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gaia/apps/system/js/telephony_monitor.js

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+/* global BaseModule */
+'use strict';
+
+(function() {
+  var TelephonyMonitor = function(telephony) {
+    this.telephony = telephony;
+  };
+  TelephonyMonitor.STATES = [
+    'inCall',
+    'hasActiveCall'
+  ];
+  BaseModule.create(TelephonyMonitor, {
+    name: 'TelephonyMonitor',
+    inCall: false,
+    /**
+     * Check if there is active call
+     * @param  {Number}  index If not specified, it means any active call;
+     *         if specified, it means the active call at this SIM slot.
+     * @return {Boolean} There is active call or not.
+     */
+    hasActiveCall: function(index) {
+      if (index) {
+        return this.telephony.active &&
+               this.telephony.active.serviceId === index;
+      } else {
+        return !!this.telephony.active;
+      }
+    },
+    handleEvent: function(evt) {
+      this.inCall = this.telephony.calls.length > 0;
+      this.publish('callschanged', {
+        detail: evt.detail
+      });
+    },
+    _start: function() {
+      this.telephony.addEventListener('callschanged', this);
+    },
+    _stop: function() {
+      this.telephony.removeEventListener('callschanged', this);
+    }
+  });
+}());