First round of curses documentation improvements; correct errors, flesh out
entry point descriptions.
This commit is contained in:
Eric S. Raymond
parent
46a733dfbf
commit
6899660a81
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@ -1,8 +1,9 @@
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\section{\module{curses} ---
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Terminal independent console handling}
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Screen painting and input handling for character-cell terminals}
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\declaremodule{extension}{curses}
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\sectionauthor{Moshe Zadka}{mzadka@geocities.com}
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\sectionauthor{Eric Raymond}{esr@thyrsus.com}
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\modulesynopsis{An interface to the curses library.}
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The \module{curses} module provides an interface to the curses \UNIX{}
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@ -10,14 +11,17 @@ library, the de-facto standard for portable advanced terminal
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handling.
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While curses is most widely used in the \UNIX{} environment, versions
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are available for DOS, OS/2, and possibly other systems as well. The
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extension module has not been tested with all available versions of
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curses.
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are available for DOS, OS/2, and possibly other systems as well. This
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extension module is designed to match the API of ncurses, an
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open-source curses library hosted on Linux and the BSD variants of
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Unix.
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\begin{seealso}
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\seemodule{curses.ascii}{Utilities for working with \ASCII{}
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characters, regardless of your locale
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settings.}
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\seemodule{curses.textbox}{Editable text widget for curses supporting
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Emacs-like bindings.}
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\seetext{Tutorial material on using curses with Python is available
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on the Python Web site as Andrew Kuchling's
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\citetitle[http://www.python.org/doc/howto/curses/curses.html]{Curses
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@ -40,11 +44,15 @@ Whenever \var{attr} is optional, it defaults to \constant{A_NORMAL}.
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The module \module{curses} defines the following functions:
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\begin{funcdesc}{baudrate}{}
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Returns the output speed of the terminal in bits per second.
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Returns the output speed of the terminal in bits per second. On
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software terminal emulators it will have a fixed high value.
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Included for historical reasons; in former times, it was used to
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write output loops for time delays and occasionally to change
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interfaces depending on the line speed.
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\end{funcdesc}
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\begin{funcdesc}{beep}{}
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Emit a short sound.
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Emit a short attention sound.
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\end{funcdesc}
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\begin{funcdesc}{can_change_color}{}
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@ -53,7 +61,12 @@ the colors displayed by the terminal.
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\end{funcdesc}
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\begin{funcdesc}{cbreak}{}
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Enter cbreak mode.
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Enter cbreak mode. In cbreak mode (sometimes called ``rare'' mode)
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normal tty line buffering is turned off and characters are available
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to be read one by one. However, unlike raw mode, special characters
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(interrupt, quit, suspend, and flow control) retain their effects on
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the tty driver and calling program. Calling first \function{raw()}
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then \function{cbreak()} leaves the terminal in cbreak mode.
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\end{funcdesc}
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\begin{funcdesc}{color_content}{color_number}
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@ -75,7 +88,8 @@ color. This attribute value can be combined with
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Sets the cursor state. \var{visibility} can be set to 0, 1, or 2, for
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invisible, normal, or very visible. If the terminal supports the
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visibility requested, the previous cursor state is returned;
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otherwise, an exception is raised.
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otherwise, an exception is raised. On many terminals, the ``visible''
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mode is an underline cursor and the ``very visible'' mode is a block cursor.
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\end{funcdesc}
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\begin{funcdesc}{def_prog_mode}{}
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@ -98,11 +112,24 @@ Inserts an \var{ms} millisecond pause in output.
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\end{funcdesc}
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\begin{funcdesc}{doupdate}{}
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Update the screen.
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Update the physical screen. The curses library keeps two data
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structures, one representing the current physical screen contents
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and a virtual screen representing the desired next state. The
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\function{doupdate()} ground updates the physical screen to match the
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virtual screen.
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The virtual screen may be updated by a \method{noutrefresh()} call
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after write operations such as \method{addstr()} have been performed
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on a window. The normal \method{refresh()} call is simply
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\method{noutrefresh()} followed by \function{doupdate()}; if you have
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to update multiple windows, you can speed performance and perhaps
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reduce screen flicker by issuing \method{noutrefresh()} calls on
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all windows, followed by a single \function{doupdate()}.
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\end{funcdesc}
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\begin{funcdesc}{echo}{}
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Enter echo mode.
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Enter echo mode. In echo mode, each character input is echoed to the
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screen as it is entered.
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\end{funcdesc}
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\begin{funcdesc}{endwin}{}
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@ -110,24 +137,30 @@ De-initialize the library, and return terminal to normal status.
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\end{funcdesc}
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\begin{funcdesc}{erasechar}{}
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Returns the user's current erase character.
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Returns the user's current erase character. Under Unix operating
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systems this is a property of the controlling tty of the curses
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program, and is not set by the curses library itself.
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\end{funcdesc}
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\begin{funcdesc}{filter}{}
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The \function{filter()} routine, if used, must be called before
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\function{initscr()} is called.
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The effect is that, during those calls, LINES is set to 1; the
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capabilities clear, cup, cud, cud1, cuu1, cuu, vpa are disabled; and
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the home string is set to the value of cr.
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The \function{filter()} routine, if used, must be called before
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\function{initscr()} is called. The effect is that, during those
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calls, LINES is set to 1; the capabilities clear, cup, cud, cud1,
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cuu1, cuu, vpa are disabled; and the home string is set to the value of cr.
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The effect is that the cursor is confined to the current line, and so
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are screen updates. This may be used for enabling cgaracter-at-a-time
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line editing without touching the rest of the screen.
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\end{funcdesc}
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\begin{funcdesc}{flash}{}
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Flash the screen.
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Flash the screen. That is, change it to reverse-video and then change
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it back in a short interval. Some people prefer such as `visible bell'
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to the audible attention signal produced by \function{beep()}.
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\end{funcdesc}
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\begin{funcdesc}{flushinp}{}
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Flush all input buffers.
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Flush all input buffers. This throws away any typeahead that has
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been typed by the user and has not yet been processed by the program.
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\end{funcdesc}
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\begin{funcdesc}{getmouse}{}
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@ -163,19 +196,21 @@ new window using that data, returning the new window object.
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\end{funcdesc}
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\begin{funcdesc}{has_colors}{}
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Returns true if the terminal can manipulate colors; otherwise, it
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Returns true if the terminal can display colors; otherwise, it
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returns false.
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\end{funcdesc}
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\begin{funcdesc}{has_ic}{}
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Returns true if the terminal has insert- and delete- character
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capabilities.
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capabilities. This function is included for historical reasons only,
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as all modern software terminal emulators have such capabilities.
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\end{funcdesc}
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\begin{funcdesc}{has_il}{}
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Returns true if the terminal has insert- and
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delete-line capabilities, or can simulate them using
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scrolling regions.
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scrolling regions. This function is included for historical reasons only,
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as all modern software terminal emulators have such capabilities.
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\end{funcdesc}
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\begin{funcdesc}{has_key}{ch}
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@ -188,7 +223,7 @@ Used for half-delay mode, which is similar to cbreak mode in that
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characters typed by the user are immediately available to the program.
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However, after blocking for \var{tenths} tenths of seconds, an
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exception is raised if nothing has been typed. The value of
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\var{tenths} must be a number between 1 and 255. Use nocbreak to
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\var{tenths} must be a number between 1 and 255. Use \function{nocbreak()} to
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leave half-delay mode.
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\end{funcdesc}
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@ -199,7 +234,8 @@ green, and blue components). The value of \var{color_number} must be
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between 0 and COLORS. Each of \var{r}, \var{g}, \var{b}, must be a
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value between 0 and 1000. When \function{init_color()} is used, all
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occurrences of that color on the screen immediately change to the new
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definition.
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definition. This function is a no-op on most terminals; it is active
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only if \function{can_change_color()} returns 1.
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\end{funcdesc}
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\begin{funcdesc}{init_pair}{pair_number, fg, bg}
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@ -219,26 +255,34 @@ the whole screen.
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\end{funcdesc}
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\begin{funcdesc}{isendwin}{}
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Returns true if \function{endwin()} has been called.
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Returns true if \function{endwin()} has been called (that is, the
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curses library has been deinitialized).
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\end{funcdesc}
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\begin{funcdesc}{keyname}{k}
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Return the name of the key numbered \var{k}.
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Return the name of the key numbered \var{k}. The name of a key
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generating printable ASCII character is the key's character. The name
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of a control-key combination is a two-character string consisting of a
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caret followed by the corresponding printable ASCII character. The
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name of an alt-key combination (128-255) is a string consisting of the
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prefix `M-' followed by the name of the corresponding ASCII character.
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\end{funcdesc}
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\begin{funcdesc}{killchar}{}
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Returns the user's current line kill character.
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Returns the user's current line kill character. Under Unix operating
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systems this is a property of the controlling tty of the curses
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program, and is not set by the curses library itself.
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\end{funcdesc}
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\begin{funcdesc}{longname}{}
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Returns a string containing a verbose description of the current
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Returns a string containing the terminfo long name field describing the current
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terminal. The maximum length of a verbose description is 128
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characters. It is defined only after the call to
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\function{initscr()}.
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\end{funcdesc}
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\begin{funcdesc}{meta}{yes}
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If \var{yes} is 1, allow 8-bit characters. If \var{yes} is 0,
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If \var{yes} is 1, allow 8-bit characters to be input. If \var{yes} is 0,
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allow only 7-bit chars.
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\end{funcdesc}
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@ -264,19 +308,18 @@ Creates and returns a pointer to a new pad data structure with the
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given number of lines and columns. A pad is returned as a
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window object.
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A pad is like a window,
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except that it is not restricted by the screen size, and is not
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necessarily associated with a particular part of the screen.
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Pads can be used when a large window is needed, and only a part
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of the window will be on the screen at one time. Automatic
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refreshes of pads (e.g., from scrolling or echoing of
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input) do not occur. It is not legal to call wrefresh
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with a pad as an argument; the routines prefresh or
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pnoutrefresh should be called instead. Note that these
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routines require additional parameters to specify the part of
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the pad to be displayed and the location on the screen to be
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used for the display.
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A pad is like a window, except that it is not restricted by the screen
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size, and is not necessarily associated with a particular part of the
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screen. Pads can be used when a large window is needed, and only a
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part of the window will be on the screen at one time. Automatic
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refreshes of pads (e.g., from scrolling or echoing of input) do not
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occur. The \method{refresh()} and \method{noutrefresh()} methods of a
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pad require 6 arguments to specify the part of the pad to be
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displayed and the location on the screen to be used for the display.
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The arguments are pminrow, pmincol, sminrow, smincol, smaxrow,
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smaxcol; the p arguments refer to the upper left corner of the the pad
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region to be displayed and the s arguments define a clipping box on
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the screen within which the pad region is to be displayed.
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\end{funcdesc}
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\begin{funcdesc}{newwin}{\optional{nlines, ncols,} begin_y, begin_x}
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@ -289,32 +332,40 @@ specified position to the lower right corner of the screen.
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\end{funcdesc}
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\begin{funcdesc}{nl}{}
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Enter nl mode.
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Enter newline mode. This mode translates the return key into newline
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on input, and translates newline into return and line-feed on output.
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Newline mode is initially on.
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\end{funcdesc}
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\begin{funcdesc}{nocbreak}{}
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Leave cbreak mode.
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Leave cbreak mode. Return to normal ``cooked'' mode with line buffering.
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\end{funcdesc}
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\begin{funcdesc}{noecho}{}
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Leave echo mode.
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Leave echo mode. Echoing of input characters is turned off,
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\end{funcdesc}
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\begin{funcdesc}{nonl}{}
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Leave nl mode.
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Leave newline mode. Disable translation of return into newline on
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input, and disable low-level translation of newline into
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newline/return on output (but this does not change the behavior of
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addch('\n') which always does the equivalent of return and line feed
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on the virtual screen). With translation off, curses can sometimes speed
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up vertical motion a little; also, it will be able to detect the
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return key on input
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\end{funcdesc}
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\begin{funcdesc}{noqiflush}{}
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When the noqiflush routine is used, normal flush of input and
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output queues associated with the INTR, QUIT and SUSP
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characters will not be done. You may want to call
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\function{noqiflush()} in a signal handler if you want output
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to continue as though the interrupt had not occurred, after the
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handler exits.
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When the noqiflush routine is used, normal flush of input and
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output queues associated with the INTR, QUIT and SUSP
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characters will not be done. You may want to call
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\function{noqiflush()} in a signal handler if you want output
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to continue as though the interrupt had not occurred, after the
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handler exits.
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\end{funcdesc}
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\begin{funcdesc}{noraw}{}
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Leave raw mode.
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Leave raw mode. Return to normal ``cooked'' mode with line buffering.
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\end{funcdesc}
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\begin{funcdesc}{pair_content}{pair_number}
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@ -329,8 +380,9 @@ Returns the number of the color-pair set by the attribute value \var{attr}.
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\end{funcdesc}
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\begin{funcdesc}{putp}{string}
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Equivalent to \code{tputs(str, 1, putchar)}. Note that the output of putp always
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goes to standard output.
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Equivalent to \code{tputs(str, 1, putchar)}; emits the value of a
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specified terminfo capability for the current terminal. Note that the
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output of putp always goes to standard output.
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\end{funcdesc}
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\begin{funcdesc}{qiflush}{ \optional{flag} }
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@ -341,7 +393,10 @@ read.
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\end{funcdesc}
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\begin{funcdesc}{raw}{}
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Enter raw mode.
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Enter raw mode. In raw mode, normal line buffering and
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processing of interrupt, quit, suspend, and flow control keys are
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turned off; characters are presented to curses input functions one
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by one.
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\end{funcdesc}
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\begin{funcdesc}{reset_prog_mode}{}
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@ -433,6 +488,7 @@ following methods:
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\strong{Note:} A \emph{character} means a C character (i.e., an
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\ASCII{} code), rather then a Python character (a string of length 1).
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(This note is true whenever the documentation mentions a character.)
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The builtin \function{ord()} is handy for conveying strings to codes.
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Paint character \var{ch} at \code{(\var{y}, \var{x})} with attributes
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\var{attr}, overwriting any character previously painter at that
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@ -452,15 +508,18 @@ Paint the string \var{str} at \code{(\var{y}, \var{x})} with attributes
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\end{methoddesc}
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\begin{methoddesc}{attroff}{attr}
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Turn off attribute \var{attr}.
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Remove attribute \var{attr} from the ``background'' set applied to all
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writes to the current window.
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\end{methoddesc}
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\begin{methoddesc}{attron}{attr}
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Turn on attribute \var{attr}.
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Add attribute \var{attr} from the ``background'' set applied to all
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writes to the current window.
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\end{methoddesc}
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\begin{methoddesc}{attrset}{attr}
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Set the attributes to \var{attr}.
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Set the ``background'' set of attributes to \var{attr}. This set is
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initially 0 (no attributes).
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\end{methoddesc}
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\begin{methoddesc}{bkgd}{ch\optional{, attr}}
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@ -520,17 +579,17 @@ corner characters are always used by this function.
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\end{methoddesc}
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\begin{methoddesc}{clear}{}
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Like \method{erase()}, but also causes the whole screen to be repainted
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Like \method{erase()}, but also causes the whole window to be repainted
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upon next call to \method{refresh()}.
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\end{methoddesc}
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\begin{methoddesc}{clearok}{yes}
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If \var{yes} is 1, the next call to \method{refresh()}
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will clear the screen completely.
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will clear the window completely.
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\end{methoddesc}
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\begin{methoddesc}{clrtobot}{}
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Erase from cursor to the end of the screen: all lines below the cursor
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Erase from cursor to the end of the window: all lines below the cursor
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are deleted, and then the equivalent of \method{clrtoeol()} is performed.
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\end{methoddesc}
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@ -562,7 +621,7 @@ derived window.
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\begin{methoddesc}{echochar}{ch\optional{, attr}}
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Add character \var{ch} with attribute \var{attr}, and immediately
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call \method{refresh}.
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call \method{refresh} on the window.
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\end{methoddesc}
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\begin{methoddesc}{enclose}{y, x}
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@ -611,7 +670,8 @@ Read a string from the user, with primitive line editing capacity.
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\end{methoddesc}
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\begin{methoddesc}{getyx}{}
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Return a tuple \code{(\var{y}, \var{x})} of current cursor position.
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Return a tuple \code{(\var{y}, \var{x})} of current cursor position
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relative to the window's upper-left corner.
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\end{methoddesc}
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\begin{methoddesc}{hline}{\optional{y, x,} ch, n}
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@ -712,13 +772,12 @@ stream.
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\end{methoddesc}
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\begin{methoddesc}{leaveok}{yes}
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If \var{yes} is 1,
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cursor is left where it is, instead of being at ``cursor position.''
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This reduces cursor movement where possible. If possible it will be made
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invisible.
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If \var{yes} is 1, cursor is left where it is on update, instead of
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being at ``cursor position.'' This reduces cursor movement where
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possible. If possible the cursor will be made invisible.
|
||||
|
||||
If \var{yes} is 0, cursor will always be at
|
||||
``cursor position'' after an update.
|
||||
If \var{yes} is 0, cursor will always be at ``cursor position'' after
|
||||
an update.
|
||||
\end{methoddesc}
|
||||
|
||||
\begin{methoddesc}{move}{new_y, new_x}
|
||||
|
|
@ -792,13 +851,13 @@ Scroll the screen upward by \var{lines} lines.
|
|||
|
||||
\begin{methoddesc}{scrollok}{flag}
|
||||
Controls what happens when the cursor of a window is moved off the
|
||||
edge of the window or scrolling region, either as a result of a
|
||||
newline action on the bottom line, or typing the last character
|
||||
of the last line. If \var{flag} is false, the cursor is left
|
||||
on the bottom line. If \var{flag} is true, the window is
|
||||
scrolled up one line. Note that in order to get the physical
|
||||
scrolling effect on the terminal, it is also necessary to call
|
||||
\method{idlok()}.
|
||||
edge of the window or scrolling region, either as a result of a
|
||||
newline action on the bottom line, or typing the last character
|
||||
of the last line. If \var{flag} is false, the cursor is left
|
||||
on the bottom line. If \var{flag} is true, the window is
|
||||
scrolled up one line. Note that in order to get the physical
|
||||
scrolling effect on the terminal, it is also necessary to call
|
||||
\method{idlok()}.
|
||||
\end{methoddesc}
|
||||
|
||||
\begin{methoddesc}{setscrreg}{top, bottom}
|
||||
|
|
@ -807,7 +866,8 @@ scrolling actions will take place in this region.
|
|||
\end{methoddesc}
|
||||
|
||||
\begin{methoddesc}{standend}{}
|
||||
Turn off all attributes.
|
||||
Turn off the standout attribute. On some terminals this has the
|
||||
side effect of turning off all attributes.
|
||||
\end{methoddesc}
|
||||
|
||||
\begin{methoddesc}{standout}{}
|
||||
|
|
@ -1004,34 +1064,35 @@ been called.
|
|||
|
||||
\begin{tableii}{c|l}{code}{ACS code}{Meaning}
|
||||
\lineii{ACS_BBSS}{}
|
||||
\lineii{ACS_BLOCK}{}
|
||||
\lineii{ACS_BOARD}{}
|
||||
\lineii{ACS_BLOCK}{solid square block}
|
||||
\lineii{ACS_BOARD}{board of squares}
|
||||
\lineii{ACS_BSBS}{}
|
||||
\lineii{ACS_BSSB}{}
|
||||
\lineii{ACS_BSSS}{}
|
||||
\lineii{ACS_BTEE}{}
|
||||
\lineii{ACS_BULLET}{}
|
||||
\lineii{ACS_CKBOARD}{}
|
||||
\lineii{ACS_DARROW}{}
|
||||
\lineii{ACS_DEGREE}{}
|
||||
\lineii{ACS_DIAMOND}{}
|
||||
\lineii{ACS_GEQUAL}{ (Not available with SGI curses)}
|
||||
\lineii{ACS_HLINE}{}
|
||||
\lineii{ACS_LANTERN}{}
|
||||
\lineii{ACS_LARROW}{}
|
||||
\lineii{ACS_LEQUAL}{ (Not available with SGI curses)}
|
||||
\lineii{ACS_LLCORNER}{}
|
||||
\lineii{ACS_LRCORNER}{}
|
||||
\lineii{ACS_LTEE}{}
|
||||
\lineii{ACS_NEQUAL}{ (Not available with SGI curses)}
|
||||
\lineii{ACS_PI}{ (Not available with SGI curses)}
|
||||
\lineii{ACS_PLMINUS}{}
|
||||
\lineii{ACS_PLUS}{}
|
||||
\lineii{ACS_RARROW}{}
|
||||
\lineii{ACS_RTEE}{}
|
||||
\lineii{ACS_S1}{}
|
||||
\lineii{ACS_S3}{ (Not available with SGI curses)}
|
||||
\lineii{ACS_S9}{}
|
||||
\lineii{ACS_BTEE}{bottom tee}
|
||||
\lineii{ACS_BULLET}{bullet}
|
||||
\lineii{ACS_CKBOARD}{checker board (stipple)}
|
||||
\lineii{ACS_DARROW}{arrow pointing down}
|
||||
\lineii{ACS_DEGREE}{degree symbol}
|
||||
\lineii{ACS_DIAMOND}{diamond}
|
||||
\lineii{ACS_GEQUAL}{greater-than-or-equal-to}
|
||||
\lineii{ACS_HLINE}{horizontal line}
|
||||
\lineii{ACS_LANTERN}{lantern symbol}
|
||||
\lineii{ACS_LARROW}{left arrow}
|
||||
\lineii{ACS_LEQUAL}{less-than-or-equal-to}
|
||||
\lineii{ACS_LLCORNER}{lower left-hand corner}
|
||||
\lineii{ACS_LRCORNER}{lower right-hand corner}
|
||||
\lineii{ACS_LTEE}{left tee}
|
||||
\lineii{ACS_NEQUAL}{not-equal sign}
|
||||
\lineii{ACS_PI}{letter pi}
|
||||
\lineii{ACS_PLMINUS}{plus-or-minus sign}
|
||||
\lineii{ACS_PLUS}{plus sign}
|
||||
\lineii{ACS_RARROW}{right arrow}
|
||||
\lineii{ACS_RTEE}{right tee}
|
||||
\lineii{ACS_S1}{scan line 1}
|
||||
\lineii{ACS_S3}{scan line 3}
|
||||
\lineii{ACS_S7}{scan line 7}
|
||||
\lineii{ACS_S9}{scan line 9}
|
||||
\lineii{ACS_SBBS}{}
|
||||
\lineii{ACS_SBSB}{}
|
||||
\lineii{ACS_SBSS}{}
|
||||
|
|
@ -1039,12 +1100,12 @@ been called.
|
|||
\lineii{ACS_SSBS}{}
|
||||
\lineii{ACS_SSSB}{}
|
||||
\lineii{ACS_SSSS}{}
|
||||
\lineii{ACS_STERLING}{ (Not available with SGI curses)}
|
||||
\lineii{ACS_TTEE}{}
|
||||
\lineii{ACS_UARROW}{}
|
||||
\lineii{ACS_ULCORNER}{}
|
||||
\lineii{ACS_URCORNER}{}
|
||||
\lineii{ACS_VLINE}{}
|
||||
\lineii{ACS_STERLING}{pound sterling}
|
||||
\lineii{ACS_TTEE}{top tee}
|
||||
\lineii{ACS_UARROW}{up arrow}
|
||||
\lineii{ACS_ULCORNER}{upper left corner}
|
||||
\lineii{ACS_URCORNER}{upper right corner}
|
||||
\lineii{ACS_VLINE}{vertical line}
|
||||
\end{tableii}
|
||||
|
||||
The following table lists the predefined colors:
|
||||
|
|
|
|||
Loading…
Reference in New Issue