menu.c

unix下的菜单设计

#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_BLUE,COLOR_WHITE);
       init_pair(3,COLOR_RED,COLOR_WHITE);
       curs_set(0);
       noecho();
       keypad(stdscr,TRUE);
}
void draw_menubar(WINDOW *menubar)
{
       wbkgd(menubar,COLOR_PAIR(2));
       waddstr(menubar,"第一个菜单");
       wattron(menubar,COLOR_PAIR(3));
       waddstr(menubar,"(F1)");
       wattroff(menubar,COLOR_PAIR(3));
       wmove(menubar,0,20);
       waddstr(menubar,"第二个菜单");
       wattron(menubar,COLOR_PAIR(3));
       waddstr(menubar,"(F2)");
       wattroff(menubar,COLOR_PAIR(3));
}
WINDOW **draw_menu(int start_col)
{
       int i;
       WINDOW **items;
       items=(WINDOW **)malloc(9*sizeof(WINDOW *));

       items[0]=newwin(10,19,1,start_col);
       wbkgd(items[0],COLOR_PAIR(2));
       box(items[0],ACS_VLINE,ACS_HLINE);
       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[i],"菜单项目%d",i);
       wbkgd(items[1],COLOR_PAIR(1));
       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(20-menu_start_col);
                       return scroll_menu(items,8,20-menu_start_col);
               } else if (key==ESCAPE) {
                       return -1;
               } else if (key==ENTER) {
                       return selected;
               }
       }
}
int main()
{
   int key;
   WINDOW *menubar,*messagebar;
   
   init_curses();
   
   bkgd(COLOR_PAIR(1));
   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("ESC quits.");
   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,8,0);
           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_menu(20);
           selected_item=scroll_menu(menu_items,8,20);
           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();
       }
   } while (key!=ESCAPE);
   
   delwin(menubar);
   delwin(messagebar);
   endwin();
   return 0;
}