👈♒ Updated at https://danielx.net/editor/

Author: STRd6

lib/iframe-app.coffee

@@ -13,8 +13,11 @@ state that can respond to messages from the OS.
 
 ###
 
+{Observable} = require "ui"
 Postmaster = require "postmaster"
 
+ObservableObject = require "./observable-object"
+
 {version} = require "../pixie"
 
 module.exports = (opts={}) ->
@@ -69,7 +72,10 @@ module.exports = (opts={}) ->
 
   # TODO: Set menu bar from within app
 
-  # This receives and dispatches the messages from the iframe
+  # This receives messages from the iframe and dispatches messages to the iframe
+  # Apps within ZineOS can communicate to each other via the application object,
+  # while within the iframe they communicate through this postmaster degegate to
+  # their specific application or the system.
   Object.assign postmaster,
     remoteTarget: ->
       frame.contentWindow
@@ -106,7 +112,13 @@ module.exports = (opts={}) ->
     height: height
     iconEmoji: iconEmoji
 
+  signals = ObservableObject()
+
   Object.assign application,
+    # Observable fn that returns an array of [key, Observable(value)] items
+    signals: signals
+    # Expose an observable property that can be updated from within the iframe
+    setSignal: signals.set
     exit: ->
       # TODO: Prompt unsaved, etc.
       setTimeout ->

lib/observable-object.coffee

@@ -0,0 +1,38 @@
+{Observable} = require "ui"
+
+# An object that has an observable fn of entries of [key, Observable(value)] items
+module.exports = ->
+  entries = {}
+  update = Observable 0
+
+  get: (name) ->
+    unless entries[name]?
+      entries[name] ?= Observable()
+      update.increment()
+
+    return entries[name]
+
+  set: (name, value) ->
+    if entries[name]?
+      entries[name](value)
+    else
+      entries[name] ?= Observable value
+      update.increment()
+
+    return value
+
+  remove: (name) ->
+    unless entries[name]?
+      throw new Error "Can't remove #{name}, does not exists"
+
+    delete entries[name]
+    update.increment()
+
+    return true
+
+  entries: Observable ->
+    update() # Trigger a recomputation when entries update
+
+    Object.keys(entries).map (name) ->
+      value = entries[name]
+      [name, value]

system/applications.coffee

@@ -192,6 +192,11 @@ module.exports = (I, self) ->
     icon: "📖"
     associations: ["md", "html"]
     src: "https://danielx.whimsy.space/danielx.net/dr-wiki/"
+  }, {
+    name: "FXZ Edit"
+    icon: "📈"
+    associations: ["fxx", "fxz"]
+    src: "https://danielx.whimsy.space/danielx.net/fxz-edit/"
   }, {
     name: "First"
     icon: " 1️⃣"

test/lib/observable-object.coffee

@@ -0,0 +1,13 @@
+ObservableObject = require "/lib/observable-object"
+
+describe "ObservableObject", ->
+  it "should observe properties", ->
+    o = ObservableObject()
+
+    o.get("cool").observe (v) ->
+      console.log "cool", v
+
+    o.entries.observe console.log
+    o.set "cool", "wat"
+    o.set "jawsome", "2jawsome"
+    o.remove "cool"