Fix IXFA_ destructor compiler warnings.

xfa/include/fxfa/fxfa.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef _FXFA
 #define _FXFA
 class IFDE_XMLElement;
 class CXFA_Node;
@@ skipping 130 matching lines @@
 #define XFA_IDS_String_Today                                    93
 #define XFA_IDS_ValidateLimit                                   94
 #define XFA_IDS_ValidateNullWarning                             95
 #define XFA_IDS_ValidateNullError                               96
 #define XFA_IDS_ValidateWarning                                 97
 #define XFA_IDS_ValidateError                                   98
 #define XFA_IDS_ValidateNumberError                             99
 class IXFA_AppProvider
 {
 public:
+    virtual ~IXFA_AppProvider() { }
 
     virtual void                SetAppType(FX_WSTR wsAppType) = 0;
     virtual void                GetAppType(CFX_WideString &wsAppType) = 0;
 
-    virtual void                SetFoxitAppType(FX_WSTR wsFoxitAppType)
-    {
-        return;
-    }
-    virtual void                GetFoxitAppType(CFX_WideString &wsFoxitAppType)
-    {
-        return;
-    }
+    virtual void                SetFoxitAppType(FX_WSTR wsFoxitAppType) { }
+    virtual void                GetFoxitAppType(CFX_WideString &wsFoxitAppType) { }
 
     virtual void                GetLanguage(CFX_WideString &wsLanguage) = 0;
-
     virtual void                GetPlatform(CFX_WideString &wsPlatform) = 0;
-
     virtual void                GetVariation(CFX_WideString &wsVariation) = 0;
 
     virtual void                GetVersion(CFX_WideString &wsVersion) = 0;
-
-    virtual void                GetFoxitVersion(CFX_WideString &wsFoxitVersion)
-    {
-        return;
-    }
+    virtual void                GetFoxitVersion(CFX_WideString &wsFoxitVersion) { }
 
     virtual void                GetAppName(CFX_WideString& wsName) = 0;
-
-    virtual void                GetFoxitAppName(CFX_WideString& wsFoxitName)
-    {
-        return;
-    }
+    virtual void                GetFoxitAppName(CFX_WideString& wsFoxitName) { }
 
     virtual void                Beep(FX_DWORD dwType) = 0;
 
     virtual FX_INT32    MsgBox(FX_WSTR wsMessage, FX_WSTR wsTitle = FX_WSTRC(L""), FX_DWORD dwIconType = 0, FX_DWORD dwButtonType = 0) = 0;
     virtual void                Response(CFX_WideString &wsAnswer, FX_WSTR wsQuestion, FX_WSTR wsTitle = FX_WSTRC(L""), FX_WSTR wsDefaultAnswer = FX_WSTRC(L""), FX_BOOL bMark = TRUE) = 0;
     virtual FX_INT32    GetDocumentCountInBatch() = 0;
     virtual FX_INT32    GetCurDocumentInBatch() = 0;
     virtual IFX_FileRead* DownloadURL(FX_WSTR wsURL) = 0;
 
     virtual FX_BOOL             PostRequestURL(FX_WSTR wsURL, FX_WSTR wsData, FX_WSTR wsContentType,
                                        FX_WSTR wsEncode, FX_WSTR wsHeader, CFX_WideString &wsResponse) = 0;
 
     virtual FX_BOOL             PutRequestURL(FX_WSTR wsURL, FX_WSTR wsData, FX_WSTR wsEncode) = 0;
     virtual void                LoadString(FX_INT32 iStringID, CFX_WideString &wsString) = 0;
     virtual     FX_BOOL         ShowFileDialog(FX_WSTR wsTitle, FX_WSTR wsFilter, CFX_WideStringArray &wsPathArr, FX_BOOL bOpen = TRUE) = 0;
-    virtual IFWL_AdapterTimerMgr* GetTimerMgr() = 0;;
+    virtual IFWL_AdapterTimerMgr* GetTimerMgr() = 0;
 };
 class IXFA_FontMgr
 {
 public:
     virtual void                Release() = 0;
     virtual IFX_Font*   GetFont(XFA_HDOC hDoc, FX_WSTR wsFontFamily, FX_DWORD dwFontStyles, FX_WORD wCodePage = 0xFFFF) = 0;
     virtual IFX_Font*   GetDefaultFont(XFA_HDOC hDoc, FX_WSTR wsFontFamily, FX_DWORD dwFontStyles, FX_WORD wCodePage = 0xFFFF) = 0;
+protected:
+    ~IXFA_FontMgr() { }
 };
 IXFA_FontMgr*   XFA_GetDefaultFontMgr();
 class IXFA_App
 {
 public:
     static IXFA_App*    Create(IXFA_AppProvider* pProvider);
     virtual void                Release() = 0;
     virtual IXFA_DocHandler*    GetDocHandler() = 0;
     virtual XFA_HDOC                    CreateDoc(IXFA_DocProvider* pProvider, IFX_FileRead* pStream, FX_BOOL bTakeOverFile = TRUE) = 0;
     virtual XFA_HDOC                    CreateDoc(IXFA_DocProvider* pProvider, CPDF_Document* pPDFDoc) = 0;
     virtual     IXFA_AppProvider*       GetAppProvider() = 0;
     virtual void                                SetDefaultFontMgr(IXFA_FontMgr* pFontMgr) = 0;
     virtual IXFA_MenuHandler*   GetMenuHandler() = 0;
+protected:
+    ~IXFA_App() { }
 };
 class IXFA_MenuHandler
 {
 public:
+    virtual ~IXFA_MenuHandler() { }
+
     virtual FX_BOOL             CanCopy(XFA_HWIDGET hWidget) = 0;
     virtual FX_BOOL             CanCut(XFA_HWIDGET hWidget) = 0;
     virtual FX_BOOL             CanPaste(XFA_HWIDGET hWidget) = 0;
     virtual FX_BOOL             CanSelectAll(XFA_HWIDGET hWidget) = 0;
     virtual FX_BOOL             CanDelete(XFA_HWIDGET hWidget) = 0;
     virtual FX_BOOL             CanDeSelect(XFA_HWIDGET hWidget) = 0;
     virtual FX_BOOL             Copy(XFA_HWIDGET hWidget, CFX_WideString &wsText) = 0;
     virtual FX_BOOL             Cut(XFA_HWIDGET hWidget, CFX_WideString &wsText) = 0;
     virtual FX_BOOL             Paste(XFA_HWIDGET hWidget, const CFX_WideString &wsText) = 0;
     virtual FX_BOOL             SelectAll(XFA_HWIDGET hWidget) = 0;
@@ skipping 18 matching lines @@
 #define  XFA_PAGEVIEWEVENT_PostRemoved          3
 #define  XFA_WIDGETEVENT_PostAdded                      2
 #define  XFA_WIDGETEVENT_PreRemoved                     3
 #define  XFA_WIDGETEVENT_PostContentChanged     6
 #define  XFA_WIDGETEVENT_ListItemRemoved        7
 #define  XFA_WIDGETEVENT_ListItemAdded          8
 #define  XFA_WIDGETEVENT_AccessChanged          9
 class IXFA_DocProvider
 {
 public:
+    virtual ~IXFA_DocProvider() { }
+
     virtual void                SetChangeMark(XFA_HDOC hDoc) = 0;
     virtual void                InvalidateRect(IXFA_PageView* pPageView, const CFX_RectF& rt, FX_DWORD dwFlags = 0) = 0;
     virtual void                DisplayCaret(XFA_HWIDGET hWidget, FX_BOOL bVisible, const CFX_RectF* pRtAnchor) = 0;
     virtual FX_BOOL             GetPopupPos(XFA_HWIDGET hWidget, FX_FLOAT fMinPopup, FX_FLOAT fMaxPopup,
                                     const CFX_RectF &rtAnchor, CFX_RectF &rtPopup) = 0;
     virtual FX_BOOL             PopupMenu(XFA_HWIDGET hWidget, CFX_PointF ptPopup, const CFX_RectF* pRectExclude = NULL) = 0;
     virtual void                PageViewEvent(IXFA_PageView* pPageView, FX_DWORD dwFlags) = 0;
     virtual void                WidgetEvent(XFA_HWIDGET hWidget, CXFA_WidgetAcc* pWidgetData, FX_DWORD dwEvent, FX_LPVOID pParam = NULL, FX_LPVOID pAdditional = NULL) = 0;
     virtual FX_BOOL             RenderCustomWidget(XFA_HWIDGET hWidget, CFX_Graphics* pGS, CFX_Matrix* pMatrix, const CFX_RectF& rtUI)
     {
@@ skipping 53 matching lines @@
 #define XFA_DOCTYPE_Static              1
 #define XFA_DOCTYPE_XDP                 2
 #define XFA_PARSESTATUS_StatusErr       -3
 #define XFA_PARSESTATUS_StreamErr       -2
 #define XFA_PARSESTATUS_SyntaxErr       -1
 #define XFA_PARSESTATUS_Ready           0
 #define XFA_PARSESTATUS_Done            100
 class IXFA_DocHandler
 {
 public:
+    virtual ~IXFA_DocHandler() { }
+
     virtual void                                ReleaseDoc(XFA_HDOC hDoc) = 0;
     virtual IXFA_DocProvider*   GetDocProvider(XFA_HDOC hDoc) = 0;
 
     virtual FX_DWORD                    GetDocType(XFA_HDOC hDoc) = 0;
     virtual     FX_INT32                        StartLoad(XFA_HDOC hDoc) = 0;
     virtual FX_INT32                    DoLoad(XFA_HDOC hDoc, IFX_Pause *pPause = NULL) = 0;
     virtual void                                StopLoad(XFA_HDOC hDoc) = 0;
 
     virtual IXFA_DocView*               CreateDocView(XFA_HDOC hDoc, FX_DWORD dwView = 0) = 0;
 
@@ skipping 101 matching lines @@
 #define XFA_EVENTERROR_Sucess           1
 #define XFA_EVENTERROR_Error            -1
 #define XFA_EVENTERROR_NotExist         0
 #define XFA_EVENTERROR_Disabled         2
 enum XFA_WIDGETORDER {
     XFA_WIDGETORDER_PreOrder,
 };
 class IXFA_DocView
 {
 public:
+    virtual ~IXFA_DocView() { }
+
     virtual XFA_HDOC                    GetDoc() = 0;
     virtual     FX_INT32                        StartLayout(FX_INT32 iStartPage = 0) = 0;
     virtual FX_INT32                    DoLayout(IFX_Pause *pPause = NULL) = 0;
     virtual void                                StopLayout() = 0;
 
     virtual FX_INT32                    GetLayoutStatus() = 0;
     virtual     void                            UpdateDocView() = 0;
     virtual FX_INT32                    CountPageViews() = 0;
     virtual IXFA_PageView*              GetPageView(FX_INT32 nIndex) = 0;
     virtual XFA_HWIDGET                 GetWidgetByName(FX_WSTR wsName) = 0;
@@ skipping 10 matching lines @@
 #define XFA_TRAVERSEWAY_Tranvalse               0x0001
 #define XFA_TRAVERSEWAY_Form                    0x0002
 #define XFA_WIDGETFILTER_Visible                0x0001
 #define XFA_WIDGETFILTER_Viewable               0x0010
 #define XFA_WIDGETFILTER_Printable              0x0020
 #define XFA_WIDGETFILTER_Field                  0x0100
 #define XFA_WIDGETFILTER_AllType                0x0F00
 class IXFA_PageView
 {
 public:
+    virtual ~IXFA_PageView() { }
+
     virtual IXFA_DocView*       GetDocView() = 0;
     virtual FX_INT32            GetPageViewIndex() = 0;
     virtual void                        GetPageViewRect(CFX_RectF &rtPage) = 0;
 
     virtual void                        GetDisplayMatrix(CFX_Matrix &mt, const CFX_Rect &rtDisp, FX_INT32 iRotate) = 0;
 
     virtual FX_INT32            LoadPageView(IFX_Pause *pPause = NULL) = 0;
     virtual void                        UnloadPageView() = 0;
     virtual XFA_HWIDGET         GetWidgetByPos(FX_FLOAT fx, FX_FLOAT fy) = 0;
     virtual IXFA_WidgetIterator* CreateWidgetIterator(FX_DWORD dwTraverseWay = XFA_TRAVERSEWAY_Form, FX_DWORD dwWidgetFilter = XFA_WIDGETFILTER_Visible | XFA_WIDGETFILTER_Viewable | XFA_WIDGETFILTER_AllType) = 0;
@@ skipping 13 matching lines @@
 #define XFA_RENDERSTATUS_ToBeContinued  2
 #define XFA_RENDERSTATUS_Done                   3
 #define XFA_RENDERSTATUS_Failed                 -1
 class IXFA_RenderContext
 {
 public:
     virtual void                Release() = 0;
     virtual FX_INT32    StartRender(IXFA_PageView* pPageView, CFX_Graphics* pGS, const CFX_Matrix& pMatrix, const CXFA_RenderOptions& options) = 0;
     virtual FX_INT32    DoRender(IFX_Pause* pPause = NULL) = 0;
     virtual     void            StopRender() = 0;
+protected:
+    ~IXFA_RenderContext() { }
 };
 IXFA_RenderContext*     XFA_RenderContext_Create();
 enum XFA_WIDGETTYPE {
     XFA_WIDGETTYPE_Barcode,
     XFA_WIDGETTYPE_PushButton,
     XFA_WIDGETTYPE_CheckButton,
     XFA_WIDGETTYPE_RadioButton,
     XFA_WIDGETTYPE_DatetimeEdit,
     XFA_WIDGETTYPE_DecimalField,
     XFA_WIDGETTYPE_NumericField,
@@ skipping 14 matching lines @@
 };
 #define XFA_WIDGETSTATUS_Visible        0x00000001
 #define XFA_WIDGETSTATUS_Invisible      0x00000002
 #define XFA_WIDGETSTATUS_Hidden         0x00000004
 #define XFA_WIDGETSTATUS_Viewable       0x00000010
 #define XFA_WIDGETSTATUS_Printable      0x00000020
 #define XFA_WIDGETSTATUS_Focused        0x00000100
 class IXFA_WidgetHandler
 {
 public:
+    virtual ~IXFA_WidgetHandler() { }
 
     virtual XFA_HWIDGET         CreateWidget(XFA_HWIDGET hParent, XFA_WIDGETTYPE eType, XFA_HWIDGET hBefore = NULL) = 0;
     virtual IXFA_PageView*      GetPageView(XFA_HWIDGET hWidget) = 0;
     virtual void                        GetRect(XFA_HWIDGET hWidget, CFX_RectF &rt) = 0;
     virtual FX_DWORD            GetStatus(XFA_HWIDGET hWidget) = 0;
     virtual FX_BOOL                     GetBBox(XFA_HWIDGET hWidget, CFX_RectF &rtBox, FX_DWORD dwStatus, FX_BOOL bDrawFocus = FALSE) = 0;
     virtual CXFA_WidgetAcc*     GetDataAcc(XFA_HWIDGET hWidget) = 0;
 
     virtual void                        GetName(XFA_HWIDGET hWidget, CFX_WideString &wsName, FX_INT32 iNameType = 0) = 0;
     virtual     FX_BOOL                 GetToolTip(XFA_HWIDGET hWidget, CFX_WideString &wsToolTip) = 0;
@@ skipping 24 matching lines @@
 {
 public:
     virtual void                                Release() = 0;
     virtual void                                Reset() = 0;
     virtual XFA_HWIDGET                 MoveToFirst() = 0;
     virtual XFA_HWIDGET                 MoveToLast() = 0;
     virtual     XFA_HWIDGET                     MoveToNext() = 0;
     virtual XFA_HWIDGET                 MoveToPrevious() = 0;
     virtual     XFA_HWIDGET                     GetCurrentWidget() = 0;
     virtual     FX_BOOL                         SetCurrentWidget(XFA_HWIDGET hWidget)  = 0;
+protected:
+    ~IXFA_WidgetIterator() { }
 };
 class IXFA_WidgetAccIterator
 {
 public:
     virtual void                                Release() = 0;
-
     virtual void                                Reset() = 0;
     virtual CXFA_WidgetAcc*             MoveToFirst() = 0;
     virtual CXFA_WidgetAcc*             MoveToLast() = 0;
     virtual CXFA_WidgetAcc*             MoveToNext() = 0;
     virtual CXFA_WidgetAcc*             MoveToPrevious() = 0;
     virtual CXFA_WidgetAcc*             GetCurrentWidgetAcc() = 0;
     virtual FX_BOOL                             SetCurrentWidgetAcc(CXFA_WidgetAcc* hWidget) = 0;
     virtual void                                SkipTree() = 0;
+protected:
+    ~IXFA_WidgetAccIterator() { }
 };
 IXFA_WidgetAccIterator* XFA_WidgetAccIterator_Create(CXFA_WidgetAcc* pTravelRoot, XFA_WIDGETORDER eOrder = XFA_WIDGETORDER_PreOrder);
 class IXFA_ChecksumContext
 {
 public:
     virtual void                                Release() = 0;
 
     virtual FX_BOOL                             StartChecksum() = 0;
     virtual FX_BOOL                             UpdateChecksum(IFX_FileRead* pSrcFile, FX_FILESIZE offset = 0, size_t size = 0) = 0;
     virtual void                                FinishChecksum() = 0;
     virtual void                                GetChecksum(CFX_ByteString &bsChecksum) = 0;
+protected:
+    ~IXFA_ChecksumContext() { }
 };
 IXFA_ChecksumContext*   XFA_Checksum_Create();
 #endif