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Explanation
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NCurses keeps track of which portions of a window have been changed since the last refresh(). The is_linetouched() function determines whether or not any text on a given line (row) of text has been modified since that refresh(). If so, the function returns TRUE, FALSE otherwise.
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Man Page Format
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bool is_linetouched(WINDOW *win, int line);
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Appendix A
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NCurses Library Reference
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win is an NCurses window, either stdscr for the standard screen or the name of a WINDOW variable returned from a function that creates new windows. line is an int value indicating which row (line) to check for updates. Values range from 0 for the top row to the maximum rows in a window.
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Return Value
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The value returned by is_linetouched() is one of the following constants declared in NCURSES.H:
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TRUE, indicating that the line has been modified since the last refresh() FALSE, indicating that the line and the current screen match up (or should match up as far as NCurses is concerned) ERR, which happens when an invalid line number is specified
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Notes
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The is_linetouched() function is merely a tool you can use to determine whether or not a row of text has been updated since the last refresh(). Using the is_linetouched() function does not force NCurses to update the screen but rather indicates which line will be updated on the next refresh. is_linetouched() works best after a recent refresh. For example, when a window is just created, or initscr() has created the standard screen, then effectively all lines in the window are touched. Only after issuing a recent refresh() does the is_linetouched() function become truly useful. The is_linetouched() function always returns TRUE after the touchline() function is used. See touchline().
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Example
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if(is_linetouched(alpha,0));
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Here, the if test passes when modifications have been made to line 0 in window alpha.
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1 2 3 4 #include <ncurses.h> int main(void) {
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Appendix A
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NCurses Library Reference
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5 WINDOW *hide; 6 int row; 7 8 initscr(); 9 hide = newwin(0,0,0,0); 10 11 refresh(); /* Initial write of the standard ; screen */ 12 waddstr(hide, Changes are being made to the standard ; screen\n ); 13 mvaddstr(3,5, Change! ); 14 mvaddstr(10,60, Change! ); 15 mvaddstr(20,40, Change! ); 16 waddstr(hide, Press Enter to see which rows have been ; changed:\n ); 17 wrefresh(hide); 18 getch(); 19 20 for(row=0;row<LINES;row++) 21 { 22 if(is_linetouched(stdscr,row)) 23 wprintw(hide, Line %d has been updated.\n ,row); 24 } 25 wrefresh(hide); 26 getch(); 27 28 endwin(); 29 return 0; 30 }
Sample output:
Changes are being made to the standard screen Press Enter to see which rows have been changed: Line 3 has been updated. Line 10 has been updated. Line 20 has been updated.
Also See
touchline(), wtouchln(), is_wintouched(), refresh()
is_wintouched()
The is_wintouched() function helps determine whether any part of a window has been changed or updated since the last refresh().
Appendix A
NCurses Library Reference
Man Page Format
bool is_wintouched(WINDOW *win);
Format Reference
win is the name of the window to examine.
Return Value
The function returns TRUE when the window has been changed, FALSE otherwise. TRUE and FALSE are defined in NCURSES.H.
Notes
A window is considered touched immediately after it s created or, in the case of stdscr, immediately after the initscr() function. On such a new window, the is_wintouched() function always returns TRUE. Therefore, it s best to use is_wintouched() after a refresh() or wrefresh() call is made for a specific window. is_wintouched() always returns TRUE after the touchwin() function is used. See touchwin(). The is_wintouched() function does not force NCurses to update a window on the next call to refresh(). Instead, is_wintouched() is merely a tool you can use to determine whether or not a window has been modified since the last refresh or whether a refresh for a particular window is really necessary.
Example
if(is_wintouched(stdscr));
This if test is true when the standard screen has been updated since the last call to refresh().
Sample Program
1 2 3 4 5 6 7 8 9 #include <ncurses.h> int main(void) { WINDOW *fred; initscr(); fred = newwin(0,0,0,0);