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| |
| #include "bookwindow.h" |
| #include "bookdelegate.h" |
| #include "initdb.h" |
| |
| #include <QtSql> |
| |
| BookWindow::BookWindow() |
| { |
| ui.setupUi(this); |
| |
| if (!QSqlDatabase::drivers().contains("QSQLITE")) |
| QMessageBox::critical( |
| this, |
| "Unable to load database", |
| "This demo needs the SQLITE driver" |
| ); |
| |
| // Initialize the database: |
| QSqlError err = initDb(); |
| if (err.type() != QSqlError::NoError) { |
| showError(err); |
| return; |
| } |
| |
| // Create the data model: |
| model = new QSqlRelationalTableModel(ui.bookTable); |
| model->setEditStrategy(QSqlTableModel::OnManualSubmit); |
| model->setTable("books"); |
| |
| // Remember the indexes of the columns: |
| authorIdx = model->fieldIndex("author"); |
| genreIdx = model->fieldIndex("genre"); |
| |
| // Set the relations to the other database tables: |
| model->setRelation(authorIdx, QSqlRelation("authors", "id", "name")); |
| model->setRelation(genreIdx, QSqlRelation("genres", "id", "name")); |
| |
| // Set the localized header captions: |
| model->setHeaderData(authorIdx, Qt::Horizontal, tr("Author Name")); |
| model->setHeaderData(genreIdx, Qt::Horizontal, tr("Genre")); |
| model->setHeaderData(model->fieldIndex("title"), |
| Qt::Horizontal, tr("Title")); |
| model->setHeaderData(model->fieldIndex("year"), Qt::Horizontal, tr("Year")); |
| model->setHeaderData(model->fieldIndex("rating"), |
| Qt::Horizontal, tr("Rating")); |
| |
| // Populate the model: |
| if (!model->select()) { |
| showError(model->lastError()); |
| return; |
| } |
| |
| // Set the model and hide the ID column: |
| ui.bookTable->setModel(model); |
| ui.bookTable->setItemDelegate(new BookDelegate(ui.bookTable)); |
| ui.bookTable->setColumnHidden(model->fieldIndex("id"), true); |
| ui.bookTable->setSelectionMode(QAbstractItemView::SingleSelection); |
| |
| // Initialize the Author combo box: |
| ui.authorEdit->setModel(model->relationModel(authorIdx)); |
| ui.authorEdit->setModelColumn( |
| model->relationModel(authorIdx)->fieldIndex("name")); |
| |
| ui.genreEdit->setModel(model->relationModel(genreIdx)); |
| ui.genreEdit->setModelColumn( |
| model->relationModel(genreIdx)->fieldIndex("name")); |
| |
| // Lock and prohibit resizing of the width of the rating column: |
| ui.bookTable->horizontalHeader()->setSectionResizeMode( |
| model->fieldIndex("rating"), |
| QHeaderView::ResizeToContents); |
| |
| QDataWidgetMapper *mapper = new QDataWidgetMapper(this); |
| mapper->setModel(model); |
| mapper->setItemDelegate(new BookDelegate(this)); |
| mapper->addMapping(ui.titleEdit, model->fieldIndex("title")); |
| mapper->addMapping(ui.yearEdit, model->fieldIndex("year")); |
| mapper->addMapping(ui.authorEdit, authorIdx); |
| mapper->addMapping(ui.genreEdit, genreIdx); |
| mapper->addMapping(ui.ratingEdit, model->fieldIndex("rating")); |
| |
| connect(ui.bookTable->selectionModel(), |
| &QItemSelectionModel::currentRowChanged, |
| mapper, |
| &QDataWidgetMapper::setCurrentModelIndex |
| ); |
| |
| ui.bookTable->setCurrentIndex(model->index(0, 0)); |
| createMenuBar(); |
| } |
| |
| void BookWindow::showError(const QSqlError &err) |
| { |
| QMessageBox::critical(this, "Unable to initialize Database", |
| "Error initializing database: " + err.text()); |
| } |
| |
| void BookWindow::createMenuBar() |
| { |
| QAction *quitAction = new QAction(tr("&Quit"), this); |
| QAction *aboutAction = new QAction(tr("&About"), this); |
| QAction *aboutQtAction = new QAction(tr("&About Qt"), this); |
| |
| QMenu *fileMenu = menuBar()->addMenu(tr("&File")); |
| fileMenu->addAction(quitAction); |
| |
| QMenu *helpMenu = menuBar()->addMenu(tr("&Help")); |
| helpMenu->addAction(aboutAction); |
| helpMenu->addAction(aboutQtAction); |
| |
| connect(quitAction, &QAction::triggered, this, &BookWindow::close); |
| connect(aboutAction, &QAction::triggered, this, &BookWindow::about); |
| connect(aboutQtAction, &QAction::triggered, qApp, &QApplication::aboutQt); |
| } |
| |
| void BookWindow::about() |
| { |
| QMessageBox::about(this, tr("About Books"), |
| tr("<p>The <b>Books</b> example shows how to use Qt SQL classes " |
| "with a model/view framework.")); |
| } |