<!DOCTYPE html>
<!--
Copyright (c) 2015 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<link rel="import" href="/base/base.html">
<link rel="import" href="/base/event_target.html">

<script>
'use strict';

/**
 * @fileoverview Time currentDisplayUnit
 */
tr.exportTo('tr.b.units', function() {
  var ms = {
    suffix: 'ms',
    format: function(ts) {
      var tsRounded = Math.round(ts * 1000.0) / 1000.0;
      var n = new Number(tsRounded);
      return n.toLocaleString(undefined, { minimumFractionDigits: 3 }) + ' ms';
    }
  };

  var ns = {
    suffix: 'ns',
    format: function(ts) {
      var tsRounded = Math.round(ts * 1000000.0);
      var n = new Number(tsRounded);
      return n.toLocaleString(undefined, { maximumFractionDigits: 0 }) + ' ns';
    }
  };

  var Time = {
    supportedUnits: {
      ms: ms,
      ns: ns
    },

    reset: function() {
      this.currentDisplayUnit = ms;
    },

    currentDisplayUnit_: ms,
    get currentDisplayUnit() {
      return this.currentDisplayUnit_;
    },
    set currentDisplayUnit(value) {
      if (this.currentDisplayUnit_ == value)
        return;

      this.currentDisplayUnit_ = value;
      this.dispatchEvent(new Event('display-unit-changed'));
    }
  };

  tr.b.EventTarget.decorate(Time);

  return {
    Time: Time
  };
});
</script>