main.c
the main project file
After structuring the whole project, including all required libraries and defining all used functions and structs, now we must keep only the important things in the main.c
Our main.c only contains the most important things
main.c head:
In the head file we include all the required headers, libraries and macros to use 'em in our project:
#include "headers/includes.h" //? The file wchich includes all required libraries to work.
#include "headers/functions.h" //? Local library contains many functions for this project.
#define NUMBUTTONS 6main.c body:
in a well-strucured C project, the main.c body must only contains the main() function which itself only contains other functions calls, exactly like our code
Our main() function can be parted into 4 parts:
int main() {
// Part 1: Windows and buttons
// Part 2: Keys Listener
// Part 3: Preforming Actions
// Part 4: Cleaning Up
}Part 1: Defining Windows and Buttons for our UI
//PART 1: Windows and Buttons
setlocale(LC_ALL, ""); //? Support Non-Ascii characters for most Unix-Like terminals (source: includes.h => locale.h)
//* Initialize ncurses screen (Source: includes.h => ncurses.h)
initscr();
cbreak();
keypad(stdscr, TRUE);
curs_set(0);
//* Initialize color pairs
start_color();
init_pair(1, COLOR_BLACK, COLOR_WHITE);
init_pair(2, COLOR_BLACK, COLOR_GREEN);
//* Create welcome window
int max_y, max_x;
getmaxyx(stdscr, max_y, max_x);
WINDOW* welcome_win = newwin(max_y, max_x, 0, 0);
box(welcome_win, 0, 0);
refresh();
//* Print welcome message and description
const char* title = " Welcome to Etudiants Management Program ";
const char* btn = "Press Enter to Continue";
int title_len = strlen(title);
int btn_len = strlen(btn);
//? Print an ASCII Art as a logo
mvwprintw(welcome_win, max_y/2 - 6, max_x/2 - 45, "███████╗████████╗██╗ ██╗ ███╗ ███╗ █████╗ ███╗ ██╗ █████╗ ██████╗ ███████╗██████╗ \n");
mvwprintw(welcome_win, max_y/2 - 5, max_x/2 - 45, "██╔════╝╚══██╔══╝██║ ██║ ████╗ ████║██╔══██╗████╗ ██║██╔══██╗██╔════╝ ██╔════╝██╔══██╗\n");
mvwprintw(welcome_win, max_y/2 - 4, max_x/2 - 45, "█████╗ ██║ ██║ ██║ ██╔████╔██║███████║██╔██╗██║███████║██║ ██╗ █████╗ ██████╔╝\n");
mvwprintw(welcome_win, max_y/2 - 3, max_x/2 - 45, "██╔══╝ ██║ ██║ ██║ ██║╚██╔╝██║██╔══██║██║╚████║██╔══██║██║ ╚██╗██╔══╝ ██╔══██╗\n");
mvwprintw(welcome_win, max_y/2 - 2, max_x/2 - 45, "███████╗ ██║ ╚██████╔╝ ██║ ╚═╝ ██║██║ ██║██║ ╚███║██║ ██║╚██████╔╝███████╗██║ ██║\n");
mvwprintw(welcome_win, max_y/2 - 1, max_x/2 - 45, "╚══════╝ ╚═╝ ╚═════╝ ╚═╝ ╚═╝╚═╝ ╚═╝╚═╝ ╚══╝╚═╝ ╚═╝ ╚═════╝ ╚══════╝╚═╝ ╚═╝\n");
//? Pint the Title with bold and reversed format
wattron(welcome_win, A_BOLD | A_REVERSE); //turns on bold and reverse fromat
mvwprintw(welcome_win, max_y/2 + 3, max_x/2 - title_len/2, "%s", title);
wattroff(welcome_win, A_BOLD | A_REVERSE); //turns off bold and reverse fromat
//? Pint the Description with bold and blink effect
wattron(welcome_win, A_BOLD | A_BLINK); //turn on bold and blink effect
mvwprintw(welcome_win, max_y/2 + 5, max_x/2 - btn_len/2, "%s", btn);
wattroff(welcome_win, A_BOLD | A_BLINK); //turn on bold and blink effect
//* Refresh welcome screen
wrefresh(welcome_win);
//! A key listener: Wait for user to click Enter to continue
int ch = getch();
while (ch != '\n') {
ch = getch();
}
//* Delete welcome screen
delwin(welcome_win);
MAIN:
//* Create main window
getmaxyx(stdscr, max_y, max_x);
WINDOW* mainwin = newwin(max_y, max_x, 0, 0);
box(mainwin, 0, 0);
refresh();
//* Create buttons
const char *ttl = "Students Management:";
int ttl_len = strlen(ttl);
char *button_labels[6] = {
"Add Students",
"Display Students",
"Search Students",
"Modify Students",
"Delete Students",
"Average Calculator"
};
int current_button = 0;
wattron(mainwin, A_BOLD);
mvwprintw(mainwin, max_y/2 -11, max_x/2 - ttl_len/2, "%s", ttl);
wattroff(mainwin, A_BOLD);
mvprintw(LINES-2, 2, "Press Q key to exit...");
WINDOW* button_wins[NUMBUTTONS];
for (int i = 0; i < NUMBUTTONS; i++) {
button_wins[i] = subwin(mainwin, 3, 20, max_y/2 + i*3 - NUMBUTTONS*3/2, max_x/2 - 10);
wbkgd(button_wins[i], COLOR_PAIR(1));
box(button_wins[i], 0, 0);
mvwprintw(button_wins[i], 1, 1, button_labels[i]);
}
wbkgd(button_wins[current_button], COLOR_PAIR(2));
wrefresh(mainwin);
...Part 2: Keys Listener
setting up a keys listener to record keyboard clicks, we actually have only 3 cases: Key Up, Key Down: to browse through the options. Enter Key: to confirm/access to an option. Q key: to quite the program.
//Part 2: Keys Listener
// Main loop
bool quit = false;
while (!quit) {
int ch = getch();
switch (ch) {
case KEY_DOWN: // case key down clicked
/*
Here we switch the colors pairs from white to green to make button appears like it's active (the selected one)
So used can knows which button possition he's on
*/
wbkgd(button_wins[current_button], COLOR_PAIR(1));
wrefresh(button_wins[current_button]);
current_button = (current_button + 1) % NUMBUTTONS;
wbkgd(button_wins[current_button], COLOR_PAIR(2));
wrefresh(button_wins[current_button]);
break;
case KEY_UP: // case of key up clicked
wbkgd(button_wins[current_button], COLOR_PAIR(1));
wrefresh(button_wins[current_button]);
current_button = (current_button - 1 + NUMBUTTONS) % NUMBUTTONS;
wbkgd(button_wins[current_button], COLOR_PAIR(2));
wrefresh(button_wins[current_button]);
break;
case '\n': // case of Enter clicked
//Part 3: Preforming Actions
break;
case 'q': // case of lowercase q
case 'Q': // case of uppercase Q
quit = true; // break the loop and exit program
break;
}
}
Part 3: Preforming actions
Here we give each button it's function using if else cases and button index variable we called "current_button":
//Part 3: Preforming Actions
if (current_button == 0) {
addStudent();
} else if (current_button == 1) {
display_students();
} else if (current_button == 2) {
searchStudent();
} else if (current_button == 3) {
update_student();
} else if (current_button == 4) {
delete_student();
} else if (current_button == 5) {
calculateAverage();
}
// Cleaning up after finishing the function job
mvprintw(LINES-2, 2, "Press any key to continue...");
getch(); //* Wait for user input
clear(); //! Clear the screen
box(mainwin, 0, 0); //* Redraw main window border
wrefresh(mainwin); //* Refresh main window
goto MAIN; //* Go back to main loopLast updated
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