/
tab-nav.tsx
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/
tab-nav.tsx
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// @ts-nocheck
import {
computed,
defineComponent,
getCurrentInstance,
inject,
nextTick,
onMounted,
onUpdated,
ref,
watch,
} from 'vue'
import { NOOP } from '@vue/shared'
import {
useDocumentVisibility,
useResizeObserver,
useWindowFocus,
} from '@vueuse/core'
import {
buildProps,
capitalize,
definePropType,
mutable,
throwError,
} from '@element-plus/utils'
import { EVENT_CODE } from '@element-plus/constants'
import { ElIcon } from '@element-plus/components/icon'
import { ArrowLeft, ArrowRight, Close } from '@element-plus/icons-vue'
import { tabsRootContextKey } from '@element-plus/tokens'
import { useNamespace } from '@element-plus/hooks'
import TabBar from './tab-bar.vue'
import type { CSSProperties, ExtractPropTypes } from 'vue'
import type { TabsPaneContext } from '@element-plus/tokens'
import type { TabPanelName } from './tabs'
interface Scrollable {
next?: boolean
prev?: number
}
export const tabNavProps = buildProps({
panes: {
type: definePropType<TabsPaneContext[]>(Array),
default: () => mutable([] as const),
},
currentName: {
type: [String, Number],
default: '',
},
editable: Boolean,
onTabClick: {
type: definePropType<
(tab: TabsPaneContext, tabName: TabPanelName, ev: Event) => void
>(Function),
default: NOOP,
},
onTabRemove: {
type: definePropType<(tab: TabsPaneContext, ev: Event) => void>(Function),
default: NOOP,
},
type: {
type: String,
values: ['card', 'border-card', ''],
default: '',
},
stretch: Boolean,
} as const)
export type TabNavProps = ExtractPropTypes<typeof tabNavProps>
const COMPONENT_NAME = 'ElTabNav'
const TabNav = defineComponent({
name: COMPONENT_NAME,
props: tabNavProps,
setup(props, { expose }) {
const vm = getCurrentInstance()!
const rootTabs = inject(tabsRootContextKey)
if (!rootTabs) throwError(COMPONENT_NAME, `<el-tabs><tab-nav /></el-tabs>`)
const ns = useNamespace('tabs')
const visibility = useDocumentVisibility()
const focused = useWindowFocus()
const navScroll$ = ref<HTMLDivElement>()
const nav$ = ref<HTMLDivElement>()
const el$ = ref<HTMLDivElement>()
const scrollable = ref<false | Scrollable>(false)
const navOffset = ref(0)
const isFocus = ref(false)
const focusable = ref(true)
const sizeName = computed(() =>
['top', 'bottom'].includes(rootTabs.props.tabPosition)
? 'width'
: 'height'
)
const navStyle = computed<CSSProperties>(() => {
const dir = sizeName.value === 'width' ? 'X' : 'Y'
return {
transform: `translate${dir}(-${navOffset.value}px)`,
}
})
const scrollPrev = () => {
if (!navScroll$.value) return
const containerSize =
navScroll$.value[`offset${capitalize(sizeName.value)}`]
const currentOffset = navOffset.value
if (!currentOffset) return
const newOffset =
currentOffset > containerSize ? currentOffset - containerSize : 0
navOffset.value = newOffset
}
const scrollNext = () => {
if (!navScroll$.value || !nav$.value) return
const navSize = nav$.value[`offset${capitalize(sizeName.value)}`]
const containerSize =
navScroll$.value[`offset${capitalize(sizeName.value)}`]
const currentOffset = navOffset.value
if (navSize - currentOffset <= containerSize) return
const newOffset =
navSize - currentOffset > containerSize * 2
? currentOffset + containerSize
: navSize - containerSize
navOffset.value = newOffset
}
const scrollToActiveTab = async () => {
const nav = nav$.value
if (!scrollable.value || !el$.value || !navScroll$.value || !nav) return
await nextTick()
const activeTab = el$.value.querySelector('.is-active')
if (!activeTab) return
const navScroll = navScroll$.value
const isHorizontal = ['top', 'bottom'].includes(
rootTabs.props.tabPosition
)
const activeTabBounding = activeTab.getBoundingClientRect()
const navScrollBounding = navScroll.getBoundingClientRect()
const maxOffset = isHorizontal
? nav.offsetWidth - navScrollBounding.width
: nav.offsetHeight - navScrollBounding.height
const currentOffset = navOffset.value
let newOffset = currentOffset
if (isHorizontal) {
if (activeTabBounding.left < navScrollBounding.left) {
newOffset =
currentOffset - (navScrollBounding.left - activeTabBounding.left)
}
if (activeTabBounding.right > navScrollBounding.right) {
newOffset =
currentOffset + activeTabBounding.right - navScrollBounding.right
}
} else {
if (activeTabBounding.top < navScrollBounding.top) {
newOffset =
currentOffset - (navScrollBounding.top - activeTabBounding.top)
}
if (activeTabBounding.bottom > navScrollBounding.bottom) {
newOffset =
currentOffset +
(activeTabBounding.bottom - navScrollBounding.bottom)
}
}
newOffset = Math.max(newOffset, 0)
navOffset.value = Math.min(newOffset, maxOffset)
}
const update = () => {
if (!nav$.value || !navScroll$.value) return
const navSize = nav$.value[`offset${capitalize(sizeName.value)}`]
const containerSize =
navScroll$.value[`offset${capitalize(sizeName.value)}`]
const currentOffset = navOffset.value
if (containerSize < navSize) {
const currentOffset = navOffset.value
scrollable.value = scrollable.value || {}
scrollable.value.prev = currentOffset
scrollable.value.next = currentOffset + containerSize < navSize
if (navSize - currentOffset < containerSize) {
navOffset.value = navSize - containerSize
}
} else {
scrollable.value = false
if (currentOffset > 0) {
navOffset.value = 0
}
}
}
const changeTab = (e: KeyboardEvent) => {
const code = e.code
const { up, down, left, right } = EVENT_CODE
if (![up, down, left, right].includes(code)) return
// 左右上下键更换tab
const tabList = Array.from(
(e.currentTarget as HTMLDivElement).querySelectorAll<HTMLDivElement>(
'[role=tab]'
)
)
const currentIndex = tabList.indexOf(e.target as HTMLDivElement)
let nextIndex: number
if (code === left || code === up) {
// left
if (currentIndex === 0) {
// first
nextIndex = tabList.length - 1
} else {
nextIndex = currentIndex - 1
}
} else {
// right
if (currentIndex < tabList.length - 1) {
// not last
nextIndex = currentIndex + 1
} else {
nextIndex = 0
}
}
tabList[nextIndex].focus() // 改变焦点元素
tabList[nextIndex].click() // 选中下一个tab
setFocus()
}
const setFocus = () => {
if (focusable.value) isFocus.value = true
}
const removeFocus = () => (isFocus.value = false)
watch(visibility, (visibility) => {
if (visibility === 'hidden') {
focusable.value = false
} else if (visibility === 'visible') {
setTimeout(() => (focusable.value = true), 50)
}
})
watch(focused, (focused) => {
if (focused) {
setTimeout(() => (focusable.value = true), 50)
} else {
focusable.value = false
}
})
useResizeObserver(el$, update)
onMounted(() => setTimeout(() => scrollToActiveTab(), 0))
onUpdated(() => update())
expose({
scrollToActiveTab,
removeFocus,
})
watch(
() => props.panes,
() => vm.update(),
{ flush: 'post' }
)
return () => {
const scrollBtn = scrollable.value
? [
<span
class={[
ns.e('nav-prev'),
ns.is('disabled', !scrollable.value.prev),
]}
onClick={scrollPrev}
>
<ElIcon>
<ArrowLeft />
</ElIcon>
</span>,
<span
class={[
ns.e('nav-next'),
ns.is('disabled', !scrollable.value.next),
]}
onClick={scrollNext}
>
<ElIcon>
<ArrowRight />
</ElIcon>
</span>,
]
: null
const tabs = props.panes.map((pane, index) => {
const tabName = pane.props.name ?? pane.index ?? `${index}`
const closable: boolean = pane.isClosable || props.editable
pane.index = `${index}`
const btnClose = closable ? (
<ElIcon
class="is-icon-close"
// `onClick` not exist when generate dts
// eslint-disable-next-line @typescript-eslint/ban-ts-comment
// @ts-ignore
onClick={(ev: MouseEvent) => props.onTabRemove(pane, ev)}
>
<Close />
</ElIcon>
) : null
const tabLabelContent = pane.slots.label?.() || pane.props.label
const tabindex = pane.active ? 0 : -1
return (
<div
ref={`tab-${tabName}`}
class={[
ns.e('item'),
ns.is(rootTabs.props.tabPosition),
ns.is('active', pane.active),
ns.is('disabled', pane.props.disabled),
ns.is('closable', closable),
ns.is('focus', isFocus.value),
]}
id={`tab-${tabName}`}
key={`tab-${tabName}`}
aria-controls={`pane-${tabName}`}
role="tab"
aria-selected={pane.active}
tabindex={tabindex}
onFocus={() => setFocus()}
onBlur={() => removeFocus()}
onClick={(ev: MouseEvent) => {
removeFocus()
props.onTabClick(pane, tabName, ev)
}}
onKeydown={(ev: KeyboardEvent) => {
if (
closable &&
(ev.code === EVENT_CODE.delete ||
ev.code === EVENT_CODE.backspace)
) {
props.onTabRemove(pane, ev)
}
}}
>
{...[tabLabelContent, btnClose]}
</div>
)
})
return (
<div
ref={el$}
class={[
ns.e('nav-wrap'),
ns.is('scrollable', !!scrollable.value),
ns.is(rootTabs.props.tabPosition),
]}
>
{scrollBtn}
<div class={ns.e('nav-scroll')} ref={navScroll$}>
<div
class={[
ns.e('nav'),
ns.is(rootTabs.props.tabPosition),
ns.is(
'stretch',
props.stretch &&
['top', 'bottom'].includes(rootTabs.props.tabPosition)
),
]}
ref={nav$}
style={navStyle.value}
role="tablist"
onKeydown={changeTab}
>
{...[
!props.type ? <TabBar tabs={[...props.panes]} /> : null,
tabs,
]}
</div>
</div>
</div>
)
}
},
})
export type TabNavInstance = InstanceType<typeof TabNav>
export default TabNav