Return Value in Java

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Return Value
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ERR upon failure and an int value other than ERR upon success.
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Notes
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Remember that touchline() requires three arguments: window, starting line, and count. It s really a touch lines function. touchline() updates lines from the named row down. A common reason for using touchline() is when NCurses is having trouble updating the current screen, such as when one window overlaps another. The touchline() function by itself does not update the screen. It merely coordinates between the named window and memory. A refresh() or wrefresh() function is required after touchline() to actually see the updated window. If you know specifically which lines of text need updating, then the touchline() function is more efficient than calling touchwin().
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Examples
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touchline(stdscr,0,10);
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Here, the top 10 lines of the standard screen are touched, meaning that each and every character will be updated on the next refresh() call.
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Appendix A
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NCurses Library Reference
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touchline(menu,10,0);
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Here, the touchline() function flags line 10 in the window menu for updating with the next wrefresh(menu) call.
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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 32 33 34 35 36 37 38 39 40 41 42 43 #include <Ncurses.h> #include <stdlib.h> #include <time.h> #define MAX 23 int main(void) { WINDOW *alpha; int rows[MAX]; int c,r,total; srandom((unsigned)time(NULL)); /* seed randomizer */ for(c=0;c<MAX;c++) /* initialize array */ rows[c] = 0; total = 0; /* initialize counter */ /* NCurses setup stuff */ initscr(); start_color(); init_pair(1,COLOR_WHITE,COLOR_BLUE); alpha = newwin(0,0,0,0); wbkgd(alpha,COLOR_PAIR(1)); untouchwin(alpha); /* pretend win is updated */ addstr( Press Enter to touch and display window alpha\n ); refresh(); getch(); /* Loop to gradually reveal the blue window */ while(total<MAX) { r = random() % (MAX + 1); if( rows[r]==0 ) { rows[r] = 1; touchline(alpha,r,1); wrefresh(alpha); /* update the line */ napms(100); /* pause 1/10 sec */ total++; } } getch();
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Appendix A
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44 45 46 47
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NCurses Library Reference
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endwin(); return 0; }
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Sample output:
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Press Enter to touch and display window alpha
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After pressing enter, each row of window alpha is updated one after the other as each is touched. Eventually the entire screen turns blue.
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Also See
refresh(), touchwin(), wtouchln(), is_linetouched()
touchwin()
The touchwin() function directs NCurses to treat a window as if every character on the window has been changed or modified since the last refresh, forcing NCurses to redraw the entire window on the next refresh() or wrefresh() function.
Explanation
Internally, NCurses keeps track of which parts of a window have been updated since the last refresh. For efficiency s sake, only those changed parts of the window are then updated to the current screen on the next refresh. By using touchwin(), every single character in the window is flagged as touched, or changed, forcing NCurses to redraw everything from scratch on the next refresh() or wrefresh() call.
Man Page Format
int touchwin(WINDOW *win);
Format Reference
touchwin(win)
win is the name of a window to touch. After the call, all locations in the window are flagged as requiring updating for the next call to wrefresh(win).
Appendix A
NCurses Library Reference
Return Value
ERR upon failure, or a value other than ERR upon success.
Notes
It s only necessary to use touchwin() when NCurses is having trouble updating the current screen. This happens most often when dealing with overlapping windows. By itself, touchwin() does not redisplay the current screen or the named window; it merely updates the window s contents. To update the current screen, you must call wrefresh() for the window after using the touchwin() function. Using touchwin() followed by wrefresh() is similar to using the clearok() function for that window, followed by wrefresh(). Though remember that the clearok() function clears the screen before redrawing the image, and it does not change a window s status from touched to untouched.
Example
touchwin(help);
Here, the touchwin() function assures that all parts of the window help will be drawn for the next call to wrefresh(help).