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nsDragService.h
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00037 
00038 
00039 //
00040 // Mike Pinkerton
00041 // Netscape Communications
00042 //
00043 // The MacOS native implementation of nsIDragService, nsIDragSession, and
00044 // nsIDragSessionMac.
00045 //
00046 
00047 
00048 #ifndef nsDragService_h__
00049 #define nsDragService_h__
00050 
00051 
00052 #include "nsBaseDragService.h"
00053 #include "nsIDragSessionMac.h"
00054 #include <Drag.h>
00055 #include <MacWindows.h>
00056 
00057 class nsILocalFile;
00058 
00059 class nsDragService : public nsBaseDragService, public nsIDragSessionMac
00060 {
00061 public:
00062   nsDragService();
00063   virtual ~nsDragService();
00064 
00065   //nsISupports - can't use inherited because of nsIDragSessionMac
00066   NS_DECL_ISUPPORTS_INHERITED
00067   
00068   //nsIDragService
00069   NS_IMETHOD InvokeDragSession (nsIDOMNode *aDOMNode, nsISupportsArray * anArrayTransferables, nsIScriptableRegion * aRegion, PRUint32 aActionType);
00070 
00071   //nsIDragSession
00072   NS_IMETHOD GetData (nsITransferable * aTransferable, PRUint32 aItemIndex);
00073   NS_IMETHOD IsDataFlavorSupported(const char *aDataFlavor, PRBool *_retval);
00074   NS_IMETHOD GetNumDropItems (PRUint32 * aNumItems);
00075   NS_IMETHOD SetDragAction ( PRUint32 anAction ) ;
00076 
00077   //nsIDragSessionMac
00078   NS_IMETHOD SetDragReference ( DragReference aDragRef ) ;  
00079 
00080 private:
00081 
00082   char* LookupMimeMappingsForItem ( DragReference inDragRef, ItemReference itemRef ) ;
00083 
00084   void RegisterDragItemsAndFlavors ( nsISupportsArray * inArray, RgnHandle inDragRgn ) ;
00085   PRBool BuildDragRegion ( nsIScriptableRegion* inRegion, nsIDOMNode* inNode, RgnHandle ioDragRgn ) ;
00086   OSErr GetDataForFlavor ( nsISupportsArray* inDragItems, DragReference inDragRef, unsigned int inItemIndex, 
00087                              FlavorType inFlavor, void** outData, unsigned int * outSize ) ;
00088   nsresult ExtractDataFromOS ( DragReference inDragRef, ItemReference inItemRef, ResType inFlavor, 
00089                                  void** outBuffer, PRUint32* outBuffSize ) ;
00090 
00091     // compute a screen rect from the frame associated with the given dom node
00092   PRBool ComputeGlobalRectFromFrame ( nsIDOMNode* aDOMNode, Rect & outScreenRect ) ;
00093 
00094   OSErr GetHFSPromiseDropDirectory(DragReference inDragRef, unsigned int inItemIndex,
00095                                   FlavorType inFlavor, nsILocalFile** outDir);
00096 
00097   OSErr SetDropFileInDrag(DragReference inDragRef, unsigned int inItemIndex,
00098                                   FlavorType inFlavor, nsILocalFile* inFile);
00099 
00100     // callback for the MacOS DragManager when a drop site asks for data
00101   static pascal OSErr DragSendDataProc ( FlavorType inFlavor, void* inRefCon,
00102                                                                        ItemReference theItemRef, DragReference inDragRef ) ;
00103 
00104   DragSendDataUPP mDragSendDataUPP;
00105   DragReference mDragRef;        // reference to _the_ drag. There can be only one.
00106   nsISupportsArray* mDataItems;  // cached here for when we start the drag so the 
00107                                  // DragSendDataProc has access to them. 
00108                                  // ONLY VALID DURING A DRAG STARTED WITHIN THIS APP.
00109   PRBool mImageDraggingSupported;
00110 
00111 }; // class nsDragService
00112 
00113 
00114 #endif // nsDragService_h__
00115