Get rid of NULLs in xfa/

xfa/fxfa/app/xfa_fffield.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 XFA_FXFA_APP_XFA_FFFIELD_H_
 #define XFA_FXFA_APP_XFA_FFFIELD_H_
 
 #include "xfa/fwl/core/ifwl_widgetdelegate.h"
 #include "xfa/fwl/lightwidget/cfwl_widget.h"
 #include "xfa/fxfa/include/xfa_ffpageview.h"
 #include "xfa/fxfa/include/xfa_ffwidget.h"
 
 #define XFA_MINUI_HEIGHT 4.32f
 #define XFA_DEFAULTUI_HEIGHT 2.0f
 
 class CXFA_FFField : public CXFA_FFWidget, public IFWL_WidgetDelegate {
  public:
   CXFA_FFField(CXFA_FFPageView* pPageView, CXFA_WidgetAcc* pDataAcc);
   virtual ~CXFA_FFField();
 
   virtual FX_BOOL GetBBox(CFX_RectF& rtBox,
                           uint32_t dwStatus,
                           FX_BOOL bDrawFocus = FALSE);
   virtual void RenderWidget(CFX_Graphics* pGS,
-                            CFX_Matrix* pMatrix = NULL,
+                            CFX_Matrix* pMatrix = nullptr,
                             uint32_t dwStatus = 0,
                             int32_t iRotate = 0);
   virtual FX_BOOL IsLoaded();
   virtual FX_BOOL LoadWidget();
   virtual void UnloadWidget();
   virtual FX_BOOL PerformLayout();
   virtual void UpdateFWL();
   uint32_t UpdateUIProperty();
   virtual FX_BOOL OnMouseEnter();
   virtual FX_BOOL OnMouseExit();
@@ skipping 17 matching lines @@
   virtual FWL_WidgetHit OnHitTest(FX_FLOAT fx, FX_FLOAT fy);
   virtual FX_BOOL OnSetCursor(FX_FLOAT fx, FX_FLOAT fy);
 
  protected:
   virtual FX_BOOL PtInActiveRect(FX_FLOAT fx, FX_FLOAT fy);
   virtual void SetFWLRect();
   void SetFWLThemeProvider();
   CFWL_Widget* GetNormalWidget() { return m_pNormalWidget; }
   void FWLToClient(FX_FLOAT& fx, FX_FLOAT& fy);
   void LayoutCaption();
-  void RenderCaption(CFX_Graphics* pGS, CFX_Matrix* pMatrix = NULL);
+  void RenderCaption(CFX_Graphics* pGS, CFX_Matrix* pMatrix = nullptr);
 
   int32_t CalculateOverride();
   int32_t CalculateWidgetAcc(CXFA_WidgetAcc* pAcc);
   FX_BOOL ProcessCommittedData();
   virtual FX_BOOL CommitData();
   virtual FX_BOOL IsDataChanged();
   void DrawHighlight(CFX_Graphics* pGS,
                      CFX_Matrix* pMatrix,
                      uint32_t dwStatus,
                      FX_BOOL bEllipse = FALSE);
   void DrawFocus(CFX_Graphics* pGS, CFX_Matrix* pMatrix);
   void TranslateFWLMessage(CFWL_Message* pMessage);
   void CapPlacement();
   void CapTopBottomPlacement(CXFA_Caption caption,
                              const CFX_RectF& rtWidget,
                              int32_t iCapPlacement);
   void CapLeftRightPlacement(CXFA_Caption caption,
                              const CFX_RectF& rtWidget,
                              int32_t iCapPlacement);
   void SetEditScrollOffset();
 
  public:
   virtual void OnProcessMessage(CFWL_Message* pMessage);
   virtual void OnProcessEvent(CFWL_Event* pEvent);
   virtual void OnDrawWidget(CFX_Graphics* pGraphics,
-                            const CFX_Matrix* pMatrix = NULL);
+                            const CFX_Matrix* pMatrix = nullptr);
 
  protected:
   CFWL_Widget* m_pNormalWidget;
   CFX_RectF m_rtUI;
   CFX_RectF m_rtCaption;
 };
 
 #endif  // XFA_FXFA_APP_XFA_FFFIELD_H_