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qt4-x11/doc/html/sql-masterdetail-mainwindow-cpp.html
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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="small-subtitle">sql/masterdetail/mainwindow.cpp</span>
<!-- $$$sql/masterdetail/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 &quot;mainwindow.h&quot;</span>
<span class="preprocessor">#include &quot;dialog.h&quot;</span>
<span class="preprocessor">#include &lt;QtGui&gt;</span>
<span class="preprocessor">#include &lt;QtSql&gt;</span>
<span class="preprocessor">#include &lt;QtXml&gt;</span>
<span class="keyword">extern</span> <span class="type">int</span> uniqueAlbumId;
<span class="keyword">extern</span> <span class="type">int</span> uniqueArtistId;
MainWindow<span class="operator">::</span>MainWindow(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>artistTable<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>albumTable<span class="operator">,</span>
<span class="type"><a href="qfile.html">QFile</a></span> <span class="operator">*</span>albumDetails<span class="operator">,</span> <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)
{
file <span class="operator">=</span> albumDetails;
readAlbumData();
model <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsqlrelationaltablemodel.html">QSqlRelationalTableModel</a></span>(<span class="keyword">this</span>);
model<span class="operator">-</span><span class="operator">&gt;</span>setTable(albumTable);
model<span class="operator">-</span><span class="operator">&gt;</span>setRelation(<span class="number">2</span><span class="operator">,</span> <span class="type"><a href="qsqlrelation.html">QSqlRelation</a></span>(artistTable<span class="operator">,</span> <span class="string">&quot;id&quot;</span><span class="operator">,</span> <span class="string">&quot;artist&quot;</span>));
model<span class="operator">-</span><span class="operator">&gt;</span>select();
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>artists <span class="operator">=</span> createArtistGroupBox();
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>albums <span class="operator">=</span> createAlbumGroupBox();
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>details <span class="operator">=</span> createDetailsGroupBox();
artistView<span class="operator">-</span><span class="operator">&gt;</span>setCurrentIndex(<span class="number">0</span>);
uniqueAlbumId <span class="operator">=</span> model<span class="operator">-</span><span class="operator">&gt;</span>rowCount();
uniqueArtistId <span class="operator">=</span> artistView<span class="operator">-</span><span class="operator">&gt;</span>count();
connect(model<span class="operator">,</span> SIGNAL(rowsInserted(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span><span class="operator">,</span><span class="type">int</span><span class="operator">,</span><span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(updateHeader(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span><span class="operator">,</span><span class="type">int</span><span class="operator">,</span><span class="type">int</span>)));
connect(model<span class="operator">,</span> SIGNAL(rowsRemoved(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span><span class="operator">,</span><span class="type">int</span><span class="operator">,</span><span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(updateHeader(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span><span class="operator">,</span><span class="type">int</span><span class="operator">,</span><span class="type">int</span>)));
<span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(artists<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(albums<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span>);
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(details<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">1</span>);
<span class="preprocessor">#if !defined(Q_OS_SYMBIAN) &amp;&amp; !defined(Q_WS_MAEMO_5)</span>
layout<span class="operator">-</span><span class="operator">&gt;</span>setColumnStretch(<span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">&gt;</span>setColumnMinimumWidth(<span class="number">0</span><span class="operator">,</span> <span class="number">500</span>);
<span class="preprocessor">#endif</span>
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qwidget.html">QWidget</a></span>;
widget<span class="operator">-</span><span class="operator">&gt;</span>setLayout(layout);
setCentralWidget(widget);
createMenuBar();
showImageLabel();
<span class="preprocessor">#if !defined(Q_OS_SYMBIAN) &amp;&amp; !defined(Q_WS_MAEMO_5)</span>
resize(<span class="number">850</span><span class="operator">,</span> <span class="number">400</span>);
<span class="preprocessor">#endif</span>
setWindowTitle(tr(<span class="string">&quot;Music Archive&quot;</span>));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>changeArtist(<span class="type">int</span> row)
{
<span class="keyword">if</span> (row <span class="operator">&gt;</span> <span class="number">0</span>) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> model<span class="operator">-</span><span class="operator">&gt;</span>relationModel(<span class="number">2</span>)<span class="operator">-</span><span class="operator">&gt;</span>index(row<span class="operator">,</span> <span class="number">1</span>);
model<span class="operator">-</span><span class="operator">&gt;</span>setFilter(<span class="string">&quot;artist = '&quot;</span> <span class="operator">+</span> index<span class="operator">.</span>data()<span class="operator">.</span>toString() <span class="operator">+</span> <span class="char">'\''</span>) ;
showArtistProfile(index);
} <span class="keyword">else</span> <span class="keyword">if</span> (row <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) {
model<span class="operator">-</span><span class="operator">&gt;</span>setFilter(<span class="type"><a href="qstring.html">QString</a></span>());
showImageLabel();
} <span class="keyword">else</span> {
<span class="keyword">return</span>;
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>showArtistProfile(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index)
{
<span class="type"><a href="qsqlrecord.html">QSqlRecord</a></span> record <span class="operator">=</span> model<span class="operator">-</span><span class="operator">&gt;</span>relationModel(<span class="number">2</span>)<span class="operator">-</span><span class="operator">&gt;</span>record(index<span class="operator">.</span>row());
<span class="type"><a href="qstring.html">QString</a></span> name <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">&quot;artist&quot;</span>)<span class="operator">.</span>toString();
<span class="type"><a href="qstring.html">QString</a></span> count <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">&quot;albumcount&quot;</span>)<span class="operator">.</span>toString();
profileLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Artist : %1 \n&quot;</span> \
<span class="string">&quot;Number of Albums: %2&quot;</span>)<span class="operator">.</span>arg(name)<span class="operator">.</span>arg(count));
profileLabel<span class="operator">-</span><span class="operator">&gt;</span>show();
iconLabel<span class="operator">-</span><span class="operator">&gt;</span>show();
titleLabel<span class="operator">-</span><span class="operator">&gt;</span>hide();
trackList<span class="operator">-</span><span class="operator">&gt;</span>hide();
imageLabel<span class="operator">-</span><span class="operator">&gt;</span>hide();
}
<span class="type">void</span> MainWindow<span class="operator">::</span>showAlbumDetails(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index)
{
<span class="type"><a href="qsqlrecord.html">QSqlRecord</a></span> record <span class="operator">=</span> model<span class="operator">-</span><span class="operator">&gt;</span>record(index<span class="operator">.</span>row());
<span class="type"><a href="qstring.html">QString</a></span> artist <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">&quot;artist&quot;</span>)<span class="operator">.</span>toString();
<span class="type"><a href="qstring.html">QString</a></span> title <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">&quot;title&quot;</span>)<span class="operator">.</span>toString();
<span class="type"><a href="qstring.html">QString</a></span> year <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">&quot;year&quot;</span>)<span class="operator">.</span>toString();
<span class="type"><a href="qstring.html">QString</a></span> albumId <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">&quot;albumid&quot;</span>)<span class="operator">.</span>toString();
showArtistProfile(indexOfArtist(artist));
titleLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Title: %1 (%2)&quot;</span>)<span class="operator">.</span>arg(title)<span class="operator">.</span>arg(year));
titleLabel<span class="operator">-</span><span class="operator">&gt;</span>show();
<span class="type"><a href="qdomnodelist.html">QDomNodeList</a></span> albums <span class="operator">=</span> albumData<span class="operator">.</span>elementsByTagName(<span class="string">&quot;album&quot;</span>);
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> albums<span class="operator">.</span>count(); i<span class="operator">+</span><span class="operator">+</span>) {
<span class="type"><a href="qdomnode.html">QDomNode</a></span> album <span class="operator">=</span> albums<span class="operator">.</span>item(i);
<span class="keyword">if</span> (album<span class="operator">.</span>toElement()<span class="operator">.</span>attribute(<span class="string">&quot;id&quot;</span>) <span class="operator">=</span><span class="operator">=</span> albumId) {
getTrackList(album<span class="operator">.</span>toElement());
<span class="keyword">break</span>;
}
}
<span class="keyword">if</span> (<span class="operator">!</span>trackList<span class="operator">-</span><span class="operator">&gt;</span>count() <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
trackList<span class="operator">-</span><span class="operator">&gt;</span>show();
}
<span class="type">void</span> MainWindow<span class="operator">::</span>getTrackList(<span class="type"><a href="qdomnode.html">QDomNode</a></span> album)
{
trackList<span class="operator">-</span><span class="operator">&gt;</span>clear();
<span class="type"><a href="qdomnodelist.html">QDomNodeList</a></span> tracks <span class="operator">=</span> album<span class="operator">.</span>childNodes();
<span class="type"><a href="qdomnode.html">QDomNode</a></span> track;
<span class="type"><a href="qstring.html">QString</a></span> trackNumber;
<span class="keyword">for</span> (<span class="type">int</span> j <span class="operator">=</span> <span class="number">0</span>; j <span class="operator">&lt;</span> tracks<span class="operator">.</span>count(); j<span class="operator">+</span><span class="operator">+</span>) {
track <span class="operator">=</span> tracks<span class="operator">.</span>item(j);
trackNumber <span class="operator">=</span> track<span class="operator">.</span>toElement()<span class="operator">.</span>attribute(<span class="string">&quot;number&quot;</span>);
<span class="type"><a href="qlistwidgetitem.html">QListWidgetItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlistwidgetitem.html">QListWidgetItem</a></span>(trackList);
item<span class="operator">-</span><span class="operator">&gt;</span>setText(trackNumber <span class="operator">+</span> <span class="string">&quot;: &quot;</span> <span class="operator">+</span> track<span class="operator">.</span>toElement()<span class="operator">.</span>text());
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>addAlbum()
{
Dialog <span class="operator">*</span>dialog <span class="operator">=</span> <span class="keyword">new</span> Dialog(model<span class="operator">,</span> albumData<span class="operator">,</span> file<span class="operator">,</span> <span class="keyword">this</span>);
<span class="type">int</span> accepted <span class="operator">=</span> dialog<span class="operator">-</span><span class="operator">&gt;</span>exec();
<span class="keyword">if</span> (accepted <span class="operator">=</span><span class="operator">=</span> <span class="number">1</span>) {
<span class="type">int</span> lastRow <span class="operator">=</span> model<span class="operator">-</span><span class="operator">&gt;</span>rowCount() <span class="operator">-</span> <span class="number">1</span>;
albumView<span class="operator">-</span><span class="operator">&gt;</span>selectRow(lastRow);
albumView<span class="operator">-</span><span class="operator">&gt;</span>scrollToBottom();
showAlbumDetails(model<span class="operator">-</span><span class="operator">&gt;</span>index(lastRow<span class="operator">,</span> <span class="number">0</span>));
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>deleteAlbum()
{
<span class="type"><a href="qmodelindex.html#QModelIndexList-typedef">QModelIndexList</a></span> selection <span class="operator">=</span> albumView<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</span>selectedRows(<span class="number">0</span>);
<span class="keyword">if</span> (<span class="operator">!</span>selection<span class="operator">.</span>empty()) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> idIndex <span class="operator">=</span> selection<span class="operator">.</span>at(<span class="number">0</span>);
<span class="type">int</span> id <span class="operator">=</span> idIndex<span class="operator">.</span>data()<span class="operator">.</span>toInt();
<span class="type"><a href="qstring.html">QString</a></span> title <span class="operator">=</span> idIndex<span class="operator">.</span>sibling(idIndex<span class="operator">.</span>row()<span class="operator">,</span> <span class="number">1</span>)<span class="operator">.</span>data()<span class="operator">.</span>toString();
<span class="type"><a href="qstring.html">QString</a></span> artist <span class="operator">=</span> idIndex<span class="operator">.</span>sibling(idIndex<span class="operator">.</span>row()<span class="operator">,</span> <span class="number">2</span>)<span class="operator">.</span>data()<span class="operator">.</span>toString();
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>StandardButton button;
button <span class="operator">=</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>question(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Delete Album&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;Are you sure you want to &quot;</span>
<span class="string">&quot;delete '%1' by '%2'?&quot;</span>)
<span class="operator">.</span>arg(title<span class="operator">,</span> artist)<span class="operator">,</span>
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Yes <span class="operator">|</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>No);
<span class="keyword">if</span> (button <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Yes) {
removeAlbumFromFile(id);
removeAlbumFromDatabase(idIndex);
decreaseAlbumCount(indexOfArtist(artist));
showImageLabel();
}
} <span class="keyword">else</span> {
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Delete Album&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;Select the album you want to delete.&quot;</span>));
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>removeAlbumFromFile(<span class="type">int</span> id)
{
<span class="type"><a href="qdomnodelist.html">QDomNodeList</a></span> albums <span class="operator">=</span> albumData<span class="operator">.</span>elementsByTagName(<span class="string">&quot;album&quot;</span>);
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> albums<span class="operator">.</span>count(); i<span class="operator">+</span><span class="operator">+</span>) {
<span class="type"><a href="qdomnode.html">QDomNode</a></span> node <span class="operator">=</span> albums<span class="operator">.</span>item(i);
<span class="keyword">if</span> (node<span class="operator">.</span>toElement()<span class="operator">.</span>attribute(<span class="string">&quot;id&quot;</span>)<span class="operator">.</span>toInt() <span class="operator">=</span><span class="operator">=</span> id) {
albumData<span class="operator">.</span>elementsByTagName(<span class="string">&quot;archive&quot;</span>)<span class="operator">.</span>item(<span class="number">0</span>)<span class="operator">.</span>removeChild(node);
<span class="keyword">break</span>;
}
}
<span class="comment">/*
The following code is commented out since the example uses an in
memory database, i.e., altering the XML file will bring the data
out of sync.
if (!file-&gt;open(QIODevice::WriteOnly)) {
return;
} else {
QTextStream stream(file);
albumData.elementsByTagName(&quot;archive&quot;).item(0).save(stream, 4);
file-&gt;close();
}
*/</span>
}
<span class="type">void</span> MainWindow<span class="operator">::</span>removeAlbumFromDatabase(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index)
{
model<span class="operator">-</span><span class="operator">&gt;</span>removeRow(index<span class="operator">.</span>row());
}
<span class="type">void</span> MainWindow<span class="operator">::</span>decreaseAlbumCount(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> artistIndex)
{
<span class="type">int</span> row <span class="operator">=</span> artistIndex<span class="operator">.</span>row();
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> albumCountIndex <span class="operator">=</span> artistIndex<span class="operator">.</span>sibling(row<span class="operator">,</span> <span class="number">2</span>);
<span class="type">int</span> albumCount <span class="operator">=</span> albumCountIndex<span class="operator">.</span>data()<span class="operator">.</span>toInt();
<span class="type"><a href="qsqltablemodel.html">QSqlTableModel</a></span> <span class="operator">*</span>artists <span class="operator">=</span> model<span class="operator">-</span><span class="operator">&gt;</span>relationModel(<span class="number">2</span>);
<span class="keyword">if</span> (albumCount <span class="operator">=</span><span class="operator">=</span> <span class="number">1</span>) {
artists<span class="operator">-</span><span class="operator">&gt;</span>removeRow(row);
showImageLabel();
} <span class="keyword">else</span> {
artists<span class="operator">-</span><span class="operator">&gt;</span>setData(albumCountIndex<span class="operator">,</span> <span class="type"><a href="qvariant.html">QVariant</a></span>(albumCount <span class="operator">-</span> <span class="number">1</span>));
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>readAlbumData()
{
<span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">-</span><span class="operator">&gt;</span>open(<span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly))
<span class="keyword">return</span>;
<span class="keyword">if</span> (<span class="operator">!</span>albumData<span class="operator">.</span>setContent(file)) {
file<span class="operator">-</span><span class="operator">&gt;</span>close();
<span class="keyword">return</span>;
}
file<span class="operator">-</span><span class="operator">&gt;</span>close();
}
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span><span class="operator">*</span> MainWindow<span class="operator">::</span>createArtistGroupBox()
{
artistView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>;
artistView<span class="operator">-</span><span class="operator">&gt;</span>setModel(model<span class="operator">-</span><span class="operator">&gt;</span>relationModel(<span class="number">2</span>));
artistView<span class="operator">-</span><span class="operator">&gt;</span>setModelColumn(<span class="number">1</span>);
connect(artistView<span class="operator">,</span> SIGNAL(currentIndexChanged(<span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(changeArtist(<span class="type">int</span>)));
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>box <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(tr(<span class="string">&quot;Artist&quot;</span>));
<span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(artistView<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
box<span class="operator">-</span><span class="operator">&gt;</span>setLayout(layout);
<span class="keyword">return</span> box;
}
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span><span class="operator">*</span> MainWindow<span class="operator">::</span>createAlbumGroupBox()
{
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>box <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(tr(<span class="string">&quot;Album&quot;</span>));
albumView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtableview.html">QTableView</a></span>;
albumView<span class="operator">-</span><span class="operator">&gt;</span>setEditTriggers(<span class="type"><a href="qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>NoEditTriggers);
albumView<span class="operator">-</span><span class="operator">&gt;</span>setSortingEnabled(<span class="keyword">true</span>);
albumView<span class="operator">-</span><span class="operator">&gt;</span>setSelectionBehavior(<span class="type"><a href="qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>SelectRows);
albumView<span class="operator">-</span><span class="operator">&gt;</span>setSelectionMode(<span class="type"><a href="qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>SingleSelection);
albumView<span class="operator">-</span><span class="operator">&gt;</span>setShowGrid(<span class="keyword">false</span>);
albumView<span class="operator">-</span><span class="operator">&gt;</span>verticalHeader()<span class="operator">-</span><span class="operator">&gt;</span>hide();
albumView<span class="operator">-</span><span class="operator">&gt;</span>setAlternatingRowColors(<span class="keyword">true</span>);
albumView<span class="operator">-</span><span class="operator">&gt;</span>setModel(model);
adjustHeader();
<span class="type"><a href="qlocale.html">QLocale</a></span> locale <span class="operator">=</span> albumView<span class="operator">-</span><span class="operator">&gt;</span>locale();
locale<span class="operator">.</span>setNumberOptions(<span class="type"><a href="qlocale.html">QLocale</a></span><span class="operator">::</span>OmitGroupSeparator);
albumView<span class="operator">-</span><span class="operator">&gt;</span>setLocale(locale);
connect(albumView<span class="operator">,</span> SIGNAL(clicked(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(showAlbumDetails(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span>)));
connect(albumView<span class="operator">,</span> SIGNAL(activated(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(showAlbumDetails(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span>)));
<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>;
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(albumView<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
box<span class="operator">-</span><span class="operator">&gt;</span>setLayout(layout);
<span class="keyword">return</span> box;
}
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span><span class="operator">*</span> MainWindow<span class="operator">::</span>createDetailsGroupBox()
{
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>box <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(tr(<span class="string">&quot;Details&quot;</span>));
profileLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
profileLabel<span class="operator">-</span><span class="operator">&gt;</span>setWordWrap(<span class="keyword">true</span>);
profileLabel<span class="operator">-</span><span class="operator">&gt;</span>setAlignment(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>AlignBottom);
titleLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
titleLabel<span class="operator">-</span><span class="operator">&gt;</span>setWordWrap(<span class="keyword">true</span>);
titleLabel<span class="operator">-</span><span class="operator">&gt;</span>setAlignment(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>AlignBottom);
iconLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>();
iconLabel<span class="operator">-</span><span class="operator">&gt;</span>setAlignment(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>AlignBottom <span class="operator">|</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>AlignRight);
iconLabel<span class="operator">-</span><span class="operator">&gt;</span>setPixmap(<span class="type"><a href="qpixmap.html">QPixmap</a></span>(<span class="string">&quot;:/images/icon.png&quot;</span>));
imageLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
imageLabel<span class="operator">-</span><span class="operator">&gt;</span>setWordWrap(<span class="keyword">true</span>);
imageLabel<span class="operator">-</span><span class="operator">&gt;</span>setAlignment(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>AlignCenter);
imageLabel<span class="operator">-</span><span class="operator">&gt;</span>setPixmap(<span class="type"><a href="qpixmap.html">QPixmap</a></span>(<span class="string">&quot;:/images/image.png&quot;</span>));
trackList <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlistwidget.html">QListWidget</a></span>;
<span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(imageLabel<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">2</span>);
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(profileLabel<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(iconLabel<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(titleLabel<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>);
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(trackList<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>);
layout<span class="operator">-</span><span class="operator">&gt;</span>setRowStretch(<span class="number">2</span><span class="operator">,</span> <span class="number">1</span>);
box<span class="operator">-</span><span class="operator">&gt;</span>setLayout(layout);
<span class="keyword">return</span> box;
}
<span class="type">void</span> MainWindow<span class="operator">::</span>createMenuBar()
{
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>addAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Add album...&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>deleteAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Delete album...&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>quitAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Quit&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>aboutAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;About&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>aboutQtAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;About &amp;Qt&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
addAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl+A&quot;</span>));
deleteAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl+D&quot;</span>));
quitAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Quit);
<span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>fileMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;File&quot;</span>));
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(addAction);
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(deleteAction);
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(quitAction);
<span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>helpMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;Help&quot;</span>));
helpMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(aboutAction);
helpMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(aboutQtAction);
connect(addAction<span class="operator">,</span> SIGNAL(triggered(<span class="type">bool</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(addAlbum()));
connect(deleteAction<span class="operator">,</span> SIGNAL(triggered(<span class="type">bool</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(deleteAlbum()));
connect(quitAction<span class="operator">,</span> SIGNAL(triggered(<span class="type">bool</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));
connect(aboutAction<span class="operator">,</span> SIGNAL(triggered(<span class="type">bool</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(about()));
connect(aboutQtAction<span class="operator">,</span> SIGNAL(triggered(<span class="type">bool</span>))<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(aboutQt()));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>showImageLabel()
{
profileLabel<span class="operator">-</span><span class="operator">&gt;</span>hide();
titleLabel<span class="operator">-</span><span class="operator">&gt;</span>hide();
iconLabel<span class="operator">-</span><span class="operator">&gt;</span>hide();
trackList<span class="operator">-</span><span class="operator">&gt;</span>hide();
imageLabel<span class="operator">-</span><span class="operator">&gt;</span>show();
}
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> MainWindow<span class="operator">::</span>indexOfArtist(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>artist)
{
<span class="type"><a href="qsqltablemodel.html">QSqlTableModel</a></span> <span class="operator">*</span>artistModel <span class="operator">=</span> model<span class="operator">-</span><span class="operator">&gt;</span>relationModel(<span class="number">2</span>);
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> artistModel<span class="operator">-</span><span class="operator">&gt;</span>rowCount(); i<span class="operator">+</span><span class="operator">+</span>) {
<span class="type"><a href="qsqlrecord.html">QSqlRecord</a></span> record <span class="operator">=</span> artistModel<span class="operator">-</span><span class="operator">&gt;</span>record(i);
<span class="keyword">if</span> (record<span class="operator">.</span>value(<span class="string">&quot;artist&quot;</span>) <span class="operator">=</span><span class="operator">=</span> artist)
<span class="keyword">return</span> artistModel<span class="operator">-</span><span class="operator">&gt;</span>index(i<span class="operator">,</span> <span class="number">1</span>);
}
<span class="keyword">return</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span>();
}
<span class="type">void</span> MainWindow<span class="operator">::</span>updateHeader(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span><span class="operator">,</span> <span class="type">int</span><span class="operator">,</span> <span class="type">int</span>)
{
adjustHeader();
}
<span class="type">void</span> MainWindow<span class="operator">::</span>adjustHeader()
{
albumView<span class="operator">-</span><span class="operator">&gt;</span>hideColumn(<span class="number">0</span>);
albumView<span class="operator">-</span><span class="operator">&gt;</span>horizontalHeader()<span class="operator">-</span><span class="operator">&gt;</span>setResizeMode(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="qheaderview.html">QHeaderView</a></span><span class="operator">::</span>Stretch);
albumView<span class="operator">-</span><span class="operator">&gt;</span>resizeColumnToContents(<span class="number">2</span>);
albumView<span class="operator">-</span><span class="operator">&gt;</span>resizeColumnToContents(<span class="number">3</span>);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>about()
{
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>about(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;About Music Archive&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;&lt;p&gt;The &lt;b&gt;Music Archive&lt;/b&gt; example shows how to present &quot;</span>
<span class="string">&quot;data from different data sources in the same application. &quot;</span>
<span class="string">&quot;The album titles, and the corresponding artists and release dates, &quot;</span>
<span class="string">&quot;are kept in a database, while each album's tracks are stored &quot;</span>
<span class="string">&quot;in an XML file. &lt;/p&gt;&lt;p&gt;The example also shows how to add as &quot;</span>
<span class="string">&quot;well as remove data from both the database and the &quot;</span>
<span class="string">&quot;associated XML file using the API provided by the QtSql and &quot;</span>
<span class="string">&quot;QtXml modules, respectively.&lt;/p&gt;&quot;</span>));
}</pre>
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