<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>mainwindow.cpp Example File | Qt SQL 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="qtsql-index.html">Qt SQL</a></td><td ><a href="qtsql-masterdetail-example.html">Master Detail Example</a></td><td >mainwindow.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtsql-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">mainwindow.cpp Example File</h1> <span class="subtitle">masterdetail/mainwindow.cpp</span> <!-- $$$masterdetail/mainwindow.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of The Qt Company Ltd nor the names of its ** contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include "mainwindow.h"</span> <span class="preprocessor">#include "dialog.h"</span> <span class="preprocessor">#include <QtWidgets></span> <span class="preprocessor">#include <QtSql></span> <span class="preprocessor">#include <QtXml></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="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>artistTable<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>albumTable<span class="operator">,</span> <span class="type"><a href="../qtcore/qfile.html">QFile</a></span> <span class="operator">*</span>albumDetails<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="../qtwidgets/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">></span>setTable(albumTable); model<span class="operator">-</span><span class="operator">></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">"id"</span><span class="operator">,</span> <span class="string">"artist"</span>)); model<span class="operator">-</span><span class="operator">></span>select(); <span class="type"><a href="../qtwidgets/qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>artists <span class="operator">=</span> createArtistGroupBox(); <span class="type"><a href="../qtwidgets/qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>albums <span class="operator">=</span> createAlbumGroupBox(); <span class="type"><a href="../qtwidgets/qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>details <span class="operator">=</span> createDetailsGroupBox(); artistView<span class="operator">-</span><span class="operator">></span>setCurrentIndex(<span class="number">0</span>); uniqueAlbumId <span class="operator">=</span> model<span class="operator">-</span><span class="operator">></span>rowCount(); uniqueArtistId <span class="operator">=</span> artistView<span class="operator">-</span><span class="operator">></span>count(); connect(model<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qsqlrelationaltablemodel.html">QSqlRelationalTableModel</a></span><span class="operator">::</span>rowsInserted<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>updateHeader); connect(model<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qsqlrelationaltablemodel.html">QSqlRelationalTableModel</a></span><span class="operator">::</span>rowsRemoved<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>updateHeader); <span class="type"><a href="../qtwidgets/qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qgridlayout.html">QGridLayout</a></span>; layout<span class="operator">-</span><span class="operator">></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">></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">></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>); layout<span class="operator">-</span><span class="operator">></span>setColumnStretch(<span class="number">1</span><span class="operator">,</span> <span class="number">1</span>); layout<span class="operator">-</span><span class="operator">></span>setColumnMinimumWidth(<span class="number">0</span><span class="operator">,</span> <span class="number">500</span>); <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>widget <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span>; widget<span class="operator">-</span><span class="operator">></span>setLayout(layout); setCentralWidget(widget); createMenuBar(); showImageLabel(); resize(<span class="number">850</span><span class="operator">,</span> <span class="number">400</span>); setWindowTitle(tr(<span class="string">"Music Archive"</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">></span> <span class="number">0</span>) { <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> model<span class="operator">-</span><span class="operator">></span>relationModel(<span class="number">2</span>)<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">1</span>); model<span class="operator">-</span><span class="operator">></span>setFilter(<span class="string">"artist = '"</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">></span>setFilter(<span class="type"><a href="../qtcore/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="../qtcore/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">></span>relationModel(<span class="number">2</span>)<span class="operator">-</span><span class="operator">></span>record(index<span class="operator">.</span>row()); <span class="type"><a href="../qtcore/qstring.html">QString</a></span> name <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">"artist"</span>)<span class="operator">.</span>toString(); <span class="type"><a href="../qtcore/qstring.html">QString</a></span> count <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">"albumcount"</span>)<span class="operator">.</span>toString(); profileLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Artist : %1 \n"</span> \ <span class="string">"Number of Albums: %2"</span>)<span class="operator">.</span>arg(name)<span class="operator">.</span>arg(count)); profileLabel<span class="operator">-</span><span class="operator">></span>show(); iconLabel<span class="operator">-</span><span class="operator">></span>show(); titleLabel<span class="operator">-</span><span class="operator">></span>hide(); trackList<span class="operator">-</span><span class="operator">></span>hide(); imageLabel<span class="operator">-</span><span class="operator">></span>hide(); } <span class="type">void</span> MainWindow<span class="operator">::</span>showAlbumDetails(<span class="type"><a href="../qtcore/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">></span>record(index<span class="operator">.</span>row()); <span class="type"><a href="../qtcore/qstring.html">QString</a></span> artist <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">"artist"</span>)<span class="operator">.</span>toString(); <span class="type"><a href="../qtcore/qstring.html">QString</a></span> title <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">"title"</span>)<span class="operator">.</span>toString(); <span class="type"><a href="../qtcore/qstring.html">QString</a></span> year <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">"year"</span>)<span class="operator">.</span>toString(); <span class="type"><a href="../qtcore/qstring.html">QString</a></span> albumId <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">"albumid"</span>)<span class="operator">.</span>toString(); showArtistProfile(indexOfArtist(artist)); titleLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Title: %1 (%2)"</span>)<span class="operator">.</span>arg(title)<span class="operator">.</span>arg(year)); titleLabel<span class="operator">-</span><span class="operator">></span>show(); <span class="type">QDomNodeList</span> albums <span class="operator">=</span> albumData<span class="operator">.</span>elementsByTagName(<span class="string">"album"</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"><</span> albums<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i) { <span class="type">QDomNode</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">"id"</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> (trackList<span class="operator">-</span><span class="operator">></span>count() <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>) trackList<span class="operator">-</span><span class="operator">></span>show(); } <span class="type">void</span> MainWindow<span class="operator">::</span>getTrackList(<span class="type">QDomNode</span> album) { trackList<span class="operator">-</span><span class="operator">></span>clear(); <span class="type">QDomNodeList</span> tracks <span class="operator">=</span> album<span class="operator">.</span>childNodes(); <span class="type">QDomNode</span> track; <span class="type"><a href="../qtcore/qstring.html">QString</a></span> trackNumber; <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> tracks<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i) { track <span class="operator">=</span> tracks<span class="operator">.</span>item(i); trackNumber <span class="operator">=</span> track<span class="operator">.</span>toElement()<span class="operator">.</span>attribute(<span class="string">"number"</span>); <span class="type"><a href="../qtwidgets/qlistwidgetitem.html">QListWidgetItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qlistwidgetitem.html">QListWidgetItem</a></span>(trackList); item<span class="operator">-</span><span class="operator">></span>setText(trackNumber <span class="operator">+</span> <span class="string">": "</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">></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">></span>rowCount() <span class="operator">-</span> <span class="number">1</span>; albumView<span class="operator">-</span><span class="operator">></span>selectRow(lastRow); albumView<span class="operator">-</span><span class="operator">></span>scrollToBottom(); showAlbumDetails(model<span class="operator">-</span><span class="operator">></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="../qtcore/qmodelindex.html#QModelIndexList-typedef">QModelIndexList</a></span> selection <span class="operator">=</span> albumView<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></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="../qtcore/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="../qtcore/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="../qtcore/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="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>StandardButton button; button <span class="operator">=</span> <span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>question(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Delete Album"</span>)<span class="operator">,</span> tr(<span class="string">"Are you sure you want to "</span> <span class="string">"delete '%1' by '%2'?"</span>) <span class="operator">.</span>arg(title<span class="operator">,</span> artist)<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Yes <span class="operator">|</span> <span class="type"><a href="../qtwidgets/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="../qtwidgets/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="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Delete Album"</span>)<span class="operator">,</span> tr(<span class="string">"Select the album you want to delete."</span>)); } } <span class="type">void</span> MainWindow<span class="operator">::</span>removeAlbumFromFile(<span class="type">int</span> id) { <span class="type">QDomNodeList</span> albums <span class="operator">=</span> albumData<span class="operator">.</span>elementsByTagName(<span class="string">"album"</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"><</span> albums<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i) { <span class="type">QDomNode</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">"id"</span>)<span class="operator">.</span>toInt() <span class="operator">=</span><span class="operator">=</span> id) { albumData<span class="operator">.</span>elementsByTagName(<span class="string">"archive"</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->open(QIODevice::WriteOnly)) { return; } else { QTextStream stream(file); albumData.elementsByTagName("archive").item(0).save(stream, 4); file->close(); } */</span> } <span class="type">void</span> MainWindow<span class="operator">::</span>removeAlbumFromDatabase(<span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> index) { model<span class="operator">-</span><span class="operator">></span>removeRow(index<span class="operator">.</span>row()); } <span class="type">void</span> MainWindow<span class="operator">::</span>decreaseAlbumCount(<span class="type"><a href="../qtcore/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="../qtcore/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">></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">></span>removeRow(row); showImageLabel(); } <span class="keyword">else</span> { artists<span class="operator">-</span><span class="operator">></span>setData(albumCountIndex<span class="operator">,</span> <span class="type"><a href="../qtcore/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">></span>open(<span class="type"><a href="../qtcore/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">></span>close(); <span class="keyword">return</span>; } file<span class="operator">-</span><span class="operator">></span>close(); } <span class="type"><a href="../qtwidgets/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="../qtwidgets/qcombobox.html">QComboBox</a></span>; artistView<span class="operator">-</span><span class="operator">></span>setModel(model<span class="operator">-</span><span class="operator">></span>relationModel(<span class="number">2</span>)); artistView<span class="operator">-</span><span class="operator">></span>setModelColumn(<span class="number">1</span>); connect(artistView<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="../qtwidgets/qcombobox.html">QComboBox</a></span><span class="operator">::</span>currentIndexChanged)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>changeArtist); <span class="type"><a href="../qtwidgets/qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>box <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qgroupbox.html">QGroupBox</a></span>(tr(<span class="string">"Artist"</span>)); <span class="type"><a href="../qtwidgets/qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qgridlayout.html">QGridLayout</a></span>; layout<span class="operator">-</span><span class="operator">></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">></span>setLayout(layout); <span class="keyword">return</span> box; } <span class="type"><a href="../qtwidgets/qgroupbox.html">QGroupBox</a></span><span class="operator">*</span> MainWindow<span class="operator">::</span>createAlbumGroupBox() { <span class="type"><a href="../qtwidgets/qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>box <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qgroupbox.html">QGroupBox</a></span>(tr(<span class="string">"Album"</span>)); albumView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qtableview.html">QTableView</a></span>; albumView<span class="operator">-</span><span class="operator">></span>setEditTriggers(<span class="type"><a href="../qtwidgets/qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>NoEditTriggers); albumView<span class="operator">-</span><span class="operator">></span>setSortingEnabled(<span class="keyword">true</span>); albumView<span class="operator">-</span><span class="operator">></span>setSelectionBehavior(<span class="type"><a href="../qtwidgets/qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>SelectRows); albumView<span class="operator">-</span><span class="operator">></span>setSelectionMode(<span class="type"><a href="../qtwidgets/qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>SingleSelection); albumView<span class="operator">-</span><span class="operator">></span>setShowGrid(<span class="keyword">false</span>); albumView<span class="operator">-</span><span class="operator">></span>verticalHeader()<span class="operator">-</span><span class="operator">></span>hide(); albumView<span class="operator">-</span><span class="operator">></span>setAlternatingRowColors(<span class="keyword">true</span>); albumView<span class="operator">-</span><span class="operator">></span>setModel(model); adjustHeader(); <span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span> locale <span class="operator">=</span> albumView<span class="operator">-</span><span class="operator">></span>locale(); locale<span class="operator">.</span>setNumberOptions(<span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span><span class="operator">::</span>OmitGroupSeparator); albumView<span class="operator">-</span><span class="operator">></span>setLocale(locale); connect(albumView<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qtableview.html">QTableView</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>showAlbumDetails); connect(albumView<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qtableview.html">QTableView</a></span><span class="operator">::</span>activated<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>showAlbumDetails); <span class="type"><a href="../qtwidgets/qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qvboxlayout.html">QVBoxLayout</a></span>; layout<span class="operator">-</span><span class="operator">></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">></span>setLayout(layout); <span class="keyword">return</span> box; } <span class="type"><a href="../qtwidgets/qgroupbox.html">QGroupBox</a></span><span class="operator">*</span> MainWindow<span class="operator">::</span>createDetailsGroupBox() { <span class="type"><a href="../qtwidgets/qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>box <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qgroupbox.html">QGroupBox</a></span>(tr(<span class="string">"Details"</span>)); profileLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qlabel.html">QLabel</a></span>; profileLabel<span class="operator">-</span><span class="operator">></span>setWordWrap(<span class="keyword">true</span>); profileLabel<span class="operator">-</span><span class="operator">></span>setAlignment(<span class="type"><a href="../qtcore/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="../qtwidgets/qlabel.html">QLabel</a></span>; titleLabel<span class="operator">-</span><span class="operator">></span>setWordWrap(<span class="keyword">true</span>); titleLabel<span class="operator">-</span><span class="operator">></span>setAlignment(<span class="type"><a href="../qtcore/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="../qtwidgets/qlabel.html">QLabel</a></span>(); iconLabel<span class="operator">-</span><span class="operator">></span>setAlignment(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignBottom <span class="operator">|</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignRight); iconLabel<span class="operator">-</span><span class="operator">></span>setPixmap(<span class="type">QPixmap</span>(<span class="string">":/images/icon.png"</span>)); imageLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qlabel.html">QLabel</a></span>; imageLabel<span class="operator">-</span><span class="operator">></span>setWordWrap(<span class="keyword">true</span>); imageLabel<span class="operator">-</span><span class="operator">></span>setAlignment(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignCenter); imageLabel<span class="operator">-</span><span class="operator">></span>setPixmap(<span class="type">QPixmap</span>(<span class="string">":/images/image.png"</span>)); trackList <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qlistwidget.html">QListWidget</a></span>; <span class="type"><a href="../qtwidgets/qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qgridlayout.html">QGridLayout</a></span>; layout<span class="operator">-</span><span class="operator">></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">></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">></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">></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">></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">></span>setRowStretch(<span class="number">2</span><span class="operator">,</span> <span class="number">1</span>); box<span class="operator">-</span><span class="operator">></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="../qtwidgets/qaction.html">QAction</a></span> <span class="operator">*</span>addAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span>(tr(<span class="string">"&Add album..."</span>)<span class="operator">,</span> <span class="keyword">this</span>); <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span> <span class="operator">*</span>deleteAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span>(tr(<span class="string">"&Delete album..."</span>)<span class="operator">,</span> <span class="keyword">this</span>); <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span> <span class="operator">*</span>quitAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span>(tr(<span class="string">"&Quit"</span>)<span class="operator">,</span> <span class="keyword">this</span>); <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span> <span class="operator">*</span>aboutAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span>(tr(<span class="string">"&About"</span>)<span class="operator">,</span> <span class="keyword">this</span>); <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span> <span class="operator">*</span>aboutQtAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span>(tr(<span class="string">"About &Qt"</span>)<span class="operator">,</span> <span class="keyword">this</span>); addAction<span class="operator">-</span><span class="operator">></span>setShortcut(tr(<span class="string">"Ctrl+A"</span>)); deleteAction<span class="operator">-</span><span class="operator">></span>setShortcut(tr(<span class="string">"Ctrl+D"</span>)); quitAction<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type">QKeySequence</span><span class="operator">::</span>Quit); <span class="type"><a href="../qtwidgets/qmenu.html">QMenu</a></span> <span class="operator">*</span>fileMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&File"</span>)); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(addAction); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(deleteAction); fileMenu<span class="operator">-</span><span class="operator">></span>addSeparator(); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(quitAction); <span class="type"><a href="../qtwidgets/qmenu.html">QMenu</a></span> <span class="operator">*</span>helpMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&Help"</span>)); helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutAction); helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutQtAction); connect(addAction<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>addAlbum); connect(deleteAction<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>deleteAlbum); connect(quitAction<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>close); connect(aboutAction<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>about); connect(aboutQtAction<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <a href="../qtwidgets/qapplication.html#qApp">qApp</a><span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qapplication.html">QApplication</a></span><span class="operator">::</span>aboutQt); } <span class="type">void</span> MainWindow<span class="operator">::</span>showImageLabel() { profileLabel<span class="operator">-</span><span class="operator">></span>hide(); titleLabel<span class="operator">-</span><span class="operator">></span>hide(); iconLabel<span class="operator">-</span><span class="operator">></span>hide(); trackList<span class="operator">-</span><span class="operator">></span>hide(); imageLabel<span class="operator">-</span><span class="operator">></span>show(); } <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> MainWindow<span class="operator">::</span>indexOfArtist(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</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">></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"><</span> artistModel<span class="operator">-</span><span class="operator">></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">></span>record(i); <span class="keyword">if</span> (record<span class="operator">.</span>value(<span class="string">"artist"</span>) <span class="operator">=</span><span class="operator">=</span> artist) <span class="keyword">return</span> artistModel<span class="operator">-</span><span class="operator">></span>index(i<span class="operator">,</span> <span class="number">1</span>); } <span class="keyword">return</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>(); } <span class="type">void</span> MainWindow<span class="operator">::</span>updateHeader(<span class="type"><a href="../qtcore/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">></span>hideColumn(<span class="number">0</span>); albumView<span class="operator">-</span><span class="operator">></span>horizontalHeader()<span class="operator">-</span><span class="operator">></span>setSectionResizeMode(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtwidgets/qheaderview.html">QHeaderView</a></span><span class="operator">::</span>Stretch); albumView<span class="operator">-</span><span class="operator">></span>resizeColumnToContents(<span class="number">2</span>); albumView<span class="operator">-</span><span class="operator">></span>resizeColumnToContents(<span class="number">3</span>); } <span class="type">void</span> MainWindow<span class="operator">::</span>about() { <span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>about(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"About Music Archive"</span>)<span class="operator">,</span> tr(<span class="string">"<p>The <b>Music Archive</b> example shows how to present "</span> <span class="string">"data from different data sources in the same application. "</span> <span class="string">"The album titles, and the corresponding artists and release dates, "</span> <span class="string">"are kept in a database, while each album's tracks are stored "</span> <span class="string">"in an XML file. </p><p>The example also shows how to add as "</span> <span class="string">"well as remove data from both the database and the "</span> <span class="string">"associated XML file using the API provided by the Qt SQL and "</span> <span class="string">"Qt XML modules, respectively.</p>"</span>)); } </pre> </div> <!-- @@@masterdetail/mainwindow.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>