459 lines
16 KiB
JavaScript
459 lines
16 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')
|
|
|
|
const hasProp = {}.hasOwnProperty
|
|
|
|
// ID generator.
|
|
let nextId = 0
|
|
|
|
const getNextId = function () {
|
|
return ++nextId
|
|
}
|
|
|
|
// Represents the internal state of the WebView node.
|
|
class WebViewImpl {
|
|
constructor (webviewNode) {
|
|
this.webviewNode = webviewNode
|
|
v8Util.setHiddenValue(this.webviewNode, 'internal', this)
|
|
this.attached = false
|
|
this.elementAttached = false
|
|
this.beforeFirstNavigation = true
|
|
|
|
// on* Event handlers.
|
|
this.on = {}
|
|
this.browserPluginNode = this.createBrowserPluginNode()
|
|
const shadowRoot = this.webviewNode.createShadowRoot()
|
|
shadowRoot.innerHTML = '<!DOCTYPE html><style type="text/css">:host { display: flex; }</style>'
|
|
this.setupWebViewAttributes()
|
|
this.setupFocusPropagation()
|
|
this.viewInstanceId = getNextId()
|
|
shadowRoot.appendChild(this.browserPluginNode)
|
|
|
|
// Forward window visibility changes to guest contents
|
|
this.onVisibilityChanged = (event, visibilityState) => {
|
|
this.webviewNode.send('ELECTRON_RENDERER_WINDOW_VISIBILITY_CHANGE', visibilityState)
|
|
}
|
|
}
|
|
|
|
createBrowserPluginNode () {
|
|
// We create BrowserPlugin as a custom element in order to observe changes
|
|
// to attributes synchronously.
|
|
const browserPluginNode = new WebViewImpl.BrowserPlugin()
|
|
v8Util.setHiddenValue(browserPluginNode, 'internal', this)
|
|
return browserPluginNode
|
|
}
|
|
|
|
// Resets some state upon reattaching <webview> element to the DOM.
|
|
reset () {
|
|
ipcRenderer.removeListener('ELECTRON_RENDERER_WINDOW_VISIBILITY_CHANGE', this.onVisibilityChanged)
|
|
|
|
// 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) {
|
|
guestViewInternal.destroyGuest(this.guestInstanceId)
|
|
this.guestInstanceId = void 0
|
|
}
|
|
|
|
this.webContents = null
|
|
this.beforeFirstNavigation = true
|
|
this.attributes[webViewConstants.ATTRIBUTE_PARTITION].validPartitionId = true
|
|
|
|
// Set guestinstance last since this can trigger the attachedCallback to fire
|
|
// when moving the webview using element.replaceChild
|
|
this.attributes[webViewConstants.ATTRIBUTE_GUESTINSTANCE].setValueIgnoreMutation(undefined)
|
|
}
|
|
|
|
// Sets the <webview>.request property.
|
|
setRequestPropertyOnWebViewNode (request) {
|
|
Object.defineProperty(this.webviewNode, 'request', {
|
|
value: request,
|
|
enumerable: true
|
|
})
|
|
}
|
|
|
|
setupFocusPropagation () {
|
|
if (!this.webviewNode.hasAttribute('tabIndex')) {
|
|
// <webview> needs a tabIndex in order to be focusable.
|
|
// TODO(fsamuel): It would be nice to avoid exposing a tabIndex attribute
|
|
// to allow <webview> to be focusable.
|
|
// See http://crbug.com/231664.
|
|
this.webviewNode.setAttribute('tabIndex', -1)
|
|
}
|
|
|
|
// Focus the BrowserPlugin when the <webview> takes focus.
|
|
this.webviewNode.addEventListener('focus', () => {
|
|
this.browserPluginNode.focus()
|
|
})
|
|
|
|
// Blur the BrowserPlugin when the <webview> loses focus.
|
|
this.webviewNode.addEventListener('blur', () => {
|
|
this.browserPluginNode.blur()
|
|
})
|
|
}
|
|
|
|
// 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 (!this.attributes[attributeName] || this.attributes[attributeName].ignoreMutation) {
|
|
return
|
|
}
|
|
|
|
// Let the changed attribute handle its own mutation
|
|
this.attributes[attributeName].handleMutation(oldValue, newValue)
|
|
}
|
|
|
|
handleBrowserPluginAttributeMutation (attributeName, oldValue, newValue) {
|
|
if (attributeName === webViewConstants.ATTRIBUTE_INTERNALINSTANCEID && !oldValue && !!newValue) {
|
|
this.browserPluginNode.removeAttribute(webViewConstants.ATTRIBUTE_INTERNALINSTANCEID)
|
|
this.internalInstanceId = parseInt(newValue)
|
|
|
|
// Track when the element resizes using the element resize callback.
|
|
webFrame.registerElementResizeCallback(this.internalInstanceId, this.onElementResize.bind(this))
|
|
if (this.guestInstanceId) {
|
|
guestViewInternal.attachGuest(this.internalInstanceId, this.guestInstanceId, this.buildParams())
|
|
}
|
|
}
|
|
}
|
|
|
|
onSizeChanged (webViewEvent) {
|
|
const {newHeight, newWidth} = webViewEvent
|
|
const node = this.webviewNode
|
|
const width = node.offsetWidth
|
|
|
|
// Check the current bounds to make sure we do not resize <webview>
|
|
// outside of current constraints.
|
|
const maxWidth = this.attributes[webViewConstants.ATTRIBUTE_MAXWIDTH].getValue() | width
|
|
const maxHeight = this.attributes[webViewConstants.ATTRIBUTE_MAXHEIGHT].getValue() | width
|
|
let minWidth = this.attributes[webViewConstants.ATTRIBUTE_MINWIDTH].getValue() | width
|
|
let minHeight = this.attributes[webViewConstants.ATTRIBUTE_MINHEIGHT].getValue() | width
|
|
minWidth = Math.min(minWidth, maxWidth)
|
|
minHeight = Math.min(minHeight, maxHeight)
|
|
if (!this.attributes[webViewConstants.ATTRIBUTE_AUTOSIZE].getValue() || (newWidth >= minWidth && newWidth <= maxWidth && newHeight >= minHeight && newHeight <= maxHeight)) {
|
|
node.style.width = `${newWidth}px`
|
|
node.style.height = `${newHeight}px`
|
|
|
|
// Only fire the DOM event if the size of the <webview> has actually
|
|
// changed.
|
|
this.dispatchEvent(webViewEvent)
|
|
}
|
|
}
|
|
|
|
onElementResize (newSize) {
|
|
// Dispatch the 'resize' event.
|
|
const resizeEvent = new Event('resize', {
|
|
bubbles: true
|
|
})
|
|
|
|
// Using client size values, because when a webview is transformed `newSize`
|
|
// is incorrect
|
|
newSize.width = this.webviewNode.clientWidth
|
|
newSize.height = this.webviewNode.clientHeight
|
|
|
|
resizeEvent.newWidth = newSize.width
|
|
resizeEvent.newHeight = newSize.height
|
|
this.dispatchEvent(resizeEvent)
|
|
if (this.guestInstanceId &&
|
|
!this.attributes[webViewConstants.ATTRIBUTE_DISABLEGUESTRESIZE].getValue()) {
|
|
guestViewInternal.setSize(this.guestInstanceId, {
|
|
normal: newSize
|
|
})
|
|
}
|
|
}
|
|
|
|
createGuest () {
|
|
return guestViewInternal.createGuest(this.buildParams(), (event, guestInstanceId) => {
|
|
this.attachGuestInstance(guestInstanceId)
|
|
})
|
|
}
|
|
|
|
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)
|
|
}
|
|
}
|
|
|
|
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 (hasProp.call(this.attributes, attributeName)) {
|
|
params[attributeName] = this.attributes[attributeName].getValue()
|
|
}
|
|
}
|
|
|
|
// When the WebView is not participating in layout (display:none)
|
|
// then getBoundingClientRect() would report a width and height of 0.
|
|
// However, in the case where the WebView has a fixed size we can
|
|
// use that value to initially size the guest so as to avoid a relayout of
|
|
// the on display:block.
|
|
const css = window.getComputedStyle(this.webviewNode, null)
|
|
const elementRect = this.webviewNode.getBoundingClientRect()
|
|
params.elementWidth = parseInt(elementRect.width) || parseInt(css.getPropertyValue('width'))
|
|
params.elementHeight = parseInt(elementRect.height) || parseInt(css.getPropertyValue('height'))
|
|
return params
|
|
}
|
|
|
|
attachGuestInstance (guestInstanceId) {
|
|
this.guestInstanceId = guestInstanceId
|
|
this.attributes[webViewConstants.ATTRIBUTE_GUESTINSTANCE].setValueIgnoreMutation(guestInstanceId)
|
|
this.webContents = remote.getGuestWebContents(this.guestInstanceId)
|
|
if (!this.internalInstanceId) {
|
|
return true
|
|
}
|
|
return guestViewInternal.attachGuest(this.internalInstanceId, this.guestInstanceId, this.buildParams())
|
|
}
|
|
}
|
|
|
|
// Registers browser plugin <object> custom element.
|
|
const registerBrowserPluginElement = function () {
|
|
const proto = Object.create(HTMLObjectElement.prototype)
|
|
proto.createdCallback = function () {
|
|
this.setAttribute('type', 'application/browser-plugin')
|
|
this.setAttribute('id', `browser-plugin-${getNextId()}`)
|
|
|
|
// The <object> node fills in the <webview> container.
|
|
this.style.flex = '1 1 auto'
|
|
}
|
|
proto.attributeChangedCallback = function (name, oldValue, newValue) {
|
|
const internal = v8Util.getHiddenValue(this, 'internal')
|
|
if (internal) {
|
|
internal.handleBrowserPluginAttributeMutation(name, oldValue, newValue)
|
|
}
|
|
}
|
|
proto.attachedCallback = function () {
|
|
// Load the plugin immediately.
|
|
return this.nonExistentAttribute
|
|
}
|
|
WebViewImpl.BrowserPlugin = webFrame.registerEmbedderCustomElement('browserplugin', {
|
|
'extends': 'object',
|
|
prototype: proto
|
|
})
|
|
delete proto.createdCallback
|
|
delete proto.attachedCallback
|
|
delete proto.detachedCallback
|
|
delete proto.attributeChangedCallback
|
|
}
|
|
|
|
// 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) {
|
|
ipcRenderer.on('ELECTRON_RENDERER_WINDOW_VISIBILITY_CHANGE', internal.onVisibilityChanged)
|
|
guestViewInternal.registerEvents(internal, internal.viewInstanceId)
|
|
internal.elementAttached = true
|
|
const instance = internal.attributes[webViewConstants.ATTRIBUTE_GUESTINSTANCE].getValue()
|
|
if (instance) {
|
|
internal.attachGuestInstance(instance)
|
|
} else {
|
|
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',
|
|
'undo',
|
|
'redo',
|
|
'cut',
|
|
'copy',
|
|
'paste',
|
|
'pasteAndMatchStyle',
|
|
'delete',
|
|
'selectAll',
|
|
'unselect',
|
|
'replace',
|
|
'replaceMisspelling',
|
|
'findInPage',
|
|
'stopFindInPage',
|
|
'getId',
|
|
'downloadURL',
|
|
'inspectServiceWorker',
|
|
'print',
|
|
'printToPDF',
|
|
'showDefinitionForSelection',
|
|
'capturePage',
|
|
'setZoomFactor',
|
|
'setZoomLevel',
|
|
'getZoomLevel',
|
|
'getZoomFactor'
|
|
]
|
|
const nonblockMethods = [
|
|
'insertCSS',
|
|
'insertText',
|
|
'send',
|
|
'sendInputEvent',
|
|
'setLayoutZoomLevelLimits',
|
|
'setVisualZoomLevelLimits',
|
|
// TODO(kevinsawicki): Remove in 2.0, deprecate before then with warnings
|
|
'setZoomLevelLimits'
|
|
]
|
|
|
|
// 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 ${m} because the webContents is unavailable. The WebView must be attached to the DOM and the dom-ready event emitted before this method can be called.`)
|
|
}
|
|
}
|
|
}
|
|
for (const method of methods) {
|
|
proto[method] = createBlockHandler(method)
|
|
}
|
|
|
|
const createNonBlockHandler = function (m) {
|
|
return function (...args) {
|
|
const internal = v8Util.getHiddenValue(this, 'internal')
|
|
ipcRenderer.send('ELECTRON_BROWSER_ASYNC_CALL_TO_GUEST_VIEW', null, internal.guestInstanceId, m, ...args)
|
|
}
|
|
}
|
|
for (const method of nonblockMethods) {
|
|
proto[method] = createNonBlockHandler(method)
|
|
}
|
|
|
|
proto.executeJavaScript = function (code, hasUserGesture, callback) {
|
|
const internal = v8Util.getHiddenValue(this, 'internal')
|
|
if (typeof hasUserGesture === 'function') {
|
|
callback = hasUserGesture
|
|
hasUserGesture = false
|
|
}
|
|
const requestId = getNextId()
|
|
ipcRenderer.send('ELECTRON_BROWSER_ASYNC_CALL_TO_GUEST_VIEW', requestId, internal.guestInstanceId, 'executeJavaScript', code, hasUserGesture)
|
|
ipcRenderer.once(`ELECTRON_RENDERER_ASYNC_CALL_TO_GUEST_VIEW_RESPONSE_${requestId}`, function (event, result) {
|
|
if (callback) callback(result)
|
|
})
|
|
}
|
|
|
|
// WebContents associated with this webview.
|
|
proto.getWebContents = function () {
|
|
return v8Util.getHiddenValue(this, '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
|
|
}
|
|
registerBrowserPluginElement()
|
|
registerWebViewElement()
|
|
window.removeEventListener(event.type, listener, useCapture)
|
|
}
|
|
|
|
window.addEventListener('readystatechange', listener, true)
|
|
|
|
module.exports = WebViewImpl
|