bookwindow.cpp Example File
demos/books/bookwindow.cpp
/****************************************************************************
**
** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
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** This file is part of the documentation of the Qt Toolkit.
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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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->setTable("books");
// Remeber 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);
// 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"));
connect(model, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
this, SLOT(dataChanged(QModelIndex)));
connect(ui.bookTable->selectionModel(), SIGNAL(currentRowChanged(QModelIndex,QModelIndex)),
this, SLOT(currentBookChanged(QModelIndex)));
}
void BookWindow::showError(const QSqlError &err)
{
QMessageBox::critical(this, "Unable to initialize Database",
"Error initializing database: " + err.text());
}
void BookWindow::currentBookChanged(const QModelIndex &index)
{
bool enabled = index.isValid();
ui.titleEdit->setEnabled(enabled);
ui.yearEdit->setEnabled(enabled);
ui.authorEdit->setEnabled(enabled);
ui.genreEdit->setEnabled(enabled);
ui.ratingEdit->setEnabled(enabled);
QSqlRecord rec = model->record(index.row());
ui.titleEdit->setText(rec.value("title").toString());
ui.yearEdit->setValue(rec.value("year").toInt());
ui.authorEdit->setCurrentIndex(ui.authorEdit->findText(rec.value(authorIdx).toString()));
ui.genreEdit->setCurrentIndex(ui.genreEdit->findText(rec.value(genreIdx).toString()));
ui.ratingEdit->setCurrentIndex(rec.value("rating").toInt());
}
void BookWindow::on_authorEdit_activated(const QString &text)
{
QModelIndex currentIndex = model->index(ui.bookTable->currentIndex().row(), authorIdx);
if (model->data(currentIndex).toString() != text)
ui.bookTable->itemDelegate()->setModelData(ui.authorEdit, model, currentIndex);
}
void BookWindow::on_genreEdit_activated(const QString &text)
{
QModelIndex currentIndex = model->index(ui.bookTable->currentIndex().row(), genreIdx);
if (model->data(currentIndex).toString() != text)
ui.bookTable->itemDelegate()->setModelData(ui.genreEdit, model, currentIndex);
}
void BookWindow::on_ratingEdit_activated(int value)
{
QModelIndex currentIndex = model->index(ui.bookTable->currentIndex().row(),
model->fieldIndex("rating"));
if (model->data(currentIndex).toInt() != value)
model->setData(currentIndex, value);
}
void BookWindow::on_titleEdit_textChanged(const QString &text)
{
QModelIndex currentIndex = model->index(ui.bookTable->currentIndex().row(),
model->fieldIndex("title"));
if (model->data(currentIndex).toString() != text)
model->setData(currentIndex, text);
}
void BookWindow::on_yearEdit_valueChanged(int value)
{
QModelIndex currentIndex = model->index(ui.bookTable->currentIndex().row(),
model->fieldIndex("year"));
if (model->data(currentIndex).toInt() != value)
model->setData(currentIndex, value);
}
void BookWindow::dataChanged(const QModelIndex &index)
{
if (index.row() == ui.bookTable->currentIndex().row())
currentBookChanged(index);
}