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<h1 class="title">StockModel.qml Example File</h1>
<span class="subtitle">demos/stocqt/content/StockModel.qml</span>
<!-- $$$demos/stocqt/content/StockModel.qml-description -->
<div class="descr"> <a name="details"></a>
<pre class="qml">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2017 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
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  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
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  ** met:
  **   * Redistributions of source code must retain the above copyright
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  import QtQuick 2.0

  <span class="type">ListModel</span> {
      <span class="name">id</span>: <span class="name">model</span>
      property <span class="type">string</span> <span class="name">stockId</span>: <span class="string">&quot;&quot;</span>
      property <span class="type">string</span> <span class="name">stockName</span>: <span class="string">&quot;&quot;</span>
      property <span class="type">string</span> <span class="name">stockDataCycle</span>: <span class="string">&quot;d&quot;</span>
      property <span class="type">bool</span> <span class="name">ready</span>: <span class="number">false</span>
      property <span class="type">real</span> <span class="name">stockPrice</span>: <span class="number">0.0</span>
      property <span class="type">real</span> <span class="name">stockPriceChanged</span>: <span class="number">0.0</span>

      signal <span class="type">dataReady</span>

      <span class="keyword">function</span> <span class="name">indexOf</span>(<span class="name">date</span>) {
          <span class="keyword">if</span> (<span class="name">model</span>.<span class="name">count</span> <span class="operator">==</span> <span class="number">0</span>)
              <span class="keyword">return</span> -<span class="number">1</span>;

          var <span class="name">newest</span> = new <span class="name">Date</span>(<span class="name">model</span>.<span class="name">get</span>(<span class="number">0</span>).<span class="name">date</span>);
          var <span class="name">oldest</span> = new <span class="name">Date</span>(<span class="name">model</span>.<span class="name">get</span>(<span class="name">model</span>.<span class="name">count</span> <span class="operator">-</span> <span class="number">1</span>).<span class="name">date</span>);
          <span class="keyword">if</span> (<span class="name">newest</span> <span class="operator">&lt;=</span> <span class="name">date</span>)
              <span class="keyword">return</span> -<span class="number">1</span>;

          <span class="keyword">if</span> (<span class="name">oldest</span> <span class="operator">&gt;=</span> <span class="name">date</span>)
              <span class="keyword">return</span> <span class="name">model</span>.<span class="name">count</span> <span class="operator">-</span> <span class="number">1</span>;

          var <span class="name">currDiff</span> = <span class="number">0</span>;
          var <span class="name">bestDiff</span> = <span class="name">Math</span>.<span class="name">abs</span>(<span class="name">date</span>.<span class="name">getTime</span>() <span class="operator">-</span> <span class="name">newest</span>.<span class="name">getTime</span>());
          var <span class="name">retval</span> = <span class="number">0</span>;
          <span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">i</span> = <span class="number">0</span>; <span class="name">i</span> <span class="operator">&lt;</span> <span class="name">model</span>.<span class="name">count</span>; i++) {
              var <span class="name">d</span> = new <span class="name">Date</span>(<span class="name">model</span>.<span class="name">get</span>(<span class="name">i</span>).<span class="name">date</span>);
              <span class="name">currDiff</span> <span class="operator">=</span> <span class="name">Math</span>.<span class="name">abs</span>(<span class="name">d</span>.<span class="name">getTime</span>() <span class="operator">-</span> <span class="name">date</span>.<span class="name">getTime</span>());
              <span class="keyword">if</span> (<span class="name">currDiff</span> <span class="operator">&lt;</span> <span class="name">bestDiff</span>) {
                  <span class="name">bestDiff</span> <span class="operator">=</span> <span class="name">currDiff</span>;
                  <span class="name">retval</span> <span class="operator">=</span> <span class="name">i</span>;
              }
              <span class="keyword">if</span> (<span class="name">currDiff</span> <span class="operator">&gt;</span> <span class="name">bestDiff</span>)
                  <span class="keyword">return</span> <span class="name">retval</span>;
          }

          <span class="keyword">return</span> -<span class="number">1</span>;
      }

      <span class="keyword">function</span> <span class="name">requestUrl</span>() {
          <span class="keyword">if</span> (<span class="name">stockId</span> <span class="operator">===</span> <span class="string">&quot;&quot;</span>)
              <span class="keyword">return</span>;

          var <span class="name">startDate</span> = new <span class="name">Date</span>(<span class="number">2011</span>, <span class="number">4</span>, <span class="number">25</span>);

          var <span class="name">endDate</span> = new <span class="name">Date</span>(); <span class="comment">//today</span>

          <span class="keyword">if</span> (<span class="name">stockDataCycle</span> <span class="operator">!==</span> <span class="string">&quot;d&quot;</span> <span class="operator">&amp;&amp;</span> <span class="name">stockDataCycle</span> <span class="operator">!==</span> <span class="string">&quot;w&quot;</span> <span class="operator">&amp;&amp;</span> <span class="name">stockDataCycle</span> <span class="operator">!==</span> <span class="string">&quot;m&quot;</span>)
              <span class="name">stockDataCycle</span> <span class="operator">=</span> <span class="string">&quot;d&quot;</span>;

          <span class="comment">/*
              Fetch stock data from yahoo finance:
               url: http://ichart.finance.yahoo.com/table.csv?s=NOK&amp;a=5&amp;b=11&amp;c=2010&amp;d=7&amp;e=23&amp;f=2010&amp;g=d&amp;ignore=.csv
                  s:stock name/id, a:start day, b:start month, c:start year  default: 25 April 1995, oldest c= 1962
                  d:end day, e:end month, f:end year, default:today  (data only available 3 days before today)
                  g:data cycle(d daily,  w weekly, m monthly, v Dividend)
            */</span>
          var <span class="name">request</span> = <span class="string">&quot;http://ichart.finance.yahoo.com/table.csv?&quot;</span>;
          <span class="name">request</span> <span class="operator">+=</span> <span class="string">&quot;s=&quot;</span> <span class="operator">+</span> <span class="name">stockId</span>;
          <span class="name">request</span> <span class="operator">+=</span> <span class="string">&quot;&amp;a=&quot;</span> <span class="operator">+</span> <span class="name">startDate</span>.<span class="name">getMonth</span>();
          <span class="name">request</span> <span class="operator">+=</span> <span class="string">&quot;&amp;b=&quot;</span> <span class="operator">+</span> <span class="name">startDate</span>.<span class="name">getDate</span>();
          <span class="name">request</span> <span class="operator">+=</span> <span class="string">&quot;&amp;c=&quot;</span> <span class="operator">+</span> <span class="name">startDate</span>.<span class="name">getFullYear</span>();
          <span class="name">request</span> <span class="operator">+=</span> <span class="string">&quot;&amp;d=&quot;</span> <span class="operator">+</span> <span class="name">endDate</span>.<span class="name">getMonth</span>();
          <span class="name">request</span> <span class="operator">+=</span> <span class="string">&quot;&amp;e=&quot;</span> <span class="operator">+</span> <span class="name">endDate</span>.<span class="name">getDate</span>();
          <span class="name">request</span> <span class="operator">+=</span> <span class="string">&quot;&amp;f=&quot;</span> <span class="operator">+</span> <span class="name">endDate</span>.<span class="name">getFullYear</span>();
          <span class="name">request</span> <span class="operator">+=</span> <span class="string">&quot;&amp;g=&quot;</span> <span class="operator">+</span> <span class="name">stockDataCycle</span>;
          <span class="name">request</span> <span class="operator">+=</span> <span class="string">&quot;&amp;ignore=.csv&quot;</span>;
          <span class="keyword">return</span> <span class="name">request</span>;
      }

      <span class="keyword">function</span> <span class="name">createStockPrice</span>(<span class="name">r</span>) {
          <span class="keyword">return</span> {
                  &quot;date&quot;: <span class="name">r</span>[<span class="number">0</span>],
                  &quot;open&quot;:<span class="name">r</span>[<span class="number">1</span>],
                  &quot;high&quot;:<span class="name">r</span>[<span class="number">2</span>],
                  &quot;low&quot;:<span class="name">r</span>[<span class="number">3</span>],
                  &quot;close&quot;:<span class="name">r</span>[<span class="number">4</span>],
                  &quot;volume&quot;:<span class="name">r</span>[<span class="number">5</span>],
                  &quot;adjusted&quot;:<span class="name">r</span>[<span class="number">6</span>]
                 };
      }

      <span class="keyword">function</span> <span class="name">updateStock</span>() {
          var <span class="name">req</span> = <span class="name">requestUrl</span>();

          <span class="keyword">if</span> (!<span class="name">req</span>)
              <span class="keyword">return</span>;

          var <span class="name">xhr</span> = new <span class="name">XMLHttpRequest</span>;

          <span class="name">xhr</span>.<span class="name">open</span>(<span class="string">&quot;GET&quot;</span>, <span class="name">req</span>, <span class="number">true</span>);

          <span class="name">model</span>.<span class="name">ready</span> <span class="operator">=</span> <span class="number">false</span>;
          <span class="name">model</span>.<span class="name">clear</span>();
          var <span class="name">i</span> = <span class="number">1</span>; <span class="comment">//skip the first line</span>
          <span class="name">xhr</span>.<span class="name">onreadystatechange</span> <span class="operator">=</span> <span class="keyword">function</span>() {
              <span class="keyword">if</span> (<span class="name">xhr</span>.<span class="name">readyState</span> <span class="operator">===</span> <span class="name">XMLHttpRequest</span>.<span class="name">LOADING</span> <span class="operator">||</span> <span class="name">xhr</span>.<span class="name">readyState</span> <span class="operator">===</span> <span class="name">XMLHttpRequest</span>.<span class="name">DONE</span>) {
                  var <span class="name">records</span> = <span class="name">xhr</span>.<span class="name">responseText</span>.<span class="name">split</span>(<span class="string">'\n'</span>);

                  <span class="keyword">for</span> (;<span class="name">i</span> <span class="operator">&lt;</span> <span class="name">records</span>.<span class="name">length</span>; i++ ) {
                      var <span class="name">r</span> = <span class="name">records</span>[<span class="name">i</span>].<span class="name">split</span>(<span class="string">','</span>);
                      <span class="keyword">if</span> (<span class="name">r</span>.<span class="name">length</span> <span class="operator">===</span> <span class="number">7</span>)
                          <span class="name">model</span>.<span class="name">append</span>(<span class="name">createStockPrice</span>(<span class="name">r</span>));
                  }

                  <span class="keyword">if</span> (<span class="name">xhr</span>.<span class="name">readyState</span> <span class="operator">===</span> <span class="name">XMLHttpRequest</span>.<span class="name">DONE</span>) {
                      <span class="keyword">if</span> (<span class="name">model</span>.<span class="name">count</span> <span class="operator">&gt;</span> <span class="number">0</span>) {
                          <span class="name">model</span>.<span class="name">ready</span> <span class="operator">=</span> <span class="number">true</span>;
                          <span class="name">model</span>.<span class="name">stockPrice</span> <span class="operator">=</span> <span class="name">model</span>.<span class="name">get</span>(<span class="number">0</span>).<span class="name">adjusted</span>;
                          <span class="name">model</span>.<span class="name">stockPriceChanged</span> <span class="operator">=</span> <span class="name">model</span>.<span class="name">count</span> <span class="operator">&gt;</span> <span class="number">1</span> ? (<span class="name">Math</span>.<span class="name">round</span>((<span class="name">model</span>.<span class="name">stockPrice</span> <span class="operator">-</span> <span class="name">model</span>.<span class="name">get</span>(<span class="number">1</span>).<span class="name">close</span>) <span class="operator">*</span> <span class="number">100</span>) <span class="operator">/</span> <span class="number">100</span>) : <span class="number">0</span>;
                      } <span class="keyword">else</span> {
                          <span class="name">model</span>.<span class="name">stockPrice</span> <span class="operator">=</span> <span class="number">0</span>;
                          <span class="name">model</span>.<span class="name">stockPriceChanged</span> <span class="operator">=</span> <span class="number">0</span>;
                      }
                      <span class="name">model</span>.<span class="name">dataReady</span>(); <span class="comment">// emit signal - model.ready indicates whether the data is valid</span>
                  }
              }
          }
          <span class="name">xhr</span>.<span class="name">send</span>()
      }
  }

</pre>
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<!-- @@@demos/stocqt/content/StockModel.qml -->
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