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class UIComponent
iframeElement: null
iframePort: null
showing: false
iframeFrameId: null
options: null
shadowDOM: null
toggleIframeElementClasses: (removeClass, addClass) ->
@iframeElement.classList.remove removeClass
@iframeElement.classList.add addClass
constructor: (iframeUrl, className, @handleMessage) ->
DomUtils.documentReady =>
styleSheet = DomUtils.createElement "style"
styleSheet.type = "text/css"
# Default to everything hidden while the stylesheet loads.
styleSheet.innerHTML = "iframe {display: none;}"
# Fetch "content_scripts/vimium.css" from chrome.storage.local; the background page caches it there.
chrome.storage.local.get "vimiumCSSInChromeStorage", (items) ->
styleSheet.innerHTML = items.vimiumCSSInChromeStorage
@iframeElement = DomUtils.createElement "iframe"
extend @iframeElement,
className: className
seamless: "seamless"
shadowWrapper = DomUtils.createElement "div"
# PhantomJS doesn't support createShadowRoot, so guard against its non-existance.
@shadowDOM = shadowWrapper.createShadowRoot?() ? shadowWrapper
@shadowDOM.appendChild styleSheet
@shadowDOM.appendChild @iframeElement
@toggleIframeElementClasses "vimiumUIComponentVisible", "vimiumUIComponentHidden"
# Open a port and pass it to the iframe via window.postMessage. We use an AsyncDataFetcher to handle
# requests which arrive before the iframe (and its message handlers) have completed initialization. See
# #1679.
@iframePort = new AsyncDataFetcher (setIframePort) =>
# We set the iframe source and append the new element here (as opposed to above) to avoid a potential
# race condition vis-a-vis the "load" event (because this callback runs on "nextTick").
@iframeElement.src = chrome.runtime.getURL iframeUrl
document.documentElement.appendChild shadowWrapper
@iframeElement.addEventListener "load", =>
# Get vimiumSecret so the iframe can determine that our message isn't the page impersonating us.
chrome.storage.local.get "vimiumSecret", ({ vimiumSecret }) =>
{ port1, port2 } = new MessageChannel
@iframeElement.contentWindow.postMessage vimiumSecret, chrome.runtime.getURL(""), [ port2 ]
port1.onmessage = (event) =>
switch event?.data?.name ? event?.data
when "uiComponentIsReady"
# If any other frame receives the focus, then hide the UI component.
chrome.runtime.onMessage.addListener ({name, focusFrameId}) =>
if name == "frameFocused" and @options?.focus and focusFrameId not in [frameId, @iframeFrameId]
@hide false
false # We will not be calling sendResponse.
# If this frame receives the focus, then hide the UI component.
window.addEventListener "focus", (event) =>
if event.target == window and @options?.focus and not @options?.allowBlur
@hide false
true # Continue propagating the event.
# Set the iframe's port, thereby rendering the UI component ready.
setIframePort port1
when "setIframeFrameId" then @iframeFrameId = event.data.iframeFrameId
when "hide" then @hide()
else @handleMessage event
# Post a message (if provided), then call continuation (if provided). We wait for documentReady() to ensure
# that the @iframePort set (so that we can use @iframePort.use()).
postMessage: (message = null, continuation = null) ->
DomUtils.documentReady =>
@iframePort.use (port) ->
port.postMessage message if message?
continuation?()
activate: (@options = null) ->
@postMessage @options, =>
@toggleIframeElementClasses "vimiumUIComponentHidden", "vimiumUIComponentVisible"
@iframeElement.focus() if @options?.focus
@showing = true
hide: (shouldRefocusOriginalFrame = true) ->
# We post a non-message (null) to ensure that hide() requests cannot overtake activate() requests.
@postMessage null, =>
if @showing
@showing = false
@toggleIframeElementClasses "vimiumUIComponentVisible", "vimiumUIComponentHidden"
if @options?.focus
@iframeElement.blur()
if shouldRefocusOriginalFrame
if @options?.sourceFrameId?
chrome.runtime.sendMessage
handler: "sendMessageToFrames",
message: name: "focusFrame", frameId: @options.sourceFrameId, forceFocusThisFrame: true
else
window.focus()
@options = null
@postMessage "hidden" # Inform the UI component that it is hidden.
root = exports ? window
root.UIComponent = UIComponent
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