Add Perform() methods to all the layout-related classes that needed them.

headers/os/interface/AbstractLayout.h

@@ -39,6 +39,8 @@ public:
 	virtual status_t			Archive(BMessage* into, bool deep = true) const;
 	virtual	status_t			AllUnarchived(const BMessage* from);
 
+	virtual	status_t			Perform(perform_code d, void* arg);
+
 protected:
 	virtual	void				OwnerChanged(BView* was);
 	virtual	void				AncestorVisibilityChanged(bool shown);

headers/os/interface/AbstractLayoutItem.h

@@ -33,6 +33,8 @@ public:
 
 	virtual status_t			Archive(BMessage* into, bool deep = true) const;
 
+	virtual	status_t			Perform(perform_code d, void* arg);
+
 private:
 			BSize				fMinSize;
 			BSize				fMaxSize;

headers/os/interface/CardLayout.h

@@ -32,6 +32,8 @@ public:
 	virtual status_t			AllUnarchived(const BMessage* from);
 	static	BArchivable*		Instantiate(BMessage* from);
 
+	virtual	status_t			Perform(perform_code d, void* arg);
+
 protected:
 	virtual	void				LayoutInvalidated(bool children = false);
 	virtual	void				DoLayout();

headers/os/interface/GridLayout.h

@@ -66,6 +66,8 @@ public:
 	virtual status_t			ItemUnarchived(const BMessage* from,
 									BLayoutItem* item, int32 index);
 
+	virtual	status_t			Perform(perform_code d, void* arg);
+
 protected:
 	virtual	bool				ItemAdded(BLayoutItem* item, int32 atIndex);
 	virtual	void				ItemRemoved(BLayoutItem* item, int32 fromIndex);
@@ -81,7 +83,6 @@ protected:
 									ColumnRowConstraints* constraints);
 	virtual	void				GetItemDimensions(BLayoutItem* item,
 									Dimensions* dimensions);
-
 private:
 			class DummyLayoutItem;
 			class RowInfoArray;

headers/os/interface/GroupLayout.h

@@ -44,6 +44,8 @@ public:
 	virtual	status_t			ItemUnarchived(const BMessage* from,
 									BLayoutItem* item, int32 index);
 
+	virtual	status_t			Perform(perform_code d, void* arg);
+
 protected:	
 	virtual	bool				ItemAdded(BLayoutItem* item, int32 atIndex);
 	virtual	void				ItemRemoved(BLayoutItem* item, int32 fromIndex);

headers/os/interface/Layout.h

@@ -88,6 +88,8 @@ protected:
 	// To be called when layout data is known to be good
 			void				ResetLayoutInvalidation();
 
+	virtual status_t			Perform(perform_code d, void* arg);
+
 private:
 			friend class BView;
 

headers/os/interface/LayoutItem.h

@@ -58,6 +58,8 @@ public:
 	virtual status_t			AllArchived(BMessage* into) const;
 	virtual	status_t			AllUnarchived(const BMessage* from);
 
+	virtual status_t			Perform(perform_code d, void* arg);
+
 protected:
 			void				SetLayout(BLayout* layout);
 

headers/os/interface/SplitView.h

@@ -71,6 +71,8 @@ public:
 	virtual status_t			AllUnarchived(const BMessage* from);
 	static	BArchivable*		Instantiate(BMessage* from);
 
+	virtual	status_t			Perform(perform_code d, void* arg);
+
 protected:
 	virtual	void				DrawSplitter(BRect frame,
 									const BRect& updateRect,

headers/os/interface/TwoDimensionalLayout.h

@@ -42,6 +42,8 @@ public:
 	virtual status_t			AllArchived(BMessage* into) const;
 	virtual	status_t			AllUnarchived(const BMessage* from);
 
+	virtual status_t			Perform(perform_code d, void* arg);
+
 protected:
 			struct ColumnRowConstraints {
 				float	weight;