Qt 5.7 | Qt Multimedia | Media Player Example | playlistmodel.cpp Example File

Qt 5.7.1 Reference Documentation

# playlistmodel.cpp Example File

multimediawidgets/player/playlistmodel.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** 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 The Qt Company Ltd 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 "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));
      }