playlistmodel.cpp Example File

  /****************************************************************************
  **
  ** Copyright (C) 2017 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, 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)
  {
  }

  PlaylistModel::~PlaylistModel()
  {
  }

  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.data();
  }

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

      beginResetModel();
      m_playlist.reset(playlist);

      if (m_playlist) {
          connect(m_playlist.data(), &QMediaPlaylist::mediaAboutToBeInserted, this, &PlaylistModel::beginInsertItems);
          connect(m_playlist.data(), &QMediaPlaylist::mediaInserted, this, &PlaylistModel::endInsertItems);
          connect(m_playlist.data(), &QMediaPlaylist::mediaAboutToBeRemoved, this, &PlaylistModel::beginRemoveItems);
          connect(m_playlist.data(), &QMediaPlaylist::mediaRemoved, this, &PlaylistModel::endRemoveItems);
          connect(m_playlist.data(), &QMediaPlaylist::mediaChanged, this, &PlaylistModel::changeItems);
      }

      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));
  }