* Copyright 2001-2010, Haiku, Inc.
* Distributed under the terms of the MIT License.
*/
#ifndef __TEXT_VIEW_SUPPORT_BUFFER__H__
#define __TEXT_VIEW_SUPPORT_BUFFER__H__
#include <cstdlib>
#include <cstring>
#include <OS.h>
#include <SupportDefs.h>
template <class T>
class _BTextViewSupportBuffer_ {
public:
_BTextViewSupportBuffer_(int32 inExtraCount = 0, int32 inCount = 0);
virtual ~_BTextViewSupportBuffer_();
void InsertItemsAt(int32 inNumItems, int32 inAtIndex, const T* inItem);
void RemoveItemsAt(int32 inNumItems, int32 inAtIndex);
int32 ItemCount() const;
protected:
int32 fExtraCount;
int32 fItemCount;
int32 fBufferCount;
T* fBuffer;
};
template <class T>
_BTextViewSupportBuffer_<T>::_BTextViewSupportBuffer_(int32 inExtraCount,
int32 inCount)
: fExtraCount(inExtraCount),
fItemCount(inCount),
fBufferCount(fExtraCount + fItemCount),
fBuffer(NULL)
{
fBuffer = (T*)calloc(fExtraCount + fItemCount, sizeof(T));
}
template <class T>
_BTextViewSupportBuffer_<T>::~_BTextViewSupportBuffer_()
{
free(fBuffer);
}
template <class T>
void
_BTextViewSupportBuffer_<T>::InsertItemsAt(int32 inNumItems,
int32 inAtIndex,
const T* inItem)
{
if (inNumItems < 1)
return;
inAtIndex = (inAtIndex > fItemCount) ? fItemCount : inAtIndex;
inAtIndex = (inAtIndex < 0) ? 0 : inAtIndex;
int32 delta = inNumItems * sizeof(T);
int32 logSize = fItemCount * sizeof(T);
if ((logSize + delta) >= fBufferCount) {
fBufferCount = logSize + delta + (fExtraCount * sizeof(T));
fBuffer = (T*)realloc((void*)fBuffer, fBufferCount);
if (fBuffer == NULL)
debugger("InsertItemsAt(): reallocation failed");
}
T* loc = fBuffer + inAtIndex;
memmove((void*)(loc + inNumItems), (void*)loc,
(fItemCount - inAtIndex) * sizeof(T));
memcpy((void*)loc, (void*)inItem, delta);
fItemCount += inNumItems;
}
template <class T>
void
_BTextViewSupportBuffer_<T>::RemoveItemsAt(int32 inNumItems,
int32 inAtIndex)
{
if (inNumItems < 1)
return;
inAtIndex = (inAtIndex > fItemCount - 1) ? (fItemCount - 1) : inAtIndex;
inAtIndex = (inAtIndex < 0) ? 0 : inAtIndex;
T* loc = fBuffer + inAtIndex;
memmove(loc, loc + inNumItems,
(fItemCount - (inNumItems + inAtIndex)) * sizeof(T));
int32 delta = inNumItems * sizeof(T);
int32 logSize = fItemCount * sizeof(T);
uint32 extraSize = fBufferCount - (logSize - delta);
if (extraSize > (fExtraCount * sizeof(T))) {
fBufferCount = (logSize - delta) + (fExtraCount * sizeof(T));
fBuffer = (T*)realloc(fBuffer, fBufferCount);
if (fBuffer == NULL)
debugger("RemoveItemsAt(): reallocation failed");
}
fItemCount -= inNumItems;
}
template<class T>
inline int32
_BTextViewSupportBuffer_<T>::ItemCount() const
{
return fItemCount;
}
#endif
