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#ifndef SCREEN_H
#define SCREEN_H
#include <string>
#include <vector>
#include <iostream>
class Screen;
class Window_mgr {
public:
using screen_index = std::vector<Screen>::size_type; // size type
void clear(screen_index); // clear screen
Window_mgr(); //
private:
std::vector<Screen> screens; // private data member
};
class Screen {
friend void Window_mgr::clear(screen_index); // Tell screen class we have a friend function from Window_mgr
public:
using pos = std::string::size_type; // pos type
using content_type = char; // content type
Screen() = default;
Screen(pos ht, pos wd): height(ht), width(wd), contents(ht * wd, ' ') {}
Screen(pos ht, pos wd, content_type c): height(ht), width(wd), contents(ht * wd, c) {}
const content_type &get() const { return contents[cursor]; }
const content_type &get(pos row, pos col) const;
Screen &set(content_type c);
Screen &set(pos row, pos col, content_type c);
Screen &move(pos row, pos col);
const Screen &display(std::ostream &os) const;
Screen &display(std::ostream &os);
private:
void do_display(std::ostream &os) const;
pos cursor = 0;
pos height = 0;
pos width = 0;
std::string contents;
};
inline
const Screen::content_type &Screen::get(pos row, pos col) const {
return contents[row * width + col];
}
inline
Screen &Screen::set(content_type c) {
contents[cursor] = c;
return *this;
}
inline
Screen &Screen::set(pos row, pos col, content_type c) {
contents[row * width + col] = c;
return *this;
}
inline
Screen &Screen::move(pos row, pos col) {
cursor = row * width + col;
return *this;
}
inline
const Screen &Screen::display(std::ostream &os) const {
do_display(os);
return *this;
}
inline
Screen &Screen::display(std::ostream &os) {
do_display(os);
return *this;
}
inline
void Screen::do_display(std::ostream &os) const {
for (pos i = 0; i != contents.size(); ++i) {
os << contents[i];
if ((i + 1) % width == 0 && i + 1 != contents.size())
os << "\n";
}
}
Window_mgr::Window_mgr() : screens{Screen(24, 80)} {}
void Window_mgr::clear(screen_index i) {
Screen &s = screens[i];
s.contents = std::string(s.height * s.width, ' ');
}
#endif
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