packages/prefs.coffee

   1 { classes: Cc, interfaces: Ci } = Components
   2
   3 PREF_BRANCH = "extension.VimFx.";
   4
   5 # Default values for the preference
   6 # All used preferences should be mentioned here becuase
   7 # preference type is derived from here
   8 PREFS =
   9   hint_chars: 'asdfgercvhjkl;uinm'
  10   button_id: 'VimFx-toolbar-button'
  11   disabled: false
  12
  13 # Get Firefox preference value of type specified in `PREFS`
  14 getFFPref = do ->
  15   branch = Services.prefs.getBranch PREF_BRANCH
  16
  17   return (key) ->
  18     value = PREFS[key]
  19
  20     # Return default value if the preference value hasn't been set yet
  21     if branch.getPrefType(key) == branch.PREF_INVALID
  22       return value;
  23
  24     switch typeof value
  25       when 'boolean'
  26         return branch.getBoolPref key
  27       when 'number'
  28         return branch.getIntPref key
  29       else
  30         return branch.getCharPref key
  31
  32 # Set firefox preference value
  33 setFFPref = do ->
  34   branch = Services.prefs.getBranch PREF_BRANCH
  35
  36   return (key, value) ->
  37     switch typeof value
  38       when 'boolean'
  39         branch.setBoolPref(key, value)
  40       when 'number'
  41         branch.setIntPref(key, value)
  42       else
  43         branch.setCharPref(key, String(value));
  44
  45 # Set default values and update previously stored values for the preferences
  46 do ->
  47   branch = Services.prefs.getBranch PREF_BRANCH
  48   for key in Object.keys(PREFS)
  49     if branch.getPrefType(key) == branch.PREF_INVALID
  50       setFFPref key, PREFS[key]
  51     else
  52       PREFS[key] = getFFPref key
  53
  54 # Monitor preference changes and update values in local cache - PREFS
  55 installPrefObserver = ->
  56   branch = Services.prefs.getBranch(PREF_BRANCH)
  57     .QueryInterface(Components.interfaces.nsIPrefBranch2)
  58
  59   observer =
  60     observe: (subject, topic, data) ->
  61       if topic == 'nsPref:changed' and data in Object.keys(PREFS)
  62         PREFS[data] = getFFPref data
  63
  64   branch.addObserver "", observer, false
  65   unload -> branch.removeObserver "", observer
  66
  67 # Get preference value from local cache - PREFS
  68 getPref = (key) -> return PREFS[key]
  69
  70 # Set preference value
  71 setPref = (key, value) -> setFFPref key, value
  72
  73 exports.getPref             = getPref
  74 exports.setPref             = setPref
  75 exports.installPrefObserver = installPrefObserver