394 lines
12 KiB
JavaScript
394 lines
12 KiB
JavaScript
'use strict'
|
|
|
|
const {ipcRenderer, remote, webFrame} = require('electron')
|
|
|
|
const v8Util = process.atomBinding('v8_util')
|
|
const guestViewInternal = require('./guest-view-internal')
|
|
const webViewConstants = require('./web-view-constants')
|
|
|
|
// An unique ID that can represent current context.
|
|
const contextId = v8Util.getHiddenValue(global, 'contextId')
|
|
|
|
// ID generator.
|
|
let nextId = 0
|
|
|
|
const getNextId = function () {
|
|
return ++nextId
|
|
}
|
|
|
|
// A list of removed attributes from 3.0.
|
|
const removedAttributes = [
|
|
'autoresize',
|
|
'disableguestresize',
|
|
'guestinstance'
|
|
]
|
|
|
|
// Represents the internal state of the WebView node.
|
|
class WebViewImpl {
|
|
constructor (webviewNode) {
|
|
this.webviewNode = webviewNode
|
|
v8Util.setHiddenValue(this.webviewNode, 'internal', this)
|
|
this.elementAttached = false
|
|
this.beforeFirstNavigation = true
|
|
this.hasFocus = false
|
|
|
|
// Check for removed attributes.
|
|
for (const attributeName of removedAttributes) {
|
|
if (this.webviewNode.hasAttribute(attributeName)) {
|
|
this.reportRemovedAttribute(attributeName)
|
|
}
|
|
}
|
|
|
|
// on* Event handlers.
|
|
this.on = {}
|
|
|
|
// Create internal iframe element.
|
|
this.internalElement = this.createInternalElement()
|
|
const shadowRoot = this.webviewNode.attachShadow({mode: 'open'})
|
|
shadowRoot.innerHTML = '<!DOCTYPE html><style type="text/css">:host { display: flex; }</style>'
|
|
this.setupWebViewAttributes()
|
|
this.viewInstanceId = getNextId()
|
|
shadowRoot.appendChild(this.internalElement)
|
|
|
|
// Provide access to contentWindow.
|
|
Object.defineProperty(this.webviewNode, 'contentWindow', {
|
|
get: () => {
|
|
return this.internalElement.contentWindow
|
|
},
|
|
enumerable: true
|
|
})
|
|
}
|
|
|
|
createInternalElement () {
|
|
const iframeElement = document.createElement('iframe')
|
|
iframeElement.style.width = '100%'
|
|
iframeElement.style.height = '100%'
|
|
iframeElement.style.border = '0'
|
|
v8Util.setHiddenValue(iframeElement, 'internal', this)
|
|
return iframeElement
|
|
}
|
|
|
|
// Resets some state upon reattaching <webview> element to the DOM.
|
|
reset () {
|
|
// If guestInstanceId is defined then the <webview> has navigated and has
|
|
// already picked up a partition ID. Thus, we need to reset the initialization
|
|
// state. However, it may be the case that beforeFirstNavigation is false BUT
|
|
// guestInstanceId has yet to be initialized. This means that we have not
|
|
// heard back from createGuest yet. We will not reset the flag in this case so
|
|
// that we don't end up allocating a second guest.
|
|
if (this.guestInstanceId) {
|
|
this.guestInstanceId = void 0
|
|
}
|
|
|
|
this.webContents = null
|
|
this.beforeFirstNavigation = true
|
|
this.attributes[webViewConstants.ATTRIBUTE_PARTITION].validPartitionId = true
|
|
|
|
// Since attachment swaps a local frame for a remote frame, we need our
|
|
// internal iframe element to be local again before we can reattach.
|
|
const newFrame = this.createInternalElement()
|
|
const oldFrame = this.internalElement
|
|
this.internalElement = newFrame
|
|
oldFrame.parentNode.replaceChild(newFrame, oldFrame)
|
|
}
|
|
|
|
// Sets the <webview>.request property.
|
|
setRequestPropertyOnWebViewNode (request) {
|
|
Object.defineProperty(this.webviewNode, 'request', {
|
|
value: request,
|
|
enumerable: true
|
|
})
|
|
}
|
|
|
|
// This observer monitors mutations to attributes of the <webview> and
|
|
// updates the BrowserPlugin properties accordingly. In turn, updating
|
|
// a BrowserPlugin property will update the corresponding BrowserPlugin
|
|
// attribute, if necessary. See BrowserPlugin::UpdateDOMAttribute for more
|
|
// details.
|
|
handleWebviewAttributeMutation (attributeName, oldValue, newValue) {
|
|
if (removedAttributes.includes(attributeName)) {
|
|
this.reportRemovedAttribute(attributeName)
|
|
return
|
|
}
|
|
|
|
if (!this.attributes[attributeName] || this.attributes[attributeName].ignoreMutation) {
|
|
return
|
|
}
|
|
|
|
// Let the changed attribute handle its own mutation
|
|
this.attributes[attributeName].handleMutation(oldValue, newValue)
|
|
}
|
|
|
|
onElementResize () {
|
|
const resizeEvent = new Event('resize')
|
|
resizeEvent.newWidth = this.webviewNode.clientWidth
|
|
resizeEvent.newHeight = this.webviewNode.clientHeight
|
|
this.dispatchEvent(resizeEvent)
|
|
}
|
|
|
|
createGuest () {
|
|
return guestViewInternal.createGuest(this.buildParams(), (event, guestInstanceId) => {
|
|
this.attachGuestInstance(guestInstanceId)
|
|
})
|
|
}
|
|
|
|
createGuestSync () {
|
|
this.beforeFirstNavigation = false
|
|
this.attachGuestInstance(guestViewInternal.createGuestSync(this.buildParams()))
|
|
}
|
|
|
|
dispatchEvent (webViewEvent) {
|
|
this.webviewNode.dispatchEvent(webViewEvent)
|
|
}
|
|
|
|
// Adds an 'on<event>' property on the webview, which can be used to set/unset
|
|
// an event handler.
|
|
setupEventProperty (eventName) {
|
|
const propertyName = `on${eventName.toLowerCase()}`
|
|
return Object.defineProperty(this.webviewNode, propertyName, {
|
|
get: () => {
|
|
return this.on[propertyName]
|
|
},
|
|
set: (value) => {
|
|
if (this.on[propertyName]) {
|
|
this.webviewNode.removeEventListener(eventName, this.on[propertyName])
|
|
}
|
|
this.on[propertyName] = value
|
|
if (value) {
|
|
return this.webviewNode.addEventListener(eventName, value)
|
|
}
|
|
},
|
|
enumerable: true
|
|
})
|
|
}
|
|
|
|
// Updates state upon loadcommit.
|
|
onLoadCommit (webViewEvent) {
|
|
const oldValue = this.webviewNode.getAttribute(webViewConstants.ATTRIBUTE_SRC)
|
|
const newValue = webViewEvent.url
|
|
if (webViewEvent.isMainFrame && (oldValue !== newValue)) {
|
|
// Touching the src attribute triggers a navigation. To avoid
|
|
// triggering a page reload on every guest-initiated navigation,
|
|
// we do not handle this mutation.
|
|
this.attributes[webViewConstants.ATTRIBUTE_SRC].setValueIgnoreMutation(newValue)
|
|
}
|
|
}
|
|
|
|
// Emits focus/blur events.
|
|
onFocusChange () {
|
|
const hasFocus = document.activeElement === this.webviewNode
|
|
if (hasFocus !== this.hasFocus) {
|
|
this.hasFocus = hasFocus
|
|
this.dispatchEvent(new Event(hasFocus ? 'focus' : 'blur'))
|
|
}
|
|
}
|
|
|
|
onAttach (storagePartitionId) {
|
|
return this.attributes[webViewConstants.ATTRIBUTE_PARTITION].setValue(storagePartitionId)
|
|
}
|
|
|
|
buildParams () {
|
|
const params = {
|
|
instanceId: this.viewInstanceId,
|
|
userAgentOverride: this.userAgentOverride
|
|
}
|
|
for (const attributeName in this.attributes) {
|
|
if (this.attributes.hasOwnProperty(attributeName)) {
|
|
params[attributeName] = this.attributes[attributeName].getValue()
|
|
}
|
|
}
|
|
return params
|
|
}
|
|
|
|
attachGuestInstance (guestInstanceId) {
|
|
if (!this.elementAttached) {
|
|
// The element could be detached before we got response from browser.
|
|
return
|
|
}
|
|
this.internalInstanceId = getNextId()
|
|
this.guestInstanceId = guestInstanceId
|
|
this.webContents = remote.getGuestWebContents(this.guestInstanceId)
|
|
guestViewInternal.attachGuest(this.internalInstanceId, this.guestInstanceId, this.buildParams(), this.internalElement.contentWindow)
|
|
// ResizeObserver is a browser global not recognized by "standard".
|
|
/* globals ResizeObserver */
|
|
// TODO(zcbenz): Should we deprecate the "resize" event? Wait, it is not
|
|
// even documented.
|
|
this.resizeObserver = new ResizeObserver(this.onElementResize.bind(this)).observe(this.internalElement)
|
|
}
|
|
|
|
// TODO(zcbenz): Remove the warning in 4.0.
|
|
reportRemovedAttribute (attributeName) {
|
|
console.error(`The "${attributeName}" attribute has been removed from the <webview> tag,`,
|
|
'see https://github.com/electron/electron/issues/14120 for more.')
|
|
}
|
|
}
|
|
|
|
// Registers <webview> custom element.
|
|
const registerWebViewElement = function () {
|
|
const proto = Object.create(HTMLObjectElement.prototype)
|
|
proto.createdCallback = function () {
|
|
return new WebViewImpl(this)
|
|
}
|
|
proto.attributeChangedCallback = function (name, oldValue, newValue) {
|
|
const internal = v8Util.getHiddenValue(this, 'internal')
|
|
if (internal) {
|
|
internal.handleWebviewAttributeMutation(name, oldValue, newValue)
|
|
}
|
|
}
|
|
proto.detachedCallback = function () {
|
|
const internal = v8Util.getHiddenValue(this, 'internal')
|
|
if (!internal) {
|
|
return
|
|
}
|
|
guestViewInternal.deregisterEvents(internal.viewInstanceId)
|
|
internal.elementAttached = false
|
|
this.internalInstanceId = 0
|
|
internal.reset()
|
|
}
|
|
proto.attachedCallback = function () {
|
|
const internal = v8Util.getHiddenValue(this, 'internal')
|
|
if (!internal) {
|
|
return
|
|
}
|
|
if (!internal.elementAttached) {
|
|
guestViewInternal.registerEvents(internal, internal.viewInstanceId)
|
|
internal.elementAttached = true
|
|
internal.attributes[webViewConstants.ATTRIBUTE_SRC].parse()
|
|
}
|
|
}
|
|
|
|
// Public-facing API methods.
|
|
const methods = [
|
|
'getURL',
|
|
'loadURL',
|
|
'getTitle',
|
|
'isLoading',
|
|
'isLoadingMainFrame',
|
|
'isWaitingForResponse',
|
|
'stop',
|
|
'reload',
|
|
'reloadIgnoringCache',
|
|
'canGoBack',
|
|
'canGoForward',
|
|
'canGoToOffset',
|
|
'clearHistory',
|
|
'goBack',
|
|
'goForward',
|
|
'goToIndex',
|
|
'goToOffset',
|
|
'isCrashed',
|
|
'setUserAgent',
|
|
'getUserAgent',
|
|
'openDevTools',
|
|
'closeDevTools',
|
|
'isDevToolsOpened',
|
|
'isDevToolsFocused',
|
|
'inspectElement',
|
|
'setAudioMuted',
|
|
'isAudioMuted',
|
|
'isCurrentlyAudible',
|
|
'undo',
|
|
'redo',
|
|
'cut',
|
|
'copy',
|
|
'paste',
|
|
'pasteAndMatchStyle',
|
|
'delete',
|
|
'selectAll',
|
|
'unselect',
|
|
'replace',
|
|
'replaceMisspelling',
|
|
'findInPage',
|
|
'stopFindInPage',
|
|
'downloadURL',
|
|
'inspectServiceWorker',
|
|
'print',
|
|
'printToPDF',
|
|
'showDefinitionForSelection',
|
|
'capturePage',
|
|
'setZoomFactor',
|
|
'setZoomLevel',
|
|
'getZoomLevel',
|
|
'getZoomFactor'
|
|
]
|
|
const nonblockMethods = [
|
|
'insertCSS',
|
|
'insertText',
|
|
'send',
|
|
'sendInputEvent',
|
|
'setLayoutZoomLevelLimits',
|
|
'setVisualZoomLevelLimits'
|
|
]
|
|
|
|
// Forward proto.foo* method calls to WebViewImpl.foo*.
|
|
const createBlockHandler = function (m) {
|
|
return function (...args) {
|
|
const internal = v8Util.getHiddenValue(this, 'internal')
|
|
if (internal.webContents) {
|
|
return internal.webContents[m](...args)
|
|
} else {
|
|
throw new Error(`Cannot call ${m} because the webContents is unavailable. The WebView must be attached to the DOM and the dom-ready event emitted before this method can be called.`)
|
|
}
|
|
}
|
|
}
|
|
for (const method of methods) {
|
|
proto[method] = createBlockHandler(method)
|
|
}
|
|
|
|
const createNonBlockHandler = function (m) {
|
|
return function (...args) {
|
|
const internal = v8Util.getHiddenValue(this, 'internal')
|
|
ipcRenderer.send('ELECTRON_BROWSER_ASYNC_CALL_TO_GUEST_VIEW', contextId, null, internal.guestInstanceId, m, ...args)
|
|
}
|
|
}
|
|
for (const method of nonblockMethods) {
|
|
proto[method] = createNonBlockHandler(method)
|
|
}
|
|
|
|
proto.executeJavaScript = function (code, hasUserGesture, callback) {
|
|
const internal = v8Util.getHiddenValue(this, 'internal')
|
|
if (typeof hasUserGesture === 'function') {
|
|
callback = hasUserGesture
|
|
hasUserGesture = false
|
|
}
|
|
const requestId = getNextId()
|
|
ipcRenderer.send('ELECTRON_BROWSER_ASYNC_CALL_TO_GUEST_VIEW', contextId, requestId, internal.guestInstanceId, 'executeJavaScript', code, hasUserGesture)
|
|
ipcRenderer.once(`ELECTRON_RENDERER_ASYNC_CALL_TO_GUEST_VIEW_RESPONSE_${requestId}`, function (event, result) {
|
|
if (callback) callback(result)
|
|
})
|
|
}
|
|
|
|
// WebContents associated with this webview.
|
|
proto.getWebContents = function () {
|
|
const internal = v8Util.getHiddenValue(this, 'internal')
|
|
if (!internal.webContents) {
|
|
internal.createGuestSync()
|
|
}
|
|
return internal.webContents
|
|
}
|
|
|
|
window.WebView = webFrame.registerEmbedderCustomElement('webview', {
|
|
prototype: proto
|
|
})
|
|
|
|
// Delete the callbacks so developers cannot call them and produce unexpected
|
|
// behavior.
|
|
delete proto.createdCallback
|
|
delete proto.attachedCallback
|
|
delete proto.detachedCallback
|
|
delete proto.attributeChangedCallback
|
|
}
|
|
|
|
const useCapture = true
|
|
|
|
const listener = function (event) {
|
|
if (document.readyState === 'loading') {
|
|
return
|
|
}
|
|
registerWebViewElement()
|
|
window.removeEventListener(event.type, listener, useCapture)
|
|
}
|
|
|
|
window.addEventListener('readystatechange', listener, true)
|
|
|
|
module.exports = WebViewImpl
|