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index.js
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index.js
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/*global __PATH_PREFIX__ */
import PropTypes from "prop-types"
import React from "react"
import { Link, Location } from "@reach/router"
import { parsePath } from "gatsby"
export function withPrefix(path) {
return normalizePath(`${__PATH_PREFIX__}/${path}`)
}
function normalizePath(path) {
return path.replace(/\/+/g, `/`)
}
const NavLinkPropTypes = {
activeClassName: PropTypes.string,
activeStyle: PropTypes.object,
}
// Set up IntersectionObserver
const handleIntersection = (el, cb) => {
const io = new window.IntersectionObserver(entries => {
entries.forEach(entry => {
if (el === entry.target) {
// Check if element is within viewport, remove listener, destroy observer, and run link callback.
// MSEdge doesn't currently support isIntersecting, so also test for an intersectionRatio > 0
if (entry.isIntersecting || entry.intersectionRatio > 0) {
io.unobserve(el)
io.disconnect()
cb()
}
}
})
})
// Add element to the observer
io.observe(el)
}
class GatsbyLink extends React.Component {
constructor(props) {
super()
// Default to no support for IntersectionObserver
let IOSupported = false
if (typeof window !== `undefined` && window.IntersectionObserver) {
IOSupported = true
}
const { location } = props
this.state = {
IOSupported,
location,
}
this.handleRef = this.handleRef.bind(this)
}
componentDidUpdate(prevProps, prevState) {
// Preserve non IO functionality if no support
if (this.props.to !== prevProps.to && !this.state.IOSupported) {
___loader.enqueue(parsePath(this.props.to).pathname)
}
}
componentDidMount() {
// Preserve non IO functionality if no support
if (!this.state.IOSupported) {
___loader.enqueue(parsePath(this.props.to).pathname)
}
}
handleRef(ref) {
this.props.innerRef && this.props.innerRef(ref)
if (this.state.IOSupported && ref) {
// If IO supported and element reference found, setup Observer functionality
handleIntersection(ref, () => {
___loader.enqueue(parsePath(this.props.to).pathname)
})
}
}
defaultGetProps = ({ isCurrent }) => {
if (isCurrent) {
return {
className: [this.props.className, this.props.activeClassName]
.filter(Boolean)
.join(` `),
style: { ...this.props.style, ...this.props.activeStyle },
}
}
return null
}
render() {
const {
to,
getProps = this.defaultGetProps,
onClick,
onMouseEnter,
location,
/* eslint-disable no-unused-vars */
activeClassName: $activeClassName,
activeStyle: $activeStyle,
ref: $ref,
innerRef: $innerRef,
state,
replace,
/* eslint-enable no-unused-vars */
...rest
} = this.props
const prefixedTo = withPrefix(to)
return (
<Link
to={prefixedTo}
state={state}
getProps={getProps}
innerRef={this.handleRef}
onMouseEnter={e => {
// eslint-disable-line
onMouseEnter && onMouseEnter(e)
___loader.hovering(parsePath(to).pathname)
}}
onClick={e => {
// eslint-disable-line
onClick && onClick(e)
if (
e.button === 0 && // ignore right clicks
!this.props.target && // let browser handle "target=_blank"
!e.defaultPrevented && // onClick prevented default
!e.metaKey && // ignore clicks with modifier keys...
!e.altKey &&
!e.ctrlKey &&
!e.shiftKey
) {
e.preventDefault()
// Is this link pointing to a hash on the same page? If so,
// just scroll there.
const { pathname, hash } = parsePath(prefixedTo)
if (pathname === location.pathname || !pathname) {
const element = hash
? document.getElementById(hash.substr(1))
: null
if (element !== null) {
element.scrollIntoView()
} else {
// This is just a normal link to the current page so let's emulate default
// browser behavior by scrolling now to the top of the page.
window.scrollTo(0, 0)
}
}
// Make sure the necessary scripts and data are
// loaded before continuing.
navigate(to, { state, replace })
}
return true
}}
{...rest}
/>
)
}
}
GatsbyLink.propTypes = {
...NavLinkPropTypes,
innerRef: PropTypes.func,
onClick: PropTypes.func,
to: PropTypes.string.isRequired,
replace: PropTypes.bool,
}
// eslint-disable-next-line react/display-name
const withLocation = Comp => props => (
<Location>
{({ location }) => <Comp location={location} {...props} />}
</Location>
)
export default withLocation(GatsbyLink)
export const navigate = (to, options) => {
window.___navigate(withPrefix(to), options)
}
export const push = to => {
console.warn(
`The "push" method is now deprecated and will be removed in Gatsby v3. Please use "navigate" instead.`
)
window.___push(withPrefix(to))
}
export const replace = to => {
console.warn(
`The "replace" method is now deprecated and will be removed in Gatsby v3. Please use "navigate" instead.`
)
window.___replace(withPrefix(to))
}
// TODO: Remove navigateTo for Gatsby v3
export const navigateTo = to => {
console.warn(
`The "navigateTo" method is now deprecated and will be removed in Gatsby v3. Please use "push" instead.`
)
return push(to)
}