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/*
** Copyright 2002, Double Precision Inc.
**
** See COPYING for distribution information.
*/
#ifndef cursesvscroll_H
#define cursesvscroll_H
#include "mycurses.H"
#include "cursescontainer.H"
//
// A vertically-scrolling viewport. The subclass must define getWidth()
// and getHeight().
//
class CursesVScroll : public CursesContainer {
size_t firstRowShown;
public:
CursesVScroll(CursesContainer *parent);
~CursesVScroll();
// When something is deleted from the viewport, jump the view port
// to the top
void deleteChild(Curses *child);
// Automatically scroll the viewport to following keyboard input.
// This is done by overriding getCursorPosition(), calling
// scrollTo(), then simply subtracting the topmost row shown.
int getCursorPosition(int &row, int &col);
//
// Adjust for vertical scroll position:
//
bool writeText(const char *text, int row, int col,
const CursesAttr &attr) const;
bool writeText(const std::vector<unicode_char> &text,
int row, int col,
const Curses::CursesAttr &attr) const;
//
// Make sure the following row is visible right now.
//
void scrollTo(size_t rowNum);
// Intercept getVerticalViewport(), and return reality.
void getVerticalViewport(size_t &first_row,
size_t &nrows);
void erase();
int getWidth() const;
size_t getFirstRowShown() const { return firstRowShown; }
void setFirstRowShown(size_t rowNum)
{
firstRowShown=rowNum;
redraw();
}
private:
void redraw();
};
#endif
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