From ce14841cc05e500819c0cdb2c594be8b44e91e2d Mon Sep 17 00:00:00 2001
From: Alexandre Alapetite <alexandre@alapetite.fr>
Date: Sun, 16 Oct 2016 12:31:13 +0200
Subject: Scroll as read for Global view + throttle event

https://github.com/FreshRSS/FreshRSS/issues/1317
https://github.com/FreshRSS/FreshRSS/pull/1309
---
 p/scripts/main.js | 28 ++++++++++++----------------
 1 file changed, 12 insertions(+), 16 deletions(-)

(limited to 'p/scripts')

diff --git a/p/scripts/main.js b/p/scripts/main.js
index b3531e884..400abf947 100644
--- a/p/scripts/main.js
+++ b/p/scripts/main.js
@@ -449,26 +449,22 @@ function auto_share(key) {
 	}
 }
 
-function inMarkViewport(flux, box_to_follow) {
-	var bottom = flux.offset().top + flux.height(),
-		windowTop = box_to_follow.scrollTop();
-	return bottom < windowTop + 40;
-}
-
 function init_posts() {
-	var box_to_follow = $(window);
-	if (context.current_view === 'global') {
-		box_to_follow = $("#panel");
-	}
+	var box_to_follow = context.current_view === 'global' ? $("#panel") : $(window);
 
 	if (context.auto_mark_scroll) {
+		var lastScroll = 0;	//Throttle
 		box_to_follow.scroll(function () {
-			$('.not_read:visible').each(function () {
-				var $this = $(this);
-				if (inMarkViewport($this, box_to_follow)) {
-					mark_read($this, true);
-				}
-			});
+			if (lastScroll + 500 < Date.now()) {
+				lastScroll = Date.now();
+				$('.not_read:visible').each(function () {
+					var $this = $(this),
+						minTop = (context.current_view === 'global') ? box_to_follow.offset().top : box_to_follow.scrollTop();
+					if ($this.offset().top + $this.height() < minTop + 40) {
+						mark_read($this, true);
+					}
+				});
+			}
 		});
 	}
 
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