292 lines
10 KiB
JavaScript
292 lines
10 KiB
JavaScript
'use strict'
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const { webFrame } = require('electron')
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const v8Util = process.atomBinding('v8_util')
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const ipcRenderer = require('@electron/internal/renderer/ipc-renderer-internal')
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const guestViewInternal = require('@electron/internal/renderer/web-view/guest-view-internal')
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const webViewConstants = require('@electron/internal/renderer/web-view/web-view-constants')
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const errorUtils = require('@electron/internal/common/error-utils')
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const {
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syncMethods,
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asyncCallbackMethods,
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asyncPromiseMethods
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} = require('@electron/internal/common/web-view-methods')
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// ID generator.
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let nextId = 0
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const getNextId = function () {
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return ++nextId
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}
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// Represents the internal state of the WebView node.
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class WebViewImpl {
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constructor (webviewNode) {
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this.webviewNode = webviewNode
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this.elementAttached = false
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this.beforeFirstNavigation = true
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this.hasFocus = false
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// on* Event handlers.
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this.on = {}
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// Create internal iframe element.
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this.internalElement = this.createInternalElement()
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const shadowRoot = this.webviewNode.attachShadow({ mode: 'open' })
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shadowRoot.innerHTML = '<!DOCTYPE html><style type="text/css">:host { display: flex; }</style>'
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this.setupWebViewAttributes()
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this.viewInstanceId = getNextId()
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shadowRoot.appendChild(this.internalElement)
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// Provide access to contentWindow.
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Object.defineProperty(this.webviewNode, 'contentWindow', {
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get: () => {
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return this.internalElement.contentWindow
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},
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enumerable: true
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})
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}
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createInternalElement () {
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const iframeElement = document.createElement('iframe')
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iframeElement.style.flex = '1 1 auto'
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iframeElement.style.width = '100%'
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iframeElement.style.border = '0'
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v8Util.setHiddenValue(iframeElement, 'internal', this)
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return iframeElement
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}
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// Resets some state upon reattaching <webview> element to the DOM.
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reset () {
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// If guestInstanceId is defined then the <webview> has navigated and has
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// already picked up a partition ID. Thus, we need to reset the initialization
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// state. However, it may be the case that beforeFirstNavigation is false BUT
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// guestInstanceId has yet to be initialized. This means that we have not
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// heard back from createGuest yet. We will not reset the flag in this case so
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// that we don't end up allocating a second guest.
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if (this.guestInstanceId) {
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guestViewInternal.destroyGuest(this.guestInstanceId)
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this.guestInstanceId = void 0
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}
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this.beforeFirstNavigation = true
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this.attributes[webViewConstants.ATTRIBUTE_PARTITION].validPartitionId = true
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// Since attachment swaps a local frame for a remote frame, we need our
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// internal iframe element to be local again before we can reattach.
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const newFrame = this.createInternalElement()
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const oldFrame = this.internalElement
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this.internalElement = newFrame
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oldFrame.parentNode.replaceChild(newFrame, oldFrame)
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}
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// Sets the <webview>.request property.
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setRequestPropertyOnWebViewNode (request) {
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Object.defineProperty(this.webviewNode, 'request', {
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value: request,
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enumerable: true
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})
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}
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// This observer monitors mutations to attributes of the <webview> and
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// updates the BrowserPlugin properties accordingly. In turn, updating
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// a BrowserPlugin property will update the corresponding BrowserPlugin
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// attribute, if necessary. See BrowserPlugin::UpdateDOMAttribute for more
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// details.
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handleWebviewAttributeMutation (attributeName, oldValue, newValue) {
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if (!this.attributes[attributeName] || this.attributes[attributeName].ignoreMutation) {
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return
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}
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// Let the changed attribute handle its own mutation
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this.attributes[attributeName].handleMutation(oldValue, newValue)
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}
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onElementResize () {
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const resizeEvent = new Event('resize')
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resizeEvent.newWidth = this.webviewNode.clientWidth
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resizeEvent.newHeight = this.webviewNode.clientHeight
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this.dispatchEvent(resizeEvent)
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}
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createGuest () {
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return guestViewInternal.createGuest(this.buildParams(), (event, guestInstanceId) => {
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this.attachGuestInstance(guestInstanceId)
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})
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}
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createGuestSync () {
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this.beforeFirstNavigation = false
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this.attachGuestInstance(guestViewInternal.createGuestSync(this.buildParams()))
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}
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dispatchEvent (webViewEvent) {
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this.webviewNode.dispatchEvent(webViewEvent)
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}
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// Adds an 'on<event>' property on the webview, which can be used to set/unset
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// an event handler.
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setupEventProperty (eventName) {
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const propertyName = `on${eventName.toLowerCase()}`
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return Object.defineProperty(this.webviewNode, propertyName, {
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get: () => {
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return this.on[propertyName]
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},
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set: (value) => {
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if (this.on[propertyName]) {
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this.webviewNode.removeEventListener(eventName, this.on[propertyName])
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}
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this.on[propertyName] = value
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if (value) {
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return this.webviewNode.addEventListener(eventName, value)
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}
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},
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enumerable: true
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})
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}
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// Updates state upon loadcommit.
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onLoadCommit (webViewEvent) {
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const oldValue = this.webviewNode.getAttribute(webViewConstants.ATTRIBUTE_SRC)
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const newValue = webViewEvent.url
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if (webViewEvent.isMainFrame && (oldValue !== newValue)) {
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// Touching the src attribute triggers a navigation. To avoid
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// triggering a page reload on every guest-initiated navigation,
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// we do not handle this mutation.
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this.attributes[webViewConstants.ATTRIBUTE_SRC].setValueIgnoreMutation(newValue)
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}
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}
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// Emits focus/blur events.
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onFocusChange () {
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const hasFocus = document.activeElement === this.webviewNode
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if (hasFocus !== this.hasFocus) {
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this.hasFocus = hasFocus
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this.dispatchEvent(new Event(hasFocus ? 'focus' : 'blur'))
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}
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}
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onAttach (storagePartitionId) {
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return this.attributes[webViewConstants.ATTRIBUTE_PARTITION].setValue(storagePartitionId)
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}
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buildParams () {
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const params = {
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instanceId: this.viewInstanceId,
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userAgentOverride: this.userAgentOverride
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}
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for (const attributeName in this.attributes) {
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if (this.attributes.hasOwnProperty(attributeName)) {
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params[attributeName] = this.attributes[attributeName].getValue()
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}
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}
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return params
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}
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attachGuestInstance (guestInstanceId) {
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if (!this.elementAttached) {
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// The element could be detached before we got response from browser.
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return
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}
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this.internalInstanceId = getNextId()
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this.guestInstanceId = guestInstanceId
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guestViewInternal.attachGuest(this.internalInstanceId, this.guestInstanceId, this.buildParams(), this.internalElement.contentWindow)
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// ResizeObserver is a browser global not recognized by "standard".
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/* globals ResizeObserver */
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// TODO(zcbenz): Should we deprecate the "resize" event? Wait, it is not
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// even documented.
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this.resizeObserver = new ResizeObserver(this.onElementResize.bind(this)).observe(this.internalElement)
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}
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}
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const setupAttributes = () => {
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require('@electron/internal/renderer/web-view/web-view-attributes')
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}
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const setupMethods = (WebViewElement) => {
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// WebContents associated with this webview.
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WebViewElement.prototype.getWebContents = function () {
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const { getRemote } = require('@electron/internal/renderer/remote')
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const getGuestWebContents = getRemote('getGuestWebContents')
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const internal = v8Util.getHiddenValue(this, 'internal')
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if (!internal.guestInstanceId) {
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internal.createGuestSync()
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}
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return getGuestWebContents(internal.guestInstanceId)
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}
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// Focusing the webview should move page focus to the underlying iframe.
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WebViewElement.prototype.focus = function () {
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this.contentWindow.focus()
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}
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const getGuestInstanceId = function (self) {
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const internal = v8Util.getHiddenValue(self, 'internal')
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if (!internal.guestInstanceId) {
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throw new Error('The WebView must be attached to the DOM and the dom-ready event emitted before this method can be called.')
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}
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return internal.guestInstanceId
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}
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// Forward proto.foo* method calls to WebViewImpl.foo*.
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const createBlockHandler = function (method) {
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return function (...args) {
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const [error, result] = ipcRenderer.sendSync('ELECTRON_GUEST_VIEW_MANAGER_SYNC_CALL', getGuestInstanceId(this), method, args)
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if (error) {
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throw errorUtils.deserialize(error)
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} else {
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return result
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}
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}
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}
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for (const method of syncMethods) {
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WebViewElement.prototype[method] = createBlockHandler(method)
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}
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const createNonBlockHandler = function (method) {
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return function (...args) {
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const callback = (typeof args[args.length - 1] === 'function') ? args.pop() : null
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const requestId = getNextId()
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ipcRenderer.once(`ELECTRON_GUEST_VIEW_MANAGER_ASYNC_CALL_RESPONSE_${requestId}`, function (event, error, result) {
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if (error == null) {
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if (callback) callback(result)
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} else {
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throw errorUtils.deserialize(error)
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}
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})
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ipcRenderer.send('ELECTRON_GUEST_VIEW_MANAGER_ASYNC_CALL', requestId, getGuestInstanceId(this), method, args, callback != null)
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}
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}
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for (const method of asyncCallbackMethods) {
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WebViewElement.prototype[method] = createNonBlockHandler(method)
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}
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const createPromiseHandler = function (method) {
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return function (...args) {
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return new Promise((resolve, reject) => {
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const callback = (typeof args[args.length - 1] === 'function') ? args.pop() : null
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const requestId = getNextId()
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ipcRenderer.once(`ELECTRON_GUEST_VIEW_MANAGER_ASYNC_CALL_RESPONSE_${requestId}`, function (event, error, result) {
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if (error == null) {
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if (callback) {
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callback(result)
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}
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resolve(result)
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} else {
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reject(errorUtils.deserialize(error))
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}
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})
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ipcRenderer.send('ELECTRON_GUEST_VIEW_MANAGER_ASYNC_CALL', requestId, getGuestInstanceId(this), method, args, callback != null)
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})
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}
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}
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for (const method of asyncPromiseMethods) {
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WebViewElement.prototype[method] = createPromiseHandler(method)
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}
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}
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module.exports = { setupAttributes, setupMethods, guestViewInternal, webFrame, WebViewImpl }
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