playlistmodel.cpp Example File

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 #include "playlistmodel.h"

 #include <QtCore/qfileinfo.h>
 #include <QtCore/qurl.h>

 #include <qmediaplaylist.h>

 PlaylistModel::PlaylistModel(QObject *parent)
     : QAbstractItemModel(parent)
     , m_playlist(0)
 {
 }

 int PlaylistModel::rowCount(const QModelIndex &parent) const
 {
     return m_playlist && !parent.isValid() ? m_playlist->mediaCount() : 0;
 }

 int PlaylistModel::columnCount(const QModelIndex &parent) const
 {
     return !parent.isValid() ? ColumnCount : 0;
 }

 QModelIndex PlaylistModel::index(int row, int column, const QModelIndex &parent) const
 {
     return m_playlist && !parent.isValid()
             && row >= 0 && row < m_playlist->mediaCount()
             && column >= 0 && column < ColumnCount
         ? createIndex(row, column)
         : QModelIndex();
 }

 QModelIndex PlaylistModel::parent(const QModelIndex &child) const
 {
     Q_UNUSED(child);

     return QModelIndex();
 }

 QVariant PlaylistModel::data(const QModelIndex &index, int role) const
 {
     if (index.isValid() && role == Qt::DisplayRole) {
         QVariant value = m_data[index];
         if (!value.isValid() && index.column() == Title) {
             QUrl location = m_playlist->media(index.row()).canonicalUrl();
             return QFileInfo(location.path()).fileName();
         }

         return value;
     }
     return QVariant();
 }

 QMediaPlaylist *PlaylistModel::playlist() const
 {
     return m_playlist;
 }

 void PlaylistModel::setPlaylist(QMediaPlaylist *playlist)
 {
     if (m_playlist) {
         disconnect(m_playlist, SIGNAL(mediaAboutToBeInserted(int,int)), this, SLOT(beginInsertItems(int,int)));
         disconnect(m_playlist, SIGNAL(mediaInserted(int,int)), this, SLOT(endInsertItems()));
         disconnect(m_playlist, SIGNAL(mediaAboutToBeRemoved(int,int)), this, SLOT(beginRemoveItems(int,int)));
         disconnect(m_playlist, SIGNAL(mediaRemoved(int,int)), this, SLOT(endRemoveItems()));
         disconnect(m_playlist, SIGNAL(mediaChanged(int,int)), this, SLOT(changeItems(int,int)));
     }

     m_playlist = playlist;

     if (m_playlist) {
         connect(m_playlist, SIGNAL(mediaAboutToBeInserted(int,int)), this, SLOT(beginInsertItems(int,int)));
         connect(m_playlist, SIGNAL(mediaInserted(int,int)), this, SLOT(endInsertItems()));
         connect(m_playlist, SIGNAL(mediaAboutToBeRemoved(int,int)), this, SLOT(beginRemoveItems(int,int)));
         connect(m_playlist, SIGNAL(mediaRemoved(int,int)), this, SLOT(endRemoveItems()));
         connect(m_playlist, SIGNAL(mediaChanged(int,int)), this, SLOT(changeItems(int,int)));
     }

     reset();
 }

 bool PlaylistModel::setData(const QModelIndex &index, const QVariant &value, int role)
 {
     Q_UNUSED(role);
     m_data[index] = value;
     emit dataChanged(index, index);
     return true;
 }

 void PlaylistModel::beginInsertItems(int start, int end)
 {
     m_data.clear();
     beginInsertRows(QModelIndex(), start, end);
 }

 void PlaylistModel::endInsertItems()
 {
     endInsertRows();
 }

 void PlaylistModel::beginRemoveItems(int start, int end)
 {
     m_data.clear();
     beginRemoveRows(QModelIndex(), start, end);
 }

 void PlaylistModel::endRemoveItems()
 {
     endInsertRows();
 }

 void PlaylistModel::changeItems(int start, int end)
 {
     m_data.clear();
     emit dataChanged(index(start,0), index(end,ColumnCount));
 }