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refactor(components): [carousel-item] (#10219)
Co-authored-by: JeremyWuuuuu <15975785+JeremyWuuuuu@users.noreply.github.com>
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Original file line number | Diff line number | Diff line change |
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import type Carousel from './carousel.vue' | ||
import type CarouselItem from './carousel-item.vue' | ||
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export type CarouselInstance = InstanceType<typeof Carousel> | ||
export type CarouselItemInstance = InstanceType<typeof CarouselItem> |
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import { | ||
getCurrentInstance, | ||
inject, | ||
onMounted, | ||
onUnmounted, | ||
reactive, | ||
ref, | ||
unref, | ||
} from 'vue' | ||
import { debugWarn, isUndefined } from '@element-plus/utils' | ||
import { carouselContextKey } from '@element-plus/tokens' | ||
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import type { CarouselItemProps } from './carousel-item' | ||
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export const useCarouselItem = ( | ||
props: CarouselItemProps, | ||
componentName: string | ||
) => { | ||
const carouselContext = inject(carouselContextKey)! | ||
// instance | ||
const instance = getCurrentInstance()! | ||
if (!carouselContext) { | ||
debugWarn( | ||
componentName, | ||
'usage: <el-carousel></el-carousel-item></el-carousel>' | ||
) | ||
} | ||
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if (!instance) { | ||
debugWarn( | ||
componentName, | ||
'compositional hook can only be invoked inside setups' | ||
) | ||
} | ||
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const CARD_SCALE = 0.83 | ||
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const hover = ref(false) | ||
const translate = ref(0) | ||
const scale = ref(1) | ||
const active = ref(false) | ||
const ready = ref(false) | ||
const inStage = ref(false) | ||
const animating = ref(false) | ||
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// computed | ||
const { isCardType, isVertical } = carouselContext | ||
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// methods | ||
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function processIndex(index: number, activeIndex: number, length: number) { | ||
const lastItemIndex = length - 1 | ||
const prevItemIndex = activeIndex - 1 | ||
const nextItemIndex = activeIndex + 1 | ||
const halfItemIndex = length / 2 | ||
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if (activeIndex === 0 && index === lastItemIndex) { | ||
return -1 | ||
} else if (activeIndex === lastItemIndex && index === 0) { | ||
return length | ||
} else if (index < prevItemIndex && activeIndex - index >= halfItemIndex) { | ||
return length + 1 | ||
} else if (index > nextItemIndex && index - activeIndex >= halfItemIndex) { | ||
return -2 | ||
} | ||
return index | ||
} | ||
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function calcCardTranslate(index: number, activeIndex: number) { | ||
const parentWidth = carouselContext.root.value?.offsetWidth || 0 | ||
if (inStage.value) { | ||
return (parentWidth * ((2 - CARD_SCALE) * (index - activeIndex) + 1)) / 4 | ||
} else if (index < activeIndex) { | ||
return (-(1 + CARD_SCALE) * parentWidth) / 4 | ||
} else { | ||
return ((3 + CARD_SCALE) * parentWidth) / 4 | ||
} | ||
} | ||
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function calcTranslate( | ||
index: number, | ||
activeIndex: number, | ||
isVertical: boolean | ||
) { | ||
const rootEl = carouselContext.root.value | ||
if (!rootEl) return 0 | ||
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const distance = | ||
(isVertical ? rootEl.offsetHeight : rootEl.offsetWidth) || 0 | ||
return distance * (index - activeIndex) | ||
} | ||
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const translateItem = ( | ||
index: number, | ||
activeIndex: number, | ||
oldIndex?: number | ||
) => { | ||
const _isCardType = unref(isCardType) | ||
const carouselItemLength = carouselContext.items.value.length ?? Number.NaN | ||
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const isActive = index === activeIndex | ||
if (!_isCardType && !isUndefined(oldIndex)) { | ||
animating.value = isActive || index === oldIndex | ||
} | ||
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if (!isActive && carouselItemLength > 2 && carouselContext.loop) { | ||
index = processIndex(index, activeIndex, carouselItemLength) | ||
} | ||
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const _isVertical = unref(isVertical) | ||
active.value = isActive | ||
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if (_isCardType) { | ||
if (_isVertical) { | ||
debugWarn( | ||
'Carousel', | ||
'vertical direction is not supported for card mode' | ||
) | ||
} | ||
inStage.value = Math.round(Math.abs(index - activeIndex)) <= 1 | ||
translate.value = calcCardTranslate(index, activeIndex) | ||
scale.value = unref(active) ? 1 : CARD_SCALE | ||
} else { | ||
translate.value = calcTranslate(index, activeIndex, _isVertical) | ||
} | ||
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ready.value = true | ||
} | ||
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function handleItemClick() { | ||
if (carouselContext && unref(isCardType)) { | ||
const index = carouselContext.items.value.findIndex( | ||
({ uid }) => uid === instance.uid | ||
) | ||
carouselContext.setActiveItem(index) | ||
} | ||
} | ||
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// lifecycle | ||
onMounted(() => { | ||
carouselContext.addItem({ | ||
props, | ||
states: reactive({ | ||
hover, | ||
translate, | ||
scale, | ||
active, | ||
ready, | ||
inStage, | ||
animating, | ||
}), | ||
uid: instance.uid, | ||
translateItem, | ||
}) | ||
}) | ||
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onUnmounted(() => { | ||
carouselContext.removeItem(instance.uid) | ||
}) | ||
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return { | ||
active, | ||
animating, | ||
hover, | ||
inStage, | ||
isVertical, | ||
translate, | ||
isCardType, | ||
scale, | ||
ready, | ||
handleItemClick, | ||
} | ||
} |