<?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 5.12.2</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 5.12.2 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: ** ** "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 ** "AS IS" 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include "mainwindow.h"</span> <span class="preprocessor">#include "mimetypemodel.h"</span> <span class="preprocessor">#include <QAction></span> <span class="preprocessor">#include <QApplication></span> <span class="preprocessor">#include <QFileDialog></span> <span class="preprocessor">#include <QInputDialog></span> <span class="preprocessor">#include <QMenu></span> <span class="preprocessor">#include <QMenuBar></span> <span class="preprocessor">#include <QMessageBox></span> <span class="preprocessor">#include <QPlainTextEdit></span> <span class="preprocessor">#include <QSplitter></span> <span class="preprocessor">#include <QStatusBar></span> <span class="preprocessor">#include <QTextEdit></span> <span class="preprocessor">#include <QTreeView></span> <span class="preprocessor">#include <QFileInfo></span> <span class="preprocessor">#include <QItemSelectionModel></span> <span class="preprocessor">#include <QMimeDatabase></span> <span class="preprocessor">#include <QMimeType></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">"Qt Mime Database Browser"</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">></span>addMenu(tr(<span class="string">"&File"</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">></span>addAction(tr(<span class="string">"&Detect File Type..."</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>detectFile); detectFileAction<span class="operator">-</span><span class="operator">></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">></span>addAction(tr(<span class="string">"E&xit"</span>)<span class="operator">,</span> <a href="../qtwidgets/qapplication.html#qApp">qApp</a><span class="operator">,</span> <span class="operator">&</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">></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">></span>addMenu(tr(<span class="string">"&Edit"</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">></span>addAction(tr(<span class="string">"&Find..."</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>find); findAction<span class="operator">-</span><span class="operator">></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">></span>addAction(tr(<span class="string">"Find &Next"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>findNext); m_findNextAction<span class="operator">-</span><span class="operator">></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">></span>addAction(tr(<span class="string">"Find &Previous"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>findPrevious); m_findPreviousAction<span class="operator">-</span><span class="operator">></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">></span>addMenu(tr(<span class="string">"&About"</span>))<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&About Qt"</span>)<span class="operator">,</span> <a href="../qtwidgets/qapplication.html#qApp">qApp</a><span class="operator">,</span> <span class="operator">&</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">></span>setUniformRowHeights(<span class="keyword">true</span>); m_treeView<span class="operator">-</span><span class="operator">></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">></span>findItems(<span class="string">"application/octet-stream"</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">></span>expand(m_model<span class="operator">-</span><span class="operator">></span>indexFromItem(items<span class="operator">.</span>constFirst())); connect(m_treeView<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">,</span> <span class="operator">&</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">&</span>MainWindow<span class="operator">::</span>currentChanged); centralSplitter<span class="operator">-</span><span class="operator">></span>addWidget(m_treeView); m_detailsText<span class="operator">-</span><span class="operator">></span>setReadOnly(<span class="keyword">true</span>); centralSplitter<span class="operator">-</span><span class="operator">></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">&</span>index) { <span class="keyword">if</span> (index<span class="operator">.</span>isValid()) m_detailsText<span class="operator">-</span><span class="operator">></span>setText(MimetypeModel<span class="operator">::</span>formatMimeTypeInfo(m_model<span class="operator">-</span><span class="operator">></span>mimeType(index))); <span class="keyword">else</span> m_detailsText<span class="operator">-</span><span class="operator">></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">&</span>index) { m_treeView<span class="operator">-</span><span class="operator">></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">></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">"Choose File"</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">></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">></span>showMessage(tr(<span class="string">"\"%1\" is of type \"%2\""</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">"Unknown File Type"</span>)<span class="operator">,</span> tr(<span class="string">"The type of %1 could not be determined."</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">></span> <span class="number">1</span>; m_findNextAction<span class="operator">-</span><span class="operator">></span>setEnabled(findNextPreviousEnabled); m_findPreviousAction<span class="operator">-</span><span class="operator">></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"><</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">></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">></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"><</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">"Find"</span>)); inputDialog<span class="operator">.</span>setLabelText(tr(<span class="string">"Text:"</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">></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">></span>indexFromItem(item)); statusBar()<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"%n mime types match \"%1\"."</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">©</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>