fixed deleting default widget

src/board/UBFeaturesController.cpp

@@ -40,6 +40,10 @@ bool UBFeature::isFolder() const
 		|| elementType == FEATURE_FOLDER;
 }
 
+bool UBFeature::isDeletable()const
+{
+	return elementType == FEATURE_ITEM;
+}
 
 UBFeaturesController::UBFeaturesController(QWidget *pParentWidget) :
         QObject(pParentWidget),
@@ -281,6 +285,12 @@ QPixmap UBFeaturesController::thumbnailForFile(const QString &path)
 	return thumb;
 }
 
+bool UBFeaturesController::isDeletable( const QUrl &url )
+{
+	UBFeatureElementType type = fileTypeFromUrl( fileNameFromUrl(url) );
+	return type == FEATURE_ITEM;
+}
+
 QPixmap UBFeaturesController::createThumbnail(const QString &path)
 {
     QString thumbnailPath = UBFileSystemUtils::thumbnailPath(path);

src/board/UBFeaturesController.h

@@ -37,6 +37,7 @@ public:
 	QString getVirtualPath() const { return  virtualPath + "/" + mName; }
     UBFeatureElementType getType() const { return elementType; }
 	bool isFolder() const;
+	bool isDeletable() const;
 	bool operator ==( const UBFeature &f )const;
 	bool operator !=( const UBFeature &f )const;
 private:
@@ -74,6 +75,7 @@ public:
 
 	static QString fileNameFromUrl( const QUrl &url );
 	static QPixmap thumbnailForFile( const QString &path );
+	static bool isDeletable( const QUrl &url );
 private:
 	void initDirectoryTree();
 	void fileSystemScan(const QString &currPath, const QString & currVirtualPath);

src/gui/UBFeaturesActionBar.cpp

@@ -179,14 +179,22 @@ void UBFeaturesActionBar::dragMoveEvent(QDragMoveEvent *event)
 void UBFeaturesActionBar::dragEnterEvent( QDragEnterEvent *event )
 {
     if (event->mimeData()->hasFormat("text/uri-list"))
+	{
         event->acceptProposedAction();
 	}
+}
 
 void UBFeaturesActionBar::dropEvent( QDropEvent *event )
 {	
 	QWidget *dest = childAt( event->pos() );
 	if ( dest == mpDeleteBtn )
 	{
+		QList <QUrl> urls = event->mimeData()->urls();
+		foreach ( QUrl url, urls )
+		{
+			if ( !UBFeaturesController::isDeletable( url ) )
+				return;
+		}
 		event->setDropAction( Qt::MoveAction );
 		event->accept();
 		emit deleteElements( *event->mimeData() );