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50
51#include "bookwindow.h"
52#include "bookdelegate.h"
53#include "initdb.h"
54
55#include <QtSql>
56
57BookWindow::BookWindow()
58{
59 ui.setupUi(this);
60
61 if (!QSqlDatabase::drivers().contains("QSQLITE"))
62 QMessageBox::critical(
63 this,
64 "Unable to load database",
65 "This demo needs the SQLITE driver"
66 );
67
68 // Initialize the database:
69 QSqlError err = initDb();
70 if (err.type() != QSqlError::NoError) {
71 showError(err);
72 return;
73 }
74
75 // Create the data model:
76 model = new QSqlRelationalTableModel(ui.bookTable);
77 model->setEditStrategy(QSqlTableModel::OnManualSubmit);
78 model->setTable("books");
79
80 // Remember the indexes of the columns:
81 authorIdx = model->fieldIndex("author");
82 genreIdx = model->fieldIndex("genre");
83
84 // Set the relations to the other database tables:
85 model->setRelation(authorIdx, QSqlRelation("authors", "id", "name"));
86 model->setRelation(genreIdx, QSqlRelation("genres", "id", "name"));
87
88 // Set the localized header captions:
89 model->setHeaderData(authorIdx, Qt::Horizontal, tr("Author Name"));
90 model->setHeaderData(genreIdx, Qt::Horizontal, tr("Genre"));
91 model->setHeaderData(model->fieldIndex("title"),
92 Qt::Horizontal, tr("Title"));
93 model->setHeaderData(model->fieldIndex("year"), Qt::Horizontal, tr("Year"));
94 model->setHeaderData(model->fieldIndex("rating"),
95 Qt::Horizontal, tr("Rating"));
96
97 // Populate the model:
98 if (!model->select()) {
99 showError(model->lastError());
100 return;
101 }
102
103 // Set the model and hide the ID column:
104 ui.bookTable->setModel(model);
105 ui.bookTable->setItemDelegate(new BookDelegate(ui.bookTable));
106 ui.bookTable->setColumnHidden(model->fieldIndex("id"), true);
107 ui.bookTable->setSelectionMode(QAbstractItemView::SingleSelection);
108
109 // Initialize the Author combo box:
110 ui.authorEdit->setModel(model->relationModel(authorIdx));
111 ui.authorEdit->setModelColumn(
112 model->relationModel(authorIdx)->fieldIndex("name"));
113
114 ui.genreEdit->setModel(model->relationModel(genreIdx));
115 ui.genreEdit->setModelColumn(
116 model->relationModel(genreIdx)->fieldIndex("name"));
117
118 // Lock and prohibit resizing of the width of the rating column:
119 ui.bookTable->horizontalHeader()->setSectionResizeMode(
120 model->fieldIndex("rating"),
121 QHeaderView::ResizeToContents);
122
123 QDataWidgetMapper *mapper = new QDataWidgetMapper(this);
124 mapper->setModel(model);
125 mapper->setItemDelegate(new BookDelegate(this));
126 mapper->addMapping(ui.titleEdit, model->fieldIndex("title"));
127 mapper->addMapping(ui.yearEdit, model->fieldIndex("year"));
128 mapper->addMapping(ui.authorEdit, authorIdx);
129 mapper->addMapping(ui.genreEdit, genreIdx);
130 mapper->addMapping(ui.ratingEdit, model->fieldIndex("rating"));
131
132 connect(ui.bookTable->selectionModel(),
133 &QItemSelectionModel::currentRowChanged,
134 mapper,
135 &QDataWidgetMapper::setCurrentModelIndex
136 );
137
138 ui.bookTable->setCurrentIndex(model->index(0, 0));
139 createMenuBar();
140}
141
142void BookWindow::showError(const QSqlError &err)
143{
144 QMessageBox::critical(this, "Unable to initialize Database",
145 "Error initializing database: " + err.text());
146}
147
148void BookWindow::createMenuBar()
149{
150 QAction *quitAction = new QAction(tr("&Quit"), this);
151 QAction *aboutAction = new QAction(tr("&About"), this);
152 QAction *aboutQtAction = new QAction(tr("&About Qt"), this);
153
154 QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
155 fileMenu->addAction(quitAction);
156
157 QMenu *helpMenu = menuBar()->addMenu(tr("&Help"));
158 helpMenu->addAction(aboutAction);
159 helpMenu->addAction(aboutQtAction);
160
161 connect(quitAction, &QAction::triggered, this, &BookWindow::close);
162 connect(aboutAction, &QAction::triggered, this, &BookWindow::about);
163 connect(aboutQtAction, &QAction::triggered, qApp, &QApplication::aboutQt);
164}
165
166void BookWindow::about()
167{
168 QMessageBox::about(this, tr("About Books"),
169 tr("<p>The <b>Books</b> example shows how to use Qt SQL classes "
170 "with a model/view framework."));
171}
172