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gaia/apps/sms/views/shared/js/time_headers.js

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+/*global Utils */
+(function(exports) {
+  'use strict';
+
+  var updateTimer = null;
+
+  var TimeHeaders = {
+    init: function th_init() {
+      onvisibilityChange();
+      document.addEventListener('visibilitychange', onvisibilityChange);
+      window.addEventListener('timeformatchange', ontimeFormatChange);
+      window.addEventListener('languagechange', onlanguageChange);
+    },
+    startScheduler: function th_startScheduler() {
+      var now = Date.now(),
+          nextTimeout = new Date(now + 60000);
+      nextTimeout.setSeconds(0);
+      nextTimeout.setMilliseconds(0);
+
+      // stop updateTimer first
+      this.stopScheduler();
+
+      // then register a new one
+      updateTimer = setTimeout(function() {
+        this.updateAll('header[data-time-update=repeat]');
+        this.startScheduler();
+      }.bind(this), nextTimeout.getTime() - now);
+    },
+    stopScheduler: function th_stopScheduler() {
+      clearTimeout(updateTimer);
+    },
+    updateAll: function th_updateAll(selector) {
+      selector = selector || '[data-time-update]';
+      var elements = document.querySelectorAll(selector),
+          length = elements.length,
+          i;
+
+      for (i = 0; i < length; i++) {
+        this.update(elements[i]);
+      }
+    },
+    update: function th_update(element) {
+      var ts = element.dataset.time;
+      if (!ts) {
+        return;
+      }
+
+      // only date
+      if (element.dataset.dateOnly === 'true') {
+        Utils.setHeaderDate({
+          time: ts,
+          element: element,
+          withTime: false
+        });
+
+      // only time
+      } else if (element.dataset.timeOnly === 'true') {
+        element.removeAttribute('data-l10n-id');
+        element.textContent = Utils.getFormattedHour(ts);
+
+      // date + time
+      } else {
+        Utils.setHeaderDate({
+          time: ts,
+          element: element,
+          withTime: true
+        });
+      }
+    }
+  };
+
+  function onvisibilityChange() {
+    if (document.hidden) {
+      TimeHeaders.stopScheduler();
+    }
+    else {
+      TimeHeaders.updateAll();
+      TimeHeaders.startScheduler();
+    }
+  }
+
+  function ontimeFormatChange() {
+    Utils.resetDateFormatters();
+    TimeHeaders.updateAll();
+  }
+
+  function onlanguageChange() {
+    Utils.resetDateFormatters();
+    TimeHeaders.updateAll();
+  }
+
+  exports.TimeHeaders = TimeHeaders;
+}(this));