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mouse(3NCURSES)                                                mouse(3NCURSES)

NAME
       has_mouse, getmouse, ungetmouse, mousemask, wenclose, mouse_trafo,
       wmouse_trafo, mouseinterval - mouse interface through curses

SYNOPSIS
       #include <curses.h>

       typedef unsigned long mmask_t;

       typedef struct
       {
           short id;         /* ID to distinguish multiple devices */
           int x, y, z;      /* event coordinates */
           mmask_t bstate;   /* button state bits */
       }
       MEVENT;
       bool has_mouse(void);
       int getmouse(MEVENT *event);
       int ungetmouse(MEVENT *event);
       mmask_t mousemask(mmask_t newmask, mmask_t *oldmask);
       bool wenclose(const WINDOW *win, int y, int x);
       bool mouse_trafo(int* pY, int* pX, bool to_screen);
       bool wmouse_trafo(const WINDOW* win, int* pY, int* pX,
            bool to_screen);
       int mouseinterval(int erval);

DESCRIPTION
       These functions provide  an  interface  to  mouse  events  from  ncurs-
       es(3NCURSES).   Mouse  events  are  represented by KEY_MOUSE pseudo-key
       values in the wgetch input stream.

       To make mouse events visible, use the mousemask  function.   This  will
       set  the  mouse events to be reported.  By default, no mouse events are
       reported.  The function will return a mask to  indicate  which  of  the
       specified  mouse events can be reported; on complete failure it returns
       0.  If oldmask is non-NULL, this function fills the indicated  location
       with the previous value of the given window's mouse event mask.

       As  a  side  effect,  setting  a  zero mousemask may turn off the mouse
       pointer; setting a nonzero mask may turn it on.  Whether  this  happens
       is device-dependent.

       Here are the mouse event type masks which may be defined:

       Once  a class of mouse events have been made visible in a window, call-
       ing the wgetch function on that window may return KEY_MOUSE as an indi-
       cator  that  a mouse event has been queued.  To read the event data and
       pop the event off the queue, call getmouse.  This function will  return
       OK if a mouse event is actually visible in the given window, ERR other-
       wise.  When getmouse returns OK, the data deposited as y and x  in  the
       event  structure coordinates will be screen-relative character-cell co-
       ordinates.  The returned state mask will have exactly one  bit  set  to
       indicate the event type.  The corresponding data in the queue is marked
       invalid.  A subsequent call to getmouse will retrieve  the  next  older
       item from the queue.

       The  ungetmouse  function  behaves analogously to ungetch.  It pushes a
       KEY_MOUSE event onto the input queue, and associates  with  that  event
       the given state data and screen-relative character-cell coordinates.

       The  wenclose  function  tests  whether a given pair of screen-relative
       character-cell coordinates is enclosed by  a  given  window,  returning
       TRUE  if  it is and FALSE otherwise.  It is useful for determining what
       subset of the screen windows enclose the location of a mouse event.

       The wmouse_trafo function transforms a given pair of  coordinates  from
       stdscr-relative coordinates to coordinates relative to the given window
       or vice versa.  Please remember, that stdscr-relative  coordinates  are
       not  always  identical to window-relative coordinates due to the mecha-
       nism to reserve lines on top or bottom of the screen for other purposes
       (see the ripoffline() and slk_init calls, for example).  If the parame-
       ter to_screen is TRUE, the pointers pY, pX must reference  the  coordi-
       nates  of a location inside the window win.  They are converted to win-
       dow-relative coordinates and returned through  the  pointers.   If  the
       conversion  was  successful,  the function returns TRUE.  If one of the
       parameters was NULL or the location is not inside the window, FALSE  is
       returned.   If  to_screen  is FALSE, the pointers pY, pX must reference
       window-relative coordinates.  They are converted to stdscr-relative co-
       ordinates  if  the  window  win  encloses this point.  In this case the
       function returns TRUE.  If one of the parameters is NULL or  the  point
       is  not  inside the window, FALSE is returned.  Please notice, that the
       referenced coordinates are only replaced by the  converted  coordinates
       if the transformation was successful.

       The mouse_trafo function performs the same translation as wmouse_trafo,
       using stdscr for win.

       The mouseinterval function sets the maximum time  (in  thousands  of  a
       second) that can elapse between press and release events for them to be
       recognized as a click.  Use mouseinterval(0) to disable  click  resolu-
       tion.  This function returns the previous interval value.  Use mousein-
       terval(-1) to obtain the interval without altering it.  The default  is
       one sixth of a second.

       The  has_mouse  function returns TRUE if the mouse driver has been suc-
       cessfully initialized.

       Note that mouse events will be ignored when input is  in  cooked  mode,
       and  will  cause an error beep when cooked mode is being simulated in a
       window by a function such as getstr that expects a linefeed for  input-
       loop termination.

RETURN VALUE
       getmouse  and ungetmouse return the integer ERR upon failure or OK upon
       successful completion.

              getmouse
                   returns an error.  If no mouse driver was  initialized,  or
                   if  the mask parameter is zero, It also returns an error if
                   no more events remain in the queue.

              ungetmouse
                   returns an error if the FIFO is full.

       mousemask returns the mask of reportable events.

       mouseinterval returns the previous interval value, unless the  terminal
       was  not  initialized.   In  that case, it returns the maximum interval
       value (166).

       wenclose and wmouse_trafo are boolean functions returning TRUE or FALSE
       depending on their test result.

PORTABILITY
       These  calls  were designed for ncurses(3NCURSES), and are not found in
       SVr4 curses, 4.4BSD curses, or any other previous version of curses.

       The feature macro NCURSES_MOUSE_VERSION is provided so the preprocessor
       can  be used to test whether these features are present.  If the inter-
       face is changed, the value of NCURSES_MOUSE_VERSION will be  increment-
       ed.   These values for NCURSES_MOUSE_VERSION may be specified when con-
       figuring ncurses:

              1  has definitions for reserved events.  The mask uses 28  bits.

              2  adds  definitions  for  button 5, removes the definitions for
                 reserved events.  The mask uses 29 bits.

       The order of the MEVENT structure members is not guaranteed.  Addition-
       al fields may be added to the structure in the future.

       Under  ncurses(3NCURSES),  these  calls  are  implemented  using either
       xterm's built-in mouse-tracking API or  platform-specific  drivers  in-
       cluding
              Alessandro Rubini's gpm server
              FreeBSD sysmouse
              OS/2 EMX
       If you are using an unsupported configuration, mouse events will not be
       visible to ncurses(3NCURSES) (and the mousemask  function  will  always
       return 0).

       If  the  terminfo entry contains a XM string, this is used in the xterm
       mouse driver to control the way the terminal is initialized  for  mouse
       operation.   The  default,  if  XM is not found, corresponds to private
       mode 1000 of xterm:
              \E[?1000%?%p1%{1}%=%th%el%;
       The z member in the event structure is not presently used.  It  is  in-
       tended  for use with touch screens (which may be pressure-sensitive) or
       with 3D-mice/trackballs/power gloves.

BUGS
       Mouse events under xterm will not in  fact  be  ignored  during  cooked
       mode, if they have been enabled by mousemask.  Instead, the xterm mouse
       report sequence will appear in the string read.

       Mouse events under xterm will not be detected  correctly  in  a  window
       with  its  keypad  bit  off, since they are interpreted as a variety of
       function key.  Your terminfo  description  should  have  kmous  set  to
       "\E[M"  (the  beginning  of  the response from xterm for mouse clicks).
       Other values for kmous are permitted, but under  the  same  assumption,
       i.e., it is the beginning of the response.

       Because  there  are  no standard terminal responses that would serve to
       identify terminals which support the xterm mouse protocol, ncurses  as-
       sumes  that  if  your  $TERM  environment variable contains "xterm", or
       kmous is defined in the terminal description,  then  the  terminal  may
       send mouse events.

SEE ALSO
       ncurses(3NCURSES), kernel(3NCURSES), slk(3NCURSES).

                                                               mouse(3NCURSES)
 

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Gedruckt am: 20.11.2017 16:40 GMT+0100 (2017-11-20T16:40:40+01:00)