146 lines
4.2 KiB
C++
146 lines
4.2 KiB
C++
//------------------------------------------------------------------------------
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// Copyright (c) 2001-2004, Haiku, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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// File Name: TextViewSupportBuffer.h
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// Authors Marc Flerackers (mflerackers@androme.be)
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// Stefano Ceccherini (burton666@libero.it)
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// Description: Template class used to implement the various BTextView
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// buffer classes.
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//------------------------------------------------------------------------------
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#ifndef __TEXT_VIEW_SUPPORT_BUFFER__H__
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#define __TEXT_VIEW_SUPPORT_BUFFER__H__
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#include <cstdlib>
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#include <cstring>
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#include <OS.h>
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#include <SupportDefs.h>
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// _BTextViewSupportBuffer_ class ----------------------------------------------
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template <class T>
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class _BTextViewSupportBuffer_ {
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public:
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_BTextViewSupportBuffer_(int32 inExtraCount = 0, int32 inCount = 0);
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virtual ~_BTextViewSupportBuffer_();
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void InsertItemsAt(int32 inNumItems, int32 inAtIndex, const T *inItem);
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void RemoveItemsAt(int32 inNumItems, int32 inAtIndex);
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int32 ItemCount() const;
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protected:
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int32 fExtraCount;
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int32 fItemCount;
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int32 fBufferCount;
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T* fBuffer;
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};
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template <class T>
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_BTextViewSupportBuffer_<T>::_BTextViewSupportBuffer_(int32 inExtraCount,
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int32 inCount)
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: fExtraCount(inExtraCount),
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fItemCount(inCount),
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fBufferCount(fExtraCount + fItemCount),
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fBuffer(NULL)
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{
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fBuffer = (T *)calloc(fExtraCount + fItemCount, sizeof(T));
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}
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template <class T>
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_BTextViewSupportBuffer_<T>::~_BTextViewSupportBuffer_()
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{
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free(fBuffer);
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}
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template <class T>
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void
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_BTextViewSupportBuffer_<T>::InsertItemsAt(int32 inNumItems,
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int32 inAtIndex,
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const T *inItem)
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{
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if (inNumItems < 1)
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return;
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inAtIndex = (inAtIndex > fItemCount) ? fItemCount : inAtIndex;
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inAtIndex = (inAtIndex < 0) ? 0 : inAtIndex;
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int32 delta = inNumItems * sizeof(T);
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int32 logSize = fItemCount * sizeof(T);
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if ((logSize + delta) >= fBufferCount) {
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fBufferCount = logSize + delta + (fExtraCount * sizeof(T));
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fBuffer = (T *)realloc(fBuffer, fBufferCount);
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if (fBuffer == NULL)
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debugger("InsertItemsAt(): reallocation failed");
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}
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T *loc = fBuffer + inAtIndex;
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memmove(loc + inNumItems, loc, (fItemCount - inAtIndex) * sizeof(T));
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memcpy(loc, inItem, delta);
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fItemCount += inNumItems;
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}
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template <class T>
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void
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_BTextViewSupportBuffer_<T>::RemoveItemsAt(int32 inNumItems,
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int32 inAtIndex)
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{
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if (inNumItems < 1)
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return;
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inAtIndex = (inAtIndex > fItemCount - 1) ? (fItemCount - 1) : inAtIndex;
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inAtIndex = (inAtIndex < 0) ? 0 : inAtIndex;
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T *loc = fBuffer + inAtIndex;
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memmove(loc, loc + inNumItems,
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(fItemCount - (inNumItems + inAtIndex)) * sizeof(T));
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int32 delta = inNumItems * sizeof(T);
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int32 logSize = fItemCount * sizeof(T);
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uint32 extraSize = fBufferCount - (logSize - delta);
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if (extraSize > (fExtraCount * sizeof(T))) {
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fBufferCount = (logSize - delta) + (fExtraCount * sizeof(T));
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fBuffer = (T *)realloc(fBuffer, fBufferCount);
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if (fBuffer == NULL)
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debugger("RemoveItemsAt(): reallocation failed");
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}
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fItemCount -= inNumItems;
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}
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template<class T>
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inline int32
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_BTextViewSupportBuffer_<T>::ItemCount() const
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{
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return fItemCount;
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}
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#endif // __TEXT_VIEW_SUPPORT_BUFFER__H__
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