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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Not applicable.
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Notes
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Obviously, it s preferable to change attributes by using the proper NCurses functions wherever possible. The subwindow information for a window, win->_parx, win->_pary, win->_parent, is set only when the window is a subwindow. Note that there is no reference in the WINDOW structure for any subwindows. True, subwindows do link back to their parents (via the _parent element). But there is no element in the WINDOW structure to reference any offspring. (NCurses does maintain an internal list of all windows.)
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Examples
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if(win->_flags & _FULLWIN)
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The if test is true if the _FULLWIN bit is set for the window win, meaning that window win is full screen.
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if(sub->_parent == stdscr)
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The if condition is true when the standard screen has a subwindow named sub.
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Sample Program
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Also See
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getyx(), getmaxyx(), getbegyx(), attrset(), bkgd(), notimeout(), clearok(), leaveok(), scrollok(), idlok(), idcok(), immedok(), syncok(), keypad(), nodelay(), timeout(), setscrreg(), getparyx(), prefresh()
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wnoutrefresh()
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The wnoutrefresh() function copies modified (touched) text from a window to the virtual screen.
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Appendix A
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NCurses Library Reference
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Explanation
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The refresh operation in NCurses consists of two parts:
First, NCurses takes those portions of a window that have been changed or touched and writes those portions from the window data structure to a virtual screen in memory. Second, the contents of the virtual screen touched since the last refresh are displayed on the terminal.
The copying of information from a window data structure to the virtual screen is carried out by the wnoutrefresh() function. The updating of the virtual screen to the terminal is handled by another function, doupdate(). Together they form the two components of a refresh() or wrefresh() call. The advantage of using wnoutrefresh() comes when updating multiple windows. In that case, repeated calls to wnoutrefresh() followed by a single doupdate() call is more efficient than a series of wrefresh() calls, plus it results in less flicker.
Man Page Format
int wnoutrefresh(WINDOW *win);
Format Reference
win represents the window to update on the virtual screen. It s a WINDOW variable, representing a window created earlier in the code or stdscr for the standard screen.
Return Value
ERR upon failure, OK (or some value other than ERR) upon success.
Notes
wnoutrefresh() has the effect of un-touching a window. See touchwin(). A similar function, pnoutrefresh(), exists for help in updating pads. See pnoutrefresh(). The slk_noutrefresh() function is used for help in updating soft labels. See slk_noutrefresh().
Appendix A
NCurses Library Reference
Examples
wnoutrefresh(alpha); wnoutrefresh(beta); wnoutrefresh(gamma); doupdate();
The three wnoutrefresh() functions update information from the three windows, alpha, beta, and gamma. Then final doupdate() function updates the terminal. These four statements are more efficient than three corresponding wrefresh() functions.
wnoutrefresh(stdscr);
Here, the standard screen is updated to the virtual screen. A subsequent call to doupdate() will update the terminal screen.
Sample Program
Refer to the entries for doupdate() and mvwin() for sample programs and output.
Also See
refresh(), doupdate(), wredrawln(), touchwin()
wredrawln()
The wredrawln() function directs NCurses to update specific lines from a window to the terminal.
Explanation
This function, along with redrawwin(), operates under the assumption that something has disrupted a program s text on the terminal. In that instance, NCurses may not recognize the corrupted screen or know that its internal representation of the screen (curscr) is out of sync. The wredrawln() function allows a program to fix one or more lines in a window, forcing NCurses to write those lines and make the curscr once again match what the user sees.
Man Page Format
int wredrawln(WINDOW *win, int beg_line, int num_lines);
Appendix A
NCurses Library Reference
Format Reference
win is a WINDOW variable representing a window on the screen. beg_line is an int value specifying a line on the screen to update. Values range from 0 for the top line, down to as many rows are between beg_line and the bottom of the window. num_lines is the number of rows to update, from 1 through as many rows are available between beg_line and the bottom of the window.
Return Value
ERR upon failure or some value other than ERR upon success, usually OK but not always.
Notes
wredrawln() does not actually refresh the screen. The next wrefresh() command merely ensures that the lines touched by wredrawln() are fully updated on the terminal screen. The lines wredrawln() replaces are completely replaced. The redrawwin() function is used to force a re-write of the entire screen. It s equivalent to wredrawln(win,0,n), where win is the name of the window and n is the window s bottom row. I ve yet to see this function work as described. Though it appears to do something, just not what is advertised. A better solution is to use the following as a replacement for wredrawln():
touchwin(stdscr); touchwin(curscr); wrefresh(curscr);