Next and Prev buttons for Corax and Lorgar, debugging

corax/corax.cpp

@@ -43,7 +43,7 @@ Corax::Corax(QObject *parent):
     
     attributes->addAttribute(W::String(u"connectionsCount"), new M::String(W::String(u"0"), W::Address({u"attributes", u"connectionCount"})));
     attributes->addAttribute(W::String(u"name"), new M::String(W::String(u"Corax"), W::Address({u"attributes", u"name"})));
-    attributes->addAttribute(W::String(u"version"), new M::String(W::String(u"0.0.2"), W::Address({u"attributes", u"version"})));
+    attributes->addAttribute(W::String(u"version"), new M::String(W::String(u"0.0.3"), W::Address({u"attributes", u"version"})));
     attributes->addAttribute(W::String(u"players"), new M::String(W::String(u"0"), W::Address({u"attributes", u"players"})));
     
     createCaches();

corax/models/player.cpp

@@ -4,27 +4,43 @@ M::Player::Player(const W::Address& address, QObject* parent):
     M::Model(address, parent),
     controls(),
     views(),
-    playPauseBtn(new M::Button(address + W::Address{u"Play"})),
+    playPauseBtn(new M::Button(address + W::Address{u"play"})),
+    nextBtn(new M::Button(address + W::Address{u"next"})),
+    prevBtn(new M::Button(address + W::Address{u"prev"})),
     _queueView(new M::List(address + W::Address{u"queueView"})),
     _queue(),
     current(0),
     counter(0),
+    currentIndex(0),
     mode(playBack),
-    playing(false)
+    playing(false),
+    scheduledToplay(false)
 {
     W::Handler* get = W::Handler::create(address + W::Address({u"get"}), this, &M::Player::_h_get);
     W::Handler* hqueue = W::Handler::create(address + W::Address({u"queue"}), this, &M::Player::_h_queue);
     addHandler(get);
     addHandler(hqueue);
     
-    playPauseBtn->setLabel(W::String(u"play"));
+    playPauseBtn->setLabel(W::String(u"Play"));
     playPauseBtn->setEnabled(false);
     connect(playPauseBtn, SIGNAL(activated()), this, SLOT(onPlayPauseBtn()));
     
+    nextBtn->setLabel(W::String(u"Next"));
+    nextBtn->setEnabled(false);
+    connect(nextBtn, SIGNAL(activated()), this, SLOT(onNextBtn()));
+    
+    prevBtn->setLabel(W::String(u"Prev"));
+    prevBtn->setEnabled(false);
+    connect(prevBtn, SIGNAL(activated()), this, SLOT(onPrevBtn()));
+    
     addModel(playPauseBtn);
+    addModel(nextBtn);
+    addModel(prevBtn);
     addModel(_queueView);
     
     controls.insert(std::make_pair(playPause, playPauseBtn->getAddress()));
+    controls.insert(std::make_pair(next, nextBtn->getAddress()));
+    controls.insert(std::make_pair(prev, prevBtn->getAddress()));
     views.insert(std::make_pair(queue, _queueView->getAddress()));
 }
 
@@ -93,23 +109,9 @@ void M::Player::h_get(const W::Event& ev)
 void M::Player::onPlayPauseBtn()
 {
     if (playing) {
-        playPauseBtn->setLabel(W::String(u"Play"));
+        pause();
-        playing = false;
-        
-        switch (mode) {
-            case playBack:
-                broadcast(new W::Vocabulary(), W::Address{u"pause"});
-                break;
-        }
     } else {
-        playPauseBtn->setLabel(W::String(u"Pause"));
+        play();
-        playing = true;
-        
-        switch (mode) {
-            case playBack:
-                broadcast(new W::Vocabulary(), W::Address{u"play"});
-                break;
-        }
     }
 }
 
@@ -120,24 +122,174 @@ void M::Player::h_queue(const W::Event& ev)
     const W::Uint64& id = static_cast<const W::Uint64&>(data.at(u"id"));
     ProxySong* song = new ProxySong(id, address + W::Address{W::String(W::Uint64(counter++).toString())});
     addModel(song);
+    _queue.push_back(song);
+    _queueView->push(song->getAddress());
+    
     if (current == 0) {
+        scheduledToplay = true;
+        setActive(song);
+    }
+    
+    if (currentIndex + 1 < _queue.size()) {
+        nextBtn->setEnabled(true);
+    }
+}
+
+void M::Player::play()
+{
+    if (!playing) {
+        playPauseBtn->setLabel(W::String(u"Pause"));
+        playing = true;
+        
+        switch (mode) {
+            case playBack:
+                if (current == 0) {
+                    scheduledToplay = true;
+                } else {
+                    if (current->isReady()) {
+                        scheduledToplay = false;
+                        broadcast(new W::Vocabulary(), W::Address{u"play"});
+                        break;
+                    } else {
+                        scheduledToplay = true;
+                    }
+                }
+        }
+    }
+}
+
+void M::Player::pause()
+{
+    if (playing) {
+        playPauseBtn->setLabel(W::String(u"Play"));
+        playing = false;
+        
+        switch (mode) {
+            case playBack:
+                scheduledToplay = false;
+                broadcast(new W::Vocabulary(), W::Address{u"pause"});
+                break;
+        }
+    }
+}
+
+void M::Player::onSongReady()
+{
+    emit serviceMessage("Song is ready");
+    playPauseBtn->setEnabled(true);
+    if (scheduledToplay) {
+        scheduledToplay = false;
+        if (playing) {
+            scheduledToplay = false;
+            broadcast(new W::Vocabulary(), W::Address{u"play"});
+        } else {
+            play();
+        }
+    }
+}
+
+void M::Player::onSongNotReady()
+{
+    playPauseBtn->setEnabled(false);
+    emit serviceMessage("Something happend to the current song, not sure yet what to do");
+}
+
+void M::Player::onNextBtn()
+{
+    if (currentIndex + 1 < _queue.size()) {
+        if (playing) {
+            pause();
+            scheduledToplay = true;
+        }
+        setActive(currentIndex + 1);
+    }
+}
+
+void M::Player::onPrevBtn()
+{
+    if (currentIndex > 0) {
+        if (playing) {
+            pause();
+            scheduledToplay = true;
+        }
+        setActive(currentIndex - 1);
+    }
+}
+
+void M::Player::setActive(ProxySong* song)
+{
+    if (current == song) {
+        return;
+    }
+    
+    bool found = false;
+    int index;
+    for (index = 0; index < _queue.size(); ++index) {
+        if (_queue.at(index) == song) {
+            found = true;
+            break;
+        }
+    }
+    
+    if (found) {
+        setActive(index);
+    } else {
+        emit serviceMessage("An attempt to set active a song which is no in the queue, not supposed to happen");
+        return;
+    }
+}
+
+void M::Player::setActive(uint64_t index)
+{
+    if (index >= _queue.size()) {
+        emit serviceMessage("An attempt to set active a song which is no in the queue, not supposed to happen");
+        return;
+    }
+    
+    ProxySong* song = _queue.at(index);
+    currentIndex = index;
+    if (currentIndex + 1 < _queue.size()) {
+        nextBtn->setEnabled(true);
+    } else {
+        nextBtn->setEnabled(false);
+    }
+    
+    if (currentIndex > 0) {
+        prevBtn->setEnabled(true);
+    } else {
+        prevBtn->setEnabled(false);
+    }
+    
+    W::Vocabulary* res = new W::Vocabulary();
+    W::Vector* add = new W::Vector();
+    W::Vector* remove = new W::Vector();
+    if (current != 0) {
+        disconnect(current, SIGNAL(ready()), this, SLOT(onSongReady()));
+        disconnect(current, SIGNAL(notReady()), this, SLOT(onSongNotReady()));
+        remove->push(new W::Uint64(currentPlayback));
+    }
     current = song;
+    connect(song, SIGNAL(ready()), this, SLOT(onSongReady()));
+    connect(song, SIGNAL(notReady()), this, SLOT(onSongNotReady()));
     views.insert(std::make_pair(currentPlayback, song->getAddress()));
     W::Vocabulary* avc = new W::Vocabulary();
     avc->insert(u"type", new W::Uint64(currentPlayback));
     avc->insert(u"address", song->getAddress());
     
-        W::Vector* add = new W::Vector();
     add->push(avc);
     
-        W::Vocabulary* res = new W::Vocabulary();
     res->insert(u"add", add);
-        res->insert(u"remove", new W::Vector());
+    res->insert(u"remove", remove);
+    
     
     broadcast(res, W::Address{u"viewsChange"});
+    if (song->isReady()) {
         playPauseBtn->setEnabled(true);
+        if (scheduledToplay) {
+            play();
+        }
     } else {
-        _queue.push_back(song);
+        playPauseBtn->setEnabled(false);
-        _queueView->push(song->getAddress());
     }
 }
+

corax/models/player.h

@@ -32,13 +32,18 @@ namespace M {
             playPause,
             currentPlayback,
             queue,
-            picture
+            picture,
+            prev,
+            next
         };
         
         enum Mode {
             playBack
         };
         
+        void play();
+        void pause();
+        
     protected:
         void h_subscribe(const W::Event & ev) override;
         
@@ -52,15 +57,26 @@ namespace M {
         ItemMap controls;
         ItemMap views;
         M::Button* playPauseBtn;
+        M::Button* nextBtn;
+        M::Button* prevBtn;
         M::List* _queueView;
         Queue _queue;
         ProxySong* current;
         uint64_t counter;
+        uint64_t currentIndex;
         Mode mode;
         bool playing;
+        bool scheduledToplay;
+        
+        void setActive(ProxySong* song);
+        void setActive(uint64_t index);
         
     private slots:
         void onPlayPauseBtn();
+        void onNextBtn();
+        void onPrevBtn();
+        void onSongReady();
+        void onSongNotReady();
         
     };
 }

lib/wDatabase/database.cpp

@@ -175,6 +175,8 @@ void Database::clear()
     lmdb::txn transaction = lmdb::txn::begin(environment);
     dbi.drop(transaction);
     transaction.commit();
+    
+    elements.clear();
 }
 
 void Database::addModel(M::Model* model)

lib/wModel/icatalogue.cpp

@@ -44,6 +44,15 @@ void M::ICatalogue::clear()
         broadcast(new W::Vocabulary(), W::Address{u"clear"});
     }
     
+    
+    std::map<uint64_t, M::Vocabulary*>::iterator aItr = activeChildren.begin();
+    std::map<uint64_t, M::Vocabulary*>::iterator aEnd = activeChildren.end();
+    for (; aItr != aEnd; ++aItr) {
+        removeModel(aItr->second);
+        aItr->second->deleteLater();
+    }
+    activeChildren.clear();
+    
     emit countChange(0);
 }
 

libjs/wController/controller.js

@@ -188,7 +188,7 @@ var Controller = Subscribable.inherit({
             }
             
             if (this._registered) {
-                global.registerForeignController(pair.n, pair.c);
+                global.unregisterForeignController(pair.n, pair.c);
             }
             
             pair.c.off("serviceMessage", this._onControllerServiceMessage, this);

libjs/wController/file/audio.js

@@ -34,7 +34,6 @@ var Audio = File.inherit({
             this._waitingForFrames = false;
         }
         
-        this.initialized = true;
         return ac;
     },
     _h_responseFrames: function(ev) {

libjs/wController/file/file.js

@@ -63,6 +63,11 @@ var File = Controller.inherit({
         if (ac) {
             this.trigger("additionalChange");
         }
+        
+        if (!this.initialized) {
+            this.initialized = true;
+            this.trigger("ready");
+        }
     },
     "needData": function() {
         if (this._need === 0) {

libjs/wController/localModel.js

@@ -30,7 +30,7 @@ var LocalModel = Subscribable.inherit({
         for (i = 0; i < this._foreignControllers.length; ++i) {
             var pair = this._foreignControllers[i];
             global.unsubscribeForeignController(pair.n, pair.c);
-            global.registerForeignController(pair.n, pair.c);
+            global.unregisterForeignController(pair.n, pair.c);
             
             pair.c.destructor();
         }

libjs/wController/player.js

@@ -27,11 +27,8 @@ var Player = Controller.inherit({
         this.views = Object.create(null);
         this.mode = PlayerMode.straight.playback;
         this._audio = null;
-        this._source = new Source();
-        this._asset = new AV.Asset(this._source);
-        this._player = new AV.Player(this._asset);
-        this._player.play();
         this._createStateMachine();
+        this._createPlayingInfrastructure();
         
         this.addHandler("get");
         this.addHandler("viewsChange");
@@ -54,6 +51,8 @@ var Player = Controller.inherit({
         if (ItemType.reversed[t] !== undefined) {
             switch (t) {
                 case ItemType.straight.playPause:
+                case ItemType.straight.prev:
+                case ItemType.straight.next:
                     var btn = new Button(address.clone());
                     btn.itemType = t;
                     this.controls[t] = btn;
@@ -61,10 +60,10 @@ var Player = Controller.inherit({
                     this.trigger("newElement", btn, t);
                     break;
                 default:
-                    this.trigger("serviceMessage", "An attempt to add ItemType " + ItemType.reversed[t] + " to controls of the Player, but it's not qualified to be a control");
+                    this.trigger("serviceMessage", "An attempt to add ItemType " + ItemType.reversed[t] + " to controls of the Player, but it's not qualified to be a control", 1);
             }
         } else {
-            this.trigger("serviceMessage", "An unrecgnized item ItemType in Player: " + t);
+            this.trigger("serviceMessage", "An unrecgnized item ItemType in Player: " + t, 1);
         }
     },
     _addView: function(type, address) {
@@ -79,7 +78,7 @@ var Player = Controller.inherit({
         if (ItemType.reversed[t] !== undefined) {
             switch (t) {
                 case ItemType.straight.queue:
-                    this.trigger("serviceMessage", "Queue is not supported yet in Player");
+                    this.trigger("serviceMessage", "Queue is not supported yet in Player", 1);
                     break;
                 case ItemType.straight.currentPlayback:
                     ctrl = new Vocabulary(address.clone());
@@ -96,10 +95,10 @@ var Player = Controller.inherit({
                     supported = false;                  //just to avoid adding with addController, since ImageById is not a controller
                     break;
                 default:
-                    this.trigger("serviceMessage", "An attempt to add ItemType " + ItemType.reversed[t] + " to views of the Player, but it's not qualified to be a view");
+                    this.trigger("serviceMessage", "An attempt to add ItemType " + ItemType.reversed[t] + " to views of the Player, but it's not qualified to be a view", 1);
             }
         } else {
-            this.trigger("serviceMessage", "An unrecgnized item ItemType in Player: " + t);
+            this.trigger("serviceMessage", "An unrecognized item ItemType in Player: " + t, 1);
         }
         
         if (supported) {
@@ -110,6 +109,16 @@ var Player = Controller.inherit({
             this.trigger("newElement", ctrl, t);
         }
     },
+    _createPlayingInfrastructure() {
+        if (this._source) {
+            this._source.reset();
+            this._asset.stop();
+            this._player.stop();
+        }
+        this._source = new Source();
+        this._asset = new AV.Asset(this._source);
+        this._player = new AV.Player(this._asset);
+    },
     _createStateMachine: function() {
         this._fsm = new StateMachine("initial", graphs[this.mode]);
         this._fsm.on("stateChanged", this._onStateChanged, this);
@@ -159,7 +168,7 @@ var Player = Controller.inherit({
         
         size = remove.length();
         for (i = 0; i < size; ++i) {
-            this._removeView(remove.at(i));
+            this._removeView(remove.at(i).valueOf());
         }
         
         size = add.length();
@@ -179,6 +188,9 @@ var Player = Controller.inherit({
             this._fsm.manipulation("noMoreFrames");
         }
     },
+    _onControllerReady: function() {
+        this._fsm.manipulation("controllerReady");
+    },
     _onNewPlayBackElement: function(key, element) {
         switch (key) {
             case "image":
@@ -191,6 +203,7 @@ var Player = Controller.inherit({
                     this._audio = new Audio(new Address(["music", element.toString()]));
                     this.addForeignController("Corax", this._audio);
                     this._audio.on("newFrames", this._onAudioNewFrames, this);
+                    this._audio.on("ready", this._onControllerReady, this);
                     this._fsm.manipulation("controller");
                 }
                 break;
@@ -199,7 +212,7 @@ var Player = Controller.inherit({
     _onNewRemoveBackElement: function(key) {
         switch (key) {
             case "image":
-                this._removeView(new Uint64(ItemType.straight.picture));
+                this._removeView(ItemType.straight.picture);
                 break;
             case "audio":
                 this.removeForeignController(this._audio);
@@ -210,14 +223,35 @@ var Player = Controller.inherit({
     _onStateChanged: function(e) {
         switch (e.newState) {
             case "initial":
+                if (e.manipulation === "noController") {
+                    
+                    this.removeForeignController(this._audio);
+                    this._audio.destructor();
+                    this._audio = null;
+                    this._createPlayingInfrastructure();
+                }
                 break;
             case "initialPlaying":
+                if (e.manipulation === "noController") {
+                    this._player.pause();
+                    
+                    this.removeForeignController(this._audio);
+                    this.audio.destructor();
+                    this._audio = null;
+                    this._createPlayingInfrastructure();
+                }
                 break;
+            case "controllerNotReady":
+                break
+            case "controllerNotReadyPlaying":
+                break
             case "hasController":
                 break;
             case "hasControllerPlaying":
                 if (this._audio.hasMore()) {
                     this._audio.requestMore();
+                    
+                    this._player.play();    //todo temporal
                 } else {
                     this._fsm.manipulation("noMoreFrames");
                 }
@@ -249,10 +283,30 @@ var Player = Controller.inherit({
         }
     },
     _removeControl: function(type) {
-        //TODO
+        var ctrl = this.controls[type];
+        if (ctrl !== undefined) {
+            this.trigger("removeElement", type);
+            this.removeController(ctrl);
+            ctrl.destructor();
+        }
     },
     _removeView: function(type) {
-        //TODO
+        var view = this.views[type];
+        if (view !== undefined) {
+            this.trigger("removeElement", type);
+            
+            if (type !== ItemType.straight.picture) {
+                this.removeController(view);
+            }
+            if (type === ItemType.straight.currentPlayback) {
+                if (this.views[ItemType.straight.picture]) {
+                    this._removeView(ItemType.straight.picture);
+                }
+                this._fsm.manipulation("noController");
+            }
+            delete this.views[type];
+            view.destructor();
+        }
     }
 });
 
@@ -261,6 +315,8 @@ ItemType.add("playPause");
 ItemType.add("currentPlayback");
 ItemType.add("queue");
 ItemType.add("picture");
+ItemType.add("prev");
+ItemType.add("next");
 
 var PlayerMode = new Enum("PlayerMode");
 PlayerMode.add("playback");
@@ -270,34 +326,48 @@ Player.ItemType = ItemType;
 var graphs = Object.create(null);
 graphs[PlayerMode.straight.playback] = {
     "initial": {
-        controller: "hasController",
+        controller: "controllerNotReady",
         play: "initialPlaying"
     },
     "initialPlaying": {
         pause: "initial",
-        controller: "hasControllerPlaying"
+        controller: "controllerNotReadyPlaying"
+    },
+    "controllerNotReady": {
+        play: "controllerNotReadyPlaying",
+        controllerReady: "hasController"
+    },
+    "controllerNotReadyPlaying": {
+        pause: "controllerNotReady",
+        controllerReady: "hasControllerPlaying"
     },
     "hasController": {
         newFrames: "paused",
-        play: "hasControllerPlaying"
+        play: "hasControllerPlaying",
+        noController: "initial"
     },
     "hasControllerPlaying": {
         newFrames: "playing",
-        pause: "hasController"
+        pause: "hasController",
+        noController: "initialPlaying"
     },
     "paused": {
         play: "playing",
+        noController: "initial",
         noMoreFrames: "pausedAllLoaded"
     },
     "pausedAllLoaded": {
-        play: "playingAllLoaded"
+        play: "playingAllLoaded",
+        noController: "initial"
     },
     "playing": {
         pause: "paused",
-        noMoreFrames: "playingAllLoaded"
+        noMoreFrames: "playingAllLoaded",
+        noController: "initialPlaying"
     },
     "playingAllLoaded": {
-        pause: "pausedAllLoaded"
+        pause: "pausedAllLoaded",
+        noController: "initialPlaying"
     }
 }
 

lorgar/core/lorgar.js

@@ -142,6 +142,9 @@
                 
                 this._emptyHelper = new LocalModel();
                 
+                this._gc.on("serviceMessage", this._onServiceMessage, this);
+                this._ps.on("serviceMessage", this._onServiceMessage, this);
+                
                 this._gc.on("themeSelected", this.setTheme, this);
                 this._ps.on("pageName", this._onPageName, this);
             },
@@ -175,6 +178,24 @@
                     address: this._currentPageCtl.getPairAddress().toArray()
                 }, "", name);
             },
+            "_onServiceMessage": function(text, severity) {
+                var fn;
+                
+                switch (severity) {
+                    case 2:
+                        fn = console.error;
+                        break;
+                    case 1:
+                        fn = console.warn;
+                        break;
+                    case 0:
+                    default:
+                        fn = console.info;
+                        break;
+                }
+                
+                fn(text);
+            },
             "_onSocketConnected": function(name) {
                 console.log(name + " socket connected");
                 var node = this._nodes[name];
@@ -301,6 +322,8 @@
                 this._playerCtl.register(this.dispatcher, this._nodes["Corax"].socket);
                 this._playerCtl.subscribe();
                 this._mainLayout.appendPlayer(this._playerCtl);
+                
+                this._playerCtl.on("serviceMessage", this._onServiceMessage, this);
             },
             "setTheme": function(theme) {
                 View.setTheme(theme);

lorgar/css/main.css

@@ -47,5 +47,13 @@ div.dragging .draggable {
 }
 
 .disabled {
-    opacity: 0.7;
+    opacity: 0.5;
+}
+
+.button {
+    cursor: pointer
+}
+
+.button.disabled {
+    cursor: not-allowed
 }

lorgar/views/button.js

@@ -20,6 +20,7 @@
                 Layout.fn.constructor.call(this, controller, base);
                 
                 this.addClass("hoverable");
+                this.addClass("button");
                 this._enabled = true;
                 this._hasLabel = false;
                 this._e.addEventListener("click", this._onClick.bind(this), false);
@@ -27,10 +28,8 @@
                 controller.on("setEnabled", this._onSetEnabled, this);
                 controller.on("setLabel", this._onSetLabel, this);
                 
-                if (controller.initialized) {
                 this._onSetEnabled(controller.enabled);
                 this._onSetLabel(controller.hasLabel, controller.label);
-                }
             },
             "destructor": function() {
                 this._f.off("setEnabled", this._onSetEnabled, this);

lorgar/views/player.js

@@ -30,6 +30,8 @@
                 GridLayout.fn.constructor.call(this, ctrl, options);
                 
                 this._playPause = null;
+                this._prev = null;
+                this._next = null;
                 this._picture = null;
                 this._cpbCtrl = null;
                 this._infoModels = {
@@ -39,16 +41,17 @@
                 }
                 
                 ctrl.on("newElement", this._onNewElement, this);
+                ctrl.on("removeElement", this._onRemoveElement, this);
                 
                 var artist = new Label(this._infoModels.artist);
                 var album = new Label(this._infoModels.album);
                 var song = new Label(this._infoModels.song);
                 var spacer = new View(helper);
                 
-                this.append(artist, 0, 2, 1, 1, GridLayout.Aligment.LeftCenter);
+                this.append(artist, 0, 4, 1, 1, GridLayout.Aligment.LeftCenter);
-                this.append(song, 1, 2, 1, 1, GridLayout.Aligment.LeftCenter);
+                this.append(song, 1, 4, 1, 1, GridLayout.Aligment.LeftCenter);
-                this.append(album, 2, 2, 1, 1, GridLayout.Aligment.LeftCenter);
+                this.append(album, 2, 4, 1, 1, GridLayout.Aligment.LeftCenter);
-                this.append(spacer, 0, 3, 3, 1, GridLayout.Aligment.LeftCenter);
+                this.append(spacer, 0, 5, 3, 1, GridLayout.Aligment.LeftCenter);
                 
                 this._uncyclic.push(this._infoModels.artist.destructor.bind(this._infoModels.artist));
                 this._uncyclic.push(this._infoModels.song.destructor.bind(this._infoModels.song));
@@ -56,6 +59,7 @@
             },
             destructor: function() {
                 this._f.off("newElement", this._onNewElement, this);
+                this._f.off("removeElement", this._onRemoveElement, this);
                 this._clearCpbCtrl();
                 
                 GridLayout.fn.destructor.call(this);
@@ -73,7 +77,15 @@
                 switch (type) {
                     case ItemType.straight.playPause:
                         this._playPause = new Button(ctrl);
-                        this.append(this._playPause, 0, 1, 3, 1);
+                        this.append(this._playPause, 0, 2, 3, 1);
+                        break;
+                    case ItemType.straight.prev:
+                        this._prev = new Button(ctrl);
+                        this.append(this._prev, 0, 1, 3, 1);
+                        break;
+                    case ItemType.straight.next:
+                        this._next = new Button(ctrl);
+                        this.append(this._next, 0, 3, 3, 1);
                         break;
                     case ItemType.straight.queue:
                         break;
@@ -92,6 +104,33 @@
                         break;
                 }
             },
+            _onRemoveElement: function(type) {
+                var ItemType = Enum.storage["ItemType"];
+                
+                switch (type) {
+                    case ItemType.straight.playPause:
+                        this._playPause.destructor();
+                        this._playPause = null;
+                        break;
+                    case ItemType.straight.prev:
+                        this._prev.destructor();
+                        this._prev = null;
+                        break;
+                    case ItemType.straight.next:
+                        this._next.destructor();
+                        this._next = null;
+                        break;
+                    case ItemType.straight.queue:
+                        break;
+                    case ItemType.straight.currentPlayback:
+                        this._clearCpbCtrl();
+                        break;
+                    case ItemType.straight.picture:
+                        this._picture.destructor();
+                        this._picture = null;
+                        break;
+                }
+            },
             _onCpbNewElement: function(key, value) {
                 var model = this._infoModels[key];