1 //------------------------------------------------------------------------------ 2 // Copyright (c) 2001-2003, OpenBeOS 3 // 4 // Permission is hereby granted, free of charge, to any person obtaining a 5 // copy of this software and associated documentation files (the "Software"), 6 // to deal in the Software without restriction, including without limitation 7 // the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 // and/or sell copies of the Software, and to permit persons to whom the 9 // Software is furnished to do so, subject to the following conditions: 10 // 11 // The above copyright notice and this permission notice shall be included in 12 // all copies or substantial portions of the Software. 13 // 14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 19 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 20 // DEALINGS IN THE SOFTWARE. 21 // 22 // File Name: TextViewSupportBuffer.h 23 // Author: Marc Flerackers (mflerackers@androme.be) 24 // Description: Template class used to implement the various BTextView 25 // buffer classes. 26 //------------------------------------------------------------------------------ 27 28 #ifndef __TEXT_VIEW_SUPPORT_BUFFER__H__ 29 #define __TEXT_VIEW_SUPPORT_BUFFER__H__ 30 31 // Standard Includes ----------------------------------------------------------- 32 #include <cstdlib> 33 #include <cstring> 34 35 // System Includes ------------------------------------------------------------- 36 #include <SupportDefs.h> 37 38 // Project Includes ------------------------------------------------------------ 39 40 // Local Includes -------------------------------------------------------------- 41 42 // Local Defines --------------------------------------------------------------- 43 44 // Globals --------------------------------------------------------------------- 45 46 // _BTextViewSupportBuffer_ class ---------------------------------------------- 47 template <class T> 48 class _BTextViewSupportBuffer_ { 49 50 public: 51 _BTextViewSupportBuffer_(int32 inExtraCount = 0, int32 inCount = 0); 52 virtual ~_BTextViewSupportBuffer_(); 53 54 void InsertItemsAt(int32 inNumItems, int32 inAtIndex, const T *inItem); 55 void RemoveItemsAt(int32 inNumItems, int32 inAtIndex); 56 57 int32 ItemCount() const; 58 59 protected: 60 int32 fExtraCount; 61 int32 fItemCount; 62 int32 fBufferCount; 63 T* fBuffer; 64 }; 65 //------------------------------------------------------------------------------ 66 template <class T> 67 _BTextViewSupportBuffer_<T>::_BTextViewSupportBuffer_(int32 inExtraCount, 68 int32 inCount) 69 : fExtraCount(inExtraCount), 70 fItemCount(inCount), 71 fBufferCount(fExtraCount + fItemCount), 72 fBuffer(NULL) 73 { 74 fBuffer = (T *)calloc(fExtraCount + fItemCount, sizeof(T)); 75 } 76 //------------------------------------------------------------------------------ 77 template <class T> 78 _BTextViewSupportBuffer_<T>::~_BTextViewSupportBuffer_() 79 { 80 free(fBuffer); 81 } 82 //------------------------------------------------------------------------------ 83 template <class T> 84 void _BTextViewSupportBuffer_<T>::InsertItemsAt(int32 inNumItems, 85 int32 inAtIndex, 86 const T *inItem) 87 { 88 if (inNumItems < 1) 89 return; 90 91 inAtIndex = (inAtIndex > fItemCount) ? fItemCount : inAtIndex; 92 inAtIndex = (inAtIndex < 0) ? 0 : inAtIndex; 93 94 int32 delta = inNumItems * sizeof(T); 95 int32 logSize = fItemCount * sizeof(T); 96 if ((logSize + delta) >= fBufferCount) { 97 fBufferCount = logSize + delta + (fExtraCount * sizeof(T)); 98 fBuffer = (T *)realloc(fBuffer, fBufferCount); 99 } 100 101 T *loc = fBuffer + inAtIndex; 102 memmove(loc + inNumItems, loc, (fItemCount - inAtIndex) * sizeof(T)); 103 memcpy(loc, inItem, delta); 104 105 fItemCount += inNumItems; 106 } 107 //------------------------------------------------------------------------------ 108 template <class T> 109 void 110 _BTextViewSupportBuffer_<T>::RemoveItemsAt(int32 inNumItems, 111 int32 inAtIndex) 112 { 113 if (inNumItems < 1) 114 return; 115 116 inAtIndex = (inAtIndex > fItemCount - 1) ? (fItemCount - 1) : inAtIndex; 117 inAtIndex = (inAtIndex < 0) ? 0 : inAtIndex; 118 119 T *loc = fBuffer + inAtIndex; 120 memmove(loc, loc + inNumItems, 121 (fItemCount - (inNumItems + inAtIndex)) * sizeof(T)); 122 123 int32 delta = inNumItems * sizeof(T); 124 int32 logSize = fItemCount * sizeof(T); 125 uint32 extraSize = fBufferCount - (logSize - delta); 126 if (extraSize > (fExtraCount * sizeof(T))) { 127 fBufferCount = (logSize - delta) + (fExtraCount * sizeof(T)); 128 fBuffer = (T *)realloc(fBuffer, fBufferCount); 129 } 130 131 fItemCount -= inNumItems; 132 } 133 //------------------------------------------------------------------------------ 134 template<class T> 135 inline int32 136 _BTextViewSupportBuffer_<T>::ItemCount() const 137 { 138 return fItemCount; 139 } 140 //------------------------------------------------------------------------------ 141 142 #endif // __TEXT_VIEW_SUPPORT_BUFFER__H__ 143 144 /* 145 * $Log $ 146 * 147 * $Id $ 148 * 149 */ 150