Explanation in Java

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Explanation
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Normally, the refresh() function merely updates those parts of the window that have been changed. But by switching on clearok(), a complete erasure and rewrite of the window is possible.
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Man Page Format
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int clearok(WINDOW *win, bool bf);
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Format Reference
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win is the name of the window to erase and redraw. stdscr can be used for win to update the standard screen. bf is a Boolean value, either TRUE or FALSE. TRUE is used to activate erasing/redrawing for the named window; FALSE turns it off.
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Return Value
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The function always returns OK.
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Appendix A
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NCurses Library Reference
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Notes
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The screen isn t actually erased and redrawn until a refresh() or wrefresh() function is used. When the current screen, curscr, is used as the win argument, NCurses erases and redraws the entire screen from scratch at the next refresh(). Apparently erasing and redrawing the entire screen is visually distracting, but this must only be so with slower terminal speeds. (Refer to baudrate().)
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clearok(stdscr,TRUE);
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The statement causes the next call to refresh() to erase and redraw the standard screen, ensuring that what s shown in the screen matches memory.
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clearok(menu,FALSE);
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Here, clearok() updating is disabled for the window menu. Any subsequent calls to refresh() update only changed parts of the screen.
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clearok(curscr,TRUE);
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After executing this statement, the next call to wrefresh() forces the standard screen to be cleared and then redrawn from scratch.
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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 #include <ncurses.h> int main(void) { int x; initscr(); for(x=0;x<350;x++) printw( -0- ); refresh(); getch(); /* fills screen with junk */
mvaddstr(5,20, Holy updates, Batman! ); clearok(stdscr,TRUE); refresh(); getch(); endwin(); return 0; }
Appendix A
NCurses Library Reference
Sample output: The screen is partially filled with a pattern. Press Enter and a new string of text is written to the screen, the screen is then erased and redrawn. (This can happen so fast that the visual effect isn t noticed.)
Also See
clear(), TRUE, refresh(), touchwin()
clrtobot()
The clrtobot() function clears the screen from the cursor s current position to the end of the line (right) and to the bottom of the screen.
Man Page Formats
int clrtobot(void); int wclrtobot(WINDOW *win);
Format Reference
The clrtobot() function has no arguments. Refer to the w prefix entry later in this appendix for information on the win argument.
Return Value
The function returns OK.
Notes
The function does not move the cursor. Any text attributes are erased by this function. Remember that the text doesn t visually go away until you refresh() the window.
Example
clrtobot();
After this statement, text is cleared from the cursor s position to the right, all the way to the end of the line, and then all rows below to the bottom of the window.
Appendix A
NCurses Library Reference
Sample Program
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) { int c,y,x,cmax; initscr(); getmaxyx(stdscr,y,x); cmax = (x * y) / 5; for(c=0;c<cmax;c++) addstr( blah ); refresh(); getch(); move(5,20); clrtobot(); refresh(); getch(); endwin(); return 0; } /* Setup the cursor */ /* Clear to end of screen */
Sample output: The screen is filled with the text blah blah blah. Pressing the Enter key clears the screen from cursor location 5,20 to the end of the screen.
Also See
6, clear(), clrtoeol(), refresh()
clrtoeol()
The clrtoeol() function clears text from the cursor s current position to the end of the line.
Man Page Formats
int clrtoeol(void); int wclrtoeol(WINDOW *win);
Format Reference
The clrtoeol() function has no arguments.
Appendix A
NCurses Library Reference
Refer to the w prefix entry later in this appendix for information on the win argument.
Return Value
The function returns OK.
Notes
Refer to the Notes for clrtobot().
Example
wclrtoeol(inputwin);
After this statement, text is cleared from the cursor s position to the right, all the way to the end of the line, in the window inputwin.
Sample Program
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) { int c,y,x,cmax; initscr(); getmaxyx(stdscr,y,x); cmax = (x * y) / 5; for(c=0;c<cmax;c++) addstr( blah ); refresh(); getch(); move(5,20); clrtoeol(); refresh(); getch(); endwin(); return 0; } /* Setup the cursor */ /* Clear to end of line */
Sample output: The screen is filled with the text blah blah blah. Pressing the Enter key clears the screen from cursor location 5,20 to the end of the line.