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Styles\nimport '../../stylus/components/_item-group.styl'\n\n// Mixins\nimport Groupable from '../../mixins/groupable'\nimport Proxyable from '../../mixins/proxyable'\nimport Themeable from '../../mixins/themeable'\n\n// Utilities\nimport mixins from '../../util/mixins'\nimport { consoleWarn } from '../../util/console'\n\n// Types\nimport { VNode } from 'vue/types'\n\ntype GroupableInstance = InstanceType<typeof Groupable> & { value?: any }\n\nexport const BaseItemGroup = mixins(\n  Proxyable,\n  Themeable\n).extend({\n  name: 'base-item-group',\n\n  props: {\n    activeClass: {\n      type: String,\n      default: 'v-item--active'\n    },\n    mandatory: Boolean,\n    max: {\n      type: [Number, String],\n      default: null\n    },\n    multiple: Boolean\n  },\n\n  data () {\n    return {\n      // As long as a value is defined, show it\n      // Otherwise, check if multiple\n      // to determine which default to provide\n      internalLazyValue: this.value !== undefined\n        ? this.value\n        : this.multiple ? [] : undefined,\n      items: [] as GroupableInstance[]\n    }\n  },\n\n  computed: {\n    classes (): Record<string, boolean> {\n      return {\n        ...this.themeClasses\n      }\n    },\n    selectedItems (): GroupableInstance[] {\n      return this.items.filter((item, index) => {\n        return this.toggleMethod(this.getValue(item, index))\n      })\n    },\n    selectedValues (): any[] {\n      return Array.isArray(this.internalValue)\n        ? this.internalValue\n        : [this.internalValue]\n    },\n    toggleMethod (): (v: any) => boolean {\n      if (!this.multiple) {\n        return (v: any) => this.internalValue === v\n      }\n\n      const internalValue = this.internalValue\n      if (Array.isArray(internalValue)) {\n        return (v: any) => internalValue.includes(v)\n      }\n\n      return () => false\n    }\n  },\n\n  watch: {\n    internalValue () {\n      // https://github.com/vuetifyjs/vuetify/issues/5352\n      this.$nextTick(this.updateItemsState)\n    }\n  },\n\n  created () {\n    if (this.multiple && !Array.isArray(this.internalValue)) {\n      consoleWarn('Model must be bound to an array if the multiple property is true.', this)\n    }\n  },\n\n  methods: {\n    getValue (item: GroupableInstance, i: number): unknown {\n      return item.value == null || item.value === ''\n        ? i\n        : item.value\n    },\n    onClick (item: GroupableInstance, index: number) {\n      this.updateInternalValue(\n        this.getValue(item, index)\n      )\n    },\n    register (item: GroupableInstance) {\n      const index = this.items.push(item) - 1\n\n      item.$on('change', () => this.onClick(item, index))\n\n      // If no value provided and mandatory,\n      // assign first registered item\n      if (this.mandatory && this.internalLazyValue == null) {\n        this.updateMandatory()\n      }\n\n      this.updateItem(item, index)\n    },\n    unregister (item: GroupableInstance) {\n      if (this._isDestroyed) return\n\n      const index = this.items.indexOf(item)\n      const value = this.getValue(item, index)\n\n      this.items.splice(index, 1)\n\n      const valueIndex = this.selectedValues.indexOf(value)\n\n      // Items is not selected, do nothing\n      if (valueIndex < 0) return\n\n      // If not mandatory, use regular update process\n      if (!this.mandatory) {\n        return this.updateInternalValue(value)\n      }\n\n      // Remove the value\n      if (this.multiple && Array.isArray(this.internalValue)) {\n        this.internalValue = this.internalValue.filter(v => v !== value)\n      } else {\n        this.internalValue = undefined\n      }\n\n      // If mandatory and we have no selection\n      // add the last item as value\n      /* istanbul ignore else */\n      if (!this.selectedItems.length) {\n        this.updateMandatory(true)\n      }\n    },\n    updateItem (item: GroupableInstance, index: number) {\n      const value = this.getValue(item, index)\n\n      item.isActive = this.toggleMethod(value)\n    },\n    updateItemsState () {\n      if (this.mandatory &&\n        !this.selectedItems.length\n      ) {\n        return this.updateMandatory()\n      }\n\n      // TODO: Make this smarter so it\n      // doesn't have to iterate every\n      // child in an update\n      this.items.forEach(this.updateItem)\n    },\n    updateInternalValue (value: any) {\n      this.multiple\n        ? this.updateMultiple(value)\n        : this.updateSingle(value)\n    },\n    updateMandatory (last?: boolean) {\n      if (!this.items.length) return\n\n      const index = last ? this.items.length - 1 : 0\n\n      this.updateInternalValue(\n        this.getValue(this.items[index], index)\n      )\n    },\n    updateMultiple (value: any) {\n      const defaultValue = Array.isArray(this.internalValue)\n        ? this.internalValue\n        : []\n      const internalValue = defaultValue.slice()\n      const index = internalValue.findIndex(val => val === value)\n\n      if (\n        this.mandatory &&\n        // Item already exists\n        index > -1 &&\n        // value would be reduced below min\n        internalValue.length - 1 < 1\n      ) return\n\n      if (\n        // Max is set\n        this.max != null &&\n        // Item doesn't exist\n        index < 0 &&\n        // value would be increased above max\n        internalValue.length + 1 > this.max\n      ) return\n\n      index > -1\n        ? internalValue.splice(index, 1)\n        : internalValue.push(value)\n\n      this.internalValue = internalValue\n    },\n    updateSingle (value: any) {\n      const isSame = value === this.internalValue\n\n      if (this.mandatory && isSame) return\n\n      this.internalValue = isSame ? undefined : value\n    }\n  },\n\n  render (h): VNode {\n    return h('div', {\n      staticClass: 'v-item-group',\n      class: this.classes\n    }, this.$slots.default)\n  }\n})\n\nexport default BaseItemGroup.extend({\n  name: 'v-item-group',\n\n  provide (): object {\n    return {\n      itemGroup: this\n    }\n  }\n})\n"],"sourceRoot":""}