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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#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."));
+}