qt5base-lts/examples/sql/masterdetail/mainwindow.cpp
Jason McDonald 5635823e17 Remove "All rights reserved" line from license headers.
As in the past, to avoid rewriting various autotests that contain
line-number information, an extra blank line has been inserted at the
end of the license text to ensure that this commit does not change the
total number of lines in the license header.

Change-Id: I311e001373776812699d6efc045b5f742890c689
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
2012-01-30 03:54:59 +01:00

430 lines
14 KiB
C++

/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "mainwindow.h"
#include "dialog.h"
#include <QtWidgets>
#include <QtSql>
#include <QtXml>
extern int uniqueAlbumId;
extern int uniqueArtistId;
MainWindow::MainWindow(const QString &artistTable, const QString &albumTable,
QFile *albumDetails, QWidget *parent)
: QMainWindow(parent)
{
file = albumDetails;
readAlbumData();
model = new QSqlRelationalTableModel(this);
model->setTable(albumTable);
model->setRelation(2, QSqlRelation(artistTable, "id", "artist"));
model->select();
QGroupBox *artists = createArtistGroupBox();
QGroupBox *albums = createAlbumGroupBox();
QGroupBox *details = createDetailsGroupBox();
artistView->setCurrentIndex(0);
uniqueAlbumId = model->rowCount();
uniqueArtistId = artistView->count();
connect(model, SIGNAL(rowsInserted(QModelIndex,int,int)),
this, SLOT(updateHeader(QModelIndex,int,int)));
connect(model, SIGNAL(rowsRemoved(QModelIndex,int,int)),
this, SLOT(updateHeader(QModelIndex,int,int)));
QGridLayout *layout = new QGridLayout;
layout->addWidget(artists, 0, 0);
layout->addWidget(albums, 1, 0);
layout->addWidget(details, 0, 1, 2, 1);
layout->setColumnStretch(1, 1);
layout->setColumnMinimumWidth(0, 500);
QWidget *widget = new QWidget;
widget->setLayout(layout);
setCentralWidget(widget);
createMenuBar();
showImageLabel();
resize(850, 400);
setWindowTitle(tr("Music Archive"));
}
void MainWindow::changeArtist(int row)
{
if (row > 0) {
QModelIndex index = model->relationModel(2)->index(row, 1);
model->setFilter("artist = '" + index.data().toString() + '\'') ;
showArtistProfile(index);
} else if (row == 0) {
model->setFilter(QString());
showImageLabel();
} else {
return;
}
}
void MainWindow::showArtistProfile(QModelIndex index)
{
QSqlRecord record = model->relationModel(2)->record(index.row());
QString name = record.value("artist").toString();
QString count = record.value("albumcount").toString();
profileLabel->setText(tr("Artist : %1 \n" \
"Number of Albums: %2").arg(name).arg(count));
profileLabel->show();
iconLabel->show();
titleLabel->hide();
trackList->hide();
imageLabel->hide();
}
void MainWindow::showAlbumDetails(QModelIndex index)
{
QSqlRecord record = model->record(index.row());
QString artist = record.value("artist").toString();
QString title = record.value("title").toString();
QString year = record.value("year").toString();
QString albumId = record.value("albumid").toString();
showArtistProfile(indexOfArtist(artist));
titleLabel->setText(tr("Title: %1 (%2)").arg(title).arg(year));
titleLabel->show();
QDomNodeList albums = albumData.elementsByTagName("album");
for (int i = 0; i < albums.count(); i++) {
QDomNode album = albums.item(i);
if (album.toElement().attribute("id") == albumId) {
getTrackList(album.toElement());
break;
}
}
if (!trackList->count() == 0)
trackList->show();
}
void MainWindow::getTrackList(QDomNode album)
{
trackList->clear();
QDomNodeList tracks = album.childNodes();
QDomNode track;
QString trackNumber;
for (int j = 0; j < tracks.count(); j++) {
track = tracks.item(j);
trackNumber = track.toElement().attribute("number");
QListWidgetItem *item = new QListWidgetItem(trackList);
item->setText(trackNumber + ": " + track.toElement().text());
}
}
void MainWindow::addAlbum()
{
Dialog *dialog = new Dialog(model, albumData, file, this);
int accepted = dialog->exec();
if (accepted == 1) {
int lastRow = model->rowCount() - 1;
albumView->selectRow(lastRow);
albumView->scrollToBottom();
showAlbumDetails(model->index(lastRow, 0));
}
}
void MainWindow::deleteAlbum()
{
QModelIndexList selection = albumView->selectionModel()->selectedRows(0);
if (!selection.empty()) {
QModelIndex idIndex = selection.at(0);
int id = idIndex.data().toInt();
QString title = idIndex.sibling(idIndex.row(), 1).data().toString();
QString artist = idIndex.sibling(idIndex.row(), 2).data().toString();
QMessageBox::StandardButton button;
button = QMessageBox::question(this, tr("Delete Album"),
tr("Are you sure you want to "
"delete '%1' by '%2'?")
.arg(title, artist),
QMessageBox::Yes | QMessageBox::No);
if (button == QMessageBox::Yes) {
removeAlbumFromFile(id);
removeAlbumFromDatabase(idIndex);
decreaseAlbumCount(indexOfArtist(artist));
showImageLabel();
}
} else {
QMessageBox::information(this, tr("Delete Album"),
tr("Select the album you want to delete."));
}
}
void MainWindow::removeAlbumFromFile(int id)
{
QDomNodeList albums = albumData.elementsByTagName("album");
for (int i = 0; i < albums.count(); i++) {
QDomNode node = albums.item(i);
if (node.toElement().attribute("id").toInt() == id) {
albumData.elementsByTagName("archive").item(0).removeChild(node);
break;
}
}
/*
The following code is commented out since the example uses an in
memory database, i.e., altering the XML file will bring the data
out of sync.
if (!file->open(QIODevice::WriteOnly)) {
return;
} else {
QTextStream stream(file);
albumData.elementsByTagName("archive").item(0).save(stream, 4);
file->close();
}
*/
}
void MainWindow::removeAlbumFromDatabase(QModelIndex index)
{
model->removeRow(index.row());
}
void MainWindow::decreaseAlbumCount(QModelIndex artistIndex)
{
int row = artistIndex.row();
QModelIndex albumCountIndex = artistIndex.sibling(row, 2);
int albumCount = albumCountIndex.data().toInt();
QSqlTableModel *artists = model->relationModel(2);
if (albumCount == 1) {
artists->removeRow(row);
showImageLabel();
} else {
artists->setData(albumCountIndex, QVariant(albumCount - 1));
}
}
void MainWindow::readAlbumData()
{
if (!file->open(QIODevice::ReadOnly))
return;
if (!albumData.setContent(file)) {
file->close();
return;
}
file->close();
}
QGroupBox* MainWindow::createArtistGroupBox()
{
artistView = new QComboBox;
artistView->setModel(model->relationModel(2));
artistView->setModelColumn(1);
connect(artistView, SIGNAL(currentIndexChanged(int)),
this, SLOT(changeArtist(int)));
QGroupBox *box = new QGroupBox(tr("Artist"));
QGridLayout *layout = new QGridLayout;
layout->addWidget(artistView, 0, 0);
box->setLayout(layout);
return box;
}
QGroupBox* MainWindow::createAlbumGroupBox()
{
QGroupBox *box = new QGroupBox(tr("Album"));
albumView = new QTableView;
albumView->setEditTriggers(QAbstractItemView::NoEditTriggers);
albumView->setSortingEnabled(true);
albumView->setSelectionBehavior(QAbstractItemView::SelectRows);
albumView->setSelectionMode(QAbstractItemView::SingleSelection);
albumView->setShowGrid(false);
albumView->verticalHeader()->hide();
albumView->setAlternatingRowColors(true);
albumView->setModel(model);
adjustHeader();
QLocale locale = albumView->locale();
locale.setNumberOptions(QLocale::OmitGroupSeparator);
albumView->setLocale(locale);
connect(albumView, SIGNAL(clicked(QModelIndex)),
this, SLOT(showAlbumDetails(QModelIndex)));
connect(albumView, SIGNAL(activated(QModelIndex)),
this, SLOT(showAlbumDetails(QModelIndex)));
QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(albumView, 0, 0);
box->setLayout(layout);
return box;
}
QGroupBox* MainWindow::createDetailsGroupBox()
{
QGroupBox *box = new QGroupBox(tr("Details"));
profileLabel = new QLabel;
profileLabel->setWordWrap(true);
profileLabel->setAlignment(Qt::AlignBottom);
titleLabel = new QLabel;
titleLabel->setWordWrap(true);
titleLabel->setAlignment(Qt::AlignBottom);
iconLabel = new QLabel();
iconLabel->setAlignment(Qt::AlignBottom | Qt::AlignRight);
iconLabel->setPixmap(QPixmap(":/images/icon.png"));
imageLabel = new QLabel;
imageLabel->setWordWrap(true);
imageLabel->setAlignment(Qt::AlignCenter);
imageLabel->setPixmap(QPixmap(":/images/image.png"));
trackList = new QListWidget;
QGridLayout *layout = new QGridLayout;
layout->addWidget(imageLabel, 0, 0, 3, 2);
layout->addWidget(profileLabel, 0, 0);
layout->addWidget(iconLabel, 0, 1);
layout->addWidget(titleLabel, 1, 0, 1, 2);
layout->addWidget(trackList, 2, 0, 1, 2);
layout->setRowStretch(2, 1);
box->setLayout(layout);
return box;
}
void MainWindow::createMenuBar()
{
QAction *addAction = new QAction(tr("&Add album..."), this);
QAction *deleteAction = new QAction(tr("&Delete album..."), this);
QAction *quitAction = new QAction(tr("&Quit"), this);
QAction *aboutAction = new QAction(tr("&About"), this);
QAction *aboutQtAction = new QAction(tr("About &Qt"), this);
addAction->setShortcut(tr("Ctrl+A"));
deleteAction->setShortcut(tr("Ctrl+D"));
quitAction->setShortcuts(QKeySequence::Quit);
QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
fileMenu->addAction(addAction);
fileMenu->addAction(deleteAction);
fileMenu->addSeparator();
fileMenu->addAction(quitAction);
QMenu *helpMenu = menuBar()->addMenu(tr("&Help"));
helpMenu->addAction(aboutAction);
helpMenu->addAction(aboutQtAction);
connect(addAction, SIGNAL(triggered(bool)), this, SLOT(addAlbum()));
connect(deleteAction, SIGNAL(triggered(bool)), this, SLOT(deleteAlbum()));
connect(quitAction, SIGNAL(triggered(bool)), this, SLOT(close()));
connect(aboutAction, SIGNAL(triggered(bool)), this, SLOT(about()));
connect(aboutQtAction, SIGNAL(triggered(bool)), qApp, SLOT(aboutQt()));
}
void MainWindow::showImageLabel()
{
profileLabel->hide();
titleLabel->hide();
iconLabel->hide();
trackList->hide();
imageLabel->show();
}
QModelIndex MainWindow::indexOfArtist(const QString &artist)
{
QSqlTableModel *artistModel = model->relationModel(2);
for (int i = 0; i < artistModel->rowCount(); i++) {
QSqlRecord record = artistModel->record(i);
if (record.value("artist") == artist)
return artistModel->index(i, 1);
}
return QModelIndex();
}
void MainWindow::updateHeader(QModelIndex, int, int)
{
adjustHeader();
}
void MainWindow::adjustHeader()
{
albumView->hideColumn(0);
albumView->horizontalHeader()->setResizeMode(1, QHeaderView::Stretch);
albumView->resizeColumnToContents(2);
albumView->resizeColumnToContents(3);
}
void MainWindow::about()
{
QMessageBox::about(this, tr("About Music Archive"),
tr("<p>The <b>Music Archive</b> example shows how to present "
"data from different data sources in the same application. "
"The album titles, and the corresponding artists and release dates, "
"are kept in a database, while each album's tracks are stored "
"in an XML file. </p><p>The example also shows how to add as "
"well as remove data from both the database and the "
"associated XML file using the API provided by the QtSql and "
"QtXml modules, respectively.</p>"));
}