* Copyright 2001-2006, Haiku, Inc. All Rights Reserved.
* Distributed under the terms of the MIT License.
*
* Authors:
* Marc Flerackers (mflerackers@androme.be)
*/
#include "LineBuffer.h"
BTextView::LineBuffer::LineBuffer()
: _BTextViewSupportBuffer_<STELine>(20, 2)
{
}
BTextView::LineBuffer::~LineBuffer()
{
}
void
BTextView::LineBuffer::InsertLine(STELine* inLine, int32 index)
{
InsertItemsAt(1, index, inLine);
}
void
BTextView::LineBuffer::RemoveLines(int32 index, int32 count)
{
RemoveItemsAt(count, index);
}
void
BTextView::LineBuffer::RemoveLineRange(int32 fromOffset, int32 toOffset)
{
int32 fromLine = OffsetToLine(fromOffset);
int32 toLine = OffsetToLine(toOffset);
int32 count = toLine - fromLine;
if (count > 0)
RemoveLines(fromLine + 1, count);
BumpOffset(fromOffset - toOffset, fromLine + 1);
}
int32
BTextView::LineBuffer::OffsetToLine(int32 offset) const
{
int32 minIndex = 0;
int32 maxIndex = fItemCount - 1;
int32 index = 0;
while (minIndex < maxIndex) {
index = (minIndex + maxIndex) >> 1;
if (offset >= fBuffer[index].offset) {
if (offset < fBuffer[index + 1].offset)
break;
else
minIndex = index + 1;
} else
maxIndex = index;
}
return index;
}
int32
BTextView::LineBuffer::PixelToLine(float pixel) const
{
int32 minIndex = 0;
int32 maxIndex = fItemCount - 1;
int32 index = 0;
while (minIndex < maxIndex) {
index = (minIndex + maxIndex) >> 1;
if (pixel >= fBuffer[index].origin) {
if (pixel < fBuffer[index + 1].origin)
break;
else
minIndex = index + 1;
} else
maxIndex = index;
}
return index;
}
void
BTextView::LineBuffer::BumpOrigin(float delta, int32 index)
{
for (long i = index; i < fItemCount; i++)
fBuffer[i].origin += delta;
}
void
BTextView::LineBuffer::BumpOffset(int32 delta, int32 index)
{
for (long i = index; i < fItemCount; i++)
fBuffer[i].offset += delta;
}
float
BTextView::LineBuffer::MaxWidth() const
{
if (fItemCount == 0)
return 0;
float maxWidth = 0;
STELine* line = &fBuffer[0];
for (int32 i = 0; i < fItemCount; i++) {
if (maxWidth < line->width)
maxWidth = line->width;
line++;
}
return maxWidth;
}
