Only create widgets if really needed.

fpdfsdk/include/fsdk_baseform.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 FPDFSDK_INCLUDE_FSDK_BASEFORM_H_
 #define FPDFSDK_INCLUDE_FSDK_BASEFORM_H_
 
 #include <map>
@@ skipping 245 matching lines @@
  public:
   explicit CPDFSDK_InterForm(CPDFSDK_Document* pDocument);
   ~CPDFSDK_InterForm() override;
 
   CPDF_InterForm* GetInterForm() const { return m_pInterForm.get(); }
   CPDFSDK_Document* GetDocument() const { return m_pDocument; }
 
   FX_BOOL HighlightWidgets();
 
   CPDFSDK_Widget* GetSibling(CPDFSDK_Widget* pWidget, FX_BOOL bNext) const;
-  CPDFSDK_Widget* GetWidget(CPDF_FormControl* pControl) const;
+  CPDFSDK_Widget* GetWidget(CPDF_FormControl* pControl,
+                            bool createIfNeeded) const;
   void GetWidgets(const CFX_WideString& sFieldName,
                   std::vector<CPDFSDK_Widget*>* widgets) const;
   void GetWidgets(CPDF_FormField* pField,
                   std::vector<CPDFSDK_Widget*>* widgets) const;
 
   void AddMap(CPDF_FormControl* pControl, CPDFSDK_Widget* pWidget);
   void RemoveMap(CPDF_FormControl* pControl);
 
   void EnableCalculate(FX_BOOL bEnabled);
   FX_BOOL IsCalculateEnabled() const;
@@ skipping 120 matching lines @@
                                      const CPDFSDK_Annot* p2);
 
   TabOrder m_eTabOrder;
   CPDFSDK_PageView* m_pPageView;
   CFX_ByteString m_sType;
   CFX_ByteString m_sSubType;
   std::vector<CPDFSDK_Annot*> m_Annots;
 };
 
 #endif  // FPDFSDK_INCLUDE_FSDK_BASEFORM_H_