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navigation.ts
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navigation.ts
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import {
attachListener,
detachListener
} from '../core/render/dom'
import { SwiperInstance, SwiperPlugin } from '../core/index'
import { Options } from '../core/options'
export type SwiperPluginNavigationOptions = {
nextEl: HTMLElement | string
prevEl: HTMLElement | string
disabledClass: string
}
export type SwiperPluginNavigationPartialOptions = Partial<SwiperPluginNavigationOptions>
export type SwiperPluginNavigationInstance = {
nextEl?: HTMLElement
prevEl?: HTMLElement
}
export default <SwiperPlugin>function SwiperPluginNavigation (
instance: SwiperInstance & {
navigation?: SwiperPluginNavigationInstance
},
options: Options & {
navigation?: SwiperPluginNavigationPartialOptions
}
) {
const isEnable = Boolean(options.navigation)
const navigationInstance = {
nextEl: null,
prevEl: null
} as unknown as SwiperPluginNavigationInstance
const navigationOptions = <SwiperPluginNavigationOptions>Object.assign({
disabledClass: 'swiper-button-disabled'
}, options.navigation)
const nextClickHandler = (e: PointerEvent) => {
clickHandler(e.target as HTMLElement, 'next')
}
const prevClickHandler = (e: PointerEvent) => {
clickHandler(e.target as HTMLElement, 'prev')
}
const clickHandler = (e: HTMLElement, type: 'next' | 'prev') => {
if (checkIsDisable(e) && !instance.options.loop) {
return
}
const {
index
} = instance.state
if (type === 'next') {
instance.slideTo(index + 1)
}
if (type === 'prev') {
instance.slideTo(index - 1)
}
}
const checkNavBtnDisabledClass = (index: number) => {
const {
minIndex,
maxIndex
} = instance.env.limitation
if (
navigationInstance
&& navigationInstance!.prevEl
&& navigationInstance!.nextEl
) {
if (navigationInstance.nextEl.classList.contains(navigationOptions.disabledClass)
&& index > minIndex) {
navigationInstance.nextEl.classList.remove(navigationOptions.disabledClass)
}
if (navigationInstance.prevEl.classList.contains(navigationOptions.disabledClass)
&& index < maxIndex) {
navigationInstance.prevEl.classList.remove(navigationOptions.disabledClass)
}
if (index === minIndex) {
navigationInstance.prevEl.classList.add(navigationOptions.disabledClass)
}
if (index === maxIndex) {
navigationInstance.nextEl.classList.add(navigationOptions.disabledClass)
}
}
}
const checkIsDisable = (e: HTMLElement) => {
return e.classList.contains(navigationOptions.disabledClass)
}
const checkButtonDefaultStatus = () => {
const {
index
} = instance.state
const {
$list
} = instance.env.element
const {
minIndex
} = instance.env.limitation
if (index === minIndex
&& navigationInstance.prevEl
) {
navigationInstance.prevEl.classList.add(navigationOptions.disabledClass)
}
if ($list.length === minIndex
&& navigationInstance.nextEl
) {
navigationInstance.nextEl.classList.add(navigationOptions.disabledClass)
}
}
instance.on('before-slide', (currentIndex: number, state: never, newIndex: number) => {
if (!instance.options.loop) {
checkNavBtnDisabledClass(newIndex)
}
})
instance.on('after-init', () => {
if (!isEnable) return
navigationInstance.nextEl = (typeof navigationOptions.nextEl === 'string')
? document.body.querySelector(navigationOptions.nextEl) as HTMLElement
: navigationOptions.nextEl
navigationInstance.prevEl = (typeof navigationOptions.prevEl === 'string')
? document.body.querySelector(navigationOptions.prevEl) as HTMLElement
: navigationOptions.prevEl
if (!instance.options.loop) {
checkButtonDefaultStatus()
}
attachListener(<HTMLElement>navigationInstance.nextEl, 'click', <EventListener> nextClickHandler)
attachListener(<HTMLElement>navigationInstance.prevEl, 'click', <EventListener> prevClickHandler)
})
instance.on('after-destroy', () => {
if (navigationInstance
&& navigationInstance.prevEl
&& navigationInstance.nextEl
) {
detachListener(<HTMLElement>navigationInstance.nextEl, 'click', <EventListener> nextClickHandler)
detachListener(<HTMLElement>navigationInstance.prevEl, 'click', <EventListener> prevClickHandler)
delete navigationInstance.nextEl
delete navigationInstance.prevEl
}
})
}