haiku/src/kits/interface/BTextView/LineBuffer.cpp
Stefano Ceccherini 94be8cb515 BTextView implementation by Marc Flerackers (with few additions of mine). Still incomplete, it works, tough.
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2127 a95241bf-73f2-0310-859d-f6bbb57e9c96
2002-12-02 20:14:03 +00:00

136 lines
4.5 KiB
C++

//------------------------------------------------------------------------------
// Copyright (c) 2001-2002, OpenBeOS
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// File Name: LineBuffer.cpp
// Author: Marc Flerackers (mflerackers@androme.be)
// Description: Line storage used by BTextView
//------------------------------------------------------------------------------
// Standard Includes -----------------------------------------------------------
#include <string.h>
// System Includes -------------------------------------------------------------
#include "LineBuffer.h"
// Project Includes ------------------------------------------------------------
// Local Includes --------------------------------------------------------------
// Local Defines ---------------------------------------------------------------
// Globals ---------------------------------------------------------------------
//------------------------------------------------------------------------------
_BLineBuffer_::_BLineBuffer_()
: fBlockSize(20),
fItemCount(2),
fPhysicalSize(22),
fObjectList(NULL)
{
fObjectList = new STELine[fPhysicalSize];
memset(fObjectList, 0, fPhysicalSize * sizeof(STELine));
}
//------------------------------------------------------------------------------
_BLineBuffer_::~_BLineBuffer_()
{
delete[] fObjectList;
}
//------------------------------------------------------------------------------
void _BLineBuffer_::InsertLine(STELine *line, int32 index)
{
if (fItemCount == fPhysicalSize - 1)
{
STELine *new_list = new STELine[fPhysicalSize + fBlockSize];
memcpy(new_list, fObjectList, fPhysicalSize * sizeof(STELine));
delete fObjectList;
fObjectList = new_list;
fPhysicalSize += fBlockSize;
}
if (index < fItemCount)
memmove(fObjectList + index + 1, fObjectList + index,
(fItemCount - index) * sizeof(STELine));
memcpy(fObjectList + index, line, sizeof(STELine));
fItemCount++;
}
//------------------------------------------------------------------------------
void _BLineBuffer_::RemoveLines(int32 index, int32 count)
{
memmove(fObjectList + index, fObjectList + index + count,
(fItemCount - index - count) * sizeof(STELine));
fItemCount -= count;
}
//------------------------------------------------------------------------------
void _BLineBuffer_::RemoveLineRange(int32 from, int32 to)
{
int32 linefrom = OffsetToLine(from);
int32 lineto = OffsetToLine(to);
if (linefrom < lineto)
RemoveLines(linefrom + 1, lineto - linefrom);
BumpOffset(linefrom + 1, from - to);
}
//------------------------------------------------------------------------------
int32 _BLineBuffer_::OffsetToLine(int32 offset) const
{
if (offset == 0)
return 0;
for (int i = 0; i < fItemCount; i++)
{
if (offset < fObjectList[i].fOffset)
return i - 1;
}
return fItemCount - 2;
}
//------------------------------------------------------------------------------
int32 _BLineBuffer_::PixelToLine(float height) const
{
for (int i = 0; i < fItemCount; i++)
{
if (height < fObjectList[i].fHeight)
return i - 1;
}
return fItemCount - 2;
}
//------------------------------------------------------------------------------
void _BLineBuffer_::BumpOffset(int32 line, int32 offset)
{
for (int i = line; i < fItemCount; i++)
fObjectList[i].fOffset += offset;
}
//------------------------------------------------------------------------------
/*
* $Log $
*
* $Id $
*
*/