playlist.h 7.71 KB
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/***************************************************************************
                          playlist.h  -  description
                             -------------------
    begin                : Sat Feb 16 2002
    copyright            : (C) 2002 by Scott Wheeler
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    email                : wheeler@kde.org
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***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 PLAYLIST_H
#define PLAYLIST_H

#include <klistview.h>

#include <qstringlist.h>
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#include <qvaluevector.h>
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#include <qptrstack.h>
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#include "playlistitem.h"
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#include "sortedstringlist.h"
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class KPopupMenu;

class KPopupMenu;
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class KActionMenu;
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class QEvent;
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class Playlist : public KListView
{
    Q_OBJECT
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public:
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    /** 
     * Before creating a playlist directly, please see 
     * PlaylistSplitter::createPlaylist().
     */
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    Playlist(QWidget *parent, const QString &name = QString::null);
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    /** 
     * Before creating a playlist directly, please see 
     * PlaylistSplitter::openPlaylist().
     */
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    Playlist(const QFileInfo &playlistFile, QWidget *parent, const char *name = 0);
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    virtual ~Playlist();

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    /**
     * Saves the file to the currently set file name.  If there is no filename
     * currently set, the default behavior is to prompt the user for a file
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     * name.  
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     */
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    virtual void save();
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    virtual void saveAs();
    virtual void refresh();
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    virtual void clearItem(PlaylistItem *item, bool emitChanged = true);
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    virtual void clearItems(const PlaylistItemList &items);
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    /** 
     * All of the (media) files in the list. 
     */
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    QStringList files() const;
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    /** 
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     * Returns a list of all of the items in the playlist.
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     */
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    PlaylistItemList items() const;
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    /**
     * Returns a list of the currently selected items.
     */
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    PlaylistItemList selectedItems() const;
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    /** 
     * Allow duplicate files in the playlist. 
     */
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    void setAllowDuplicates(bool allow);

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    /** 
     * This is being used as a mini-factory of sorts to make the construction
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     * of PlaylistItems virtual.  In this case it allows for the creation of
     * both PlaylistItems and CollectionListItems.
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     */
    virtual PlaylistItem *createItem(const QFileInfo &file, QListViewItem *after = 0);
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    QString fileName() const { return m_playlistFileName; }
    void setFileName(const QString &n) { m_playlistFileName = n; }
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    void hideColumn(int c);
    void showColumn(int c);
    bool isColumnVisible(int c) const;

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    /**
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     * If m_playlistName has no value -- i.e. the name has not been set to 
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     * something other than the filename, this returns the filename less the
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     * extension.  If m_playlistName does have a value, this returns that.
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     */
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    QString name() const;
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    /**
     * This sets a name for the playlist that is \e different from the file name.
     */ 
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    void setName(const QString &n);
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    int count() const { return childCount(); }
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    /** 
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     * This gets the next item to be played.  This is static because often we 
     * know about the playing item, but not to which list it belongs.
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     */
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    PlaylistItem *nextItem(PlaylistItem *current, bool random = false);
    PlaylistItem *previousItem(PlaylistItem *current, bool random = false);
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    KActionMenu *columnVisibleAction() const { return m_columnVisibleAction; }
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    void setPlaying(PlaylistItem *item, bool playing = true);
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    /**
     * This forces an update of the left most visible column, but does not save
     * the settings for this.
     */ 
    void updateLeftColumn();
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public slots:
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    /**
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     * Remove the currently selected items from the playlist and disk.
     */ 
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    void slotDeleteSelectedItems() { deleteFromDisk(selectedItems()); };
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    virtual void slotSetNext() { emit signalSetNext(selectedItems().getFirst()); }
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    /*
     * The edit slots are required to use the canonical names so that they are
     * detected by the application wide framework.
     */
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    virtual void cut() { copy(); clear(); }
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    virtual void copy();
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    virtual void paste();
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    virtual void clear();
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    virtual void selectAll() { KListView::selectAll(true); }
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    void slotGuessTagInfo();

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protected:
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    /**
     * Remove \a items from the playlist and disk.  This will ignore items that
     * are not actually in the list.
     */
    void deleteFromDisk(const PlaylistItemList &items);

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    virtual bool eventFilter(QObject* watched, QEvent* e);
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    virtual QDragObject *dragObject(QWidget *parent);
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    virtual QDragObject *dragObject() { return dragObject(this); }
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    virtual bool canDecode(QMimeSource *s);
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    virtual void decode(QMimeSource *s);
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    virtual void contentsDropEvent(QDropEvent *e);
    virtual void contentsDragMoveEvent(QDragMoveEvent *e);
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    virtual void showEvent(QShowEvent *e);
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    static QString resolveSymLinks(const QFileInfo &file);
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signals:
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    /** 
     * This signal is connected to PlaylistItem::refreshed() in the 
     * PlaylistItem class. 
     */
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    void signalDataChanged();
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    /** 
     * This is emitted when the playlist selection is changed.  This is used
     * primarily to notify the TagEditor of the new data. 
     */
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    void signalSelectionChanged(const PlaylistItemList &selection);
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    /**
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     * This is connected to the PlaylistBox::Item to let it know when the 
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     * playlist's name has changed.
     */
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    void signalNameChanged(const QString &fileName);
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    void signalNumberOfItemsChanged(Playlist *);
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    void signalDoubleClicked();
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    /**
     * This signal is emitted just before a playlist item is removed from the 
     * list.
     */
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    void signalAboutToRemove(PlaylistItem *item);
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    void signalFilesDropped(const QStringList &files, Playlist *);
    void signalSetNext(PlaylistItem *item);    
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private:
    void setup();
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    void applyTag(QListViewItem *item, const QString &text, int column);
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    int leftMostVisibleColumn() const;
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    /**
     * This class is used internally to store settings that are shared by all
     * of the playlists, such as column order.  It is implemented as a singleton.
     */
    class SharedSettings;

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private slots:
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    void slotEmitSelected() { emit signalSelectionChanged(selectedItems()); }
    void slotEmitDoubleClicked(QListViewItem *) { emit signalDoubleClicked(); }
    void slotShowRMBMenu(QListViewItem *item, const QPoint &point, int column);
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    void slotApplyModification(QListViewItem *item, const QString &text, int column);
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    void slotRenameTag();
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    void slotColumnOrderChanged(int, int from, int to);
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    void slotToggleColumnVisible(int column);
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private:
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    int m_currentColumn;
    SortedStringList m_members;
    int m_processed;
    bool m_allowDuplicates;
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    QPtrStack<PlaylistItem> m_history;
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    QString m_playlistFileName;
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    /**
     * This is only defined if the playlist name is something other than the
     * file name.
     */
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    QString m_playlistName;
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    KPopupMenu *m_rmbMenu;
    KPopupMenu *m_headerMenu;
    KActionMenu *m_columnVisibleAction;
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    int m_rmbPasteID;
    int m_rmbEditID;
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    PlaylistItem *m_playingItem;
    int m_leftColumn;
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};

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QDataStream &operator<<(QDataStream &s, const Playlist &p);
QDataStream &operator>>(QDataStream &s, Playlist &p);

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#endif