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<template>
<div
v-if="prev || next"
class="page-nav"
>
<p class="inner">
<span
v-if="prev"
class="prev"
>
←
<a
v-if="prev.type === 'external'"
class="prev"
:href="prev.path"
target="_blank"
rel="noopener noreferrer"
>
{{ prev.title || prev.path }}
<OutboundLink />
</a>
<RouterLink
v-else
class="prev"
:to="prev.path"
>
{{ prev.title || prev.path }}
</RouterLink>
</span>
<span
v-if="next"
class="next"
>
<a
v-if="next.type === 'external'"
:href="next.path"
target="_blank"
rel="noopener noreferrer"
>
{{ next.title || next.path }}
<OutboundLink />
</a>
<RouterLink
v-else
:to="next.path"
>
{{ next.title || next.path }}
</RouterLink>
→
</span>
</p>
</div>
</template>
<script>
import { resolvePage } from '../util'
import isString from 'lodash/isString'
import isNil from 'lodash/isNil'
export default {
name: 'PageNav',
props: ['sidebarItems'],
computed: {
prev () {
return resolvePageLink(LINK_TYPES.PREV, this)
},
next () {
return resolvePageLink(LINK_TYPES.NEXT, this)
}
}
}
function resolvePrev (page, items) {
return find(page, items, -1)
}
function resolveNext (page, items) {
return find(page, items, 1)
}
const LINK_TYPES = {
NEXT: {
resolveLink: resolveNext,
getThemeLinkConfig: ({ nextLinks }) => nextLinks,
getPageLinkConfig: ({ frontmatter }) => frontmatter.next
},
PREV: {
resolveLink: resolvePrev,
getThemeLinkConfig: ({ prevLinks }) => prevLinks,
getPageLinkConfig: ({ frontmatter }) => frontmatter.prev
}
}
function resolvePageLink (
linkType,
{ $themeConfig, $page, $route, $site, sidebarItems }
) {
const { resolveLink, getThemeLinkConfig, getPageLinkConfig } = linkType
// Get link config from theme
const themeLinkConfig = getThemeLinkConfig($themeConfig)
// Get link config from current page
const pageLinkConfig = getPageLinkConfig($page)
// Page link config will overwrite global theme link config if defined
const link = isNil(pageLinkConfig) ? themeLinkConfig : pageLinkConfig
if (link === false) {
return
} else if (isString(link)) {
return resolvePage($site.pages, link, $route.path)
} else {
return resolveLink($page, sidebarItems)
}
}
function find (page, items, offset) {
const res = []
flatten(items, res)
for (let i = 0; i < res.length; i++) {
const cur = res[i]
if (cur.type === 'page' && cur.path === decodeURIComponent(page.path)) {
return res[i + offset]
}
}
}
function flatten (items, res) {
for (let i = 0, l = items.length; i < l; i++) {
if (items[i].type === 'group') {
flatten(items[i].children || [], res)
} else {
res.push(items[i])
}
}
}
</script>
<style lang="stylus">
@require '../styles/wrapper.styl'
.page-nav
@extend $wrapper
padding-top 1rem
padding-bottom 0
.inner
min-height 2rem
margin-top 0
border-top 1px solid $borderColor
padding-top 1rem
overflow auto // clear float
.next
float right
</style>
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