extension/lib/events.coffee

   1 ###
   2 # Copyright Anton Khodakivskiy 2012, 2013, 2014.
   3 # Copyright Simon Lydell 2013, 2014, 2015, 2016.
   4 #
   5 # This file is part of VimFx.
   6 #
   7 # VimFx is free software: you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation, either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # VimFx is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with VimFx.  If not, see <http://www.gnu.org/licenses/>.
  19 ###
  20
  21 # This file sets up all event listeners needed to power VimFx: To know when to
  22 # launch commands and to provide state to them. Events in web page content are
  23 # listened for in events-frame.coffee.
  24
  25 button = require('./button')
  26 messageManager = require('./message-manager')
  27 prefs = require('./prefs')
  28 utils = require('./utils')
  29
  30 HELD_MODIFIERS_ATTRIBUTE = 'vimfx-held-modifiers'
  31
  32 class UIEventManager
  33   constructor: (@vimfx, @window) ->
  34     @listen = utils.listen.bind(null, @window)
  35     @listenOnce = utils.listenOnce.bind(null, @window)
  36
  37     # This flag controls whether to suppress the various key events or not.
  38     @suppress = false
  39
  40     # If a matched shortcut has the `<late>` special key, this flag is set to
  41     # `true`.
  42     @late = false
  43
  44     # When a menu or panel is shown VimFx should temporarily stop processing
  45     # keyboard input, allowing accesskeys to be used.
  46     @popupPassthrough = false
  47
  48   addListeners: ->
  49     checkPassthrough = (value, event) =>
  50       target = event.originalTarget
  51       if target.localName in ['menupopup', 'panel'] and
  52          # Don’t set `@popupPassthrough` to `false` if there actually are popups
  53          # open. This is the case when a sub-menu closes.
  54          (value or not @anyPopupsOpen())
  55         @popupPassthrough = value
  56
  57     @listen('popupshown',  checkPassthrough.bind(null, true))
  58     @listen('popuphidden', checkPassthrough.bind(null, false))
  59
  60     @listen('keydown', (event) =>
  61       # No matter what, always reset the `@suppress` flag, so we don't
  62       # suppress more than intended.
  63       @suppress = false
  64
  65       # Reset the `@late` flag, telling any late listeners for the previous
  66       # event not to run. Also reset the `late` pref, telling frame scripts not
  67       # to do synchronous message passing on every keydown.
  68       @late = false
  69       prefs.set('late', false)
  70
  71       if @popupPassthrough
  72         # The `@popupPassthrough` flag is set a bit unreliably. Sometimes it
  73         # can be stuck as `true` even though no popup is shown, effectively
  74         # disabling the extension. Therefore we check if there actually _are_
  75         # any open popups before stopping processing keyboard input. This is
  76         # only done when popups (might) be open (not on every keystroke) for
  77         # performance reasons.
  78         return if @anyPopupsOpen()
  79         @popupPassthrough = false # No popup was actually open.
  80
  81       return unless vim = @vimfx.getCurrentVim(@window)
  82
  83       @consumeKeyEvent(vim, event)
  84       if @suppress
  85         utils.suppressEvent(event) # This also suppresses the 'keypress' event.
  86       else
  87         # If this keydown event wasn’t suppressed, it’s an obvious interaction
  88         # with the page. If it _was_ suppressed, though, it’s an interaction
  89         # depending on the command triggered; if _it_ calls
  90         # `vim.markPageInteraction()` or not.
  91         vim.markPageInteraction() if vim.isUIEvent(event)
  92     )
  93
  94     @listen('keyup', (event) =>
  95       utils.suppressEvent(event) if @suppress
  96       @setHeldModifiers(event, {filterCurrentOnly: true})
  97     )
  98
  99     @listen('focus', => @setFocusType())
 100     @listen('blur', =>
 101       @window.setTimeout((=>
 102         @setFocusType()
 103       ), @vimfx.options.blur_timeout)
 104     )
 105
 106     @listen('click', (event) =>
 107       target = event.originalTarget
 108       return unless vim = @vimfx.getCurrentVim(@window)
 109
 110       vim.hideNotification()
 111
 112       # In multi-process, clicks simulated by VimFx cannot be caught here. In
 113       # non-multi-process, they unfortunately can. This hack should be
 114       # sufficient for that case until non-multi-process is removed from
 115       # Firefox.
 116       isVimFxGeneratedEvent = (
 117         event.layerX == 0 and event.layerY == 0 and
 118         event.movementX == 0 and event.movementY == 0
 119       )
 120
 121       # If the user clicks the reload button or a link when in hints mode, we’re
 122       # going to end up in hints mode without any markers. Or if the user clicks
 123       # a text input, then that input will be focused, but you can’t type in it
 124       # (instead markers will be matched). So if the user clicks anything in
 125       # hints mode it’s better to leave it.
 126       if vim.mode == 'hints' and not isVimFxGeneratedEvent and
 127          # Exclude the VimFx button, though, since clicking it returns to normal
 128          # mode. Otherwise we’d first return to normal mode and then the button
 129          # would open the help dialog.
 130          target != button.getButton(@window)
 131         vim._enterMode('normal')
 132
 133       vim._send('clearHover') unless isVimFxGeneratedEvent
 134     )
 135
 136     @listen('overflow', (event) =>
 137       target = event.originalTarget
 138       return unless vim = @vimfx.getCurrentVim(@window)
 139       if vim._isUIElement(target)
 140         vim._state.scrollableElements.addChecked(target)
 141     )
 142
 143     @listen('underflow', (event) =>
 144       target = event.originalTarget
 145       return unless vim = @vimfx.getCurrentVim(@window)
 146       if vim._isUIElement(target)
 147         vim._state.scrollableElements.deleteChecked(target)
 148     )
 149
 150     @listen('TabSelect', (event) =>
 151       target = event.originalTarget
 152       target.setAttribute('VimFx-visited', 'true')
 153       @vimfx.emit('TabSelect', {event})
 154
 155       return unless vim = @vimfx.getCurrentVim(@window)
 156       vim.hideNotification()
 157       @vimfx.emit('focusTypeChange', {vim})
 158     )
 159
 160     @listen('TabClose', (event) =>
 161       browser = @window.gBrowser.getBrowserForTab(event.originalTarget)
 162       return unless vim = @vimfx.vims.get(browser)
 163       # Note: `lastClosedVim` must be stored so that any window can access it.
 164       @vimfx.lastClosedVim = vim
 165     )
 166
 167     messageManager.listen('cachedPageshow', ((data, callback, browser) =>
 168       [oldVim, @vimfx.lastClosedVim] = [@vimfx.lastClosedVim, null]
 169       unless oldVim
 170         callback(false)
 171         return
 172
 173       if @vimfx.vims.has(browser)
 174         vim = @vimfx.vims.get(browser)
 175         if vim._messageManager == vim.browser.messageManager
 176           callback(false)
 177           return
 178
 179       # If we get here, it means that we’ve detected a tab dragged from one
 180       # window to another. If so, the `vim` object from the last closed tab (the
 181       # moved tab) should be re-used. See the commit message for commit bb70257d
 182       # for more details.
 183       oldVim._setBrowser(browser)
 184       @vimfx.vims.set(browser, oldVim)
 185       @vimfx.emit('modeChange', {vim: oldVim})
 186       callback(true)
 187     ), {messageManager: @window.messageManager})
 188
 189   setFocusType: ->
 190     return unless vim = @vimfx.getCurrentVim(@window)
 191
 192     activeElement = utils.getActiveElement(@window)
 193
 194     if activeElement == @window.gBrowser.selectedBrowser
 195       vim._send('checkFocusType')
 196       return
 197
 198     focusType = utils.getFocusType(activeElement)
 199     vim._setFocusType(focusType)
 200
 201     if focusType == 'editable' and vim.mode == 'caret'
 202       vim._enterMode('normal')
 203
 204   consumeKeyEvent: (vim, event) ->
 205     match = vim._consumeKeyEvent(event)
 206
 207     if typeof match == 'boolean'
 208       @suppress = match
 209       return
 210
 211     if match
 212       if match.specialKeys['<late>']
 213         @suppress = false
 214         @consumeLateKeydown(vim, event, match)
 215       else
 216         @suppress = vim._onInput(match, event)
 217     else
 218       @suppress = null
 219     @setHeldModifiers(event)
 220
 221   consumeLateKeydown: (vim, event, match) ->
 222     @late = true
 223
 224     # The passed in `event` is the regular non-late browser UI keydown event.
 225     # It is only used to set held keys. This is easier than sending an event
 226     # subset from frame scripts.
 227     listener = ({defaultPrevented}) =>
 228       # `@late` is reset on every keydown. If it is no longer `true`, it means
 229       # that the page called `event.stopPropagation()`, which prevented this
 230       # listener from running for that event.
 231       return unless @late
 232       @suppress =
 233         if defaultPrevented
 234           false
 235         else
 236           vim._onInput(match, event)
 237       @setHeldModifiers(event)
 238       return @suppress
 239
 240     if vim.isUIEvent(event)
 241       @listenOnce('keydown', ((lateEvent) =>
 242         listener(lateEvent)
 243         if @suppress
 244           utils.suppressEvent(lateEvent)
 245           @listenOnce('keyup', utils.suppressEvent, false)
 246       ), false)
 247     else
 248       # Hack to avoid synchronous messages on every keydown (see
 249       # events-frame.coffee).
 250       prefs.set('late', true)
 251       vim._listenOnce('lateKeydown', listener)
 252
 253   setHeldModifiers: (event, {filterCurrentOnly = false} = {}) ->
 254     mainWindow = @window.document.documentElement
 255     modifiers =
 256       if filterCurrentOnly
 257         mainWindow.getAttribute(HELD_MODIFIERS_ATTRIBUTE)
 258       else
 259         if @suppress == null then 'alt ctrl meta shift' else ''
 260     isHeld = (modifier) -> event["#{modifier}Key"]
 261     mainWindow.setAttribute(
 262       HELD_MODIFIERS_ATTRIBUTE, modifiers.split(' ').filter(isHeld).join(' ')
 263     )
 264
 265   anyPopupsOpen: ->
 266     # The autocomplete popup in text inputs (for example) is technically a
 267     # panel, but it does not respond to keypresses. Therefore
 268     # `[ignorekeys="true"]` is excluded.
 269     #
 270     # coffeelint: disable=max_line_length
 271     # <https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XUL/PopupGuide/PopupKeys#Ignoring_Keys>
 272     # coffeelint: enable=max_line_length
 273     popups = utils.querySelectorAllDeep(
 274       @window, ':-moz-any(menupopup, panel):not([ignorekeys="true"])'
 275     )
 276     for popup in popups
 277       return true if popup.state == 'open'
 278     return false
 279
 280 module.exports = UIEventManager