\n if (current && previous == null) {\n this.height = 'auto'\n return\n }\n\n if (!this.isVertical) return\n\n if (this.isActive) this.enter()\n else this.leave()\n }\n },\n\n mounted () {\n this.$refs.wrapper.addEventListener(\n 'transitionend',\n this.onTransition,\n false\n )\n this.stepper && this.stepper.register(this)\n },\n\n beforeDestroy () {\n this.$refs.wrapper.removeEventListener(\n 'transitionend',\n this.onTransition,\n false\n )\n this.stepper && this.stepper.unregister(this)\n },\n\n methods: {\n onTransition (e: TransitionEvent) {\n if (!this.isActive ||\n e.propertyName !== 'height'\n ) return\n\n this.height = 'auto'\n },\n enter () {\n let scrollHeight = 0\n\n // Render bug with height\n requestAnimationFrame(() => {\n scrollHeight = this.$refs.wrapper.scrollHeight\n })\n\n this.height = 0\n\n // Give the collapsing element time to collapse\n setTimeout(() => this.isActive && (this.height = (scrollHeight || 'auto')), 450)\n },\n leave () {\n this.height = this.$refs.wrapper.clientHeight\n setTimeout(() => (this.height = 0), 10)\n },\n toggle (step: string | number, reverse: boolean) {\n this.isActive = step.toString() === this.step.toString()\n this.isReverse = reverse\n }\n },\n\n render (h): VNode {\n const contentData: VNodeData = {\n 'class': this.classes\n }\n const wrapperData = {\n 'class': this.wrapperClasses,\n style: this.styles,\n ref: 'wrapper'\n }\n\n if (!this.isVertical) {\n contentData.directives = [{\n name: 'show',\n value: this.isActive\n }]\n }\n\n const wrapper = h('div', wrapperData, [this.$slots.default])\n const content = h('div', contentData, [wrapper])\n\n return h(this.computedTransition, {\n on: this.$listeners\n }, [content])\n }\n})\n"],"sourceRoot":""}
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