]> git.wh0rd.org - tt-rss.git/blobdiff - viewfeed.js
infinite scrolling
[tt-rss.git] / viewfeed.js
index 6595b0b1a891b0f6b63dbbc22e0cf7e3c170fd21..e464f21981fbb1b7f42eb51eb70cb2b38dfb2314 100644 (file)
@@ -5,21 +5,28 @@ var active_real_feed_id = false;
 
 var _tag_active_post_id = false;
 var _tag_active_feed_id = false;
+var _tag_active_cdm = false;
 
-// FIXME: kludge, needs proper implementation
+// FIXME: kludge, to restore scrollTop after tag editor terminates
+var _tag_cdm_scroll = false;
+
+// FIXME: kludges, needs proper implementation
 var _reload_feedlist_after_view = false;
 
 var _cdm_wd_timeout = false;
 var _cdm_wd_vishist = new Array();
 
+var article_cache = new Array();
+
 function catchup_callback() {
        if (xmlhttp_rpc.readyState == 4) {
                try {
                        debug("catchup_callback");
+                       notify("");                     
+                       all_counters_callback();
                        if (_catchup_callback_func) {
-                               setTimeout(_catchup_callback_func, 100);        
+                               setTimeout(_catchup_callback_func, 10); 
                        }
-                       all_counters_callback();
                } catch (e) {
                        exception_error("catchup_callback", e);
                }
@@ -31,34 +38,146 @@ function headlines_callback() {
                debug("headlines_callback");
                var f = document.getElementById("headlines-frame");
                try {
-                       f.scrollTop = 0;
+                       if (feed_cur_page == 0) { 
+                               debug("resetting headlines scrollTop");
+                               f.scrollTop = 0; 
+                       }
                } catch (e) { };
-               f.innerHTML = xmlhttp.responseText;
-               update_all_counters();
+
+               if (xmlhttp.responseXML) {
+                       var headlines = xmlhttp.responseXML.getElementsByTagName("headlines")[0];
+                       var counters = xmlhttp.responseXML.getElementsByTagName("counters")[0];
+                       var articles = xmlhttp.responseXML.getElementsByTagName("article");
+                       var runtime_info = xmlhttp.responseXML.getElementsByTagName("runtime-info");
+
+                       if (feed_cur_page == 0) {
+                               if (headlines) {
+                                       f.innerHTML = headlines.firstChild.nodeValue;
+                               } else {
+                                       debug("headlines_callback: returned no data");
+                               f.innerHTML = "<div class='whiteBox'>" + __('Could not update headlines (missing XML data)') + "</div>";
+       
+                               }
+                       } else {
+                               if (headlines) {
+                                       debug("adding some more headlines...");
+
+                                       var c = document.getElementById("headlinesList");
+
+                                       if (!c) {
+                                               c = document.getElementById("headlinesInnerContainer");
+                                       }
+
+                                       c.innerHTML = c.innerHTML + headlines.firstChild.nodeValue;
+                               } else {
+                                       debug("headlines_callback: returned no data");
+                                       notify_error("Error while trying to load more headlines");      
+                               }
+
+                       }
+
+                       if (articles) {
+                               for (var i = 0; i < articles.length; i++) {
+                                       var a_id = articles[i].getAttribute("id");
+                                       debug("found id: " + a_id);
+                                       cache_inject(a_id, articles[i].firstChild.nodeValue);
+                               }
+                       } else {
+                               debug("no cached articles received");
+                       }
+
+                       if (counters) {
+                               debug("parsing piggybacked counters: " + counters);
+                               parse_counters(counters, false);
+                       } else {
+                               debug("counters container not found in reply");
+                       }
+
+                       if (runtime_info) {
+                               debug("parsing runtime info: " + runtime_info[0]);
+                               parse_runtime_info(runtime_info[0]);
+                       } else {
+                               debug("counters container not found in reply");
+                       }
+
+               } else {
+                       debug("headlines_callback: returned no XML object");
+                       f.innerHTML = "<div class='whiteBox'>" + __('Could not update headlines (missing XML object)') + "</div>";
+               }
+
                if (typeof correctPNG != 'undefined') {
                        correctPNG();
                }
 
                if (_cdm_wd_timeout) window.clearTimeout(_cdm_wd_timeout);
 
-               if (!document.getElementById("headlinesList")) {
+               if (!document.getElementById("headlinesList") && 
+                               getInitParam("cdm_auto_catchup") == 1) {
                        debug("starting CDM watchdog");
                        _cdm_wd_timeout = window.setTimeout("cdmWatchdog()", 5000);
                        _cdm_wd_vishist = new Array();
+               } else {
+                       debug("not in CDM mode or watchdog disabled");
+               }
+
+               if (_tag_cdm_scroll) {
+                       try {
+                               document.getElementById("headlinesInnerContainer").scrollTop = _tag_cdm_scroll;
+                               _tag_cdm_scroll = false;
+                               debug("resetting headlinesInner scrollTop");
+
+                       } catch (e) { }
                }
 
                notify("");
        }
 }
 
-function article_callback() {
-       if (xmlhttp.readyState == 4) {
-               debug("article_callback");
+function render_article(article) {
+       try {
                var f = document.getElementById("content-frame");
                try {
                        f.scrollTop = 0;
                } catch (e) { };
-               f.innerHTML = xmlhttp.responseText;
+
+               f.innerHTML = article;
+
+       } catch (e) {
+               exception_error("render_article", e);
+       }
+}
+
+function article_callback() {
+       if (xmlhttp.readyState == 4) {
+               debug("article_callback");
+
+               try {
+                       if (xmlhttp.responseXML) {
+                               var reply = xmlhttp.responseXML.firstChild.firstChild;
+
+                               var articles = xmlhttp.responseXML.getElementsByTagName("article");
+
+                               for (var i = 0; i < articles.length; i++) {
+                                       var a_id = articles[i].getAttribute("id");
+
+                                       debug("found id: " + a_id);
+
+                                       if (a_id == active_post_id) {
+                                               debug("active article, rendering...");                                  
+                                               render_article(articles[i].firstChild.nodeValue);
+                                       }
+
+                                       cache_inject(a_id, articles[i].firstChild.nodeValue);
+                               }
+                       
+                       } else {
+                               debug("article_callback: returned no XML object");
+                               var f = document.getElementById("content-frame");
+                               f.innerHTML = "<div class='whiteBox'>" + __('Could not display article (missing XML object)') + "</div>";
+                       }
+               } catch (e) {
+                       exception_error("article_callback", e);
+               }
 
                var date = new Date();
                last_article_view = date.getTime() / 1000;
@@ -71,8 +190,17 @@ function article_callback() {
                        setTimeout('updateFeedList(false, false)', 50);                 
                        _reload_feedlist_after_view = false;
                } else {
-                       update_all_counters();
+                       var counters = xmlhttp.responseXML.getElementsByTagName("counters")[0];
+
+                       if (counters) {
+                               debug("parsing piggybacked counters: " + counters);
+                               parse_counters(counters, false);
+                       } else {
+                               debug("counters container not found in reply");
+                       }
                }
+
+               notify("");
        }
 }
 
@@ -83,13 +211,12 @@ function view(id, feed_id, skip_history) {
 
                active_real_feed_id = feed_id;
 
-               if (!skip_history) {
-                       history_push("ARTICLE:" + id + ":" + feed_id);
-               }
+               var cached_article = cache_find(id);
+
+               debug("cache check result: " + (cached_article != false));
        
                enableHotkeys();
        
-               active_post_id = id; 
                //setActiveFeedId(feed_id);
 
                var query = "backend.php?op=view&id=" + param_escape(id) +
@@ -100,13 +227,23 @@ function view(id, feed_id, skip_history) {
                if (!xmlhttp_ready(xmlhttp) && last_article_view < date.getTime() / 1000 - 15) {
                        debug("<b>xmlhttp seems to be stuck at view, aborting</b>");
                        xmlhttp.abort();
+                       if (is_safari()) {
+                               debug("trying alternative reset method for Safari");
+                               xmlhttp = Ajax.getTransport();
+                       }
                }
 
                if (xmlhttp_ready(xmlhttp)) {
 
+                       active_post_id = id; 
+
                        cleanSelected("headlinesList");
 
                        var crow = document.getElementById("RROW-" + active_post_id);
+
+                       var article_is_unread = crow.className.match("Unread");
+                       debug("article is unread: " + article_is_unread);                       
+
                        crow.className = crow.className.replace("Unread", "");
 
                        var upd_img_pic = document.getElementById("FUPDPIC-" + active_post_id);
@@ -118,9 +255,71 @@ function view(id, feed_id, skip_history) {
                        selectTableRowsByIdPrefix('headlinesList', 'RROW-', 'RCHK-', false);
                        markHeadline(active_post_id);
 
-                       xmlhttp.open("GET", query, true);
-                       xmlhttp.onreadystatechange=article_callback;
-                       xmlhttp.send(null);
+                       var neighbor_ids = getRelativePostIds(active_post_id);
+
+                       /* only request uncached articles */
+
+                       var cids_to_request = Array();
+
+                       for (var i = 0; i < neighbor_ids.length; i++) {
+                               if (!cache_check(neighbor_ids[i])) {
+                                       cids_to_request.push(neighbor_ids[i]);
+                               }
+                       }
+
+                       debug("additional ids: " + cids_to_request.toString());                 
+
+                       /* additional info for piggyback counters */
+
+                       if (tagsAreDisplayed()) {
+                               query = query + "&omode=lt";
+                       } else {
+                               query = query + "&omode=flc";
+                       }
+
+                       var date = new Date();
+                       var timestamp = Math.round(date.getTime() / 1000);
+                       query = query + "&ts=" + timestamp;
+
+                       query = query + "&cids=" + cids_to_request.toString();
+
+                       if (!cached_article) {
+
+                               notify_progress("Loading, please wait...");
+
+                               debug(query);
+
+                               xmlhttp.open("GET", query, true);
+                               xmlhttp.onreadystatechange=article_callback;
+                               xmlhttp.send(null);
+                       } else if (cached_article && article_is_unread) {
+
+                               query = query + "&mode=prefetch";
+
+                               debug(query);
+
+                               xmlhttp.open("GET", query, true);
+                               xmlhttp.onreadystatechange=article_callback;
+                               xmlhttp.send(null);
+
+                               render_article(cached_article);
+
+                       } else if (cached_article) {
+
+                               query = query + "&mode=prefetch_old";
+
+                               debug(query);
+
+                               xmlhttp.open("GET", query, true);
+                               xmlhttp.onreadystatechange=article_callback;
+                               xmlhttp.send(null);
+
+                               render_article(cached_article);
+
+                       }
+
+                       cache_expire();
+
                } else {
                        debug("xmlhttp busy (@view)");
                        printLockingError();
@@ -131,6 +330,10 @@ function view(id, feed_id, skip_history) {
        }
 }
 
+function tMark(id) {
+       return toggleMark(id);
+}
+
 function toggleMark(id) {
 
        if (!xmlhttp_ready(xmlhttp_rpc)) {
@@ -140,7 +343,7 @@ function toggleMark(id) {
 
        var query = "backend.php?op=rpc&id=" + id + "&subop=mark";
 
-       var mark_img = document.getElementById("FMARKPIC-" + id);
+       var mark_img = document.getElementById("FMPIC-" + id);
        var vfeedu = document.getElementById("FEEDU--1");
        var crow = document.getElementById("RROW-" + id);
 
@@ -185,6 +388,38 @@ function toggleMark(id) {
 
 }
 
+function correctHeadlinesOffset(id) {
+       
+       try {
+
+               var hlist = document.getElementById("headlinesList");
+               var container = document.getElementById("headlinesInnerContainer");
+               var row = document.getElementById("RROW-" + id);
+       
+               var viewport = container.offsetHeight;
+       
+               var rel_offset_top = row.offsetTop - container.scrollTop;
+               var rel_offset_bottom = row.offsetTop + row.offsetHeight - container.scrollTop;
+       
+               debug("Rtop: " + rel_offset_top + " Rbtm: " + rel_offset_bottom);
+               debug("Vport: " + viewport);
+
+               if (rel_offset_top <= 0 || rel_offset_top > viewport) {
+                       container.scrollTop = row.offsetTop;
+               } else if (rel_offset_bottom > viewport) {
+
+                       /* doesn't properly work with Opera in some cases because
+                               Opera fucks up element scrolling */
+
+                       container.scrollTop = row.offsetTop + row.offsetHeight - viewport;              
+               } 
+
+       } catch (e) {
+               exception_error("correctHeadlinesOffset", e);
+       }
+
+}
+
 function moveToPost(mode) {
 
        // check for combined mode
@@ -193,8 +428,8 @@ function moveToPost(mode) {
 
        var rows = getVisibleHeadlineIds();
 
-       var prev_id;
-       var next_id;
+       var prev_id = false;
+       var next_id = false;
 
        if (!document.getElementById('RROW-' + active_post_id)) {
                active_post_id = false;
@@ -213,13 +448,15 @@ function moveToPost(mode) {
        }
 
        if (mode == "next") {
-               if (next_id != undefined) {
+               if (next_id) {
+                       correctHeadlinesOffset(next_id);
                        view(next_id, getActiveFeedId());
                }
        }
 
        if (mode == "prev") {
-               if ( prev_id != undefined) {
+               if (prev_id) {
+                       correctHeadlinesOffset(prev_id);
                        view(prev_id, getActiveFeedId());
                }
        } 
@@ -249,6 +486,8 @@ function toggleUnread(id, cmode) {
                        var query = "backend.php?op=rpc&subop=catchupSelected&ids=" +
                                param_escape(id) + "&cmode=" + param_escape(cmode);
 
+                       notify_progress("Loading, please wait...");
+
                        xmlhttp_rpc.open("GET", query, true);
                        xmlhttp_rpc.onreadystatechange=all_counters_callback;
                        xmlhttp_rpc.send(null);
@@ -261,7 +500,7 @@ function toggleUnread(id, cmode) {
        }
 }
 
-function selectionToggleUnread(cdm_mode, set_state, callback_func) {
+function selectionToggleUnread(cdm_mode, set_state, callback_func, no_error) {
        try {
                if (!xmlhttp_ready(xmlhttp_rpc)) {
                        printLockingError();
@@ -276,6 +515,11 @@ function selectionToggleUnread(cdm_mode, set_state, callback_func) {
                        rows = getSelectedTableRowIds("headlinesList", "RROW", "RCHK");
                }
 
+               if (rows.length == 0 && !no_error) {
+                       alert(__("No articles are selected."));
+                       return;
+               }
+
                for (i = 0; i < rows.length; i++) {
                        var row = document.getElementById("RROW-" + rows[i]);
                        if (row) {
@@ -308,6 +552,8 @@ function selectionToggleUnread(cdm_mode, set_state, callback_func) {
 
                        _catchup_callback_func = callback_func;
 
+                       notify_progress("Loading, please wait...");
+
                        xmlhttp_rpc.open("GET", query, true);
                        xmlhttp_rpc.onreadystatechange=catchup_callback;
                        xmlhttp_rpc.send(null);
@@ -334,6 +580,11 @@ function selectionToggleMarked(cdm_mode) {
                        rows = getSelectedTableRowIds("headlinesList", "RROW", "RCHK");
                }       
 
+               if (rows.length == 0) {
+                       alert(__("No articles are selected."));
+                       return;
+               }
+
                for (i = 0; i < rows.length; i++) {
                        var row = document.getElementById("RROW-" + rows[i]);
                        var mark_img = document.getElementById("FMARKPIC-" + rows[i]);
@@ -419,13 +670,21 @@ function cdmSelectArticles(mode) {
 
 function catchupPage() {
 
+       var fn = getFeedName(getActiveFeedId(), active_feed_is_cat);
+       
+       var str = "Mark all visible articles in " + fn + " as read?";
+
+       if (getInitParam("confirm_feed_catchup") == 1 && !confirm(str)) {
+               return;
+       }
+
        if (document.getElementById("headlinesList")) {
                selectTableRowsByIdPrefix('headlinesList', 'RROW-', 'RCHK-', true, 'Unread', true);
-               selectionToggleUnread(false, false, 'viewCurrentFeed()');
+               selectionToggleUnread(false, false, 'viewCurrentFeed()', true);
                selectTableRowsByIdPrefix('headlinesList', 'RROW-', 'RCHK-', false);
        } else {
                cdmSelectArticles('all');
-               selectionToggleUnread(true, false, 'viewCurrentFeed()')
+               selectionToggleUnread(true, false, 'viewCurrentFeed()', true)
                cdmSelectArticles('none');
        }
 }
@@ -454,9 +713,16 @@ function labelFromSearch(search, search_mode, match_on, feed_id, is_cat) {
 
 }
 
-function editArticleTags(id, feed_id) {
+function editArticleTags(id, feed_id, cdm_enabled) {
        _tag_active_post_id = id;
        _tag_active_feed_id = feed_id;
+       _tag_active_cdm = cdm_enabled;
+
+       cache_invalidate(id);
+
+       try {
+               _tag_cdm_scroll = document.getElementById("headlinesInnerContainer").scrollTop;
+       } catch (e) { }
        displayDlg('editArticleTags', id);
 }
 
@@ -473,10 +739,15 @@ function tag_saved_callback() {
                                _reload_feedlist_after_view = true;
                        }
 
-                       if (active_post_id == _tag_active_post_id) {
-                               debug("reloading current article");
-                               view(_tag_active_post_id, _tag_active_feed_id);                 
-                       } 
+                       if (!_tag_active_cdm) {
+                               if (active_post_id == _tag_active_post_id) {
+                                       debug("reloading current article");
+                                       view(_tag_active_post_id, _tag_active_feed_id);                 
+                               }
+                       } else {
+                               debug("reloading current feed");
+                               viewCurrentFeed();
+                       }
 
                } catch (e) {
                        exception_error("catchup_callback", e);
@@ -490,13 +761,17 @@ function editTagsSave() {
                printLockingError();
        }
 
-       notify("Saving article tags...");
+       notify_progress("Saving article tags...");
 
        var form = document.forms["tag_edit_form"];
 
        var query = Form.serialize("tag_edit_form");
 
-       xmlhttp_rpc.open("GET", "backend.php?op=rpc&subop=setArticleTags&" + query, true);                      
+       query = "backend.php?op=rpc&subop=setArticleTags&" + query;
+
+       debug(query);
+
+       xmlhttp_rpc.open("GET", query, true);                   
        xmlhttp_rpc.onreadystatechange=tag_saved_callback;
        xmlhttp_rpc.send(null);
 
@@ -533,7 +808,7 @@ function cdmWatchdog() {
 
                var ctr = document.getElementById("headlinesInnerContainer");
 
-               if (!ctr.hasChildNodes()) return;
+               if (!ctr) return;
 
                var ids = new Array();
 
@@ -563,6 +838,15 @@ function cdmWatchdog() {
 
                                }
 
+                               // method 2: article bottom is visible and is in upper 1/2 of the viewport
+
+/*                             if (e.offsetTop + e.offsetHeight >= ctr.scrollTop &&
+                                               e.offsetTop + e.offsetHeight <= ctr.scrollTop + ctr.offsetHeight/2) {
+
+                                       ids.push(e.id.replace("RROW-", "")); 
+
+                               } */
+
                        }
 
                        e = e.nextSibling;
@@ -584,14 +868,111 @@ function cdmWatchdog() {
 
                        xmlhttp_rpc.open("GET", query, true);
                        xmlhttp_rpc.onreadystatechange=all_counters_callback;
-                       xmlhttp_rpc.send(null);
+                       xmlhttp_rpc.send(null); 
 
                }
 
-               _cdm_wd_timeout = window.setTimeout("cdmWatchdog()", 5000);
+               _cdm_wd_timeout = window.setTimeout("cdmWatchdog()", 4000);
 
        } catch (e) {
                exception_error(e, "cdmWatchdog");
        }
 
 }
+
+
+function cache_inject(id, article) {
+       if (!cache_check(id)) {
+               debug("cache_article: miss: " + id);
+
+               var cache_obj = new Array();
+
+               cache_obj["id"] = id;
+               cache_obj["data"] = article;
+
+               article_cache.push(cache_obj);
+
+       } else {
+               debug("cache_article: hit: " + id);
+       }
+}
+
+function cache_find(id) {
+       for (var i = 0; i < article_cache.length; i++) {
+               if (article_cache[i]["id"] == id) {
+                       return article_cache[i]["data"];
+               }
+       }
+       return false;
+}
+
+function cache_check(id) {
+       for (var i = 0; i < article_cache.length; i++) {
+               if (article_cache[i]["id"] == id) {
+                       return true;
+               }
+       }
+       return false;
+}
+
+function cache_expire() {
+       while (article_cache.length > 20) {
+               article_cache.shift();
+       }
+}
+
+function cache_invalidate(id) {
+       var i = 0
+
+       try {   
+
+               while (i < article_cache.length) {
+                       if (article_cache[i]["id"] == id) {
+                               debug("cache_invalidate: removed id " + id);
+                               article_cache.splice(i, 1);
+                               return true;
+                       }
+                       i++;
+               }
+               debug("cache_invalidate: id not found: " + id);
+               return false;
+       } catch (e) {
+               exception_error("cache_invalidate", e);
+       }
+}
+
+function getActiveArticleId() {
+       return active_post_id;
+}
+
+function cdmMouseIn(elem) {
+       try {
+               if (elem.id && elem.id.match("RROW-")) {
+                       var id = elem.id.replace("RROW-", "");
+                       active_post_id = id;
+               }
+       } catch (e) {
+               exception_error("cdmMouseIn", e);
+       }
+
+}
+
+function cdmMouseOut(elem) {
+       active_post_id = false;
+}
+
+function headlines_scroll_handler() {
+       try {
+
+               var e = document.getElementById("headlinesInnerContainer");
+
+               if (e.scrollTop + e.offsetHeight == e.scrollHeight) {
+                       debug("more cowbell!");
+
+                       viewNextFeedPage();
+               }
+
+       } catch (e) {
+               exception_error("headlines_scroll_handler", e);
+       }
+}