236 lines
8 KiB
JavaScript
236 lines
8 KiB
JavaScript
'use strict'
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const { ipcMainInternal } = require('@electron/internal/browser/ipc-main-internal')
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// The history operation in renderer is redirected to browser.
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ipcMainInternal.on('ELECTRON_NAVIGATION_CONTROLLER_GO_BACK', function (event) {
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event.sender.goBack()
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})
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ipcMainInternal.on('ELECTRON_NAVIGATION_CONTROLLER_GO_FORWARD', function (event) {
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event.sender.goForward()
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})
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ipcMainInternal.on('ELECTRON_NAVIGATION_CONTROLLER_GO_TO_OFFSET', function (event, offset) {
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event.sender.goToOffset(offset)
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})
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ipcMainInternal.on('ELECTRON_NAVIGATION_CONTROLLER_LENGTH', function (event) {
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event.returnValue = event.sender.length()
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})
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// JavaScript implementation of Chromium's NavigationController.
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// Instead of relying on Chromium for history control, we compeletely do history
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// control on user land, and only rely on WebContents.loadURL for navigation.
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// This helps us avoid Chromium's various optimizations so we can ensure renderer
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// process is restarted everytime.
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const NavigationController = (function () {
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function NavigationController (webContents) {
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this.webContents = webContents
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this.clearHistory()
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// webContents may have already navigated to a page.
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if (this.webContents._getURL()) {
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this.currentIndex++
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this.history.push(this.webContents._getURL())
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}
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this.webContents.on('navigation-entry-commited', (event, url, inPage, replaceEntry) => {
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if (this.inPageIndex > -1 && !inPage) {
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// Navigated to a new page, clear in-page mark.
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this.inPageIndex = -1
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} else if (this.inPageIndex === -1 && inPage && !replaceEntry) {
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// Started in-page navigations.
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this.inPageIndex = this.currentIndex
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}
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if (this.pendingIndex >= 0) {
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// Go to index.
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this.currentIndex = this.pendingIndex
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this.pendingIndex = -1
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this.history[this.currentIndex] = url
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} else if (replaceEntry) {
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// Non-user initialized navigation.
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this.history[this.currentIndex] = url
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} else {
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// Normal navigation. Clear history.
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this.history = this.history.slice(0, this.currentIndex + 1)
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this.currentIndex++
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this.history.push(url)
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}
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})
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}
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NavigationController.prototype.loadURL = function (url, options) {
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if (options == null) {
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options = {}
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}
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const p = new Promise((resolve, reject) => {
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const resolveAndCleanup = () => {
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removeListeners()
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resolve()
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}
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const rejectAndCleanup = (errorCode, errorDescription, url) => {
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const err = new Error(`${errorDescription} (${errorCode}) loading '${typeof url === 'string' ? url.substr(0, 2048) : url}'`)
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Object.assign(err, { errno: errorCode, code: errorDescription, url })
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removeListeners()
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reject(err)
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}
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const finishListener = () => {
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resolveAndCleanup()
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}
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const failListener = (event, errorCode, errorDescription, validatedURL, isMainFrame, frameProcessId, frameRoutingId) => {
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if (isMainFrame) {
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rejectAndCleanup(errorCode, errorDescription, validatedURL)
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}
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}
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let navigationStarted = false
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const navigationListener = (event, url, isSameDocument, isMainFrame, frameProcessId, frameRoutingId, navigationId) => {
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if (isMainFrame) {
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if (navigationStarted) {
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// the webcontents has started another unrelated navigation in the
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// main frame (probably from the app calling `loadURL` again); reject
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// the promise
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return rejectAndCleanup(-3, 'ERR_ABORTED', url)
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}
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navigationStarted = true
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}
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}
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const stopLoadingListener = () => {
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// By the time we get here, either 'finish' or 'fail' should have fired
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// if the navigation occurred. However, in some situations (e.g. when
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// attempting to load a page with a bad scheme), loading will stop
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// without emitting finish or fail. In this case, we reject the promise
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// with a generic failure.
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// TODO(jeremy): enumerate all the cases in which this can happen. If
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// the only one is with a bad scheme, perhaps ERR_INVALID_ARGUMENT
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// would be more appropriate.
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rejectAndCleanup(-2, 'ERR_FAILED', url)
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}
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const removeListeners = () => {
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this.webContents.removeListener('did-finish-load', finishListener)
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this.webContents.removeListener('did-fail-load', failListener)
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this.webContents.removeListener('did-start-navigation', navigationListener)
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this.webContents.removeListener('did-stop-loading', stopLoadingListener)
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}
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this.webContents.on('did-finish-load', finishListener)
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this.webContents.on('did-fail-load', failListener)
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this.webContents.on('did-start-navigation', navigationListener)
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this.webContents.on('did-stop-loading', stopLoadingListener)
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})
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// Add a no-op rejection handler to silence the unhandled rejection error.
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p.catch(() => {})
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this.pendingIndex = -1
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this.webContents._loadURL(url, options)
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this.webContents.emit('load-url', url, options)
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return p
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}
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NavigationController.prototype.getURL = function () {
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if (this.currentIndex === -1) {
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return ''
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} else {
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return this.history[this.currentIndex]
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}
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}
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NavigationController.prototype.stop = function () {
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this.pendingIndex = -1
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return this.webContents._stop()
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}
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NavigationController.prototype.reload = function () {
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this.pendingIndex = this.currentIndex
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return this.webContents._loadURL(this.getURL(), {})
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}
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NavigationController.prototype.reloadIgnoringCache = function () {
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this.pendingIndex = this.currentIndex
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return this.webContents._loadURL(this.getURL(), {
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extraHeaders: 'pragma: no-cache\n'
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})
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}
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NavigationController.prototype.canGoBack = function () {
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return this.getActiveIndex() > 0
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}
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NavigationController.prototype.canGoForward = function () {
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return this.getActiveIndex() < this.history.length - 1
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}
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NavigationController.prototype.canGoToIndex = function (index) {
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return index >= 0 && index < this.history.length
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}
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NavigationController.prototype.canGoToOffset = function (offset) {
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return this.canGoToIndex(this.currentIndex + offset)
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}
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NavigationController.prototype.clearHistory = function () {
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this.history = []
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this.currentIndex = -1
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this.pendingIndex = -1
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this.inPageIndex = -1
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}
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NavigationController.prototype.goBack = function () {
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if (!this.canGoBack()) {
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return
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}
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this.pendingIndex = this.getActiveIndex() - 1
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if (this.inPageIndex > -1 && this.pendingIndex >= this.inPageIndex) {
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return this.webContents._goBack()
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} else {
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return this.webContents._loadURL(this.history[this.pendingIndex], {})
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}
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}
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NavigationController.prototype.goForward = function () {
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if (!this.canGoForward()) {
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return
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}
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this.pendingIndex = this.getActiveIndex() + 1
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if (this.inPageIndex > -1 && this.pendingIndex >= this.inPageIndex) {
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return this.webContents._goForward()
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} else {
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return this.webContents._loadURL(this.history[this.pendingIndex], {})
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}
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}
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NavigationController.prototype.goToIndex = function (index) {
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if (!this.canGoToIndex(index)) {
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return
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}
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this.pendingIndex = index
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return this.webContents._loadURL(this.history[this.pendingIndex], {})
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}
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NavigationController.prototype.goToOffset = function (offset) {
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if (!this.canGoToOffset(offset)) {
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return
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}
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const pendingIndex = this.currentIndex + offset
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if (this.inPageIndex > -1 && pendingIndex >= this.inPageIndex) {
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this.pendingIndex = pendingIndex
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return this.webContents._goToOffset(offset)
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} else {
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return this.goToIndex(pendingIndex)
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}
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}
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NavigationController.prototype.getActiveIndex = function () {
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if (this.pendingIndex === -1) {
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return this.currentIndex
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} else {
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return this.pendingIndex
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}
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}
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NavigationController.prototype.length = function () {
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return this.history.length
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}
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return NavigationController
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})()
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module.exports = NavigationController
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