Sophie: qtbase5-doc-5.12.6-2.mga7 noarch

qtbase5-doc-5.12.6-2.mga7.noarch.rpm

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>mainwindow.cpp Example File | Qt Core 5.12.6</title>
  <link rel="stylesheet" type="text/css" href="style/offline-simple.css" />
  <script type="text/javascript">
    document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css");
    // loading style sheet breaks anchors that were jumped to before
    // so force jumping to anchor again
    setTimeout(function() {
        var anchor = location.hash;
        // need to jump to different anchor first (e.g. none)
        location.hash = "#";
        setTimeout(function() {
            location.hash = anchor;
        }, 0);
    }, 0);
  </script>
</head>
<body>
<div class="header" id="qtdocheader">
  <div class="main">
    <div class="main-rounded">
      <div class="navigationbar">
        <table><tr>
<td >Qt 5.12</td><td ><a href="qtcore-index.html">Qt Core</a></td><td ><a href="qtcore-mimetypes-mimetypebrowser-example.html">MIME Type Browser Example</a></td><td >mainwindow.cpp Example File</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtcore-index.html">Qt 5.12.6 Reference Documentation</a></td>
        </tr></table>
      </div>
    </div>
<div class="content">
<div class="line">
<div class="content mainContent">
<div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">mainwindow.cpp Example File</h1>
<span class="subtitle">mimetypes/mimetypebrowser/mainwindow.cpp</span>
<!-- $$$mimetypes/mimetypebrowser/mainwindow.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2017 The Qt Company Ltd.
  ** Contact: http://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
  **     distribution.
  **   * 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.
  **
  **
  ** 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,
  ** 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 &quot;mainwindow.h&quot;</span>
  <span class="preprocessor">#include &quot;mimetypemodel.h&quot;</span>

  <span class="preprocessor">#include &lt;QAction&gt;</span>
  <span class="preprocessor">#include &lt;QApplication&gt;</span>
  <span class="preprocessor">#include &lt;QFileDialog&gt;</span>
  <span class="preprocessor">#include &lt;QInputDialog&gt;</span>
  <span class="preprocessor">#include &lt;QMenu&gt;</span>
  <span class="preprocessor">#include &lt;QMenuBar&gt;</span>
  <span class="preprocessor">#include &lt;QMessageBox&gt;</span>
  <span class="preprocessor">#include &lt;QPlainTextEdit&gt;</span>
  <span class="preprocessor">#include &lt;QSplitter&gt;</span>
  <span class="preprocessor">#include &lt;QStatusBar&gt;</span>
  <span class="preprocessor">#include &lt;QTextEdit&gt;</span>
  <span class="preprocessor">#include &lt;QTreeView&gt;</span>

  <span class="preprocessor">#include &lt;QFileInfo&gt;</span>
  <span class="preprocessor">#include &lt;QItemSelectionModel&gt;</span>
  <span class="preprocessor">#include &lt;QMimeDatabase&gt;</span>
  <span class="preprocessor">#include &lt;QMimeType&gt;</span>

  MainWindow<span class="operator">::</span>MainWindow(<span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
      : <span class="type"><a href="../qtwidgets/qmainwindow.html">QMainWindow</a></span>(parent)
      <span class="operator">,</span> m_model(<span class="keyword">new</span> MimetypeModel(<span class="keyword">this</span>))
      <span class="operator">,</span> m_treeView(<span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qtreeview.html">QTreeView</a></span>(<span class="keyword">this</span>))
      <span class="operator">,</span> m_detailsText(<span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qtextedit.html">QTextEdit</a></span>(<span class="keyword">this</span>))
      <span class="operator">,</span> m_findIndex(<span class="number">0</span>)
  {
      setWindowTitle(tr(<span class="string">&quot;Qt Mime Database Browser&quot;</span>));

      <span class="type"><a href="../qtwidgets/qmenu.html">QMenu</a></span> <span class="operator">*</span>fileMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;File&quot;</span>));
      <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span> <span class="operator">*</span>detectFileAction <span class="operator">=</span>
          fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;&amp;Detect File Type...&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWindow<span class="operator">::</span>detectFile);
      detectFileAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Open);

      <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span> <span class="operator">*</span>exitAction <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;E&amp;xit&quot;</span>)<span class="operator">,</span> <a href="../qtwidgets/qapplication.html#qApp">qApp</a><span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="../qtwidgets/qapplication.html">QApplication</a></span><span class="operator">::</span>closeAllWindows);
      exitAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Quit);

      <span class="type"><a href="../qtwidgets/qmenu.html">QMenu</a></span> <span class="operator">*</span>findMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;Edit&quot;</span>));
      <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span> <span class="operator">*</span>findAction <span class="operator">=</span>
          findMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;&amp;Find...&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWindow<span class="operator">::</span>find);
      findAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Find);
      m_findNextAction <span class="operator">=</span> findMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;Find &amp;Next&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWindow<span class="operator">::</span>findNext);
      m_findNextAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>FindNext);
      m_findPreviousAction <span class="operator">=</span> findMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;Find &amp;Previous&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWindow<span class="operator">::</span>findPrevious);
      m_findPreviousAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>FindPrevious);

      menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;About&quot;</span>))<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;&amp;About Qt&quot;</span>)<span class="operator">,</span> <a href="../qtwidgets/qapplication.html#qApp">qApp</a><span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="../qtwidgets/qapplication.html">QApplication</a></span><span class="operator">::</span>aboutQt);

      <span class="type"><a href="../qtwidgets/qsplitter.html">QSplitter</a></span> <span class="operator">*</span>centralSplitter <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qsplitter.html">QSplitter</a></span>(<span class="keyword">this</span>);
      setCentralWidget(centralSplitter);
      m_treeView<span class="operator">-</span><span class="operator">&gt;</span>setUniformRowHeights(<span class="keyword">true</span>);
      m_treeView<span class="operator">-</span><span class="operator">&gt;</span>setModel(m_model);

      <span class="keyword">const</span> <span class="keyword">auto</span> items <span class="operator">=</span> m_model<span class="operator">-</span><span class="operator">&gt;</span>findItems(<span class="string">&quot;application/octet-stream&quot;</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>MatchContains <span class="operator">|</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>MatchFixedString <span class="operator">|</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>MatchRecursive);
      <span class="keyword">if</span> (<span class="operator">!</span>items<span class="operator">.</span>isEmpty())
          m_treeView<span class="operator">-</span><span class="operator">&gt;</span>expand(m_model<span class="operator">-</span><span class="operator">&gt;</span>indexFromItem(items<span class="operator">.</span>constFirst()));

      connect(m_treeView<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qitemselectionmodel.html">QItemSelectionModel</a></span><span class="operator">::</span>currentChanged<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWindow<span class="operator">::</span>currentChanged);
      centralSplitter<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_treeView);
      m_detailsText<span class="operator">-</span><span class="operator">&gt;</span>setReadOnly(<span class="keyword">true</span>);
      centralSplitter<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_detailsText);

      updateFindActions();
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>currentChanged(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&amp;</span>index)
  {
      <span class="keyword">if</span> (index<span class="operator">.</span>isValid())
          m_detailsText<span class="operator">-</span><span class="operator">&gt;</span>setText(MimetypeModel<span class="operator">::</span>formatMimeTypeInfo(m_model<span class="operator">-</span><span class="operator">&gt;</span>mimeType(index)));
      <span class="keyword">else</span>
          m_detailsText<span class="operator">-</span><span class="operator">&gt;</span>clear();
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>selectAndGoTo(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&amp;</span>index)
  {
      m_treeView<span class="operator">-</span><span class="operator">&gt;</span>scrollTo(index<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>PositionAtCenter);
      m_treeView<span class="operator">-</span><span class="operator">&gt;</span>setCurrentIndex(index);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>detectFile()
  {
      <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="../qtwidgets/qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getOpenFileName(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Choose File&quot;</span>));
      <span class="keyword">if</span> (fileName<span class="operator">.</span>isEmpty())
          <span class="keyword">return</span>;
      <span class="type"><a href="qmimedatabase.html">QMimeDatabase</a></span> mimeDatabase;
      <span class="keyword">const</span> <span class="type"><a href="qfileinfo.html">QFileInfo</a></span> fi(fileName);
      <span class="keyword">const</span> <span class="type"><a href="qmimetype.html">QMimeType</a></span> mimeType <span class="operator">=</span> mimeDatabase<span class="operator">.</span>mimeTypeForFile(fi);
      <span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> mimeType<span class="operator">.</span>isValid()
          <span class="operator">?</span> m_model<span class="operator">-</span><span class="operator">&gt;</span>indexForMimeType(mimeType<span class="operator">.</span>name()) : <span class="type"><a href="qmodelindex.html">QModelIndex</a></span>();
      <span class="keyword">if</span> (index<span class="operator">.</span>isValid()) {
          statusBar()<span class="operator">-</span><span class="operator">&gt;</span>showMessage(tr(<span class="string">&quot;\&quot;%1\&quot; is of type \&quot;%2\&quot;&quot;</span>)<span class="operator">.</span>arg(fi<span class="operator">.</span>fileName()<span class="operator">,</span> mimeType<span class="operator">.</span>name()));
          selectAndGoTo(index);
      } <span class="keyword">else</span> {
          <span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Unknown File Type&quot;</span>)<span class="operator">,</span>
                                   tr(<span class="string">&quot;The type of %1 could not be determined.&quot;</span>)
                                   <span class="operator">.</span>arg(<span class="type"><a href="qdir.html">QDir</a></span><span class="operator">::</span>toNativeSeparators(fileName)));
      }
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>updateFindActions()
  {
      <span class="keyword">const</span> bool findNextPreviousEnabled <span class="operator">=</span> m_findMatches<span class="operator">.</span>size() <span class="operator">&gt;</span> <span class="number">1</span>;
      m_findNextAction<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(findNextPreviousEnabled);
      m_findPreviousAction<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(findNextPreviousEnabled);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>findPrevious()
  {
      <span class="keyword">if</span> (<span class="operator">-</span><span class="operator">-</span>m_findIndex <span class="operator">&lt;</span> <span class="number">0</span>)
          m_findIndex <span class="operator">=</span> m_findMatches<span class="operator">.</span>size() <span class="operator">-</span> <span class="number">1</span>;
      <span class="keyword">if</span> (m_findIndex <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">0</span>)
          selectAndGoTo(m_findMatches<span class="operator">.</span>at(m_findIndex));
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>findNext()
  {
      <span class="keyword">if</span> (<span class="operator">+</span><span class="operator">+</span>m_findIndex <span class="operator">&gt;</span><span class="operator">=</span> m_findMatches<span class="operator">.</span>size())
          m_findIndex <span class="operator">=</span> <span class="number">0</span>;
      <span class="keyword">if</span> (m_findIndex <span class="operator">&lt;</span> m_findMatches<span class="operator">.</span>size())
          selectAndGoTo(m_findMatches<span class="operator">.</span>at(m_findIndex));
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>find()
  {
      <span class="type"><a href="../qtwidgets/qinputdialog.html">QInputDialog</a></span> inputDialog(<span class="keyword">this</span>);
      inputDialog<span class="operator">.</span>setWindowTitle(tr(<span class="string">&quot;Find&quot;</span>));
      inputDialog<span class="operator">.</span>setLabelText(tr(<span class="string">&quot;Text:&quot;</span>));
      <span class="keyword">if</span> (inputDialog<span class="operator">.</span>exec() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtwidgets/qdialog.html">QDialog</a></span><span class="operator">::</span>Accepted)
          <span class="keyword">return</span>;
      <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> value <span class="operator">=</span> inputDialog<span class="operator">.</span>textValue()<span class="operator">.</span>trimmed();
      <span class="keyword">if</span> (value<span class="operator">.</span>isEmpty())
          <span class="keyword">return</span>;

      m_findMatches<span class="operator">.</span>clear();
      m_findIndex <span class="operator">=</span> <span class="number">0</span>;
      foreach (<span class="keyword">const</span> <span class="type"><a href="../qtgui/qstandarditem.html">QStandardItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> m_model<span class="operator">-</span><span class="operator">&gt;</span>findItems(value<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>MatchContains <span class="operator">|</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>MatchFixedString <span class="operator">|</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>MatchRecursive))
          m_findMatches<span class="operator">.</span>append(m_model<span class="operator">-</span><span class="operator">&gt;</span>indexFromItem(item));
      statusBar()<span class="operator">-</span><span class="operator">&gt;</span>showMessage(tr(<span class="string">&quot;%n mime types match \&quot;%1\&quot;.&quot;</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> m_findMatches<span class="operator">.</span>size())<span class="operator">.</span>arg(value));
      updateFindActions();
      <span class="keyword">if</span> (<span class="operator">!</span>m_findMatches<span class="operator">.</span>isEmpty())
          selectAndGoTo(m_findMatches<span class="operator">.</span>constFirst());
  }

</pre>
</div>
<!-- @@@mimetypes/mimetypebrowser/mainwindow.cpp -->
        </div>
       </div>
   </div>
   </div>
</div>
<div class="footer">
   <p>
   <acronym title="Copyright">&copy;</acronym> 2019 The Qt Company Ltd.
   Documentation contributions included herein are the copyrights of
   their respective owners.<br/>    The documentation provided herein is licensed under the terms of the    <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation    License version 1.3</a> as published by the Free Software Foundation.<br/>    Qt and respective logos are trademarks of The Qt Company Ltd.     in Finland and/or other countries worldwide. All other trademarks are property
   of their respective owners. </p>
</div>
</body>
</html>