diff --git a/src/kernel/qstyle.cpp b/src/kernel/qstyle.cpp
index 75d448d..c7f4ef4 100644
--- a/src/kernel/qstyle.cpp
+++ b/src/kernel/qstyle.cpp
@@ -54,7 +54,6 @@
 
 #include <limits.h>
 
-
 class QStylePrivate
 {
 public:
@@ -495,7 +494,7 @@ void QStyle::unPolish( QWidget *widget ) {
 
     \sa unPolish()
 */
-void QStyle::polish( QStyleControlElementData ceData, ControlElementFlags, void *ptr ) {
+void QStyle::polish( const QStyleControlElementData &ceData, ControlElementFlags, void *ptr ) {
 	if (ceData.widgetObjectTypes.contains("QWidget")) {
 		// Enable dynamic hide/show of accelerator shortcuts
 		QWidget* widget = reinterpret_cast<QWidget*>(ptr);
@@ -513,7 +512,7 @@ void QStyle::polish( QStyleControlElementData ceData, ControlElementFlags, void
 
     \sa polish()
 */
-void QStyle::unPolish( QStyleControlElementData ceData, ControlElementFlags, void *ptr ) {
+void QStyle::unPolish( const QStyleControlElementData &ceData, ControlElementFlags, void *ptr ) {
 	if (ceData.widgetObjectTypes.contains("QWidget")) {
 		// Disable dynamic hide/show of accelerator shortcuts
 		QWidget* widget = reinterpret_cast<QWidget*>(ptr);
@@ -555,7 +554,7 @@ void QStyle::unPolish( QApplication *app ) {
 
     \sa unPolish()
 */
-void QStyle::applicationPolish( QStyleControlElementData, ControlElementFlags, void * ) {
+void QStyle::applicationPolish( const QStyleControlElementData&, ControlElementFlags, void * ) {
 	//
 }
 
@@ -571,7 +570,7 @@ void QStyle::applicationPolish( QStyleControlElementData, ControlElementFlags, v
 
     \sa polish()
 */
-void QStyle::applicationUnPolish( QStyleControlElementData, ControlElementFlags, void * ) {
+void QStyle::applicationUnPolish( const QStyleControlElementData&, ControlElementFlags, void * ) {
 	//
 }
 
@@ -605,7 +604,7 @@ void QStyle::polishPopupMenu( QPopupMenu *pm ) {
     (\l{QPopupMenu::setMouseTracking()}) and whether the menu is
     checkable by default (\l{QPopupMenu::setCheckable()}).
 */
-void QStyle::polishPopupMenu( QStyleControlElementData, ControlElementFlags, void * )
+void QStyle::polishPopupMenu( const QStyleControlElementData&, ControlElementFlags, void * )
 {
 }
 
@@ -909,7 +908,7 @@ void QStyle::drawItem( QPainter *p, const QRect &r,
 */
 
 /*!
-    \fn void QStyle::drawPrimitive( PrimitiveElement pe, QPainter *p, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QRect &r, const QColorGroup &cg, SFlags flags, const QStyleOption& opt) const
+    \fn void QStyle::drawPrimitive( PrimitiveElement pe, QPainter *p, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QRect &r, const QColorGroup &cg, SFlags flags, const QStyleOption& opt) const
 
     Draws the style PrimitiveElement \a pe using the painter \a p in
     the area \a r. Colors are used from the color group \a cg.
@@ -1042,7 +1041,7 @@ void QStyle::drawItem( QPainter *p, const QRect &r,
 */
 
 /*!
-    \fn void QStyle::drawControl( ControlElement element, QPainter *p, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QRect &r, const QColorGroup &cg, SFlags how, const QStyleOption& opt, const QWidget *widget) const
+    \fn void QStyle::drawControl( ControlElement element, QPainter *p, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QRect &r, const QColorGroup &cg, SFlags how, const QStyleOption& opt, const QWidget *widget) const
 
     Draws the ControlElement \a element using the painter \a p in the
     area \a r. Colors are used from the color group \a cg.
@@ -1201,7 +1200,7 @@ void QStyle::drawItem( QPainter *p, const QRect &r,
 */
 
 /*!
-    \fn void QStyle::drawControlMask( ControlElement element, QPainter *p, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QRect &r, const QStyleOption& opt, const QWidget *widget) const
+    \fn void QStyle::drawControlMask( ControlElement element, QPainter *p, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QRect &r, const QStyleOption& opt, const QWidget *widget) const
 
     Draw a bitmask for the ControlElement \a element using the painter
     \a p in the area \a r. See drawControl() for an explanation of the
@@ -1274,7 +1273,7 @@ void QStyle::drawItem( QPainter *p, const QRect &r,
 */
 
 /*!
-    \fn QRect QStyle::subRect( SubRect subrect, const QStyleControlElementData ceData, const ControlElementFlags elementFlags, const QWidget *widget ) const;
+    \fn QRect QStyle::subRect( SubRect subrect, const QStyleControlElementData &ceData, const ControlElementFlags elementFlags, const QWidget *widget ) const;
 
     Returns the sub-area \a subrect for the \a widget in logical
     coordinates.
@@ -1406,7 +1405,7 @@ void QStyle::drawItem( QPainter *p, const QRect &r,
 */
 
 /*!
-    \fn void QStyle::drawComplexControl( ComplexControl control, QPainter *p, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QRect &r, const QColorGroup &cg, SFlags how, SCFlags sub, SCFlags subActive, const QStyleOption& opt, const QWidget *widget ) const
+    \fn void QStyle::drawComplexControl( ComplexControl control, QPainter *p, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QRect &r, const QColorGroup &cg, SFlags how, SCFlags sub, SCFlags subActive, const QStyleOption& opt, const QWidget *widget ) const
 
     Draws the ComplexControl \a control using the painter \a p in the
     area \a r. Colors are used from the color group \a cg. The \a sub
@@ -1504,7 +1503,7 @@ void QStyle::drawItem( QPainter *p, const QRect &r,
 */
 
 /*!
-    \fn void QStyle::drawComplexControlMask( ComplexControl control, QPainter *p, const QStyleControlElementData ceData, const ControlElementFlags elementFlags, const QRect &r, const QStyleOption& opt, const QWidget *widget) const
+    \fn void QStyle::drawComplexControlMask( ComplexControl control, QPainter *p, const QStyleControlElementData &ceData, const ControlElementFlags elementFlags, const QRect &r, const QStyleOption& opt, const QWidget *widget) const
 
     Draw a bitmask for the ComplexControl \a control using the painter
     \a p in the area \a r. See drawComplexControl() for an explanation
@@ -1524,7 +1523,7 @@ void QStyle::drawItem( QPainter *p, const QRect &r,
 */
 
 /*!
-    \fn QRect QStyle::querySubControlMetrics( ComplexControl control, QStyleControlElementData ceData, ControlElementFlags elementFlags, SubControl subcontrol, const QStyleOption& opt = QStyleOption::Default, const QWidget *widget = 0 ) const;
+    \fn QRect QStyle::querySubControlMetrics( ComplexControl control, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, SubControl subcontrol, const QStyleOption& opt = QStyleOption::Default, const QWidget *widget = 0 ) const;
 
     Returns the rect for the SubControl \a subcontrol for \a widget in
     logical coordinates.
@@ -1546,7 +1545,7 @@ void QStyle::drawItem( QPainter *p, const QRect &r,
 */
 
 /*!
-    \fn SubControl QStyle::querySubControl( ComplexControl control, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QPoint &pos, const QStyleOption& opt = QStyleOption::Default, const QWidget *widget = 0 ) const;
+    \fn SubControl QStyle::querySubControl( ComplexControl control, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QPoint &pos, const QStyleOption& opt = QStyleOption::Default, const QWidget *widget = 0 ) const;
 
     Returns the SubControl for \a widget at the point \a pos. The \a
     widget argument is a pointer to a QWidget or one of its
@@ -1672,7 +1671,7 @@ void QStyle::drawItem( QPainter *p, const QRect &r,
 */
 
 /*!
-    \fn int QStyle::pixelMetric( PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 ) const;
+    \fn int QStyle::pixelMetric( PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 ) const;
 
     Returns the pixel metric for \a metric.
 
@@ -1734,7 +1733,7 @@ void QStyle::drawItem( QPainter *p, const QRect &r,
 */
 
 /*!
-    \fn QSize QStyle::sizeFromContents( ContentsType contents, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QSize &contentsSize, const QStyleOption& opt = QStyleOption::Default, const QWidget *widget = 0 ) const;
+    \fn QSize QStyle::sizeFromContents( ContentsType contents, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QSize &contentsSize, const QStyleOption& opt = QStyleOption::Default, const QWidget *widget = 0 ) const;
 
     Returns the size of \a widget based on the contents size \a
     contentsSize.
@@ -1924,7 +1923,7 @@ void QStyle::drawItem( QPainter *p, const QRect &r,
 */
 
 /*!
-    \fn int QStyle::styleHint( StyleHint stylehint, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QStyleOption &opt = QStyleOption::Default, QStyleHintReturn *returnData = 0, const QWidget *widget = 0 ) const;
+    \fn int QStyle::styleHint( StyleHint stylehint, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QStyleOption &opt = QStyleOption::Default, QStyleHintReturn *returnData = 0, const QWidget *widget = 0 ) const;
 
     Returns the style hint \a stylehint for \a widget. Currently, \a
     widget, \a opt, and \a returnData are unused; they're included to
@@ -1971,7 +1970,7 @@ void QStyle::drawItem( QPainter *p, const QRect &r,
 */
 
 /*!
-    \fn QPixmap QStyle::stylePixmap( StylePixmap stylepixmap, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QStyleOption& opt = QStyleOption::Default, const QWidget *widget = 0 ) const;
+    \fn QPixmap QStyle::stylePixmap( StylePixmap stylepixmap, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QStyleOption& opt = QStyleOption::Default, const QWidget *widget = 0 ) const;
 
     Returns a pixmap for \a stylepixmap.
 
@@ -2011,7 +2010,7 @@ void QStyle::drawItem( QPainter *p, const QRect &r,
     function is provided to aid style implementors in supporting
     right-to-left mode.
 
-    Note that this function is deprecated in favor of visualRect( const QRect &logical, const QStyleControlElementData ceData, const ControlElementFlags elementFlags );
+    Note that this function is deprecated in favor of visualRect( const QRect &logical, const QStyleControlElementData &ceData, const ControlElementFlags elementFlags );
 
     \sa QApplication::reverseLayout()
 */
@@ -2023,7 +2022,7 @@ QRect QStyle::visualRect( const QRect &logical, const QWidget *w )
 }
 
 /*!
-    \fn QRect QStyle::visualRect( const QRect &logical, const QStyleControlElementData ceData, const ControlElementFlags elementFlags );
+    \fn QRect QStyle::visualRect( const QRect &logical, const QStyleControlElementData &ceData, const ControlElementFlags elementFlags );
 
     Returns the rect \a logical in screen coordinates. The bounding
     rect for the widget described by \a ceData and \a elementFlags
@@ -2033,7 +2032,7 @@ QRect QStyle::visualRect( const QRect &logical, const QWidget *w )
 
     \sa QApplication::reverseLayout()
 */
-QRect QStyle::visualRect( const QRect &logical, const QStyleControlElementData ceData, const ControlElementFlags elementFlags )
+QRect QStyle::visualRect( const QRect &logical, const QStyleControlElementData &ceData, const ControlElementFlags elementFlags )
 {
     Q_UNUSED(elementFlags)
 
@@ -2065,15 +2064,15 @@ QRect QStyle::visualRect( const QRect &logical, const QRect &boundingRect )
 }
 
 /*!
-    \fn void QStyle::installObjectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler );
+    \fn void QStyle::installObjectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler );
 
     Intercepts events generated by \a source and sends them to \a handler via
-    the bool QStyle::objectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QEvent *e ) virtual method.
+    the bool QStyle::objectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QEvent *e ) virtual method.
 
     \sa void QStyle::removeObjectEventHandler( QObject* source, QStyle* handler )
-    \sa bool QStyle::objectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QEvent *e )
+    \sa bool QStyle::objectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QEvent *e )
 */
-void QStyle::installObjectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler ) {
+void QStyle::installObjectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler ) {
 	bool cbret = false;
 	if (m_eventHandlerInstallationHook) {
 		cbret = (*m_eventHandlerInstallationHook)(ceData, elementFlags, source, handler);
@@ -2090,13 +2089,13 @@ void QStyle::installObjectEventHandler( QStyleControlElementData ceData, Control
 }
 
 /*!
-    \fn void QStyle::removeObjectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler );
+    \fn void QStyle::removeObjectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler );
 
     Stops intercepting events generated by \a source.
 
-    \sa void QStyle::installObjectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
+    \sa void QStyle::installObjectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
 */
-void QStyle::removeObjectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler ) {
+void QStyle::removeObjectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler ) {
 	bool cbret = false;
 	if (m_eventHandlerRemovalHook) {
 		cbret = (*m_eventHandlerRemovalHook)(ceData, elementFlags, source, handler);
@@ -2117,9 +2116,9 @@ void QStyle::removeObjectEventHandler( QStyleControlElementData ceData, ControlE
 
     Sets a callback function \a hook which will be called whenever a new intercept request
     is made via the QStyle::installObjectEventHandler method.  The callback function must
-    use this definition: bool callbackFunction( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler ).
+    use this definition: bool callbackFunction( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler ).
 
-    \sa void QStyle::installObjectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
+    \sa void QStyle::installObjectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
 */
 void QStyle::setEventHandlerInstallationHook( EventHandlerInstallationHook hook ) {
 	m_eventHandlerInstallationHook = hook;
@@ -2130,24 +2129,24 @@ void QStyle::setEventHandlerInstallationHook( EventHandlerInstallationHook hook
 
     Sets a callback function \a hook which will be called whenever a new intercept deactivation request
     is made via the QStyle::removeObjectEventHandler method.  The callback function must
-    use this definition: bool callbackFunction( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler ).
+    use this definition: bool callbackFunction( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler ).
 
-    \sa void QStyle::removeObjectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
+    \sa void QStyle::removeObjectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
 */
 void QStyle::setEventHandlerRemovalHook( EventHandlerRemovalHook hook ) {
 	m_eventHandlerRemovalHook = hook;
 }
 
 /*!
-    \fn bool QStyle::objectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QEvent *e );
+    \fn bool QStyle::objectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QEvent *e );
 
     Override this virtual function to intercept events requested by a previous call to
     QStyle::installObjectEventHandler.
 
-    \sa void QStyle::installObjectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
-    \sa void QStyle::removeObjectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
+    \sa void QStyle::installObjectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
+    \sa void QStyle::removeObjectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
 */
-bool QStyle::objectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QEvent *e ) {
+bool QStyle::objectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QEvent *e ) {
 	Q_UNUSED(ceData);
 	Q_UNUSED(elementFlags);
 	Q_UNUSED(source);
@@ -2193,20 +2192,20 @@ bool QStyle::eventFilter(QObject *o, QEvent *e) {
 
     Sets a callback function \a hook which will be called whenever a new widget action request
     is made via the QStyle::installObjectEventHandler method.  The callback function must
-    use this definition: bool callbackFunction( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler ).
+    use this definition: bool callbackFunction( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler ).
 
-    \sa void QStyle::installObjectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
+    \sa void QStyle::installObjectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
 */
 void QStyle::setWidgetActionRequestHook( WidgetActionRequestHook hook ) {
 	m_widgetActionRequestHook = hook;
 }
 
 /*!
-    \fn bool widgetActionRequestHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, WidgetActionRequest request );
+    \fn bool widgetActionRequestHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, WidgetActionRequest request );
 
     Handles widget action requests.  Return FALSE to continue processing in base classes, TRUE to eat the request and halt processing.
 */
-bool QStyle::widgetActionRequest( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, WidgetActionRequest request, QStyleWidgetActionRequestData requestData ) {
+bool QStyle::widgetActionRequest( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, WidgetActionRequest request, QStyleWidgetActionRequestData requestData ) {
 	bool cbret = false;
 	if (m_widgetActionRequestHook) {
 		cbret = (*m_widgetActionRequestHook)(ceData, elementFlags, source, request, requestData);
@@ -2327,20 +2326,20 @@ bool QStyle::widgetActionRequest( QStyleControlElementData ceData, ControlElemen
 
     Sets a callback function \a hook which will be called whenever a new application action request
     is made via the QStyle::installObjectEventHandler method.  The callback function must
-    use this definition: bool callbackFunction( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler ).
+    use this definition: bool callbackFunction( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler ).
 
-    \sa void QStyle::installObjectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
+    \sa void QStyle::installObjectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler )
 */
 void QStyle::setApplicationActionRequestHook( ApplicationActionRequestHook hook ) {
 	m_applicationActionRequestHook = hook;
 }
 
 /*!
-    \fn bool applicationActionRequestHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, ApplicationActionRequest request );
+    \fn bool applicationActionRequestHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, ApplicationActionRequest request );
 
     Handles application action requests.  Return FALSE to continue processing in base classes, TRUE to eat the request and halt processing.
 */
-bool QStyle::applicationActionRequest( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, ApplicationActionRequest request, QStyleApplicationActionRequestData requestData ) {
+bool QStyle::applicationActionRequest( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, ApplicationActionRequest request, QStyleApplicationActionRequestData requestData ) {
 	bool cbret = false;
 	if (m_applicationActionRequestHook) {
 		cbret = (*m_applicationActionRequestHook)(ceData, elementFlags, source, request, requestData);
@@ -2609,6 +2608,7 @@ QPixmap QStyle::stylePixmap(StylePixmap sp, const QWidget *w, const QStyleOption
 */
 
 QStyleControlElementData::QStyleControlElementData() {
+	isNull = true;
 	activePainter = 0;
 	tickMarkSetting = 0;
 	comboBoxLineEditFlags = 0;
diff --git a/src/kernel/qstyle.h b/src/kernel/qstyle.h
index 63acec6..cf7a235 100644
--- a/src/kernel/qstyle.h
+++ b/src/kernel/qstyle.h
@@ -228,6 +228,10 @@ class QStyleControlElementTabBarData {
 
 class Q_EXPORT QStyleControlElementData {
 	public:
+		QStyleControlElementData();
+
+	public:
+		bool isNull;
 		QStringList widgetObjectTypes;
 		bool allDataPopulated;
 		Qt::WFlags wflags;
@@ -286,9 +290,6 @@ class Q_EXPORT QStyleControlElementData {
 		QString caption;
 		QStyleControlElementGenericWidgetData topLevelWidgetData;
 		Q_UINT32 topLevelWidgetFlags;
-
-	public:
-		QStyleControlElementData();
 };
 
 class Q_EXPORT QStyleWidgetActionRequestData {
@@ -360,28 +361,28 @@ public:
     virtual void polish( QWidget * );
 
     // New API
-    virtual void polish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void * );
+    virtual void polish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void * );
 
     // Old API
     // DEPRECATED
     virtual void unPolish( QWidget * );
 
     // New API
-    virtual void unPolish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void * );
+    virtual void unPolish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void * );
 
     // Old API
     // DEPRECATED
     virtual void polish( QApplication * );
 
     // New API
-    virtual void applicationPolish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void * );
+    virtual void applicationPolish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void * );
 
     // Old API
     // DEPRECATED
     virtual void unPolish( QApplication * );
 
     // New API
-    virtual void applicationUnPolish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void * );
+    virtual void applicationUnPolish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void * );
 
     virtual void polish( QPalette & );
 
@@ -390,7 +391,7 @@ public:
     virtual void polishPopupMenu( QPopupMenu* );
 
     // New API
-    virtual void polishPopupMenu( QStyleControlElementData ceData, ControlElementFlags elementFlags, void * ) = 0;
+    virtual void polishPopupMenu( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void * ) = 0;
 
     virtual QRect itemRect( QPainter *p, const QRect &r,
 			    int flags, bool enabled,
@@ -521,7 +522,7 @@ public:
     // New API
     virtual void drawPrimitive( PrimitiveElement pe,
 				QPainter *p,
-				QStyleControlElementData ceData,
+				const QStyleControlElementData &ceData,
 				ControlElementFlags elementFlags,
 				const QRect &r,
 				const QColorGroup &cg,
@@ -576,7 +577,7 @@ public:
     // New API
     virtual void drawControl( ControlElement element,
 			      QPainter *p,
-			      QStyleControlElementData ceData,
+			      const QStyleControlElementData &ceData,
 			      ControlElementFlags elementFlags,
 			      const QRect &r,
 			      const QColorGroup &cg,
@@ -595,7 +596,7 @@ public:
     // New API
     virtual void drawControlMask( ControlElement element,
 				  QPainter *p,
-				  QStyleControlElementData ceData,
+				  const QStyleControlElementData &ceData,
 				  ControlElementFlags elementFlags,
 				  const QRect &r,
 				  const QStyleOption& = QStyleOption::Default,
@@ -646,7 +647,7 @@ public:
     virtual QRect subRect( SubRect r, const QWidget *widget ) const;
 
     // New API
-    virtual QRect subRect( SubRect r, const QStyleControlElementData ceData, const ControlElementFlags elementFlags, const QWidget *widget ) const = 0;
+    virtual QRect subRect( SubRect r, const QStyleControlElementData &ceData, const ControlElementFlags elementFlags, const QWidget *widget ) const = 0;
 
 
     enum ComplexControl{
@@ -728,7 +729,7 @@ public:
 
     virtual void drawComplexControl( ComplexControl control,
 				     QPainter *p,
-				     QStyleControlElementData ceData,
+				     const QStyleControlElementData &ceData,
 				     ControlElementFlags elementFlags,
 				     const QRect &r,
 				     const QColorGroup &cg,
@@ -753,7 +754,7 @@ public:
     // New API
     virtual void drawComplexControlMask( ComplexControl control,
 					 QPainter *p,
-					 const QStyleControlElementData ceData,
+					 const QStyleControlElementData &ceData,
 					 const ControlElementFlags elementFlags,
 					 const QRect &r,
 					 const QStyleOption& = QStyleOption::Default,
@@ -768,7 +769,7 @@ public:
 
     // New API
     virtual QRect querySubControlMetrics( ComplexControl control,
-					  QStyleControlElementData ceData,
+					  const QStyleControlElementData &ceData,
 					  ControlElementFlags elementFlags,
 					  SubControl sc,
 					  const QStyleOption& = QStyleOption::Default,
@@ -783,7 +784,7 @@ public:
 
     // New API
     virtual SubControl querySubControl( ComplexControl control,
-					QStyleControlElementData ceData,
+					const QStyleControlElementData &ceData,
 					ControlElementFlags elementFlags,
 					const QPoint &pos,
 					const QStyleOption& = QStyleOption::Default,
@@ -872,7 +873,7 @@ public:
 
     // New API
     virtual int pixelMetric( PixelMetric metric,
-			     QStyleControlElementData ceData,
+			     const QStyleControlElementData &ceData,
 			     ControlElementFlags elementFlags,
 			     const QWidget *widget = 0 ) const = 0;
 
@@ -909,7 +910,7 @@ public:
 				    const QStyleOption& = QStyleOption::Default ) const;
 
     virtual QSize sizeFromContents( ContentsType contents,
-				    QStyleControlElementData ceData,
+				    const QStyleControlElementData &ceData,
 				    ControlElementFlags elementFlags,
 				    const QSize &contentsSize,
 				    const QStyleOption& = QStyleOption::Default,
@@ -1083,7 +1084,7 @@ public:
 
     // New API
     virtual int styleHint( StyleHint stylehint,
-			   QStyleControlElementData ceData,
+			   const QStyleControlElementData &ceData,
 			   ControlElementFlags elementFlags,
 			   const QStyleOption& = QStyleOption::Default,
 			   QStyleHintReturn* returnData = 0,
@@ -1115,7 +1116,7 @@ public:
 				 const QStyleOption& = QStyleOption::Default ) const;
 
     virtual QPixmap stylePixmap( StylePixmap stylepixmap,
-				 QStyleControlElementData ceData,
+				 const QStyleControlElementData &ceData,
 				 ControlElementFlags elementFlags,
 				 const QStyleOption& = QStyleOption::Default,
 				 const QWidget *widget = 0 ) const = 0;
@@ -1126,7 +1127,7 @@ public:
     static QRect visualRect( const QRect &logical, const QWidget *w );
 
     // New API
-    static QRect visualRect( const QRect &logical, const QStyleControlElementData ceData, const ControlElementFlags elementFlags );
+    static QRect visualRect( const QRect &logical, const QStyleControlElementData &ceData, const ControlElementFlags elementFlags );
 
     static QRect visualRect( const QRect &logical, const QRect &bounding );
 
@@ -1135,13 +1136,13 @@ public:
     typedef QMap<void*, QStyle*> ObjectEventSourceToHandlerMap;
     typedef QMap<void*, QStyleControlElementData> ObjectEventSourceDataToHandlerMap;
     typedef QMap<void*, ControlElementFlags> ObjectEventSourceFlagsToHandlerMap;
-    typedef bool (*EventHandlerInstallationHook)(QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler);
-    typedef bool (*EventHandlerRemovalHook)(QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler);
-    void installObjectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler );
-    void removeObjectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QStyle* handler );
+    typedef bool (*EventHandlerInstallationHook)(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler);
+    typedef bool (*EventHandlerRemovalHook)(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler);
+    void installObjectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler );
+    void removeObjectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QStyle* handler );
     void setEventHandlerInstallationHook( EventHandlerInstallationHook );
     void setEventHandlerRemovalHook( EventHandlerRemovalHook hook );
-    virtual bool objectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QEvent *e );
+    virtual bool objectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QEvent *e );
 
     enum WidgetActionRequest {
 	WAR_Repaint,
@@ -1165,37 +1166,40 @@ public:
 	WAR_SendPaintEvent
     };
 
-    typedef bool (*WidgetActionRequestHook)(QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, WidgetActionRequest request, QStyleWidgetActionRequestData requestData);
+    typedef bool (*WidgetActionRequestHook)(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, WidgetActionRequest request, QStyleWidgetActionRequestData requestData);
     void setWidgetActionRequestHook( WidgetActionRequestHook );
-    virtual bool widgetActionRequest( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, WidgetActionRequest request, QStyleWidgetActionRequestData requestData = QStyleWidgetActionRequestData() );
+    virtual bool widgetActionRequest( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, WidgetActionRequest request, QStyleWidgetActionRequestData requestData = QStyleWidgetActionRequestData() );
 
     enum ApplicationActionRequest {
 	AAR_SetPalette,
 	AAR_SetFont
     };
 
-    typedef bool (*ApplicationActionRequestHook)(QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, ApplicationActionRequest request, QStyleApplicationActionRequestData requestData);
+    typedef bool (*ApplicationActionRequestHook)(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, ApplicationActionRequest request, QStyleApplicationActionRequestData requestData);
     void setApplicationActionRequestHook( ApplicationActionRequestHook );
-    virtual bool applicationActionRequest( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, ApplicationActionRequest request, QStyleApplicationActionRequestData requestData = QStyleApplicationActionRequestData() );
+    virtual bool applicationActionRequest( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, ApplicationActionRequest request, QStyleApplicationActionRequestData requestData = QStyleApplicationActionRequestData() );
 
     // Old 2.x QStyle API
 
 #ifndef QT_NO_COMPAT
     int defaultFrameWidth() const
     {
-	return pixelMetric( PM_DefaultFrameWidth, QStyleControlElementData(), CEF_None );
+	QStyleControlElementData ceData;
+	return pixelMetric( PM_DefaultFrameWidth, ceData, CEF_None );
     }
     void tabbarMetrics( const QWidget* t,
 			int& hf, int& vf, int& ov ) const
     {
-	hf = pixelMetric( PM_TabBarTabHSpace, QStyleControlElementData(), CEF_None, t );
-	vf = pixelMetric( PM_TabBarTabVSpace, QStyleControlElementData(), CEF_None, t );
-	ov = pixelMetric( PM_TabBarBaseOverlap, QStyleControlElementData(), CEF_None, t );
+	QStyleControlElementData ceData;
+	hf = pixelMetric( PM_TabBarTabHSpace, ceData, CEF_None, t );
+	vf = pixelMetric( PM_TabBarTabVSpace, ceData, CEF_None, t );
+	ov = pixelMetric( PM_TabBarBaseOverlap, ceData, CEF_None, t );
     }
     QSize scrollBarExtent() const
     {
-	return QSize(pixelMetric(PM_ScrollBarExtent, QStyleControlElementData(), CEF_None),
-		     pixelMetric(PM_ScrollBarExtent, QStyleControlElementData(), CEF_None));
+	QStyleControlElementData ceData;
+	return QSize(pixelMetric(PM_ScrollBarExtent, ceData, CEF_None),
+		     pixelMetric(PM_ScrollBarExtent, ceData, CEF_None));
     }
 #endif
 
diff --git a/src/kernel/qwidget.cpp b/src/kernel/qwidget.cpp
index 28328b8..704681d 100644
--- a/src/kernel/qwidget.cpp
+++ b/src/kernel/qwidget.cpp
@@ -1184,6 +1184,9 @@ void QWidget::createExtra()
 #endif
 	extra->size_policy = QSizePolicy( QSizePolicy::Preferred,
 					  QSizePolicy::Preferred );
+
+	extra->m_ceData = NULL;
+
 	createSysExtra();
     }
 }
@@ -3591,7 +3594,15 @@ bool QWidget::isActiveWindow() const
     if(tlw == qApp->activeWindow() || ( isVisible() && tlw->isPopup() ))
 	return TRUE;
 #ifndef QT_NO_STYLE
-    if(style().styleHint(QStyle::SH_Widget_ShareActivation, this )) {
+    const_cast<QWidget*>(this)->createExtra();
+    if (!extra->m_ceData) {
+        const_cast<QWidget*>(this)->extra->m_ceData = new QStyleControlElementData();
+    }
+    //extra->m_ceData->widgetObjectTypes = getObjectTypeListForObject(this);
+    extra->m_ceData->widgetObjectTypes.clear();
+    extra->m_ceData->allDataPopulated = false;
+    //if(style().styleHint(QStyle::SH_Widget_ShareActivation, *extra->m_ceData, getControlElementFlagsForObject(this, extra->m_ceData->widgetObjectTypes, QStyleOption(), false), QStyleOption(), NULL, this)) {
+    if(style().styleHint(QStyle::SH_Widget_ShareActivation, *extra->m_ceData, QStyle::CEF_None, QStyleOption(), NULL, this)) {
         if((tlw->isDialog() || (tlw->testWFlags(Qt::WStyle_Tool) && !tlw->isPopup())) &&
            !tlw->testWFlags(Qt::WShowModal) &&
            (!tlw->parentWidget() || tlw->parentWidget()->isActiveWindow()))
diff --git a/src/kernel/qwidget.h b/src/kernel/qwidget.h
index 9df9710..44bb24e 100644
--- a/src/kernel/qwidget.h
+++ b/src/kernel/qwidget.h
@@ -63,6 +63,7 @@ class QFocusData;
 class QCursor;
 class QWSRegionManager;
 class QStyle;
+class QStyleControlElementData;
 
 class Q_EXPORT QWidget : public QObject, public QPaintDevice
 {
@@ -1086,6 +1087,7 @@ struct Q_EXPORT QWExtra {
 #endif
     QRect micro_focus_hint;			// micro focus hint
     QSizePolicy size_policy;
+    QStyleControlElementData* m_ceData;
 };
 
 #define Q_DEFINED_QWIDGET
diff --git a/src/styles/qcdestyle.cpp b/src/styles/qcdestyle.cpp
index 3719462..629acb8 100644
--- a/src/styles/qcdestyle.cpp
+++ b/src/styles/qcdestyle.cpp
@@ -87,7 +87,7 @@ QCDEStyle::~QCDEStyle()
 
 /*!\reimp
 */
-int QCDEStyle::pixelMetric( PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget ) const
+int QCDEStyle::pixelMetric( PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget ) const
 {
     int ret;
 
@@ -112,7 +112,7 @@ int QCDEStyle::pixelMetric( PixelMetric metric, QStyleControlElementData ceData,
 */
 void QCDEStyle::drawControl( ControlElement element,
 			     QPainter *p,
-			     QStyleControlElementData ceData,
+			     const QStyleControlElementData &ceData,
 			     ControlElementFlags elementFlags,
 			     const QRect &r,
 			     const QColorGroup &cg,
@@ -144,7 +144,7 @@ void QCDEStyle::drawControl( ControlElement element,
 */
 void QCDEStyle::drawPrimitive( PrimitiveElement pe,
 			       QPainter *p,
-			       QStyleControlElementData ceData,
+			       const QStyleControlElementData &ceData,
 			       ControlElementFlags elementFlags,
 			       const QRect &r,
 			       const QColorGroup &cg,
diff --git a/src/styles/qcdestyle.h b/src/styles/qcdestyle.h
index 3dee332..6a4c562 100644
--- a/src/styles/qcdestyle.h
+++ b/src/styles/qcdestyle.h
@@ -62,11 +62,11 @@ public:
     QCDEStyle( bool useHighlightCols = FALSE );
     virtual ~QCDEStyle();
 
-    int pixelMetric( PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 ) const;
+    int pixelMetric( PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 ) const;
 
     void drawControl( ControlElement element,
 		      QPainter *p,
-		      QStyleControlElementData ceData,
+		      const QStyleControlElementData &ceData,
 		      ControlElementFlags elementFlags,
 		      const QRect &r,
 		      const QColorGroup &cg,
@@ -76,7 +76,7 @@ public:
 
     void drawPrimitive( PrimitiveElement pe,
 			QPainter *p,
-			QStyleControlElementData ceData,
+			const QStyleControlElementData &ceData,
 			ControlElementFlags elementFlags,
 			const QRect &r,
 			const QColorGroup &cg,
diff --git a/src/styles/qcommonstyle.cpp b/src/styles/qcommonstyle.cpp
index b49bef2..a44ee9f 100644
--- a/src/styles/qcommonstyle.cpp
+++ b/src/styles/qcommonstyle.cpp
@@ -258,6 +258,7 @@ QStyleControlElementData populateControlElementDataFromWidget(const QWidget* wid
 	QStyleControlElementData ceData;
 
 	if (widget) {
+		ceData.isNull = false;
 		ceData.widgetObjectTypes = getObjectTypeListForObject(widget);
 		ceData.allDataPopulated = populateReliantFields & populateMinimumNumberOfFields;
 		if (!populateMinimumNumberOfFields) {
@@ -695,7 +696,7 @@ QStyleControlElementData populateControlElementDataFromApplication(const QApplic
 /*! \reimp */
 void QCommonStyle::drawPrimitive( PrimitiveElement pe,
 				  QPainter *p,
-				  QStyleControlElementData ceData,
+				  const QStyleControlElementData &ceData,
 				  ControlElementFlags elementFlags,
 				  const QRect &r,
 				  const QColorGroup &cg,
@@ -1173,7 +1174,7 @@ void qt_style_erase_region(QPainter* p, const QRegion& region, QStyleControlElem
 /*! \reimp */
 void QCommonStyle::drawControl( ControlElement element,
 				QPainter *p,
-				QStyleControlElementData ceData,
+				const QStyleControlElementData &ceData,
 				ControlElementFlags elementFlags,
 				const QRect &r,
 				const QColorGroup &cg,
@@ -1619,7 +1620,7 @@ void QCommonStyle::drawControl( ControlElement element,
 	{
 	    QRect rect = r;
 
-	    QIconSet* icon = &ceData.iconSet;
+	    const QIconSet* icon = &ceData.iconSet;
 	    if ( icon ) {
 		QPixmap pixmap = icon->pixmap( QIconSet::Small,
 					       flags & Style_Enabled ?
@@ -1653,7 +1654,7 @@ void QCommonStyle::drawControl( ControlElement element,
 /*! \reimp */
 void QCommonStyle::drawControlMask( ControlElement control,
 				QPainter *p,
-				QStyleControlElementData ceData,
+				const QStyleControlElementData &ceData,
 				ControlElementFlags elementFlags,
 				const QRect &r,
 				const QStyleOption& opt,
@@ -1689,7 +1690,7 @@ void QCommonStyle::drawControlMask( ControlElement control,
 }
 
 /*! \reimp */
-QRect QCommonStyle::subRect(SubRect r, const QStyleControlElementData ceData, const ControlElementFlags elementFlags, const QWidget *widget) const
+QRect QCommonStyle::subRect(SubRect r, const QStyleControlElementData &ceData, const ControlElementFlags elementFlags, const QWidget *widget) const
 {
     QRect rect, wrect(ceData.rect);
 
@@ -1985,7 +1986,7 @@ QRect QCommonStyle::subRect(SubRect r, const QStyleControlElementData ceData, co
 /*
   I really need this and I don't want to expose it in QRangeControl..
 */
-static int qPositionFromValue( QStyleControlElementData ceData, int logical_val,
+static int qPositionFromValue( const QStyleControlElementData &ceData, int logical_val,
 			       int span )
 {
     if ( span <= 0 || logical_val < ceData.minSteps ||
@@ -2018,7 +2019,7 @@ static int qPositionFromValue( QStyleControlElementData ceData, int logical_val,
 /*! \reimp */
 void QCommonStyle::drawComplexControl( ComplexControl control,
 				       QPainter *p,
-				       QStyleControlElementData ceData,
+				       const QStyleControlElementData &ceData,
 				       ControlElementFlags elementFlags,
 				       const QRect &r,
 				       const QColorGroup &cg,
@@ -2420,7 +2421,7 @@ void QCommonStyle::drawComplexControl( ComplexControl control,
 /*! \reimp */
 void QCommonStyle::drawComplexControlMask( ComplexControl control,
 					   QPainter *p,
-					   const QStyleControlElementData ceData,
+					   const QStyleControlElementData &ceData,
 					   const ControlElementFlags elementFlags,
 					   const QRect &r,
 					   const QStyleOption& opt,
@@ -2437,7 +2438,7 @@ void QCommonStyle::drawComplexControlMask( ComplexControl control,
 
 /*! \reimp */
 QRect QCommonStyle::querySubControlMetrics( ComplexControl control,
-					    QStyleControlElementData ceData,
+					    const QStyleControlElementData &ceData,
 					    ControlElementFlags elementFlags,
 					    SubControl sc,
 					    const QStyleOption &opt,
@@ -2671,7 +2672,7 @@ QRect QCommonStyle::querySubControlMetrics( ComplexControl control,
 
 /*! \reimp */
 QStyle::SubControl QCommonStyle::querySubControl(ComplexControl control,
-						 QStyleControlElementData ceData,
+						 const QStyleControlElementData &ceData,
 						 ControlElementFlags elementFlags,
 						 const QPoint &pos,
 						 const QStyleOption& opt,
@@ -2746,7 +2747,7 @@ QStyle::SubControl QCommonStyle::querySubControl(ComplexControl control,
 }
 
 /*! \reimp */
-int QCommonStyle::pixelMetric(PixelMetric m, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget) const
+int QCommonStyle::pixelMetric(PixelMetric m, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget) const
 {
     int ret;
 
@@ -2970,7 +2971,7 @@ int QCommonStyle::pixelMetric(PixelMetric m, QStyleControlElementData ceData, Co
 
 /*! \reimp */
 QSize QCommonStyle::sizeFromContents(ContentsType contents,
-				     QStyleControlElementData ceData,
+				     const QStyleControlElementData &ceData,
 				     ControlElementFlags elementFlags,
 				     const QSize &contentsSize,
 				     const QStyleOption& opt,
@@ -3140,7 +3141,7 @@ QSize QCommonStyle::sizeFromContents(ContentsType contents,
 }
 
 /*! \reimp */
-int QCommonStyle::styleHint(StyleHint sh, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QStyleOption &, QStyleHintReturn *, const QWidget * w) const
+int QCommonStyle::styleHint(StyleHint sh, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QStyleOption &, QStyleHintReturn *, const QWidget * w) const
 {
     Q_UNUSED(w);
 
@@ -3223,7 +3224,7 @@ int QCommonStyle::styleHint(StyleHint sh, QStyleControlElementData ceData, Contr
 }
 
 /*! \reimp */
-QPixmap QCommonStyle::stylePixmap(StylePixmap, QStyleControlElementData, ControlElementFlags, const QStyleOption&, const QWidget *) const
+QPixmap QCommonStyle::stylePixmap(StylePixmap, const QStyleControlElementData&, ControlElementFlags, const QStyleOption&, const QWidget *) const
 {
     return QPixmap();
 }
diff --git a/src/styles/qcommonstyle.h b/src/styles/qcommonstyle.h
index c445740..114822a 100644
--- a/src/styles/qcommonstyle.h
+++ b/src/styles/qcommonstyle.h
@@ -58,7 +58,7 @@ public:
     // New API
     void drawPrimitive( PrimitiveElement pe,
 			QPainter *p,
-			QStyleControlElementData ceData,
+			const QStyleControlElementData &ceData,
 			ControlElementFlags elementFlags,
 			const QRect &r,
 			const QColorGroup &cg,
@@ -68,7 +68,7 @@ public:
     // New API
     void drawControl( ControlElement element,
 			QPainter *p,
-			QStyleControlElementData ceData,
+			const QStyleControlElementData &ceData,
 			ControlElementFlags elementFlags,
 			const QRect &r,
 			const QColorGroup &cg,
@@ -79,19 +79,19 @@ public:
     // New API
     void drawControlMask( ControlElement element,
 			QPainter *p,
-			QStyleControlElementData ceData,
+			const QStyleControlElementData &ceData,
 			ControlElementFlags elementFlags,
 			const QRect &r,
 			const QStyleOption& = QStyleOption::Default,
 			const QWidget *widget = 0 ) const;
 
     // New API
-    QRect subRect( SubRect r, const QStyleControlElementData ceData, const ControlElementFlags elementFlags, const QWidget *widget ) const;
+    QRect subRect( SubRect r, const QStyleControlElementData &ceData, const ControlElementFlags elementFlags, const QWidget *widget ) const;
 
     // New API
     void drawComplexControl( ComplexControl control,
 			     QPainter *p,
-			     QStyleControlElementData ceData,
+			     const QStyleControlElementData &ceData,
 			     ControlElementFlags elementFlags,
 			     const QRect &r,
 			     const QColorGroup &cg,
@@ -108,7 +108,7 @@ public:
     // New API
     void drawComplexControlMask( ComplexControl control,
 				 QPainter *p,
-				 const QStyleControlElementData ceData,
+				 const QStyleControlElementData &ceData,
 				 const ControlElementFlags elementFlags,
 				 const QRect &r,
 				 const QStyleOption& = QStyleOption::Default,
@@ -116,7 +116,7 @@ public:
 
     // New API
     QRect querySubControlMetrics( ComplexControl control,
-				  QStyleControlElementData ceData,
+				  const QStyleControlElementData &ceData,
 				  ControlElementFlags elementFlags,
 				  SubControl sc,
 				  const QStyleOption& = QStyleOption::Default,
@@ -124,29 +124,29 @@ public:
 
     // New API
     SubControl querySubControl( ComplexControl control,
-				QStyleControlElementData ceData,
+				const QStyleControlElementData &ceData,
 				ControlElementFlags elementFlags,
 				const QPoint &pos,
 				const QStyleOption& = QStyleOption::Default,
 				const QWidget *widget = 0 ) const;
 
     // New API
-    int pixelMetric( PixelMetric m, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 ) const;
+    int pixelMetric( PixelMetric m, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 ) const;
 
     // New API
     QSize sizeFromContents( ContentsType s,
-			    QStyleControlElementData ceData,
+			    const QStyleControlElementData &ceData,
 			    ControlElementFlags elementFlags,
 			    const QSize &contentsSize,
 			    const QStyleOption& = QStyleOption::Default,
 			    const QWidget *widget = 0 ) const;
 
     // New API
-    int styleHint(StyleHint sh, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QStyleOption &, QStyleHintReturn *, const QWidget * w) const;
+    int styleHint(StyleHint sh, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QStyleOption &, QStyleHintReturn *, const QWidget * w) const;
 
     // New API
     QPixmap stylePixmap( StylePixmap sp,
-			 QStyleControlElementData ceData,
+			 const QStyleControlElementData &ceData,
 			 ControlElementFlags elementFlags,
 			 const QStyleOption& = QStyleOption::Default,
 			 const QWidget *widget = 0 ) const;
diff --git a/src/styles/qcompactstyle.cpp b/src/styles/qcompactstyle.cpp
index 63c5be5..e3236f2 100644
--- a/src/styles/qcompactstyle.cpp
+++ b/src/styles/qcompactstyle.cpp
@@ -55,7 +55,7 @@ QCompactStyle::QCompactStyle()
 }
 
 /*! \reimp */
-int QCompactStyle::pixelMetric( PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget )
+int QCompactStyle::pixelMetric( PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget )
 {
     int ret;
     switch ( metric ) {
@@ -151,7 +151,7 @@ void drawPopupMenuItem( QPainter*, bool,
 }
 
 /*! \reimp */
-void QCompactStyle::drawControl( ControlElement element, QPainter *p, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QRect &r,
+void QCompactStyle::drawControl( ControlElement element, QPainter *p, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QRect &r,
 		  const QColorGroup &g, SFlags flags, const QStyleOption& opt, const QWidget *widget )
 {
     switch ( element ) {
@@ -312,7 +312,7 @@ void QCompactStyle::drawControl( ControlElement element, QPainter *p, QStyleCont
 /*! \reimp */
 void QCompactStyle::drawPrimitive( PrimitiveElement pe,
 				  QPainter *p,
-				  QStyleControlElementData ceData,
+				  const QStyleControlElementData &ceData,
 				  ControlElementFlags elementFlags,
 				  const QRect &r,
 				  const QColorGroup &cg,
@@ -368,7 +368,7 @@ void QCompactStyle::drawPrimitive( PrimitiveElement pe,
 }
 
 /*! \reimp */
-int QCompactStyle::styleHint(StyleHint sh, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QStyleOption &opt, QStyleHintReturn *returnData, const QWidget *w) const
+int QCompactStyle::styleHint(StyleHint sh, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QStyleOption &opt, QStyleHintReturn *returnData, const QWidget *w) const
 {
 	int ret;
 
diff --git a/src/styles/qcompactstyle.h b/src/styles/qcompactstyle.h
index 6002055..682411d 100644
--- a/src/styles/qcompactstyle.h
+++ b/src/styles/qcompactstyle.h
@@ -58,21 +58,21 @@ class Q_EXPORT_STYLE_COMPACT QCompactStyle : public QWindowsStyle
 public:
     QCompactStyle();
 
-    int pixelMetric( PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 );
+    int pixelMetric( PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 );
 
     void drawPrimitive( PrimitiveElement pe,
 			QPainter *p,
-			QStyleControlElementData ceData,
+			const QStyleControlElementData &ceData,
 			ControlElementFlags elementFlags,
 			const QRect &r,
 			const QColorGroup &cg,
 			SFlags flags = Style_Default,
 			const QStyleOption& = QStyleOption::Default ) const;
 
-    void drawControl( ControlElement element, QPainter *p, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QRect &r,
+    void drawControl( ControlElement element, QPainter *p, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QRect &r,
 		      const QColorGroup &cg, SFlags how = Style_Default, const QStyleOption& = QStyleOption::Default, const QWidget *w = 0 );
 
-    int styleHint(StyleHint sh, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QStyleOption &, QStyleHintReturn *, const QWidget *) const;
+    int styleHint(StyleHint sh, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QStyleOption &, QStyleHintReturn *, const QWidget *) const;
 
 private:	// Disabled copy constructor and operator=
 #if defined(Q_DISABLE_COPY)
diff --git a/src/styles/qmotifplusstyle.cpp b/src/styles/qmotifplusstyle.cpp
index 113716c..34dc7fa 100644
--- a/src/styles/qmotifplusstyle.cpp
+++ b/src/styles/qmotifplusstyle.cpp
@@ -175,7 +175,7 @@ void QMotifPlusStyle::polish(QPalette &)
 
 
 /*! \reimp */
-void QMotifPlusStyle::polish(QStyleControlElementData ceData, ControlElementFlags elementFlags, void *ptr)
+void QMotifPlusStyle::polish(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *ptr)
 {
     if (ceData.widgetObjectTypes.contains("QWidget")) {
 #ifndef QT_NO_FRAME
@@ -212,7 +212,7 @@ void QMotifPlusStyle::polish(QStyleControlElementData ceData, ControlElementFlag
 
 
 /*! \reimp */
-void QMotifPlusStyle::unPolish(QStyleControlElementData ceData, ControlElementFlags elementFlags, void *ptr)
+void QMotifPlusStyle::unPolish(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *ptr)
 {
     removeObjectEventHandler(ceData, elementFlags, ptr, this);
     QMotifStyle::unPolish(ceData, elementFlags, ptr);
@@ -220,19 +220,19 @@ void QMotifPlusStyle::unPolish(QStyleControlElementData ceData, ControlElementFl
 
 
 /*! \reimp */
-void QMotifPlusStyle::applicationPolish(QStyleControlElementData, ControlElementFlags, void *)
+void QMotifPlusStyle::applicationPolish(const QStyleControlElementData&, ControlElementFlags, void *)
 {
 }
 
 
 /*! \reimp */
-void QMotifPlusStyle::applicationUnPolish(QStyleControlElementData, ControlElementFlags, void *)
+void QMotifPlusStyle::applicationUnPolish(const QStyleControlElementData&, ControlElementFlags, void *)
 {
 }
 
 
 /*! \reimp */
-int QMotifPlusStyle::pixelMetric(PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget) const
+int QMotifPlusStyle::pixelMetric(PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget) const
 {
     int ret;
 
@@ -282,7 +282,7 @@ int QMotifPlusStyle::pixelMetric(PixelMetric metric, QStyleControlElementData ce
 /*! \reimp */
 void QMotifPlusStyle::drawPrimitive( PrimitiveElement pe,
 				     QPainter *p,
-				     QStyleControlElementData ceData,
+				     const QStyleControlElementData &ceData,
 				     ControlElementFlags elementFlags,
 				     const QRect &r,
 				     const QColorGroup &cg,
@@ -700,7 +700,7 @@ void QMotifPlusStyle::drawPrimitive( PrimitiveElement pe,
 */
 void QMotifPlusStyle::drawControl( ControlElement element,
 				   QPainter *p,
-				   QStyleControlElementData ceData,
+				   const QStyleControlElementData &ceData,
 				   ControlElementFlags elementFlags,
 				   const QRect &r,
 				   const QColorGroup &cg,
@@ -1047,7 +1047,7 @@ void QMotifPlusStyle::drawControl( ControlElement element,
 
 /*! \reimp
 */
-QRect QMotifPlusStyle::subRect(SubRect r, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget) const
+QRect QMotifPlusStyle::subRect(SubRect r, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget) const
 {
     QRect rect;
 
@@ -1136,7 +1136,7 @@ QRect QMotifPlusStyle::subRect(SubRect r, QStyleControlElementData ceData, Contr
 /*! \reimp */
 void QMotifPlusStyle::drawComplexControl(ComplexControl control,
 			    QPainter *p,
-			    QStyleControlElementData ceData,
+			    const QStyleControlElementData &ceData,
 			    ControlElementFlags elementFlags,
 			    const QRect &r,
 			    const QColorGroup &cg,
@@ -1426,7 +1426,7 @@ void QMotifPlusStyle::drawComplexControl(ComplexControl control,
 /*! \reimp
 */
 QRect QMotifPlusStyle::querySubControlMetrics(ComplexControl control,
-					      QStyleControlElementData ceData,
+					      const QStyleControlElementData &ceData,
 					      ControlElementFlags elementFlags,
 					      SubControl subcontrol,
 					      const QStyleOption& opt,
@@ -1524,7 +1524,7 @@ QRect QMotifPlusStyle::querySubControlMetrics(ComplexControl control,
 
 
 /*! \reimp */
-bool QMotifPlusStyle::objectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QEvent *event )
+bool QMotifPlusStyle::objectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QEvent *event )
 {
     switch(event->type()) {
     case QEvent::MouseButtonPress:
@@ -1596,7 +1596,7 @@ bool QMotifPlusStyle::objectEventHandler( QStyleControlElementData ceData, Contr
 
 /*! \reimp */
 int QMotifPlusStyle::styleHint(StyleHint hint,
-			       QStyleControlElementData ceData,
+			       const QStyleControlElementData &ceData,
 			       ControlElementFlags elementFlags,
 			       const QStyleOption &opt,
 			       QStyleHintReturn *returnData,
diff --git a/src/styles/qmotifplusstyle.h b/src/styles/qmotifplusstyle.h
index 24de609..cf49425 100644
--- a/src/styles/qmotifplusstyle.h
+++ b/src/styles/qmotifplusstyle.h
@@ -63,15 +63,15 @@ public:
     virtual ~QMotifPlusStyle();
 
     void polish(QPalette &pal);
-    void polish(QStyleControlElementData ceData, ControlElementFlags elementFlags, void *);
-    void unPolish(QStyleControlElementData ceData, ControlElementFlags elementFlags, void *);
+    void polish(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *);
+    void unPolish(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *);
 
-    void applicationPolish(QStyleControlElementData ceData, ControlElementFlags elementFlags, void *);
-    void applicationUnPolish(QStyleControlElementData ceData, ControlElementFlags elementFlags, void *);
+    void applicationPolish(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *);
+    void applicationUnPolish(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *);
 
     void drawPrimitive( PrimitiveElement pe,
 			QPainter *p,
-			QStyleControlElementData ceData,
+			const QStyleControlElementData &ceData,
 			ControlElementFlags elementFlags,
 			const QRect &r,
 			const QColorGroup &cg,
@@ -80,7 +80,7 @@ public:
 
     void drawControl( ControlElement element,
 		      QPainter *p,
-		      QStyleControlElementData ceData,
+		      const QStyleControlElementData &ceData,
 		      ControlElementFlags elementFlags,
 		      const QRect &r,
 		      const QColorGroup &cg,
@@ -88,11 +88,11 @@ public:
 		      const QStyleOption& = QStyleOption::Default,
 		      const QWidget *widget = 0 ) const;
 
-    QRect subRect(SubRect r, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget) const;
+    QRect subRect(SubRect r, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget) const;
 
     void drawComplexControl(ComplexControl control,
 			    QPainter *p,
-			    QStyleControlElementData ceData,
+			    const QStyleControlElementData &ceData,
 			    ControlElementFlags elementFlags,
 			    const QRect &r,
 			    const QColorGroup &cg,
@@ -107,18 +107,18 @@ public:
 			    const QWidget *widget = 0 ) const;
 
     QRect querySubControlMetrics(ComplexControl control,
-				 QStyleControlElementData ceData,
+				 const QStyleControlElementData &ceData,
 				 ControlElementFlags elementFlags,
 				 SubControl subcontrol,
 				 const QStyleOption& = QStyleOption::Default,
 				 const QWidget *widget = 0) const;
 
-    int pixelMetric(PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget = 0) const;
+    int pixelMetric(PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget = 0) const;
 
-    int styleHint(StyleHint sh, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QStyleOption & = QStyleOption::Default,
+    int styleHint(StyleHint sh, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QStyleOption & = QStyleOption::Default,
 		  QStyleHintReturn* = 0, const QWidget * = 0) const;
 
-    bool objectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QEvent *e );
+    bool objectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QEvent *e );
 
 
 private:
diff --git a/src/styles/qmotifstyle.cpp b/src/styles/qmotifstyle.cpp
index 826cd16..e7b3fc6 100644
--- a/src/styles/qmotifstyle.cpp
+++ b/src/styles/qmotifstyle.cpp
@@ -171,7 +171,7 @@ void QMotifStyle::polish( QPalette& pal )
  \internal
  Keep QStyle::polish() visible.
 */
-void QMotifStyle::polish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void *ptr )
+void QMotifStyle::polish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *ptr )
 {
     QStyle::polish(ceData, elementFlags, ptr);
 }
@@ -181,7 +181,7 @@ void QMotifStyle::polish( QStyleControlElementData ceData, ControlElementFlags e
  \internal
  Keep QStyle::polish() visible.
 */
-void QMotifStyle::applicationPolish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void *ptr )
+void QMotifStyle::applicationPolish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *ptr )
 {
     QStyle::applicationPolish(ceData, elementFlags, ptr);
 }
@@ -204,7 +204,7 @@ static void rot(QPointArray& a, int n)
 */
 void QMotifStyle::drawPrimitive( PrimitiveElement pe,
 				 QPainter *p,
-				 QStyleControlElementData ceData,
+				 const QStyleControlElementData &ceData,
 				 ControlElementFlags elementFlags,
 				 const QRect &r,
 				 const QColorGroup &cg,
@@ -821,7 +821,7 @@ void QMotifStyle::drawPrimitive( PrimitiveElement pe,
 */
 void QMotifStyle::drawControl( ControlElement element,
 			       QPainter *p,
-			       QStyleControlElementData ceData,
+			       const QStyleControlElementData &ceData,
 			       ControlElementFlags elementFlags,
 			       const QRect &r,
 			       const QColorGroup &cg,
@@ -1257,7 +1257,7 @@ static void get_combo_parameters( const QRect &r,
 */
 void QMotifStyle::drawComplexControl( ComplexControl control,
 				     QPainter *p,
-				     QStyleControlElementData ceData,
+				     const QStyleControlElementData &ceData,
 				     ControlElementFlags elementFlags,
 				     const QRect &r,
 				     const QColorGroup &cg,
@@ -1500,7 +1500,7 @@ void QMotifStyle::drawComplexControl( ComplexControl control,
 
 
 /*! \reimp */
-int QMotifStyle::pixelMetric( PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget ) const
+int QMotifStyle::pixelMetric( PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget ) const
 {
      int ret;
 
@@ -1595,7 +1595,7 @@ int QMotifStyle::pixelMetric( PixelMetric metric, QStyleControlElementData ceDat
 /*!\reimp
 */
 QRect QMotifStyle::querySubControlMetrics( ComplexControl control,
-					   QStyleControlElementData ceData,
+					   const QStyleControlElementData &ceData,
 					   ControlElementFlags elementFlags,
 					   SubControl sc,
 					   const QStyleOption& opt,
@@ -1766,7 +1766,7 @@ QRect QMotifStyle::querySubControlMetrics( ComplexControl control,
 /*!\reimp
 */
 QSize QMotifStyle::sizeFromContents( ContentsType contents,
-				     QStyleControlElementData ceData,
+				     const QStyleControlElementData &ceData,
 				     ControlElementFlags elementFlags,
 				     const QSize &contentsSize,
 				     const QStyleOption& opt,
@@ -1846,7 +1846,7 @@ QSize QMotifStyle::sizeFromContents( ContentsType contents,
 
 /*!\reimp
 */
-QRect QMotifStyle::subRect( SubRect r, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget ) const
+QRect QMotifStyle::subRect( SubRect r, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget ) const
 {
     QRect rect;
     QRect wrect = ceData.rect;
@@ -1953,7 +1953,7 @@ QRect QMotifStyle::subRect( SubRect r, QStyleControlElementData ceData, ControlE
 
 /*! \reimp
 */
-void QMotifStyle::polishPopupMenu( QStyleControlElementData ceData, ControlElementFlags elementFlags, void *ptr )
+void QMotifStyle::polishPopupMenu( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *ptr )
 {
 #ifndef QT_NO_POPUPMENU
     if ( !(ceData.windowState & WState_Polished ) ) {
@@ -2269,7 +2269,7 @@ static const char *const question_xpm[] = {
  \reimp
  */
 QPixmap QMotifStyle::stylePixmap(StylePixmap sp,
-				 QStyleControlElementData ceData,
+				 const QStyleControlElementData &ceData,
 				 ControlElementFlags elementFlags,
 				 const QStyleOption& opt,
 				 const QWidget *widget) const
@@ -2355,7 +2355,7 @@ QPixmap QMotifStyle::stylePixmap(StylePixmap sp,
 
 /*! \reimp */
 int QMotifStyle::styleHint(StyleHint hint,
-			   QStyleControlElementData ceData,
+			   const QStyleControlElementData &ceData,
 			   ControlElementFlags elementFlags,
 			   const QStyleOption &opt,
 			   QStyleHintReturn *returnData,
diff --git a/src/styles/qmotifstyle.h b/src/styles/qmotifstyle.h
index 31ec525..31541f6 100644
--- a/src/styles/qmotifstyle.h
+++ b/src/styles/qmotifstyle.h
@@ -67,15 +67,15 @@ public:
     bool useHighlightColors() const;
 
     void polish( QPalette& );
-    void polish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void * );
-    void applicationPolish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void * );
+    void polish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void * );
+    void applicationPolish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void * );
 
-    void polishPopupMenu( QStyleControlElementData ceData, ControlElementFlags elementFlags, void * );
+    void polishPopupMenu( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void * );
 
     // new style API
     void drawPrimitive( PrimitiveElement pe,
 			QPainter *p,
-			QStyleControlElementData ceData,
+			const QStyleControlElementData &ceData,
 			ControlElementFlags elementFlags,
 			const QRect &r,
 			const QColorGroup &cg,
@@ -84,7 +84,7 @@ public:
 
     void drawControl( ControlElement element,
 		      QPainter *p,
-		      QStyleControlElementData ceData,
+		      const QStyleControlElementData &ceData,
 		      ControlElementFlags elementFlags,
 		      const QRect &r,
 		      const QColorGroup &cg,
@@ -94,7 +94,7 @@ public:
 
     void drawComplexControl( ComplexControl control,
 			     QPainter *p,
-			     QStyleControlElementData ceData,
+			     const QStyleControlElementData &ceData,
 			     ControlElementFlags elementFlags,
 			     const QRect& r,
 			     const QColorGroup& cg,
@@ -109,26 +109,26 @@ public:
 			     const QWidget* widget = 0 ) const;
 
     QRect querySubControlMetrics( ComplexControl control,
-				  QStyleControlElementData ceData,
+				  const QStyleControlElementData &ceData,
 				  ControlElementFlags elementFlags,
 				  SubControl sc,
 				  const QStyleOption& = QStyleOption::Default,
 				  const QWidget *widget = 0 ) const;
 
-    int pixelMetric( PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 ) const;
+    int pixelMetric( PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 ) const;
 
     QSize sizeFromContents( ContentsType contents,
-			    QStyleControlElementData ceData,
+			    const QStyleControlElementData &ceData,
 			    ControlElementFlags elementFlags,
 			    const QSize &contentsSize,
 			    const QStyleOption& = QStyleOption::Default,
 			    const QWidget *widget = 0 ) const;
 
-    QRect subRect( SubRect r, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget ) const;
+    QRect subRect( SubRect r, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget ) const;
 
-    QPixmap stylePixmap(StylePixmap, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QStyleOption& = QStyleOption::Default, const QWidget * = 0) const;
+    QPixmap stylePixmap(StylePixmap, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QStyleOption& = QStyleOption::Default, const QWidget * = 0) const;
 
-    int styleHint(StyleHint sh, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QStyleOption & = QStyleOption::Default,
+    int styleHint(StyleHint sh, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QStyleOption & = QStyleOption::Default,
 		  QStyleHintReturn* = 0, const QWidget * = 0) const;
 
 private:
diff --git a/src/styles/qplatinumstyle.cpp b/src/styles/qplatinumstyle.cpp
index ff583e0..0cf5d11 100644
--- a/src/styles/qplatinumstyle.cpp
+++ b/src/styles/qplatinumstyle.cpp
@@ -86,7 +86,7 @@ QPlatinumStyle::~QPlatinumStyle()
  */
 void QPlatinumStyle::drawPrimitive( PrimitiveElement pe,
 				    QPainter *p,
-				    QStyleControlElementData ceData,
+				    const QStyleControlElementData &ceData,
 				    ControlElementFlags elementFlags,
 				    const QRect &r,
 				    const QColorGroup &cg,
@@ -742,7 +742,7 @@ void QPlatinumStyle::drawPrimitive( PrimitiveElement pe,
  */
 void QPlatinumStyle::drawControl( ControlElement element,
 				  QPainter *p,
-				  QStyleControlElementData ceData,
+				  const QStyleControlElementData &ceData,
 				  ControlElementFlags elementFlags,
 				  const QRect &r,
 				  const QColorGroup &cg,
@@ -932,7 +932,7 @@ void QPlatinumStyle::drawControl( ControlElement element,
  */
 void QPlatinumStyle::drawComplexControl( ComplexControl control,
 					 QPainter *p,
-					 QStyleControlElementData ceData,
+					 const QStyleControlElementData &ceData,
 					 ControlElementFlags elementFlags,
 					 const QRect &r,
 					 const QColorGroup &cg,
@@ -1320,7 +1320,7 @@ void QPlatinumStyle::drawComplexControl( ComplexControl control,
 /*!\reimp
  */
 QRect QPlatinumStyle::querySubControlMetrics( ComplexControl control,
-					      QStyleControlElementData ceData,
+					      const QStyleControlElementData &ceData,
 					      ControlElementFlags elementFlags,
 					      SubControl sc,
 					      const QStyleOption& opt,
@@ -1432,7 +1432,7 @@ QRect QPlatinumStyle::querySubControlMetrics( ComplexControl control,
 
 /*!\reimp
  */
-int QPlatinumStyle::pixelMetric( PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags,
+int QPlatinumStyle::pixelMetric( PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags,
 				 const QWidget *widget ) const
 {
     int ret;
@@ -1469,7 +1469,7 @@ int QPlatinumStyle::pixelMetric( PixelMetric metric, QStyleControlElementData ce
 
 /*!\reimp
  */
-QRect QPlatinumStyle::subRect( SubRect r, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget ) const
+QRect QPlatinumStyle::subRect( SubRect r, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget ) const
 {
     QRect rect;
     switch ( r ) {
diff --git a/src/styles/qplatinumstyle.h b/src/styles/qplatinumstyle.h
index 6bf409f..13cc866 100644
--- a/src/styles/qplatinumstyle.h
+++ b/src/styles/qplatinumstyle.h
@@ -65,7 +65,7 @@ public:
     // new Style Stuff
     void drawPrimitive( PrimitiveElement pe,
 			QPainter *p,
-			QStyleControlElementData ceData,
+			const QStyleControlElementData &ceData,
 			ControlElementFlags elementFlags,
 			const QRect &r,
 			const QColorGroup &cg,
@@ -74,7 +74,7 @@ public:
 
     void drawControl( ControlElement element,
 		      QPainter *p,
-		      QStyleControlElementData ceData,
+		      const QStyleControlElementData &ceData,
 		      ControlElementFlags elementFlags,
 		      const QRect &r,
 		      const QColorGroup &cg,
@@ -84,7 +84,7 @@ public:
 
     void drawComplexControl( ComplexControl control,
 			     QPainter *p,
-			     QStyleControlElementData ceData,
+			     const QStyleControlElementData &ceData,
 			     ControlElementFlags elementFlags,
 			     const QRect &r,
 			     const QColorGroup &cg,
@@ -99,15 +99,15 @@ public:
 			     const QWidget *widget = 0 ) const;
 
     QRect querySubControlMetrics( ComplexControl control,
-				  QStyleControlElementData ceData,
+				  const QStyleControlElementData &ceData,
 				  ControlElementFlags elementFlags,
 				  SubControl sc,
 				  const QStyleOption& = QStyleOption::Default,
 				  const QWidget *widget = 0 ) const;
 
-    int pixelMetric( PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 ) const;
+    int pixelMetric( PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 ) const;
 
-    QRect subRect( SubRect r, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget ) const;
+    QRect subRect( SubRect r, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget ) const;
 
 protected:
      QColor mixedColor(const QColor &, const QColor &) const;
diff --git a/src/styles/qsgistyle.cpp b/src/styles/qsgistyle.cpp
index eb59d11..1728f69 100644
--- a/src/styles/qsgistyle.cpp
+++ b/src/styles/qsgistyle.cpp
@@ -136,7 +136,7 @@ QSGIStyle::~QSGIStyle()
     bold italic font for menu options.
 */
 void
-QSGIStyle::applicationPolish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void *ptr )
+QSGIStyle::applicationPolish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *ptr )
 {
     isApplicationStyle = 1;
     QMotifStyle::polish( ceData, elementFlags, ptr );
@@ -181,7 +181,7 @@ QSGIStyle::applicationPolish( QStyleControlElementData ceData, ControlElementFla
 /*! \reimp
 */
 void
-QSGIStyle::applicationUnPolish( QStyleControlElementData, ControlElementFlags, void * )
+QSGIStyle::applicationUnPolish( const QStyleControlElementData&, ControlElementFlags, void * )
 {
     QFont f = QApplication::font();
     QApplication::setFont( f, TRUE ); // get rid of the special fonts for special widget classes
@@ -194,7 +194,7 @@ QSGIStyle::applicationUnPolish( QStyleControlElementData, ControlElementFlags, v
     hovering.
 */
 void
-QSGIStyle::polish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void *ptr )
+QSGIStyle::polish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *ptr )
 {
     QMotifStyle::polish(ceData, elementFlags, ptr);
 
@@ -269,7 +269,7 @@ QSGIStyle::polish( QStyleControlElementData ceData, ControlElementFlags elementF
 
 /*! \reimp */
 void
-QSGIStyle::unPolish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void *ptr )
+QSGIStyle::unPolish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *ptr )
 {
     if ( (ceData.widgetObjectTypes.contains("QButton")) || (ceData.widgetObjectTypes.contains("QSlider")) || (ceData.widgetObjectTypes.contains("QScrollBar")) ) {
         removeObjectEventHandler(ceData, elementFlags, ptr, this);
@@ -286,7 +286,7 @@ QSGIStyle::unPolish( QStyleControlElementData ceData, ControlElementFlags elemen
 }
 
 /*! \reimp */
-bool QSGIStyle::objectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QEvent *e )
+bool QSGIStyle::objectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QEvent *e )
 {
     if ( (!(ceData.widgetObjectTypes.contains("QWidget"))) || (e->type() == QEvent::Paint) )
 	return QMotifStyle::objectEventHandler( ceData, elementFlags, source, e );
@@ -375,7 +375,7 @@ static const int sgiTabSpacing 		= 12;   // space between text and tab
 static const int sgiCheckMarkSpace      = 20;
 
 /*! \reimp */
-int QSGIStyle::pixelMetric( PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget ) const
+int QSGIStyle::pixelMetric( PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget ) const
 {
     switch ( metric ) {
     case PM_DefaultFrameWidth:
@@ -560,7 +560,7 @@ static void get_combo_parameters( const QRect &r,
 /*! \reimp */
 void QSGIStyle::drawPrimitive( PrimitiveElement pe,
 		    QPainter *p,
-		    QStyleControlElementData ceData,
+		    const QStyleControlElementData &ceData,
 		    ControlElementFlags elementFlags,
 		    const QRect &r,
 		    const QColorGroup &cg,
@@ -943,7 +943,7 @@ void QSGIStyle::drawPrimitive( PrimitiveElement pe,
 /*! \reimp */
 void QSGIStyle::drawControl( ControlElement element,
 		  QPainter *p,
-		  QStyleControlElementData ceData,
+		  const QStyleControlElementData &ceData,
 		  ControlElementFlags elementFlags,
 		  const QRect &r,
 		  const QColorGroup &cg,
@@ -1186,7 +1186,7 @@ void QSGIStyle::drawControl( ControlElement element,
 /*! \reimp */
 void QSGIStyle::drawComplexControl( ComplexControl control,
 			 QPainter *p,
-			 QStyleControlElementData ceData,
+			 const QStyleControlElementData &ceData,
 			 ControlElementFlags elementFlags,
 			 const QRect& r,
 			 const QColorGroup& cg,
@@ -1407,7 +1407,7 @@ void QSGIStyle::drawComplexControl( ComplexControl control,
 /*!\reimp
 */
 QSize QSGIStyle::sizeFromContents( ContentsType contents,
-				     QStyleControlElementData ceData,
+				     const QStyleControlElementData &ceData,
 				     ControlElementFlags elementFlags,
 				     const QSize &contentsSize,
 				     const QStyleOption& opt,
@@ -1447,7 +1447,7 @@ QSize QSGIStyle::sizeFromContents( ContentsType contents,
 }
 
 /*! \reimp */
-QRect QSGIStyle::subRect( SubRect r, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget ) const
+QRect QSGIStyle::subRect( SubRect r, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget ) const
 {
     QRect rect;
 
@@ -1472,7 +1472,7 @@ QRect QSGIStyle::subRect( SubRect r, QStyleControlElementData ceData, ControlEle
 
 /*! \reimp */
 QRect QSGIStyle::querySubControlMetrics( ComplexControl control,
-					   QStyleControlElementData ceData,
+					   const QStyleControlElementData &ceData,
 					   ControlElementFlags elementFlags,
 					   SubControl sub,
 					   const QStyleOption& opt,
@@ -1512,7 +1512,7 @@ QRect QSGIStyle::querySubControlMetrics( ComplexControl control,
 }
 
 /*! \reimp */
-int QSGIStyle::styleHint(StyleHint sh, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QStyleOption &opt, QStyleHintReturn *returnData, const QWidget *w) const
+int QSGIStyle::styleHint(StyleHint sh, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QStyleOption &opt, QStyleHintReturn *returnData, const QWidget *w) const
 {
 	int ret;
 
diff --git a/src/styles/qsgistyle.h b/src/styles/qsgistyle.h
index 17bdb05..2e91d3a 100644
--- a/src/styles/qsgistyle.h
+++ b/src/styles/qsgistyle.h
@@ -67,14 +67,14 @@ public:
 #if !defined(Q_NO_USING_KEYWORD)
     using QMotifStyle::polish;
 #endif
-    void polish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void * );
-    void unPolish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void * );
-    void applicationPolish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void * );
-    void applicationUnPolish( QStyleControlElementData ceData, ControlElementFlags elementFlags, void * );
+    void polish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void * );
+    void unPolish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void * );
+    void applicationPolish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void * );
+    void applicationUnPolish( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void * );
 
     void drawPrimitive( PrimitiveElement pe,
 			QPainter *p,
-			QStyleControlElementData ceData,
+			const QStyleControlElementData &ceData,
 			ControlElementFlags elementFlags,
 			const QRect &r,
 			const QColorGroup &cg,
@@ -83,7 +83,7 @@ public:
 
     void drawControl( ControlElement element,
 		      QPainter *p,
-		      QStyleControlElementData ceData,
+		      const QStyleControlElementData &ceData,
 		      ControlElementFlags elementFlags,
 		      const QRect &r,
 		      const QColorGroup &cg,
@@ -93,7 +93,7 @@ public:
 
     void drawComplexControl( ComplexControl control,
 			     QPainter *p,
-			     QStyleControlElementData ceData,
+			     const QStyleControlElementData &ceData,
 			     ControlElementFlags elementFlags,
 			     const QRect& r,
 			     const QColorGroup& cg,
@@ -107,26 +107,26 @@ public:
 			     const QStyleOption& = QStyleOption::Default,
 			     const QWidget* widget = 0 ) const;
 
-    int pixelMetric( PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 ) const;
+    int pixelMetric( PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget = 0 ) const;
 
     QSize sizeFromContents( ContentsType contents,
-			    QStyleControlElementData ceData,
+			    const QStyleControlElementData &ceData,
 			    ControlElementFlags elementFlags,
 			    const QSize &contentsSize,
 			    const QStyleOption& = QStyleOption::Default,
 			    const QWidget *widget = 0 ) const;
 
-    QRect subRect( SubRect r, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget ) const;
+    QRect subRect( SubRect r, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget ) const;
     QRect querySubControlMetrics( ComplexControl control,
-				  QStyleControlElementData ceData,
+				  const QStyleControlElementData &ceData,
 				  ControlElementFlags elementFlags,
 				  SubControl sc,
 				  const QStyleOption& = QStyleOption::Default,
 				  const QWidget *widget = 0 ) const;
 
-    int styleHint(StyleHint sh, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QStyleOption &, QStyleHintReturn *, const QWidget *) const;
+    int styleHint(StyleHint sh, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QStyleOption &, QStyleHintReturn *, const QWidget *) const;
 
-    bool objectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QEvent *e );
+    bool objectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QEvent *e );
 
 private:
     QSGIStylePrivate *d;
diff --git a/src/styles/qwindowsstyle.cpp b/src/styles/qwindowsstyle.cpp
index f93e31a..4920f61 100644
--- a/src/styles/qwindowsstyle.cpp
+++ b/src/styles/qwindowsstyle.cpp
@@ -95,7 +95,7 @@ class QWindowsStyle::Private : public QObject
 public:
     Private(QWindowsStyle *parent);
 
-    bool objectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QEvent *e );
+    bool objectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QEvent *e );
 
 private:
     int menuBarTimer;
@@ -107,7 +107,7 @@ QWindowsStyle::Private::Private(QWindowsStyle *parent)
 }
 
 // Records Alt- and Focus events
-bool QWindowsStyle::Private::objectEventHandler( QStyleControlElementData ceData, ControlElementFlags, void* source, QEvent *e )
+bool QWindowsStyle::Private::objectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags, void* source, QEvent *e )
 {
     if (!(ceData.widgetObjectTypes.contains("QWidget"))) {
 	return TRUE;
@@ -173,7 +173,7 @@ QWindowsStyle::~QWindowsStyle()
 }
 
 /*! \reimp */
-bool QWindowsStyle::objectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QEvent *e ) {
+bool QWindowsStyle::objectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QEvent *e ) {
     if (d) {
         return d->objectEventHandler(ceData, elementFlags, source, e);
     }
@@ -181,7 +181,7 @@ bool QWindowsStyle::objectEventHandler( QStyleControlElementData ceData, Control
 }
 
 /*! \reimp */
-void QWindowsStyle::applicationPolish(QStyleControlElementData ceData, ControlElementFlags elementFlags, void *ptr)
+void QWindowsStyle::applicationPolish(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *ptr)
 {
     // We only need the overhead when shortcuts are sometimes hidden
     if (styleHint(SH_UnderlineAccelerator, QStyleControlElementData(), CEF_None, 0) && styleHint(SH_HideUnderlineAcceleratorWhenAltUp, QStyleControlElementData(), CEF_None, 0)) {
@@ -191,20 +191,20 @@ void QWindowsStyle::applicationPolish(QStyleControlElementData ceData, ControlEl
 }
 
 /*! \reimp */
-void QWindowsStyle::applicationUnPolish(QStyleControlElementData, ControlElementFlags, void *)
+void QWindowsStyle::applicationUnPolish(const QStyleControlElementData&, ControlElementFlags, void *)
 {
     delete d;
     d = 0;
 }
 
 /*! \reimp */
-void QWindowsStyle::polish(QStyleControlElementData ceData, ControlElementFlags elementFlags, void *ptr)
+void QWindowsStyle::polish(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *ptr)
 {
     QCommonStyle::polish(ceData, elementFlags, ptr);
 }
 
 /*! \reimp */
-void QWindowsStyle::unPolish(QStyleControlElementData ceData, ControlElementFlags elementFlags, void *ptr)
+void QWindowsStyle::unPolish(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *ptr)
 {
     QCommonStyle::polish(ceData, elementFlags, ptr);
 }
@@ -218,7 +218,7 @@ void QWindowsStyle::polish( QPalette &pal )
 /*! \reimp */
 void QWindowsStyle::drawPrimitive( PrimitiveElement pe,
 				   QPainter *p,
-				   QStyleControlElementData ceData,
+				   const QStyleControlElementData &ceData,
 				   ControlElementFlags elementFlags,
 				   const QRect &r,
 				   const QColorGroup &cg,
@@ -688,7 +688,7 @@ void QWindowsStyle::drawPrimitive( PrimitiveElement pe,
 */
 void QWindowsStyle::drawControl( ControlElement element,
 				 QPainter *p,
-				 QStyleControlElementData ceData,
+				 const QStyleControlElementData &ceData,
 				 ControlElementFlags elementFlags,
 				 const QRect &r,
 				 const QColorGroup &cg,
@@ -1019,7 +1019,7 @@ void QWindowsStyle::drawControl( ControlElement element,
 /*!
   \reimp
 */
-int QWindowsStyle::pixelMetric(PixelMetric metric, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QWidget *widget) const
+int QWindowsStyle::pixelMetric(PixelMetric metric, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QWidget *widget) const
 {
     int ret;
 
@@ -1096,7 +1096,7 @@ int QWindowsStyle::pixelMetric(PixelMetric metric, QStyleControlElementData ceDa
   \reimp
 */
 QSize QWindowsStyle::sizeFromContents( ContentsType contents,
-				       QStyleControlElementData ceData,
+				       const QStyleControlElementData &ceData,
 				       ControlElementFlags elementFlags,
 				       const QSize &contentsSize,
 				       const QStyleOption& opt,
@@ -1196,7 +1196,7 @@ QSize QWindowsStyle::sizeFromContents( ContentsType contents,
 
 /*! \reimp
 */
-void QWindowsStyle::polishPopupMenu( QStyleControlElementData ceData, ControlElementFlags elementFlags, void *ptr )
+void QWindowsStyle::polishPopupMenu( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *ptr )
 {
 #ifndef QT_NO_POPUPMENU
     if ( !(ceData.windowState & WState_Polished ) ) {
@@ -1488,7 +1488,7 @@ static const char *const question_xpm[] = {
  \reimp
  */
 QPixmap QWindowsStyle::stylePixmap(StylePixmap stylepixmap,
-				   QStyleControlElementData ceData,
+				   const QStyleControlElementData &ceData,
 				   ControlElementFlags elementFlags,
 				   const QStyleOption& opt,
 				   const QWidget *widget) const
@@ -1527,7 +1527,7 @@ QPixmap QWindowsStyle::stylePixmap(StylePixmap stylepixmap,
 /*!\reimp
 */
 void QWindowsStyle::drawComplexControl( ComplexControl ctrl, QPainter *p,
-					QStyleControlElementData ceData,
+					const QStyleControlElementData &ceData,
 					ControlElementFlags elementFlags,
 					const QRect &r,
 					const QColorGroup &cg,
@@ -1975,7 +1975,7 @@ void QWindowsStyle::drawComplexControl( ComplexControl ctrl, QPainter *p,
 
 /*! \reimp */
 int QWindowsStyle::styleHint( StyleHint hint,
-			      QStyleControlElementData ceData,
+			      const QStyleControlElementData &ceData,
 			      ControlElementFlags elementFlags,
 			      const QStyleOption &opt,
 			      QStyleHintReturn *returnData,
@@ -2032,7 +2032,7 @@ int QWindowsStyle::styleHint( StyleHint hint,
 }
 
 /*! \reimp */
-QRect QWindowsStyle::subRect(SubRect r, const QStyleControlElementData ceData, const ControlElementFlags elementFlags, const QWidget *widget) const
+QRect QWindowsStyle::subRect(SubRect r, const QStyleControlElementData &ceData, const ControlElementFlags elementFlags, const QWidget *widget) const
 {
     QRect rect;
 
diff --git a/src/styles/qwindowsstyle.h b/src/styles/qwindowsstyle.h
index 4ffc849..2cb3283 100644
--- a/src/styles/qwindowsstyle.h
+++ b/src/styles/qwindowsstyle.h
@@ -61,20 +61,20 @@ public:
     QWindowsStyle();
     ~QWindowsStyle();
 
-    void applicationPolish(QStyleControlElementData ceData, ControlElementFlags elementFlags, void *);
-    void applicationUnPolish(QStyleControlElementData ceData, ControlElementFlags elementFlags, void *);
+    void applicationPolish(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *);
+    void applicationUnPolish(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *);
 
-    void polish(QStyleControlElementData ceData, ControlElementFlags elementFlags, void *);
-    void unPolish(QStyleControlElementData ceData, ControlElementFlags elementFlags, void *);
+    void polish(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *);
+    void unPolish(const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void *);
 
     void polish( QPalette & );
 
-    virtual void polishPopupMenu( QStyleControlElementData ceData, ControlElementFlags elementFlags, void * );
+    virtual void polishPopupMenu( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void * );
 
     // new stuff
     void drawPrimitive( PrimitiveElement pe,
 			QPainter *p,
-			QStyleControlElementData ceData,
+			const QStyleControlElementData &ceData,
 			ControlElementFlags elementFlags,
 			const QRect &r,
 			const QColorGroup &cg,
@@ -83,7 +83,7 @@ public:
 
     void drawControl( ControlElement element,
 		      QPainter *p,
-		      QStyleControlElementData ceData,
+		      const QStyleControlElementData &ceData,
 		      ControlElementFlags elementFlags,
 		      const QRect &r,
 		      const QColorGroup &cg,
@@ -93,7 +93,7 @@ public:
 
     void drawComplexControl( ComplexControl control,
 			     QPainter* p,
-			     QStyleControlElementData ceData,
+			     const QStyleControlElementData &ceData,
 			     ControlElementFlags elementFlags,
 			     const QRect& r,
 			     const QColorGroup& cg,
@@ -108,29 +108,29 @@ public:
 			     const QWidget* widget = 0 ) const;
 
     int pixelMetric( PixelMetric metric,
-		     QStyleControlElementData ceData,
+		     const QStyleControlElementData &ceData,
 		     ControlElementFlags elementFlags,
 		     const QWidget *widget = 0 ) const;
 
     QSize sizeFromContents( ContentsType contents,
-			    QStyleControlElementData ceData,
+			    const QStyleControlElementData &ceData,
 			    ControlElementFlags elementFlags,
 			    const QSize &contentsSize,
 			    const QStyleOption& = QStyleOption::Default,
 			    const QWidget *widget = 0 ) const;
 
-    int styleHint(StyleHint sh, QStyleControlElementData ceData, ControlElementFlags elementFlags, const QStyleOption & = QStyleOption::Default,
+    int styleHint(StyleHint sh, const QStyleControlElementData &ceData, ControlElementFlags elementFlags, const QStyleOption & = QStyleOption::Default,
 		  QStyleHintReturn* = 0, const QWidget* = 0) const;
 
     QPixmap stylePixmap( StylePixmap stylepixmap,
-			 QStyleControlElementData ceData,
+			 const QStyleControlElementData &ceData,
 			 ControlElementFlags elementFlags,
 			 const QStyleOption& = QStyleOption::Default,
 			 const QWidget *widget = 0 ) const;
 
-    QRect subRect( SubRect r, const QStyleControlElementData ceData, const ControlElementFlags elementFlags, const QWidget *widget ) const;
+    QRect subRect( SubRect r, const QStyleControlElementData &ceData, const ControlElementFlags elementFlags, const QWidget *widget ) const;
 
-    bool objectEventHandler( QStyleControlElementData ceData, ControlElementFlags elementFlags, void* source, QEvent *e );
+    bool objectEventHandler( const QStyleControlElementData &ceData, ControlElementFlags elementFlags, void* source, QEvent *e );
 
 private:
     class Private;