469 lines
16 KiB
JavaScript
469 lines
16 KiB
JavaScript
'use strict'
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const {ipcRenderer, remote, webFrame} = require('electron')
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const v8Util = process.atomBinding('v8_util')
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const guestViewInternal = require('./guest-view-internal')
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const webViewConstants = require('./web-view-constants')
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const hasProp = {}.hasOwnProperty
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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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v8Util.setHiddenValue(this.webviewNode, 'internal', this)
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this.attached = false
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this.elementAttached = false
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this.beforeFirstNavigation = true
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// on* Event handlers.
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this.on = {}
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this.browserPluginNode = this.createBrowserPluginNode()
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const shadowRoot = this.webviewNode.createShadowRoot()
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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.setupFocusPropagation()
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this.viewInstanceId = getNextId()
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shadowRoot.appendChild(this.browserPluginNode)
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// Subscribe to host's zoom level changes.
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this.onZoomLevelChanged = (zoomLevel) => {
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this.webviewNode.setZoomLevel(zoomLevel)
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}
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webFrame.on('zoom-level-changed', this.onZoomLevelChanged)
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this.onVisibilityChanged = (event, visibilityState) => {
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this.webviewNode.send('ELECTRON_RENDERER_WINDOW_VISIBILITY_CHANGE', visibilityState)
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}
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ipcRenderer.on('ELECTRON_RENDERER_WINDOW_VISIBILITY_CHANGE', this.onVisibilityChanged)
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}
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createBrowserPluginNode () {
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// We create BrowserPlugin as a custom element in order to observe changes
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// to attributes synchronously.
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const browserPluginNode = new WebViewImpl.BrowserPlugin()
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v8Util.setHiddenValue(browserPluginNode, 'internal', this)
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return browserPluginNode
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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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// Unlisten the zoom-level-changed event.
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webFrame.removeListener('zoom-level-changed', this.onZoomLevelChanged)
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ipcRenderer.removeListener('ELECTRON_RENDERER_WINDOW_VISIBILITY_CHANGE', this.onVisibilityChanged)
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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.webContents = null
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this.beforeFirstNavigation = true
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this.attributes[webViewConstants.ATTRIBUTE_PARTITION].validPartitionId = true
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// Set guestinstance last since this can trigger the attachedCallback to fire
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// when moving the webview using element.replaceChild
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this.attributes[webViewConstants.ATTRIBUTE_GUESTINSTANCE].setValueIgnoreMutation(undefined)
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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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setupFocusPropagation () {
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if (!this.webviewNode.hasAttribute('tabIndex')) {
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// <webview> needs a tabIndex in order to be focusable.
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// TODO(fsamuel): It would be nice to avoid exposing a tabIndex attribute
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// to allow <webview> to be focusable.
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// See http://crbug.com/231664.
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this.webviewNode.setAttribute('tabIndex', -1)
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}
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// Focus the BrowserPlugin when the <webview> takes focus.
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this.webviewNode.addEventListener('focus', () => {
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this.browserPluginNode.focus()
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})
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// Blur the BrowserPlugin when the <webview> loses focus.
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this.webviewNode.addEventListener('blur', () => {
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this.browserPluginNode.blur()
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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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handleBrowserPluginAttributeMutation (attributeName, oldValue, newValue) {
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if (attributeName === webViewConstants.ATTRIBUTE_INTERNALINSTANCEID && !oldValue && !!newValue) {
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this.browserPluginNode.removeAttribute(webViewConstants.ATTRIBUTE_INTERNALINSTANCEID)
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this.internalInstanceId = parseInt(newValue)
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// Track when the element resizes using the element resize callback.
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webFrame.registerElementResizeCallback(this.internalInstanceId, this.onElementResize.bind(this))
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if (this.guestInstanceId) {
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guestViewInternal.attachGuest(this.internalInstanceId, this.guestInstanceId, this.buildParams())
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}
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}
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}
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onSizeChanged (webViewEvent) {
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const {newHeight, newWidth} = webViewEvent
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const node = this.webviewNode
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const width = node.offsetWidth
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// Check the current bounds to make sure we do not resize <webview>
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// outside of current constraints.
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const maxWidth = this.attributes[webViewConstants.ATTRIBUTE_MAXWIDTH].getValue() | width
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const maxHeight = this.attributes[webViewConstants.ATTRIBUTE_MAXHEIGHT].getValue() | width
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let minWidth = this.attributes[webViewConstants.ATTRIBUTE_MINWIDTH].getValue() | width
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let minHeight = this.attributes[webViewConstants.ATTRIBUTE_MINHEIGHT].getValue() | width
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minWidth = Math.min(minWidth, maxWidth)
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minHeight = Math.min(minHeight, maxHeight)
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if (!this.attributes[webViewConstants.ATTRIBUTE_AUTOSIZE].getValue() || (newWidth >= minWidth && newWidth <= maxWidth && newHeight >= minHeight && newHeight <= maxHeight)) {
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node.style.width = `${newWidth}px`
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node.style.height = `${newHeight}px`
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// Only fire the DOM event if the size of the <webview> has actually
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// changed.
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this.dispatchEvent(webViewEvent)
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}
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}
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onElementResize (newSize) {
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// Dispatch the 'resize' event.
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const resizeEvent = new Event('resize', {
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bubbles: true
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})
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// Using client size values, because when a webview is transformed `newSize`
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// is incorrect
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newSize.width = this.webviewNode.clientWidth
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newSize.height = this.webviewNode.clientHeight
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resizeEvent.newWidth = newSize.width
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resizeEvent.newHeight = newSize.height
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this.dispatchEvent(resizeEvent)
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if (this.guestInstanceId &&
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!this.attributes[webViewConstants.ATTRIBUTE_DISABLEGUESTRESIZE].getValue()) {
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guestViewInternal.setSize(this.guestInstanceId, {
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normal: newSize
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})
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}
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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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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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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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zoomFactor: webFrame.getZoomFactor()
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}
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for (const attributeName in this.attributes) {
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if (hasProp.call(this.attributes, attributeName)) {
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params[attributeName] = this.attributes[attributeName].getValue()
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}
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}
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// When the WebView is not participating in layout (display:none)
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// then getBoundingClientRect() would report a width and height of 0.
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// However, in the case where the WebView has a fixed size we can
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// use that value to initially size the guest so as to avoid a relayout of
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// the on display:block.
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const css = window.getComputedStyle(this.webviewNode, null)
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const elementRect = this.webviewNode.getBoundingClientRect()
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params.elementWidth = parseInt(elementRect.width) || parseInt(css.getPropertyValue('width'))
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params.elementHeight = parseInt(elementRect.height) || parseInt(css.getPropertyValue('height'))
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return params
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}
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attachGuestInstance (guestInstanceId) {
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this.guestInstanceId = guestInstanceId
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this.attributes[webViewConstants.ATTRIBUTE_GUESTINSTANCE].setValueIgnoreMutation(guestInstanceId)
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this.webContents = remote.getGuestWebContents(this.guestInstanceId)
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if (!this.internalInstanceId) {
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return true
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}
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return guestViewInternal.attachGuest(this.internalInstanceId, this.guestInstanceId, this.buildParams())
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}
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}
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// Registers browser plugin <object> custom element.
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const registerBrowserPluginElement = function () {
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const proto = Object.create(HTMLObjectElement.prototype)
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proto.createdCallback = function () {
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this.setAttribute('type', 'application/browser-plugin')
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this.setAttribute('id', `browser-plugin-${getNextId()}`)
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// The <object> node fills in the <webview> container.
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this.style.flex = '1 1 auto'
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}
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proto.attributeChangedCallback = function (name, oldValue, newValue) {
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var internal
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internal = v8Util.getHiddenValue(this, 'internal')
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if (internal) {
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internal.handleBrowserPluginAttributeMutation(name, oldValue, newValue)
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}
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}
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proto.attachedCallback = function () {
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// Load the plugin immediately.
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return this.nonExistentAttribute
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}
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WebViewImpl.BrowserPlugin = webFrame.registerEmbedderCustomElement('browserplugin', {
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'extends': 'object',
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prototype: proto
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})
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delete proto.createdCallback
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delete proto.attachedCallback
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delete proto.detachedCallback
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delete proto.attributeChangedCallback
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}
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// Registers <webview> custom element.
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var registerWebViewElement = function () {
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const proto = Object.create(HTMLObjectElement.prototype)
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proto.createdCallback = function () {
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return new WebViewImpl(this)
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}
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proto.attributeChangedCallback = function (name, oldValue, newValue) {
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var internal
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internal = v8Util.getHiddenValue(this, 'internal')
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if (internal) {
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internal.handleWebviewAttributeMutation(name, oldValue, newValue)
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}
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}
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proto.detachedCallback = function () {
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var internal
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internal = v8Util.getHiddenValue(this, 'internal')
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if (!internal) {
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return
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}
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guestViewInternal.deregisterEvents(internal.viewInstanceId)
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internal.elementAttached = false
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this.internalInstanceId = 0
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internal.reset()
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}
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proto.attachedCallback = function () {
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var internal, instance
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internal = v8Util.getHiddenValue(this, 'internal')
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if (!internal) {
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return
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}
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if (!internal.elementAttached) {
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guestViewInternal.registerEvents(internal, internal.viewInstanceId)
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internal.elementAttached = true
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instance = internal.attributes[webViewConstants.ATTRIBUTE_GUESTINSTANCE].getValue()
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if (instance) {
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internal.attachGuestInstance(instance)
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} else {
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internal.attributes[webViewConstants.ATTRIBUTE_SRC].parse()
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}
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}
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}
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// Public-facing API methods.
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const methods = [
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'getURL',
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'loadURL',
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'getTitle',
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'isLoading',
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'isLoadingMainFrame',
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'isWaitingForResponse',
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'stop',
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'reload',
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'reloadIgnoringCache',
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'canGoBack',
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'canGoForward',
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'canGoToOffset',
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'clearHistory',
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'goBack',
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'goForward',
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'goToIndex',
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'goToOffset',
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'isCrashed',
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'setUserAgent',
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'getUserAgent',
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'openDevTools',
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'closeDevTools',
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'isDevToolsOpened',
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'isDevToolsFocused',
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'inspectElement',
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'setAudioMuted',
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'isAudioMuted',
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'undo',
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'redo',
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'cut',
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'copy',
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'paste',
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'pasteAndMatchStyle',
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'delete',
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'selectAll',
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'unselect',
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'replace',
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'replaceMisspelling',
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'findInPage',
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'stopFindInPage',
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'getId',
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'downloadURL',
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'inspectServiceWorker',
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'print',
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'printToPDF',
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'showDefinitionForSelection',
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'capturePage'
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]
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const nonblockMethods = [
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'insertCSS',
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'insertText',
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'send',
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'sendInputEvent',
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'setLayoutZoomLevelLimits',
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'setVisualZoomLevelLimits',
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'setZoomFactor',
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'setZoomLevel',
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// TODO(kevinsawicki): Remove in 2.0, deprecate before then with warnings
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'setZoomLevelLimits'
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]
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// Forward proto.foo* method calls to WebViewImpl.foo*.
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const createBlockHandler = function (m) {
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return function (...args) {
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const internal = v8Util.getHiddenValue(this, 'internal')
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if (internal.webContents) {
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return internal.webContents[m](...args)
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} else {
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throw new Error(`Cannot call ${m} because the webContents is unavailable. 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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}
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}
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for (const method of methods) {
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proto[method] = createBlockHandler(method)
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}
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const createNonBlockHandler = function (m) {
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return function (...args) {
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const internal = v8Util.getHiddenValue(this, 'internal')
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ipcRenderer.send('ELECTRON_BROWSER_ASYNC_CALL_TO_GUEST_VIEW', null, internal.guestInstanceId, m, ...args)
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}
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}
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for (const method of nonblockMethods) {
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proto[method] = createNonBlockHandler(method)
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}
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proto.executeJavaScript = function (code, hasUserGesture, callback) {
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const internal = v8Util.getHiddenValue(this, 'internal')
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if (typeof hasUserGesture === 'function') {
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callback = hasUserGesture
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hasUserGesture = false
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}
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const requestId = getNextId()
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ipcRenderer.send('ELECTRON_BROWSER_ASYNC_CALL_TO_GUEST_VIEW', requestId, internal.guestInstanceId, 'executeJavaScript', code, hasUserGesture)
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ipcRenderer.once(`ELECTRON_RENDERER_ASYNC_CALL_TO_GUEST_VIEW_RESPONSE_${requestId}`, function (event, result) {
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if (callback) callback(result)
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})
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}
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// WebContents associated with this webview.
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proto.getWebContents = function () {
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return v8Util.getHiddenValue(this, 'internal').webContents
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}
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window.WebView = webFrame.registerEmbedderCustomElement('webview', {
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prototype: proto
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})
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// Delete the callbacks so developers cannot call them and produce unexpected
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// behavior.
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delete proto.createdCallback
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delete proto.attachedCallback
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delete proto.detachedCallback
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delete proto.attributeChangedCallback
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}
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const useCapture = true
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const listener = function (event) {
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if (document.readyState === 'loading') {
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return
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}
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registerBrowserPluginElement()
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registerWebViewElement()
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window.removeEventListener(event.type, listener, useCapture)
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}
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window.addEventListener('readystatechange', listener, true)
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module.exports = WebViewImpl
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