First version of artwork tabs for the InstrumentTrackWindow.

This version can only display & manage artwork tabs, which breaks
the InstrumentSoundShapingView as it still uses text tabs.

I'm planing to improve this implementation to let these artwork tabs fall back
to text mode when no artwork is given. This would solve the problem of the
InstrumentSoundShapingView.

include/TabWidget.h

@@ -29,6 +29,7 @@
 #include <QWidget>
 #include <QtCore/QMap>
 
+#include <string>
 
 class TabWidget : public QWidget
 {
@@ -37,7 +38,7 @@ public:
 	TabWidget( const QString & _caption, QWidget * _parent );
 	virtual ~TabWidget();
 
-	void addTab( QWidget * _w, const QString & _name, int _idx = -1 );
+	void addTab( QWidget * _w, const QString & _name, const char * pixmapName, int _idx = -1 );
 
 	void setActiveTab( int _idx );
 
@@ -57,9 +58,10 @@ protected:
 private:
 	struct widgetDesc
 	{
-		QWidget * w;	// ptr to widget
-		QString name;	// name for widget
-		int nwidth;	// width of name when painting
+		QWidget       * w;	   // ptr to widget
+		const char    *pixmapName; // artwork for the widget 
+		QString       name;	   // name for widget
+		int           nwidth;	   // width of name when painting
 	} ;
 	typedef QMap<int, widgetDesc> widgetStack;