<?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 Widgets 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="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-itemviews-chart-example.html">Chart Example</a></td><td >mainwindow.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtwidgets-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">itemviews/chart/mainwindow.cpp</span> <!-- $$$itemviews/chart/mainwindow.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: ** ** "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 "pieview.h"</span> <span class="preprocessor">#include "mainwindow.h"</span> <span class="preprocessor">#include <QtWidgets></span> MainWindow<span class="operator">::</span>MainWindow(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qmainwindow.html">QMainWindow</a></span>(parent) { <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>fileMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">"&File"</span>)<span class="operator">,</span> <span class="keyword">this</span>); <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>openAction <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Open..."</span>)); openAction<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="qaction.html">QAction</a></span> <span class="operator">*</span>saveAction <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Save As..."</span>)); saveAction<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>SaveAs); <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>quitAction <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"E&xit"</span>)); quitAction<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); setupModel(); setupViews(); connect(openAction<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>openFile); connect(saveAction<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>saveFile); connect(quitAction<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <a href="qapplication.html#qApp">qApp</a><span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>quit); menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(fileMenu); statusBar(); loadFile(<span class="string">":/Charts/qtdata.cht"</span>); setWindowTitle(tr(<span class="string">"Chart"</span>)); resize(<span class="number">870</span><span class="operator">,</span> <span class="number">550</span>); } <span class="type">void</span> MainWindow<span class="operator">::</span>setupModel() { model <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtgui/qstandarditemmodel.html">QStandardItemModel</a></span>(<span class="number">8</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="keyword">this</span>); model<span class="operator">-</span><span class="operator">></span>setHeaderData(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> tr(<span class="string">"Label"</span>)); model<span class="operator">-</span><span class="operator">></span>setHeaderData(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> tr(<span class="string">"Quantity"</span>)); } <span class="type">void</span> MainWindow<span class="operator">::</span>setupViews() { <span class="type"><a href="qsplitter.html">QSplitter</a></span> <span class="operator">*</span>splitter <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsplitter.html">QSplitter</a></span>; <span class="type"><a href="qtableview.html">QTableView</a></span> <span class="operator">*</span>table <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtableview.html">QTableView</a></span>; pieChart <span class="operator">=</span> <span class="keyword">new</span> PieView; splitter<span class="operator">-</span><span class="operator">></span>addWidget(table); splitter<span class="operator">-</span><span class="operator">></span>addWidget(pieChart); splitter<span class="operator">-</span><span class="operator">></span>setStretchFactor(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>); splitter<span class="operator">-</span><span class="operator">></span>setStretchFactor(<span class="number">1</span><span class="operator">,</span> <span class="number">1</span>); table<span class="operator">-</span><span class="operator">></span>setModel(model); pieChart<span class="operator">-</span><span class="operator">></span>setModel(model); <span class="type"><a href="../qtcore/qitemselectionmodel.html">QItemSelectionModel</a></span> <span class="operator">*</span>selectionModel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qitemselectionmodel.html">QItemSelectionModel</a></span>(model); table<span class="operator">-</span><span class="operator">></span>setSelectionModel(selectionModel); pieChart<span class="operator">-</span><span class="operator">></span>setSelectionModel(selectionModel); <span class="type"><a href="qheaderview.html">QHeaderView</a></span> <span class="operator">*</span>headerView <span class="operator">=</span> table<span class="operator">-</span><span class="operator">></span>horizontalHeader(); headerView<span class="operator">-</span><span class="operator">></span>setStretchLastSection(<span class="keyword">true</span>); setCentralWidget(splitter); } <span class="type">void</span> MainWindow<span class="operator">::</span>openFile() { <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getOpenFileName(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Choose a data file"</span>)<span class="operator">,</span> <span class="string">""</span><span class="operator">,</span> <span class="string">"*.cht"</span>); <span class="keyword">if</span> (<span class="operator">!</span>fileName<span class="operator">.</span>isEmpty()) loadFile(fileName); } <span class="type">void</span> MainWindow<span class="operator">::</span>loadFile(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fileName) { <span class="type"><a href="../qtcore/qfile.html">QFile</a></span> file(fileName); <span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">.</span>open(<span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>ReadOnly <span class="operator">|</span> <span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>Text)) <span class="keyword">return</span>; <span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> stream(<span class="operator">&</span>file); model<span class="operator">-</span><span class="operator">></span>removeRows(<span class="number">0</span><span class="operator">,</span> model<span class="operator">-</span><span class="operator">></span>rowCount(<span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>()); <span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">while</span> (<span class="operator">!</span>stream<span class="operator">.</span>atEnd()) { <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> line <span class="operator">=</span> stream<span class="operator">.</span>readLine(); <span class="keyword">if</span> (<span class="operator">!</span>line<span class="operator">.</span>isEmpty()) { model<span class="operator">-</span><span class="operator">></span>insertRows(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>()); <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> pieces <span class="operator">=</span> line<span class="operator">.</span>split(<span class="char">','</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>SkipEmptyParts); <span class="keyword">if</span> (pieces<span class="operator">.</span>size() <span class="operator"><</span> <span class="number">3</span>) <span class="keyword">continue</span>; model<span class="operator">-</span><span class="operator">></span>setData(model<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span> pieces<span class="operator">.</span>value(<span class="number">0</span>)); model<span class="operator">-</span><span class="operator">></span>setData(model<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span> pieces<span class="operator">.</span>value(<span class="number">1</span>)); model<span class="operator">-</span><span class="operator">></span>setData(model<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(pieces<span class="operator">.</span>value(<span class="number">2</span>))<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DecorationRole); row<span class="operator">+</span><span class="operator">+</span>; } }; file<span class="operator">.</span>close(); statusBar()<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"Loaded %1"</span>)<span class="operator">.</span>arg(fileName)<span class="operator">,</span> <span class="number">2000</span>); } <span class="type">void</span> MainWindow<span class="operator">::</span>saveFile() { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getSaveFileName(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Save file as"</span>)<span class="operator">,</span> <span class="string">""</span><span class="operator">,</span> <span class="string">"*.cht"</span>); <span class="keyword">if</span> (fileName<span class="operator">.</span>isEmpty()) <span class="keyword">return</span>; <span class="type"><a href="../qtcore/qfile.html">QFile</a></span> file(fileName); <span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">.</span>open(<span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>WriteOnly <span class="operator">|</span> <span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>Text)) <span class="keyword">return</span>; <span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> stream(<span class="operator">&</span>file); <span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator"><</span> model<span class="operator">-</span><span class="operator">></span>rowCount(<span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>()); <span class="operator">+</span><span class="operator">+</span>row) { <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> pieces; pieces<span class="operator">.</span>append(model<span class="operator">-</span><span class="operator">></span>data(model<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DisplayRole)<span class="operator">.</span>toString()); pieces<span class="operator">.</span>append(model<span class="operator">-</span><span class="operator">></span>data(model<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DisplayRole)<span class="operator">.</span>toString()); pieces<span class="operator">.</span>append(model<span class="operator">-</span><span class="operator">></span>data(model<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DecorationRole)<span class="operator">.</span>toString()); stream <span class="operator"><</span><span class="operator"><</span> pieces<span class="operator">.</span>join(<span class="char">','</span>) <span class="operator"><</span><span class="operator"><</span> <span class="string">"\n"</span>; } file<span class="operator">.</span>close(); statusBar()<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"Saved %1"</span>)<span class="operator">.</span>arg(fileName)<span class="operator">,</span> <span class="number">2000</span>); } </pre> </div> <!-- @@@itemviews/chart/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>