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curs_mouse(3X)							curs_mouse(3X)

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  ncurses(3X).
       Mouse  events  are  represented	by  KEY_MOUSE pseudo-key values	in the
       wgetch(3X) input	stream.

   mousemask
       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.

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

       Name			Description
       ---------------------------------------------------------------------
       BUTTON1_PRESSED		mouse button 1 down
       BUTTON1_RELEASED		mouse button 1 up
       BUTTON1_CLICKED		mouse button 1 clicked
       BUTTON1_DOUBLE_CLICKED	mouse button 1 double clicked
       BUTTON1_TRIPLE_CLICKED	mouse button 1 triple clicked
       ---------------------------------------------------------------------
       BUTTON2_PRESSED		mouse button 2 down
       BUTTON2_RELEASED		mouse button 2 up
       BUTTON2_CLICKED		mouse button 2 clicked
       BUTTON2_DOUBLE_CLICKED	mouse button 2 double clicked
       BUTTON2_TRIPLE_CLICKED	mouse button 2 triple clicked
       ---------------------------------------------------------------------
       BUTTON3_PRESSED		mouse button 3 down
       BUTTON3_RELEASED		mouse button 3 up

       BUTTON3_CLICKED		mouse button 3 clicked
       BUTTON3_DOUBLE_CLICKED	mouse button 3 double clicked
       BUTTON3_TRIPLE_CLICKED	mouse button 3 triple clicked
       ---------------------------------------------------------------------
       BUTTON4_PRESSED		mouse button 4 down
       BUTTON4_RELEASED		mouse button 4 up
       BUTTON4_CLICKED		mouse button 4 clicked
       BUTTON4_DOUBLE_CLICKED	mouse button 4 double clicked
       BUTTON4_TRIPLE_CLICKED	mouse button 4 triple clicked
       ---------------------------------------------------------------------
       BUTTON5_PRESSED		mouse button 5 down
       BUTTON5_RELEASED		mouse button 5 up
       BUTTON5_CLICKED		mouse button 5 clicked
       BUTTON5_DOUBLE_CLICKED	mouse button 5 double clicked
       BUTTON5_TRIPLE_CLICKED	mouse button 5 triple clicked
       ---------------------------------------------------------------------
       BUTTON_SHIFT		shift was down during button state change
       BUTTON_CTRL		control	was down during	button state change
       BUTTON_ALT		alt was	down during button state change
       ALL_MOUSE_EVENTS		report all button state	changes
       REPORT_MOUSE_POSITION	report mouse movement
       ---------------------------------------------------------------------

   getmouse
       Once a class of mouse events has	been made visible in a window, calling
       the wgetch function on that window may return KEY_MOUSE as an indicator
       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 otherwise.
       When getmouse returns OK, the data deposited as y and x	in  the	 event
       structure  coordinates  will  be	screen-relative	character-cell coordi-
       nates.  The returned state mask will have exactly one bit set to	 indi-
       cate the	event type.  The corresponding data in the queue is marked in-
       valid.  A subsequent call to getmouse will retrieve the next older item
       from the	queue.

   ungetmouse
       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.

   wenclose
       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.

   wmouse_trafo
       The wmouse_trafo	function transforms a given pair of  coordinates  from
       stdscr-relative coordinates to coordinates relative to the given	window
       or vice versa.  The resulting stdscr-relative coordinates are  not  al-
       ways  identical	to window-relative coordinates due to the mechanism to
       reserve lines on	top or bottom of the screen for	 other	purposes  (see
       the ripoffline and slk_init(3X) calls, for example).

       o   If the parameter to_screen is TRUE, the pointers pY,	pX must	refer-
	   ence	the coordinates	of a location inside the window	win.  They are
	   converted  to  window-relative coordinates and returned through the
	   pointers.  If the conversion	was successful,	the  function  returns
	   TRUE.

       o   If one of the parameters was	NULL or	the location is	not inside the
	   window, FALSE is returned.

       o   If to_screen	is FALSE, the pointers pY, pX must  reference  window-
	   relative  coordinates.  They	are converted to stdscr-relative coor-
	   dinates if the window win encloses this point.  In  this  case  the
	   function returns TRUE.

       o   If  one  of	the  parameters	is NULL	or the point is	not inside the
	   window, FALSE is returned.  The referenced coordinates are only re-
	   placed  by the converted coordinates	if the transformation was suc-
	   cessful.

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

   mouseinterval
       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.

   has_mouse
       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.

	  o   If  no mouse driver was initialized, or if the mask parameter is
	      zero,

	  o   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(3X), and are not found in SVr4
       curses, 4.4BSD curses, or any other previous version of curses.

       SVr4 curses had support for the mouse in	a variant  of  xterm.	It  is
       mentioned in a few places, but with no supporting documentation:

       o   the	"libcurses" manual page	lists functions	for this feature which
	   are prototyped in curses.h:

	       extern int mouse_set(long int);
	       extern int mouse_on(long	int);
	       extern int mouse_off(long int);
	       extern int request_mouse_pos(void);
	       extern int map_button(unsigned long);
	       extern void wmouse_position(WINDOW *, int *, int	*);
	       extern unsigned long getmouse(void), getbmap(void);

       o   the "terminfo" manual page lists capabilities for the feature

	       buttons		 btns	 BT	  Number of buttons on the mouse
	       get_mouse	 getm	 Gm	  Curses should	get button events
	       key_mouse	 kmous	 Km	  0631,	Mouse event has	occurred
	       mouse_info	 minfo	 Mi	  Mouse	status information
	       req_mouse_pos	 reqmp	 RQ	  Request mouse	position report

       o   the interface made assumptions (as does ncurses) about  the	escape
	   sequences sent to and received from the terminal.

	   For	instance the SVr4 curses library used the get_mouse capability
	   to tell the terminal	which mouse  button  events  it	 should	 send,
	   passing  the	mouse-button bit-mask to the terminal.	Also, it could
	   ask the terminal where the mouse was	using the req_mouse_pos	 capa-
	   bility.

	   Those  features required a terminal which had been modified to work
	   with	curses.	 They were not part of the X Consortium's xterm.

       When developing the xterm mouse support for ncurses in September	 1995,
       Eric  Raymond  was  uninterested	in using the same interface due	to its
       lack of documentation.  Later, in 1998, Mark Hesseling provided support
       in  PDCurses 2.3	using the SVr4 interface.  PDCurses, however, does not
       use video terminals, making it unnecessary to be	concerned  about  com-
       patibility with the escape sequences.

       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 re-
	     served 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(3X),  these  calls  are implemented using	either xterm's
       built-in	mouse-tracking API or platform-specific	drivers	including

	  o   Alessandro Rubini's gpm server

	  o   FreeBSD sysmouse

	  o   OS/2 EMX

       If you are using	an unsupported configuration, mouse events will	not be
       visible	to  ncurses(3X)	(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 mouse driver	also recognizes	a newer	xterm private mode 1006, e.g.,

	  \E[?1006;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.

       The  ALL_MOUSE_EVENTS  class  does  not	include	REPORT_MOUSE_POSITION.
       They are	distinct.  For example,	in xterm,  wheel/scrolling  mice  send
       position	 reports  as  a	 sequence of presses of	buttons	4 or 5 without
       matching	button-releases.

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 kmous is	defined	in the terminal	description, or	if the
       terminal	description's primary  name  or	 aliases  contain  the	string
       "xterm",	then the terminal may send mouse events.  The kmous capability
       is checked first, allowing the use of newer xterm mouse protocols  such
       as xterm's private mode 1006.

SEE ALSO
       curses(3X), curs_kernel(3X), curs_slk(3X), curs_variables(3X).

								curs_mouse(3X)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | PORTABILITY | BUGS | SEE ALSO

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