/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the examples of the Qt Toolkit.

**

**

**

** $QT_END_LICENSE$

**

***************************************************************************/

#include <QtGui>

#include "mainwindow.h"

//![0]

MainWindow::MainWindow()

{

    audioOutput = new Phonon::AudioOutput(Phonon::MusicCategory, this);

    mediaObject = new Phonon::MediaObject(this);

    metaInformationResolver = new Phonon::MediaObject(this);

    mediaObject->setTickInterval(1000);

//![0]

//![2]

    connect(mediaObject, SIGNAL(tick(qint64)), this, SLOT(tick(qint64)));

    connect(mediaObject, SIGNAL(stateChanged(Phonon::State,Phonon::State)),

            this, SLOT(stateChanged(Phonon::State,Phonon::State)));

    connect(metaInformationResolver, SIGNAL(stateChanged(Phonon::State,Phonon::State)),

            this, SLOT(metaStateChanged(Phonon::State,Phonon::State)));

    connect(mediaObject, SIGNAL(currentSourceChanged(Phonon::MediaSource)),

            this, SLOT(sourceChanged(Phonon::MediaSource)));

    connect(mediaObject, SIGNAL(aboutToFinish()), this, SLOT(aboutToFinish()));

//![2]

//![1]

    Phonon::createPath(mediaObject, audioOutput);

//![1]

    setupActions();

    setupMenus();

    setupUi();

    timeLcd->display("00:00"); 

}

//![6]

void MainWindow::addFiles()

{

    QStringList files = QFileDialog::getOpenFileNames(this, tr("Select Music Files"), 

        QDesktopServices::storageLocation(QDesktopServices::MusicLocation));

    if (files.isEmpty())

        return;

    int index = sources.size();

    foreach (QString string, files) {

            Phonon::MediaSource source(string);

        sources.append(source);

    } 

    if (!sources.isEmpty())

        metaInformationResolver->setCurrentSource(sources.at(index));

}

//![6]

void MainWindow::about()

{

    QMessageBox::information(this, tr("About Music Player"),

        tr("The Music Player example shows how to use Phonon - the multimedia"

           " framework that comes with Qt - to create a simple music player."));

}

//![9]

void MainWindow::stateChanged(Phonon::State newState, Phonon::State /* oldState */)

{

    switch (newState) {

        case Phonon::ErrorState:

            if (mediaObject->errorType() == Phonon::FatalError) {

                QMessageBox::warning(this, tr("Fatal Error"),

                mediaObject->errorString());

            } else {

                QMessageBox::warning(this, tr("Error"),

                mediaObject->errorString());

            }

            break;

//![9]

//![10]

        case Phonon::PlayingState:

                playAction->setEnabled(false);

                pauseAction->setEnabled(true);

                stopAction->setEnabled(true);

                break;

        case Phonon::StoppedState:

                stopAction->setEnabled(false);

                playAction->setEnabled(true);

                pauseAction->setEnabled(false);

                timeLcd->display("00:00");

                break;

        case Phonon::PausedState:

                pauseAction->setEnabled(false);

                stopAction->setEnabled(true);

                playAction->setEnabled(true);

                break;

//![10]

        case Phonon::BufferingState:

                break;

        default:

            ;

    }

}

//![11]

void MainWindow::tick(qint64 time)

{

    QTime displayTime(0, (time / 60000) % 60, (time / 1000) % 60);

    timeLcd->display(displayTime.toString("mm:ss"));

}

//![11]

//![12]

void MainWindow::tableClicked(int row, int /* column */)

{

    bool wasPlaying = mediaObject->state() == Phonon::PlayingState;

    mediaObject->stop();

    mediaObject->clearQueue();

    if (row >= sources.size())

        return;

    mediaObject->setCurrentSource(sources[row]);

    if (wasPlaying)

        mediaObject->play();

    else

        mediaObject->stop();

}

//![12]

//![13]

void MainWindow::sourceChanged(const Phonon::MediaSource &source)

{

    musicTable->selectRow(sources.indexOf(source));

    timeLcd->display("00:00");

}

//![13]

//![14]

void MainWindow::metaStateChanged(Phonon::State newState, Phonon::State /* oldState */)

{

    if (newState == Phonon::ErrorState) {

        QMessageBox::warning(this, tr("Error opening files"),

            metaInformationResolver->errorString());

        while (!sources.isEmpty() &&

               !(sources.takeLast() == metaInformationResolver->currentSource())) {}  /* loop */;

        return;

    }

    if (newState != Phonon::StoppedState && newState != Phonon::PausedState)

        return;

    if (metaInformationResolver->currentSource().type() == Phonon::MediaSource::Invalid)

            return;

    QMap<QString, QString> metaData = metaInformationResolver->metaData();

    QString title = metaData.value("TITLE");

    if (title == "")

        title = metaInformationResolver->currentSource().fileName();

    QTableWidgetItem *titleItem = new QTableWidgetItem(title);

    titleItem->setFlags(titleItem->flags() ^ Qt::ItemIsEditable);

    QTableWidgetItem *artistItem = new QTableWidgetItem(metaData.value("ARTIST"));

    artistItem->setFlags(artistItem->flags() ^ Qt::ItemIsEditable);

    QTableWidgetItem *albumItem = new QTableWidgetItem(metaData.value("ALBUM"));

    albumItem->setFlags(albumItem->flags() ^ Qt::ItemIsEditable);

    QTableWidgetItem *yearItem = new QTableWidgetItem(metaData.value("DATE"));

    yearItem->setFlags(yearItem->flags() ^ Qt::ItemIsEditable);

//![14]

    int currentRow = musicTable->rowCount();

    musicTable->insertRow(currentRow);

    musicTable->setItem(currentRow, 0, titleItem);

    musicTable->setItem(currentRow, 1, artistItem);

    musicTable->setItem(currentRow, 2, albumItem);

    musicTable->setItem(currentRow, 3, yearItem);

//![15]

    if (musicTable->selectedItems().isEmpty()) {

        musicTable->selectRow(0);

        mediaObject->setCurrentSource(metaInformationResolver->currentSource());

    }

    Phonon::MediaSource source = metaInformationResolver->currentSource();

    int index = sources.indexOf(metaInformationResolver->currentSource()) + 1;

    if (sources.size() > index) {

        metaInformationResolver->setCurrentSource(sources.at(index));

    }

    else {

        musicTable->resizeColumnsToContents();

        if (musicTable->columnWidth(0) > 300)

            musicTable->setColumnWidth(0, 300);

    }

}

//![15]

//![16]

void MainWindow::aboutToFinish()

{

    int index = sources.indexOf(mediaObject->currentSource()) + 1;

    if (sources.size() > index) {

        mediaObject->enqueue(sources.at(index));

    }

}

//![16]

void MainWindow::setupActions()

{

    playAction = new QAction(style()->standardIcon(QStyle::SP_MediaPlay), tr("Play"), this);

    playAction->setShortcut(tr("Crl+P"));

    playAction->setDisabled(true);

    pauseAction = new QAction(style()->standardIcon(QStyle::SP_MediaPause), tr("Pause"), this);

    pauseAction->setShortcut(tr("Ctrl+A"));

    pauseAction->setDisabled(true);

    stopAction = new QAction(style()->standardIcon(QStyle::SP_MediaStop), tr("Stop"), this);

    stopAction->setShortcut(tr("Ctrl+S"));

    stopAction->setDisabled(true);

    nextAction = new QAction(style()->standardIcon(QStyle::SP_MediaSkipForward), tr("Next"), this);

    nextAction->setShortcut(tr("Ctrl+N"));

    previousAction = new QAction(style()->standardIcon(QStyle::SP_MediaSkipBackward), tr("Previous"), this);

    previousAction->setShortcut(tr("Ctrl+R"));

    addFilesAction = new QAction(tr("Add &Files"), this);

    addFilesAction->setShortcut(tr("Ctrl+F"));

    exitAction = new QAction(tr("E&xit"), this);

    exitAction->setShortcuts(QKeySequence::Quit);

    aboutAction = new QAction(tr("A&bout"), this);

    aboutAction->setShortcut(tr("Ctrl+B"));

    aboutQtAction = new QAction(tr("About &Qt"), this);

    aboutQtAction->setShortcut(tr("Ctrl+Q"));

//![5]

    connect(playAction, SIGNAL(triggered()), mediaObject, SLOT(play()));

    connect(pauseAction, SIGNAL(triggered()), mediaObject, SLOT(pause()) );

    connect(stopAction, SIGNAL(triggered()), mediaObject, SLOT(stop()));

//![5]

    connect(addFilesAction, SIGNAL(triggered()), this, SLOT(addFiles()));

    connect(exitAction, SIGNAL(triggered()), this, SLOT(close()));

    connect(aboutAction, SIGNAL(triggered()), this, SLOT(about()));

    connect(aboutQtAction, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

}

void MainWindow::setupMenus()

{

    QMenu *fileMenu = menuBar()->addMenu(tr("&File"));

    fileMenu->addAction(addFilesAction);

    fileMenu->addSeparator();

    fileMenu->addAction(exitAction);

    QMenu *aboutMenu = menuBar()->addMenu(tr("&Help"));

    aboutMenu->addAction(aboutAction);

    aboutMenu->addAction(aboutQtAction);

}

//![3]

void MainWindow::setupUi()

{

//![3]

    QToolBar *bar = new QToolBar;

    bar->addAction(playAction);

    bar->addAction(pauseAction);

    bar->addAction(stopAction);

//![4]

    seekSlider = new Phonon::SeekSlider(this);

    seekSlider->setMediaObject(mediaObject);

    volumeSlider = new Phonon::VolumeSlider(this);

    volumeSlider->setAudioOutput(audioOutput);

//![4]

    volumeSlider->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Maximum);

    QLabel *volumeLabel = new QLabel;

    volumeLabel->setPixmap(QPixmap("images/volume.png"));

    QPalette palette;

    palette.setBrush(QPalette::Light, Qt::darkGray);

    timeLcd = new QLCDNumber;

    timeLcd->setPalette(palette);

    QStringList headers;

    headers << tr("Title") << tr("Artist") << tr("Album") << tr("Year");

    musicTable = new QTableWidget(0, 4);

    musicTable->setHorizontalHeaderLabels(headers);

    musicTable->setSelectionMode(QAbstractItemView::SingleSelection);

    musicTable->setSelectionBehavior(QAbstractItemView::SelectRows);

    connect(musicTable, SIGNAL(cellPressed(int,int)),

            this, SLOT(tableClicked(int,int)));

    QHBoxLayout *seekerLayout = new QHBoxLayout;

    seekerLayout->addWidget(seekSlider);

    seekerLayout->addWidget(timeLcd);

    QHBoxLayout *playbackLayout = new QHBoxLayout;

    playbackLayout->addWidget(bar);

    playbackLayout->addStretch();

    playbackLayout->addWidget(volumeLabel);

    playbackLayout->addWidget(volumeSlider);

    QVBoxLayout *mainLayout = new QVBoxLayout;

    mainLayout->addWidget(musicTable);

    mainLayout->addLayout(seekerLayout);

    mainLayout->addLayout(playbackLayout);

    QWidget *widget = new QWidget;

    widget->setLayout(mainLayout);

    setCentralWidget(widget);

    setWindowTitle("Phonon Music Player");

}