diff options
Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/lib/libcurses.tex | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/Doc/lib/libcurses.tex b/Doc/lib/libcurses.tex new file mode 100644 index 0000000..0f93515 --- /dev/null +++ b/Doc/lib/libcurses.tex @@ -0,0 +1,394 @@ +\section{\module{curses} --- + Terminal independant console handling} + +\declaremodule{extension}{curses} +\sectionauthor{Moshe Zadka}{mzadka@geocities.com} +\modulesynopsis{An interface to the curses library.} + +The \module{curses} module provides an interface to the curses \UNIX{} +library, the de-facto standard for portable advanced terminal +handling. + +While curses is most widely used in the \UNIX{} environment, versions +are available for DOS, OS/2, and possibly other systems as well. The +extension module has not been tested with all available versions of +curses. + +\begin{seealso} + \seetext{Tutorial material on using curses with Python is available + on the Python Web site as Andrew Kuchling's \emph{Curses + Programming with Python}, at + \url{http://www.python.org/doc/howto/curses/curses.html}.} +\end{seealso} + + +\subsection{Constants and Functions \label{curses-functions}} + +The \module{curses} module defines the following data members: + +\begin{datadesc}{version} +A string representing the current version of the module. +\end{datadesc} + +\begin{datadesc}{A_NORMAL} +Normal attribute. +\end{datadesc} + +\begin{datadesc}{A_STANDOUT} +Standout mode. +\end{datadesc} + +\begin{datadesc}{A_UNDERLINE} +Underline mode. +\end{datadesc} + +\begin{datadesc}{A_BLINK} +Blink mode. +\end{datadesc} + +\begin{datadesc}{A_DIM} +Dim mode. +\end{datadesc} + +\begin{datadesc}{A_BOLD} +Bold mode. +\end{datadesc} + +\begin{datadesc}{A_ALTCHARSET} +Alternate character set mode. +\end{datadesc} + +\begin{datadesc}{KEY_*} +Names for various keys. The exact names available are system dependant. +\end{datadesc} + +\begin{datadesc}{ACS_*} +Names for various characters: +\constant{ACS_ULCORNER}, \constant{ACS_LLCORNER}, +\constant{ACS_URCORNER}, \constant{ACS_LRCORNER}, \constant{ACS_RTEE}, +\constant{ACS_LTEE}, \constant{ACS_BTEE}, \constant{ACS_TTEE}, +\constant{ACS_HLINE}, \constant{ACS_VLINE}, \constant{ACS_PLUS}, +\constant{ACS_S1}, \constant{ACS_S9}, \constant{ACS_DIAMOND}, +\constant{ACS_CKBOARD}, \constant{ACS_DEGREE}, \constant{ACS_PLMINUS}, +\constant{ACS_BULLET}, \constant{ACS_LARROW}, \constant{ACS_RARROW}, +\constant{ACS_DARROW}. + +\strong{Note:} These are available only after \function{initscr()} has +been called. +\end{datadesc} + +The module \module{curses} defines the following exception: +\begin{excdesc}{error} +Curses function returned an error status. +\end{excdesc} + +The module \module{curses} defines the following functions: + +\begin{funcdesc}{initscr}{} +Initialize the library. Returns a \class{WindowObject} which represents +the whole screen. +\end{funcdesc} + +\begin{funcdesc}{endwin}{} +De-initialize the library, and return terminal to normal status. +\end{funcdesc} + +\begin{funcdesc}{isendwin}{} +Returns true if \function{endwin()} has been called. +\end{funcdesc} + +\begin{funcdesc}{doupdate}{} +Update the screen. +\end{funcdesc} + +\begin{funcdesc}{newwin}{\optional{nlines, ncols,} begin_y, begin_x} +Return a new window, whose left-upper corner is at +\code{(\var{begin_y}, \var{begin_x})}, and whose height/width is +\var{nlines}/\var{ncols}. By default, the window will extend from the +specified position to the lower right corner of the screen. +\end{funcdesc} + +\begin{funcdesc}{beep}{} +Emit a short sound. +\end{funcdesc} + +\begin{funcdesc}{flash}{} +Flash the screen. +\end{funcdesc} + +\begin{funcdesc}{ungetch}{ch} +Push \var{ch} so the next \method{getch()} will return it; \var{ch} is +an integer specifying the character to be pushed. +\strong{Note:} only one \var{ch} can be pushed before \method{getch()} +is called. +\end{funcdesc} + +\begin{funcdesc}{flushinp}{} +Flush all input buffers. +\end{funcdesc} + +\begin{funcdesc}{cbreak}{} +Enter cbreak mode. +\end{funcdesc} + +\begin{funcdesc}{nocbreak}{} +Leave cbreak mode. +\end{funcdesc} + +\begin{funcdesc}{echo}{} +Enter echo mode. +\end{funcdesc} + +\begin{funcdesc}{noecho}{} +Leave echo mode. +\end{funcdesc} + +\begin{funcdesc}{nl}{} +Enter nl mode. +\end{funcdesc} + +\begin{funcdesc}{nonl}{} +Leave nl mode. +\end{funcdesc} + +\begin{funcdesc}{raw}{} +Enter raw mode. +\end{funcdesc} + +\begin{funcdesc}{noraw}{} +Leave raw mode. +\end{funcdesc} + +\begin{funcdesc}{meta}{yes} +If \var{yes} is 1, allow 8-bit characters. If \var{yes} is 0, +allow only 7-bit chars. +\end{funcdesc} + +\begin{funcdesc}{keyname}{k} +Return the name of the key numbered \var{k}. +\end{funcdesc} + + +\subsection{Window Objects \label{curses-window-objects}} + +Window objects, as returned by \function{initscr()} and +\function{newwin()} above, have the +following methods: + +\begin{methoddesc}{refresh}{} +Do refresh (sync actual screen with previous drawing/deleting +methods.) +\end{methoddesc} + +\begin{methoddesc}{nooutrefresh}{} +Mark for refresh but wait. +\end{methoddesc} + +\begin{methoddesc}{mvwin}{new_y, new_x} +Move the window so its upper-left corner is at \code{(new_y, new_x)}. +\end{methoddesc} + +\begin{methoddesc}{move}{new_y, new_x} +Move cursor to \code{(\var{new_y}, \var{new_x})}. +\end{methoddesc} + +\begin{methoddesc}{subwin}{nlines=HEIGTH-begin_y, ncols=WIDTH-begin_x, + begin_y, begin_y} +Return a sub-window, whose upper-left corner is at +\code{(\var{begin_y}, \var{begin_x})}, and whose width/height is +\var{ncols}/\var{nlines}. +\end{methoddesc} + +\begin{methoddesc}{addch}{\optional{y, x,} ch\optional{, attr}} +\strong{Note:} A \emph{character} means a C character (i.e., an +\ASCII{} code), rather then a Python character (a string of length 1). +(This note is true whenever the documentation mentions a character.) + +Paint character \var{ch} at \code{(\var{y}, \var{x})} with attributes +\var{attr}, overwriting any character previously painter at that +location. By default, the character position and attributes are the +current settings for the window object. +\end{methoddesc} + +\begin{methoddesc}{insch}{\optional{y, x,} ch\optional{, attr}} +Paint character \var{ch} at \code{(\var{y}, \var{x})} with attributes +\var{attr}, moving the line from position \var{x} right by one +character. +\end{methoddesc} + +\begin{methoddesc}{delch}{\optional{x, y}} +Delete any character at \code{(y,x)}. +\end{methoddesc} + +\begin{methoddesc}{echochar}{ch\optional{, attr}} +Add character \var{ch} with attribute \var{attr}, and immediately +call \method{refresh}. +\end{methoddesc} + +\begin{methoddesc}{addstr}{\optional{y, x,} str\optional{, attr}} +Paint string \var{str} at \code{(y,x)} with attributes \var{attr}, overwriting +anything previously on the display. +\end{methoddesc} + +\begin{methoddesc}{attron}{attr} +Turn on attribute \var{attr} at current cursor location. +\end{methoddesc} + +\begin{methoddesc}{attroff}{attr} +Turn off attribute \var{attr} at current cursor location. +\end{methoddesc} + +\begin{methoddesc}{setattr}{attr} +Set the attributes at the current cursor location to \var{attr}. +\end{methoddesc} + +\begin{methoddesc}{standend}{} +Turn off all attributes at current cusor location. +\end{methoddesc} + +\begin{methoddesc}{standout}{} +Turn on attribute \var{A_STANDOUT}. +\end{methoddesc} + +\begin{methoddesc}{border}{ls\code{ = ACS_VLINE}, rs\code{ = ACS_VLINE}, + ts\code{ = ACS_HLINE}, bs\code{ = ACS_HLINE}, + tl\code{ = ACS_ULCORNER}, tr\code{ = ACS_URCORNER}, + bl\code{ = ACS_BLCORNER}, br\code{ = ACS_BRCORNER}} +Draw a border around the edges of the window. The arguments are +respectively, the character to use for the left side, the right side +the top side, the bottom side, the top-left corner, the top-right +corner, the bottom-left corner and the bottom-right corner. +\end{methoddesc} + +\begin{methoddesc}{box}{vertch\code{ = ACS_VLINE}, horch\code{ = ACS_HLINE}} +Same as \method{border}, but both \var{ls} and \var{rs} are \var{vertch} +and both \var{ts} and {bs} are \var{horch}. The corners are non-overridable +by this function. +\end{methoddesc} + +\begin{methoddesc}{hline}{\optional{y, x,} ch, n} +Display a horizontal line starting at \code{(\var{y}, \var{x})} with +length \var{n} consisting of the character \var{ch}. +\end{methoddesc} + +\begin{methoddesc}{vline}{\optional{y, x,} ch, n} +Display a vertical line starting at \code{(\var{y}, \var{x})} with +length \var{n} consisting of the character \var{ch}. +\end{methoddesc} + +\begin{methoddesc}{erase}{} +Clear the screen. +\end{methoddesc} + +\begin{methoddesc}{deletln}{} +Delete the line under the cursor. All following lines are moved up +by 1 line. +\end{methoddesc} + +\begin{methoddesc}{insertln}{} +Insert a blank line under the cursor. All following lines are moved +down by 1 line. +\end{methoddesc} + +\begin{methoddesc}{getyx}{} +Return a tuple \code{(\var{y}, \var{x})} of current cursor position. +\end{methoddesc} + +\begin{methoddesc}{getbegyx}{} +Return a tuple \code{(\var{y}, \var{x})} of co-ordinates of upper-left +corner. +\end{methoddesc} + +\begin{methoddesc}{getmaxyx}{} +Return a tuple \code{(\var{y}, \var{x})} of the height and width of +the window. +\end{methoddesc} + +\begin{methoddesc}{clear}{} +Like \method{erase()}, but also causes the whole screen to be repainted +upon next call to \method{refresh()}. +\end{methoddesc} + +\begin{methoddesc}{clrtobot}{} +Erase from cursor to the end of the screen: all lines below the cursor +are deleted, and then the equivalent of \method{clrtoeol()} is performed. +\end{methoddesc} + +\begin{methoddesc}{clrtoeol}{} +Erase from cursor to the end of the line. +\end{methoddesc} + +\begin{methoddesc}{scroll}{\optional{lines\code{ = 1}}} +Scroll the screen upward by \var{lines} lines. +\end{methoddesc} + +\begin{methoddesc}{touchwin}{} +Pretend the whole window has been changed, for purposes of drawing +optimizations. +\end{methoddesc} + +\begin{methoddesc}{touchline}{start, count} +Pretend \var{count} lines have been changed, starting with line +\var{start}. +\end{methoddesc} + +\begin{methoddesc}{getch}{\optional{x, y}} +Get a character. Note that the integer returned does \emph{not} have to +be in \ASCII{} range: function keys, keypad keys and so on return numbers +higher then 256. In no-delay mode, an exception is raised if there is +no input. +\end{methoddesc} + +\begin{methoddesc}{getstr}{\optional{x, y}} +Read a string from the user, with primitive line editing capacity. +\end{methoddesc} + +\begin{methoddesc}{inch}{\optional{x, y}} +Return the character at the given position in the window. The bottom +8 bits are the character proper, and upper bits are the attributes. +\end{methoddesc} + +\begin{methoddesc}{clearok}{yes} +If \var{yes} is 1, the next call to \method{refresh()} +will clear the screen completely. +\end{methoddesc} + +\begin{methoddesc}{idlok}{yes} +If called with \var{yes} equal to 1, \module{curses} will try and use +hardware line editing facilities. Otherwise, line insertion/deletion +are disabled. +\end{methoddesc} + +\begin{methoddesc}{leaveok}{yes} +If \var{yes} is 1, +cursor is left where it is, instead of being at ``cursor position.'' +This reduces cursor movement where possible. If possible it will be made +invisible. + +If \var{yes} is 0, cursor will always be at +``cursor position'' after an update. +\end{methoddesc} + +\begin{methoddesc}{setscrreg}{top, bottom} +Set the scrolling region from line \var{top} to line \var{bottom}. All +scrolling actions will take place in this region. +\end{methoddesc} + +\begin{methoddesc}{keypad}{yes} +If \var{yes} is 1, escape sequences generated by some keys (keypad, +function keys) will be interpreted by \module{curses}. + +If \var{yes} is 0, escape sequences will be left as is in the input +stream. +\end{methoddesc} + +\begin{methoddesc}{nodelay}{yes} +If \var{yes} is 1, \method{getch()} will be non-blocking. +\end{methoddesc} + +\begin{methoddesc}{notimeout}{yes} +If \var{yes} is 1, escape sequences will not be timed out. + +If \var{yes} is 0, after a few milliseconds, an escape sequence will +not be interpreted, and will be left in the input stream as is. +\end{methoddesc} |