packages/window-utils.coffee

   1 { classes: Cc, interfaces: Ci, utils: Cu } = Components
   2
   3 tools = {}
   4 Cu.import "resource://gre/modules/Services.jsm", tools
   5
   6 ww = tools.Services.ww
   7
   8 runOnWindowLoad = (callback, window) ->
   9   if window.document.readyState == 'complete'
  10     callback window
  11   else
  12     onLoad = ->
  13       window.removeEventListener 'load', arguments.callee, false
  14       callback(window)
  15
  16     window.addEventListener 'load', onLoad, false
  17
  18 applyToWindows = (callback) ->
  19   winEnum = ww.getWindowEnumerator()
  20   while winEnum.hasMoreElements()
  21     window = winEnum.getNext().QueryInterface(Ci.nsIDOMWindow)
  22     runOnWindowLoad callback, window
  23
  24 isBrowserWindow = (window) ->
  25   return window.document.documentElement.getAttribute("windowtype") == "navigator:browser"
  26
  27 class WindowObserver
  28   constructor: (@delegate) ->
  29
  30   observe: (subject, topic, data) ->
  31     window = subject.QueryInterface(Ci.nsIDOMWindow)
  32     switch topic
  33       when 'domwindowopened'
  34         runOnWindowLoad @delegate.track, window
  35       when 'domwindowclosed'
  36         runOnWindowLoad @delegate.untrack, window
  37
  38 class WindowTracker
  39
  40   constructor: (@delegate) ->
  41     @observer = new WindowObserver @delegate
  42
  43   start: ->
  44     applyToWindows @delegate.track
  45     ww.registerNotification @observer
  46
  47   stop: ->
  48     ww.unregisterNotification @observer
  49     applyToWindows @delegate.untrack
  50
  51
  52 exports.runOnWindowLoad = runOnWindowLoad
  53 exports.applyToWindows = applyToWindows
  54 exports.WindowTracker = WindowTracker
  55 exports.isBrowserWindow = isBrowserWindow