Use new CNavCenterScroller and tell it to adjust the scroll bar when the column headers appear or disappear.

cmd/macfe/rdfui/CRDFCoordinator.cp

@@ -39,6 +39,7 @@
 #include "CRDFCoordinator.h"
 
 #include "CHyperTreeFlexTable.h"
+#include "CNavCenterScroller.h"
 #include "CNavCenterTitle.h"
 #include "UGraphicGizmos.h"
 
@@ -182,6 +183,10 @@ CRDFCoordinator :: ShowColumnHeaders ( )
 	mTreePane->MoveBy ( 0, columnHeaderFrame.height, false );
 	mTreePane->ResizeFrameBy ( 0, -columnHeaderFrame.height, false );
 
+	CNavCenterScroller* scroller = dynamic_cast<CNavCenterScroller*>(FindPaneByID(kScrollerPaneID));
+	if ( scroller )
+		scroller->ColumnHeadersChangedVisibility ( true, columnHeaderFrame.height );
+		
 } // ShowColumnHeaders
 
 
@@ -200,6 +205,10 @@ CRDFCoordinator :: HideColumnHeaders ( )
 	mTreePane->MoveBy ( 0, -columnHeaderFrame.height, false );
 	mTreePane->ResizeFrameBy ( 0, columnHeaderFrame.height, false );
 
+	CNavCenterScroller* scroller = dynamic_cast<CNavCenterScroller*>(FindPaneByID(kScrollerPaneID));
+	if ( scroller )
+		scroller->ColumnHeadersChangedVisibility ( false, columnHeaderFrame.height );
+
 } // HideColumnHeaders
 
 

cmd/macfe/rdfui/CRDFCoordinator.h

@@ -87,7 +87,8 @@ protected:
 public:
 	enum { class_ID = 'RCoo', pane_ID = 'RCoo' };
 	enum {
-		msg_ActiveSelectorChanged	= 'selc'		// broadcast when selector changes
+		msg_ActiveSelectorChanged = 'selc',		// broadcast when selector changes
+		kScrollerPaneID = 'HyTC'				// pane id of the scroller containing tree/headers/etc
 	};
 
 		// Set the current workspace to a particular kind of workspace