mirrors/electron
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages 1 Wiki Activity Actions 1

Optimized the handling of webview attribute mutation

Browse source 
Imported from:
86dff6fc51%5E%21/
This commit is contained in:
Cheng Zhao 2014-12-08 21:06:23 -08:00
parent 4348143fd9
commit ac51207860
2 changed files with 110 additions and 129 deletions
Download patch file Download diff file Expand all files Collapse all files

119
atom/renderer/lib/web-view/web-view.coffee
View file

@ -4,15 +4,6 @@ webViewConstants = require './web-view-constants'
webFrame = require 'web-frame'
remote = require 'remote'
# Attributes.
AUTO_SIZE_ATTRIBUTES = [
webViewConstants.ATTRIBUTE_AUTOSIZE,
webViewConstants.ATTRIBUTE_MAXHEIGHT,
webViewConstants.ATTRIBUTE_MAXWIDTH,
webViewConstants.ATTRIBUTE_MINHEIGHT,
webViewConstants.ATTRIBUTE_MINWIDTH,
]
# ID generator.
nextId = 0
getNextId = -> ++nextId
@ -34,13 +25,11 @@ class WebView
@browserPluginNode = @createBrowserPluginNode()
shadowRoot = @webviewNode.createShadowRoot()
@setupWebViewAttributes()
@setupWebViewSrcAttributeMutationObserver()
@setupFocusPropagation()
@setupWebviewNodeProperties()
@viewInstanceId = getNextId()
# UPSTREAM: new WebViewEvents(this, this.viewInstanceId);
guestViewInternal.registerEvents this, @viewInstanceId
shadowRoot.appendChild @browserPluginNode
@ -95,9 +84,6 @@ class WebView
throw new Error(webViewConstants.ERROR_MSG_CANNOT_INJECT_SCRIPT) unless @guestInstanceId
setupWebviewNodeProperties: ->
for attributeName of @attributes
@attributes[attributeName].define()
# We cannot use {writable: true} property descriptor because we want a
# dynamic getter value.
Object.defineProperty @webviewNode, 'contentWindow',
@ -107,94 +93,17 @@ class WebView
# No setter.
enumerable: true
# The purpose of this mutation observer is to catch assignment to the src
# attribute without any changes to its value. This is useful in the case
# where the webview guest has crashed and navigating to the same address
# spawns off a new process.
setupWebViewSrcAttributeMutationObserver: ->
@srcAndPartitionObserver = new MutationObserver (mutations) =>
for mutation in mutations
oldValue = mutation.oldValue
newValue = @attributes[mutation.attributeName].getValue()
return if oldValue isnt newValue
@handleWebviewAttributeMutation mutation.attributeName, oldValue, newValue
params =
attributes: true,
attributeOldValue: true,
attributeFilter: [
webViewConstants.ATTRIBUTE_SRC
webViewConstants.ATTRIBUTE_PARTITION
webViewConstants.ATTRIBUTE_HTTPREFERRER
]
@srcAndPartitionObserver.observe @webviewNode, params
# 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) ->
# Certain changes (such as internally-initiated changes) to attributes should
# not be handled normally.
if @attributes[attributeName]?.ignoreNextMutation
@attributes[attributeName].ignoreNextMutation = false
if not @attributes[attributeName] or @attributes[attributeName].ignoreMutation
return
if attributeName in AUTO_SIZE_ATTRIBUTES
return unless @guestInstanceId
guestViewInternal.setAutoSize @guestInstanceId,
enableAutoSize: @attributes[webViewConstants.ATTRIBUTE_AUTOSIZE].getValue(),
min:
width: parseInt @attributes[webViewConstants.ATTRIBUTE_MINWIDTH].getValue() || 0
height: parseInt @attributes[webViewConstants.ATTRIBUTE_MINHEIGHT].getValue() || 0
max:
width: parseInt @attributes[webViewConstants.ATTRIBUTE_MAXWIDTH].getValue() || 0
height: parseInt @attributes[webViewConstants.ATTRIBUTE_MAXHEIGHT].getValue() || 0
else if attributeName is webViewConstants.ATTRIBUTE_ALLOWTRANSPARENCY
# We treat null attribute (attribute removed) and the empty string as
# one case.
oldValue ?= ''
newValue ?= ''
return if oldValue is newValue and not @guestInstanceId
guestViewInternal.setAllowTransparency @guestInstanceId, @attributes[webViewConstants.ATTRIBUTE_ALLOWTRANSPARENCY].getValue()
else if attributeName is webViewConstants.ATTRIBUTE_HTTPREFERRER
oldValue ?= ''
newValue ?= ''
if newValue == '' and oldValue != ''
@webviewNode.setAttribute webViewConstants.ATTRIBUTE_HTTPREFERRER, oldValue
@attributes[webViewConstants.ATTRIBUTE_HTTPREFERRER].setValue newValue
# If the httpreferrer changes treat it as though the src changes and reload
# the page with the new httpreferrer.
@parseSrcAttribute()
else if attributeName is webViewConstants.ATTRIBUTE_SRC
# We treat null attribute (attribute removed) and the empty string as
# one case.
oldValue ?= ''
newValue ?= ''
# Once we have navigated, we don't allow clearing the src attribute.
# Once <webview> enters a navigated state, it cannot return to a
# placeholder state.
if newValue == '' and oldValue != ''
# src attribute changes normally initiate a navigation. We suppress
# the next src attribute handler call to avoid reloading the page
# on every guest-initiated navigation.
@ignoreNextSrcAttributeChange = true
@webviewNode.setAttribute webViewConstants.ATTRIBUTE_SRC, oldValue
return
if @ignoreNextSrcAttributeChange
# Don't allow the src mutation observer to see this change.
@srcAndPartitionObserver.takeRecords()
@ignoreNextSrcAttributeChange = false
return
@parseSrcAttribute()
else if attributeName is webViewConstants.ATTRIBUTE_PARTITION
@attributes[webViewConstants.ATTRIBUTE_PARTITION].handleMutation oldValue, newValue
# Let the changed attribute handle its own mutation;
@attributes[attributeName].handleMutation oldValue, newValue
handleBrowserPluginAttributeMutation: (attributeName, oldValue, newValue) ->
if attributeName is webViewConstants.ATTRIBUTE_INTERNALINSTANCEID and !oldValue and !!newValue
@ -330,25 +239,19 @@ class WebView
if isTopLevel and (oldValue != newValue)
# Touching the src attribute triggers a navigation. To avoid
# triggering a page reload on every guest-initiated navigation,
# we use the flag ignoreNextSrcAttributeChange here.
this.ignoreNextSrcAttributeChange = true
this.webviewNode.setAttribute webViewConstants.ATTRIBUTE_SRC, newValue
# we do not handle this mutation
@attributes[webViewConstants.ATTRIBUTE_SRC].setValueIgnoreMutation newValue
onAttach: (storagePartitionId) ->
@attributes[webViewConstants.ATTRIBUTE_PARTITION].setValue storagePartitionId
buildAttachParams: ->
instanceId: @viewInstanceId
userAgentOverride: @userAgentOverride
# Attributes:
allowtransparency: @attributes[webViewConstants.ATTRIBUTE_ALLOWTRANSPARENCY].getValue()
autosize: @attributes[webViewConstants.ATTRIBUTE_AUTOSIZE].getValue()
maxheight: parseInt @attributes[webViewConstants.ATTRIBUTE_MAXHEIGHT].getValue() || 0
maxwidth: parseInt @attributes[webViewConstants.ATTRIBUTE_MAXWIDTH].getValue() || 0
minheight: parseInt @attributes[webViewConstants.ATTRIBUTE_MINHEIGHT].getValue() || 0
minwidth: parseInt @attributes[webViewConstants.ATTRIBUTE_MINWIDTH].getValue() || 0
src: @attributes[webViewConstants.ATTRIBUTE_SRC].getValue()
httpreferrer: @attributes[webViewConstants.ATTRIBUTE_HTTPREFERRER].getValue()
params =
instanceId: @viewInstanceId
userAgentOverride: @userAgentOverride
for attributeName, attribute of @attributes
params[attributeName] = attribute.getValue()
params
attachWindow: (guestInstanceId) ->
@guestInstanceId = guestInstanceId