From bbbd1a48bbc54d3f4a172ce07f6e315403b13a64 Mon Sep 17 00:00:00 2001
From: Leo Franchi <lfranchi@kde.org>
Date: Mon, 2 May 2011 18:22:40 -0400
Subject: [PATCH] add new welcomeplaylistmodel

---
 .../widgets/welcomeplaylistmodel.cpp          | 157 ++++++++++++++++++
 .../widgets/welcomeplaylistmodel.h            |  56 +++++++
 2 files changed, 213 insertions(+)
 create mode 100644 src/libtomahawk/widgets/welcomeplaylistmodel.cpp
 create mode 100644 src/libtomahawk/widgets/welcomeplaylistmodel.h

diff --git a/src/libtomahawk/widgets/welcomeplaylistmodel.cpp b/src/libtomahawk/widgets/welcomeplaylistmodel.cpp
new file mode 100644
index 000000000..6068831e8
--- /dev/null
+++ b/src/libtomahawk/widgets/welcomeplaylistmodel.cpp
@@ -0,0 +1,157 @@
+/*
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) 2011  Leo Franchi <leo.franchi@kdab.com>
+
+    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.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+
+#include "welcomeplaylistmodel.h"
+#include <tomahawksettings.h>
+#include <audio/audioengine.h>
+#include <sourcelist.h>
+
+using namespace Tomahawk;
+
+WelcomePlaylistModel::WelcomePlaylistModel( QObject* parent )
+    : QAbstractListModel( parent )
+{
+    loadFromSettings();
+
+    connect( SourceList::instance(), SIGNAL( sourceAdded( Tomahawk::source_ptr ) ), SLOT( loadFromSettings() ), Qt::QueuedConnection );
+    connect( TomahawkSettings::instance(), SIGNAL( recentlyPlayedPlaylistAdded( Tomahawk::playlist_ptr ) ), this, SLOT( plAdded( Tomahawk::playlist_ptr ) ) );
+    connect( AudioEngine::instance(),SIGNAL( playlistChanged( PlaylistInterface* ) ), this, SLOT( playlistChanged( PlaylistInterface* ) ), Qt::QueuedConnection );
+
+    emit emptinessChanged( m_recplaylists.isEmpty() );
+}
+
+void
+WelcomePlaylistModel::loadFromSettings()
+{
+    beginResetModel();
+    m_recplaylists.clear();
+
+    QStringList playlist_guids = TomahawkSettings::instance()->recentlyPlayedPlaylistGuids();
+
+    for( int i = playlist_guids.size() - 1; i >= 0; i-- )
+    {
+        qDebug() << "loading playlist" << playlist_guids[i];
+        Tomahawk::playlist_ptr pl = Tomahawk::Playlist::load( playlist_guids[i] );
+        if ( !pl.isNull() )
+            m_recplaylists << pl;
+    }
+    endResetModel();
+}
+
+
+QVariant
+WelcomePlaylistModel::data( const QModelIndex& index, int role ) const
+{
+    if( !index.isValid() || !hasIndex( index.row(), index.column(), index.parent() ) )
+        return QVariant();
+
+
+    playlist_ptr pl = m_recplaylists[index.row()];
+    switch( role )
+    {
+    case Qt::DisplayRole:
+        return pl->title();
+    case PlaylistRole:
+        return QVariant::fromValue< Tomahawk::playlist_ptr >( pl );
+    case ArtistRole:
+    {
+        if( m_artists.value( pl ).isEmpty() )
+        {
+            QStringList artists;
+
+            foreach( const Tomahawk::plentry_ptr& entry, pl->entries() )
+            {
+                if ( !artists.contains( entry->query()->artist() ) )
+                    artists << entry->query()->artist();
+            }
+
+            m_artists[pl] = artists.join( ", " );
+        }
+
+        return m_artists[pl];
+    }
+    case TrackCountRole:
+        return pl->entries().count();
+    default:
+        return QVariant();
+    }
+}
+
+void
+WelcomePlaylistModel::onSourceAdded( const Tomahawk::source_ptr& source )
+{
+    connect( source->collection().data(), SIGNAL( playlistsDeleted( QList<Tomahawk::playlist_ptr> ) ), SLOT( onPlaylistsRemoved( QList<Tomahawk::playlist_ptr> ) ) );
+}
+
+void
+WelcomePlaylistModel::onPlaylistsRemoved( QList< playlist_ptr > playlists )
+{
+    foreach( const playlist_ptr& pl, playlists ) {
+        if( m_recplaylists.contains( pl ) ) {
+            m_artists.remove( pl );
+            int idx = m_recplaylists.indexOf( pl );
+            beginRemoveRows( QModelIndex(), idx, idx );
+            m_recplaylists.removeAt( idx );
+            endRemoveRows();
+        }
+    }
+
+    emit emptinessChanged( m_recplaylists.isEmpty() );
+}
+
+
+int
+WelcomePlaylistModel::rowCount( const QModelIndex& ) const
+{
+    return m_recplaylists.count();
+}
+
+void
+WelcomePlaylistModel::plAdded( const playlist_ptr& pl )
+{
+    onPlaylistsRemoved( QList< playlist_ptr >() << pl );
+
+    beginInsertRows( QModelIndex(), 0, 0 );
+    m_recplaylists.prepend( pl );;
+    endInsertRows();
+
+    emit emptinessChanged( m_recplaylists.isEmpty() );
+}
+
+void
+WelcomePlaylistModel::playlistChanged( PlaylistInterface* pli )
+{
+    // ARG
+    if( Playlist* pl = dynamic_cast< Playlist* >( pli ) ) {
+        // look for it, qsharedpointer fail
+        playlist_ptr ptr;
+        foreach( const playlist_ptr& test, m_recplaylists ) {
+            if( test.data() == pl )
+                ptr = test;
+        }
+
+        if( !ptr.isNull() && m_artists.contains( ptr ) ) {
+            m_artists[ ptr ] = QString();
+        }
+
+        QModelIndex idx = index( m_recplaylists.indexOf( ptr ), 0, QModelIndex() );
+        emit dataChanged( idx, idx );
+    }
+}
diff --git a/src/libtomahawk/widgets/welcomeplaylistmodel.h b/src/libtomahawk/widgets/welcomeplaylistmodel.h
new file mode 100644
index 000000000..74ae0887c
--- /dev/null
+++ b/src/libtomahawk/widgets/welcomeplaylistmodel.h
@@ -0,0 +1,56 @@
+/*
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) 2011  Leo Franchi <leo.franchi@kdab.com>
+
+    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.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+
+#ifndef WELCOMEPLAYLISTMODEL_H
+#define WELCOMEPLAYLISTMODEL_H
+
+#include <QModelIndex>
+
+#include "playlist.h"
+
+
+class WelcomePlaylistModel : public QAbstractListModel
+{
+    Q_OBJECT
+public:
+    enum ItemRoles
+    { ArtistRole = Qt::UserRole, TrackCountRole, PlaylistRole };
+
+    explicit WelcomePlaylistModel( QObject* parent = 0 );
+    virtual QVariant data( const QModelIndex& index, int role = Qt::DisplayRole ) const;
+    virtual int rowCount( const QModelIndex& parent = QModelIndex() ) const;
+
+signals:
+    void emptinessChanged( bool isEmpty );
+
+private slots:
+    void playlistChanged( PlaylistInterface* );
+    void onSourceAdded( const Tomahawk::source_ptr& source );
+    void onPlaylistsRemoved( QList<Tomahawk::playlist_ptr> );
+    void loadFromSettings();
+
+    void plAdded( const Tomahawk::playlist_ptr& );
+
+private:
+    QList< Tomahawk::playlist_ptr > m_recplaylists;
+    mutable QHash< Tomahawk::playlist_ptr, QString > m_artists;
+};
+
+#endif // WELCOMEPLAYLISTMODEL_H