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lightning-sunbird  0.9+nobinonly
nsNativeScrollbarFrame.h
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00037 
00038 //
00039 // nsNativeScrollbarFrame
00040 //
00041 // A class that wraps a nsIWidget that is a native scrollbar
00042 // and keeps the two in sync with the rest of gecko. Allows us to
00043 // shim a native scrollbar into the GFX scroll-view mechanism.
00044 // 
00045 
00046 #ifndef nsNativeScrollbarFrame_h__
00047 #define nsNativeScrollbarFrame_h__
00048 
00049 
00050 #include "nsScrollbarFrame.h"
00051 #include "nsIWidget.h"
00052 #include "nsIScrollbarMediator.h"
00053 
00054 class nsISupportsArray;
00055 class nsIPresShell;
00056 class nsPresContext;
00057 class nsIContent;
00058 class nsStyleContext;
00059 
00060 nsresult NS_NewNativeScrollbarFrame(nsIPresShell* aPresShell, nsIFrame** aResult) ;
00061 
00062 
00063 class nsNativeScrollbarFrame : public nsBoxFrame, public nsIScrollbarMediator
00064 {
00065 public:
00066   nsNativeScrollbarFrame(nsIPresShell* aShell);
00067 
00068 #ifdef DEBUG
00069   NS_IMETHOD GetFrameName(nsAString& aResult) const {
00070     return MakeFrameName(NS_LITERAL_STRING("NativeScrollbarFrame"), aResult);
00071   }
00072 #endif
00073 
00074   NS_IMETHOD Init(nsPresContext* aPresContext, nsIContent* aContent,
00075                     nsIFrame* aParent, nsStyleContext* aContext, nsIFrame* aPrevInFlow);
00076            
00077   // nsIFrame overrides
00078   NS_IMETHOD AttributeChanged(nsIContent* aChild, PRInt32 aNameSpaceID,
00079                               nsIAtom* aAttribute, PRInt32 aModType);
00080 
00081   NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);
00082   NS_IMETHOD_(nsrefcnt) AddRef() { return NS_OK; }
00083   NS_IMETHOD_(nsrefcnt) Release() { return NS_OK; }
00084 
00085   NS_IMETHOD Reflow(nsPresContext*          aPresContext,
00086                     nsHTMLReflowMetrics&     aDesiredSize,
00087                     const nsHTMLReflowState& aReflowState,
00088                     nsReflowStatus&          aStatus);
00089 
00090   NS_IMETHOD GetPrefSize(nsBoxLayoutState& aState, nsSize& aSize);
00091 
00092   NS_IMETHOD Destroy(nsPresContext* aPresContext);
00093  
00094   // nsIScrollbarMediator forwarding
00095   NS_IMETHOD PositionChanged(nsISupports* aScrollbar, PRInt32 aOldIndex, PRInt32& aNewIndex);
00096   NS_IMETHOD ScrollbarButtonPressed(nsISupports* aScrollbar, PRInt32 aOldIndex,
00097                                     PRInt32 aNewIndex);
00098   NS_IMETHOD VisibilityChanged(nsISupports* aScrollbar, PRBool aVisible);
00099 
00100 protected:
00101   
00102   void Hookup();
00103 
00104   struct Parts {
00105     nsIFrame*             mScrollbarFrame;
00106     nsIScrollbarFrame*    mIScrollbarFrame;
00107     nsIScrollbarMediator* mMediator;
00108      
00109     Parts(nsIFrame* aFrame, nsIScrollbarFrame* aIScrollbarFrame, nsIScrollbarMediator* aMediator) :
00110       mScrollbarFrame(aFrame), mIScrollbarFrame(aIScrollbarFrame), mMediator(aMediator) {}
00111   };
00112   Parts FindParts();
00113    
00114   PRBool IsVertical() const { return mIsVertical; }
00115                   
00116 private:
00117 
00118   PRPackedBool mIsVertical;
00119   PRPackedBool mScrollbarNeedsContent;
00120   nsCOMPtr<nsIWidget> mScrollbar;
00121   
00122 }; // class nsNativeScrollbarFrame
00123 
00124 #endif