add low bandwidth mode (less automatic requests in the background)

backend.php

@@ -206,11 +206,13 @@
 				catchupArticleById($link, $id, 0);
 			}
 
+			if (!$_SESSION["bw_limit"]) {
 				foreach ($cids as $cid) {
 					if ($cid) {
 						outputArticleXML($link, $cid, $feed_id, false);
 					}
 				}
+			}
 
 			if ($mode == "prefetch" && $csync) {
 				print "<counters>";
@@ -280,7 +282,7 @@
 	
 				if ($_GET["debug"]) $timing_info = print_checkpoint("10", $timing_info);
 	
-				if (is_array($topmost_article_ids) && !get_pref($link, 'COMBINED_DISPLAY_MODE')) {
+				if (is_array($topmost_article_ids) && !get_pref($link, 'COMBINED_DISPLAY_MODE') && !$_SESSION["bw_limit"]) {
 					print "<articles>";
 					foreach ($topmost_article_ids as $id) {
 						outputArticleXML($link, $id, $feed, false);

feedlist.js

@@ -537,6 +537,8 @@ function request_counters() {
 
 	try {
 
+		if (getInitParam("bw_limit") == "1") return;
+
 		var date = new Date();
 		var timestamp = Math.round(date.getTime() / 1000);
 

functions.php

@@ -1848,6 +1848,7 @@
 					$_POST["password"] = "";
 
 					$_SESSION["language"] = $_POST["language"];
+					$_SESSION["bw_limit"] = !!$_POST["bw_limit"];
 
 					header("Location: " . $_SERVER["REQUEST_URI"]);
 					exit;
@@ -3014,6 +3015,9 @@
 		print "<param key=\"hide_feedlist\" value=\"" .
 			(int) get_pref($link, "HIDE_FEEDLIST") . "\"/>";
 
+		print "<param key=\"bw_limit\" value=\"".
+			(int) $_SESSION["bw_limit"]."\"/>";
+
 		print "</init-params>";
 	}
 

login_form.php

@@ -22,6 +22,12 @@ function init() {
 
 	var login = document.forms["loginForm"].login;
 
+	var limit_set = getCookie("ttrss_bwlimit");
+
+	if (limit_set == "true") {
+		document.forms["loginForm"].bw_limit.checked = true;
+	}
+
 	login.focus();
 
 }
@@ -37,6 +43,18 @@ function languageChange(elem) {
 	}
 }
 
+function bwLimitChange(elem) {
+	try {
+		var limit_set = elem.checked;
+
+		setCookie("ttrss_bwlimit", limit_set, 
+			<?php print SESSION_COOKIE_LIFETIME ?>);
+
+	} catch (e) {
+		exception_error("bwLimitChange", e);
+	}
+}
+
 function validateLoginForm(f) {
 	try {
 
@@ -100,6 +118,7 @@ window.onload = init;
 				<input type="checkbox" name="remember_me" id="remember_me">
 				<label for="remember_me">Remember me on this computer</label>
 			</td></tr> -->
+
 			<tr><td colspan="2" align="right" class="innerLoginCell">
 
 			<?php if (defined('_ENABLE_REGISTRATION')) { ?>
@@ -111,6 +130,18 @@ window.onload = init;
 				<input type="hidden" name="rt" 
 					value="<?php if ($return_to != 'none') { echo $return_to; } ?>">
 			</td></tr>
+
+			<tr><td colspan="2" align="right" class="innerLoginCell">
+
+			<div class="small">
+			<input name="bw_limit" id="bw_limit" type="checkbox"
+				onchange="bwLimitChange(this)">
+			<label for="bw_limit">
+			<?php echo __("Limit bandwidth use") ?></label></div>
+
+			</td></tr>
+
+
 		</table>
 	</td>
 </tr><tr>

tt-rss.js

@@ -259,6 +259,8 @@ function viewfeed(feed, subop) {
 }
 
 function timeout() {
+	if (getInitParam("bw_limit") == "1") return;
+
 	scheduleFeedUpdate(false);
 
 	var refresh_time = getInitParam("feeds_frame_refresh");

viewfeed.js

@@ -1562,6 +1562,8 @@ function preload_article_callback(transport) {
 
 function preloadArticleUnderPointer(id) {
 	try {
+		if (getInitParam("bw_limit") == "1") return;
+
 		if (post_under_pointer == id && !cache_check(id)) {
 
 			debug("trying to preload article " + id);