Creating menu driven environment in C
#include <curses.h>
#include <stdlib.h>
#define ENTER 10
#define ESCAPE 27
void init_curses()
{
initscr();
start_color();
init_pair(1,COLOR_WHITE,COLOR_BLUE);
init_pair(2,COLOR_RED,COLOR_GREEN);
init_pair(3,COLOR_RED,COLOR_WHITE);
init_pair(4,COLOR_BLUE,COLOR_YELLOW);
init_pair(5,COLOR_BLUE,COLOR_CYAN);
curs_set(0);
noecho();
keypad(stdscr,TRUE);
}
void draw_menubar(WINDOW *menubar)
{
wbkgd(menubar,COLOR_PAIR(5));
waddstr(menubar,"File");
wattron(menubar,COLOR_PAIR(3));
waddstr(menubar,"(F1)");
wattroff(menubar,COLOR_PAIR(3));
wmove(menubar,0,10);
waddstr(menubar,"Edit");
wattron(menubar,COLOR_PAIR(3));
waddstr(menubar,"(F2)");
wmove(menubar,0,20);
wattroff(menubar,COLOR_PAIR(3));
waddstr(menubar,"Search");
wattron(menubar,COLOR_PAIR(3));
waddstr(menubar,"(F3)");
wmove(menubar,0,31);
wattroff(menubar,COLOR_PAIR(3));
waddstr(menubar,"Cursor ");
wattron(menubar,COLOR_PAIR(3));
waddstr(menubar,"(F4)");
wmove(menubar,0,43);
wattroff(menubar,COLOR_PAIR(3));
waddstr(menubar,"Compile");
wattron(menubar,COLOR_PAIR(3));
waddstr(menubar,"(F5)");
wattroff(menubar,COLOR_PAIR(3));
wmove(menubar,0,56);
waddstr(menubar,"Help");
wattron(menubar,COLOR_PAIR(3));
waddstr(menubar,"(F6)");
wattroff(menubar,COLOR_PAIR(3));
wmove(menubar,0,66);
waddstr(menubar,"Exit");
wattron(menubar,COLOR_PAIR(3));
waddstr(menubar,"(F7)");
}
WINDOW **draw_menu(int start_col)
{
int i;
WINDOW **items;
items=(WINDOW **)malloc(9*sizeof(WINDOW *));
items[0]=newwin(6,19,1,start_col);
wbkgd(items[0],COLOR_PAIR(2));
// box(items[0],ACS_VLINE,ACS_HLINE);
//wprintw(items[1],"new");
items[1]=subwin(items[0],1,17,2,start_col+1);
items[2]=subwin(items[0],1,17,3,start_col+1);
items[3]=subwin(items[0],1,17,4,start_col+1);
items[4]=subwin(items[0],1,17,5,start_col+1);
items[5]=subwin(items[0],1,17,6,start_col+1);
items[6]=subwin(items[0],1,17,7,start_col+1);
/// items[7]=subwin(items[0],1,17,8,start_col+1);
// items[8]=subwin(items[0],1,17,9,start_col+1);
/// for (i=1;i<9;i++)
wprintw(items[1],"Load",i);
wprintw(items[2],"New",i);
wprintw(items[3],"Save");
wprintw(items[4],"Save as");
wprintw(items[5],"Printer");
/// wprintw(items[],"FILE%d",i);
/// wprintw(item[1],"File%d",i);
// wbkgd(items[1],COLOR_PAIR(1));
wrefresh(items[0]);
return items;
}
WINDOW **draw_menu2(int start_col)
{
int i;
WINDOW **items;
items=(WINDOW**) malloc(9*sizeof(WINDOW*));
items[0]=newwin(5,19,1,start_col);
wbkgd(items[0],COLOR_PAIR(2));
items[1]=subwin(items[0],1,17,2,start_col+1);
items[2]=subwin(items[0],1,17,3,start_col+1);
items[3]=subwin(items[0],1,17,4,start_col+1);
items[4]=subwin(items[0],1,17,5,start_col+1);
items[5]=subwin(items[0],1,17,6,start_col+1);
items[6]=subwin(items[0],1,17,7,start_col+1);
wprintw(items[1],"Find");
wprintw(items[2],"Find and replace");
wprintw(items[3],"Repeat last find");
wprintw(items[4],"Goto line number");
wrefresh(items[0]);
return items;
}
WINDOW **draw_menu1(int start_col)
{
int i;
WINDOW **items;
items=(WINDOW**) malloc(9*sizeof(WINDOW*));
items[0]=newwin(6,19,1,start_col);
wbkgd(items[0],COLOR_PAIR(2));
items[1]=subwin(items[0],1,17,2,start_col+1);
items[2]=subwin(items[0],1,17,3,start_col+1);
items[3]=subwin(items[0],1,17,4,start_col+1);
items[4]=subwin(items[0],1,17,5,start_col+1);
items[5]=subwin(items[0],1,17,6,start_col+1);
items[6]=subwin(items[0],1,17,7,start_col+1);
wprintw(items[1],"Undo");
wprintw(items[2],"Cut");
wprintw(items[3],"Copy");
wprintw(items[4],"Paste");
wprintw(items[5],"Delete");
wrefresh(items[0]);
return items;
}
WINDOW **draw_menu4(int start_col)
{
int i;
WINDOW **items;
items=(WINDOW**) malloc(9*sizeof(WINDOW*));
items[0]=newwin(5,19,1,start_col);
wbkgd(items[0],COLOR_PAIR(2));
items[1]=subwin(items[0],1,17,2,start_col+1);
items[2]=subwin(items[0],1,17,2,start_col+1);
items[3]=subwin(items[0],1,17,4,start_col+1);
items[4]=subwin(items[0],1,17,4,start_col+1);
// items[5]=subwin(items[0],1,17,4,start_col+1);
// items[6]=subwin(items[0],1,17,4,start_col+1);
wprintw(items[2],"C Compiler");
wprintw(items[4],"C++ Compiler");
wrefresh(items[0]);
return items;
}
WINDOW **draw_menu5(int start_col)
{
int i;
WINDOW **items;
items=(WINDOW**) malloc(9*sizeof(WINDOW*));
items[0]=newwin(4,19,1,start_col);
wbkgd(items[0],COLOR_PAIR(2));
items[1]=subwin(items[0],1,17,2,start_col+1);
items[2]=subwin(items[0],1,17,2,start_col+1);
items[3]=subwin(items[0],1,17,2,start_col+1);
items[4]=subwin(items[0],1,17,4,start_col+1);
// items[5]=subwin(items[0],1,17,4,start_col+1);
// items[6]=subwin(items[0],1,17,4,start_col+1);
wprintw(items[2],"Key words");
// wprintw(items[4]," perator");
wprintw(items[4],"Operator");
// wprintw(items[6],"Help");
wrefresh(items[0]);
return items;
}
void delete_menu(WINDOW **items,int count)
{
int i;
for (i=0;i<count;i++)
delwin(items[i]);
free(items);
}
int scroll_menu(WINDOW **items,int count,int menu_start_col)
{
int key;
int selected=0;
while (1) {
key=getch();
if (key==KEY_DOWN || key==KEY_UP) {
wbkgd(items[selected+1],COLOR_PAIR(2));
wnoutrefresh(items[selected+1]);
if (key==KEY_DOWN) {
selected=(selected+1) % count;
} else {
selected=(selected+count-1) % count;
}
wbkgd(items[selected+1],COLOR_PAIR(1));
wnoutrefresh(items[selected+1]);
doupdate();
} else if (key==KEY_LEFT || key==KEY_RIGHT) {
delete_menu(items,count+1);
touchwin(stdscr);
refresh();
items=draw_menu(60-menu_start_col);
return scroll_menu(items,5,60-menu_start_col);
} else if (key==ESCAPE) {
return -1;
} else if (key==ENTER) {
return selected;
}
}
}
int main()
{
int key,t;
WINDOW *menubar,*messagebar,*window;
init_curses();
bkgd(COLOR_PAIR(1));
window=subwin(stdscr,1,80,24,0);
wbkgd(window,COLOR_PAIR(4));
menubar=subwin(stdscr,1,80,0,0);
messagebar=subwin(stdscr,1,79,23,1);
draw_menubar(menubar);
move(2,1);
printw("Press F1 or F2 to open the menus. ");
printw("F9 quits.");
/// window=newwin(2,68,23,8);
/// wbkgd(window,COLOR_PAIR(4));
///t=wgetch(window);
refresh();
do {
int selected_item;
WINDOW **menu_items;
key=getch();
werase(messagebar);
wrefresh(messagebar);
if (key==KEY_F(1))
{
menu_items=draw_menu(0);
selected_item=scroll_menu(menu_items,5,0);
delete_menu(menu_items,9);
if (selected_item<0)
wprintw(messagebar,
"You haven't selected any item.");
else
wprintw(messagebar, "You have selected menu item %d.",selected_item+1);
touchwin(stdscr);
refresh();
} else if (key==KEY_F(2))
{
menu_items=draw_menu1(10);
selected_item=scroll_menu(menu_items,5,10);
delete_menu(menu_items,9);
if (selected_item<0)
wprintw(messagebar,"You haven't selected any item.");
else
wprintw(messagebar, "You have selected menu item %d.",selected_item+1);
// touchwin(stdscr);
/// window=newwin(2,68,23,12);
///wbkgd(window,COLOR_PAIR(4));
/// t=wgetch(window);
touchwin(stdscr);
refresh();
}
else if(key==KEY_F(3))
{
menu_items=draw_menu2(20);
selected_item=scroll_menu(menu_items,5,20);
delete_menu(menu_items,9);
if(selected_item<0)
wprintw(messagebar,"don't select any item");
else
wprintw(messagebar, "You have select menu item %d",selected_item+1);
touchwin(stdscr);
refresh();
}
else if(key==KEY_F(5))
{
menu_items=draw_menu4(40);
selected_item=scroll_menu(menu_items,5,40);
delete_menu(menu_items,9);
if(selected_item<0)
wprintw(messagebar, "No item is selected");
else
wprintw(messagebar, "You have selected menu %d",selected_item+1);
touchwin(stdscr);
refresh();
}
else if(key==KEY_F(6))
{
menu_items=draw_menu5(55);
selected_item=scroll_menu(menu_items,5,55);
delete_menu(menu_items,9);
if(selected_item<0)
wprintw(messagebar,
" No item is selected");
else
wprintw(messagebar, "You have selected menu %d",selected_item+1);
touchwin(stdscr);
refresh();
}
else if(key==KEY_F(7))
{
menu_items=draw_menu4(60);
selected_item=scroll_menu(menu_items,5,60);
delete_menu(menu_items,9);
if(selected_item<0)
wprintw(messagebar, "No item is selected");
else
wprintw(messagebar, "You have to select menu %d",selected_item+1);
touchwin(stdscr);
refresh();
}
} while (key!=KEY_F(9));
delwin(menubar);
delwin(messagebar);
delwin(window);
endwin();
return 0;
}
