Subwindows in Java

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After creation, the subwindow can be addressed like any other window, named in a window-oriented command, deleted, or affected in the same was as regular windows. Subwindows can even have subwindows of their own.
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Your First Subwindow
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Subwindows exist totally within a parent window. In a way, it helps to think of them more as a region of the parent window, though the subwindow still maintains its own cursor and text, and attributes can be written directly to the subwindow just as with other windows in NCurses.
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subwin(win,rows,cols,y,x)
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The subwin() function creates the subwindow. win refers to the parent window, which can be stdscr, the standard screen. rows and cols gives the size of the subwindow in character rows and columns. Finally, the x and y represent the upper-left location of the subwindow relative to the screen, not the parent window org. When the subwin() function is successful, a new window is created, returned as a WINDOW pointer by subwin() (see line 13 in the kid1.c code in Listing 9-1). When the function fails, such as when no memory is available or the subwindow does not reside completely within the parent, NULL is returned.
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Listing 9-1: kid1.c
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 #include <ncurses.h> int main(void) { WINDOW *sonny; initscr(); start_color(); /* remember to check for errors! */ init_pair(1,COLOR_WHITE,COLOR_BLUE); init_pair(2,COLOR_RED,COLOR_YELLOW); /* create subwindow */ sonny = subwin(stdscr,5,20,10,30); if(sonny == NULL) { addstr( Unable to create subwindow\n ); endwin(); return 1; } /* color windows and splash some text */ bkgd(COLOR_PAIR(1));
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Listing 9-1 (continued)
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23 24 25 26 27 28 29 30 31 addstr( Hello, son. ); wbkgd(sonny,COLOR_PAIR(2)); waddstr(sonny, Hello, Dad. ); refresh(); getch(); endwin(); return 0; }
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The code uses color to help you locate the subwindow on the screen. Note that the start_color() function is used in this code without error checking; remember to do error checking, as well as use the has_colors() function for any code you plan on releasing publicly. (Sample output can be seen in Figure 9-1.)
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Your Second Subwindow
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The following code in Listing 9-2 is a modification of the original KID1.C source code. This time I ve added the derwin() function, which uses coordinates relative to the parent window to create the new subwindow. (Of course, because in both cases the parent is the standard screen, there really is no gross difference shown.)
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Listing 9-2: kid2.c
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 #include <ncurses.h> int main(void) { WINDOW *sonny,*babygirl; initscr(); start_color(); /* remember to check for errors! */ init_pair(1,COLOR_WHITE,COLOR_BLUE); init_pair(2,COLOR_RED,COLOR_YELLOW); init_pair(3,COLOR_CYAN,COLOR_WHITE); /* create subwindow and remember to check for errors! */ sonny = subwin(stdscr,5,20,10,30); babygirl = derwin(stdscr,5,20,1,50); /* color windows and splash some text */ bkgd(COLOR_PAIR(1)); addstr( Hello, son, hello baby girl. ); wbkgd(sonny,COLOR_PAIR(2));
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Listing 9-2 (continued)
21 22 23 24 25 26 27 28 29 waddstr(sonny, Hello, Dad. ); wbkgd(babygirl,COLOR_PAIR(3)); waddstr(babygirl, Hello, Papa. ); refresh(); getch(); endwin(); return 0; }
Sub-subwindows
Because a subwindow is considered a real window in nearly every sense, it s quite possible for a subwindow to have a subwindow of its own. You simply name the subwindow s variable as the win in the subwin() function, as the code in Listing 9-3 demonstrates.
Listing 9-3: kid3.c
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 #include <ncurses.h> int main(void) { WINDOW *grandpa,*father,*boy; int maxx,maxy; initscr(); start_color(); /* remember to check for errors! */ init_pair(1,COLOR_WHITE,COLOR_BLUE); init_pair(2,COLOR_RED,COLOR_YELLOW); init_pair(3,COLOR_CYAN,COLOR_GREEN); getmaxyx(stdscr,maxy,maxx); /* create windows - remember to check for errors! */ grandpa = newwin(maxy-4,maxx-10,2,5); father = subwin(grandpa,maxy-8,maxx-20,4,10); boy = subwin(father,maxy-16,maxx-40,8,20); /* color windows and splash some text */ wbkgd(grandpa,COLOR_PAIR(1)); waddstr(grandpa, Grandpa ); wbkgd(father,COLOR_PAIR(2)); waddstr(father, Father ); wbkgd(boy,COLOR_PAIR(3)); waddstr(boy, Boy ); wrefresh(grandpa);