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gaia/apps/clock/js/connection/timer.js

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+define(function(require, exports) {
+'use strict';
+
+var Timer = require('timer');
+var parseDuration = require('ext/parse_duration');
+var port;
+var timer;
+
+exports.onstart = function(request) {
+  port = request.port;
+
+  window.addEventListener('timer-start', onTimerEvent);
+  window.addEventListener('timer-pause', onTimerEvent);
+  window.addEventListener('timer-end', onTimerEvent);
+  window.addEventListener('timer-tick', onTimerEvent);
+};
+
+exports.onclose = function() {
+  port = null;
+  timer = null;
+
+  window.removeEventListener('timer-start', onTimerEvent);
+  window.removeEventListener('timer-pause', onTimerEvent);
+  window.removeEventListener('timer-end', onTimerEvent);
+  window.removeEventListener('timer-tick', onTimerEvent);
+};
+
+function onTimerEvent(evt) {
+  if (!port) {
+    return;
+  }
+
+  port.postMessage({
+    type: evt.type,
+    remaining: evt.detail.remaining
+  });
+}
+
+exports.onmessage = function(event) {
+  if (timer) {
+    exec(event);
+  } else {
+    Timer.singleton((err, t) => {
+      timer = t;
+      exec(event);
+    });
+  }
+};
+
+function exec(event) {
+  var { type, duration } = event.data;
+  if (type === 'create') {
+    create(duration);
+    return;
+  }
+  // type: [start, pause, cancel]
+  timer[type]();
+  timer.commit();
+}
+
+function create(inputDuration) {
+  var duration = parseDuration(String(inputDuration));
+
+  if (!duration) {
+    port.postMessage({
+      error: `Invalid timer duration "${inputDuration}"`
+    });
+    return;
+  }
+
+  // we don't check the timer state since we assume the user wants to override
+  // any running timer and start it immediately
+  timer.duration = duration;
+  timer.start();
+  timer.commit();
+}
+
+});