commit 59d4d613310595bceb2e630e75e4d08a743c24ec
parent cbc68925f48430317bc78884e6175082a4d2cb7a
Author: mjkloeckner <martinjkloeckner@gmail.com>
Date: Thu, 14 Mar 2024 23:22:58 -0300
Added ej 11 solution: Build an interactive menu
Only for *NIX based systems since windows doesn't support termios.h
Diffstat:
| A | solutions/ej11.cpp | | | 158 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
1 file changed, 158 insertions(+), 0 deletions(-)
diff --git a/solutions/ej11.cpp b/solutions/ej11.cpp
@@ -0,0 +1,158 @@
+/* Termios solo funciona en sistemas basados en UNIX */
+
+#include <iostream>
+#include <string>
+#include <cstdio>
+#include <cstdlib>
+#include <csignal>
+#include <termios.h>
+
+using namespace std;
+
+const unsigned int menu_items = 4;
+static struct termios default_attributes;
+
+char cursor[menu_items] = {0};
+unsigned int cursor_pos;
+bool run_program;
+
+string menu[menu_items] = {
+ "Español",
+ "English",
+ "Deutsch",
+ "Português"
+};
+
+void sig_handler(int signo) {
+ signal(signo, SIG_IGN);
+ if ((signo == SIGINT) || (signo == SIGQUIT)) {
+ run_program = false;
+ exit(0);
+ }
+}
+
+void set_input_mode (void) {
+ struct termios tattr;
+
+ if (!isatty(STDIN_FILENO)) {
+ cerr << "Not a terminal" << endl;
+ exit (EXIT_FAILURE);
+ }
+
+ tcgetattr(STDIN_FILENO, &default_attributes);
+
+ /* hide cursor */
+ printf("\033[?25l");
+
+ /* Set the terminal modes. */
+ tcgetattr(STDIN_FILENO, &tattr);
+ tattr.c_lflag &= ~(ICANON|ECHO); /* Clear ICANON and ECHO. */
+ tattr.c_cc[VMIN] = 1;
+ tattr.c_cc[VTIME] = 0;
+ tcsetattr(STDIN_FILENO, TCSAFLUSH, &tattr);
+}
+
+void reset_input_mode (void) {
+ tcsetattr(STDIN_FILENO, TCSANOW, &default_attributes);
+
+ /* show cursor */
+ printf("\033[?25h");
+}
+
+void print_menu(void) {
+ for(size_t i = 0; i < menu_items; ++i) {
+ cursor[cursor_pos] = ((i == cursor_pos) ? '>' : ' ');
+ cout << cursor[cursor_pos] << menu[i] << (i == menu_items ? "" : "\n")
+ << flush;
+ }
+}
+
+void clear_menu(void) {
+ cout << "\033[" << menu_items << "A";
+}
+
+void refresh_menu(void) {
+ clear_menu();
+ print_menu();
+}
+
+void move_cursor_up() {
+ if(cursor_pos >= 1)
+ cursor_pos--;
+ else cursor_pos = (menu_items - 1);
+}
+
+void move_cursor_down() {
+ if(cursor_pos < (menu_items - 1))
+ cursor_pos++;
+ else cursor_pos = 0;
+}
+
+int main (void) {
+ const clock_t start = clock();
+ char cmd;
+ unsigned int selected_item;
+ run_program = true;
+ cursor_pos = 0;
+ selected_item = menu_items;
+
+ set_input_mode();
+ signal(SIGINT, sig_handler);
+ signal(SIGQUIT, sig_handler);
+ signal(SIGTSTP, SIG_IGN);
+ atexit(reset_input_mode);
+
+ print_menu();
+ while(run_program) {
+ clock_t now = clock();
+ clock_t delta = (now - start);
+ cin.get(cmd);
+ switch(cmd) {
+ case 'w':
+ case 'k':
+ move_cursor_up();
+ refresh_menu();
+ break;
+ case 's':
+ case 'j':
+ move_cursor_down();
+ refresh_menu();
+ break;
+ case 'q':
+ run_program = false;
+ break;
+ case 10: // Enter
+ case ' ':
+ selected_item = cursor_pos;
+ run_program = false;
+ break;
+ case 27: { // Escape codes i.e. arrow keys
+ cin.get(cmd); // skip '['
+ cin.get(cmd);
+ switch (cmd) {
+ case 'A':
+ move_cursor_up();
+ refresh_menu();
+ break;
+ case 'B':
+ move_cursor_down();
+ refresh_menu();
+ break;
+ case 'c':
+ run_program = false;
+ break;
+ default:
+ break;
+ }
+ }
+ default:
+ continue;
+ }
+ }
+
+ clear_menu();
+ if(selected_item != menu_items)
+ cout << "You selected: `" << menu[selected_item] << "`" << endl;
+
+ exit(EXIT_SUCCESS);
+}
