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/* $Id: cursesvscroll.C,v 1.1 2003/05/27 14:09:07 mrsam Exp $
**
** Copyright 2002, Double Precision Inc.
**
** See COPYING for distribution information.
*/
#include "curses_config.h"
#include "cursesvscroll.H"
using namespace std;
CursesVScroll::CursesVScroll(CursesContainer *parent)
: CursesContainer(parent), firstRowShown(0)
{
}
CursesVScroll::~CursesVScroll()
{
}
int CursesVScroll::getCursorPosition(int &row, int &col)
{
scrollTo(row);
row -= firstRowShown;
return (CursesContainer::getCursorPosition(row, col));
}
int CursesVScroll::getWidth() const
{
return getScreenWidth();
}
void CursesVScroll::getVerticalViewport(size_t &first_row,
size_t &nrows)
{
first_row=firstRowShown;
nrows=getHeight();
}
void CursesVScroll::erase()
{
size_t w=getWidth(), h=getHeight();
vector<wchar_t> spaces;
spaces.insert(spaces.end(), w, ' ');
spaces.insert(spaces.end(), 1, 0);
size_t i;
for (i=0; i<h; i++)
CursesContainer::writeText(&*spaces.begin(), i, 0,
CursesAttr());
}
void CursesVScroll::deleteChild(Curses *child)
{
CursesContainer::deleteChild(child);
scrollTo(0);
}
void CursesVScroll::scrollTo(size_t row)
{
size_t h=getHeight();
#if 0
if (row < 0 || (size_t)row < h)
{
if (firstRowShown > 0)
{
firstRowShown=0;
redraw();
}
}
else
#endif
if ((size_t)row < firstRowShown)
{
if (row + 1 < firstRowShown)
firstRowShown=row;
else
{
if (h > 6)
{
firstRowShown=row+5;
if (firstRowShown >= h)
firstRowShown -= h;
else
firstRowShown=0;
}
else
firstRowShown=row;
}
redraw();
}
else if ((size_t)row >= firstRowShown + h)
{
if (firstRowShown + h < (size_t)row)
{
firstRowShown=row + 1 - h;
}
else
{
if (h > 6)
firstRowShown=row-5;
else
firstRowShown=row + 1 - h;
}
redraw();
}
}
bool CursesVScroll::writeText(const char *text, int row, int col,
const CursesAttr &attr) const
{
if (row < 0 ||
(size_t)row < firstRowShown ||
(size_t)row >= firstRowShown + getHeight())
return false; // This row is not shown
row -= firstRowShown;
return CursesContainer::writeText(text, row, col, attr);
}
bool CursesVScroll::writeText(const wchar_t *text, int row, int col,
const CursesAttr &attr) const
{
if (row < 0 ||
(size_t)row < firstRowShown ||
(size_t)row >= firstRowShown + getHeight())
return false; // Ditto.
row -= firstRowShown;
return CursesContainer::writeText(text, row, col, attr);
}
//
// We just logically scrolled. Clear the window, redraw.
//
void CursesVScroll::redraw()
{
erase();
draw();
}
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