fpdfsdk/ differences with XFA (for didactic purposes only).

fpdfsdk/include/formfiller/FFL_FormFiller.h

Index: fpdfsdk/include/formfiller/FFL_FormFiller.h
diff --git a/fpdfsdk/include/formfiller/FFL_FormFiller.h b/fpdfsdk/include/formfiller/FFL_FormFiller.h
index eb82bda2f4cf22af4fd8d0ff61b827022237cb53..83b9902aa503749991081ddd4fe8391fbf7c7174 100644
--- a/fpdfsdk/include/formfiller/FFL_FormFiller.h
+++ b/fpdfsdk/include/formfiller/FFL_FormFiller.h
@@ -120,6 +120,10 @@ class CFFL_FormFiller : public IPWL_Provider, public CPWL_TimerHandler {
   virtual FX_BOOL IsDataChanged(CPDFSDK_PageView* pPageView);
   virtual void SaveData(CPDFSDK_PageView* pPageView);
 
+#ifdef PDF_ENABLE_XFA
+  virtual FX_BOOL IsFieldFull(CPDFSDK_PageView* pPageView);
+
+#endif
   CPWL_Wnd* GetPDFWindow(CPDFSDK_PageView* pPageView, FX_BOOL bNew);
   void DestroyPDFWindow(CPDFSDK_PageView* pPageView);
   void EscapeFiller(CPDFSDK_PageView* pPageView, FX_BOOL bDestroyPDFWindow);