ClassicStyle: template-based derivation from native style

First attempts to get away from QPlastiqueStyle as the default style
and instead dynamically use an overloaded version of the native style.
Still needs lots of tuning, especially regarding colors.

include/classic_style.h

@@ -26,11 +26,13 @@
 #ifndef _CLASSIC_STYLE_H
 #define _CLASSIC_STYLE_H
 
-#include <QtGui/QPlastiqueStyle>
+#include <QtGui/QStyle>
+
 #include "lmms_style.h"
 
 
-class ClassicStyle : public QPlastiqueStyle, public LmmsStyle
+template<class BaseStyle>
+class ClassicStyle : public BaseStyle, public LmmsStyle
 {
 public:
 	ClassicStyle();
@@ -43,16 +45,18 @@ public:
 	virtual QPalette standardPalette() const;
 
 	virtual void drawComplexControl(
-				ComplexControl control,
+				QStyle::ComplexControl control,
 				const QStyleOptionComplex * option,
 					QPainter *painter,
 						const QWidget *widget ) const;
-	virtual void drawPrimitive( PrimitiveElement element,
+	virtual void drawPrimitive(
+					QStyle::PrimitiveElement element,
 					const QStyleOption *option,
 					QPainter *painter,
 					const QWidget *widget = 0 ) const;
 
-	virtual int pixelMetric( PixelMetric metric,
+	virtual int pixelMetric(
+					QStyle::PixelMetric metric,
 					const QStyleOption * option = 0,
 					const QWidget * widget = 0 ) const;
 
@@ -69,11 +73,14 @@ public:
 	virtual void drawTrackContentObject( QPainter * _painter, const trackContentObject * _model,
 			const LmmsStyleOptionTCO * _options );
 
-	private:
+private:
 	QImage colorizeXpm( const char * const * xpm, const QBrush & fill ) const;
 
 	QColor colors[LmmsStyle::NumColorRoles];
 
 };
 
+
+QPair<QStyle *, LmmsStyle *> classicStyleSpecializationForBaseStyle( QStyle * baseStyle );
+
 #endif