Remove IFDE_TxtEdt interfaces where possible.

xfa/fee/fde_txtedtparag.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_FEE_FDE_TXTEDTPARAG_H_
 #define XFA_FEE_FDE_TXTEDTPARAG_H_
 
-#include "xfa/fee/ifde_txtedtengine.h"
+#include <stdint.h>
 
 class CFDE_TxtEdtEngine;
 
-class CFDE_TxtEdtParag : public IFDE_TxtEdtParag {
+class CFDE_TxtEdtParag {
  public:
   explicit CFDE_TxtEdtParag(CFDE_TxtEdtEngine* pEngine);
   ~CFDE_TxtEdtParag();
 
-  virtual int32_t GetTextLength() const { return m_nCharCount; }
-  virtual int32_t GetStartIndex() const { return m_nCharStart; }
-  virtual int32_t CountLines() const { return m_nLineCount; }
-  virtual void GetLineRange(int32_t nLineIndex,
-                            int32_t& nStart,
-                            int32_t& nCount) const;
+  int32_t GetTextLength() const { return m_nCharCount; }
+  int32_t GetStartIndex() const { return m_nCharStart; }
+  int32_t GetLineCount() const { return m_nLineCount; }
+
+  void SetTextLength(int32_t len) { m_nCharCount = len; }
+  void IncrementTextLength(int32_t len) { m_nCharCount += len; }
+  void SetStartIndex(int32_t idx) { m_nCharStart = idx; }
+  void IncrementStartIndex(int32_t val) { m_nCharStart += val; }
+  void DecrementStartIndex(int32_t val) { m_nCharStart -= val; }
+  void SetLineCount(int32_t count) { m_nLineCount = count; }
+
+  void GetLineRange(int32_t nLineIndex, int32_t& nStart, int32_t& nCount) const;
   void LoadParag();
   void UnloadParag();
   void CalcLines();
+
+ private:
   int32_t m_nCharStart;
   int32_t m_nCharCount;
   int32_t m_nLineCount;
-
- private:
   void* m_lpData;
   CFDE_TxtEdtEngine* m_pEngine;
 };
 
 #endif  // XFA_FEE_FDE_TXTEDTPARAG_H_