1 files changed, 57 insertions, 0 deletions
diff --git a/toolkit/jetpack/sdk/content/events.js b/toolkit/jetpack/sdk/content/events.js
new file mode 100644
index 000000000..c085b6179
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/events.js
@@ -0,0 +1,57 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+const { Ci } = require("chrome");
+const { open } = require("../event/dom");
+const { observe } = require("../event/chrome");
+const { filter, merge, map, expand } = require("../event/utils");
+const { windows } = require("../window/utils");
+const { events: windowEvents } = require("sdk/window/events");
+
+// Note: Please note that even though pagehide event is included
+// it's not observable reliably since it's not always triggered
+// when closing tabs. Implementation can be imrpoved once that
+// event will be necessary.
+var TYPES = ["DOMContentLoaded", "load", "pageshow", "pagehide"];
+
+var insert = observe("document-element-inserted");
+var windowCreate = merge([
+  observe("content-document-global-created"),
+  observe("chrome-document-global-created")
+]);
+var create = map(windowCreate, function({target, data, type}) {
+  return { target: target.document, type: type, data: data }
+});
+
+function streamEventsFrom({document}) {
+  // Map supported event types to a streams of those events on the given
+  // `window` for the inserted document and than merge these streams into
+  // single form stream off all window state change events.
+  let stateChanges = TYPES.map(function(type) {
+    return open(document, type, { capture: true });
+  });
+
+  // Since load events on document occur for every loded resource
+  return filter(merge(stateChanges), function({target}) {
+    return target instanceof Ci.nsIDOMDocument
+  })
+}
+exports.streamEventsFrom = streamEventsFrom;
+
+var opened = windows(null, { includePrivate: true });
+var state = merge(opened.map(streamEventsFrom));
+
+
+var futureReady = filter(windowEvents, ({type}) =>
+                                        type === "DOMContentLoaded");
+var futureWindows = map(futureReady, ({target}) => target);
+var futureState = expand(futureWindows, streamEventsFrom);
+
+exports.events = merge([insert, create, state, futureState]);