NCurses Library Reference in Java

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Appendix A
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NCurses Library Reference
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Multiple attributes can be specified in a single attron() function by separating each with a | (logical OR). COLOR_PAIR(n) is also considered a text attribute, where n is a color pair number defined by an init_pair() function earlier in the program. NULL is used in the attr_on() functions as a placeholder for the undefined opts value. Refer to the w prefix entry later in this appendix for information on the win argument.
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Return Value
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The return value is stated as not important according to the documentation.
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Notes
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The new attributes are applied only to new text displayed after the attron() function. These attributes are in addition to any set by previous attron() or attrset() functions. Applying a new COLOR_PAIR value with attron() replaces any previously defined text colors with the new colors. Only one COLOR_PAIR can be used at a time; COLOR_PAIR attributes cannot be combined, as other attributes can. Attributes affect the output of the addch(), addstr(), and printw() functions. Also refer to the Notes for attrset().
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Examples
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attron(A_REVERSE);
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This statement applies the reverse text attribute from any new text displayed. This attribute is applied in addition to any previously-applied text attributes.
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wattron(warning,A_BOLD | A_BLINK);
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This statement sets both the bold and blink attributes from any new text displayed in the warning window.
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attron(COLOR_PAIR(3));
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This statement set the text displayed to the color assigned to COLOR_PAIR 3.
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Sample Program
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Refer to the entry for attrset() for a sample program.
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Appendix A
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NCurses Library Reference
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Also See
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3, Appendix C, attrset(), chgat()
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attrset()
The attrset() function sets attributes for all text output functions that follow. The text displayed after using attrset() ignores any attributes previously assigned by an attrset() or attron() function and instead uses the new attributes specified by attrset().
Man Page Formats
int int int int attrset(int attrs); wattrset(WINDOW *win, int attrs); attr_set(attr_t attrs, short pair, void *opts); wattr_set(WINDOW *win, attr_t attrs, short pair, void *opts);
Format Reference
attrs is a long int value representing one or more attribute constants. The attribute(s) affect text put to the screen after the attrset() command is used. The attributes defined in NCURSES.H are as follows: A_ALTCHARSET A_BLINK A_BOLD A_DIM A_INVIS A_NORMAL A_REVERSE A_STANDOUT A_UNDERLINE A_PROTECT A_HORIZONTAL A_LEFT A_LOW A_RIGHT A_TOP A_VERTICAL
pair is a short int value representing a color pair number, similar to the n used in COLOR_PAIR(n). NULL is used in the attr_set() functions as a placeholder the undefined opts value. Refer to the w prefix entry later in this appendix for information on the win argument.
Appendix A
NCurses Library Reference
Return Value
The return value is stated as not important according to the documentation.
Notes
Attributes set by attrset() can be removed by using the attroff() function. New attributes can be added by using the attron() function. attrset() is an in-line function; it affects only text displayed after attrset() is used. attrset() does not reset all text in a window at once. Attributes affect the output of the addch(), addstr(), and printw() functions. All text attributes can be turned off by using this statement:
attrset(A_NORMAL);
Both attron() and the attrset() functions are used to set text attributes. attron() always adds the text attribute(s) specified to whatever attributes exist already. attrset(), on the other hand, resets all text attributes to only those listed by the attrset() function. In NCurses, text attributes are combined with a character to produce the NCurses chtype. The attributes and character stay together; move or copy the character, and the attributes go with it. This is unlike other text attribute systems where the attribute is applied to the character s location on the screen and characters at that location take on the attributes of the location. In NCurses, characters and attributes are often the same thing. (Also see Appendix C.) Multiple attributes are applied by specifying each in the attrset() function, separated by a | (logical OR). This also includes using the COLOR_PAIR(n) attribute. It is technically possible that using a logical OR to combine attributes may not work. For example, if more than the maximum number of color pairs are defined (which can happen on some terminals, such as xterm-88color or xterm-256color), then using the logical OR may result in nonexistent attributes being assigned. (NCurses 5.5 can be compiled to support 32768 color pairs.) The attributes listed in this entry can also be combined with COLOR_PAIR(n) values, where n indicates a foreground (text) and background color combination, as defined by init_pair(). Not all the attributes listed in this entry are implemented on every terminal. For example, NCurses doesn t implement the A_TOP, A_LEFT, A_RIGHT, A_VERTICAL, or A_HORIZTIONAL attributes because there is no terminal that uses those features. Refer to the Format Reference section earlier to see which are available for you to use. attrset(A_NORMAL) turns off all attributes.