ncurses 6.5 - patch 20240511

[ncurses.git] / man / curs_mouse.3x

diff --git a/man/curs_mouse.3x b/man/curs_mouse.3x
index b15507629b92f7d76e0b5dbc7d8096172c70f221..d67b2761fa229f416e5d18b37b44d3d6ae1e7e6d 100644 (file)
--- a/man/curs_mouse.3x
+++ b/man/curs_mouse.3x
@@ -1,6 +1,7 @@
 '\" t
 .\"***************************************************************************
 '\" t
 .\"***************************************************************************

-.\" Copyright (c) 1998-2002,2003 Free Software Foundation, Inc.              *
+.\" Copyright 2018-2023,2024 Thomas E. Dickey                                *
+.\" Copyright 1998-2015,2017 Free Software Foundation, Inc.                  *

 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" copy of this software and associated documentation files (the            *
 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" copy of this software and associated documentation files (the            *


@@ -27,228 +28,499 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"

-.\" $Id: curs_mouse.3x,v 1.24 2003/12/27 18:47:54 tom Exp $
-.TH curs_mouse 3X ""
+.\" $Id: curs_mouse.3x,v 1.99 2024/05/11 20:39:53 tom Exp $
+.TH curs_mouse 3X 2024-05-11 "ncurses @NCURSES_MAJOR@.@NCURSES_MINOR@" "Library calls"
+.ie \n(.g \{\
+.ds `` \(lq
+.ds '' \(rq
+.\}
+.el \{\
+.ie t .ds `` ``
+.el   .ds `` ""
+.ie t .ds '' ''
+.el   .ds '' ""
+.\}
+.
+.de bP
+.ie n  .IP \(bu 4
+.el    .IP \(bu 2
+..

 .SH NAME
 .SH NAME

-\fBgetmouse\fR, \fBungetmouse\fR,
-\fBmousemask\fR, \fBwenclose\fR,
-\fBmouse_trafo\fR, \fBwmouse_trafo\fR,
-\fBmouseinterval\fR - mouse interface through curses
+\fB\%has_mouse\fP,
+\fB\%getmouse\fP,
+\fB\%ungetmouse\fP,
+\fB\%mousemask\fP,
+\fB\%wenclose\fP,
+\fB\%mouse_trafo\fP,
+\fB\%wmouse_trafo\fP,
+\fB\%mouseinterval\fP \-
+get mouse events in \fIcurses\fR

 .SH SYNOPSIS
 .nf
 \fB#include <curses.h>
 .PP
 \fBtypedef unsigned long mmask_t;
 .PP
 .SH SYNOPSIS
 .nf
 \fB#include <curses.h>
 .PP
 \fBtypedef unsigned long mmask_t;
 .PP

-typedef struct
-{
-    short id;         \fI/* ID to distinguish multiple devices */\fB
-    int x, y, z;      \fI/* event coordinates */\fB
-    mmask_t bstate;   \fI/* button state bits */\fB
-}
-MEVENT;\fR
+\fBtypedef struct {
+\fB    short id;         \fI/* ID to distinguish multiple devices */
+\fB    int x, y, z;      \fI/* event coordinates */
+\fB    mmask_t bstate;   \fI/* button state bits */
+\fB} MEVENT;
+.PP
+\fBbool has_mouse(void);
+.PP
+\fBmmask_t mousemask(mmask_t \fInewmask\fP, mmask_t *\fIoldmask\fP);
+.PP
+\fBint getmouse(MEVENT *\fIevent\fP);
+\fBint ungetmouse(MEVENT *\fIevent\fP);
+.PP
+\fBbool wenclose(const WINDOW *\fIwin\fP, int \fIy\fP, int \fIx\fP);
+.PP
+\fBbool mouse_trafo(int* \fIpY\fP, int* \fIpX\fP, bool \fIto_screen\fP);
+\fBbool wmouse_trafo(const WINDOW* \fIwin\fP,
+.ti +18n \" "bool wmouse_trafo("
+\fBint* \fIpY\fB, int* \fIpX\fB, bool \fIto_screen\fB);
+.PP
+\fBint mouseinterval(int \fIerval\fB);\fR

 .fi
 .fi

-.br
-\fBint getmouse(MEVENT *event);\fR
-.br
-\fBint ungetmouse(MEVENT *event);\fR
-.br
-\fBmmask_t mousemask(mmask_t newmask, mmask_t *oldmask);\fR
-.br
-\fBbool wenclose(const WINDOW *win, int y, int x);\fR
-.br
-\fBbool mouse_trafo(int* pY, int* pX, bool to_screen);\fR
-.br
-\fBbool wmouse_trafo(const WINDOW* win, int* pY, int* pX,\fR
-.br
-       \fBbool to_screen);\fR
-.br
-\fBint mouseinterval(int erval);\fR
-.br

 .SH DESCRIPTION
 These functions provide an interface to mouse events from
 .SH DESCRIPTION
 These functions provide an interface to mouse events from

-\fBncurses\fR(3X).
-Mouse events are represented by \fBKEY_MOUSE\fR
-pseudo-key values in the \fBwgetch\fR input stream.
+\fB\%ncurses\fP(3X).
+Mouse events are represented by \fB\%KEY_MOUSE\fP
+pseudo-key values in the \fB\%wgetch\fP(3X) input stream.
+.SS has_mouse
+The \fB\%has_mouse\fP function returns \fBTRUE\fP if the mouse driver
+has been successfully initialized,
+and \fBFALSE\fP otherwise.

 .PP
 .PP

-To make mouse events visible, use the \fBmousemask\fR function.
-This will set
-the mouse events to be reported.
+Mouse events are ignored when input is in cooked mode, and
+cause an error beep when cooked mode is being simulated in a window by a
+function such as \fB\%getstr\fP that expects a linefeed for input-loop
+termination.
+.SS mousemask
+To make mouse events visible, use the \fB\%mousemask\fP function.
+This sets the mouse events to be reported.

 By default, no mouse events are 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.
+.bP
+The function returns an updated copy of \fInewmask\fP
+to indicate which of the specified mouse events can be reported.
+.IP
+If the screen has not been initialized,
+or if the terminal does not support mouse-events,
+this function returns 0.
+.bP
+If \fIoldmask\fP is non-\fBNULL\fP,
+this function fills the indicated location with the previous value of the
+current screen's mouse event mask.

 .PP
 .PP

-As a side effect, setting a zero mousemask may turn off the mouse pointer;
+As a side effect, setting a zero mouse mask may turn off the mouse pointer;

 setting a nonzero mask may turn it on.
 Whether this happens is device-dependent.
 setting a nonzero mask may turn it on.
 Whether this happens is device-dependent.

-.PP
-Here are the mouse event type masks:
+.SS "Mouse Events"
+Here are the mouse event type masks which may be defined:

 .PP
 .TS
 .PP
 .TS

-l l
-_ _
-l l.
-\fIName\fR     \fIDescription\fR
+Lb Lb
+Lb Lx.
+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
 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
 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
 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
 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

-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
+_
+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   T{
+shift was down during button state change
+T}
+BUTTON_CTRL    T{
+control was down during button state change
+T}
+BUTTON_ALT     T{
+alt was down during button state change
+T}

 ALL_MOUSE_EVENTS       report all button state changes
 REPORT_MOUSE_POSITION  report mouse movement
 ALL_MOUSE_EVENTS       report all button state changes
 REPORT_MOUSE_POSITION  report mouse movement

+_

 .TE
 .TE

-.PP
-Once a class of mouse events have been made visible in a window,
-calling the \fBwgetch\fR function on that window may return
-\fBKEY_MOUSE\fR as an indicator that a mouse event has been queued.
+.SS getmouse
+Once a class of mouse events has been made visible in a window,
+calling the \fB\%wgetch\fP function on that window may return
+\fB\%KEY_MOUSE\fP as an indicator that a mouse event has been queued.

 To read the event data and pop the event off the queue, call
 To read the event data and pop the event off the queue, call

-\fBgetmouse\fR.
-This function will return \fBOK\fR if a mouse event
-is actually visible in the given window, \fBERR\fR otherwise.
-When \fBgetmouse\fR returns \fBOK\fR, the data deposited as y and
+\fB\%getmouse\fP.
+This function will return \fBOK\fP if a mouse event
+is actually visible in the given window, \fBERR\fP otherwise.
+When \fB\%getmouse\fP returns \fBOK\fP, the data deposited as y and

 x in the event structure coordinates will be screen-relative character-cell
 coordinates.
 The returned state mask will have exactly one bit set to
 indicate the event type.
 x in the event structure coordinates will be screen-relative character-cell
 coordinates.
 The returned state mask will have exactly one bit set to
 indicate the event type.

-.PP
-The \fBungetmouse\fR function behaves analogously to \fBungetch\fR.
+The corresponding data in the queue is marked invalid.
+A subsequent call to \fB\%getmouse\fP will retrieve the next older
+item from the queue.
+.SS ungetmouse
+The \fB\%ungetmouse\fP function behaves analogously to \fB\%ungetch\fP.

 It pushes
 It pushes

-a \fBKEY_MOUSE\fR event onto the input queue, and associates with that event
+a \fB\%KEY_MOUSE\fP event onto the input queue, and associates with that event

 the given state data and screen-relative character-cell coordinates.
 the given state data and screen-relative character-cell coordinates.

-.PP
-The \fBwenclose\fR 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.
+.SS wenclose
+The \fB\%wenclose\fP function tests whether a given pair of screen-relative
+character-cell coordinates is enclosed by a given window, returning \fBTRUE\fP
+if it is and \fBFALSE\fP otherwise.

 It is useful for determining what subset of
 the screen windows enclose the location of a mouse event.
 .PP
 It is useful for determining what subset of
 the screen windows enclose the location of a mouse event.
 .PP

-The \fBwmouse_trafo\fR function transforms a given pair of coordinates from
-stdscr-relative coordinates to screen-relative coordinates or vice versa.
-Please remember, that stdscr-relative coordinates are not always identical
-to screen-relative coordinates due to the mechanism to reserve lines on top
-or bottom of the screen for other purposes (ripoff() call, see also slk_...
-functions).
-If the parameter \fBto_screen\fR is \fBTRUE\fR, the pointers
-\fBpY, pX\fR must reference the coordinates of a location inside the window
-\fBwin\fR.
-They are converted to screen-relative coordinates and returned
+If the parameter is a pad,
+\fB\%wenclose\fP uses the most recent screen coordinates used for
+this pad in
+\fB\%prefresh\fP(3X) or
+\fB\%pnoutrefresh\fP(3X).
+.SS wmouse_trafo
+The \fB\%wmouse_trafo\fP function transforms a given pair of coordinates
+from \fB\%stdscr\fP-relative coordinates
+to coordinates relative to the given window or vice versa.
+The resulting \fB\%stdscr\fP-relative coordinates are not always
+identical to screen coordinates due to the mechanism to reserve
+lines on top or bottom of the screen for other purposes
+(see the \fB\%ripoffline\fP(3X) and \fB\%slk_init\fP(3X) calls, for example).
+.bP
+If the parameter \fIto_screen\fP is \fBTRUE\fP, the pointers
+\fIpY, pX\fP must reference the coordinates of a location
+inside the window \fIwin\fP.
+They are converted to \fB\%stdscr\fP-relative coordinates and returned

 through the pointers.
 through the pointers.

-If the conversion was successful, the function returns \fBTRUE\fR.
-If one of the parameters was NULL or the location is
-not inside the window, \fBFALSE\fR is returned.
-If \fBto_screen\fR is
-\fBFALSE\fR, the pointers \fBpY, pX\fR must reference screen-relative
-coordinates.
-They are converted to stdscr-relative coordinates if the
-window \fBwin\fR encloses this point.
-In this case the function returns \fBTRUE\fR.
-If one of the parameters is NULL or the point is not inside the
-window, \fBFALSE\fR is returned.
-Please notice, that the referenced coordinates
+If the conversion was successful, the function returns \fBTRUE\fP.
+.IP
+If one of the parameters was \fBNULL\fP or the location is
+not inside the window, \fBFALSE\fP is returned.
+.bP
+If \fIto_screen\fP is
+\fBFALSE\fP, the pointers \fIpY, pX\fP must reference
+\fB\%stdscr\fP-relative coordinates.
+They are converted to window-relative coordinates if the
+window \fIwin\fP encloses this point.
+In this case the function returns \fBTRUE\fP.
+.IP
+If one of the parameters is \fBNULL\fP or the point is not inside the
+window, \fBFALSE\fP is returned.
+.PP
+The referenced coordinates

 are only replaced by the converted coordinates if the transformation was
 successful.
 are only replaced by the converted coordinates if the transformation was
 successful.

+.SS mouse_trafo
+The \fB\%mouse_trafo\fP function performs the same translation
+as \fB\%wmouse_trafo\fP,
+using \fB\%stdscr\fP for \fIwin\fP.
+.SS mouseinterval
+The \fB\%mouseinterval\fP function sets the maximum time
+(in thousands of a second)
+that can elapse between press and release events for them to
+be resolved as a
+.IR click .
+An application might interpret button press and release events separated
+by more than the mouse interval as a \*(``long press\*('',
+or,
+with motion,
+as a \*(``drag\*(''.
+.PP
+Calling \fB\%mouseinterval(0)\fP disables click resolution.
+When
+.I \%ncurses
+detects a mouse event,
+it awaits further input activity up to this interval,
+and then checks for a subsequent mouse event which can be combined
+with the first event.
+If the timeout expires without input activity
+(which would happen with a zero interval),
+then no click resolution will occur.

 .PP
 .PP

-The \fBmouseinterval\fR 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 \fBmouseinterval(-1)\fR to disable click resolution.

 This function returns the previous interval value.
 This function returns the previous interval value.

-The default is one sixth of a second.
+Use \fB\%mouseinterval(\-1)\fP to obtain the interval without altering it.

 .PP
 .PP

-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 \fBgetstr\fR that expects a linefeed for input-loop
-termination.
+The mouse interval is set to one sixth of a second
+when the corresponding screen is initialized,
+e.g., in \fBinitscr\fP(3X) or \fBsetupterm\fP(3X).

 .SH RETURN VALUE
 .SH RETURN VALUE

-\fBgetmouse\fR, \fBungetmouse\fR and \fBmouseinterval\fR
-return the integer \fBERR\fR upon failure or \fBOK\fR
-upon successful completion.
-\fBmousemask\fR returns the
-mask of reportable events.
-\fBwenclose\fR and \fBwmouse_trafo\fR
-are boolean functions returning \fBTRUE\fR or \fBFALSE\fR depending
-on their test result.
-.SH PORTABILITY
-These calls were designed for \fBncurses\fR(3X), and are not found in SVr4
-curses, 4.4BSD curses, or any other previous version of curses.
+\fB\%has_mouse\fP,
+\fB\%wenclose\fP,
+\fB\%mouse_trafo\fP,
+and
+\fB\%wmouse_trafo\fP
+return \fBTRUE\fP or \fBFALSE\fP as noted above.
+.PP
+\fB\%getmouse\fP and \fB\%ungetmouse\fP
+return \fBERR\fP upon failure and \fBOK\fP upon success.
+.PP
+\fB\%getmouse\fP fails if:
+.bP
+no mouse driver was initialized,
+.bP
+the mask of reportable events is zero,
+.bP
+a mouse event was detected that does not match the mask,
+.bP
+or if no more events remain in the queue.

 .PP
 .PP

-The feature macro \fBNCURSES_MOUSE_VERSION\fR is provided so the preprocessor
-can be used to test whether these features are present (its value is 1).
-If the interface is changed, the value of \fBNCURSES_MOUSE_VERSION\fR will be
-incremented.
+\fB\%ungetmouse\fP returns an error if the event queue is full.

 .PP
 .PP

-The order of the \fBMEVENT\fR structure members is not guaranteed.
+\fB\%mousemask\fP
+returns the mask of reportable events.
+.PP
+\fB\%mouseinterval\fP
+returns the previous interval value, unless
+the terminal was not initialized.
+In that case, it returns the maximum interval value (166).
+.SH NOTES
+The order of the \fB\%MEVENT\fP structure members is not guaranteed.

 Additional fields may be added to the structure in the future.
 .PP
 Additional fields may be added to the structure in the future.
 .PP

-Under \fBncurses\fR(3X), these calls are implemented using either
-xterm's built-in mouse-tracking API or
+Under
+.IR \%ncurses ,
+these calls are implemented using either
+.IR \%xterm 's
+built-in mouse-tracking API or

 platform-specific drivers including
 platform-specific drivers including

-.RS
-Alessandro Rubini's gpm server.
-.br
+.RS 3
+.bP
+Alessandro Rubini's gpm server
+.bP

 FreeBSD sysmouse
 FreeBSD sysmouse

-.br
+.bP

 OS/2 EMX
 .RE
 OS/2 EMX
 .RE

+.PP

 If you are using an unsupported configuration,
 mouse events will not be visible to
 If you are using an unsupported configuration,
 mouse events will not be visible to

-\fBncurses\fR(3X) (and the \fBwmousemask\fR function will always
-return \fB0\fR).
+\fI\%ncurses\fP (and the \fB\%mousemask\fP function will always
+return \fB0\fP).

 .PP
 .PP

-If the terminfo entry contains a \fBXM\fR string,
-this is used in the xterm mouse driver to control the
+If the
+.I \%term\%info
+entry contains a \fBXM\fP string,
+this is used in the
+.I \%xterm
+mouse driver to control the

 way the terminal is initialized for mouse operation.
 way the terminal is initialized for mouse operation.

-The default, if \fBXM\fR is not found,
-corresponds to private mode 1000 of xterm:
-.RS
-\\E[?1000%?%p1%{1}%=%th%el%;
+The default, if \fBXM\fP is not found,
+corresponds to private mode 1000 of
+.I \%xterm:
+.PP
+.RS 3
+\eE[?1000%?%p1%{1}%=%th%el%;
+.RE
+.PP
+The mouse driver also recognizes a newer
+.I \%xterm
+private mode 1006,
+e.g.,
+.PP
+.RS 3
+\eE[?1006;1000%?%p1%{1}%=%th%el%;

 .RE
 .RE

-The z member in the event structure is not presently used.
+.PP
+The \fIz\fP member in the event structure is not presently used.

 It is intended
 for use with touch screens (which may be pressure-sensitive) or with
 3D-mice/trackballs/power gloves.
 It is intended
 for use with touch screens (which may be pressure-sensitive) or with
 3D-mice/trackballs/power gloves.

+.PP
+The \fB\%ALL_MOUSE_EVENTS\fP class does not
+include \fB\%REPORT_MOUSE_POSITION\fP.
+They are distinct.
+For example,
+in
+.IR \%xterm ,
+wheel/scrolling mice send position reports as a sequence of
+presses of buttons 4 or 5 without matching button-releases.
+.SH EXTENSIONS
+These functions were designed for
+\fB\%ncurses\fP(3X),
+and are not found in SVr4
+.IR curses ,
+4.4BSD
+.IR curses ,
+or any other previous curses implementation.
+(SVr4
+.I curses
+did have a
+.I \%getmouse
+function,
+which took no argument and returned a different type.)
+.SH PORTABILITY
+Applications employing the
+.I \%ncurses
+mouse extension should condition its use on the visibility of the
+.B \%NCURSES_MOUSE_VERSION
+preprocessor macro.
+When the interface changes,
+the macro's value increments.
+Multiple versions are available when
+.I \%ncurses
+is configured;
+see section \*(``ALTERNATE CONFIGURATIONS\*('' of \fB\%ncurses\fP(3X).
+The following values may be specified.
+.RS 3
+.TP 3
+1
+has definitions for reserved events.
+The mask uses 28 bits.
+.TP 3
+2
+adds definitions for button 5,
+removes the definitions for reserved events.
+The mask uses 29 bits.
+.RE
+.PP
+SVr4
+.I curses
+had support for the mouse in a variant of \fI\%xterm\fP(1).
+It is mentioned in a few places,
+with little supporting documentation.
+.bP
+Its \*(``libcurses\*('' manual page lists functions for this feature
+prototyped in \fI\%curses.h\fP.
+.PP
+.RS 8
+.EX
+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);
+.EE
+.RE
+.bP
+Its \*(``terminfo\*('' manual page lists capabilities for the feature.
+.\" These don't appear in in the SVID 4th edition, Volume 3,
+.\" terminfo(TI_ENV) man page.  They can be found in, e.g., the "z/OS
+.\" V1R1.0 C Curses" book, Chapter 17, pp. 179-186 (PDF 213-220).
+.RS 8
+.TS
+Lb Lb Lb Lx.
+buttons        btns    BT      T{
+Number of buttons on the mouse
+T}
+get_mouse      getm    Gm      T{
+Curses should get button events
+T}
+key_mouse      kmous   Km      T{
+0631, Mouse event has occurred
+T}
+mouse_info     minfo   Mi      T{
+Mouse status information
+T}
+req_mouse_pos  reqmp   RQ      T{
+Request mouse position report
+T}
+.TE
+.RE
+.bP
+The interface made assumptions
+(as does
+.IR \%ncurses )
+about the escape sequences sent to and received from the terminal.
+.IP
+For instance,
+the SVr4
+.I curses
+library used the \fB\%get_mouse\fP 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 \fB\%req_mouse_pos\fP capability.
+.IP
+Those features required a terminal program that had been modified
+to work with SVr4
+.IR curses .
+They were not part of the X Consortium's
+.IR \%xterm .
+.PP
+When developing the
+.I \%xterm
+mouse support for
+.I \%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
+.I \%PDCurses
+2.3 using the SVr4 interface.
+.IR \%PDCurses ,
+however,
+does not use video terminals,
+making it unnecessary to be concerned about compatibility with the
+escape sequences.

 .SH BUGS
 .SH BUGS

-Mouse events under xterm will not in fact be ignored during cooked mode,
-if they have been enabled by \fBwmousemask\fR.
-Instead, the xterm mouse
-report sequence will appear in the string read.
-.PP
-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 must have \fBkmous\fR set to "\\E[M" (the beginning
-of the response from xterm for mouse clicks).
-.PP
-Because there are no standard terminal responses that would serve to identify
-terminals which support the xterm mouse protocol, \fBncurses\fR assumes that
-if your $TERM environment variable contains "xterm",
-or \fBkmous\fR is defined in
-the terminal description, then the terminal may send mouse events.
+Mouse events from
+.I \%xterm
+are
+.I not
+ignored in cooked mode if they have been enabled by \fB\%mousemask\fP.
+Instead,
+the
+.I \%xterm
+mouse report sequence appears in the string read.
+.PP
+An
+.I \%ncurses
+window must enable \fB\%keypad\fP(3X) to correctly receive mouse event
+reports from
+.I \%xterm
+since they are encoded like function keys.
+Set the terminal's
+.I \%term\%info
+capability \fB\%kmous\fP to \*(``\eE[M\*(''
+(the beginning of the response from
+.I \%xterm
+for mouse clicks).
+Other values of \fB\%kmous\fP are permitted under the same assumption,
+that is,
+the report begins with that sequence.
+.PP
+Because there are no standard response sequences that serve to identify
+terminals supporting the
+.I \%xterm
+mouse protocol,
+.I \%ncurses
+assumes that if \fB\%kmous\fP is defined in the terminal description,
+or if the terminal type's primary name or aliases contain the string
+\%\*(``xterm\*('',
+then the terminal may send mouse events.
+The \fB\%kmous\fP capability is checked first,
+allowing use of newer
+.I \%xterm
+mouse protocols,
+such as its private mode 1006.

 .SH SEE ALSO
 .SH SEE ALSO

-\fBcurses\fR(3X).
-.\"#
-.\"# The following sets edit modes for GNU EMACS
-.\"# Local Variables:
-.\"# mode:nroff
-.\"# fill-column:79
-.\"# End:
+\fB\%curses\fP(3X),
+\fB\%curs_inopts\fP(3X),
+\fB\%curs_kernel\fP(3X),
+\fB\%curs_pad\fP(3X),
+\fB\%curs_slk\fP(3X),
+\fB\%curs_variables\fP(3X)