From 049a37aa0e7d37cafd979e7d470c7649700b5010 Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <noreply@fakecake.org>
Date: Sat, 1 Dec 2018 17:05:28 +0300
Subject: [PATCH] WIP reshuffling of JS global context into separate logical
 objects

---
 classes/article.php               |   2 +-
 classes/dlg.php                   |   2 +-
 classes/feeds.php                 |  16 +-
 classes/pref/feeds.php            |   6 +-
 js/FeedTree.js                    |   2 +-
 js/feedlist.js                    | 697 ++++++++++++++-----------
 js/functions.js                   | 178 ++++---
 js/prefs.js                       |  26 +-
 js/tt-rss.js                      | 635 +++++++++-------------
 js/viewfeed.js                    | 842 ++++++++++++++----------------
 plugins/af_psql_trgm/init.php     |   2 +-
 plugins/close_button/init.php     |   2 +-
 plugins/embed_original/init.js    |   6 +-
 plugins/no_title_counters/init.js |   2 +-
 plugins/toggle_sidebar/init.php   |   2 +-
 15 files changed, 1151 insertions(+), 1269 deletions(-)

diff --git a/classes/article.php b/classes/article.php
index 50a61a019..bc2e76537 100755
--- a/classes/article.php
+++ b/classes/article.php
@@ -877,7 +877,7 @@ class Article extends Handler_Protected {
 			$tags_str = "";
 
 			for ($i = 0; $i < $maxtags; $i++) {
-				$tags_str .= "<a class=\"tag\" href=\"#\" onclick=\"viewfeed({feed:'".$tags[$i]."'})\">" . $tags[$i] . "</a>, ";
+				$tags_str .= "<a class=\"tag\" href=\"#\" onclick=\"Feeds.viewfeed({feed:'".$tags[$i]."'})\">" . $tags[$i] . "</a>, ";
 			}
 
 			$tags_str = mb_substr($tags_str, 0, mb_strlen($tags_str)-2);
diff --git a/classes/dlg.php b/classes/dlg.php
index 9ac5cd12f..d73a53618 100644
--- a/classes/dlg.php
+++ b/classes/dlg.php
@@ -139,7 +139,7 @@ class Dlg extends Handler_Protected {
 
 			$key_escaped = str_replace("'", "\\'", $key);
 
-			echo "<a href=\"javascript:viewfeed({feed:'$key_escaped'}) \" style=\"font-size: " .
+			echo "<a href=\"#\" onclick=\"Feeds.viewfeed({feed:'$key_escaped'}) \" style=\"font-size: " .
 				$size . "px\" title=\"$value articles tagged with " .
 				$key . '">' . $key . '</a> ';
 		}
diff --git a/classes/feeds.php b/classes/feeds.php
index b548205ed..93e44e3bb 100755
--- a/classes/feeds.php
+++ b/classes/feeds.php
@@ -51,7 +51,7 @@ class Feeds extends Handler_Protected {
 		$reply .= "<span class='r'>
 			<a href=\"#\"
 				title=\"".__("View as RSS feed")."\"
-				onclick=\"displayDlg('".__("View as RSS")."','generatedFeed', '$feed_id:$is_cat:$rss_link')\">
+				onclick=\"Utils.displayDlg('".__("View as RSS")."','generatedFeed', '$feed_id:$is_cat:$rss_link')\">
 				<img class=\"noborder\" src=\"images/pub_set.png\"></a>";
 
 
@@ -137,7 +137,7 @@ class Feeds extends Handler_Protected {
 
 		//$reply .= "<option value=\"catchupPage()\">".__('Mark as read')."</option>";
 
-		$reply .= "<option value=\"displayDlg('".__("View as RSS")."','generatedFeed', '$feed_id:$is_cat:$rss_link')\">".__('View as RSS')."</option>";
+		$reply .= "<option value=\"Utils.displayDlg('".__("View as RSS")."','generatedFeed', '$feed_id:$is_cat:$rss_link')\">".__('View as RSS')."</option>";
 
 		$reply .= "</select>";
 
@@ -392,7 +392,7 @@ class Feeds extends Handler_Protected {
 
 							$reply['content'] .= "<div data-feed-id='$feed_id' class='feed-titl'>".
 								"<div style='float : right'>$feed_icon_img</div>".
-								"<a class='title' href=\"#\" onclick=\"viewfeed({feed:$feed_id})\">".
+								"<a class='title' href=\"#\" onclick=\"Feeds.viewfeed({feed:$feed_id})\">".
 								$line["feed_title"]."</a>
                             $vf_catchup_link</div>";
 
@@ -434,7 +434,7 @@ class Feeds extends Handler_Protected {
 						if (@$line["feed_title"]) {
 							$rgba = @$rgba_cache[$feed_id];
 
-							$reply['content'] .= "<span class=\"feed\"><a style=\"background : rgba($rgba, 0.3)\" href=\"#\" onclick=\"viewfeed({feed:$feed_id})\">".
+							$reply['content'] .= "<span class=\"feed\"><a style=\"background : rgba($rgba, 0.3)\" href=\"#\" onclick=\"Feeds.viewfeed({feed:$feed_id})\">".
 								truncate_string($line["feed_title"],30)."</a></span>";
 						}
 					}
@@ -451,7 +451,7 @@ class Feeds extends Handler_Protected {
 
 					if ($line["feed_title"] && !$vfeed_group_enabled) {
 
-						$reply['content'] .= "<span onclick=\"viewfeed({feed:$feed_id})\"
+						$reply['content'] .= "<span onclick=\"Feeds.viewfeed({feed:$feed_id})\"
                         style=\"cursor : pointer\"
                         title=\"".htmlspecialchars($line['feed_title'])."\">
                         $feed_icon_img</span>";
@@ -488,7 +488,7 @@ class Feeds extends Handler_Protected {
 
 							$reply['content'] .= "<div data-feed-id='$feed_id' class='feed-title'>".
 								"<div style=\"float : right\">$feed_icon_img</div>".
-								"<a href=\"#\" class='title' onclick=\"viewfeed({feed:$feed_id})\">".
+								"<a href=\"#\" class='title' onclick=\"Feeds.viewfeed({feed:$feed_id})\">".
 								$line["feed_title"]."</a> $vf_catchup_link</div>";
 
 						}
@@ -547,7 +547,7 @@ class Feeds extends Handler_Protected {
 
 							$tmp_content .= "<div class=\"feed\">
                             <a href=\"#\" style=\"background-color: rgba($rgba,0.3)\"
-                            onclick=\"viewfeed({feed:$feed_id})\">".
+                            onclick=\"Feeds.viewfeed({feed:$feed_id})\">".
 								truncate_string($line["feed_title"],30)."</a>
                         </div>";
 						}
@@ -561,7 +561,7 @@ class Feeds extends Handler_Protected {
 					if (!get_pref("VFEED_GROUP_BY_FEED") && $line["feed_title"]) {
 						$tmp_content .= "<span style=\"cursor : pointer\"
                         title=\"".htmlspecialchars($line["feed_title"])."\"
-                        onclick=\"viewfeed({feed:$feed_id})\">$feed_icon_img</span>";
+                        onclick=\"Feeds.viewfeed({feed:$feed_id})\">$feed_icon_img</span>";
 					}
 					$tmp_content .= "</div>"; //score wrapper2
 
diff --git a/classes/pref/feeds.php b/classes/pref/feeds.php
index 43570c740..23e9baee9 100755
--- a/classes/pref/feeds.php
+++ b/classes/pref/feeds.php
@@ -1174,7 +1174,7 @@ class Pref_Feeds extends Handler_Protected {
 		print "<div style='float : right; padding-right : 4px;'>
 			<input dojoType=\"dijit.form.TextBox\" id=\"feed_search\" size=\"20\" type=\"search\"
 				value=\"$feed_search\">
-			<button dojoType=\"dijit.form.Button\" onclick=\"updateFeedList()\">".
+			<button dojoType=\"dijit.form.Button\" onclick=\"Feeds.reload()\">".
 				__('Search')."</button>
 			</div>";
 
@@ -1306,7 +1306,7 @@ class Pref_Feeds extends Handler_Protected {
 
 		print_warning("Published OPML does not include your Tiny Tiny RSS settings, feeds that require authentication or feeds hidden from Popular feeds.");
 
-		print "<button dojoType=\"dijit.form.Button\" onclick=\"return displayDlg('".__("Public OPML URL")."','pubOPMLUrl')\">".
+		print "<button dojoType=\"dijit.form.Button\" onclick=\"return Utils.displayDlg('".__("Public OPML URL")."','pubOPMLUrl')\">".
 			__('Display published OPML URL')."</button> ";
 
 		PluginHost::getInstance()->run_hooks(PluginHost::HOOK_PREFS_TAB_SECTION,
@@ -1323,7 +1323,7 @@ class Pref_Feeds extends Handler_Protected {
 
 		print "<p>";
 
-		print "<button dojoType=\"dijit.form.Button\" onclick=\"return displayDlg('".__("View as RSS")."','generatedFeed', '$rss_url')\">".
+		print "<button dojoType=\"dijit.form.Button\" onclick=\"return Utils.displayDlg('".__("View as RSS")."','generatedFeed', '$rss_url')\">".
 			__('Display URL')."</button> ";
 
 		print "<button class=\"warning\" dojoType=\"dijit.form.Button\" onclick=\"return clearFeedAccessKeys()\">".
diff --git a/js/FeedTree.js b/js/FeedTree.js
index b37d339c2..21a19bf85 100755
--- a/js/FeedTree.js
+++ b/js/FeedTree.js
@@ -97,7 +97,7 @@ define(["dojo/_base/declare", "dojo/dom-construct", "dijit/Tree", "dijit/Menu"],
 				menu.addChild(new dijit.MenuItem({
 					label: __("Mark all feeds as read"),
 					onClick: function() {
-						catchupAllFeeds();
+						Feeds.catchupAllFeeds();
 					}}));
 
 				menu.bindDomNode(tnode.domNode);
diff --git a/js/feedlist.js b/js/feedlist.js
index 4d5dbe2ac..b808451b4 100644
--- a/js/feedlist.js
+++ b/js/feedlist.js
@@ -1,302 +1,430 @@
-let infscroll_in_progress = 0;
-let infscroll_disabled = 0;
-
-let _infscroll_timeout = false;
-let _search_query = false;
-let _viewfeed_wait_timeout = false;
-
 let counters_last_request = 0;
-let _counters_prev = [];
 
-function resetCounterCache() {
-	_counters_prev = [];
-}
+const Counters = {
+};
 
-function loadMoreHeadlines() {
-	const view_mode = document.forms["main_toolbar_form"].view_mode.value;
-	const unread_in_buffer = $$("#headlines-frame > div[id*=RROW][class*=Unread]").length;
-	const num_all = $$("#headlines-frame > div[id*=RROW]").length;
-	const num_unread = getFeedUnread(getActiveFeedId(), activeFeedIsCat());
+const Feeds = {
+	_active_feed_id: 0,
+	_active_feed_is_cat: false,
+	infscroll_in_progress: 0,
+	infscroll_disabled: 0,
+	_infscroll_timeout: false,
+	_search_query: false,
+	_viewfeed_wait_timeout: false,
+	_counters_prev: [],
+	// NOTE: this implementation is incomplete
+	// for general objects but good enough for counters
+	// http://adripofjavascript.com/blog/drips/object-equality-in-javascript.html
+	counterEquals: function(a, b) {
+		// Create arrays of property names
+		const aProps = Object.getOwnPropertyNames(a);
+		const bProps = Object.getOwnPropertyNames(b);
 
-	// TODO implement marked & published
-
-	let offset = num_all;
-
-	switch (view_mode) {
-		case "marked":
-		case "published":
-			console.warn("loadMoreHeadlines: ", view_mode, "not implemented");
-			break;
-		case "unread":
-			offset = unread_in_buffer;
-			break;
-		case "adaptive":
-			if (!(getActiveFeedId() == -1 && !activeFeedIsCat()))
-				offset = num_unread > 0 ? unread_in_buffer : num_all;
-			break;
-	}
-
-	console.log("loadMoreHeadlines, offset=", offset);
-
-	viewfeed({feed: getActiveFeedId(), is_cat: activeFeedIsCat(), offset: offset, infscroll_req: true});
-}
-
-function cleanup_memory(root) {
-	const dijits = dojo.query("[widgetid]", dijit.byId(root).domNode).map(dijit.byNode);
-
-	dijits.each(function (d) {
-		dojo.destroy(d.domNode);
-	});
-
-	$$("#" + root + " *").each(function (i) {
-		i.parentNode ? i.parentNode.removeChild(i) : true;
-	});
-}
-
-function viewfeed(params) {
-	const feed = params.feed;
-	const is_cat = !!params.is_cat || false;
-	const offset = params.offset || 0;
-	const viewfeed_debug = params.viewfeed_debug;
-	const method = params.method;
-	// this is used to quickly switch between feeds, sets active but xhr is on a timeout
-	const delayed = params.delayed || false;
-
-	if (feed != getActiveFeedId() || activeFeedIsCat() != is_cat) {
-		_search_query = false;
-	}
-
-	if (offset != 0) {
-		if (infscroll_in_progress)
-			return;
-
-		infscroll_in_progress = 1;
-
-		window.clearTimeout(_infscroll_timeout);
-		_infscroll_timeout = window.setTimeout(() => {
-			console.log('infscroll request timed out, aborting');
-			infscroll_in_progress = 0;
-
-			// call scroll handler to maybe repeat infscroll request
-			headlinesScrollHandler();
-		}, 10 * 1000);
-	}
-
-	Form.enable("main_toolbar_form");
-
-	let query = Object.assign({op: "feeds", method: "view", feed: feed},
-		dojo.formToObject("main_toolbar_form"));
-
-	if (method) query.m = method;
-
-	if (offset > 0) {
-		if (current_first_id) {
-			query.fid = current_first_id;
-		}
-	}
-
-	if (_search_query) {
-		query = Object.assign(query, _search_query);
-	}
-
-	if (offset != 0) {
-		query.skip = offset;
-
-		// to prevent duplicate feed titles when showing grouped vfeeds
-		if (vgroup_last_feed) {
-			query.vgrlf = vgroup_last_feed;
-		}
-	} else if (!is_cat && feed == getActiveFeedId() && !params.method) {
-			query.m = "ForceUpdate";
+		// If number of properties is different,
+		// objects are not equivalent
+		if (aProps.length != bProps.length) {
+			return false;
 		}
 
-	Form.enable("main_toolbar_form");
+		for (let i = 0; i < aProps.length; i++) {
+			const propName = aProps[i];
 
-	if (!delayed)
-		if (!setFeedExpandoIcon(feed, is_cat,
-			(is_cat) ? 'images/indicator_tiny.gif' : 'images/indicator_white.gif'))
-				notify_progress("Loading, please wait...", true);
+			// If values of same property are not equal,
+			// objects are not equivalent
+			if (a[propName] !== b[propName]) {
+				return false;
+			}
+		}
 
-	query.cat = is_cat;
+		// If we made it this far, objects
+		// are considered equivalent
+		return true;
+	},
+	resetCounters: function () {
+		this._counters_prev = [];
+	},
+	parseCounters: function (elems) {
+		for (let l = 0; l < elems.length; l++) {
 
-	setActiveFeedId(feed, is_cat);
+			if (this._counters_prev[l] && this.counterEquals(elems[l], this._counters_prev[l])) {
+				continue;
+			}
 
-	if (viewfeed_debug) {
-		window.open("backend.php?" +
-			dojo.objectToQuery(
-				Object.assign({debug: 1, csrf_token: getInitParam("csrf_token")}, query)
-			));
-	}
+			const id = elems[l].id;
+			const kind = elems[l].kind;
+			const ctr = parseInt(elems[l].counter);
+			const error = elems[l].error;
+			const has_img = elems[l].has_img;
+			const updated = elems[l].updated;
+			const auxctr = parseInt(elems[l].auxcounter);
+
+			if (id == "global-unread") {
+				App.global_unread = ctr;
+				App.updateTitle();
+				continue;
+			}
+
+			if (id == "subscribed-feeds") {
+				/* feeds_found = ctr; */
+				continue;
+			}
+
+			/*if (getFeedUnread(id, (kind == "cat")) != ctr ||
+					(kind == "cat")) {
+			}*/
+
+			setFeedUnread(id, (kind == "cat"), ctr);
+			setFeedValue(id, (kind == "cat"), 'auxcounter', auxctr);
+
+			if (kind != "cat") {
+				setFeedValue(id, false, 'error', error);
+				setFeedValue(id, false, 'updated', updated);
+
+				if (id > 0) {
+					if (has_img) {
+						setFeedIcon(id, false,
+							getInitParam("icons_url") + "/" + id + ".ico?" + has_img);
+					} else {
+						setFeedIcon(id, false, 'images/blank_icon.gif');
+					}
+				}
+			}
+		}
+
+		this.hideOrShowFeeds(getInitParam("hide_read_feeds") == 1);
+		this._counters_prev = elems;
+	},
+	viewCurrentFeed: function(method) {
+		console.log("viewCurrentFeed: " + method);
+
+		if (this.getActiveFeedId() != undefined) {
+			this.viewfeed({feed: Feeds.getActiveFeedId(), is_cat: Feeds.activeFeedIsCat(), method: method});
+		}
+		return false; // block unneeded form submits
+	},
+	openNextUnreadFeed: function() {
+		const is_cat = Feeds.activeFeedIsCat();
+		const nuf = getNextUnreadFeed(Feeds.getActiveFeedId(), is_cat);
+		if (nuf) this.viewfeed({feed: nuf, is_cat: is_cat});
+	},
+	collapseFeedlist: function() {
+		Element.toggle("feeds-holder");
+
+		const splitter = $("feeds-holder_splitter");
+
+		Element.visible("feeds-holder") ? splitter.show() : splitter.hide();
+
+		dijit.byId("main").resize();
+	},
+	cancelSearch: function() {
+		this._search_query = "";
+		Feeds.viewCurrentFeed();
+	},
+	requestCounters: function(force) {
+		const date = new Date();
+		const timestamp = Math.round(date.getTime() / 1000);
+
+		if (force || timestamp - counters_last_request > 5) {
+			console.log("scheduling request of counters...");
+
+			counters_last_request = timestamp;
+
+			let query = {op: "rpc", method: "getAllCounters", seq: App.next_seq()};
+
+			if (!force)
+				query.last_article_id = getInitParam("last_article_id");
 
-	window.clearTimeout(_viewfeed_wait_timeout);
-	_viewfeed_wait_timeout = window.setTimeout(() => {
-		catchupBatchedArticles(() => {
 			xhrPost("backend.php", query, (transport) => {
+				App.handleRpcJson(transport);
+			});
+
+		} else {
+			console.log("request_counters: rate limit reached: " + (timestamp - counters_last_request));
+		}
+	},
+	reload: function() {
+		try {
+			Element.show("feedlistLoading");
+
+			this.resetCounters();
+
+			if (dijit.byId("feedTree")) {
+				dijit.byId("feedTree").destroyRecursive();
+			}
+
+			const store = new dojo.data.ItemFileWriteStore({
+				url: "backend.php?op=pref_feeds&method=getfeedtree&mode=2"
+			});
+
+			const treeModel = new fox.FeedStoreModel({
+				store: store,
+				query: {
+					"type": getInitParam('enable_feed_cats') == 1 ? "category" : "feed"
+				},
+				rootId: "root",
+				rootLabel: "Feeds",
+				childrenAttrs: ["items"]
+			});
+
+			const tree = new fox.FeedTree({
+				model: treeModel,
+				onClick: function (item, node) {
+					const id = String(item.id);
+					const is_cat = id.match("^CAT:");
+					const feed = id.substr(id.indexOf(":") + 1);
+					Feeds.viewfeed({feed: feed, is_cat: is_cat});
+					return false;
+				},
+				openOnClick: false,
+				showRoot: false,
+				persist: true,
+				id: "feedTree",
+			}, "feedTree");
+
+			const tmph = dojo.connect(dijit.byId('feedMenu'), '_openMyself', function (event) {
+				console.log(dijit.getEnclosingWidget(event.target));
+				dojo.disconnect(tmph);
+			});
+
+			$("feeds-holder").appendChild(tree.domNode);
+
+			const tmph2 = dojo.connect(tree, 'onLoad', function () {
+				dojo.disconnect(tmph2);
+				Element.hide("feedlistLoading");
+
 				try {
-					setFeedExpandoIcon(feed, is_cat, 'images/blank_icon.gif');
-					headlines_callback2(transport, offset);
-					PluginHost.run(PluginHost.HOOK_FEED_LOADED, [feed, is_cat]);
+					Feeds.init();
+					setLoadingProgress(25);
 				} catch (e) {
 					exception_error(e);
 				}
 			});
+
+			tree.startup();
+		} catch (e) {
+			exception_error(e);
+		}
+	},
+	init: function() {
+		console.log("in feedlist init");
+
+		setLoadingProgress(50);
+
+		document.onkeydown = App.hotkeyHandler;
+		setInterval(hotkeyPrefixTimeout, 3 * 1000);
+		setInterval(catchupBatchedArticles, 10 * 1000);
+
+		if (!this.getActiveFeedId()) {
+			this.viewfeed({feed: -3});
+		} else {
+			this.viewfeed({feed: this.getActiveFeedId(), is_cat: this.activeFeedIsCat()});
+		}
+
+		this.hideOrShowFeeds(getInitParam("hide_read_feeds") == 1);
+
+		if (getInitParam("is_default_pw")) {
+			console.warn("user password is at default value");
+
+			const dialog = new dijit.Dialog({
+				title: __("Your password is at default value"),
+				href: "backend.php?op=dlg&method=defaultpasswordwarning",
+				id: 'infoBox',
+				style: "width: 600px",
+				onCancel: function () {
+					return true;
+				},
+				onExecute: function () {
+					return true;
+				},
+				onClose: function () {
+					return true;
+				}
+			});
+
+			dialog.show();
+		}
+
+		// bw_limit disables timeout() so we request initial counters separately
+		if (getInitParam("bw_limit") == "1") {
+			this.requestCounters(true);
+		} else {
+			setTimeout(() => {
+				this.requestCounters(true);
+
+				setInterval(() => {
+					this.requestCounters();
+				}, 60 * 1000)
+			}, 250);
+		}
+	},
+	activeFeedIsCat: function() {
+		return !!this._active_feed_is_cat;
+	},
+	getActiveFeedId: function() {
+		return this._active_feed_id;
+	},
+	setActiveFeedId: function(id, is_cat) {
+		hash_set('f', id);
+		hash_set('c', is_cat ? 1 : 0);
+
+		this._active_feed_id = id;
+		this._active_feed_is_cat = is_cat;
+
+		$("headlines-frame").setAttribute("feed-id", id);
+		$("headlines-frame").setAttribute("is-cat", is_cat ? 1 : 0);
+
+		this.selectFeed(id, is_cat);
+
+		PluginHost.run(PluginHost.HOOK_FEED_SET_ACTIVE, _active_article_id);
+	},
+	selectFeed: function(feed, is_cat) {
+		const tree = dijit.byId("feedTree");
+
+		if (tree) return tree.selectFeed(feed, is_cat);
+	},
+	toggleDispRead: function() {
+		const hide = !(getInitParam("hide_read_feeds") == "1");
+
+		xhrPost("backend.php", {op: "rpc", method: "setpref", key: "HIDE_READ_FEEDS", value: hide}, () => {
+			this.hideOrShowFeeds(hide);
+			setInitParam("hide_read_feeds", hide);
 		});
-	}, delayed ? 250 : 0);
-}
+	},
+	hideOrShowFeeds: function(hide) {
+		const tree = dijit.byId("feedTree");
 
-function feedlist_init() {
-	console.log("in feedlist init");
+		if (tree)
+			return tree.hideRead(hide, getInitParam("hide_read_shows_special"));
+	},
+	viewfeed: function(params) {
+		const feed = params.feed;
+		const is_cat = !!params.is_cat || false;
+		const offset = params.offset || 0;
+		const viewfeed_debug = params.viewfeed_debug;
+		const method = params.method;
+		// this is used to quickly switch between feeds, sets active but xhr is on a timeout
+		const delayed = params.delayed || false;
 
-	setLoadingProgress(50);
+		if (feed != Feeds.getActiveFeedId() || Feeds.activeFeedIsCat() != is_cat) {
+			this._search_query = false;
+			setActiveArticleId(0);
+		}
 
-	document.onkeydown = hotkey_handler;
-	setInterval(hotkeyPrefixTimeout, 3*1000);
-	setInterval(catchupBatchedArticles, 10*1000);
+		if (offset != 0) {
+			if (this.infscroll_in_progress)
+				return;
 
-	if (!getActiveFeedId()) {
-		viewfeed({feed: -3});
-	} else {
-		viewfeed({feed: getActiveFeedId(), is_cat: activeFeedIsCat()});
-	}
+			this.infscroll_in_progress = 1;
 
-	hideOrShowFeeds(getInitParam("hide_read_feeds") == 1);
+			window.clearTimeout(this._infscroll_timeout);
+			this._infscroll_timeout = window.setTimeout(() => {
+				console.log('infscroll request timed out, aborting');
+				this.infscroll_in_progress = 0;
 
-	if (getInitParam("is_default_pw")) {
-		console.warn("user password is at default value");
+				// call scroll handler to maybe repeat infscroll request
+				Headlines.scrollHandler();
+			}, 10 * 1000);
+		}
 
-		const dialog = new dijit.Dialog({
-			title: __("Your password is at default value"),
-			href: "backend.php?op=dlg&method=defaultpasswordwarning",
-			id: 'infoBox',
-			style: "width: 600px",
-			onCancel: function() {
-				return true;
-			},
-			onExecute: function() {
-				return true;
-			},
-			onClose: function() {
-				return true;
+		Form.enable("main_toolbar_form");
+
+		let query = Object.assign({op: "feeds", method: "view", feed: feed},
+			dojo.formToObject("main_toolbar_form"));
+
+		if (method) query.m = method;
+
+		if (offset > 0) {
+			if (current_first_id) {
+				query.fid = current_first_id;
 			}
-		});
-
-		dialog.show();
-	}
-
-	// bw_limit disables timeout() so we request initial counters separately
-	if (getInitParam("bw_limit") == "1") {
-		request_counters(true);
-	} else {
-		setTimeout(timeout, 250);
-	}
-}
-
-
-function request_counters(force) {
-	const date = new Date();
-	const timestamp = Math.round(date.getTime() / 1000);
-
-	if (force || timestamp - counters_last_request > 5) {
-		console.log("scheduling request of counters...");
-
-		counters_last_request = timestamp;
-
-		let query = {op: "rpc", method: "getAllCounters", seq: next_seq()};
-
-		if (!force)
-			query.last_article_id = getInitParam("last_article_id");
-
-		xhrPost("backend.php", query, (transport) => {
-			handle_rpc_json(transport);
-		});
-
-	} else {
-		console.log("request_counters: rate limit reached: " + (timestamp - counters_last_request));
-	}
-}
-
-// NOTE: this implementation is incomplete
-// for general objects but good enough for counters
-// http://adripofjavascript.com/blog/drips/object-equality-in-javascript.html
-function counter_is_equal(a, b) {
-	// Create arrays of property names
-	const aProps = Object.getOwnPropertyNames(a);
-	const bProps = Object.getOwnPropertyNames(b);
-
-	// If number of properties is different,
-	// objects are not equivalent
-	if (aProps.length != bProps.length) {
-		return false;
-	}
-
-	for (let i = 0; i < aProps.length; i++) {
-		const propName = aProps[i];
-
-		// If values of same property are not equal,
-		// objects are not equivalent
-		if (a[propName] !== b[propName]) {
-			return false;
-		}
-	}
-
-	// If we made it this far, objects
-	// are considered equivalent
-	return true;
-}
-
-
-function parse_counters(elems) {
-	for (let l = 0; l < elems.length; l++) {
-
-		if (_counters_prev[l] && counter_is_equal(elems[l], _counters_prev[l])) {
-			continue;
 		}
 
-		const id = elems[l].id;
-		const kind = elems[l].kind;
-		const ctr = parseInt(elems[l].counter);
-		const error = elems[l].error;
-		const has_img = elems[l].has_img;
-		const updated = elems[l].updated;
-		const auxctr = parseInt(elems[l].auxcounter);
-
-		if (id == "global-unread") {
-			global_unread = ctr;
-			updateTitle();
-			continue;
+		if (this._search_query) {
+			query = Object.assign(query, this._search_query);
 		}
 
-		if (id == "subscribed-feeds") {
-			/* feeds_found = ctr; */
-			continue;
+		if (offset != 0) {
+			query.skip = offset;
+
+			// to prevent duplicate feed titles when showing grouped vfeeds
+			if (vgroup_last_feed) {
+				query.vgrlf = vgroup_last_feed;
+			}
+		} else if (!is_cat && feed == Feeds.getActiveFeedId() && !params.method) {
+			query.m = "ForceUpdate";
 		}
 
-		/*if (getFeedUnread(id, (kind == "cat")) != ctr ||
-				(kind == "cat")) {
-		}*/
+		Form.enable("main_toolbar_form");
 
-		setFeedUnread(id, (kind == "cat"), ctr);
-		setFeedValue(id, (kind == "cat"), 'auxcounter', auxctr);
+		if (!delayed)
+			if (!setFeedExpandoIcon(feed, is_cat,
+				(is_cat) ? 'images/indicator_tiny.gif' : 'images/indicator_white.gif'))
+				notify_progress("Loading, please wait...", true);
 
-		if (kind != "cat") {
-			setFeedValue(id, false, 'error', error);
-			setFeedValue(id, false, 'updated', updated);
+		query.cat = is_cat;
 
-			if (id > 0) {
-				if (has_img) {
-					setFeedIcon(id, false,
-						getInitParam("icons_url") + "/" + id + ".ico?" + has_img);
-				} else {
-					setFeedIcon(id, false, 'images/blank_icon.gif');
+		Feeds.setActiveFeedId(feed, is_cat);
+
+		if (viewfeed_debug) {
+			window.open("backend.php?" +
+				dojo.objectToQuery(
+					Object.assign({debug: 1, csrf_token: getInitParam("csrf_token")}, query)
+				));
+		}
+
+		window.clearTimeout(this._viewfeed_wait_timeout);
+		this._viewfeed_wait_timeout = window.setTimeout(() => {
+			catchupBatchedArticles(() => {
+				xhrPost("backend.php", query, (transport) => {
+					try {
+						setFeedExpandoIcon(feed, is_cat, 'images/blank_icon.gif');
+						Headlines.onLoaded(transport, offset);
+						PluginHost.run(PluginHost.HOOK_FEED_LOADED, [feed, is_cat]);
+					} catch (e) {
+						exception_error(e);
+					}
+				});
+			});
+		}, delayed ? 250 : 0);
+	},
+	catchupAllFeeds: function() {
+		const str = __("Mark all articles as read?");
+
+		if (getInitParam("confirm_feed_catchup") != 1 || confirm(str)) {
+
+			notify_progress("Marking all feeds as read...");
+
+			xhrPost("backend.php", {op: "feeds", method: "catchupAll"}, () => {
+				this.requestCounters(true);
+				this.viewCurrentFeed();
+			});
+
+			App.global_unread = 0;
+			App.updateTitle();
+		}
+	},
+	decrementFeedCounter: function(feed, is_cat) {
+		let ctr = getFeedUnread(feed, is_cat);
+
+		if (ctr > 0) {
+			setFeedUnread(feed, is_cat, ctr - 1);
+			App.global_unread -= 1;
+			App.updateTitle();
+
+			if (!is_cat) {
+				const cat = parseInt(getFeedCategory(feed));
+
+				if (!isNaN(cat)) {
+					ctr = getFeedUnread(cat, true);
+
+					if (ctr > 0) {
+						setFeedUnread(cat, true, ctr - 1);
+					}
 				}
 			}
 		}
 	}
-
-	hideOrShowFeeds(getInitParam("hide_read_feeds") == 1);
-
-	_counters_prev = elems;
-}
+};
 
 function getFeedUnread(feed, is_cat) {
 	try {
@@ -326,13 +454,6 @@ function getFeedCategory(feed) {
 	return false;
 }
 
-function hideOrShowFeeds(hide) {
-	const tree = dijit.byId("feedTree");
-
-	if (tree)
-		return tree.hideRead(hide, getInitParam("hide_read_shows_special"));
-}
-
 function getFeedName(feed, is_cat) {
 
 	if (isNaN(feed)) return feed; // it's a tag
@@ -375,12 +496,6 @@ function setFeedValue(feed, is_cat, key, value) {
 	}
 }
 
-function selectFeed(feed, is_cat) {
-	const tree = dijit.byId("feedTree");
-
-	if (tree) return tree.selectFeed(feed, is_cat);
-}
-
 function setFeedIcon(feed, is_cat, src) {
 	const tree = dijit.byId("feedTree");
 
@@ -404,7 +519,7 @@ function getNextUnreadFeed(feed, is_cat) {
 }
 
 function catchupCurrentFeed(mode) {
-	catchupFeed(getActiveFeedId(), activeFeedIsCat(), mode);
+	catchupFeed(Feeds.getActiveFeedId(), Feeds.activeFeedIsCat(), mode);
 }
 
 function catchupFeedInGroup(id) {
@@ -440,13 +555,13 @@ function catchupFeedInGroup(id) {
 				}
 			}
 
-			updateFloatingTitle(true);
+			Headlines.updateFloatingTitle(true);
 		}
 
 		notify_progress("Loading, please wait...", true);
 
 		xhrPost("backend.php", { op: "rpc", method: "catchupFeed", feed_id: id, is_cat: false}, (transport) => {
-			handle_rpc_json(transport);
+			App.handleRpcJson(transport);
 		});
 	}
 }
@@ -487,7 +602,7 @@ function catchupFeed(feed, is_cat, mode) {
 	notify_progress("Loading, please wait...", true);
 
 	xhrPost("backend.php", catchup_query, (transport) => {
-		handle_rpc_json(transport);
+		App.handleRpcJson(transport);
 
 		const show_next_feed = getInitParam("on_catchup_show_next_feed") == "1";
 
@@ -495,37 +610,15 @@ function catchupFeed(feed, is_cat, mode) {
 			const nuf = getNextUnreadFeed(feed, is_cat);
 
 			if (nuf) {
-				viewfeed({feed: nuf, is_cat: is_cat});
+				Feeds.viewfeed({feed: nuf, is_cat: is_cat});
 			}
-		} else if (feed == getActiveFeedId() && is_cat == activeFeedIsCat()) {
-			viewCurrentFeed();
+		} else if (feed == Feeds.getActiveFeedId() && is_cat == Feeds.activeFeedIsCat()) {
+			Feeds.viewCurrentFeed();
 		}
 
 		notify("");
 	});
 }
 
-function decrementFeedCounter(feed, is_cat) {
-	let ctr = getFeedUnread(feed, is_cat);
-
-	if (ctr > 0) {
-		setFeedUnread(feed, is_cat, ctr - 1);
-		global_unread = global_unread - 1;
-		updateTitle();
-
-		if (!is_cat) {
-			const cat = parseInt(getFeedCategory(feed));
-
-			if (!isNaN(cat)) {
-				ctr = getFeedUnread(cat, true);
-
-				if (ctr > 0) {
-					setFeedUnread(cat, true, ctr - 1);
-				}
-			}
-		}
-	}
-
-}
 
 
diff --git a/js/functions.js b/js/functions.js
index 4a9785fac..d9778ad22 100755
--- a/js/functions.js
+++ b/js/functions.js
@@ -50,13 +50,85 @@ function xhrJson(url, params, complete) {
 }
 
 /* add method to remove element from array */
-
 Array.prototype.remove = function(s) {
 	for (let i=0; i < this.length; i++) {
 		if (s == this[i]) this.splice(i, 1);
 	}
 };
 
+const Utils = {
+	cleanupMemory: function(root) {
+		const dijits = dojo.query("[widgetid]", dijit.byId(root).domNode).map(dijit.byNode);
+
+		dijits.each(function (d) {
+			dojo.destroy(d.domNode);
+		});
+
+		$$("#" + root + " *").each(function (i) {
+			i.parentNode ? i.parentNode.removeChild(i) : true;
+		});
+	},
+	helpDialog: function(topic) {
+		const query = "backend.php?op=backend&method=help&topic=" + param_escape(topic);
+
+		if (dijit.byId("helpDlg"))
+			dijit.byId("helpDlg").destroyRecursive();
+
+		const dialog = new dijit.Dialog({
+			id: "helpDlg",
+			title: __("Help"),
+			style: "width: 600px",
+			href: query,
+		});
+
+		dialog.show();
+	},
+	displayDlg: function(title, id, param, callback) {
+		notify_progress("Loading, please wait...", true);
+
+		const query = {op: "dlg", method: id, param: param};
+
+		xhrPost("backend.php", query, (transport) => {
+			try {
+				const content = transport.responseText;
+
+				let dialog = dijit.byId("infoBox");
+
+				if (!dialog) {
+					dialog = new dijit.Dialog({
+						title: title,
+						id: 'infoBox',
+						style: "width: 600px",
+						onCancel: function () {
+							return true;
+						},
+						onExecute: function () {
+							return true;
+						},
+						onClose: function () {
+							return true;
+						},
+						content: content
+					});
+				} else {
+					dialog.attr('title', title);
+					dialog.attr('content', content);
+				}
+
+				dialog.show();
+
+				notify("");
+
+				if (callback) callback(transport);
+			} catch (e) {
+				exception_error(e);
+			}
+		});
+
+		return false;
+	},
+};
+
 function report_error(message, filename, lineno, colno, error) {
 	exception_error(error, null, filename, lineno);
 }
@@ -324,51 +396,6 @@ function closeInfoBox() {
 	return false;
 }
 
-function displayDlg(title, id, param, callback) {
-	notify_progress("Loading, please wait...", true);
-
-	const query = { op: "dlg", method: id, param: param };
-
-	xhrPost("backend.php", query, (transport) => {
-		try {
-			const content = transport.responseText;
-
-			let dialog = dijit.byId("infoBox");
-
-			if (!dialog) {
-				dialog = new dijit.Dialog({
-					title: title,
-					id: 'infoBox',
-					style: "width: 600px",
-					onCancel: function () {
-						return true;
-					},
-					onExecute: function () {
-						return true;
-					},
-					onClose: function () {
-						return true;
-					},
-					content: content
-				});
-			} else {
-				dialog.attr('title', title);
-				dialog.attr('content', content);
-			}
-
-			dialog.show();
-
-			notify("");
-
-			if (callback) callback(transport);
-		} catch (e) {
-			exception_error(e);
-		}
-	});
-
-	return false;
-}
-
 function getInitParam(key) {
 	return init_params[key];
 }
@@ -453,7 +480,7 @@ function filterDlgCheckAction(sender) {
 
 
 function explainError(code) {
-	return displayDlg(__("Error explained"), "explainError", code);
+	return Utils.displayDlg(__("Error explained"), "explainError", code);
 }
 
 function setLoadingProgress(p) {
@@ -489,9 +516,9 @@ function uploadIconHandler(rc) {
 		case 0:
 			notify_info("Upload complete.");
 			if (inPreferences()) {
-				updateFeedList();
+				Feeds.reload();
 			} else {
-				setTimeout('updateFeedList(false, false)', 50);
+				setTimeout('Feeds.reload(false, false)', 50);
 			}
 			break;
 		case 1:
@@ -514,9 +541,9 @@ function removeFeedIcon(id) {
 		xhrPost("backend.php", query, (transport) => {
 			notify_info("Feed icon removed.");
 			if (inPreferences()) {
-				updateFeedList();
+				Feeds.reload();
 			} else {
-				setTimeout('updateFeedList(false, false)', 50);
+				setTimeout('Feeds.reload(false, false)', 50);
 			}
 		});
 	}
@@ -556,7 +583,7 @@ function addLabel(select, callback) {
 			} else if (inPreferences()) {
 				updateLabelList();
 			} else {
-				updateFeedList();
+				Feeds.reload();
 			}
 		});
 	}
@@ -616,7 +643,7 @@ function quickAddFeed() {
 								dialog.hide();
 								notify_info(__("Subscribed to %s").replace("%s", feed_url));
 
-								updateFeedList();
+								Feeds.reload();
 								break;
 							case 2:
 								dialog.show_error(__("Specified URL seems to be invalid."));
@@ -889,7 +916,7 @@ function quickAddFilter() {
 
 	if (!inPreferences()) {
 		query = { op: "pref-filters", method: "newfilter",
-			feed: getActiveFeedId(), is_cat: activeFeedIsCat() };
+			feed: Feeds.getActiveFeedId(), is_cat: Feeds.activeFeedIsCat() };
 	} else {
 		query = { op: "pref-filters", method: "newfilter" };
 	}
@@ -973,8 +1000,8 @@ function quickAddFilter() {
 
 			if (selectedText != "") {
 
-				const feed_id = activeFeedIsCat() ? 'CAT:' + parseInt(getActiveFeedId()) :
-					getActiveFeedId();
+				const feed_id = Feeds.activeFeedIsCat() ? 'CAT:' + parseInt(Feeds.getActiveFeedId()) :
+					Feeds.getActiveFeedId();
 
 				const rule = { reg_exp: selectedText, feed_id: [feed_id], filter_type: 1 };
 
@@ -991,12 +1018,12 @@ function quickAddFilter() {
 
 					if (reply && reply.title) title = reply.title;
 
-					if (title || getActiveFeedId() || activeFeedIsCat()) {
+					if (title || Feeds.getActiveFeedId() || Feeds.activeFeedIsCat()) {
 
-						console.log(title + " " + getActiveFeedId());
+						console.log(title + " " + Feeds.getActiveFeedId());
 
-						const feed_id = activeFeedIsCat() ? 'CAT:' + parseInt(getActiveFeedId()) :
-							getActiveFeedId();
+						const feed_id = Feeds.activeFeedIsCat() ? 'CAT:' + parseInt(Feeds.getActiveFeedId()) :
+							Feeds.getActiveFeedId();
 
 						const rule = { reg_exp: title, feed_id: [feed_id], filter_type: 1 };
 
@@ -1024,12 +1051,13 @@ function unsubscribeFeed(feed_id, title) {
 			if (dijit.byId("feedEditDlg")) dijit.byId("feedEditDlg").hide();
 
 			if (inPreferences()) {
-				updateFeedList();
+				Feeds.reload();
 			} else {
-				if (feed_id == getActiveFeedId())
-					setTimeout(function() { viewfeed({feed:-5}) }, 100);
+				if (feed_id == Feeds.getActiveFeedId())
+					setTimeout(() => { Feeds.viewfeed({feed:-5}) },
+						100);
 
-				if (feed_id < 0) updateFeedList();
+				if (feed_id < 0) Feeds.reload();
 			}
 		});
 	}
@@ -1219,7 +1247,7 @@ function editFeed(feed) {
 				xhrPost("backend.php", dialog.attr('value'), () => {
 					dialog.hide();
 					notify('');
-					updateFeedList();
+					Feeds.reload();
 				});
 			}
 		},
@@ -1290,7 +1318,7 @@ function feedBrowser() {
 
 				xhrPost("backend.php", query, () => {
 					notify('');
-					updateFeedList();
+					Feeds.reload();
 				});
 
 			} else {
@@ -1375,7 +1403,7 @@ function showFeedsWithErrors() {
 					xhrPost("backend.php",	query, () => {
 						notify('');
 						dialog.hide();
-						updateFeedList();
+						Feeds.reload();
 					});
 				}
 
@@ -1399,22 +1427,6 @@ function get_timestamp() {
 	return Math.round(date.getTime() / 1000);
 }
 
-function helpDialog(topic) {
-	const query = "backend.php?op=backend&method=help&topic=" + param_escape(topic);
-
-	if (dijit.byId("helpDlg"))
-		dijit.byId("helpDlg").destroyRecursive();
-
-	const dialog = new dijit.Dialog({
-		id: "helpDlg",
-		title: __("Help"),
-		style: "width: 600px",
-		href: query,
-	});
-
-	dialog.show();
-}
-
 // noinspection JSUnusedGlobalSymbols
 function label_to_feed_id(label) {
 	return _label_base_index - 1 - Math.abs(label);
diff --git a/js/prefs.js b/js/prefs.js
index 50283efbf..bb547c113 100755
--- a/js/prefs.js
+++ b/js/prefs.js
@@ -6,7 +6,7 @@ function notify_callback2(transport, sticky) {
 	notify_info(transport.responseText, sticky);
 }
 
-function updateFeedList() {
+function Feeds.reload() {
 
 	const user_search = $("feed_search");
 	let search = "";
@@ -324,7 +324,7 @@ function removeSelectedFeeds() {
 				ids: sel_rows.toString() };
 
 			xhrPost("backend.php", query, () => {
-				updateFeedList();
+				Feeds.reload();
 			});
 		}
 
@@ -524,7 +524,7 @@ function editSelectedFeeds() {
 
 					xhrPost("backend.php", query, () => {
 						dialog.hide();
-						updateFeedList();
+						Feeds.reload();
 					});
 				}
 			},
@@ -618,7 +618,7 @@ function selectTab(id, noupdate) {
 
 		switch (id) {
 			case "feedConfig":
-				updateFeedList();
+				Feeds.reload();
 				break;
 			case "filterConfig":
 				updateFilterList();
@@ -764,7 +764,7 @@ function pref_hotkey_handler(e) {
 				quickAddFilter();
 				return false;
 			case "help_dialog":
-				helpDialog("main");
+				Utils.helpDialog("main");
 				return false;
 			default:
 				console.log("unhandled action: " + action_name + "; keycode: " + e.which);
@@ -782,7 +782,7 @@ function removeCategory(id, item) {
 
 		xhrPost("backend.php", query, () => {
 			notify('');
-			updateFeedList();
+			Feeds.reload();
 		});
 	}
 }
@@ -798,7 +798,7 @@ function removeSelectedCategories() {
 				ids: sel_rows.toString() };
 
 			xhrPost("backend.php", query, () => {
-				updateFeedList();
+				Feeds.reload();
 			});
 		}
 	} else {
@@ -816,7 +816,7 @@ function createCategory() {
 
 		xhrPost("backend.php", { op: "pref-feeds", method: "addCat", cat: title }, () => {
 			notify('');
-			updateFeedList();
+			Feeds.reload();
 		});
 	}
 }
@@ -847,7 +847,7 @@ function showInactiveFeeds() {
 					xhrPost("backend.php", query, () => {
 						notify('');
 						dialog.hide();
-						updateFeedList();
+						Feeds.reload();
 					});
 				}
 
@@ -1037,7 +1037,7 @@ function resetFeedOrder() {
 	notify_progress("Loading, please wait...");
 
 	xhrPost("backend.php", { op: "pref-feeds", method: "feedsortreset" }, () => {
-		updateFeedList();
+		Feeds.reload();
 	});
 }
 
@@ -1045,7 +1045,7 @@ function resetCatOrder() {
 	notify_progress("Loading, please wait...");
 
 	xhrPost("backend.php", { op: "pref-feeds", method: "catsortreset" }, () => {
-		updateFeedList();
+		Feeds.reload();
 	});
 }
 
@@ -1057,7 +1057,7 @@ function editCat(id, item) {
 		notify_progress("Loading, please wait...");
 
 		xhrPost("backend.php", { op: 'pref-feeds', method: 'renamecat', id: id, title: new_name }, () => {
-			updateFeedList();
+			Feeds.reload();
 		});
 	}
 }
@@ -1176,7 +1176,7 @@ function batchSubscribe() {
 
 				xhrPost("backend.php", this.attr('value'), () => {
 					notify("");
-					updateFeedList();
+					Feeds.reload();
 					dialog.hide();
 				});
 			}
diff --git a/js/tt-rss.js b/js/tt-rss.js
index 99a484e9a..b5b785321 100644
--- a/js/tt-rss.js
+++ b/js/tt-rss.js
@@ -1,148 +1,215 @@
 /* global dijit, __ */
 
-let global_unread = -1;
 let _widescreen_mode = false;
-let _rpc_seq = 0;
-let _active_feed_id = 0;
-let _active_feed_is_cat = false;
 let hotkey_actions = {};
-let _headlines_scroll_timeout = false;
 
-function next_seq() {
-	_rpc_seq += 1;
-	return _rpc_seq;
-}
+const App = {
+	_rpc_seq: 0,
+	global_unread: -1,
+	next_seq: function() {
+		this._rpc_seq += 1;
+		return this._rpc_seq;
+	},
+	get_seq: function() {
+		return this._rpc_seq;
+	},
+	updateTitle: function() {
+		let tmp = "Tiny Tiny RSS";
 
-function get_seq() {
-	return _rpc_seq;
-}
-
-function activeFeedIsCat() {
-	return !!_active_feed_is_cat;
-}
-
-function getActiveFeedId() {
-	return _active_feed_id;
-}
-
-function setActiveFeedId(id, is_cat) {
-	hash_set('f', id);
-	hash_set('c', is_cat ? 1 : 0);
-
-	_active_feed_id = id;
-	_active_feed_is_cat = is_cat;
-
-	$("headlines-frame").setAttribute("feed-id", id);
-	$("headlines-frame").setAttribute("is-cat", is_cat ? 1 : 0);
-
-	selectFeed(id, is_cat);
-
-	PluginHost.run(PluginHost.HOOK_FEED_SET_ACTIVE, _active_article_id);
-}
-
-
-function updateFeedList() {
-	try {
-		Element.show("feedlistLoading");
-
-		resetCounterCache();
-
-		if (dijit.byId("feedTree")) {
-			dijit.byId("feedTree").destroyRecursive();
+		if (this.global_unread > 0) {
+			tmp = "(" + this.global_unread + ") " + tmp;
 		}
 
-		const store = new dojo.data.ItemFileWriteStore({
-			url: "backend.php?op=pref_feeds&method=getfeedtree&mode=2"
-		});
+		document.title = tmp;
+	},
+	isCombinedMode: function() {
+		return getInitParam("combined_display_mode");
+	},
+	hotkeyHandler(event) {
+		if (event.target.nodeName == "INPUT" || event.target.nodeName == "TEXTAREA") return;
 
-		const treeModel = new fox.FeedStoreModel({
-			store: store,
-			query: {
-				"type": getInitParam('enable_feed_cats') == 1 ? "category" : "feed"
-			},
-			rootId: "root",
-			rootLabel: "Feeds",
-			childrenAttrs: ["items"]
-		});
+		const action_name = keyeventToAction(event);
 
-		const tree = new fox.FeedTree({
-			model: treeModel,
-			onClick: function (item, node) {
-				const id = String(item.id);
-				const is_cat = id.match("^CAT:");
-				const feed = id.substr(id.indexOf(":") + 1);
-				viewfeed({feed: feed, is_cat: is_cat});
+		if (action_name) {
+			const action_func = hotkey_actions[action_name];
+
+			if (action_func != null) {
+				action_func();
+				event.stopPropagation();
 				return false;
-			},
-			openOnClick: false,
-			showRoot: false,
-			persist: true,
-			id: "feedTree",
-		}, "feedTree");
-
-		var tmph = dojo.connect(dijit.byId('feedMenu'), '_openMyself', function (event) {
-			console.log(dijit.getEnclosingWidget(event.target));
-			dojo.disconnect(tmph);
-		});
-
-		$("feeds-holder").appendChild(tree.domNode);
-
-		var tmph = dojo.connect(tree, 'onLoad', function () {
-			dojo.disconnect(tmph);
-			Element.hide("feedlistLoading");
-
-			try {
-				feedlist_init();
-
-				setLoadingProgress(25);
-			} catch (e) {
-				exception_error(e);
 			}
-		});
+		}
+	},
+	switchPanelMode: function(wide) {
+		if (App.isCombinedMode()) return;
 
-		tree.startup();
-	} catch (e) {
-		exception_error(e);
-	}
-}
+		const article_id = getActiveArticleId();
 
-function catchupAllFeeds() {
+		if (wide) {
+			dijit.byId("headlines-wrap-inner").attr("design", 'sidebar');
+			dijit.byId("content-insert").attr("region", "trailing");
 
-	const str = __("Mark all articles as read?");
+			dijit.byId("content-insert").domNode.setStyle({width: '50%',
+				height: 'auto',
+				borderTopWidth: '0px' });
 
-	if (getInitParam("confirm_feed_catchup") != 1 || confirm(str)) {
+			if (parseInt(getCookie("ttrss_ci_width")) > 0) {
+				dijit.byId("content-insert").domNode.setStyle(
+					{width: getCookie("ttrss_ci_width") + "px" });
+			}
 
-		notify_progress("Marking all feeds as read...");
+			$("headlines-frame").setStyle({ borderBottomWidth: '0px' });
+			$("headlines-frame").addClassName("wide");
 
-		xhrPost("backend.php", {op: "feeds", method: "catchupAll"}, () => {
-			request_counters(true);
-			viewCurrentFeed();
-		});
+		} else {
 
-		global_unread = 0;
-		updateTitle("");
-	}
-}
+			dijit.byId("content-insert").attr("region", "bottom");
 
-function viewCurrentFeed(method) {
-	console.log("viewCurrentFeed: " + method);
+			dijit.byId("content-insert").domNode.setStyle({width: 'auto',
+				height: '50%',
+				borderTopWidth: '0px'});
 
-	if (getActiveFeedId() != undefined) {
-		viewfeed({feed: getActiveFeedId(), is_cat: activeFeedIsCat(), method: method});
-	}
-	return false; // block unneeded form submits
-}
+			if (parseInt(getCookie("ttrss_ci_height")) > 0) {
+				dijit.byId("content-insert").domNode.setStyle(
+					{height: getCookie("ttrss_ci_height") + "px" });
+			}
 
-function timeout() {
-	if (getInitParam("bw_limit") != "1") {
-		request_counters(true);
-		setTimeout(timeout, 60*1000);
-	}
-}
+			$("headlines-frame").setStyle({ borderBottomWidth: '1px' });
+			$("headlines-frame").removeClassName("wide");
+
+		}
+
+		Article.closeArticlePanel();
+
+		if (article_id) view(article_id);
+
+		xhrPost("backend.php", {op: "rpc", method: "setpanelmode", wide: wide ? 1 : 0});
+	},
+	parseRuntimeInfo: function(data) {
+
+		//console.log("parsing runtime info...");
+
+		for (const k in data) {
+			const v = data[k];
+
+			if (k == "dep_ts" && parseInt(getInitParam("dep_ts")) > 0) {
+				if (parseInt(getInitParam("dep_ts")) < parseInt(v) && getInitParam("reload_on_ts_change")) {
+					window.location.reload();
+				}
+			}
+
+			if (k == "daemon_is_running" && v != 1) {
+				notify_error("<span onclick=\"explainError(1)\">Update daemon is not running.</span>", true);
+				return;
+			}
+
+			if (k == "update_result") {
+				const updatesIcon = dijit.byId("updatesIcon").domNode;
+
+				if (v) {
+					Element.show(updatesIcon);
+				} else {
+					Element.hide(updatesIcon);
+				}
+			}
+
+			if (k == "daemon_stamp_ok" && v != 1) {
+				notify_error("<span onclick=\"explainError(3)\">Update daemon is not updating feeds.</span>", true);
+				return;
+			}
+
+			if (k == "max_feed_id" || k == "num_feeds") {
+				if (init_params[k] != v) {
+					console.log("feed count changed, need to reload feedlist.");
+					Feeds.reload();
+				}
+			}
+
+			init_params[k] = v;
+			notify('');
+		}
+
+		PluginHost.run(PluginHost.HOOK_RUNTIME_INFO_LOADED, data);
+	},
+	handleRpcJson: function(transport) {
+
+		const netalert_dijit = dijit.byId("net-alert");
+		let netalert = false;
+
+		if (netalert_dijit) netalert = netalert_dijit.domNode;
+
+		try {
+			const reply = JSON.parse(transport.responseText);
+
+			if (reply) {
+
+				const error = reply['error'];
+
+				if (error) {
+					const code = error['code'];
+					const msg = error['msg'];
+
+					console.warn("[handleRpcJson] received fatal error " + code + "/" + msg);
+
+					if (code != 0) {
+						fatalError(code, msg);
+						return false;
+					}
+				}
+
+				const seq = reply['seq'];
+
+				if (seq && this.get_seq() != seq) {
+					console.log("[handleRpcJson] sequence mismatch: " + seq +
+						" (want: " + this.get_seq() + ")");
+					return true;
+				}
+
+				const message = reply['message'];
+
+				if (message == "UPDATE_COUNTERS") {
+					console.log("need to refresh counters...");
+					setInitParam("last_article_id", -1);
+					Feeds.requestCounters(true);
+				}
+
+				const counters = reply['counters'];
+
+				if (counters)
+					Feeds.parseCounters(counters);
+
+				const runtime_info = reply['runtime-info'];
+
+				if (runtime_info)
+					this.parseRuntimeInfo(runtime_info);
+
+				if (netalert) netalert.hide();
+
+				return reply;
+
+			} else {
+				if (netalert)
+					netalert.show();
+				else
+					notify_error("Communication problem with server.");
+			}
+
+		} catch (e) {
+			if (netalert)
+				netalert.show();
+			else
+				notify_error("Communication problem with server.");
+
+			console.error(e);
+		}
+
+		return false;
+	},
+};
 
 function search() {
 	const query = "backend.php?op=feeds&method=search&param=" +
-		param_escape(getActiveFeedId() + ":" + activeFeedIsCat());
+		param_escape(Feeds.getActiveFeedId() + ":" + Feeds.activeFeedIsCat());
 
 	if (dijit.byId("searchDlg"))
 		dijit.byId("searchDlg").destroyRecursive();
@@ -153,9 +220,9 @@ function search() {
 		style: "width: 600px",
 		execute: function() {
 			if (this.validate()) {
-				_search_query = this.attr('value');
+				Feeds._search_query = this.attr('value');
 				this.hide();
-				viewCurrentFeed();
+				Feeds.viewCurrentFeed();
 			}
 		},
 		href: query});
@@ -163,16 +230,6 @@ function search() {
 	dialog.show();
 }
 
-function updateTitle() {
-	let tmp = "Tiny Tiny RSS";
-
-	if (global_unread > 0) {
-		tmp = "(" + global_unread + ") " + tmp;
-	}
-
-	document.title = tmp;
-}
-
 function genericSanityCheck() {
 	setCookie("ttrss_test", "TEST");
 
@@ -272,15 +329,15 @@ function init() {
 function init_hotkey_actions() {
 	hotkey_actions["next_feed"] = function() {
 		const rv = dijit.byId("feedTree").getNextFeed(
-			getActiveFeedId(), activeFeedIsCat());
+			Feeds.getActiveFeedId(), Feeds.activeFeedIsCat());
 
-		if (rv) viewfeed({feed: rv[0], is_cat: rv[1], delayed: true})
+		if (rv) Feeds.viewfeed({feed: rv[0], is_cat: rv[1], delayed: true})
 	};
 	hotkey_actions["prev_feed"] = function() {
 		const rv = dijit.byId("feedTree").getPreviousFeed(
-			getActiveFeedId(), activeFeedIsCat());
+			Feeds.getActiveFeedId(), Feeds.activeFeedIsCat());
 
-		if (rv) viewfeed({feed: rv[0], is_cat: rv[1], delayed: true})
+		if (rv) Feeds.viewfeed({feed: rv[0], is_cat: rv[1], delayed: true})
 	};
 	hotkey_actions["next_article"] = function() {
 		moveToPost('next');
@@ -320,7 +377,7 @@ function init_hotkey_actions() {
 	}
 	hotkey_actions["open_in_new_window"] = function() {
 		if (getActiveArticleId()) {
-			openArticleInNewWindow(getActiveArticleId());
+			Article.openArticleInNewWindow(getActiveArticleId());
 		}
 	};
 	hotkey_actions["catchup_below"] = function() {
@@ -336,10 +393,10 @@ function init_hotkey_actions() {
 		scrollArticle(-40);
 	};
 	hotkey_actions["close_article"] = function() {
-		if (isCombinedMode()) {
+		if (App.isCombinedMode()) {
 			cdmCollapseActive();
 		} else {
-			closeArticlePanel();
+			Article.closeArticlePanel();
 		}
 	};
 	hotkey_actions["email_article"] = function() {
@@ -370,20 +427,20 @@ function init_hotkey_actions() {
 		selectArticles('none');
 	};
 	hotkey_actions["feed_refresh"] = function() {
-		if (getActiveFeedId() != undefined) {
-			viewfeed({feed: getActiveFeedId(), is_cat: activeFeedIsCat()});
+		if (Feeds.getActiveFeedId() != undefined) {
+			Feeds.viewfeed({feed: Feeds.getActiveFeedId(), is_cat: Feeds.activeFeedIsCat()});
 			return;
 		}
 	};
 	hotkey_actions["feed_unhide_read"] = function() {
-		toggleDispRead();
+		Feeds.toggleDispRead();
 	};
 	hotkey_actions["feed_subscribe"] = function() {
 		quickAddFeed();
 	};
 	hotkey_actions["feed_debug_update"] = function() {
-		if (!activeFeedIsCat() && parseInt(getActiveFeedId()) > 0) {
-			window.open("backend.php?op=feeds&method=update_debugger&feed_id=" + getActiveFeedId() +
+		if (!Feeds.activeFeedIsCat() && parseInt(Feeds.getActiveFeedId()) > 0) {
+			window.open("backend.php?op=feeds&method=update_debugger&feed_id=" + Feeds.getActiveFeedId() +
 				"&csrf_token=" + getInitParam("csrf_token"));
 		} else {
 			alert("You can't debug this kind of feed.");
@@ -391,17 +448,17 @@ function init_hotkey_actions() {
 	};
 
 	hotkey_actions["feed_debug_viewfeed"] = function() {
-		viewfeed({feed: getActiveFeedId(), is_cat: activeFeedIsCat(), viewfeed_debug: true});
+		Feeds.viewfeed({feed: Feeds.getActiveFeedId(), is_cat: Feeds.activeFeedIsCat(), viewfeed_debug: true});
 	};
 
 	hotkey_actions["feed_edit"] = function() {
-		if (activeFeedIsCat())
+		if (Feeds.activeFeedIsCat())
 			alert(__("You can't edit this kind of feed."));
 		else
-			editFeed(getActiveFeedId());
+			editFeed(Feeds.getActiveFeedId());
 	};
 	hotkey_actions["feed_catchup"] = function() {
-		if (getActiveFeedId() != undefined) {
+		if (Feeds.getActiveFeedId() != undefined) {
 			catchupCurrentFeed();
 			return;
 		}
@@ -411,32 +468,32 @@ function init_hotkey_actions() {
 	};
 	hotkey_actions["feed_toggle_vgroup"] = function() {
 		xhrPost("backend.php", {op: "rpc", method: "togglepref", key: "VFEED_GROUP_BY_FEED"}, () => {
-			viewCurrentFeed();
+			Feeds.viewCurrentFeed();
 		})
 	};
 	hotkey_actions["catchup_all"] = function() {
-		catchupAllFeeds();
+		Feeds.catchupAllFeeds();
 	};
 	hotkey_actions["cat_toggle_collapse"] = function() {
-		if (activeFeedIsCat()) {
-			dijit.byId("feedTree").collapseCat(getActiveFeedId());
+		if (Feeds.activeFeedIsCat()) {
+			dijit.byId("feedTree").collapseCat(Feeds.getActiveFeedId());
 			return;
 		}
 	};
 	hotkey_actions["goto_all"] = function() {
-		viewfeed({feed: -4});
+		Feeds.viewfeed({feed: -4});
 	};
 	hotkey_actions["goto_fresh"] = function() {
-		viewfeed({feed: -3});
+		Feeds.viewfeed({feed: -3});
 	};
 	hotkey_actions["goto_marked"] = function() {
-		viewfeed({feed: -1});
+		Feeds.viewfeed({feed: -1});
 	};
 	hotkey_actions["goto_published"] = function() {
-		viewfeed({feed: -2});
+		Feeds.viewfeed({feed: -2});
 	};
 	hotkey_actions["goto_tagcloud"] = function() {
-		displayDlg(__("Tag cloud"), "printTagCloud");
+		Utils.displayDlg(__("Tag cloud"), "printTagCloud");
 	};
 	hotkey_actions["goto_prefs"] = function() {
 		gotoPreferences();
@@ -467,7 +524,7 @@ function init_hotkey_actions() {
 		quickAddFilter();
 	};
 	hotkey_actions["collapse_sidebar"] = function() {
-		collapse_feedlist();
+		Feeds.viewCurrentFeed();
 	};
 	hotkey_actions["toggle_embed_original"] = function() {
 		if (typeof embedOriginalArticle != "undefined") {
@@ -478,32 +535,32 @@ function init_hotkey_actions() {
 		}
 	};
 	hotkey_actions["toggle_widescreen"] = function() {
-		if (!isCombinedMode()) {
+		if (!App.isCombinedMode()) {
 			_widescreen_mode = !_widescreen_mode;
 
 			// reset stored sizes because geometry changed
 			setCookie("ttrss_ci_width", 0);
 			setCookie("ttrss_ci_height", 0);
 
-			switchPanelMode(_widescreen_mode);
+			App.switchPanelMode(_widescreen_mode);
 		} else {
 			alert(__("Widescreen is not available in combined mode."));
 		}
 	};
 	hotkey_actions["help_dialog"] = function() {
-		helpDialog("main");
+		Utils.helpDialog("main");
 	};
 	hotkey_actions["toggle_combined_mode"] = function() {
 		notify_progress("Loading, please wait...");
 
-		const value = isCombinedMode() ? "false" : "true";
+		const value = App.isCombinedMode() ? "false" : "true";
 
 		xhrPost("backend.php", {op: "rpc", method: "setpref", key: "COMBINED_DISPLAY_MODE", value: value}, () => {
 			setInitParam("combined_display_mode",
 				!getInitParam("combined_display_mode"));
 
-			closeArticlePanel();
-			viewCurrentFeed();
+			Article.closeArticlePanel();
+			Feeds.viewCurrentFeed();
 		})
 	};
 	hotkey_actions["toggle_cdm_expanded"] = function() {
@@ -513,15 +570,15 @@ function init_hotkey_actions() {
 
 		xhrPost("backend.php", { op: "rpc", method: "setpref", key: "CDM_EXPANDED", value: value }, () => {
 			setInitParam("cdm_expanded", !getInitParam("cdm_expanded"));
-			viewCurrentFeed();
+			Feeds.viewCurrentFeed();
 		});
 	};
 
 }
 
 function init_second_stage() {
-	updateFeedList();
-	closeArticlePanel();
+	Feeds.reload();
+	Article.closeArticlePanel();
 
 	if (parseInt(getCookie("ttrss_fh_width")) > 0) {
 		dijit.byId("feeds-holder").domNode.setStyle(
@@ -559,7 +616,7 @@ function init_second_stage() {
 	const hash_feed_is_cat = hash_get('c') == "1";
 
 	if (hash_feed_id != undefined) {
-		setActiveFeedId(hash_feed_id, hash_feed_is_cat);
+		Feeds.setActiveFeedId(hash_feed_id, hash_feed_is_cat);
 	}
 
 	setLoadingProgress(50);
@@ -569,15 +626,9 @@ function init_second_stage() {
 		sessionStorage.clear();
 
 	_widescreen_mode = getInitParam("widescreen");
-	switchPanelMode(_widescreen_mode);
+	App.switchPanelMode(_widescreen_mode);
 
-	$("headlines-frame").onscroll = (event) => {
-		clearTimeout(_headlines_scroll_timeout);
-		_headlines_scroll_timeout = window.setTimeout(function() {
-			//console.log('done scrolling', event);
-			headlinesScrollHandler(event);
-		}, 50);
-	}
+	Headlines.initScrollHandler();
 
 	console.log("second stage ok");
 
@@ -596,7 +647,7 @@ function quickMenuGo(opid) {
 		document.location.href = "backend.php?op=logout";
 		break;
 	case "qmcTagCloud":
-		displayDlg(__("Tag cloud"), "printTagCloud");
+		Utils.displayDlg(__("Tag cloud"), "printTagCloud");
 		break;
 	case "qmcSearch":
 		search();
@@ -608,15 +659,15 @@ function quickMenuGo(opid) {
 		window.location.href = "backend.php?op=digest";
 		break;
 	case "qmcEditFeed":
-		if (activeFeedIsCat())
+		if (Feeds.activeFeedIsCat())
 			alert(__("You can't edit this kind of feed."));
 		else
-			editFeed(getActiveFeedId());
+			editFeed(Feeds.getActiveFeedId());
 		break;
 	case "qmcRemoveFeed":
-		var actid = getActiveFeedId();
+		var actid = Feeds.getActiveFeedId();
 
-		if (activeFeedIsCat()) {
+		if (Feeds.activeFeedIsCat()) {
 			alert(__("You can't unsubscribe from the category."));
 			return;
 		}
@@ -635,120 +686,35 @@ function quickMenuGo(opid) {
 		}
 		break;
 	case "qmcCatchupAll":
-		catchupAllFeeds();
+		Feeds.catchupAllFeeds();
 		break;
 	case "qmcShowOnlyUnread":
-		toggleDispRead();
+		Feeds.toggleDispRead();
 		break;
 	case "qmcToggleWidescreen":
-		if (!isCombinedMode()) {
+		if (!App.isCombinedMode()) {
 			_widescreen_mode = !_widescreen_mode;
 
 			// reset stored sizes because geometry changed
 			setCookie("ttrss_ci_width", 0);
 			setCookie("ttrss_ci_height", 0);
 
-			switchPanelMode(_widescreen_mode);
+			App.switchPanelMode(_widescreen_mode);
 		} else {
 			alert(__("Widescreen is not available in combined mode."));
 		}
 		break;
 	case "qmcHKhelp":
-		helpDialog("main");
+		Utils.helpDialog("main");
 		break;
 	default:
 		console.log("quickMenuGo: unknown action: " + opid);
 	}
 }
 
-function toggleDispRead() {
-
-	const hide = !(getInitParam("hide_read_feeds") == "1");
-
-	xhrPost("backend.php", {op: "rpc", method: "setpref", key: "HIDE_READ_FEEDS", value: hide}, () => {
-		hideOrShowFeeds(hide);
-		setInitParam("hide_read_feeds", hide);
-	});
-}
-
-function parse_runtime_info(data) {
-
-	//console.log("parsing runtime info...");
-
-	for (const k in data) {
-		const v = data[k];
-
-//		console.log("RI: " + k + " => " + v);
-
-		if (k == "dep_ts" && parseInt(getInitParam("dep_ts")) > 0) {
-			if (parseInt(getInitParam("dep_ts")) < parseInt(v) && getInitParam("reload_on_ts_change")) {
-				window.location.reload();
-			}
-		}
-
-		if (k == "daemon_is_running" && v != 1) {
-			notify_error("<span onclick=\"explainError(1)\">Update daemon is not running.</span>", true);
-			return;
-		}
-
-		if (k == "update_result") {
-			const updatesIcon = dijit.byId("updatesIcon").domNode;
-
-			if (v) {
-				Element.show(updatesIcon);
-			} else {
-				Element.hide(updatesIcon);
-			}
-		}
-
-		if (k == "daemon_stamp_ok" && v != 1) {
-			notify_error("<span onclick=\"explainError(3)\">Update daemon is not updating feeds.</span>", true);
-			return;
-		}
-
-		if (k == "max_feed_id" || k == "num_feeds") {
-			if (init_params[k] != v) {
-				console.log("feed count changed, need to reload feedlist.");
-				updateFeedList();
-			}
-		}
-
-		init_params[k] = v;
-		notify('');
-	}
-
-	PluginHost.run(PluginHost.HOOK_RUNTIME_INFO_LOADED, data);
-}
-
-function collapse_feedlist() {
-	Element.toggle("feeds-holder");
-
-	const splitter = $("feeds-holder_splitter");
-
-	Element.visible("feeds-holder") ? splitter.show() : splitter.hide();
-
-	dijit.byId("main").resize();
-}
-
 function viewModeChanged() {
 	cache_clear();
-	return viewCurrentFeed('');
-}
-
-function hotkey_handler(e) {
-	if (e.target.nodeName == "INPUT" || e.target.nodeName == "TEXTAREA") return;
-
-	const action_name = keyeventToAction(e);
-
-	if (action_name) {
-		const action_func = hotkey_actions[action_name];
-
-		if (action_func != null) {
-			action_func();
-			e.stopPropagation();
-			return false;
-		}
-	}
+	return Feeds.viewCurrentFeed('');
 }
 
 function inPreferences() {
@@ -769,136 +735,15 @@ function reverseHeadlineOrder() {
 
 	order_by.attr('value', value);
 
-	viewCurrentFeed();
+	Feeds.viewCurrentFeed();
 
 }
 
-function handle_rpc_json(transport, scheduled_call) {
-
-	const netalert_dijit = dijit.byId("net-alert");
-	let netalert = false;
-
-	if (netalert_dijit) netalert = netalert_dijit.domNode;
-
-	try {
-		const reply = JSON.parse(transport.responseText);
-
-		if (reply) {
-
-			const error = reply['error'];
-
-			if (error) {
-				const code = error['code'];
-				const msg = error['msg'];
-
-				console.warn("[handle_rpc_json] received fatal error " + code + "/" + msg);
-
-				if (code != 0) {
-					fatalError(code, msg);
-					return false;
-				}
-			}
-
-			const seq = reply['seq'];
-
-			if (seq && get_seq() != seq) {
-				console.log("[handle_rpc_json] sequence mismatch: " + seq +
-					" (want: " + get_seq() + ")");
-				return true;
-			}
-
-			const message = reply['message'];
-
-			if (message == "UPDATE_COUNTERS") {
-				console.log("need to refresh counters...");
-				setInitParam("last_article_id", -1);
-				request_counters(true);
-			}
-
-			const counters = reply['counters'];
-
-			if (counters)
-				parse_counters(counters, scheduled_call);
-
-			const runtime_info = reply['runtime-info'];
-
-			if (runtime_info)
-				parse_runtime_info(runtime_info);
-
-			if (netalert) netalert.hide();
-
-			return reply;
-
-		} else {
-			if (netalert)
-				netalert.show();
-			else
-				notify_error("Communication problem with server.");
-		}
-
-	} catch (e) {
-		if (netalert)
-			netalert.show();
-		else
-			notify_error("Communication problem with server.");
-
-		console.error(e);
-	}
-
-	return false;
-}
-
-function switchPanelMode(wide) {
-	if (isCombinedMode()) return;
-
-	const article_id = getActiveArticleId();
-
-	if (wide) {
-		dijit.byId("headlines-wrap-inner").attr("design", 'sidebar');
-		dijit.byId("content-insert").attr("region", "trailing");
-
-  		dijit.byId("content-insert").domNode.setStyle({width: '50%',
-			height: 'auto',
-			borderTopWidth: '0px' });
-
-		if (parseInt(getCookie("ttrss_ci_width")) > 0) {
-			dijit.byId("content-insert").domNode.setStyle(
-				{width: getCookie("ttrss_ci_width") + "px" });
-		}
-
-		$("headlines-frame").setStyle({ borderBottomWidth: '0px' });
-		$("headlines-frame").addClassName("wide");
-
-	} else {
-
-		dijit.byId("content-insert").attr("region", "bottom");
-
-  		dijit.byId("content-insert").domNode.setStyle({width: 'auto',
-			height: '50%',
-			borderTopWidth: '0px'});
-
-		if (parseInt(getCookie("ttrss_ci_height")) > 0) {
-			dijit.byId("content-insert").domNode.setStyle(
-				{height: getCookie("ttrss_ci_height") + "px" });
-		}
-
-		$("headlines-frame").setStyle({ borderBottomWidth: '1px' });
-		$("headlines-frame").removeClassName("wide");
-
-	}
-
-	closeArticlePanel();
-
-	if (article_id) view(article_id);
-
-	xhrPost("backend.php", {op: "rpc", method: "setpanelmode", wide: wide ? 1 : 0});
-}
-
 function update_random_feed() {
 	console.log("in update_random_feed");
 
 	xhrPost("backend.php", { op: "rpc", method: "updateRandomFeed" }, (transport) => {
-		handle_rpc_json(transport, true);
+		App.handleRpcJson(transport, true);
 		window.setTimeout(update_random_feed, 30*1000);
 	});
 }
diff --git a/js/viewfeed.js b/js/viewfeed.js
index 87d0fc55d..637aa0473 100755
--- a/js/viewfeed.js
+++ b/js/viewfeed.js
@@ -15,191 +15,401 @@ let last_search_query;
 
 let has_storage = 'sessionStorage' in window && window['sessionStorage'] !== null;
 
-function headlines_callback2(transport, offset) {
-	const reply = handle_rpc_json(transport);
+const Article = {
+	closeArticlePanel: function () {
+		if (dijit.byId("content-insert"))
+			dijit.byId("headlines-wrap-inner").removeChild(
+				dijit.byId("content-insert"));
+	},
+	displayArticleUrl: function (id) {
+		const query = {op: "rpc", method: "getlinktitlebyid", id: id};
 
-	console.log("headlines_callback2, offset=", offset);
+		xhrJson("backend.php", query, (reply) => {
+			if (reply && reply.link) {
+				prompt(__("Article URL:"), reply.link);
+			}
+		});
+	},
+	openArticleInNewWindow: function (id) {
+		const w = window.open("");
+		w.opener = null;
+		w.location = "backend.php?op=article&method=redirect&id=" + id;
+	},
+	renderArticle: function (article) {
+		Utils.cleanupMemory("content-insert");
 
-	let is_cat = false;
-	let feed_id = false;
+		dijit.byId("headlines-wrap-inner").addChild(
+			dijit.byId("content-insert"));
 
-	if (reply) {
-
-		is_cat = reply['headlines']['is_cat'];
-		feed_id = reply['headlines']['id'];
-		last_search_query = reply['headlines']['search_query'];
-
-		if (feed_id != -7 && (feed_id != getActiveFeedId() || is_cat != activeFeedIsCat()))
-			return;
+		const c = dijit.byId("content-insert");
 
 		try {
-			if (offset == 0) {
-				$("headlines-frame").scrollTop = 0;
+			c.domNode.scrollTop = 0;
+		} catch (e) {
+		}
 
-				Element.hide("floatingTitle");
-				$("floatingTitle").setAttribute("data-article-id", 0);
-				$("floatingTitle").innerHTML = "";
+		c.attr('content', article);
+		PluginHost.run(PluginHost.HOOK_ARTICLE_RENDERED, c.domNode);
+
+		correctHeadlinesOffset(getActiveArticleId());
+
+		try {
+			c.focus();
+		} catch (e) {
+		}
+	},
+}
+
+const Headlines = {
+	_headlines_scroll_timeout: 0,
+	initScrollHandler: function() {
+		$("headlines-frame").onscroll = (event) => {
+			clearTimeout(this._headlines_scroll_timeout);
+			this._headlines_scroll_timeout = window.setTimeout(function() {
+				//console.log('done scrolling', event);
+				Headlines.scrollHandler();
+			}, 50);
+		}
+	},
+	loadMoreHeadlines: function() {
+		const view_mode = document.forms["main_toolbar_form"].view_mode.value;
+		const unread_in_buffer = $$("#headlines-frame > div[id*=RROW][class*=Unread]").length;
+		const num_all = $$("#headlines-frame > div[id*=RROW]").length;
+		const num_unread = getFeedUnread(Feeds.getActiveFeedId(), Feeds.activeFeedIsCat());
+
+		// TODO implement marked & published
+
+		let offset = num_all;
+
+		switch (view_mode) {
+			case "marked":
+			case "published":
+				console.warn("loadMoreHeadlines: ", view_mode, "not implemented");
+				break;
+			case "unread":
+				offset = unread_in_buffer;
+				break;
+			case "adaptive":
+				if (!(Feeds.getActiveFeedId() == -1 && !Feeds.activeFeedIsCat()))
+					offset = num_unread > 0 ? unread_in_buffer : num_all;
+				break;
+		}
+
+		console.log("loadMoreHeadlines, offset=", offset);
+
+		Feeds.viewfeed({feed: Feeds.getActiveFeedId(), is_cat: Feeds.activeFeedIsCat(), offset: offset});
+	},
+	scrollHandler: function() {
+		try {
+			Headlines.unpackVisibleArticles();
+
+			if (App.isCombinedMode()) {
+				Headlines.updateFloatingTitle();
+
+				// set topmost child in the buffer as active
+				if (getInitParam("cdm_expanded") && getInitParam("cdm_auto_catchup") == 1) {
+
+					const rows = $$("#headlines-frame > div[id*=RROW]");
+
+					for (let i = 0; i < rows.length; i++) {
+						const row = rows[i];
+
+						if ($("headlines-frame").scrollTop <= row.offsetTop &&
+							row.offsetTop - $("headlines-frame").scrollTop < 100 &&
+							row.getAttribute("data-article-id") != getActiveArticleId()) {
+
+							setActiveArticleId(row.getAttribute("data-article-id"));
+							break;
+						}
+					}
+				}
 			}
-		} catch (e) { }
 
-		$("headlines-frame").removeClassName("cdm");
-		$("headlines-frame").removeClassName("normal");
+			if (!Feeds.infscroll_disabled) {
+				const hsp = $("headlines-spacer");
+				const container = $("headlines-frame");
 
-		$("headlines-frame").addClassName(isCombinedMode() ? "cdm" : "normal");
+				if (hsp && hsp.offsetTop - 250 <= container.scrollTop + container.offsetHeight) {
 
-		const headlines_count = reply['headlines-info']['count'];
-		infscroll_disabled = parseInt(headlines_count) != 30;
+					hsp.innerHTML = "<span class='loading'><img src='images/indicator_tiny.gif'> " +
+						__("Loading, please wait...") + "</span>";
 
-		console.log('received', headlines_count, 'headlines, infscroll disabled=', infscroll_disabled);
+					Headlines.loadMoreHeadlines();
+					return;
+				}
+			}
 
-		vgroup_last_feed = reply['headlines-info']['vgroup_last_feed'];
-		current_first_id = reply['headlines']['first_id'];
+			if (getInitParam("cdm_auto_catchup") == 1) {
 
-		if (offset == 0) {
-			loaded_article_ids = [];
+				let rows = $$("#headlines-frame > div[id*=RROW][class*=Unread]");
 
-			dojo.html.set($("headlines-toolbar"),
+				for (let i = 0; i < rows.length; i++) {
+					const row = rows[i];
+
+					if ($("headlines-frame").scrollTop > (row.offsetTop + row.offsetHeight / 2)) {
+						const id = row.getAttribute("data-article-id")
+
+						if (catchup_id_batch.indexOf(id) == -1)
+							catchup_id_batch.push(id);
+
+					} else {
+						break;
+					}
+				}
+
+				if (Feeds.infscroll_disabled) {
+					const row = $$("#headlines-frame div[id*=RROW]").last();
+
+					if (row && $("headlines-frame").scrollTop >
+						(row.offsetTop + row.offsetHeight - 50)) {
+
+						console.log("we seem to be at an end");
+
+						if (getInitParam("on_catchup_show_next_feed") == "1") {
+							Feeds.openNextUnreadFeed();
+						}
+					}
+				}
+			}
+		} catch (e) {
+			console.warn("scrollHandler", e);
+		}
+	},
+	updateFloatingTitle: function(unread_only) {
+		if (!App.isCombinedMode()/* || !getInitParam("cdm_expanded")*/) return;
+
+		const hf = $("headlines-frame");
+		const elems = $$("#headlines-frame > div[id*=RROW]");
+		const ft = $("floatingTitle");
+
+		for (let i = 0; i < elems.length; i++) {
+			const row = elems[i];
+
+			if (row && row.offsetTop + row.offsetHeight > hf.scrollTop) {
+
+				const header = row.select(".header")[0];
+				const id = row.getAttribute("data-article-id");
+
+				if (unread_only || id != ft.getAttribute("data-article-id")) {
+					if (id != ft.getAttribute("data-article-id")) {
+
+						ft.setAttribute("data-article-id", id);
+						ft.innerHTML = header.innerHTML;
+						ft.firstChild.innerHTML = "<img class='anchor marked-pic' src='images/page_white_go.png' " +
+							"onclick=\"cdmScrollToArticleId(" + id + ", true)\">" + ft.firstChild.innerHTML;
+
+						initFloatingMenu();
+
+						const cb = ft.select(".rchk")[0];
+
+						if (cb)
+							cb.parentNode.removeChild(cb);
+					}
+
+					if (row.hasClassName("Unread"))
+						ft.addClassName("Unread");
+					else
+						ft.removeClassName("Unread");
+
+					PluginHost.run(PluginHost.HOOK_FLOATING_TITLE, row);
+				}
+
+				ft.style.marginRight = hf.offsetWidth - row.offsetWidth + "px";
+
+				if (header.offsetTop + header.offsetHeight < hf.scrollTop + ft.offsetHeight - 5 &&
+					row.offsetTop + row.offsetHeight >= hf.scrollTop + ft.offsetHeight - 5)
+					new Effect.Appear(ft, {duration: 0.3});
+				else
+					Element.hide(ft);
+
+				return;
+			}
+		}
+	},
+	unpackVisibleArticles: function() {
+		if (!App.isCombinedMode() || !getInitParam("cdm_expanded")) return;
+
+		const rows = $$("#headlines-frame div[id*=RROW][data-content]");
+		const threshold = $("headlines-frame").scrollTop + $("headlines-frame").offsetHeight + 600;
+
+		for (let i = 0; i < rows.length; i++) {
+			const row = rows[i];
+
+			if (row.offsetTop <= threshold) {
+				console.log("unpacking: " + row.id);
+
+				row.select(".content-inner")[0].innerHTML = row.getAttribute("data-content");
+				row.removeAttribute("data-content");
+
+				PluginHost.run(PluginHost.HOOK_ARTICLE_RENDERED_CDM, row);
+			} else {
+				break;
+			}
+		}
+	},
+	onLoaded: function(transport, offset) {
+		const reply = App.handleRpcJson(transport);
+
+		console.log("Headlines.onLoaded: offset=", offset);
+
+		let is_cat = false;
+		let feed_id = false;
+
+		if (reply) {
+
+			is_cat = reply['headlines']['is_cat'];
+			feed_id = reply['headlines']['id'];
+			last_search_query = reply['headlines']['search_query'];
+
+			if (feed_id != -7 && (feed_id != Feeds.getActiveFeedId() || is_cat != Feeds.activeFeedIsCat()))
+				return;
+
+			try {
+				if (offset == 0) {
+					$("headlines-frame").scrollTop = 0;
+
+					Element.hide("floatingTitle");
+					$("floatingTitle").setAttribute("data-article-id", 0);
+					$("floatingTitle").innerHTML = "";
+				}
+			} catch (e) {
+			}
+
+			$("headlines-frame").removeClassName("cdm");
+			$("headlines-frame").removeClassName("normal");
+
+			$("headlines-frame").addClassName(App.isCombinedMode() ? "cdm" : "normal");
+
+			const headlines_count = reply['headlines-info']['count'];
+			Feeds.infscroll_disabled = parseInt(headlines_count) != 30;
+
+			console.log('received', headlines_count, 'headlines, infscroll disabled=', Feeds.infscroll_disabled);
+
+			vgroup_last_feed = reply['headlines-info']['vgroup_last_feed'];
+			current_first_id = reply['headlines']['first_id'];
+
+			if (offset == 0) {
+				loaded_article_ids = [];
+
+				dojo.html.set($("headlines-toolbar"),
 					reply['headlines']['toolbar'],
 					{parseContent: true});
 
-			$("headlines-frame").innerHTML = '';
+				$("headlines-frame").innerHTML = '';
 
-			let tmp = document.createElement("div");
-			tmp.innerHTML = reply['headlines']['content'];
-			dojo.parser.parse(tmp);
+				let tmp = document.createElement("div");
+				tmp.innerHTML = reply['headlines']['content'];
+				dojo.parser.parse(tmp);
 
-			while (tmp.hasChildNodes()) {
-				const row = tmp.removeChild(tmp.firstChild);
+				while (tmp.hasChildNodes()) {
+					const row = tmp.removeChild(tmp.firstChild);
 
-				if (loaded_article_ids.indexOf(row.id) == -1 || row.hasClassName("feed-title")) {
-					dijit.byId("headlines-frame").domNode.appendChild(row);
+					if (loaded_article_ids.indexOf(row.id) == -1 || row.hasClassName("feed-title")) {
+						dijit.byId("headlines-frame").domNode.appendChild(row);
 
-					loaded_article_ids.push(row.id);
+						loaded_article_ids.push(row.id);
+					}
 				}
-			}
 
-			let hsp = $("headlines-spacer");
-			if (!hsp) hsp = new Element("DIV", {"id": "headlines-spacer"});
-			dijit.byId('headlines-frame').domNode.appendChild(hsp);
+				let hsp = $("headlines-spacer");
+				if (!hsp) hsp = new Element("DIV", {"id": "headlines-spacer"});
+				dijit.byId('headlines-frame').domNode.appendChild(hsp);
 
-			initHeadlinesMenu();
+				initHeadlinesMenu();
 
-			if (infscroll_disabled)
-				hsp.innerHTML = "<a href='#' onclick='openNextUnreadFeed()'>" +
-					__("Click to open next unread feed.") + "</a>";
+				if (Feeds.infscroll_disabled)
+					hsp.innerHTML = "<a href='#' onclick='Feeds.openNextUnreadFeed()'>" +
+						__("Click to open next unread feed.") + "</a>";
 
-			if (_search_query) {
-				$("feed_title").innerHTML += "<span id='cancel_search'>" +
-					" (<a href='#' onclick='cancelSearch()'>" + __("Cancel search") + "</a>)" +
-					"</span>";
-			}
-
-		} else if (headlines_count > 0 && feed_id == getActiveFeedId() && is_cat == activeFeedIsCat()) {
-			const c = dijit.byId("headlines-frame");
-			//const ids = getSelectedArticleIds2();
-
-			let hsp = $("headlines-spacer");
-
-			if (hsp)
-				c.domNode.removeChild(hsp);
-
-			let tmp = document.createElement("div");
-			tmp.innerHTML = reply['headlines']['content'];
-			dojo.parser.parse(tmp);
-
-			while (tmp.hasChildNodes()) {
-				let row = tmp.removeChild(tmp.firstChild);
-
-				if (loaded_article_ids.indexOf(row.id) == -1 || row.hasClassName("feed-title")) {
-					dijit.byId("headlines-frame").domNode.appendChild(row);
-
-					loaded_article_ids.push(row.id);
+				if (Feeds._search_query) {
+					$("feed_title").innerHTML += "<span id='cancel_search'>" +
+						" (<a href='#' onclick='Feeds.cancelSearch()'>" + __("Cancel search") + "</a>)" +
+						"</span>";
 				}
-			}
 
-			if (!hsp) hsp = new Element("DIV", {"id": "headlines-spacer"});
-			c.domNode.appendChild(hsp);
+			} else if (headlines_count > 0 && feed_id == Feeds.getActiveFeedId() && is_cat == Feeds.activeFeedIsCat()) {
+				const c = dijit.byId("headlines-frame");
+				//const ids = getSelectedArticleIds2();
 
-			if (headlines_count < 30) infscroll_disabled = true;
+				let hsp = $("headlines-spacer");
 
-			/* console.log("restore selected ids: " + ids);
+				if (hsp)
+					c.domNode.removeChild(hsp);
 
-			for (let i = 0; i < ids.length; i++) {
-				markHeadline(ids[i]);
-			} */
+				let tmp = document.createElement("div");
+				tmp.innerHTML = reply['headlines']['content'];
+				dojo.parser.parse(tmp);
 
-			initHeadlinesMenu();
+				while (tmp.hasChildNodes()) {
+					let row = tmp.removeChild(tmp.firstChild);
 
-			if (infscroll_disabled) {
-				hsp.innerHTML = "<a href='#' onclick='openNextUnreadFeed()'>" +
-				__("Click to open next unread feed.") + "</a>";
+					if (loaded_article_ids.indexOf(row.id) == -1 || row.hasClassName("feed-title")) {
+						dijit.byId("headlines-frame").domNode.appendChild(row);
+
+						loaded_article_ids.push(row.id);
+					}
+				}
+
+				if (!hsp) hsp = new Element("DIV", {"id": "headlines-spacer"});
+				c.domNode.appendChild(hsp);
+
+				/* console.log("restore selected ids: " + ids);
+
+				for (let i = 0; i < ids.length; i++) {
+					markHeadline(ids[i]);
+				} */
+
+				initHeadlinesMenu();
+
+				if (Feeds.infscroll_disabled) {
+					hsp.innerHTML = "<a href='#' onclick='Feeds.openNextUnreadFeed()'>" +
+						__("Click to open next unread feed.") + "</a>";
+				}
+
+			} else {
+				console.log("no new headlines received");
+
+				const first_id_changed = reply['headlines']['first_id_changed'];
+				console.log("first id changed:" + first_id_changed);
+
+				let hsp = $("headlines-spacer");
+
+				if (hsp) {
+					if (first_id_changed) {
+						hsp.innerHTML = "<a href='#' onclick='Feeds.viewCurrentFeed()'>" +
+							__("New articles found, reload feed to continue.") + "</a>";
+					} else {
+						hsp.innerHTML = "<a href='#' onclick='Feeds.openNextUnreadFeed()'>" +
+							__("Click to open next unread feed.") + "</a>";
+					}
+				}
 			}
 
 		} else {
-			console.log("no new headlines received");
-
-			const first_id_changed = reply['headlines']['first_id_changed'];
-			console.log("first id changed:" + first_id_changed);
-
-			let hsp = $("headlines-spacer");
-
-			if (hsp) {
-				if (first_id_changed) {
-					hsp.innerHTML = "<a href='#' onclick='viewCurrentFeed()'>" +
-					__("New articles found, reload feed to continue.") + "</a>";
-				} else {
-					hsp.innerHTML = "<a href='#' onclick='openNextUnreadFeed()'>" +
-					__("Click to open next unread feed.") + "</a>";
-				}
-			}
-		}
-
-	} else {
-		console.error("Invalid object received: " + transport.responseText);
-		dijit.byId("headlines-frame").attr('content', "<div class='whiteBox'>" +
+			console.error("Invalid object received: " + transport.responseText);
+			dijit.byId("headlines-frame").attr('content', "<div class='whiteBox'>" +
 				__('Could not update headlines (invalid object received - see error console for details)') +
 				"</div>");
-	}
+		}
 
-	infscroll_in_progress = 0;
+		Feeds.infscroll_in_progress = 0;
 
-	// this is used to auto-catchup articles if needed after infscroll request has finished,
-	// unpack visible articles, etc
-	headlinesScrollHandler();
+		// this is used to auto-catchup articles if needed after infscroll request has finished,
+		// unpack visible articles, etc
+		this.scrollHandler();
 
-	// if we have some more space in the buffer, why not try to fill it
-	if (!infscroll_disabled && $("headlines-spacer") &&
+		// if we have some more space in the buffer, why not try to fill it
+		if (!Feeds.infscroll_disabled && $("headlines-spacer") &&
 			$("headlines-spacer").offsetTop < $("headlines-frame").offsetHeight) {
 
-		window.setTimeout(function() {
-			loadMoreHeadlines();
-		}, 500);
-	}
+			window.setTimeout(function () {
+				this.loadMoreHeadlines();
+			}, 500);
+		}
 
-	notify("");
-}
-
-function render_article(article) {
-	cleanup_memory("content-insert");
-
-	dijit.byId("headlines-wrap-inner").addChild(
-			dijit.byId("content-insert"));
-
-	const c = dijit.byId("content-insert");
-
-	try {
-		c.domNode.scrollTop = 0;
-	} catch (e) { }
-
-	c.attr('content', article);
-	PluginHost.run(PluginHost.HOOK_ARTICLE_RENDERED, c.domNode);
-
-	correctHeadlinesOffset(getActiveArticleId());
-
-	try {
-		c.focus();
-	} catch (e) { }
-}
+		notify("");
+	},
+};
 
 function view(id, noexpand) {
 	setActiveArticleId(id);
@@ -220,19 +430,19 @@ function view(id, noexpand) {
 
 		if (cached_article) {
 			console.log('rendering cached', id);
-			render_article(cached_article);
+			Article.renderArticle(cached_article);
 			return false;
 		}
 
 		xhrPost("backend.php", {op: "article", method: "view", id: id, cids: cids.toString()}, (transport) => {
 			try {
-				const reply = handle_rpc_json(transport);
+				const reply = App.handleRpcJson(transport);
 
 				if (reply) {
 
 					reply.each(function(article) {
 						if (getActiveArticleId() == article['id']) {
-							render_article(article['content']);
+							Article.renderArticle(article['content']);
 						}
 						//cids_requested.remove(article['id']);
 
@@ -242,7 +452,7 @@ function view(id, noexpand) {
 				} else {
 					console.error("Invalid object received: " + transport.responseText);
 
-					render_article("<div class='whiteBox'>" +
+					Article.renderArticle("<div class='whiteBox'>" +
 						__('Could not display article (invalid object received - see error console for details)') + "</div>");
 				}
 
@@ -281,7 +491,7 @@ function toggleMark(id, client_only) {
 
 		if (!client_only)
 			xhrPost("backend.php", query, (transport) => {
-				handle_rpc_json(transport);
+				App.handleRpcJson(transport);
 			});
 	}
 }
@@ -308,7 +518,7 @@ function togglePub(id, client_only) {
 
 		if (!client_only)
 			xhrPost("backend.php", query, (transport) => {
-				handle_rpc_json(transport);
+				App.handleRpcJson(transport);
 			});
 
 	}
@@ -349,7 +559,7 @@ function moveToPost(mode, noscroll, noexpand) {
 
 	if (mode == "next") {
 		if (next_id || getActiveArticleId()) {
-			if (isCombinedMode()) {
+			if (App.isCombinedMode()) {
 
 				const article = $("RROW-" + getActiveArticleId());
 				const ctr = $("headlines-frame");
@@ -373,7 +583,7 @@ function moveToPost(mode, noscroll, noexpand) {
 
 	if (mode == "prev") {
 		if (prev_id || getActiveArticleId()) {
-			if (isCombinedMode()) {
+			if (App.isCombinedMode()) {
 
 				const article = $("RROW-" + getActiveArticleId());
 				const prev_article = $("RROW-" + prev_id);
@@ -432,7 +642,7 @@ function toggleUnread(id, cmode) {
 		if (row.className != origClassName)
 			xhrPost("backend.php",
 				{op: "rpc", method: "catchupSelected", cmode: cmode, ids: id},(transport) => {
-					handle_rpc_json(transport);
+					App.handleRpcJson(transport);
 			});
 	}
 }
@@ -449,7 +659,7 @@ function selectionRemoveLabel(id, ids) {
 		ids: ids.toString(), lid: id };
 
 	xhrPost("backend.php", query, (transport) => {
-		handle_rpc_json(transport);
+		App.handleRpcJson(transport);
 		updateHeadlineLabels(transport);
 	});
 }
@@ -466,7 +676,7 @@ function selectionAssignLabel(id, ids) {
 		ids: ids.toString(), lid: id };
 
 	xhrPost("backend.php", query, (transport) => {
-		handle_rpc_json(transport);
+		App.handleRpcJson(transport);
 		updateHeadlineLabels(transport);
 	});
 }
@@ -509,7 +719,7 @@ function selectionToggleUnread(params) {
 	notify_progress("Loading, please wait...");
 
 	xhrPost("backend.php", query, (transport) => {
-		handle_rpc_json(transport);
+		App.handleRpcJson(transport);
 		if (callback) callback(transport);
 	});
 }
@@ -530,7 +740,7 @@ function selectionToggleMarked(ids) {
 		ids:  rows.toString(), cmode: 2 };
 
 	xhrPost("backend.php", query, (transport) => {
-		handle_rpc_json(transport);
+		App.handleRpcJson(transport);
 	});
 }
 
@@ -552,7 +762,7 @@ function selectionTogglePublished(ids) {
 			ids:  rows.toString(), cmode: 2 };
 
 		xhrPost("backend.php", query, (transport) => {
-			handle_rpc_json(transport);
+			App.handleRpcJson(transport);
 		});
 	}
 }
@@ -652,10 +862,10 @@ function deleteSelection() {
 		return;
 	}
 
-	const fn = getFeedName(getActiveFeedId(), activeFeedIsCat());
+	const fn = getFeedName(Feeds.getActiveFeedId(), Feeds.activeFeedIsCat());
 	let str;
 
-	if (getActiveFeedId() != 0) {
+	if (Feeds.getActiveFeedId() != 0) {
 		str = ngettext("Delete %d selected article in %s?", "Delete %d selected articles in %s?", rows.length);
 	} else {
 		str = ngettext("Delete %d selected article?", "Delete %d selected articles?", rows.length);
@@ -671,8 +881,8 @@ function deleteSelection() {
 	const query = { op: "rpc", method: "delete", ids: rows.toString() };
 
 	xhrPost("backend.php", query, (transport) => {
-		handle_rpc_json(transport);
-		viewCurrentFeed();
+		App.handleRpcJson(transport);
+		Feeds.viewCurrentFeed();
 	});
 }
 
@@ -686,11 +896,11 @@ function archiveSelection() {
 		return;
 	}
 
-	const fn = getFeedName(getActiveFeedId(), activeFeedIsCat());
+	const fn = getFeedName(Feeds.getActiveFeedId(), Feeds.activeFeedIsCat());
 	let str;
 	let op;
 
-	if (getActiveFeedId() != 0) {
+	if (Feeds.getActiveFeedId() != 0) {
 		str = ngettext("Archive %d selected article in %s?", "Archive %d selected articles in %s?", rows.length);
 		op = "archive";
 	} else {
@@ -714,8 +924,8 @@ function archiveSelection() {
 	const query = {op: "rpc", method: op, ids: rows.toString()};
 
 	xhrPost("backend.php", query, (transport) => {
-		handle_rpc_json(transport);
-		viewCurrentFeed();
+		App.handleRpcJson(transport);
+		Feeds.viewCurrentFeed();
 	});
 }
 
@@ -728,7 +938,7 @@ function catchupSelection() {
 		return;
 	}
 
-	const fn = getFeedName(getActiveFeedId(), activeFeedIsCat());
+	const fn = getFeedName(Feeds.getActiveFeedId(), Feeds.activeFeedIsCat());
 
 	let str = ngettext("Mark %d selected article in %s as read?", "Mark %d selected articles in %s as read?", rows.length);
 
@@ -838,9 +1048,9 @@ function setActiveArticleId(id) {
 		if (row.hasClassName("Unread")) {
 
 			catchupBatchedArticles(() => {
-				decrementFeedCounter(getActiveFeedId(), activeFeedIsCat());
+				Feeds.decrementFeedCounter(Feeds.getActiveFeedId(), Feeds.activeFeedIsCat());
 				toggleUnread(id, 0);
-				updateFloatingTitle(true);
+				Headlines.updateFloatingTitle(true);
 			});
 
 		}
@@ -870,111 +1080,6 @@ function postMouseOut(id) {
 	post_under_pointer = false;
 }
 
-function unpackVisibleArticles() {
-	if (!isCombinedMode() || !getInitParam("cdm_expanded")) return;
-
-	const rows = $$("#headlines-frame div[id*=RROW][data-content]");
-	const threshold = $("headlines-frame").scrollTop + $("headlines-frame").offsetHeight + 600;
-
-	for (let i = 0; i < rows.length; i++) {
-		const row = rows[i];
-
-		if (row.offsetTop <= threshold) {
-			console.log("unpacking: " + row.id);
-
-			row.select(".content-inner")[0].innerHTML = row.getAttribute("data-content");
-			row.removeAttribute("data-content");
-
-			PluginHost.run(PluginHost.HOOK_ARTICLE_RENDERED_CDM, row);
-		} else {
-			break;
-		}
-	}
-}
-
-function headlinesScrollHandler(/* event */) {
-	try {
-		unpackVisibleArticles();
-
-		if (isCombinedMode()) {
-			updateFloatingTitle();
-
-			// set topmost child in the buffer as active
-			if (getInitParam("cdm_expanded") && getInitParam("cdm_auto_catchup") == 1) {
-
-				const rows = $$("#headlines-frame > div[id*=RROW]");
-
-				for (let i = 0; i < rows.length; i++) {
-					const row = rows[i];
-
-					if ($("headlines-frame").scrollTop <= row.offsetTop &&
-						row.offsetTop - $("headlines-frame").scrollTop < 100 &&
-						row.getAttribute("data-article-id") != getActiveArticleId()) {
-
-						setActiveArticleId(row.getAttribute("data-article-id"));
-						break;
-					}
-				}
-			}
-		}
-
-		if (!infscroll_disabled) {
-			const hsp = $("headlines-spacer");
-			const container = $("headlines-frame");
-
-			if (hsp && hsp.offsetTop - 250 <= container.scrollTop + container.offsetHeight) {
-
-				hsp.innerHTML = "<span class='loading'><img src='images/indicator_tiny.gif'> " +
-					__("Loading, please wait...") + "</span>";
-
-				loadMoreHeadlines();
-				return;
-			}
-		}
-
-		if (getInitParam("cdm_auto_catchup") == 1) {
-
-			let rows = $$("#headlines-frame > div[id*=RROW][class*=Unread]");
-
-			for (let i = 0; i < rows.length; i++) {
-				const row = rows[i];
-
-				if ($("headlines-frame").scrollTop > (row.offsetTop + row.offsetHeight/2)) {
-					const id = row.getAttribute("data-article-id")
-
-					if (catchup_id_batch.indexOf(id) == -1)
-						catchup_id_batch.push(id);
-
-				} else {
-					break;
-				}
-			}
-
-			if (infscroll_disabled) {
-				const row = $$("#headlines-frame div[id*=RROW]").last();
-
-				if (row && $("headlines-frame").scrollTop >
-					(row.offsetTop + row.offsetHeight - 50)) {
-
-					console.log("we seem to be at an end");
-
-					if (getInitParam("on_catchup_show_next_feed") == "1") {
-						openNextUnreadFeed();
-					}
-				}
-			}
-		}
-	} catch (e) {
-		console.warn("headlinesScrollHandler", e);
-	}
-}
-
-function openNextUnreadFeed() {
-	const is_cat = activeFeedIsCat();
-	const nuf = getNextUnreadFeed(getActiveFeedId(), is_cat);
-	if (nuf) viewfeed({feed: nuf, is_cat: is_cat});
-}
-
 function catchupBatchedArticles(callback) {
 	console.log("catchupBatchedArticles, size=", catchup_id_batch.length);
 
@@ -986,7 +1091,7 @@ function catchupBatchedArticles(callback) {
 			cmode: 0, ids: batch.toString() };
 
 		xhrPost("backend.php", query, (transport) => {
-			const reply = handle_rpc_json(transport);
+			const reply = App.handleRpcJson(transport);
 
 			if (reply) {
 				const batch = reply.ids;
@@ -998,7 +1103,7 @@ function catchupBatchedArticles(callback) {
 				});
 			}
 
-			updateFloatingTitle(true);
+			Headlines.updateFloatingTitle(true);
 
 			if (callback) callback();
 		});
@@ -1062,7 +1167,7 @@ function catchupRelativeToArticle(below, id) {
 				cmode: 0, ids: ids_to_mark.toString() };
 
 			xhrPost("backend.php", query, (transport) => {
-				handle_rpc_json(transport);
+				App.handleRpcJson(transport);
 			});
 		}
 	}
@@ -1073,7 +1178,7 @@ function getArticleUnderPointer() {
 }
 
 function scrollArticle(offset) {
-	if (!isCombinedMode()) {
+	if (!App.isCombinedMode()) {
 		const ci = $("content-insert");
 		if (ci) {
 			ci.scrollTop += offset;
@@ -1102,7 +1207,7 @@ function updateHeadlineLabels(transport) {
 function cdmClicked(event, id, in_body) {
 
 	if (!in_body && (event.ctrlKey || id == getActiveArticleId() || getInitParam("cdm_expanded"))) {
-		openArticleInNewWindow(id);
+		Article.openArticleInNewWindow(id);
 	}
 
 	setActiveArticleId(id);
@@ -1110,115 +1215,20 @@ function cdmClicked(event, id, in_body) {
 	if (!getInitParam("cdm_expanded"))
 		cdmScrollToArticleId(id);
 
-	//var shift_key = event.shiftKey;
-
-	/* if (!event.ctrlKey && !event.metaKey) {
-
-		let elem = $("RROW-" + getActiveArticleId());
-
-		if (elem) elem.removeClassName("active");
-
-		selectArticles("none");
-		toggleSelected(id);
-
-		elem = $("RROW-" + id);
-		const article_is_unread = elem.hasClassName("Unread");
-
-		elem.removeClassName("Unread");
-		elem.addClassName("active");
-
-		setActiveArticleId(id);
-
-		if (article_is_unread) {
-			decrementFeedCounter(getActiveFeedId(), activeFeedIsCat());
-			updateFloatingTitle(true);
-
-			const query = {
-				op: "rpc", method: "catchupSelected",
-				cmode: 0, ids: id
-			};
-
-			xhrPost("backend.php", query, (transport) => {
-				handle_rpc_json(transport);
-			});
-		}
-
-		return !event.shiftKey;
-
-	} else if (!in_body) {
-
-		toggleSelected(id, true);
-
-		let elem = $("RROW-" + id);
-		const article_is_unread = elem.hasClassName("Unread");
-
-		if (article_is_unread) {
-			decrementFeedCounter(getActiveFeedId(), activeFeedIsCat());
-		}
-
-		toggleUnread(id, 0, false);
-
-		openArticleInNewWindow(id);
-	} else {
-		return true;
-	}
-
-	const unread_in_buffer = $$("#headlines-frame > div[id*=RROW][class*=Unread]").length
-	request_counters(unread_in_buffer == 0); */
-
 	return false;
 }
 
 function hlClicked(event, id) {
 	if (event.ctrlKey) {
-		openArticleInNewWindow(id);
+		Article.openArticleInNewWindow(id);
 		setActiveArticleId(id);
 	} else {
 		view(id);
 	}
 
 	return false;
-
-	/* if (event.which == 2) {
-		view(id);
-		return true;
-	} else if (event.ctrlKey || event.metaKey) {
-		openArticleInNewWindow(id);
-		return false;
-	} else {
-		view(id);
-		return false;
-	} */
 }
 
-function openArticleInNewWindow(id) {
-	const w = window.open("");
-	w.opener = null;
-	w.location = "backend.php?op=article&method=redirect&id=" + id;
-}
-
-function isCombinedMode() {
-	return getInitParam("combined_display_mode");
-}
-
-/* function markHeadline(id, marked) {
-	if (marked == undefined) marked = true;
-
-	const row = $("RROW-" + id);
-	if (row) {
-		const check = dijit.getEnclosingWidget(
-				row.getElementsByClassName("rchk")[0]);
-
-		if (check) {
-			check.attr("checked", marked);
-		}
-
-		if (marked)
-			row.addClassName("Selected");
-		else
-			row.removeClassName("Selected");
-	}
-} */
 
 function getRelativePostIds(id, limit) {
 
@@ -1262,6 +1272,7 @@ function correctHeadlinesOffset(id) {
 	}
 }
 
+// noinspection JSUnusedGlobalSymbols
 function headlineActionsChange(elem) {
 	eval(elem.value);
 	elem.attr('value', 'false');
@@ -1286,12 +1297,6 @@ function cdmCollapseActive(event) {
 	}
 }
 
-function closeArticlePanel() {
-	if (dijit.byId("content-insert"))
-		dijit.byId("headlines-wrap-inner").removeChild(
-			dijit.byId("content-insert"));
-}
-
 function initFloatingMenu() {
 	if (!dijit.byId("floatingMenu")) {
 
@@ -1311,14 +1316,14 @@ function headlinesMenuCommon(menu) {
 	menu.addChild(new dijit.MenuItem({
 		label: __("Open original article"),
 		onClick: function (event) {
-			openArticleInNewWindow(this.getParent().currentTarget.getAttribute("data-article-id"));
+			Article.openArticleInNewWindow(this.getParent().currentTarget.getAttribute("data-article-id"));
 		}
 	}));
 
 	menu.addChild(new dijit.MenuItem({
 		label: __("Display article URL"),
 		onClick: function (event) {
-			displayArticleUrl(this.getParent().currentTarget.getAttribute("data-article-id"));
+			Article.displayArticleUrl(this.getParent().currentTarget.getAttribute("data-article-id"));
 		}
 	}));
 
@@ -1524,11 +1529,7 @@ function cache_delete(id) {
 		sessionStorage.removeItem(id);
 }
 
-function cancelSearch() {
-	_search_query = "";
-	viewCurrentFeed();
-}
-
+// noinspection JSUnusedGlobalSymbols
 function setSelectionScore() {
 	const ids = getSelectedArticleIds2();
 
@@ -1565,6 +1566,7 @@ function setSelectionScore() {
 	}
 }
 
+// noinspection JSUnusedGlobalSymbols
 function changeScore(id, pic) {
 	const score = pic.getAttribute("score");
 
@@ -1583,73 +1585,3 @@ function changeScore(id, pic) {
 	}
 }
 
-function displayArticleUrl(id) {
-	const query = { op: "rpc", method: "getlinktitlebyid", id: id };
-
-	xhrJson("backend.php", query, (reply) => {
-		if (reply && reply.link) {
-			prompt(__("Article URL:"), reply.link);
-		}
-	});
-
-}
-
-// floatingTitle goto button uses this
-/* function scrollToRowId(id) {
-	const row = $(id);
-
-	if (row)
-		$("headlines-frame").scrollTop = row.offsetTop - 4;
-} */
-
-function updateFloatingTitle(unread_only) {
-	if (!isCombinedMode()/* || !getInitParam("cdm_expanded")*/) return;
-
-	const hf = $("headlines-frame");
-	const elems = $$("#headlines-frame > div[id*=RROW]");
-	const ft = $("floatingTitle");
-
-	for (let i = 0; i < elems.length; i++) {
-		const row = elems[i];
-
-		if (row && row.offsetTop + row.offsetHeight > hf.scrollTop) {
-
-			const header = row.select(".header")[0];
-			var id = row.getAttribute("data-article-id");
-
-			if (unread_only || id != ft.getAttribute("data-article-id")) {
-				if (id != ft.getAttribute("data-article-id")) {
-
-					ft.setAttribute("data-article-id", id);
-					ft.innerHTML = header.innerHTML;
-					ft.firstChild.innerHTML = "<img class='anchor marked-pic' src='images/page_white_go.png' " +
-						"onclick=\"cdmScrollToArticleId("+id + ", true)\">" + ft.firstChild.innerHTML;
-
-					initFloatingMenu();
-
-					const cb = ft.select(".rchk")[0];
-
-					if (cb)
-						cb.parentNode.removeChild(cb);
-				}
-
-				if (row.hasClassName("Unread"))
-					ft.addClassName("Unread");
-				else
-					ft.removeClassName("Unread");
-
-				PluginHost.run(PluginHost.HOOK_FLOATING_TITLE, row);
-			}
-
-			ft.style.marginRight = hf.offsetWidth - row.offsetWidth + "px";
-
-			if (header.offsetTop + header.offsetHeight < hf.scrollTop + ft.offsetHeight - 5 &&
-				row.offsetTop + row.offsetHeight >= hf.scrollTop + ft.offsetHeight - 5)
-				new Effect.Appear(ft, {duration: 0.3});
-			else
-				Element.hide(ft);
-
-			return;
-		}
-	}
-}
diff --git a/plugins/af_psql_trgm/init.php b/plugins/af_psql_trgm/init.php
index fe5b1a959..ff11c1201 100644
--- a/plugins/af_psql_trgm/init.php
+++ b/plugins/af_psql_trgm/init.php
@@ -93,7 +93,7 @@ class Af_Psql_Trgm extends Plugin {
 				print " <a target=\"_blank\" rel=\"noopener noreferrer\" href=\"$article_link\">".
 					$line["title"]."</a>";
 
-				print " (<a href=\"#\" onclick=\"viewfeed({feed:".$line["feed_id"]."})\">".
+				print " (<a href=\"#\" onclick=\"Feeds.viewfeed({feed:".$line["feed_id"]."})\">".
 					htmlspecialchars($line["feed_title"])."</a>)";
 
 				print " <span class='insensitive'>($sm)</span>";
diff --git a/plugins/close_button/init.php b/plugins/close_button/init.php
index 66d2af679..62f8780c4 100644
--- a/plugins/close_button/init.php
+++ b/plugins/close_button/init.php
@@ -21,7 +21,7 @@ class Close_Button extends Plugin {
 		if (!get_pref("COMBINED_DISPLAY_MODE")) {
 			$rv = "<img src=\"plugins/close_button/button.png\"
 				class='tagsPic' style=\"cursor : pointer\"
-				onclick=\"closeArticlePanel()\"
+				onclick=\"Article.closeArticlePanel()\"
 				title='".__('Close article')."'>";
 		}
 
diff --git a/plugins/embed_original/init.js b/plugins/embed_original/init.js
index 3c48b507e..d0731d5d1 100644
--- a/plugins/embed_original/init.js
+++ b/plugins/embed_original/init.js
@@ -9,7 +9,7 @@ function embedOriginalArticle(id) {
 
 		let c = false;
 
-		if (isCombinedMode()) {
+		if (App.isCombinedMode()) {
 			c = $$("div#RROW-" + id + " div[class=content-inner]")[0];
 		} else if (id == getActiveArticleId()) {
 			c = $$(".post .content")[0];
@@ -22,7 +22,7 @@ function embedOriginalArticle(id) {
 				Element.show(c);
 				c.parentNode.removeChild(iframe);
 
-				if (isCombinedMode()) {
+				if (App.isCombinedMode()) {
 					cdmScrollToArticleId(id, true);
 				}
 
@@ -47,7 +47,7 @@ function embedOriginalArticle(id) {
 					Element.hide(c);
 					c.parentNode.insertBefore(iframe, c);
 
-					if (isCombinedMode()) {
+					if (App.isCombinedMode()) {
 						cdmScrollToArticleId(id, true);
 					}
 				}
diff --git a/plugins/no_title_counters/init.js b/plugins/no_title_counters/init.js
index 06edfb3ba..1170bf3ef 100644
--- a/plugins/no_title_counters/init.js
+++ b/plugins/no_title_counters/init.js
@@ -1,6 +1,6 @@
 require(['dojo/_base/kernel', 'dojo/ready'], function (dojo, ready) {
 	ready(function () {
-		updateTitle = function () {
+		App.updateTitle = function () {
 			document.title = "Tiny Tiny RSS";
 		};
 	});
diff --git a/plugins/toggle_sidebar/init.php b/plugins/toggle_sidebar/init.php
index b2b0821a5..2187e10ad 100644
--- a/plugins/toggle_sidebar/init.php
+++ b/plugins/toggle_sidebar/init.php
@@ -18,7 +18,7 @@ class Toggle_Sidebar extends Plugin {
 	function hook_main_toolbar_button() {
 		?>
 
-		<button dojoType="dijit.form.Button" onclick="collapse_feedlist()">
+		<button dojoType="dijit.form.Button" onclick="Feeds.collapseFeedlist()">
 			<img src="plugins/toggle_sidebar/application_side_list.png"
 				 title="<?php echo __('Collapse feedlist') ?>">
 		</button>