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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="small-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) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** &quot;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
** &quot;AS IS&quot; 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.&quot;
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &lt;QtGui&gt;</span>
<span class="preprocessor">#include &quot;mainwindow.h&quot;</span>
<span class="preprocessor">#include &quot;treemodel.h&quot;</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="preprocessor">#ifdef Q_WS_MAEMO_5</span>
<span class="comment">// Alternating row colors look bad on Maemo</span>
view<span class="operator">-</span><span class="operator">&gt;</span>setAlternatingRowColors(<span class="keyword">false</span>);
<span class="preprocessor">#endif</span>
<span class="type"><a href="qstringlist.html">QStringList</a></span> headers;
headers <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Title&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Description&quot;</span>);
<span class="type"><a href="qfile.html">QFile</a></span> file(<span class="string">&quot;:/default.txt&quot;</span>);
file<span class="operator">.</span>open(<span class="type"><a href="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">&gt;</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">&lt;</span> model<span class="operator">-</span><span class="operator">&gt;</span>columnCount(); <span class="operator">+</span><span class="operator">+</span>column)
view<span class="operator">-</span><span class="operator">&gt;</span>resizeColumnToContents(column);
connect(exitAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(quit()));
connect(view<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">,</span>
SIGNAL(selectionChanged(<span class="keyword">const</span> <span class="type"><a href="qitemselection.html">QItemSelection</a></span> <span class="operator">&amp;</span><span class="operator">,</span>
<span class="keyword">const</span> <span class="type"><a href="qitemselection.html">QItemSelection</a></span> <span class="operator">&amp;</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(updateActions()));
connect(actionsMenu<span class="operator">,</span> SIGNAL(aboutToShow())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateActions()));
connect(insertRowAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(insertRow()));
connect(insertColumnAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(insertColumn()));
connect(removeRowAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(removeRow()));
connect(removeColumnAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(removeColumn()));
connect(insertChildAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(insertChild()));
updateActions();
}
<span class="type">void</span> MainWindow<span class="operator">::</span>insertChild()
{
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> view<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</span>currentIndex();
<span class="type"><a href="qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>model <span class="operator">=</span> view<span class="operator">-</span><span class="operator">&gt;</span>model();
<span class="keyword">if</span> (model<span class="operator">-</span><span class="operator">&gt;</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">&gt;</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">&gt;</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">&lt;</span> model<span class="operator">-</span><span class="operator">&gt;</span>columnCount(index); <span class="operator">+</span><span class="operator">+</span>column) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> child <span class="operator">=</span> model<span class="operator">-</span><span class="operator">&gt;</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">&gt;</span>setData(child<span class="operator">,</span> <span class="type"><a href="qvariant.html">QVariant</a></span>(<span class="string">&quot;[No data]&quot;</span>)<span class="operator">,</span> <span class="type"><a href="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">&gt;</span>headerData(column<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Horizontal)<span class="operator">.</span>isValid())
model<span class="operator">-</span><span class="operator">&gt;</span>setHeaderData(column<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> <span class="type"><a href="qvariant.html">QVariant</a></span>(<span class="string">&quot;[No header]&quot;</span>)<span class="operator">,</span>
<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>EditRole);
}
view<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</span>setCurrentIndex(model<span class="operator">-</span><span class="operator">&gt;</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="qitemselectionmodel.html">QItemSelectionModel</a></span><span class="operator">::</span>ClearAndSelect);
updateActions();
}
<span class="type">bool</span> MainWindow<span class="operator">::</span>insertColumn(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&amp;</span>parent)
{
<span class="type"><a href="qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>model <span class="operator">=</span> view<span class="operator">-</span><span class="operator">&gt;</span>model();
<span class="type">int</span> column <span class="operator">=</span> view<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</span>currentIndex()<span class="operator">.</span>column();
<span class="comment">// Insert a column in the parent item.</span>
<span class="type">bool</span> changed <span class="operator">=</span> model<span class="operator">-</span><span class="operator">&gt;</span>insertColumn(column <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> parent);
<span class="keyword">if</span> (changed)
model<span class="operator">-</span><span class="operator">&gt;</span>setHeaderData(column <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> <span class="type"><a href="qvariant.html">QVariant</a></span>(<span class="string">&quot;[No header]&quot;</span>)<span class="operator">,</span>
<span class="type"><a href="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="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> view<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</span>currentIndex();
<span class="type"><a href="qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>model <span class="operator">=</span> view<span class="operator">-</span><span class="operator">&gt;</span>model();
<span class="keyword">if</span> (<span class="operator">!</span>model<span class="operator">-</span><span class="operator">&gt;</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">&lt;</span> model<span class="operator">-</span><span class="operator">&gt;</span>columnCount(index<span class="operator">.</span>parent()); <span class="operator">+</span><span class="operator">+</span>column) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> child <span class="operator">=</span> model<span class="operator">-</span><span class="operator">&gt;</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">&gt;</span>setData(child<span class="operator">,</span> <span class="type"><a href="qvariant.html">QVariant</a></span>(<span class="string">&quot;[No data]&quot;</span>)<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>EditRole);
}
}
<span class="type">bool</span> MainWindow<span class="operator">::</span>removeColumn(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&amp;</span>parent)
{
<span class="type"><a href="qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>model <span class="operator">=</span> view<span class="operator">-</span><span class="operator">&gt;</span>model();
<span class="type">int</span> column <span class="operator">=</span> view<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</span>currentIndex()<span class="operator">.</span>column();
<span class="comment">// Insert columns in each child of the parent item.</span>
<span class="type">bool</span> changed <span class="operator">=</span> model<span class="operator">-</span><span class="operator">&gt;</span>removeColumn(column<span class="operator">,</span> parent);
<span class="keyword">if</span> (<span class="operator">!</span>parent<span class="operator">.</span>isValid() <span class="operator">&amp;</span><span class="operator">&amp;</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="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> view<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</span>currentIndex();
<span class="type"><a href="qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>model <span class="operator">=</span> view<span class="operator">-</span><span class="operator">&gt;</span>model();
<span class="keyword">if</span> (model<span class="operator">-</span><span class="operator">&gt;</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()
{
<span class="type">bool</span> hasSelection <span class="operator">=</span> <span class="operator">!</span>view<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</span>selection()<span class="operator">.</span>isEmpty();
removeRowAction<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasSelection);
removeColumnAction<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasSelection);
<span class="type">bool</span> hasCurrent <span class="operator">=</span> view<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</span>currentIndex()<span class="operator">.</span>isValid();
insertRowAction<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasCurrent);
insertColumnAction<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasCurrent);
<span class="keyword">if</span> (hasCurrent) {
view<span class="operator">-</span><span class="operator">&gt;</span>closePersistentEditor(view<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</span>currentIndex());
<span class="type">int</span> row <span class="operator">=</span> view<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</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">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</span>currentIndex()<span class="operator">.</span>column();
<span class="keyword">if</span> (view<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</span>currentIndex()<span class="operator">.</span>parent()<span class="operator">.</span>isValid())
statusBar()<span class="operator">-</span><span class="operator">&gt;</span>showMessage(tr(<span class="string">&quot;Position: (%1,%2)&quot;</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">&gt;</span>showMessage(tr(<span class="string">&quot;Position: (%1,%2) in top level&quot;</span>)<span class="operator">.</span>arg(row)<span class="operator">.</span>arg(column));
}
}</pre>
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