Updates from the weekend. Lots of cleanups. Now also, all items in the

playlists are "children" of the CollectionListItems, and as such always
share their PlaylistItem::Data sections.  I also fixed things so that
an update in one item will automatically trigger updates in the others.

svn path=/trunk/kdemultimedia/juk/; revision=178225

Makefile.am

@@ -3,12 +3,12 @@ bin_PROGRAMS = juk
 
 ## INCLUDES were found outside kdevelop specific part
 
-juk_SOURCES = collectionlist.cpp playlistitem.cpp playlist.cpp playlistsplitter.cpp listboxpixmap.cpp playlistbox.cpp tageditor.cpp cache.cpp audiodata.cpp genrelistreader.cpp genrelistlist.cpp genrelist.cpp genre.cpp player.cpp tag.cpp customaction.cpp playlistwidget.cpp slideraction.cpp taggerwidget.cpp juk.cpp main.cpp 
+juk_SOURCES = collectionlist.cpp playlistitem.cpp playlist.cpp playlistsplitter.cpp listboxpixmap.cpp playlistbox.cpp tageditor.cpp cache.cpp audiodata.cpp genrelistreader.cpp genrelistlist.cpp genrelist.cpp genre.cpp player.cpp tag.cpp customaction.cpp slideraction.cpp juk.cpp main.cpp 
 juk_LDADD   = -lid3 -lsoundserver_idl $(LIB_KFILE) $(LIB_KDEUI) $(LIB_KDECORE) $(LIB_QT) $(LIBSOCKET)
 
 SUBDIRS = pics data 
 
-EXTRA_DIST = main.cpp juk.cpp juk.h juk.desktop jukui.rc taggerwidget.cpp taggerwidget.h slideraction.cpp slideraction.h playlistwidget.cpp playlistwidget.h customaction.h customaction.cpp tag.cpp tag.h player.cpp player.h genre.h genre.cpp hi16-app-juk.png hi32-app-juk.png hi48-app-juk.png genrelist.cpp genrelist.h genrelistlist.cpp genrelistlist.h genrelistreader.cpp genrelistreader.h audiodata.cpp audiodata.h cache.cpp cache.h tageditor.cpp tageditor.h playlistbox.cpp playlistbox.h listboxpixmap.cpp listboxpixmap.h playlistsplitter.cpp playlistsplitter.h playlist.cpp playlist.h playlistitem.cpp playlistitem.h collectionlist.cpp collectionlist.h 
+EXTRA_DIST = main.cpp juk.cpp juk.h juk.desktop jukui.rc slideraction.cpp slideraction.h customaction.h customaction.cpp tag.cpp tag.h player.cpp player.h genre.h genre.cpp hi16-app-juk.png hi32-app-juk.png hi48-app-juk.png genrelist.cpp genrelist.h genrelistlist.cpp genrelistlist.h genrelistreader.cpp genrelistreader.h audiodata.cpp audiodata.h cache.cpp cache.h tageditor.cpp tageditor.h playlistbox.cpp playlistbox.h listboxpixmap.cpp listboxpixmap.h playlistsplitter.cpp playlistsplitter.h playlist.cpp playlist.h playlistitem.cpp playlistitem.h collectionlist.cpp collectionlist.h 
 
 install-data-local:
 	$(mkinstalldirs) $(kde_appsdir)/Multimedia/

collectionlist.cpp

@@ -15,9 +15,69 @@
  *                                                                         *
  ***************************************************************************/
 
+#include <kdebug.h>
+
 #include "collectionlist.h"
 
-CollectionList::CollectionList(QWidget *parent, const char *name) : Playlist(parent, name)
+////////////////////////////////////////////////////////////////////////////////
+// static methods
+////////////////////////////////////////////////////////////////////////////////
+
+CollectionList *CollectionList::list = 0;
+
+CollectionList *CollectionList::instance()
+{
+    return(list);
+}
+
+void CollectionList::initialize(QWidget *parent)
+{
+    list = new CollectionList(parent);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// public methods
+////////////////////////////////////////////////////////////////////////////////
+
+void CollectionList::append(const QString &item)
+{
+    Playlist::append(item);
+    emit(collectionChanged());
+}
+
+void CollectionList::append(const QStringList &items)
+{
+    Playlist::append(items);
+    emit(collectionChanged());
+}
+
+CollectionListItem *CollectionList::lookup(const QString &file)
+{
+    return(itemsDict.find(file));
+}
+
+PlaylistItem *CollectionList::createItem(const QFileInfo &file)
+{
+    PlaylistItem *item = new CollectionListItem(file);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// public slots
+////////////////////////////////////////////////////////////////////////////////
+
+void CollectionListItem::refresh()
+{
+    refreshImpl();
+    
+    // This is connected to refreshImpl() for all of the items children.
+    emit(refreshed());
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// protected methods
+////////////////////////////////////////////////////////////////////////////////
+
+CollectionList::CollectionList(QWidget *parent) : Playlist(parent, "collectionList")
 {
 
 }
@@ -26,3 +86,52 @@ CollectionList::~CollectionList()
 {
 
 }
+
+void CollectionList::appendImpl(const QString &item)
+{
+    if(!lookup(item))
+	Playlist::appendImpl(item);
+}
+
+void CollectionList::addToDict(const QString &file, CollectionListItem *item)
+{
+    itemsDict.replace(file, item);
+}
+
+void CollectionList::removeFromDict(const QString &file)
+{
+    itemsDict.remove(file);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// CollectionListItem public methods
+////////////////////////////////////////////////////////////////////////////////
+
+CollectionListItem::CollectionListItem(const QFileInfo &file) : PlaylistItem(CollectionList::instance())
+{
+    CollectionList *l = CollectionList::instance();
+    if(l) {
+	l->addToDict(file.absFilePath(), this);
+	setData(Data::newUser(file));
+	refresh();
+	connect(this, SIGNAL(refreshed()), l, SIGNAL(dataChanged()));
+    }
+    else
+	kdError() << "CollectionListItems should not be created before"
+		  << "CollectionList::initialize() has been called." << endl;
+}
+
+CollectionListItem::~CollectionListItem()
+{
+    CollectionList *l = CollectionList::instance();
+    if(l)
+	l->removeFromDict(getData()->absFilePath());
+}
+
+void CollectionListItem::addChildItem(PlaylistItem *child)
+{
+    connect(child, SIGNAL(refreshed()), this, SLOT(refresh()));
+    connect(this, SIGNAL(refreshed()), child, SLOT(refreshImpl()));   
+}
+
+#include "collectionlist.moc"

collectionlist.h

@@ -18,14 +18,63 @@
 #ifndef COLLECTIONLIST_H
 #define COLLECTIONLIST_H
 
+#include <qdict.h>
+
 #include "playlist.h"
+#include "playlistitem.h"
+
+/** This is the "collection", or all of the music files that have been opened
+    in any playlist and not explicitly removed from the collection.
+
+    It is being implemented as a "semi-singleton" because I need universal access
+    to just one instance.  However, because the collection needs initialization 
+    parameters (that will not always be available when an instance is needed).  
+    Hence there will be the familiar singleton "instance()" method allong with an
+    "initialize()" method.
+*/
+
+class CollectionListItem;
 
 class CollectionList : public Playlist
 {
+    friend class CollectionListItem;
+
     Q_OBJECT
 public: 
-    CollectionList(QWidget *parent = 0, const char *name = 0);
+    static CollectionList *instance();
+    static void initialize(QWidget *parent);
+
+    virtual void append(const QString &item);
+    virtual void append(const QStringList &items);
+
+    CollectionListItem *lookup(const QString &file);
+    virtual PlaylistItem *createItem(const QFileInfo &file);
+    
+protected:
+    CollectionList(QWidget *parent = 0);
     virtual ~CollectionList();
+
+    virtual void appendImpl(const QString &item);
+
+    void addToDict(const QString &file, CollectionListItem *item);
+    void removeFromDict(const QString &file);
+
+private:
+    static CollectionList *list;
+    QDict<CollectionListItem> itemsDict;
+};
+
+class CollectionListItem : public PlaylistItem
+{
+    Q_OBJECT
+public:
+    CollectionListItem(const QFileInfo &file);
+    virtual ~CollectionListItem();
+
+    void addChildItem(PlaylistItem *child);
+
+public slots:
+    virtual void refresh();
 };
 
 #endif

juk.cpp

@@ -16,14 +16,11 @@
  ***************************************************************************/
 
 #include <klocale.h>
-#include <keditcl.h>
 #include <kfiledialog.h>
 #include <kiconloader.h>
 #include <kcmdlineargs.h>
 #include <kdebug.h>
 
-#include <qsplitter.h>
-
 #include "juk.h"
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -32,6 +29,8 @@
 
 JuK::JuK(QWidget *parent, const char *name) : KMainWindow(parent, name)
 {
+    // Expect segfaults if you change this order.
+
     setupActions();
     setupLayout();
     setupPlayer();
@@ -64,6 +63,9 @@ void JuK::setupActions()
     KStdAction::paste(this, SLOT(paste()), actionCollection());
     KStdAction::selectAll(this, SLOT(selectAll()), actionCollection());
 
+    // view menu
+    showEditorAction = new KToggleAction(i18n("Show Tag Editor"), 0, actionCollection(), "showEditor");
+
     // play menu
     playAction = new KAction(i18n("&Play"), "1rightarrow", 0, this, SLOT(playFile()), actionCollection(), "playFile");
     pauseAction = new KAction(i18n("P&ause"), "player_pause", 0, this, SLOT(pauseFile()), actionCollection(), "pauseFile");
@@ -82,6 +84,7 @@ void JuK::setupLayout()
 
     splitter = new PlaylistSplitter(this, "playlistSplitter");
     setCentralWidget(splitter);
+    connect(showEditorAction, SIGNAL(toggled(bool)), splitter, SLOT(setEditorVisible(bool)));
 
     // set the slider to the proper orientation and make it stay that way
     sliderAction->updateOrientation();
@@ -89,6 +92,8 @@ void JuK::setupLayout()
 
     // playlist item activation connection
     connect(splitter, SIGNAL(playlistDoubleClicked(QListViewItem *)), this, SLOT(playItem(QListViewItem *)));
+
+    splitter->setFocus();
 }
 
 void JuK::setupPlayer()
@@ -132,6 +137,12 @@ void JuK::readConfig()
             sliderAction->getVolumeSlider()->setValue(volume);
         }
     }
+    { // view Settings
+        KConfigGroupSaver saver(config, "View");
+	bool showEditor = config->readBoolEntry("ShowEditor", true);
+	showEditorAction->setChecked(showEditor);
+	splitter->setEditorVisible(showEditor);
+    }
 }
 
 void JuK::saveConfig()
@@ -142,6 +153,10 @@ void JuK::saveConfig()
         if(sliderAction && sliderAction->getVolumeSlider())
             config->writeEntry("Volume", sliderAction->getVolumeSlider()->value());
     }
+    { // view settings
+        KConfigGroupSaver saver(config, "View");
+	config->writeEntry("ShowEditor", showEditorAction->isChecked());
+    }
 }
 
 ////////////////////////////////////////////////////////////////////////////////

juk.h

@@ -28,13 +28,9 @@
 #include <kmainwindow.h>
 
 #include <qtimer.h>
-#include <qwidgetstack.h>
 
-#include "taggerwidget.h"
-#include "playlistwidget.h"
 #include "slideraction.h"
 #include "player.h"
-#include "playlistbox.h"
 #include "playlistsplitter.h"
 
 class JuK : public KMainWindow
@@ -57,6 +53,7 @@ private:
     PlaylistSplitter *splitter;
 
     // actions
+    KToggleAction *showEditorAction;
     SliderAction *sliderAction;
     KAction *playAction;
     KAction *pauseAction;

jukui.rc

@@ -11,7 +11,10 @@
 		<Separator/>
 		<Action name="file_quit"/>
 	</Menu>
-		<Menu name="player"><text>&amp;Player</text>
+	<Menu name="view"><text>&amp;View</text>
+		<Action name="showEditor"/>
+	</Menu>
+	<Menu name="player"><text>&amp;Player</text>
 		<Action name="playFile"/>
 		<Action name="pauseFile"/>
 		<Action name="stopFile"/>
@@ -27,7 +30,6 @@
 	<Action name="edit_cut"/>
 	<Action name="edit_copy"/>
 	<Action name="edit_paste"/>
-	<Separator lineSeparator="true"/>
 </ToolBar>
 
 <ToolBar name="playToolBar" noMerge="1"><text>Play Toolbar</text>

playlist.cpp

@@ -26,6 +26,7 @@
 #include <qptrlist.h>
 
 #include "playlist.h"
+#include "collectionlist.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 // public members
@@ -34,6 +35,7 @@
 Playlist::Playlist(QWidget *parent, const char *name) : KListView(parent, name)
 {
     setup();
+    allowDuplicates = false;
 }
 
 Playlist::~Playlist()
@@ -43,38 +45,27 @@ Playlist::~Playlist()
 
 void Playlist::append(const QString &item)
 {
+    collectionListChanged = false;
+
     QApplication::setOverrideCursor(Qt::waitCursor);
     appendImpl(item);
     QApplication::restoreOverrideCursor();
-    emit(collectionChanged(this));
+    
+    if(collectionListChanged)
+	emit(collectionChanged());
 }
 
 void Playlist::append(const QStringList &items)
 {
+    collectionListChanged = false;
+
     QApplication::setOverrideCursor(Qt::waitCursor);
     for(QStringList::ConstIterator it = items.begin(); it != items.end(); ++it)
         appendImpl(*it);
     QApplication::restoreOverrideCursor();
-    emit(collectionChanged(this));
-}
 
-void Playlist::append(PlaylistItem *item)
-{
-    if(item && members.contains(item->absFilePath()) == 0) {
-        members.append(item->absFilePath());
-        (void) new PlaylistItem(*item, this);
-    }
-    emit(collectionChanged(this));
-}
-
-void Playlist::append(QPtrList<PlaylistItem> &items)
-{
-    QPtrListIterator<PlaylistItem> it(items);
-    while(it.current()) {
-        append(it.current());
-        ++it;
-    }
-    // the emit(collectionChanged()) is handled in the above function
+    if(collectionListChanged)
+	emit(collectionChanged());
 }
 
 void Playlist::clearItems(const QPtrList<PlaylistItem> &items)
@@ -132,6 +123,47 @@ QStringList &Playlist::getAlbumList()
     return(albumList);
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// protected members
+////////////////////////////////////////////////////////////////////////////////
+
+PlaylistItem *Playlist::createItem(const QFileInfo &file)
+{
+    CollectionListItem *item = CollectionList::instance()->lookup(file.absFilePath());
+
+    if(item)
+	return(new PlaylistItem(item, this));
+    else if(CollectionList::instance()) {
+	item = new CollectionListItem(file);
+	collectionListChanged = true;
+	return(new PlaylistItem(item, this));
+    }
+    else
+	return(0);
+}
+
+void Playlist::appendImpl(const QString &item)
+{
+    processEvents();
+    QFileInfo file(QDir::cleanDirPath(item));
+    if(file.exists()) {
+        if(file.isDir()) {
+            QDir dir(file.filePath());
+            QStringList dirContents=dir.entryList();
+            for(QStringList::Iterator it = dirContents.begin(); it != dirContents.end(); ++it)
+                if(*it != "." && *it != "..")
+                    appendImpl(file.filePath() + QDir::separator() + *it);
+        }
+        else {
+            QString extension = file.extension(false);
+            if(extensions.contains(extension) > 0 && (members.contains(file.absFilePath()) == 0 || allowDuplicates)) {
+                members.append(file.absFilePath());
+                (void) createItem(file);
+            }
+        }
+    }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // private members
 ////////////////////////////////////////////////////////////////////////////////
@@ -161,31 +193,6 @@ void Playlist::setup()
     connect(this, SIGNAL(selectionChanged()), this, SLOT(emitSelected()));
 }
 
-void Playlist::appendImpl(const QString &item)
-{
-    processEvents();
-    QFileInfo file(QDir::cleanDirPath(item));
-    if(file.exists()) {
-        if(file.isDir()) {
-            QDir dir(file.filePath());
-            QStringList dirContents=dir.entryList();
-            for(QStringList::Iterator it = dirContents.begin(); it != dirContents.end(); ++it) {
-                if(*it != "." && *it != "..") {
-                    appendImpl(file.filePath() + QDir::separator() + *it);
-                }
-            }
-        }
-        else {
-            QString extension = file.extension(false);
-            if(extensions.contains(extension) > 0 && members.contains(file.absFilePath()) == 0) {
-                members.append(file.absFilePath());
-                (void) new PlaylistItem(file, this);
-            }
-        }
-    }
-}
-
-
 void Playlist::processEvents()
 {
     if(processed == 0)

playlist.h

@@ -33,8 +33,6 @@ public:
 
     virtual void append(const QString &item);
     virtual void append(const QStringList &items);
-    virtual void append(PlaylistItem *item);
-    virtual void append(QPtrList<PlaylistItem> &items);
 
     virtual void clearItems(const QPtrList<PlaylistItem> &items);
 
@@ -43,6 +41,9 @@ public:
     void remove();
     void remove(const QPtrList<PlaylistItem> &items);
 
+    /** Allow duplicate files in the playlist. */
+    void setAllowDuplicates(bool allow);
+
     // These are used in a hard-core, encapsulation breaking way and should be
     // replaced soon (see PlaylistItem).  Unfortunately they're more efficient
     // than elegant solutions.  These also should be removed by doing the
@@ -52,27 +53,39 @@ public:
     QStringList &getArtistList();
     QStringList &getAlbumList();
 
+protected:
+    /** This is being used as a mini-factory of sorts to make the construction
+	of PlaylistItems virtual. */
+    virtual PlaylistItem *createItem(const QFileInfo &file);
+    virtual void appendImpl(const QString &item);
+
 private:
     void setup();
-    void appendImpl(const QString &item);
+    void processEvents();
 
     QStringList extensions;
     QStringList members;
     QStringList artistList;
     QStringList albumList;
-    void processEvents();
     int processed;
+    bool collectionListChanged;
+    bool allowDuplicates;
 
 private slots:
     void emitSelected();
 
 signals:
+    /** This signal is connected to PlaylistItem::refreshed() in the 
+	PlaylistItem class. */
     void dataChanged();
 
-    // This signal should later be moved to the "CollectionList" subclass of
-    // Playlist.
+    /** This signal is emitted when items are added to the collection list.  
+	This happens in the createItem() method when items are added to the 
+	collection. */
+    void collectionChanged();
 
-    void collectionChanged(Playlist *list);
+    /** This is emitted when the playlist selection is changed.  This is used
+	primarily to notify the TagEditor of the new data. */
     void selectionChanged(const QPtrList<PlaylistItem> &selection);
 };
 

playlistitem.cpp

@@ -19,141 +19,72 @@
 
 #include "playlistitem.h"
 #include "playlist.h"
-#include "cache.h"
+#include "collectionlist.h"
 
-class PlaylistItem::Data : public QFileInfo
-{
-public:
-    static Data *newUser(const QFileInfo &file);
-    Data *newUser();
-    void deleteUser();
-
-    Tag *getTag();
-    AudioData *getAudioData();
-
-    void setFile(const QString &file);
-
-protected:
-    // Because we're trying to use this as a shared item, we want all access
-    // to be through pointers (so that it's safe to use delete this).  Thus
-    // creation of the object should be done by the newUser methods above
-    // and deletion should be handled by deleteUser.  Making the constructor
-    // and destructor private ensures this.
-
-    Data(const QFileInfo &file);
-    virtual ~Data();
-
-private:
-    int referenceCount;
-
-    CacheItem *cache;
-    Tag *tag;
-    AudioData *audioData;
-};
 
 ////////////////////////////////////////////////////////////////////////////////
-// PlaylistItem::Data public methods
+// PlaylistItem public methods
 ////////////////////////////////////////////////////////////////////////////////
 
-PlaylistItem::Data *PlaylistItem::Data::newUser(const QFileInfo &file)
+PlaylistItem::PlaylistItem(CollectionListItem *item, Playlist *parent) : QObject(parent), KListViewItem(parent)
 {
-    return(new Data(file));
+    if(item) {
+	data = item->getData()->newUser();
+	item->addChildItem(this);
+	refreshImpl();
+	connect(this, SIGNAL(refreshed()), parent, SIGNAL(dataChanged()));
+    }
+
+    setDragEnabled(true);
 }
 
-PlaylistItem::Data *PlaylistItem::Data::newUser()
+PlaylistItem::~PlaylistItem()
 {
-    referenceCount++;
-    return(this);
+    data->deleteUser();
 }
 
-void PlaylistItem::Data::deleteUser()
+void PlaylistItem::setFile(const QString &file)
 {
-    // The delete(this) is safe because we control object creation through a
-    // protected constructor and the newUser() methods.
-
-    if(--referenceCount == 0)
-        delete(this);
+    data->setFile(file);
+    refresh();
 }
 
-Tag *PlaylistItem::Data::getTag()
+Tag *PlaylistItem::getTag()
 {
-    if(!tag)
-        tag = new Tag(filePath());
-    return(tag);
+    return(data->getTag());
 }
 
-AudioData *PlaylistItem::Data::getAudioData()
+AudioData *PlaylistItem::getAudioData()
 {
-    if(!audioData)
-        audioData = new AudioData(filePath());
-    return(audioData);
+    return(data->getAudioData());
 }
 
-void PlaylistItem::Data::setFile(const QString &file)
-{
-    delete(tag);
-    tag = 0;
+// QFileInfo-ish methods
 
-    QFileInfo::setFile(file);
-}
+QString PlaylistItem::fileName() const { return(data->fileName()); }
+QString PlaylistItem::filePath() const { return(data->filePath()); }
+QString PlaylistItem::absFilePath() const { return(data->absFilePath()); }
+QString PlaylistItem::dirPath(bool absPath) const { return(data->dirPath(absPath)); }
+bool PlaylistItem::isWritable() const { return(data->isWritable()); }
 
 ////////////////////////////////////////////////////////////////////////////////
-// PlaylistItem::Data protected methods
+// PlaylistItem public slots
 ////////////////////////////////////////////////////////////////////////////////
 
-PlaylistItem::Data::Data(const QFileInfo &file) : QFileInfo(file)
-{
-    referenceCount = 1;
-
-    // initialize pointers to null
-    cache = 0;
-    tag = 0;
-    audioData = 0;
-}
-
-PlaylistItem::Data::~Data()
+void PlaylistItem::refresh()
 {
-    // Create our cache "on the way out" to avoid having lots of duplicate copies
-    // of the same information in memory.  This checks to see if the item is in
-    // the cache and 
-
-    if(tag && !cache && !Cache::instance()->isEmpty() && !Cache::instance()->find(absFilePath()) )
-	Cache::instance()->replace(absFilePath(), new CacheItem(*tag));
-
-    delete(tag);
-    delete(audioData);
+    // This signal will be received by the "parent" CollectionListItem which will
+    // in turn call refreshImpl() for all of its children, including this item.
+    emit(refreshed());
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-// PlaylistItem public methods
+// PlaylistItem protected methods
 ////////////////////////////////////////////////////////////////////////////////
 
-PlaylistItem::PlaylistItem(const QFileInfo &file, Playlist *parent) : QObject(parent), KListViewItem(parent)
-{
-    data = Data::newUser(file);
-    refresh();
-    connect(this, SIGNAL(refreshed()), parent, SIGNAL(dataChanged()));
-}
-
-PlaylistItem::PlaylistItem(PlaylistItem &item, Playlist *parent) : QObject(parent), KListViewItem(parent)
-{
-    data = item.getData()->newUser();
-    //  connect(&item, SIGNAL(destroyed(PlaylistItem *)), this, SLOT(parentDestroyed(PlaylistItem *)));
-    addSibling(&item);
-
-    refresh();
-    connect(this, SIGNAL(refreshed()), parent, SIGNAL(dataChanged()));
-}
-
-PlaylistItem::~PlaylistItem()
-{
-    data->deleteUser();
-}
-
-void PlaylistItem::setFile(const QString &file)
+PlaylistItem::PlaylistItem(Playlist *parent) : QObject(parent), KListViewItem(parent)
 {
-    data->setFile(file);
-    refresh();
+    setDragEnabled(true);
 }
 
 PlaylistItem::Data *PlaylistItem::getData()
@@ -161,31 +92,18 @@ PlaylistItem::Data *PlaylistItem::getData()