playlistmodel.cpp Example File

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  #include "playlistmodel.h"

  #include <QFileInfo>
  #include <QUrl>
  #include <QMediaPlaylist>

  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)));
      }

      beginResetModel();
      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)));
      }

      endResetModel();
  }

  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));
  }