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<h1 class="title">chat.cpp Example File</h1>
<span class="subtitle">chat/chat.cpp</span>
<!-- $$$chat/chat.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
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  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** 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 &lt;QApplication&gt;</span>
  <span class="preprocessor">#include &lt;QMessageBox&gt;</span>

  <span class="preprocessor">#include &quot;chat.h&quot;</span>
  <span class="preprocessor">#include &quot;chat_adaptor.h&quot;</span>
  <span class="preprocessor">#include &quot;chat_interface.h&quot;</span>

  ChatMainWindow<span class="operator">::</span>ChatMainWindow()
      : m_nickname(QLatin1String(<span class="string">&quot;nickname&quot;</span>))
  {
      setupUi(<span class="keyword">this</span>);
      sendButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);

      connect(messageLineEdit<span class="operator">,</span> SIGNAL(textChanged(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(textChangedSlot(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>)));
      connect(sendButton<span class="operator">,</span> SIGNAL(clicked(bool))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(sendClickedSlot()));
      connect(actionChangeNickname<span class="operator">,</span> SIGNAL(triggered(bool))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(changeNickname()));
      connect(actionAboutQt<span class="operator">,</span> SIGNAL(triggered(bool))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(aboutQt()));
      connect(qApp<span class="operator">,</span> SIGNAL(lastWindowClosed())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(exiting()));

      <span class="comment">// add our D-Bus interface and connect to D-Bus</span>
      <span class="keyword">new</span> ChatAdaptor(<span class="keyword">this</span>);
      <span class="type"><a href="qdbusconnection.html">QDBusConnection</a></span><span class="operator">::</span>sessionBus()<span class="operator">.</span>registerObject(<span class="string">&quot;/&quot;</span><span class="operator">,</span> <span class="keyword">this</span>);

      org<span class="operator">::</span>example<span class="operator">::</span>chat <span class="operator">*</span>iface;
      iface <span class="operator">=</span> <span class="keyword">new</span> org<span class="operator">::</span>example<span class="operator">::</span>chat(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>()<span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>()<span class="operator">,</span> <span class="type"><a href="qdbusconnection.html">QDBusConnection</a></span><span class="operator">::</span>sessionBus()<span class="operator">,</span> <span class="keyword">this</span>);
      <span class="comment">//connect(iface, SIGNAL(message(QString,QString)), this, SLOT(messageSlot(QString,QString)));</span>
      <span class="type"><a href="qdbusconnection.html">QDBusConnection</a></span><span class="operator">::</span>sessionBus()<span class="operator">.</span>connect(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>()<span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>()<span class="operator">,</span> <span class="string">&quot;org.example.chat&quot;</span><span class="operator">,</span> <span class="string">&quot;message&quot;</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(messageSlot(<span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">,</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span>)));
      connect(iface<span class="operator">,</span> SIGNAL(action(<span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">,</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(actionSlot(<span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">,</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span>)));

      NicknameDialog dialog;
      dialog<span class="operator">.</span>cancelButton<span class="operator">-</span><span class="operator">&gt;</span>setVisible(<span class="keyword">false</span>);
      dialog<span class="operator">.</span>exec();
      m_nickname <span class="operator">=</span> dialog<span class="operator">.</span>nickname<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">.</span>trimmed();
      <span class="keyword">emit</span> action(m_nickname<span class="operator">,</span> QLatin1String(<span class="string">&quot;joins the chat&quot;</span>));
  }

  ChatMainWindow<span class="operator">::</span><span class="operator">~</span>ChatMainWindow()
  {
  }

  <span class="type">void</span> ChatMainWindow<span class="operator">::</span>rebuildHistory()
  {
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> history <span class="operator">=</span> m_messages<span class="operator">.</span>join( QLatin1String(<span class="string">&quot;\n&quot;</span> ) );
      chatHistory<span class="operator">-</span><span class="operator">&gt;</span>setPlainText(history);
  }

  <span class="type">void</span> ChatMainWindow<span class="operator">::</span>messageSlot(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>nickname<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>text)
  {
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> msg( QLatin1String(<span class="string">&quot;&lt;%1&gt; %2&quot;</span>) );
      msg <span class="operator">=</span> msg<span class="operator">.</span>arg(nickname<span class="operator">,</span> text);
      m_messages<span class="operator">.</span>append(msg);

      <span class="keyword">if</span> (m_messages<span class="operator">.</span>count() <span class="operator">&gt;</span> <span class="number">100</span>)
          m_messages<span class="operator">.</span>removeFirst();
      rebuildHistory();
  }

  <span class="type">void</span> ChatMainWindow<span class="operator">::</span>actionSlot(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>nickname<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>text)
  {
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> msg( QLatin1String(<span class="string">&quot;* %1 %2&quot;</span>) );
      msg <span class="operator">=</span> msg<span class="operator">.</span>arg(nickname<span class="operator">,</span> text);
      m_messages<span class="operator">.</span>append(msg);

      <span class="keyword">if</span> (m_messages<span class="operator">.</span>count() <span class="operator">&gt;</span> <span class="number">100</span>)
          m_messages<span class="operator">.</span>removeFirst();
      rebuildHistory();
  }

  <span class="type">void</span> ChatMainWindow<span class="operator">::</span>textChangedSlot(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>newText)
  {
      sendButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="operator">!</span>newText<span class="operator">.</span>isEmpty());
  }

  <span class="type">void</span> ChatMainWindow<span class="operator">::</span>sendClickedSlot()
  {
      <span class="comment">//emit message(m_nickname, messageLineEdit-&gt;text());</span>
      <span class="type"><a href="qdbusmessage.html">QDBusMessage</a></span> msg <span class="operator">=</span> <span class="type"><a href="qdbusmessage.html">QDBusMessage</a></span><span class="operator">::</span>createSignal(<span class="string">&quot;/&quot;</span><span class="operator">,</span> <span class="string">&quot;org.example.chat&quot;</span><span class="operator">,</span> <span class="string">&quot;message&quot;</span>);
      msg <span class="operator">&lt;</span><span class="operator">&lt;</span> m_nickname <span class="operator">&lt;</span><span class="operator">&lt;</span> messageLineEdit<span class="operator">-</span><span class="operator">&gt;</span>text();
      <span class="type"><a href="qdbusconnection.html">QDBusConnection</a></span><span class="operator">::</span>sessionBus()<span class="operator">.</span>send(msg);
      messageLineEdit<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>());
  }

  <span class="type">void</span> ChatMainWindow<span class="operator">::</span>changeNickname()
  {
      NicknameDialog dialog(<span class="keyword">this</span>);
      <span class="keyword">if</span> (dialog<span class="operator">.</span>exec() <span class="operator">=</span><span class="operator">=</span> <span class="type">QDialog</span><span class="operator">::</span>Accepted) {
          <span class="type"><a href="../qtcore/qstring.html">QString</a></span> old <span class="operator">=</span> m_nickname;
          m_nickname <span class="operator">=</span> dialog<span class="operator">.</span>nickname<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">.</span>trimmed();
          <span class="keyword">emit</span> action(old<span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">&quot;is now known as %1&quot;</span>)<span class="operator">.</span>arg(m_nickname));
      }
  }

  <span class="type">void</span> ChatMainWindow<span class="operator">::</span>aboutQt()
  {
      <span class="type">QMessageBox</span><span class="operator">::</span>aboutQt(<span class="keyword">this</span>);
  }

  <span class="type">void</span> ChatMainWindow<span class="operator">::</span>exiting()
  {
      <span class="keyword">emit</span> action(m_nickname<span class="operator">,</span> QLatin1String(<span class="string">&quot;leaves the chat&quot;</span>));
  }

  NicknameDialog<span class="operator">::</span>NicknameDialog(<span class="type">QWidget</span> <span class="operator">*</span>parent)
      : <span class="type">QDialog</span>(parent)
  {
      setupUi(<span class="keyword">this</span>);
  }

  <span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">*</span>argv)
  {
      <span class="type">QApplication</span> app(argc<span class="operator">,</span> argv);

      <span class="keyword">if</span> (<span class="operator">!</span><span class="type"><a href="qdbusconnection.html">QDBusConnection</a></span><span class="operator">::</span>sessionBus()<span class="operator">.</span>isConnected()) {
          <a href="../qtcore/qtglobal.html#qWarning">qWarning</a>(<span class="string">&quot;Cannot connect to the D-Bus session bus.\n&quot;</span>
                   <span class="string">&quot;Please check your system settings and try again.\n&quot;</span>);
          <span class="keyword">return</span> <span class="number">1</span>;
      }

      ChatMainWindow chat;
      chat<span class="operator">.</span>show();
      <span class="keyword">return</span> app<span class="operator">.</span>exec();
  }

</pre>
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<!-- @@@chat/chat.cpp -->
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