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<h1 class="title">TweetsModel.qml Example File</h1>
<span class="subtitle">demos/tweetsearch/content/TweetsModel.qml</span>
<!-- $$$demos/tweetsearch/content/TweetsModel.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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  import QtQuick 2.0
  import &quot;tweetsearch.js&quot; as Helper

  <span class="type"><a href="qml-qtquick-item.html">Item</a></span> {
      <span class="name">id</span>: <span class="name">wrapper</span>

      <span class="comment">// Insert valid consumer key and secret tokens below</span>
      <span class="comment">// See https://dev.twitter.com/apps</span>
      property <span class="type">string</span> <span class="name">consumerKey</span> : <span class="string">&quot;&quot;</span>
      property <span class="type">string</span> <span class="name">consumerSecret</span> : <span class="string">&quot;&quot;</span>
      property <span class="type">string</span> <span class="name">bearerToken</span> : <span class="string">&quot;&quot;</span>

      property <span class="type">variant</span> <span class="name">model</span>: <span class="name">tweets</span>
      property <span class="type">string</span> <span class="name">from</span> : <span class="string">&quot;&quot;</span>
      property <span class="type">string</span> <span class="name">phrase</span> : <span class="string">&quot;&quot;</span>

      property <span class="type">int</span> <span class="name">status</span>: <span class="name">XMLHttpRequest</span>.<span class="name">UNSENT</span>
      property <span class="type">bool</span> <span class="name">isLoading</span>: <span class="name">status</span> <span class="operator">===</span> <span class="name">XMLHttpRequest</span>.<span class="name">LOADING</span>
      property <span class="type">bool</span> <span class="name">wasLoading</span>: <span class="number">false</span>
      signal <span class="type">isLoaded</span>

      <span class="type">ListModel</span> { <span class="name">id</span>: <span class="name">tweets</span> }

      <span class="keyword">function</span> <span class="name">encodePhrase</span>(<span class="name">x</span>) { <span class="keyword">return</span> <span class="name">encodeURIComponent</span>(<span class="name">x</span>); }

      <span class="keyword">function</span> <span class="name">reload</span>() {
          <span class="name">tweets</span>.<span class="name">clear</span>()

          <span class="keyword">if</span> (<span class="name">from</span> <span class="operator">==</span> <span class="string">&quot;&quot;</span> <span class="operator">&amp;&amp;</span> <span class="name">phrase</span> <span class="operator">==</span> <span class="string">&quot;&quot;</span>)
              <span class="keyword">return</span>;

          var <span class="name">req</span> = new <span class="name">XMLHttpRequest</span>;
          <span class="name">req</span>.<span class="name">open</span>(<span class="string">&quot;GET&quot;</span>, <span class="string">&quot;https://api.twitter.com/1.1/search/tweets.json?from=&quot;</span> <span class="operator">+</span> <span class="name">from</span> <span class="operator">+</span>
                          <span class="string">&quot;&amp;count=10&amp;q=&quot;</span> <span class="operator">+</span> <span class="name">encodePhrase</span>(<span class="name">phrase</span>));
          <span class="name">req</span>.<span class="name">setRequestHeader</span>(<span class="string">&quot;Authorization&quot;</span>, <span class="string">&quot;Bearer &quot;</span> <span class="operator">+</span> <span class="name">bearerToken</span>);
          <span class="name">req</span>.<span class="name">onreadystatechange</span> <span class="operator">=</span> <span class="keyword">function</span>() {
              <span class="name">status</span> <span class="operator">=</span> <span class="name">req</span>.<span class="name">readyState</span>;
              <span class="keyword">if</span> (<span class="name">status</span> <span class="operator">===</span> <span class="name">XMLHttpRequest</span>.<span class="name">DONE</span>) {
                  var <span class="name">objectArray</span> = <span class="name">JSON</span>.<span class="name">parse</span>(<span class="name">req</span>.<span class="name">responseText</span>);
                  <span class="keyword">if</span> (<span class="name">objectArray</span>.<span class="name">errors</span> <span class="operator">!==</span> <span class="name">undefined</span>)
                      <span class="name">console</span>.<span class="name">log</span>(<span class="string">&quot;Error fetching tweets: &quot;</span> <span class="operator">+</span> <span class="name">objectArray</span>.<span class="name">errors</span>[<span class="number">0</span>].<span class="name">message</span>)
                  <span class="keyword">else</span> {
                      <span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">key</span> in <span class="name">objectArray</span>.<span class="name">statuses</span>) {
                          var <span class="name">jsonObject</span> = <span class="name">objectArray</span>.<span class="name">statuses</span>[<span class="name">key</span>];
                          <span class="name">tweets</span>.<span class="name">append</span>(<span class="name">jsonObject</span>);
                      }
                  }
                  <span class="keyword">if</span> (<span class="name">wasLoading</span> <span class="operator">==</span> <span class="number">true</span>)
                      <span class="name">wrapper</span>.<span class="name">isLoaded</span>()
              }
              <span class="name">wasLoading</span> <span class="operator">=</span> (<span class="name">status</span> <span class="operator">===</span> <span class="name">XMLHttpRequest</span>.<span class="name">LOADING</span>);
          }
          <span class="name">req</span>.<span class="name">send</span>();
      }

      <span class="name">onPhraseChanged</span>: <span class="name">reload</span>();
      <span class="name">onFromChanged</span>: <span class="name">reload</span>();

      <span class="name">Component</span>.onCompleted: {
          <span class="keyword">if</span> (<span class="name">consumerKey</span> <span class="operator">===</span> <span class="string">&quot;&quot;</span> <span class="operator">||</span> <span class="name">consumerSecret</span> <span class="operator">==</span> <span class="string">&quot;&quot;</span>) {
              <span class="name">bearerToken</span> <span class="operator">=</span> <span class="name">encodeURIComponent</span>(<span class="name">Helper</span>.<span class="name">demoToken</span>())
              <span class="keyword">return</span>;
          }

          var <span class="name">authReq</span> = new <span class="name">XMLHttpRequest</span>;
          <span class="name">authReq</span>.<span class="name">open</span>(<span class="string">&quot;POST&quot;</span>, <span class="string">&quot;https://api.twitter.com/oauth2/token&quot;</span>);
          <span class="name">authReq</span>.<span class="name">setRequestHeader</span>(<span class="string">&quot;Content-Type&quot;</span>, <span class="string">&quot;application/x-www-form-urlencoded;charset=UTF-8&quot;</span>);
          <span class="name">authReq</span>.<span class="name">setRequestHeader</span>(<span class="string">&quot;Authorization&quot;</span>, <span class="string">&quot;Basic &quot;</span> <span class="operator">+</span> <span class="name">Qt</span>.<span class="name">btoa</span>(<span class="name">consumerKey</span> <span class="operator">+</span> <span class="string">&quot;:&quot;</span> <span class="operator">+</span> <span class="name">consumerSecret</span>));
          <span class="name">authReq</span>.<span class="name">onreadystatechange</span> <span class="operator">=</span> <span class="keyword">function</span>() {
              <span class="keyword">if</span> (<span class="name">authReq</span>.<span class="name">readyState</span> <span class="operator">===</span> <span class="name">XMLHttpRequest</span>.<span class="name">DONE</span>) {
                  var <span class="name">jsonResponse</span> = <span class="name">JSON</span>.<span class="name">parse</span>(<span class="name">authReq</span>.<span class="name">responseText</span>);
                  <span class="keyword">if</span> (<span class="name">jsonResponse</span>.<span class="name">errors</span> <span class="operator">!==</span> <span class="name">undefined</span>)
                      <span class="name">console</span>.<span class="name">log</span>(<span class="string">&quot;Authentication error: &quot;</span> <span class="operator">+</span> <span class="name">jsonResponse</span>.<span class="name">errors</span>[<span class="number">0</span>].<span class="name">message</span>)
                  <span class="keyword">else</span>
                      <span class="name">bearerToken</span> <span class="operator">=</span> <span class="name">jsonResponse</span>.<span class="name">access_token</span>;
              }
          }
          <span class="name">authReq</span>.<span class="name">send</span>(<span class="string">&quot;grant_type=client_credentials&quot;</span>);
      }

  }

</pre>
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<!-- @@@demos/tweetsearch/content/TweetsModel.qml -->
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