Hooking up the scrollbar so that I can listen to events.

layout/xul/base/src/nsSliderFrame.cpp

@@ -553,8 +553,6 @@ nsSliderFrame::SetCurrentPosition(nsIPresContext& aPresContext, nsIContent* scro
   // set the new position
   scrollbar->SetAttribute(kNameSpaceID_None, nsXULAtoms::curpos, nsString(ch), PR_TRUE);
 
-  CurrentPositionChanged(&aPresContext);
-
   printf("Current Pos=%d\n",newpos);
   
 }

layout/xul/base/src/nsTitledButtonFrame.h

@@ -38,12 +38,7 @@ public:
   NS_IMETHOD GetBoxInfo(nsIPresContext& aPresContext, const nsHTMLReflowState& aReflowState, nsBoxInfo& aSize);
   NS_IMETHOD Dirty(const nsHTMLReflowState& aReflowState, nsIFrame*& incrementalChild);
 
-  NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr); 
-
-  NS_IMETHOD_(nsrefcnt) AddRef(void);
-  NS_IMETHOD_(nsrefcnt) Release(void);
-
-
+  NS_DECL_ISUPPORTS
 
   NS_IMETHOD  Init(nsIPresContext&  aPresContext,
                    nsIContent*      aContent,

layout/xul/base/src/nsTreeRowGroupFrame.cpp

@@ -31,6 +31,8 @@
 #include "nsCellMap.h"
 #include "nsIReflowCommand.h"
 #include "nsHTMLParts.h"
+#include "nsScrollbarButtonFrame.h"
+#include "nsSliderFrame.h"
 
 //
 // NS_NewTreeFrame
@@ -65,6 +67,52 @@ nsTreeRowGroupFrame::~nsTreeRowGroupFrame()
 {
 }
 
+NS_IMPL_ADDREF(nsTreeRowGroupFrame)
+NS_IMPL_RELEASE(nsTreeRowGroupFrame)
+  
+NS_IMETHODIMP
+nsTreeRowGroupFrame::QueryInterface(REFNSIID aIID, void** aInstancePtr) 
+{
+  if (NULL == aInstancePtr) {                                            
+    return NS_ERROR_NULL_POINTER;                                        
+  }                                                                      
+                                                                         
+  *aInstancePtr = NULL;                                                  
+                                                                                        
+  if (aIID.Equals(nsIScrollbarListener::GetIID())) {                                         
+    *aInstancePtr = (void*)(nsIScrollbarListener*) this;                                        
+    NS_ADDREF_THIS();                                                    
+    return NS_OK;                                                        
+  }   
+
+  return nsTableRowGroupFrame::QueryInterface(aIID, aInstancePtr);   
+}
+
+NS_IMETHODIMP
+nsTreeRowGroupFrame::PositionChanged(PRInt32 aOldIndex, PRInt32 aNewIndex)
+{
+  printf("The position changed!\n");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsTreeRowGroupFrame::PagedUpDown()
+{
+  printf("Hey! You paged up and down!\n");
+  return NS_OK;
+}
+
+void
+nsTreeRowGroupFrame::SetScrollbarFrame(nsIFrame* aFrame)
+{
+  mIsLazy = PR_TRUE;
+  mScrollbar = aFrame;
+  nsCOMPtr<nsIAtom> scrollbarAtom = dont_AddRef(NS_NewAtom("slider"));
+  nsIFrame* sliderFrame;
+  nsScrollbarButtonFrame::GetChildWithTag(scrollbarAtom, aFrame, sliderFrame);
+  ((nsSliderFrame*)sliderFrame)->SetScrollbarListener(this);
+}
+
 PRBool nsTreeRowGroupFrame::RowGroupDesiresExcessSpace() 
 {
   nsIFrame* parentFrame;

layout/xul/base/src/nsTreeRowGroupFrame.h

@@ -19,18 +19,19 @@
 
 #include "nsTableRowGroupFrame.h"
 #include "nsVoidArray.h"
+#include "nsIScrollbarListener.h"
 
 class nsTreeFrame;
 class nsCSSFrameConstructor;
 
-class nsTreeRowGroupFrame : public nsTableRowGroupFrame
+class nsTreeRowGroupFrame : public nsTableRowGroupFrame, public nsIScrollbarListener
 {
 public:
   friend nsresult NS_NewTreeRowGroupFrame(nsIFrame** aNewFrame);
 
   virtual PRBool ExcludeFrameFromReflow(nsIFrame* aFrame);
 
-  void SetScrollbarFrame(nsIFrame* aFrame) { mIsLazy = PR_TRUE; mScrollbar = aFrame; };
+  void SetScrollbarFrame(nsIFrame* aFrame);
   void SetFrameConstructor(nsCSSFrameConstructor* aFrameConstructor) { mFrameConstructor = aFrameConstructor; };
 
   void MakeLazy() { mIsLazy = PR_TRUE; };
@@ -60,6 +61,11 @@ public:
   virtual PRBool RowsDesireExcessSpace() { return PR_FALSE; };
   virtual PRBool RowGroupDesiresExcessSpace();
 
+  NS_DECL_ISUPPORTS
+
+  NS_IMETHOD PositionChanged(PRInt32 aOldIndex, PRInt32 aNewIndex);
+  NS_IMETHOD PagedUpDown();
+
 protected:
   nsTreeRowGroupFrame();
   virtual ~nsTreeRowGroupFrame();