<?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>treemodel.cpp Example File | Qt Widgets 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="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-itemviews-editabletreemodel-example.html">Editable Tree Model Example</a></td><td >treemodel.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtwidgets-index.html">Qt 5.12.6 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">treemodel.cpp Example File</h1> <span class="subtitle">itemviews/editabletreemodel/treemodel.cpp</span> <!-- $$$itemviews/editabletreemodel/treemodel.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 <QtWidgets></span> <span class="preprocessor">#include "treeitem.h"</span> <span class="preprocessor">#include "treemodel.h"</span> TreeModel<span class="operator">::</span>TreeModel(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> <span class="operator">&</span>headers<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>data<span class="operator">,</span> <span class="type"><a href="../qtcore/qobject.html">QObject</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span>(parent) { <span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">></span> rootData; foreach (<span class="type"><a href="../qtcore/qstring.html">QString</a></span> header<span class="operator">,</span> headers) rootData <span class="operator"><</span><span class="operator"><</span> header; rootItem <span class="operator">=</span> <span class="keyword">new</span> TreeItem(rootData); setupModelData(data<span class="operator">.</span>split(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"\n"</span>))<span class="operator">,</span> rootItem); } TreeModel<span class="operator">::</span><span class="operator">~</span>TreeModel() { <span class="keyword">delete</span> rootItem; } <span class="type">int</span> TreeModel<span class="operator">::</span>columnCount(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span> <span class="comment">/* parent */</span>) <span class="keyword">const</span> { <span class="keyword">return</span> rootItem<span class="operator">-</span><span class="operator">></span>columnCount(); } <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> TreeModel<span class="operator">::</span>data(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index<span class="operator">,</span> <span class="type">int</span> role) <span class="keyword">const</span> { <span class="keyword">if</span> (<span class="operator">!</span>index<span class="operator">.</span>isValid()) <span class="keyword">return</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(); <span class="keyword">if</span> (role <span class="operator">!</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><span class="operator">&</span> role <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>EditRole) <span class="keyword">return</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(); TreeItem <span class="operator">*</span>item <span class="operator">=</span> getItem(index); <span class="keyword">return</span> item<span class="operator">-</span><span class="operator">></span>data(index<span class="operator">.</span>column()); } <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ItemFlags TreeModel<span class="operator">::</span>flags(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index) <span class="keyword">const</span> { <span class="keyword">if</span> (<span class="operator">!</span>index<span class="operator">.</span>isValid()) <span class="keyword">return</span> <span class="number">0</span>; <span class="keyword">return</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ItemIsEditable <span class="operator">|</span> <span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span><span class="operator">::</span>flags(index); } TreeItem <span class="operator">*</span>TreeModel<span class="operator">::</span>getItem(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index) <span class="keyword">const</span> { <span class="keyword">if</span> (index<span class="operator">.</span>isValid()) { TreeItem <span class="operator">*</span>item <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span>TreeItem<span class="operator">*</span><span class="operator">></span>(index<span class="operator">.</span>internalPointer()); <span class="keyword">if</span> (item) <span class="keyword">return</span> item; } <span class="keyword">return</span> rootItem; } <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> TreeModel<span class="operator">::</span>headerData(<span class="type">int</span> section<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Orientation orientation<span class="operator">,</span> <span class="type">int</span> role) <span class="keyword">const</span> { <span class="keyword">if</span> (orientation <span class="operator">=</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="operator">&</span> role <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DisplayRole) <span class="keyword">return</span> rootItem<span class="operator">-</span><span class="operator">></span>data(section); <span class="keyword">return</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(); } <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> TreeModel<span class="operator">::</span>index(<span class="type">int</span> row<span class="operator">,</span> <span class="type">int</span> column<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>parent) <span class="keyword">const</span> { <span class="keyword">if</span> (parent<span class="operator">.</span>isValid() <span class="operator">&</span><span class="operator">&</span> parent<span class="operator">.</span>column() <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>) <span class="keyword">return</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>(); TreeItem <span class="operator">*</span>parentItem <span class="operator">=</span> getItem(parent); TreeItem <span class="operator">*</span>childItem <span class="operator">=</span> parentItem<span class="operator">-</span><span class="operator">></span>child(row); <span class="keyword">if</span> (childItem) <span class="keyword">return</span> createIndex(row<span class="operator">,</span> column<span class="operator">,</span> childItem); <span class="keyword">else</span> <span class="keyword">return</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>(); } bool TreeModel<span class="operator">::</span>insertColumns(<span class="type">int</span> position<span class="operator">,</span> <span class="type">int</span> columns<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>parent) { bool success; beginInsertColumns(parent<span class="operator">,</span> position<span class="operator">,</span> position <span class="operator">+</span> columns <span class="operator">-</span> <span class="number">1</span>); success <span class="operator">=</span> rootItem<span class="operator">-</span><span class="operator">></span>insertColumns(position<span class="operator">,</span> columns); endInsertColumns(); <span class="keyword">return</span> success; } bool TreeModel<span class="operator">::</span>insertRows(<span class="type">int</span> position<span class="operator">,</span> <span class="type">int</span> rows<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>parent) { TreeItem <span class="operator">*</span>parentItem <span class="operator">=</span> getItem(parent); bool success; beginInsertRows(parent<span class="operator">,</span> position<span class="operator">,</span> position <span class="operator">+</span> rows <span class="operator">-</span> <span class="number">1</span>); success <span class="operator">=</span> parentItem<span class="operator">-</span><span class="operator">></span>insertChildren(position<span class="operator">,</span> rows<span class="operator">,</span> rootItem<span class="operator">-</span><span class="operator">></span>columnCount()); endInsertRows(); <span class="keyword">return</span> success; } <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> TreeModel<span class="operator">::</span>parent(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index) <span class="keyword">const</span> { <span class="keyword">if</span> (<span class="operator">!</span>index<span class="operator">.</span>isValid()) <span class="keyword">return</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>(); TreeItem <span class="operator">*</span>childItem <span class="operator">=</span> getItem(index); TreeItem <span class="operator">*</span>parentItem <span class="operator">=</span> childItem<span class="operator">-</span><span class="operator">></span>parent(); <span class="keyword">if</span> (parentItem <span class="operator">=</span><span class="operator">=</span> rootItem) <span class="keyword">return</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>(); <span class="keyword">return</span> createIndex(parentItem<span class="operator">-</span><span class="operator">></span>childNumber()<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> parentItem); } bool TreeModel<span class="operator">::</span>removeColumns(<span class="type">int</span> position<span class="operator">,</span> <span class="type">int</span> columns<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>parent) { bool success; beginRemoveColumns(parent<span class="operator">,</span> position<span class="operator">,</span> position <span class="operator">+</span> columns <span class="operator">-</span> <span class="number">1</span>); success <span class="operator">=</span> rootItem<span class="operator">-</span><span class="operator">></span>removeColumns(position<span class="operator">,</span> columns); endRemoveColumns(); <span class="keyword">if</span> (rootItem<span class="operator">-</span><span class="operator">></span>columnCount() <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) removeRows(<span class="number">0</span><span class="operator">,</span> rowCount()); <span class="keyword">return</span> success; } bool TreeModel<span class="operator">::</span>removeRows(<span class="type">int</span> position<span class="operator">,</span> <span class="type">int</span> rows<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>parent) { TreeItem <span class="operator">*</span>parentItem <span class="operator">=</span> getItem(parent); bool success <span class="operator">=</span> <span class="keyword">true</span>; beginRemoveRows(parent<span class="operator">,</span> position<span class="operator">,</span> position <span class="operator">+</span> rows <span class="operator">-</span> <span class="number">1</span>); success <span class="operator">=</span> parentItem<span class="operator">-</span><span class="operator">></span>removeChildren(position<span class="operator">,</span> rows); endRemoveRows(); <span class="keyword">return</span> success; } <span class="type">int</span> TreeModel<span class="operator">::</span>rowCount(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>parent) <span class="keyword">const</span> { TreeItem <span class="operator">*</span>parentItem <span class="operator">=</span> getItem(parent); <span class="keyword">return</span> parentItem<span class="operator">-</span><span class="operator">></span>childCount(); } bool TreeModel<span class="operator">::</span>setData(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> <span class="operator">&</span>value<span class="operator">,</span> <span class="type">int</span> role) { <span class="keyword">if</span> (role <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>EditRole) <span class="keyword">return</span> <span class="keyword">false</span>; TreeItem <span class="operator">*</span>item <span class="operator">=</span> getItem(index); bool result <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>setData(index<span class="operator">.</span>column()<span class="operator">,</span> value); <span class="keyword">if</span> (result) <span class="keyword">emit</span> dataChanged(index<span class="operator">,</span> index<span class="operator">,</span> {role}); <span class="keyword">return</span> result; } bool TreeModel<span class="operator">::</span>setHeaderData(<span class="type">int</span> section<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Orientation orientation<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> <span class="operator">&</span>value<span class="operator">,</span> <span class="type">int</span> role) { <span class="keyword">if</span> (role <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>EditRole <span class="operator">|</span><span class="operator">|</span> orientation <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal) <span class="keyword">return</span> <span class="keyword">false</span>; bool result <span class="operator">=</span> rootItem<span class="operator">-</span><span class="operator">></span>setData(section<span class="operator">,</span> value); <span class="keyword">if</span> (result) <span class="keyword">emit</span> headerDataChanged(orientation<span class="operator">,</span> section<span class="operator">,</span> section); <span class="keyword">return</span> result; } <span class="type">void</span> TreeModel<span class="operator">::</span>setupModelData(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> <span class="operator">&</span>lines<span class="operator">,</span> TreeItem <span class="operator">*</span>parent) { <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span>TreeItem<span class="operator">*</span><span class="operator">></span> parents; <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type">int</span><span class="operator">></span> indentations; parents <span class="operator"><</span><span class="operator"><</span> parent; indentations <span class="operator"><</span><span class="operator"><</span> <span class="number">0</span>; <span class="type">int</span> number <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">while</span> (number <span class="operator"><</span> lines<span class="operator">.</span>count()) { <span class="type">int</span> position <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">while</span> (position <span class="operator"><</span> lines<span class="operator">[</span>number<span class="operator">]</span><span class="operator">.</span>length()) { <span class="keyword">if</span> (lines<span class="operator">[</span>number<span class="operator">]</span><span class="operator">.</span>at(position) <span class="operator">!</span><span class="operator">=</span> <span class="char">' '</span>) <span class="keyword">break</span>; <span class="operator">+</span><span class="operator">+</span>position; } <span class="type"><a href="../qtcore/qstring.html">QString</a></span> lineData <span class="operator">=</span> lines<span class="operator">[</span>number<span class="operator">]</span><span class="operator">.</span>mid(position)<span class="operator">.</span>trimmed(); <span class="keyword">if</span> (<span class="operator">!</span>lineData<span class="operator">.</span>isEmpty()) { <span class="comment">// Read the column data from the rest of the line.</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> columnStrings <span class="operator">=</span> lineData<span class="operator">.</span>split(<span class="string">"\t"</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>SkipEmptyParts); <span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">></span> columnData; <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> columnStrings<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>column) columnData <span class="operator"><</span><span class="operator"><</span> columnStrings<span class="operator">[</span>column<span class="operator">]</span>; <span class="keyword">if</span> (position <span class="operator">></span> indentations<span class="operator">.</span>last()) { <span class="comment">// The last child of the current parent is now the new parent</span> <span class="comment">// unless the current parent has no children.</span> <span class="keyword">if</span> (parents<span class="operator">.</span>last()<span class="operator">-</span><span class="operator">></span>childCount() <span class="operator">></span> <span class="number">0</span>) { parents <span class="operator"><</span><span class="operator"><</span> parents<span class="operator">.</span>last()<span class="operator">-</span><span class="operator">></span>child(parents<span class="operator">.</span>last()<span class="operator">-</span><span class="operator">></span>childCount()<span class="operator">-</span><span class="number">1</span>); indentations <span class="operator"><</span><span class="operator"><</span> position; } } <span class="keyword">else</span> { <span class="keyword">while</span> (position <span class="operator"><</span> indentations<span class="operator">.</span>last() <span class="operator">&</span><span class="operator">&</span> parents<span class="operator">.</span>count() <span class="operator">></span> <span class="number">0</span>) { parents<span class="operator">.</span>pop_back(); indentations<span class="operator">.</span>pop_back(); } } <span class="comment">// Append a new item to the current parent's list of children.</span> TreeItem <span class="operator">*</span>parent <span class="operator">=</span> parents<span class="operator">.</span>last(); parent<span class="operator">-</span><span class="operator">></span>insertChildren(parent<span class="operator">-</span><span class="operator">></span>childCount()<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> rootItem<span class="operator">-</span><span class="operator">></span>columnCount()); <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> columnData<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>column) parent<span class="operator">-</span><span class="operator">></span>child(parent<span class="operator">-</span><span class="operator">></span>childCount() <span class="operator">-</span> <span class="number">1</span>)<span class="operator">-</span><span class="operator">></span>setData(column<span class="operator">,</span> columnData<span class="operator">[</span>column<span class="operator">]</span>); } <span class="operator">+</span><span class="operator">+</span>number; } } </pre> </div> <!-- @@@itemviews/editabletreemodel/treemodel.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>