dynamicplaylist.h 2.88 KB
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/***************************************************************************
    begin                : Mon May 5 2003
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    copyright            : (C) 2003 - 2004 by Scott Wheeler
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    email                : wheeler@kde.org
***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef DYNAMICPLAYLIST_H
#define DYNAMICPLAYLIST_H

#include "playlist.h"

/**
 * A Playlist that is a union of other playlists that is created dynamically.
 */

class DynamicPlaylist : public Playlist
{
    Q_OBJECT
public:
    /**
     * Creates a dynamic playlist based on lists.
     */
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    DynamicPlaylist(const PlaylistList &lists,
                    PlaylistCollection *collection,
                    const QString &name = QString::null,
                    const QString &iconName = "midi");
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    virtual ~DynamicPlaylist();

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public slots:
    /**
     * Reimplemented so that it will reload all of the playlists that are
     * associated with the dynamic list.
     */
    virtual void slotReload();
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    void slotSetDirty() { m_dirty = true; }
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protected:
    /**
     * Returns true if this list's items need to be updated the next time it's
     * shown.
     */
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    bool dirty() const { return m_dirty; }
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    /**
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     * Return a list of the items in this playlist.  For example in a search
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     * list this should return only the matched items.  By default it returns
     * all of the items in the playlists associated with this dynamic list.
     */
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    virtual PlaylistItemList items();
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    /**
     * Reimplemented from QWidget.  Here it updates the list of items (when
     * appropriate) as the widget is shown.
     */
    virtual void showEvent(QShowEvent *e);

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    /**
     * Updates the items (unconditionally).  This should be reimplemented in
     * subclasses to refresh the items in the dynamic list (i.e. running a
     * search).
     */
    virtual void updateItems();

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private:
    /**
     * Checks to see if the current list of items is "dirty" and if so updates
     * this dynamic playlist's items to be in sync with the lists that it is a
     * wrapper around.
     */
    void checkUpdateItems();

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private slots:
    void slotUpdateItems();

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private:
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    QValueList<PlaylistObserver *> m_observers;
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    PlaylistItemList m_siblings;
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    PlaylistList m_playlists;
    bool m_dirty;
};

#endif