Return Value in Java

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All the mv-prefixed functions shown earlier return either OK or ERR. Normally, these values aren t checked; however, it s a good idea to check them with the mv-prefixed functions especially when there is a possibility that a character would be placed outside a window s boundary. OK and ERR are defined in NCURSES.H.
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Notes
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The functions mvwin() and mvderwin() are not mv-prefix functions. While the mv prefix functions save typing, using them is not more efficient nor saves any time over using the separate move() function before an output function.
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Also See
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addch(), addchstr(), addstr(), and so on
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Appendix A
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NCurses Library Reference
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mvderwin()
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The mvderwin() function uses a subwindow to display a different portion of the parent window. It does not really move anything other than data.
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Explanation
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Subwindows share memory with their parent. Therefore, moving a subwindow doesn t really do anything. Instead, what this function does is allow you to display a different portion of the parent window in the subwindow rectangle.
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int mvderwin(WINDOW *win, int par_y, int par_x);
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win is the name of a WINDOW variable representing a subwindow. par_y is an int value representing the row value of a coordinate in the parent window. par_x is an int value representing the column value of a coordinate in the parent window.
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Return Value
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OK on success or ERR upon failure.
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The mvderwin() function takes a rectangle of text from the parent window at location par_y, par_x, with the same width and depth as the subwindow, as copies that text into the subwindow s location. This function also copies any text attributes from the source location in the parent window to the subwindow, overwriting any attributes already in the subwindow. mvderwin() updates a window inside a subwindow in much the same manner as prefresh() updates a portion of a pad inside a window. See prefresh(). This function works on all subwindows, whether they were created by the subwin() or derwin() functions. The mvwin() function is used to move a window. It should not be used on a subwindow.
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Appendix A
NCurses Library Reference
According to popular lore on the Internet, The subwindow functions are flaky, incompletely implemented, and not well tested.
Example
mvderwin(sub,5,10);
Here, the statement copies text from location row 5, column 10 in the parent window and places it into the subwindow sub. The width and depth of the information copied is equal in size to the subwindow.
Sample Program
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 #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); sonny = subwin(stdscr,5,20,10,30); bkgd(COLOR_PAIR(1)); addstr( Hello, son. ); wbkgd(sonny,COLOR_PAIR(2)); waddstr(sonny, Hello, Dad! ); refresh(); getch(); mvderwin(sonny,0,0); wbkgd(sonny,COLOR_PAIR(2)); wrefresh(sonny); getch(sonny); endwin(); return 0; }
Sample output: A yellow subwindow is created with the text Hello, Dad! Press Enter and the text Hello, son. is copied from the upper-right corner of the parent into the subwindow via mvderwin().
Appendix A
NCurses Library Reference
Also See
mvwin(), prefresh(), subwin(), derwin()
mvw prefix functions
A host of NCurses text output functions come prefixed by mvw. This combines the mv and w prefixes, allowing text to be placed at a specific position within a specific window.
Format
The mvw prefix functions feature win, y, and x as their first arguments. win is a WINDOW variable, representing a window created earlier in the program. Refer to the W Prefix entry later in this appendix for more details. y and x represent the cursor s position on the screen. They are int values for the row and column, ranging from 0 to the height and width of the window, respectively. Refer to the individual functions elsewhere in this appendix for information on the other arguments in the various mvw prefix functions.
Notes
Note that win always comes first, even though mv comes first in the mvw prefix. The mvwin() function is not an mvw-prefix function.