src/kits/interface/textview_support/TextGapBuffer.h

   1 /*
   2  * Copyright 2001-2006, Haiku, Inc. All Rights Reserved.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Authors:
   6  *              Marc Flerackers (mflerackers@androme.be)
   7  */
   8 #ifndef __TEXTGAPBUFFER_H
   9 #define __TEXTGAPBUFFER_H
  10
  11
  12 #include <SupportDefs.h>
  13 #include <TextView.h>
  14
  15
  16 class BFile;
  17
  18
  19 namespace BPrivate {
  20
  21
  22 class TextGapBuffer {
  23 public:
  24                                                                 TextGapBuffer();
  25                                                                 ~TextGapBuffer();
  26
  27                         void                            InsertText(const char* inText, int32 inNumItems,
  28                                                                         int32 inAtIndex);
  29                         bool                            InsertText(BFile* file, int32 fileOffset,
  30                                                                         int32 amount, int32 atIndex);
  31                         void                            RemoveRange(int32 start, int32 end);
  32
  33                         bool                            FindChar(char inChar, int32 fromIndex,
  34                                                                         int32* ioDelta);
  35
  36                         const char*                     Text();
  37                         const char*                     RealText();
  38                         int32                           Length() const;
  39
  40                         const char*                     GetString(int32 fromOffset, int32* numBytes);
  41                         void                            GetString(int32 offset, int32 length,
  42                                                                         char* buffer);
  43
  44                         char                            RealCharAt(int32 offset) const;
  45
  46                         bool                            PasswordMode() const;
  47                         void                            SetPasswordMode(bool);
  48
  49 private:
  50                         void                            _MoveGapTo(int32 toIndex);
  51                         void                            _EnlargeGapTo(int32 inCount);
  52                         void                            _ShrinkGapTo(int32 inCount);
  53
  54                         int32                           fItemCount;                     // logical count
  55                         char*                           fBuffer;                        // allocated memory
  56                         int32                           fBufferCount;           // physical count
  57                         int32                           fGapIndex;                      // gap position
  58                         int32                           fGapCount;                      // gap count
  59                         char*                           fScratchBuffer;         // for GetString
  60                         int32                           fScratchSize;           // scratch size
  61                         bool                            fPasswordMode;
  62 };
  63
  64
  65 inline int32
  66 TextGapBuffer::Length() const
  67 {
  68         return fItemCount;
  69 }
  70
  71
  72 inline char
  73 TextGapBuffer::RealCharAt(int32 index) const
  74 {
  75         if (index < 0 || index >= fItemCount) {
  76                 if (index != fItemCount)
  77                         debugger("RealCharAt: invalid index supplied");
  78                 return 0;
  79         }
  80
  81         return index < fGapIndex ? fBuffer[index] : fBuffer[index + fGapCount];
  82 }
  83
  84
  85 } // namespace BPrivate
  86
  87
  88 #endif //__TEXTGAPBUFFER_H