update Piwik to version 2.16 (fixes #91)

www/analytics/libs/bower_components/visibilityjs/lib/visibility.timers.js

@@ -0,0 +1,163 @@
+;(function (window) {
+    "use strict";
+
+    var lastTimer = -1;
+
+    var install = function (Visibility) {
+
+        // Run callback every `interval` milliseconds if page is visible and
+        // every `hiddenInterval` milliseconds if page is hidden.
+        //
+        //   Visibility.every(60 * 1000, 5 * 60 * 1000, function () {
+        //       checkNewMails();
+        //   });
+        //
+        // You can skip `hiddenInterval` and callback will be called only if
+        // page is visible.
+        //
+        //   Visibility.every(1000, function () {
+        //       updateCountdown();
+        //   });
+        //
+        // It is analog of `setInterval(callback, interval)` but use visibility
+        // state.
+        //
+        // It return timer ID, that you can use in `Visibility.stop(id)` to stop
+        // timer (`clearInterval` analog).
+        // Warning: timer ID is different from interval ID from `setInterval`,
+        // so don’t use it in `clearInterval`.
+        //
+        // On change state from hidden to visible timers will be execute.
+        Visibility.every = function (interval, hiddenInterval, callback) {
+            Visibility._time();
+
+            if ( !callback ) {
+                callback = hiddenInterval;
+                hiddenInterval = null;
+            }
+
+            lastTimer += 1;
+            var number = lastTimer;
+
+            Visibility._timers[number] = {
+                visible:  interval,
+                hidden:   hiddenInterval,
+                callback: callback
+            };
+            Visibility._run(number, false);
+
+            if ( Visibility.isSupported() ) {
+                Visibility._listen();
+            }
+            return number;
+        };
+
+        // Stop timer from `every` method by it ID (`every` method return it).
+        //
+        //   slideshow = Visibility.every(5 * 1000, function () {
+        //       changeSlide();
+        //   });
+        //   $('.stopSlideshow').click(function () {
+        //       Visibility.stop(slideshow);
+        //   });
+        Visibility.stop = function(id) {
+            if ( !Visibility._timers[id] ) {
+                return false;
+            }
+            Visibility._stop(id);
+            delete Visibility._timers[id];
+            return true;
+        };
+
+        // Callbacks and intervals added by `every` method.
+        Visibility._timers = { };
+
+        // Initialize variables on page loading.
+        Visibility._time = function () {
+            if ( Visibility._timed ) {
+                return;
+            }
+            Visibility._timed     = true;
+            Visibility._wasHidden = Visibility.hidden();
+
+            Visibility.change(function () {
+                Visibility._stopRun();
+                Visibility._wasHidden = Visibility.hidden();
+            });
+        };
+
+        // Try to run timer from every method by it’s ID. It will be use
+        // `interval` or `hiddenInterval` depending on visibility state.
+        // If page is hidden and `hiddenInterval` is null,
+        // it will not run timer.
+        //
+        // Argument `runNow` say, that timers must be execute now too.
+        Visibility._run = function (id, runNow) {
+            var interval,
+                timer = Visibility._timers[id];
+
+            if ( Visibility.hidden() ) {
+                if ( null === timer.hidden ) {
+                    return;
+                }
+                interval = timer.hidden;
+            } else {
+                interval = timer.visible;
+            }
+
+            var runner = function () {
+                timer.last = new Date();
+                timer.callback.call(window);
+            }
+
+            if ( runNow ) {
+                var now  = new Date();
+                var last = now - timer.last ;
+
+                if ( interval > last ) {
+                    timer.delay = setTimeout(function () {
+                        runner();
+                        timer.id = setInterval(runner, interval);
+                    }, interval - last);
+                } else {
+                    runner();
+                    timer.id = setInterval(runner, interval);
+                }
+
+            } else {
+              timer.id = setInterval(runner, interval);
+            }
+        };
+
+        // Stop timer from `every` method by it’s ID.
+        Visibility._stop = function (id) {
+            var timer = Visibility._timers[id];
+            clearInterval(timer.id);
+            clearTimeout(timer.delay);
+            delete timer.id;
+            delete timer.delay;
+        };
+
+        // Listener for `visibilitychange` event.
+        Visibility._stopRun = function (event) {
+            var isHidden  = Visibility.hidden(),
+                wasHidden = Visibility._wasHidden;
+
+            if ( (isHidden && !wasHidden) || (!isHidden && wasHidden) ) {
+                for ( var i in Visibility._timers ) {
+                    Visibility._stop(i);
+                    Visibility._run(i, !isHidden);
+                }
+            }
+        };
+
+        return Visibility;
+    }
+
+    if ( typeof(module) != 'undefined' && module.exports ) {
+        module.exports = install(require('./visibility.core'));
+    } else {
+        install(window.Visibility)
+    }
+
+})(window);