playlistmodel.h 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."
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/

  #ifndef PLAYLISTMODEL_H
  #define PLAYLISTMODEL_H

  #include <QAbstractItemModel>
  #include <QScopedPointer>

  class QMediaPlaylist;

  class PlaylistModel : public QAbstractItemModel
  {
      Q_OBJECT

  public:
      enum Column
      {
          Title = 0,
          ColumnCount
      };

      explicit PlaylistModel(QObject *parent = nullptr);
      ~PlaylistModel();

      int rowCount(const QModelIndex &parent = QModelIndex()) const override;
      int columnCount(const QModelIndex &parent = QModelIndex()) const override;

      QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const override;
      QModelIndex parent(const QModelIndex &child) const override;

      QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;

      QMediaPlaylist *playlist() const;
      void setPlaylist(QMediaPlaylist *playlist);

      bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::DisplayRole) override;

  private slots:
      void beginInsertItems(int start, int end);
      void endInsertItems();
      void beginRemoveItems(int start, int end);
      void endRemoveItems();
      void changeItems(int start, int end);

  private:
      QScopedPointer<QMediaPlaylist> m_playlist;
      QMap<QModelIndex, QVariant> m_data;
  };

  #endif // PLAYLISTMODEL_H