headlines scroll handler: add a rate limit

[tt-rss.git] / js / viewfeed.js

diff --git a/js/viewfeed.js b/js/viewfeed.js
index 0b37c071fa967df1af88ec35737e400421fb72f0..83ef3ac6006d7795dd4fff113c08f54b8435ae83 100755 (executable)
--- a/js/viewfeed.js
+++ b/js/viewfeed.js
@@ -13,6 +13,7 @@ var catchup_timeout_id = false;
 var cids_requested = [];
 var loaded_article_ids = [];
 var _last_headlines_update = 0;
+var _headlines_scroll_offset = 0;
 var current_first_id = 0;
 
 var _catchup_request_sent = false;
@@ -1265,6 +1266,14 @@ function unpackVisibleHeadlines() {
 
 function headlines_scroll_handler(e) {
        try {
+
+               // rate-limit in case of smooth scrolling and similar abominations
+               if (e.scrollTop - _headlines_scroll_offset < 10) {
+                       return;
+               }
+
+               _headlines_scroll_offset = e.scrollTop;
+
                var hsp = $("headlines-spacer");
 
                unpackVisibleHeadlines();
@@ -1273,6 +1282,7 @@ function headlines_scroll_handler(e) {
                if (isCdmMode() && getInitParam("cdm_auto_catchup") == 1 &&
                                getSelectedArticleIds2().length <= 1 &&
                                getInitParam("cdm_expanded")) {
+
                        var rows = $$("#headlines-frame > div[id*=RROW]");
 
                        for (var i = 0; i < rows.length; i++) {