dialog.cpp Example File

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#include "dialog.h" int uniqueAlbumId; int uniqueArtistId; Dialog::Dialog(QSqlRelationalTableModel *albums, QDomDocument details, QFile *output, QWidget *parent) : QDialog(parent) { model = albums; albumDetails = details; outputFile = output; QGroupBox *inputWidgetBox = createInputWidgets(); QDialogButtonBox *buttonBox = createButtons(); QVBoxLayout *layout = new QVBoxLayout; layout->addWidget(inputWidgetBox); layout->addWidget(buttonBox); setLayout(layout); setWindowTitle(tr("Add Album")); } void Dialog::submit() { QString artist = artistEditor->text(); QString title = titleEditor->text(); if (artist.isEmpty() || title.isEmpty()) { QString message(tr("Please provide both the name of the artist " "and the title of the album.")); QMessageBox::information(this, tr("Add Album"), message); } else { int artistId = findArtistId(artist); int albumId = addNewAlbum(title, artistId); QStringList tracks; tracks = tracksEditor->text().split(',', QString::SkipEmptyParts); addTracks(albumId, tracks); increaseAlbumCount(indexOfArtist(artist)); accept(); } } int Dialog::findArtistId(const QString &artist) { QSqlTableModel *artistModel = model->relationModel(2); int row = 0; while (row < artistModel->rowCount()) { QSqlRecord record = artistModel->record(row); if (record.value("artist") == artist) return record.value("id").toInt(); else row++; } return addNewArtist(artist); } int Dialog::addNewArtist(const QString &name) { QSqlTableModel *artistModel = model->relationModel(2); QSqlRecord record; int id = generateArtistId(); QSqlField f1("id", QVariant::Int); QSqlField f2("artist", QVariant::String); QSqlField f3("albumcount", QVariant::Int); f1.setValue(QVariant(id)); f2.setValue(QVariant(name)); f3.setValue(QVariant(0)); record.append(f1); record.append(f2); record.append(f3); artistModel->insertRecord(-1, record); return id; } int Dialog::addNewAlbum(const QString &title, int artistId) { int id = generateAlbumId(); QSqlRecord record; QSqlField f1("albumid", QVariant::Int); QSqlField f2("title", QVariant::String); QSqlField f3("artistid", QVariant::Int); QSqlField f4("year", QVariant::Int); f1.setValue(QVariant(id)); f2.setValue(QVariant(title)); f3.setValue(QVariant(artistId)); f4.setValue(QVariant(yearEditor->value())); record.append(f1); record.append(f2); record.append(f3); record.append(f4); model->insertRecord(-1, record); return id; } void Dialog::addTracks(int albumId, const QStringList &tracks) { QDomElement albumNode = albumDetails.createElement("album"); albumNode.setAttribute("id", albumId); for (int i = 0; i < tracks.count(); ++i) { QString trackNumber = QString::number(i); if (i < 10) trackNumber.prepend('0'); QDomText textNode = albumDetails.createTextNode(tracks.at(i)); QDomElement trackNode = albumDetails.createElement("track"); trackNode.setAttribute("number", trackNumber); trackNode.appendChild(textNode); albumNode.appendChild(trackNode); } QDomNodeList archive = albumDetails.elementsByTagName("archive"); archive.item(0).appendChild(albumNode); /* 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 (!outputFile->open(QIODevice::WriteOnly)) { return; } else { QTextStream stream(outputFile); archive.item(0).save(stream, 4); outputFile->close(); } */ } void Dialog::increaseAlbumCount(QModelIndex artistIndex) { QSqlTableModel *artistModel = model->relationModel(2); QModelIndex albumCountIndex; albumCountIndex = artistIndex.sibling(artistIndex.row(), 2); int albumCount = albumCountIndex.data().toInt(); artistModel->setData(albumCountIndex, QVariant(albumCount + 1)); } void Dialog::revert() { artistEditor->clear(); titleEditor->clear(); yearEditor->setValue(QDate::currentDate().year()); tracksEditor->clear(); } QGroupBox *Dialog::createInputWidgets() { QGroupBox *box = new QGroupBox(tr("Add Album")); QLabel *artistLabel = new QLabel(tr("Artist:")); QLabel *titleLabel = new QLabel(tr("Title:")); QLabel *yearLabel = new QLabel(tr("Year:")); QLabel *tracksLabel = new QLabel(tr("Tracks (separated by comma):")); artistEditor = new QLineEdit; titleEditor = new QLineEdit; yearEditor = new QSpinBox; yearEditor->setMinimum(1900); yearEditor->setMaximum(QDate::currentDate().year()); yearEditor->setValue(yearEditor->maximum()); yearEditor->setReadOnly(false); tracksEditor = new QLineEdit; QGridLayout *layout = new QGridLayout; layout->addWidget(artistLabel, 0, 0); layout->addWidget(artistEditor, 0, 1); layout->addWidget(titleLabel, 1, 0); layout->addWidget(titleEditor, 1, 1); layout->addWidget(yearLabel, 2, 0); layout->addWidget(yearEditor, 2, 1); layout->addWidget(tracksLabel, 3, 0, 1, 2); layout->addWidget(tracksEditor, 4, 0, 1, 2); box->setLayout(layout); return box; } QDialogButtonBox *Dialog::createButtons() { QPushButton *closeButton = new QPushButton(tr("&Close")); QPushButton *revertButton = new QPushButton(tr("&Revert")); QPushButton *submitButton = new QPushButton(tr("&Submit")); closeButton->setDefault(true); connect(closeButton, &QPushButton::clicked, this, &Dialog::close); connect(revertButton, &QPushButton::clicked, this, &Dialog::revert); connect(submitButton, &QPushButton::clicked, this, &Dialog::submit); QDialogButtonBox *buttonBox = new QDialogButtonBox; buttonBox->addButton(submitButton, QDialogButtonBox::ResetRole); buttonBox->addButton(revertButton, QDialogButtonBox::ResetRole); buttonBox->addButton(closeButton, QDialogButtonBox::RejectRole); return buttonBox; } QModelIndex Dialog::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(); } int Dialog::generateArtistId() { uniqueArtistId += 1; return uniqueArtistId; } int Dialog::generateAlbumId() { uniqueAlbumId += 1; return uniqueAlbumId; }

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