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events.coffee 

utils           = require 'utils'
{ getCommand }  = require 'commands'
{ Vim }         = require 'vim'
{ getPref }     = require 'prefs'

{ interfaces: Ci } = Components

vimBucket = new utils.Bucket utils.getWindowId, (obj) -> new Vim obj

suppressEvent = (event) ->
  event.preventDefault()
  event.stopPropagation()

The following handlers are installed on every top level DOM window

 
handlers = 
  'keydown': (event) ->
    if getPref 'disabled'
      return

    try
      isEditable =  utils.isElementEditable event.originalTarget
      keyStr = utils.keyboardEventKeyString event

We only handle the key if there is no focused editable element or if it's the Esc key, which will remote the focus from the currently focused element

 
      if keyStr and (keyStr == 'Esc' or not isEditable)
        if window = utils.getCurrentTabWindow event
          if vimBucket.get(window)?.pushKey keyStr
            suppressEvent event
    catch err
      console.log err

  'keypress': (event) ->
    if getPref 'disabled'
      return

    try

Try to execute keys that were accumulated so far. Suppress event if there is a matching command.

 
      if window = utils.getCurrentTabWindow event
        if vimBucket.get(window)?.execKeys()
          suppressEvent event
    catch err
      console.log err

  'TabClose': (event) ->
    if gBrowser = utils.getEventTabBrowser event
      if browser = gBrowser.getBrowserForTab event.originalTarget
        vimBucket.forget browser.contentWindow.wrappedJSObject

When the top level window closes we should release all Vims that were associated with tabs in this window

 
  'DOMWindowClose': (event) ->
    if gBrowser = event.originalTarget.gBrowser
      for tab in gBrowser.tabs
        if browser = gBrowser.getBrowserForTab tab
          vimBucket.forget browser.contentWindow.wrappedJSObject

addEventListeners = (window) ->
  for name, handler of handlers
    window.addEventListener name, handler, true

  removeEventListeners = ->
    for name, handler of handlers
      window.removeEventListener name, handler, true

  unload -> removeEventListeners window

exports.addEventListeners = addEventListeners