Long live Qt!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "mainwindow.h"
+#include "dialog.h"
+
+#include <QtGui>
+#include <QtSql>
+#include <QtXml>
+
+extern int uniqueAlbumId;
+extern int uniqueArtistId;
+
+MainWindow::MainWindow(const QString &artistTable, const QString &albumTable,
+                       QFile *albumDetails, QWidget *parent)
+     : QMainWindow(parent)
+{
+    file = albumDetails;
+    readAlbumData();
+
+    model = new QSqlRelationalTableModel(this);
+    model->setTable(albumTable);
+    model->setRelation(2, QSqlRelation(artistTable, "id", "artist"));
+    model->select();
+
+    QGroupBox *artists = createArtistGroupBox();
+    QGroupBox *albums = createAlbumGroupBox();
+    QGroupBox *details = createDetailsGroupBox();
+
+    artistView->setCurrentIndex(0);
+    uniqueAlbumId = model->rowCount();
+    uniqueArtistId = artistView->count();
+
+    connect(model, SIGNAL(rowsInserted(QModelIndex, int, int)),
+            this, SLOT(updateHeader(QModelIndex, int, int)));
+    connect(model, SIGNAL(rowsRemoved(QModelIndex, int, int)),
+            this, SLOT(updateHeader(QModelIndex, int, int)));
+
+    QGridLayout *layout = new QGridLayout;
+    layout->addWidget(artists, 0, 0);
+    layout->addWidget(albums, 1, 0);
+    layout->addWidget(details, 0, 1, 2, 1);
+    layout->setColumnStretch(1, 1);
+    layout->setColumnMinimumWidth(0, 500);
+
+    QWidget *widget = new QWidget;
+    widget->setLayout(layout);
+    setCentralWidget(widget);
+    createMenuBar();
+
+    showImageLabel();
+    resize(850, 400);
+    setWindowTitle(tr("Music Archive"));
+}
+
+void MainWindow::changeArtist(int row)
+{
+    if (row > 0) {
+        QModelIndex index = model->relationModel(2)->index(row, 1);
+        model->setFilter("artist = '" + index.data().toString() + '\'') ;
+        showArtistProfile(index);
+    } else if (row == 0) {
+        model->setFilter(QString());
+        showImageLabel();
+    } else {
+        return;
+    }
+}
+
+void MainWindow::showArtistProfile(QModelIndex index)
+{
+    QSqlRecord record = model->relationModel(2)->record(index.row());
+
+    QString name = record.value("artist").toString();
+    QString count = record.value("albumcount").toString();
+    profileLabel->setText(tr("Artist : %1 \n" \
+                             "Number of Albums: %2").arg(name).arg(count));
+
+    profileLabel->show();
+    iconLabel->show();
+
+    titleLabel->hide();
+    trackList->hide();
+    imageLabel->hide();
+}
+
+void MainWindow::showAlbumDetails(QModelIndex index)
+{
+    QSqlRecord record = model->record(index.row());
+
+    QString artist = record.value("artist").toString();
+    QString title = record.value("title").toString();
+    QString year = record.value("year").toString();
+    QString albumId = record.value("albumid").toString();
+
+    showArtistProfile(indexOfArtist(artist));
+    titleLabel->setText(tr("Title: %1 (%2)").arg(title).arg(year));
+    titleLabel->show();
+
+    QDomNodeList albums = albumData.elementsByTagName("album");
+    for (int i = 0; i < albums.count(); i++) {
+        QDomNode album = albums.item(i);
+        if (album.toElement().attribute("id") == albumId) {
+            getTrackList(album.toElement());
+            break;
+        }
+    }
+    if (!trackList->count() == 0)
+        trackList->show();
+}
+
+void MainWindow::getTrackList(QDomNode album)
+{
+    trackList->clear();
+
+    QDomNodeList tracks = album.childNodes();
+    QDomNode track;
+    QString trackNumber;
+
+    for (int j = 0; j < tracks.count(); j++) {
+
+        track = tracks.item(j);
+        trackNumber = track.toElement().attribute("number");
+
+        QListWidgetItem *item = new QListWidgetItem(trackList);
+        item->setText(trackNumber + ": " + track.toElement().text());
+    }
+}
+
+void MainWindow::addAlbum()
+{
+    Dialog *dialog = new Dialog(model, albumData, file, this);
+    int accepted = dialog->exec();
+
+    if (accepted == 1) {
+        int lastRow = model->rowCount() - 1;
+        albumView->selectRow(lastRow);
+        albumView->scrollToBottom();
+        showAlbumDetails(model->index(lastRow, 0));
+    }
+}
+
+void MainWindow::deleteAlbum()
+{
+    QModelIndexList selection = albumView->selectionModel()->selectedRows(0);
+
+    if (!selection.empty()) {
+        QModelIndex idIndex = selection.at(0);
+        int id = idIndex.data().toInt();
+        QString title = idIndex.sibling(idIndex.row(), 1).data().toString();
+        QString artist = idIndex.sibling(idIndex.row(), 2).data().toString();
+
+        QMessageBox::StandardButton button;
+        button = QMessageBox::question(this, tr("Delete Album"),
+                                       QString(tr("Are you sure you want to " \
+                                                  "delete '%1' by '%2'?"))
+                                              .arg(title).arg(artist),
+                                       QMessageBox::Yes | QMessageBox::No);
+
+        if (button == QMessageBox::Yes) {
+            removeAlbumFromFile(id);
+            removeAlbumFromDatabase(idIndex);
+            decreaseAlbumCount(indexOfArtist(artist));
+
+            showImageLabel();
+        }
+    } else {
+        QMessageBox::information(this, tr("Delete Album"),
+                                 tr("Select the album you want to delete."));
+    }
+}
+
+void MainWindow::removeAlbumFromFile(int id)
+{
+
+    QDomNodeList albums = albumData.elementsByTagName("album");
+
+    for (int i = 0; i < albums.count(); i++) {
+        QDomNode node = albums.item(i);
+        if (node.toElement().attribute("id").toInt() == id) {
+            albumData.elementsByTagName("archive").item(0).removeChild(node);
+            break;
+        }
+    }
+/*
+    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();
+    }
+*/
+}
+
+void MainWindow::removeAlbumFromDatabase(QModelIndex index)
+{
+    model->removeRow(index.row());
+}
+
+void MainWindow::decreaseAlbumCount(QModelIndex artistIndex)
+{
+    int row = artistIndex.row();
+    QModelIndex albumCountIndex = artistIndex.sibling(row, 2);
+    int albumCount = albumCountIndex.data().toInt();
+
+    QSqlTableModel *artists = model->relationModel(2);
+
+    if (albumCount == 1) {
+        artists->removeRow(row);
+        showImageLabel();
+    } else {
+        artists->setData(albumCountIndex, QVariant(albumCount - 1));
+    }
+}
+
+void MainWindow::readAlbumData()
+{
+    if (!file->open(QIODevice::ReadOnly))
+        return;
+
+    if (!albumData.setContent(file)) {
+        file->close();
+        return;
+    }
+    file->close();
+}
+
+QGroupBox* MainWindow::createArtistGroupBox()
+{
+    artistView = new QComboBox;
+    artistView->setModel(model->relationModel(2));
+    artistView->setModelColumn(1);
+
+    connect(artistView, SIGNAL(currentIndexChanged(int)),
+            this, SLOT(changeArtist(int)));
+
+    QGroupBox *box = new QGroupBox(tr("Artist"));
+
+    QGridLayout *layout = new QGridLayout;
+    layout->addWidget(artistView, 0, 0);
+    box->setLayout(layout);
+
+    return box;
+}
+
+QGroupBox* MainWindow::createAlbumGroupBox()
+{
+    QGroupBox *box = new QGroupBox(tr("Album"));
+
+    albumView = new QTableView;
+    albumView->setEditTriggers(QAbstractItemView::NoEditTriggers);
+    albumView->setSortingEnabled(true);
+    albumView->setSelectionBehavior(QAbstractItemView::SelectRows);
+    albumView->setSelectionMode(QAbstractItemView::SingleSelection);
+    albumView->setShowGrid(false);
+    albumView->verticalHeader()->hide();
+    albumView->setAlternatingRowColors(true);
+    albumView->setModel(model);
+    adjustHeader();
+
+    QLocale locale = albumView->locale();
+    locale.setNumberOptions(QLocale::OmitGroupSeparator);
+    albumView->setLocale(locale);
+
+    connect(albumView, SIGNAL(clicked(QModelIndex)),
+            this, SLOT(showAlbumDetails(QModelIndex)));
+    connect(albumView, SIGNAL(activated(QModelIndex)),
+            this, SLOT(showAlbumDetails(QModelIndex)));
+
+    QVBoxLayout *layout = new QVBoxLayout;
+    layout->addWidget(albumView, 0, 0);
+    box->setLayout(layout);
+
+    return box;
+}
+
+QGroupBox* MainWindow::createDetailsGroupBox()
+{
+    QGroupBox *box = new QGroupBox(tr("Details"));
+
+    profileLabel = new QLabel;
+    profileLabel->setWordWrap(true);
+    profileLabel->setAlignment(Qt::AlignBottom);
+
+    titleLabel = new QLabel;
+    titleLabel->setWordWrap(true);
+    titleLabel->setAlignment(Qt::AlignBottom);
+
+    iconLabel = new QLabel();
+    iconLabel->setAlignment(Qt::AlignBottom | Qt::AlignRight);
+    iconLabel->setPixmap(QPixmap(":/images/icon.png"));
+
+    imageLabel = new QLabel;
+    imageLabel->setWordWrap(true);
+    imageLabel->setAlignment(Qt::AlignCenter);
+    imageLabel->setPixmap(QPixmap(":/images/image.png"));
+
+    trackList = new QListWidget;
+
+    QGridLayout *layout = new QGridLayout;
+    layout->addWidget(imageLabel, 0, 0, 3, 2);
+    layout->addWidget(profileLabel, 0, 0);
+    layout->addWidget(iconLabel, 0, 1);
+    layout->addWidget(titleLabel, 1, 0, 1, 2);
+    layout->addWidget(trackList, 2, 0, 1, 2);
+    layout->setRowStretch(2, 1);
+    box->setLayout(layout);
+
+    return box;
+}
+
+void MainWindow::createMenuBar()
+{
+    QAction *addAction = new QAction(tr("&Add album..."), this);
+    QAction *deleteAction = new QAction(tr("&Delete album..."), this);
+    QAction *quitAction = new QAction(tr("&Quit"), this);
+    QAction *aboutAction = new QAction(tr("&About"), this);
+    QAction *aboutQtAction = new QAction(tr("About &Qt"), this);
+
+    addAction->setShortcut(tr("Ctrl+A"));
+    deleteAction->setShortcut(tr("Ctrl+D"));
+    quitAction->setShortcut(tr("Ctrl+Q"));
+
+    QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
+    fileMenu->addAction(addAction);
+    fileMenu->addAction(deleteAction);
+    fileMenu->addSeparator();
+    fileMenu->addAction(quitAction);
+
+    QMenu *helpMenu = menuBar()->addMenu(tr("&Help"));
+    helpMenu->addAction(aboutAction);
+    helpMenu->addAction(aboutQtAction);
+
+    connect(addAction, SIGNAL(triggered(bool)), this, SLOT(addAlbum()));
+    connect(deleteAction, SIGNAL(triggered(bool)), this, SLOT(deleteAlbum()));
+    connect(quitAction, SIGNAL(triggered(bool)), this, SLOT(close()));
+    connect(aboutAction, SIGNAL(triggered(bool)), this, SLOT(about()));
+    connect(aboutQtAction, SIGNAL(triggered(bool)), qApp, SLOT(aboutQt()));
+}
+
+void MainWindow::showImageLabel()
+{
+    profileLabel->hide();
+    titleLabel->hide();
+    iconLabel->hide();
+    trackList->hide();
+
+    imageLabel->show();
+}
+
+QModelIndex MainWindow::indexOfArtist(const QString &artist)
+{
+    QSqlTableModel *artistModel = model->relationModel(2);
+
+    for (int i = 0; i < artistModel->rowCount(); i++) {
+        QSqlRecord record =  artistModel->record(i);
+        if (record.value("artist") == artist)
+            return artistModel->index(i, 1);
+    }
+    return QModelIndex();
+}
+
+void MainWindow::updateHeader(QModelIndex, int, int)
+{
+    adjustHeader();
+}
+
+void MainWindow::adjustHeader()
+{
+    albumView->hideColumn(0);
+    albumView->horizontalHeader()->setResizeMode(1, QHeaderView::Stretch);
+    albumView->resizeColumnToContents(2);
+    albumView->resizeColumnToContents(3);
+}
+
+void MainWindow::about()
+{
+    QMessageBox::about(this, tr("About Music Archive"),
+            tr("<p>The <b>Music Archive</b> example shows how to present "
+               "data from different data sources in the same application. "
+               "The album titles, and the corresponding artists and release dates, "
+               "are kept in a database, while each album's tracks are stored "
+               "in an XML file. </p><p>The example also shows how to add as "
+               "well as remove data from both the database and the "
+               "associated XML file using the API provided by the QtSql and "
+               "QtXml modules, respectively.</p>"));
+}