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<h1 class="title">googlesuggest.cpp Example File</h1>
<span class="subtitle">googlesuggest/googlesuggest.cpp</span>
<!-- $$$googlesuggest/googlesuggest.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 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
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
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  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
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  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;googlesuggest.h&quot;</span>

  <span class="preprocessor">#define GSUGGEST_URL &quot;http://google.com/complete/search?output=toolbar&amp;q=%1&quot;</span>

  GSuggestCompletion<span class="operator">::</span>GSuggestCompletion(<span class="type">QLineEdit</span> <span class="operator">*</span>parent): <span class="type"><a href="../qtcore/qobject.html">QObject</a></span>(parent)<span class="operator">,</span> editor(parent)
  {
      popup <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QTreeWidget</span>;
      popup<span class="operator">-</span><span class="operator">&gt;</span>setWindowFlags(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Popup);
      popup<span class="operator">-</span><span class="operator">&gt;</span>setFocusPolicy(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoFocus);
      popup<span class="operator">-</span><span class="operator">&gt;</span>setFocusProxy(parent);
      popup<span class="operator">-</span><span class="operator">&gt;</span>setMouseTracking(<span class="keyword">true</span>);

      popup<span class="operator">-</span><span class="operator">&gt;</span>setColumnCount(<span class="number">1</span>);
      popup<span class="operator">-</span><span class="operator">&gt;</span>setUniformRowHeights(<span class="keyword">true</span>);
      popup<span class="operator">-</span><span class="operator">&gt;</span>setRootIsDecorated(<span class="keyword">false</span>);
      popup<span class="operator">-</span><span class="operator">&gt;</span>setEditTriggers(<span class="type">QTreeWidget</span><span class="operator">::</span>NoEditTriggers);
      popup<span class="operator">-</span><span class="operator">&gt;</span>setSelectionBehavior(<span class="type">QTreeWidget</span><span class="operator">::</span>SelectRows);
      popup<span class="operator">-</span><span class="operator">&gt;</span>setFrameStyle(<span class="type">QFrame</span><span class="operator">::</span>Box <span class="operator">|</span> <span class="type">QFrame</span><span class="operator">::</span>Plain);
      popup<span class="operator">-</span><span class="operator">&gt;</span>setHorizontalScrollBarPolicy(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ScrollBarAlwaysOff);
      popup<span class="operator">-</span><span class="operator">&gt;</span>header()<span class="operator">-</span><span class="operator">&gt;</span>hide();

      popup<span class="operator">-</span><span class="operator">&gt;</span>installEventFilter(<span class="keyword">this</span>);

      connect(popup<span class="operator">,</span> SIGNAL(itemClicked(<span class="type">QTreeWidgetItem</span><span class="operator">*</span><span class="operator">,</span><span class="type">int</span>))<span class="operator">,</span>
              SLOT(doneCompletion()));

      timer <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qtimer.html">QTimer</a></span>(<span class="keyword">this</span>);
      timer<span class="operator">-</span><span class="operator">&gt;</span>setSingleShot(<span class="keyword">true</span>);
      timer<span class="operator">-</span><span class="operator">&gt;</span>setInterval(<span class="number">500</span>);
      connect(timer<span class="operator">,</span> SIGNAL(timeout())<span class="operator">,</span> SLOT(autoSuggest()));
      connect(editor<span class="operator">,</span> SIGNAL(textEdited(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span> timer<span class="operator">,</span> SLOT(start()));

      connect(<span class="operator">&amp;</span>networkManager<span class="operator">,</span> SIGNAL(finished(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span><span class="operator">*</span>))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(handleNetworkData(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span><span class="operator">*</span>)));

  }

  GSuggestCompletion<span class="operator">::</span><span class="operator">~</span>GSuggestCompletion()
  {
      <span class="keyword">delete</span> popup;
  }

  bool GSuggestCompletion<span class="operator">::</span>eventFilter(<span class="type"><a href="../qtcore/qobject.html">QObject</a></span> <span class="operator">*</span>obj<span class="operator">,</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> <span class="operator">*</span>ev)
  {
      <span class="keyword">if</span> (obj <span class="operator">!</span><span class="operator">=</span> popup)
          <span class="keyword">return</span> <span class="keyword">false</span>;

      <span class="keyword">if</span> (ev<span class="operator">-</span><span class="operator">&gt;</span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonPress) {
          popup<span class="operator">-</span><span class="operator">&gt;</span>hide();
          editor<span class="operator">-</span><span class="operator">&gt;</span>setFocus();
          <span class="keyword">return</span> <span class="keyword">true</span>;
      }

      <span class="keyword">if</span> (ev<span class="operator">-</span><span class="operator">&gt;</span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>KeyPress) {

          bool consumed <span class="operator">=</span> <span class="keyword">false</span>;
          <span class="type">int</span> key <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type"><a href="../qtgui/qkeyevent.html">QKeyEvent</a></span><span class="operator">*</span><span class="operator">&gt;</span>(ev)<span class="operator">-</span><span class="operator">&gt;</span>key();
          <span class="keyword">switch</span> (key) {
          <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Enter:
          <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Return:
              doneCompletion();
              consumed <span class="operator">=</span> <span class="keyword">true</span>;
              <span class="keyword">break</span>;

          <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Escape:
              editor<span class="operator">-</span><span class="operator">&gt;</span>setFocus();
              popup<span class="operator">-</span><span class="operator">&gt;</span>hide();
              consumed <span class="operator">=</span> <span class="keyword">true</span>;
              <span class="keyword">break</span>;

          <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Up:
          <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Down:
          <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Home:
          <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_End:
          <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_PageUp:
          <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_PageDown:
              <span class="keyword">break</span>;

          <span class="keyword">default</span>:
              editor<span class="operator">-</span><span class="operator">&gt;</span>setFocus();
              editor<span class="operator">-</span><span class="operator">&gt;</span>event(ev);
              popup<span class="operator">-</span><span class="operator">&gt;</span>hide();
              <span class="keyword">break</span>;
          }

          <span class="keyword">return</span> consumed;
      }

      <span class="keyword">return</span> <span class="keyword">false</span>;
  }

  <span class="type">void</span> GSuggestCompletion<span class="operator">::</span>showCompletion(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> <span class="operator">&amp;</span>choices)
  {

      <span class="keyword">if</span> (choices<span class="operator">.</span>isEmpty())
          <span class="keyword">return</span>;

      <span class="keyword">const</span> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span> <span class="operator">&amp;</span>pal <span class="operator">=</span> editor<span class="operator">-</span><span class="operator">&gt;</span>palette();
      <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> color <span class="operator">=</span> pal<span class="operator">.</span>color(<span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Disabled<span class="operator">,</span> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>WindowText);

      popup<span class="operator">-</span><span class="operator">&gt;</span>setUpdatesEnabled(<span class="keyword">false</span>);
      popup<span class="operator">-</span><span class="operator">&gt;</span>clear();
      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> choices<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i) {
          <span class="type">QTreeWidgetItem</span> <span class="operator">*</span> item;
          item <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QTreeWidgetItem</span>(popup);
          item<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="number">0</span><span class="operator">,</span> choices<span class="operator">[</span>i<span class="operator">]</span>);
          item<span class="operator">-</span><span class="operator">&gt;</span>setTextColor(<span class="number">0</span><span class="operator">,</span> color);
      }
      popup<span class="operator">-</span><span class="operator">&gt;</span>setCurrentItem(popup<span class="operator">-</span><span class="operator">&gt;</span>topLevelItem(<span class="number">0</span>));
      popup<span class="operator">-</span><span class="operator">&gt;</span>resizeColumnToContents(<span class="number">0</span>);
      popup<span class="operator">-</span><span class="operator">&gt;</span>setUpdatesEnabled(<span class="keyword">true</span>);

      popup<span class="operator">-</span><span class="operator">&gt;</span>move(editor<span class="operator">-</span><span class="operator">&gt;</span>mapToGlobal(<span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> editor<span class="operator">-</span><span class="operator">&gt;</span>height())));
      popup<span class="operator">-</span><span class="operator">&gt;</span>setFocus();
      popup<span class="operator">-</span><span class="operator">&gt;</span>show();
  }

  <span class="type">void</span> GSuggestCompletion<span class="operator">::</span>doneCompletion()
  {
      timer<span class="operator">-</span><span class="operator">&gt;</span>stop();
      popup<span class="operator">-</span><span class="operator">&gt;</span>hide();
      editor<span class="operator">-</span><span class="operator">&gt;</span>setFocus();
      <span class="type">QTreeWidgetItem</span> <span class="operator">*</span>item <span class="operator">=</span> popup<span class="operator">-</span><span class="operator">&gt;</span>currentItem();
      <span class="keyword">if</span> (item) {
          editor<span class="operator">-</span><span class="operator">&gt;</span>setText(item<span class="operator">-</span><span class="operator">&gt;</span>text(<span class="number">0</span>));
          <span class="type"><a href="../qtcore/qmetaobject.html">QMetaObject</a></span><span class="operator">::</span>invokeMethod(editor<span class="operator">,</span> <span class="string">&quot;returnPressed&quot;</span>);
      }
  }

  <span class="type">void</span> GSuggestCompletion<span class="operator">::</span>autoSuggest()
  {
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> str <span class="operator">=</span> editor<span class="operator">-</span><span class="operator">&gt;</span>text();
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> url <span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(GSUGGEST_URL)<span class="operator">.</span>arg(str);
      networkManager<span class="operator">.</span>get(<span class="type"><a href="qnetworkrequest.html">QNetworkRequest</a></span>(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(url)));
  }

  <span class="type">void</span> GSuggestCompletion<span class="operator">::</span>preventSuggest()
  {
      timer<span class="operator">-</span><span class="operator">&gt;</span>stop();
  }

  <span class="type">void</span> GSuggestCompletion<span class="operator">::</span>handleNetworkData(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span> <span class="operator">*</span>networkReply)
  {
      <span class="type"><a href="../qtcore/qurl.html">QUrl</a></span> url <span class="operator">=</span> networkReply<span class="operator">-</span><span class="operator">&gt;</span>url();
      <span class="keyword">if</span> (<span class="operator">!</span>networkReply<span class="operator">-</span><span class="operator">&gt;</span>error()) {
          <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> choices;

          <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> response(networkReply<span class="operator">-</span><span class="operator">&gt;</span>readAll());
          <span class="type"><a href="../qtcore/qxmlstreamreader.html">QXmlStreamReader</a></span> xml(response);
          <span class="keyword">while</span> (<span class="operator">!</span>xml<span class="operator">.</span>atEnd()) {
              xml<span class="operator">.</span>readNext();
              <span class="keyword">if</span> (xml<span class="operator">.</span>tokenType() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qxmlstreamreader.html">QXmlStreamReader</a></span><span class="operator">::</span>StartElement)
                  <span class="keyword">if</span> (xml<span class="operator">.</span>name() <span class="operator">=</span><span class="operator">=</span> <span class="string">&quot;suggestion&quot;</span>) {
                      <span class="type"><a href="../qtcore/qstringref.html">QStringRef</a></span> str <span class="operator">=</span> xml<span class="operator">.</span>attributes()<span class="operator">.</span>value(<span class="string">&quot;data&quot;</span>);
                      choices <span class="operator">&lt;</span><span class="operator">&lt;</span> str<span class="operator">.</span>toString();
                  }
          }

          showCompletion(choices);
      }

      networkReply<span class="operator">-</span><span class="operator">&gt;</span>deleteLater();
  }

</pre>
</div>
<!-- @@@googlesuggest/googlesuggest.cpp -->
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