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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from PySide6.QtWidgets import (QAbstractItemView, QDataWidgetMapper,
QHeaderView, QMainWindow, QMessageBox)
from PySide6.QtGui import QKeySequence
from PySide6.QtSql import QSqlRelation, QSqlRelationalTableModel, QSqlTableModel
from PySide6.QtCore import Qt, Slot
import createdb
from ui_bookwindow import Ui_BookWindow
from bookdelegate import BookDelegate
class BookWindow(QMainWindow, Ui_BookWindow):
"""A window to show the books available"""
def __init__(self):
super().__init__()
self.setupUi(self)
# Initialize db
createdb.init_db()
model = QSqlRelationalTableModel(self.bookTable)
model.setEditStrategy(QSqlTableModel.OnManualSubmit)
model.setTable("books")
# Remember the indexes of the columns:
author_idx = model.fieldIndex("author")
genre_idx = model.fieldIndex("genre")
# Set the relations to the other database tables:
model.setRelation(author_idx, QSqlRelation("authors", "id", "name"))
model.setRelation(genre_idx, QSqlRelation("genres", "id", "name"))
# Set the localized header captions:
model.setHeaderData(author_idx, Qt.Horizontal, self.tr("Author Name"))
model.setHeaderData(genre_idx, Qt.Horizontal, self.tr("Genre"))
model.setHeaderData(model.fieldIndex("title"), Qt.Horizontal, self.tr("Title"))
model.setHeaderData(model.fieldIndex("year"), Qt.Horizontal, self.tr("Year"))
model.setHeaderData(model.fieldIndex("rating"), Qt.Horizontal, self.tr("Rating"))
if not model.select():
print(model.lastError())
# Set the model and hide the ID column:
self.bookTable.setModel(model)
self.bookTable.setItemDelegate(BookDelegate(self.bookTable))
self.bookTable.setColumnHidden(model.fieldIndex("id"), True)
self.bookTable.setSelectionMode(QAbstractItemView.SingleSelection)
# Initialize the Author combo box:
self.authorEdit.setModel(model.relationModel(author_idx))
self.authorEdit.setModelColumn(model.relationModel(author_idx).fieldIndex("name"))
self.genreEdit.setModel(model.relationModel(genre_idx))
self.genreEdit.setModelColumn(model.relationModel(genre_idx).fieldIndex("name"))
# Lock and prohibit resizing of the width of the rating column:
self.bookTable.horizontalHeader().setSectionResizeMode(model.fieldIndex("rating"),
QHeaderView.ResizeToContents)
mapper = QDataWidgetMapper(self)
mapper.setModel(model)
mapper.setItemDelegate(BookDelegate(self))
mapper.addMapping(self.titleEdit, model.fieldIndex("title"))
mapper.addMapping(self.yearEdit, model.fieldIndex("year"))
mapper.addMapping(self.authorEdit, author_idx)
mapper.addMapping(self.genreEdit, genre_idx)
mapper.addMapping(self.ratingEdit, model.fieldIndex("rating"))
selection_model = self.bookTable.selectionModel()
selection_model.currentRowChanged.connect(mapper.setCurrentModelIndex)
self.bookTable.setCurrentIndex(model.index(0, 0))
self.create_menubar()
def showError(self, err):
QMessageBox.critical(self, "Unable to initialize Database",
f"Error initializing database: {err.text()}")
def create_menubar(self):
file_menu = self.menuBar().addMenu(self.tr("&File"))
quit_action = file_menu.addAction(self.tr("&Quit"))
quit_action.triggered.connect(qApp.quit) # noqa: F821
help_menu = self.menuBar().addMenu(self.tr("&Help"))
about_action = help_menu.addAction(self.tr("&About"))
about_action.setShortcut(QKeySequence.HelpContents)
about_action.triggered.connect(self.about)
aboutQt_action = help_menu.addAction("&About Qt")
aboutQt_action.triggered.connect(qApp.aboutQt) # noqa: F821
@Slot()
def about(self):
QMessageBox.about(self, self.tr("About Books"),
self.tr("<p>The <b>Books</b> example shows how to use Qt SQL classes "
"with a model/view framework."))
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