<?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-editabletreemodel-example.html">Editable Tree Model 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/editabletreemodel/mainwindow.cpp</span> <!-- $$$itemviews/editabletreemodel/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 "mainwindow.h"</span> <span class="preprocessor">#include "treemodel.h"</span> <span class="preprocessor">#include <QFile></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) { setupUi(<span class="keyword">this</span>); <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> headers; headers <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Title"</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Description"</span>); <span class="type"><a href="../qtcore/qfile.html">QFile</a></span> file(<span class="string">":/default.txt"</span>); file<span class="operator">.</span>open(<span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly); TreeModel <span class="operator">*</span>model <span class="operator">=</span> <span class="keyword">new</span> TreeModel(headers<span class="operator">,</span> file<span class="operator">.</span>readAll()); file<span class="operator">.</span>close(); view<span class="operator">-</span><span class="operator">></span>setModel(model); <span class="keyword">for</span> (<span class="type">int</span> column <span class="operator">=</span> <span class="number">0</span>; column <span class="operator"><</span> model<span class="operator">-</span><span class="operator">></span>columnCount(); <span class="operator">+</span><span class="operator">+</span>column) view<span class="operator">-</span><span class="operator">></span>resizeColumnToContents(column); connect(exitAction<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); connect(view<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtcore/qitemselectionmodel.html">QItemSelectionModel</a></span><span class="operator">::</span>selectionChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>updateActions); connect(actionsMenu<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmenu.html">QMenu</a></span><span class="operator">::</span>aboutToShow<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>updateActions); connect(insertRowAction<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>insertRow); connect(insertColumnAction<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>insertColumn); connect(removeRowAction<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>removeRow); connect(removeColumnAction<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>removeColumn); connect(insertChildAction<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>insertChild); updateActions(); } <span class="type">void</span> MainWindow<span class="operator">::</span>insertChild() { <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> view<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></span>currentIndex(); <span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>model <span class="operator">=</span> view<span class="operator">-</span><span class="operator">></span>model(); <span class="keyword">if</span> (model<span class="operator">-</span><span class="operator">></span>columnCount(index) <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) { <span class="keyword">if</span> (<span class="operator">!</span>model<span class="operator">-</span><span class="operator">></span>insertColumn(<span class="number">0</span><span class="operator">,</span> index)) <span class="keyword">return</span>; } <span class="keyword">if</span> (<span class="operator">!</span>model<span class="operator">-</span><span class="operator">></span>insertRow(<span class="number">0</span><span class="operator">,</span> index)) <span class="keyword">return</span>; <span class="keyword">for</span> (<span class="type">int</span> column <span class="operator">=</span> <span class="number">0</span>; column <span class="operator"><</span> model<span class="operator">-</span><span class="operator">></span>columnCount(index); <span class="operator">+</span><span class="operator">+</span>column) { <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> child <span class="operator">=</span> model<span class="operator">-</span><span class="operator">></span>index(<span class="number">0</span><span class="operator">,</span> column<span class="operator">,</span> index); model<span class="operator">-</span><span class="operator">></span>setData(child<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(<span class="string">"[No data]"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>EditRole); <span class="keyword">if</span> (<span class="operator">!</span>model<span class="operator">-</span><span class="operator">></span>headerData(column<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal)<span class="operator">.</span>isValid()) model<span class="operator">-</span><span class="operator">></span>setHeaderData(column<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(<span class="string">"[No header]"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>EditRole); } view<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></span>setCurrentIndex(model<span class="operator">-</span><span class="operator">></span>index(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> index)<span class="operator">,</span> <span class="type"><a href="../qtcore/qitemselectionmodel.html">QItemSelectionModel</a></span><span class="operator">::</span>ClearAndSelect); updateActions(); } bool MainWindow<span class="operator">::</span>insertColumn() { <span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>model <span class="operator">=</span> view<span class="operator">-</span><span class="operator">></span>model(); <span class="type">int</span> column <span class="operator">=</span> view<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></span>currentIndex()<span class="operator">.</span>column(); <span class="comment">// Insert a column in the parent item.</span> bool changed <span class="operator">=</span> model<span class="operator">-</span><span class="operator">></span>insertColumn(column <span class="operator">+</span> <span class="number">1</span>); <span class="keyword">if</span> (changed) model<span class="operator">-</span><span class="operator">></span>setHeaderData(column <span class="operator">+</span> <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> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(<span class="string">"[No header]"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>EditRole); updateActions(); <span class="keyword">return</span> changed; } <span class="type">void</span> MainWindow<span class="operator">::</span>insertRow() { <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> view<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></span>currentIndex(); <span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>model <span class="operator">=</span> view<span class="operator">-</span><span class="operator">></span>model(); <span class="keyword">if</span> (<span class="operator">!</span>model<span class="operator">-</span><span class="operator">></span>insertRow(index<span class="operator">.</span>row()<span class="operator">+</span><span class="number">1</span><span class="operator">,</span> index<span class="operator">.</span>parent())) <span class="keyword">return</span>; updateActions(); <span class="keyword">for</span> (<span class="type">int</span> column <span class="operator">=</span> <span class="number">0</span>; column <span class="operator"><</span> model<span class="operator">-</span><span class="operator">></span>columnCount(index<span class="operator">.</span>parent()); <span class="operator">+</span><span class="operator">+</span>column) { <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> child <span class="operator">=</span> model<span class="operator">-</span><span class="operator">></span>index(index<span class="operator">.</span>row()<span class="operator">+</span><span class="number">1</span><span class="operator">,</span> column<span class="operator">,</span> index<span class="operator">.</span>parent()); model<span class="operator">-</span><span class="operator">></span>setData(child<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(<span class="string">"[No data]"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>EditRole); } } bool MainWindow<span class="operator">::</span>removeColumn() { <span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>model <span class="operator">=</span> view<span class="operator">-</span><span class="operator">></span>model(); <span class="type">int</span> column <span class="operator">=</span> view<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></span>currentIndex()<span class="operator">.</span>column(); <span class="comment">// Insert columns in each child of the parent item.</span> bool changed <span class="operator">=</span> model<span class="operator">-</span><span class="operator">></span>removeColumn(column); <span class="keyword">if</span> (changed) updateActions(); <span class="keyword">return</span> changed; } <span class="type">void</span> MainWindow<span class="operator">::</span>removeRow() { <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> view<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></span>currentIndex(); <span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>model <span class="operator">=</span> view<span class="operator">-</span><span class="operator">></span>model(); <span class="keyword">if</span> (model<span class="operator">-</span><span class="operator">></span>removeRow(index<span class="operator">.</span>row()<span class="operator">,</span> index<span class="operator">.</span>parent())) updateActions(); } <span class="type">void</span> MainWindow<span class="operator">::</span>updateActions() { bool hasSelection <span class="operator">=</span> <span class="operator">!</span>view<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></span>selection()<span class="operator">.</span>isEmpty(); removeRowAction<span class="operator">-</span><span class="operator">></span>setEnabled(hasSelection); removeColumnAction<span class="operator">-</span><span class="operator">></span>setEnabled(hasSelection); bool hasCurrent <span class="operator">=</span> view<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></span>currentIndex()<span class="operator">.</span>isValid(); insertRowAction<span class="operator">-</span><span class="operator">></span>setEnabled(hasCurrent); insertColumnAction<span class="operator">-</span><span class="operator">></span>setEnabled(hasCurrent); <span class="keyword">if</span> (hasCurrent) { view<span class="operator">-</span><span class="operator">></span>closePersistentEditor(view<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></span>currentIndex()); <span class="type">int</span> row <span class="operator">=</span> view<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></span>currentIndex()<span class="operator">.</span>row(); <span class="type">int</span> column <span class="operator">=</span> view<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></span>currentIndex()<span class="operator">.</span>column(); <span class="keyword">if</span> (view<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></span>currentIndex()<span class="operator">.</span>parent()<span class="operator">.</span>isValid()) statusBar()<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"Position: (%1,%2)"</span>)<span class="operator">.</span>arg(row)<span class="operator">.</span>arg(column)); <span class="keyword">else</span> statusBar()<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"Position: (%1,%2) in top level"</span>)<span class="operator">.</span>arg(row)<span class="operator">.</span>arg(column)); } } </pre> </div> <!-- @@@itemviews/editabletreemodel/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>