NCurses Library Reference in Java

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Appendix A
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NCurses Library Reference
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Return Value
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Upon success, a pointer is returned, which is saved in a WINDOW variable declared just as regular windows are declared. On failure, NULL is returned. (See NULL.)
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Notes
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You shouldn t really think of a subwindow as a real window. In fact, if you need a real window, use newwin() or any of the window creation functions, to make a new window. The features available to real windows over subwindows are far more rich and versatile. Subwindows are best put to use as a way to access a specific rectangle within a window. For example, you can apply a unique background to the subwindow or use its coordinates as handy offsets that would require more overhead to calculate otherwise. 9 has more details. Subwindows can have their own subwindows. Remember that the begin_y and begin_x coordinates for the subwindow s origin are relative to the standard screen, not the parent window. As with a real window, a subwindow cannot be larger than the standard screen, nor can any part of the window be off the screen. The smallest subwindow is one character by one character. All commands that deal with windows also apply to subwindows. Though: A refresh() call to the parent window is all that s needed to initially display both the parent and any subwindow(s). After that, however, calls to wrefresh() are required to update a subwindow. Subwindows do not have their own window data in memory. Instead, they share memory with their parents. This leads to many drawbacks, among them: It s possible for the parent window to overwrite text in a subwindow; and the subwindow must be deleted before removing the parent window. (See delwin().)
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Examples
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footnote = subwin(stdscr,2,COLS,LINES-2,0);
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The statement creates a subwindow named footnote in the standard screen. The window occupies the bottom two rows of the screen from the left to right sides of the standard screen window. (See COLS, LINES.)
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menu_edit = subwin(menubar,12,20,2,43);
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Appendix A
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NCurses Library Reference
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Here, the subwindow menu_edit is created in the window menubar. menu_edit is 12 rows by 20 columns and its upper-left corner is at row 2, column 23, which are screen coordinates and not offsets within the window menubar.
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Sample Program
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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 23 24 25 26 27 28 29 30 31 #include <ncurses.h> int main(void) { WINDOW *sonny; initscr(); start_color(); init_pair(1,COLOR_WHITE,COLOR_BLUE); init_pair(2,COLOR_RED,COLOR_YELLOW); /* create subwindow */ sonny = subwin(stdscr,14,50,10,30); if(sonny == NULL) { endwin(); puts( Unable to create subwindow\n ); return(1); } /* color windows and splash some text */ bkgd(COLOR_PAIR(1)); addstr( Hello, son. ); wbkgd(sonny,COLOR_PAIR(2)); waddstr(sonny, Hello, Dad. ); refresh(); getch(); endwin(); return 0; }
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The sample output is shown in Figure A-2.
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Also See
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9, newwin(), derwin(), delwin(), WINDOW
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Appendix A
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NCurses Library Reference
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syncok()
The syncok() function directs NCurses to automatically (or not) touch parents of a subwindow when that subwindow s contents are changed.
Man Page Format
int syncok(WINDOW *win, bool bf);
Format Reference
win is a WINDOW variable representing a subwindow. bf is a Boolean value, either TRUE to touch the subwindows for updating and FALSE not to.
Return Value
OK on success, ERR on failure (though it could be any value other than ERR on success).
Notes
The syncok() attribute is tied into a specific window; it is not a global attribute in NCurses. Subwindows are created with the syncok() attribute disabled (set to FALSE). Seeing as how a subwindow and its parent window share memory, the purpose of this function seems questionable.
Example
syncok(subby,TRUE);
The statement causes any changes to the window subby to automatically be touched in all parent windows. Then again, because the memory is shared, the information is updated regardless.
Sample Program
Not applicable.
Also See
wsyncup(), subwin()
Appendix A
NCurses Library Reference
TABSIZE
NCurses uses the value of TABSIZE to set the position of tab stops on the screen. These stops are used when the \t, or tab, character is displayed; the cursor is advanced on the current line to the location of the next tab stop.