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<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="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 -->
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>
core-updates
>
by-pkgid
>
768f7d9f703884aa2562bf0a651086df
>
files
>
4003
