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class UIComponent
iframeElement: null
iframePort: null
showing: null
constructor: (iframeUrl, className, @handleMessage) ->
@iframeElement = document.createElement "iframe"
@iframeElement.className = className
@iframeElement.seamless = "seamless"
@iframeElement.src = chrome.runtime.getURL iframeUrl
@iframeElement.addEventListener "load", => @openPort()
document.documentElement.appendChild @iframeElement
@showing = true # The iframe is visible now.
# Hide the iframe, but don't interfere with the focus.
@hide false
# Open a port and pass it to the iframe via window.postMessage.
openPort: ->
messageChannel = new MessageChannel()
@iframePort = messageChannel.port1
@iframePort.onmessage = (event) => @handleMessage event
# Get vimiumSecret so the iframe can determine that our message isn't the page impersonating us.
chrome.storage.local.get "vimiumSecret", ({vimiumSecret: secret}) =>
@iframeElement.contentWindow.postMessage secret, chrome.runtime.getURL(""), [messageChannel.port2]
postMessage: (message) ->
@iframePort.postMessage message
activate: (message) ->
@postMessage message if message?
@show() unless @showing
@iframeElement.focus()
show: (message) ->
@postMessage message if message?
@iframeElement.classList.remove "vimiumUIComponentHidden"
@iframeElement.classList.add "vimiumUIComponentShowing"
window.addEventListener "focus", @onFocus = (event) =>
if event.target == window
window.removeEventListener "focus", @onFocus
@onFocus = null
@postMessage "hide"
@showing = true
hide: (focusWindow = true)->
@iframeElement.classList.remove "vimiumUIComponentShowing"
@iframeElement.classList.add "vimiumUIComponentHidden"
window.removeEventListener "focus", @onFocus if @onFocus
@onFocus = null
window.focus() if focusWindow
@showing = false
root = exports ? window
root.UIComponent = UIComponent
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