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'../../stylus/components/_date-picker-header.styl'\n\n// Components\nimport VBtn from '../VBtn'\nimport VIcon from '../VIcon'\n\n// Mixins\nimport Colorable from '../../mixins/colorable'\nimport Themeable from '../../mixins/themeable'\n\n// Utils\nimport { createNativeLocaleFormatter, monthChange } from './util'\nimport mixins from '../../util/mixins'\n\n// Types\nimport { VNode } from 'vue'\nimport { DatePickerFormatter } from './util/createNativeLocaleFormatter'\nimport { PropValidator } from 'vue/types/options'\n\nexport default mixins(\n  Colorable,\n  Themeable\n/* @vue/component */\n).extend({\n  name: 'v-date-picker-header',\n\n  props: {\n    disabled: Boolean,\n    format: Function as PropValidator<DatePickerFormatter | undefined>,\n    locale: {\n      type: String,\n      default: 'en-us'\n    },\n    min: String,\n    max: String,\n    nextIcon: {\n      type: String,\n      default: '$vuetify.icons.next'\n    },\n    prevIcon: {\n      type: String,\n      default: '$vuetify.icons.prev'\n    },\n    readonly: Boolean,\n    value: {\n      type: [Number, String],\n      required: true\n    }\n  },\n\n  data () {\n    return {\n      isReversing: false\n    }\n  },\n\n  computed: {\n    formatter (): DatePickerFormatter {\n      if (this.format) {\n        return this.format\n      } else if (String(this.value).split('-')[1]) {\n        return createNativeLocaleFormatter(this.locale, { month: 'long', year: 'numeric', timeZone: 'UTC' }, { length: 7 })\n      } else {\n        return createNativeLocaleFormatter(this.locale, { year: 'numeric', timeZone: 'UTC' }, { length: 4 })\n      }\n    }\n  },\n\n  watch: {\n    value (newVal, oldVal) {\n      this.isReversing = newVal < oldVal\n    }\n  },\n\n  methods: {\n    genBtn (change: number) {\n      const disabled = this.disabled ||\n        (change < 0 && this.min && this.calculateChange(change) < this.min) ||\n        (change > 0 && this.max && this.calculateChange(change) > this.max)\n\n      return this.$createElement(VBtn, {\n        props: {\n          dark: this.dark,\n          disabled,\n          icon: true,\n          light: this.light\n        },\n        nativeOn: {\n          click: (e: Event) => {\n            e.stopPropagation()\n            this.$emit('input', this.calculateChange(change))\n          }\n        }\n      }, [\n        this.$createElement(VIcon, ((change < 0) === !this.$vuetify.rtl) ? this.prevIcon : this.nextIcon)\n      ])\n    },\n    calculateChange (sign: number) {\n      const [year, month] = String(this.value).split('-').map(Number)\n\n      if (month == null) {\n        return `${year + sign}`\n      } else {\n        return monthChange(String(this.value), sign)\n      }\n    },\n    genHeader () {\n      const color = !this.disabled && (this.color || 'accent')\n      const header = this.$createElement('div', this.setTextColor(color, {\n        key: String(this.value)\n      }), [this.$createElement('button', {\n        attrs: {\n          type: 'button'\n        },\n        on: {\n          click: () => this.$emit('toggle')\n        }\n      }, [this.$slots.default || this.formatter(String(this.value))])])\n\n      const transition = this.$createElement('transition', {\n        props: {\n          name: (this.isReversing === !this.$vuetify.rtl) ? 'tab-reverse-transition' : 'tab-transition'\n        }\n      }, [header])\n\n      return this.$createElement('div', {\n        staticClass: 'v-date-picker-header__value',\n        class: {\n          'v-date-picker-header__value--disabled': this.disabled\n        }\n      }, [transition])\n    }\n  },\n\n  render (): VNode {\n    return this.$createElement('div', {\n      staticClass: 'v-date-picker-header',\n      class: {\n        'v-date-picker-header--disabled': this.disabled,\n        ...this.themeClasses\n      }\n    }, [\n      this.genBtn(-1),\n      this.genHeader(),\n      this.genBtn(+1)\n    ])\n  }\n})\n"],"sourceRoot":""}