'\" t
.\"***************************************************************************
-.\" Copyright (c) 1998-2010,2013 Free Software Foundation, Inc. *
+.\" Copyright (c) 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 *
.\" authorization. *
.\"***************************************************************************
.\"
-.\" $Id: curs_mouse.3x,v 1.39 2013/06/22 18:09:42 tom Exp $
+.\" $Id: curs_mouse.3x,v 1.47 2017/11/18 23:52:45 tom Exp $
+.ie \n(.g .ds `` \(lq
+.el .ds `` ``
+.ie \n(.g .ds '' \(rq
+.el .ds '' ''
+.de NS
+.ie n .sp
+.el .sp .5
+.ie n .in +4
+.el .in +2
+.nf
+.ft C \" Courier
+..
+.de NE
+.fi
+.ft R
+.in -4
+..
+.de bP
+.ie n .IP \(bu 4
+.el .IP \(bu 2
+..
.TH curs_mouse 3X ""
.na
.hy 0
.PP
\fBbool has_mouse(void);\fR
.br
-\fBint getmouse(MEVENT *event);\fR
+\fBint getmouse(MEVENT *\fP\fIevent\fP\fB);\fR
.br
-\fBint ungetmouse(MEVENT *event);\fR
+\fBint ungetmouse(MEVENT *\fP\fIevent\fP\fB);\fR
.br
-\fBmmask_t mousemask(mmask_t newmask, mmask_t *oldmask);\fR
+\fBmmask_t mousemask(mmask_t \fP\fInewmask\fP\fB, mmask_t *\fP\fIoldmask\fP\fB);\fR
.br
-\fBbool wenclose(const WINDOW *win, int y, int x);\fR
+\fBbool wenclose(const WINDOW *\fP\fIwin\fP\fB, int \fP\fIy\fP\fB, int \fP\fIx\fP\fB);\fR
.br
-\fBbool mouse_trafo(int* pY, int* pX, bool to_screen);\fR
+\fBbool mouse_trafo(int* \fP\fIpY\fP\fB, int* \fP\fIpX\fP\fB, bool \fP\fIto_screen\fP\fB);\fR
.br
-\fBbool wmouse_trafo(const WINDOW* win, int* pY, int* pX,\fR
+\fBbool wmouse_trafo(const WINDOW* \fP\fIwin\fP\fB, int* \fP\fIpY\fP\fB, int* \fP\fIpX\fP\fB,\fR
.br
- \fBbool to_screen);\fR
+ \fBbool \fP\fIto_screen\fP\fB);\fR
.br
-\fBint mouseinterval(int erval);\fR
+\fBint mouseinterval(int \fP\fIerval\fP\fB);\fR
.br
.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.
+pseudo-key values in the \fBwgetch\fR(3X) input stream.
+.SS mousemask
.PP
To make mouse events visible, use the \fBmousemask\fR function.
This will set
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.
+.SS Mouse events
.PP
Here are the mouse event type masks which may be defined:
.PP
REPORT_MOUSE_POSITION report mouse movement
_
.TE
+.SS getmouse
.PP
-Once a class of mouse events have been made visible in a window,
+Once a class of mouse events has 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.
To read the event data and pop the event off the queue, call
The corresponding data in the queue is marked invalid.
A subsequent call to \fBgetmouse\fP will retrieve the next older
item from the queue.
+.SS ungetmouse
.PP
The \fBungetmouse\fR function behaves analogously to \fBungetch\fR.
It pushes
a \fBKEY_MOUSE\fR event onto the input queue, and associates with that event
the given state data and screen-relative character-cell coordinates.
+.SS wenclose
.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.
+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.
+.SS wmouse_trafo
.PP
The \fBwmouse_trafo\fR 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
+The resulting stdscr-relative coordinates are not always identical
to window-relative coordinates due to the mechanism to reserve lines on top
or bottom of the screen for other purposes
-(see the \fBripoffline()\fP and \fBslk_init\fR calls, for example).
+(see the \fBripoffline\fP and \fBslk_init\fR(3X) calls, for example).
+.bP
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 window-relative coordinates and returned
through the pointers.
If the conversion was successful, the function returns \fBTRUE\fR.
+.bP
If one of the parameters was NULL or the location is
not inside the window, \fBFALSE\fR is returned.
+.bP
If \fBto_screen\fR is
\fBFALSE\fR, the pointers \fBpY, pX\fR must reference window-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.
+.bP
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
+The referenced coordinates
are only replaced by the converted coordinates if the transformation was
successful.
+.SS mouse_trafo
.PP
The \fBmouse_trafo\fR function performs the same translation
as \fBwmouse_trafo\fR,
using stdscr for \fBwin\fR.
+.SS mouseinterval
.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
This function returns the previous interval value.
Use \fBmouseinterval(\-1)\fR to obtain the interval without altering it.
The default is one sixth of a second.
+.SS has_mouse
.PP
-The \fBhas_mouse\fP function returns TRUE if the mouse driver has been
+The \fBhas_mouse\fP function returns \fBTRUE\fP if the mouse driver has been
successfully initialized.
.PP
Note that mouse events will be ignored when input is in cooked mode, and will
.SH RETURN VALUE
\fBgetmouse\fR and \fBungetmouse\fR
return the integer \fBERR\fR upon failure or \fBOK\fR
-upon successful completion.
-.RS
+upon successful completion:
+.RS 3
.TP 5
\fBgetmouse\fP
returns an error.
+.bP
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.
+.bP
+It also returns an error if no more events remain in the queue.
.TP 5
\fBungetmouse\fP
returns an error if the FIFO is full.
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.
.PP
+SVr4 curses had support for the mouse in a variant of \fBxterm\fP.
+It is mentioned in a few places, but with no supporting documentation:
+.bP
+the \*(``libcurses\*('' manual page lists functions for this feature
+which are prototyped in \fBcurses.h\fP:
+.NS
+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);
+.NE
+.bP
+the \*(``terminfo\*('' manual page lists capabilities for the feature
+.NS
+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
+.NE
+.bP
+the interface made assumptions (as does ncurses) about the escape sequences
+sent to and received from the terminal.
+.IP
+For instance
+the SVr4 curses library used the \fBget_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 \fBreq_mouse_pos\fP capability.
+.IP
+Those features required a terminal which had been modified to work with curses.
+They were not part of the X Consortium's xterm.
+.PP
+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 compatibility with the
+escape sequences.
+.PP
The feature macro \fBNCURSES_MOUSE_VERSION\fR is provided so the preprocessor
can be used to test whether these features are present.
If the interface is changed, the value of \fBNCURSES_MOUSE_VERSION\fR will be
incremented.
These values for \fBNCURSES_MOUSE_VERSION\fR may be
specified when configuring ncurses:
-.RS
+.RS 3
.TP 3
1
has definitions for reserved events.
Under \fBncurses\fR(3X), these calls are implemented using either
xterm's built-in mouse-tracking API or
platform-specific drivers including
-.RS
+.RS 3
+.bP
Alessandro Rubini's gpm server
-.br
+.bP
FreeBSD sysmouse
-.br
+.bP
OS/2 EMX
.RE
+.PP
If you are using an unsupported configuration,
mouse events will not be visible to
\fBncurses\fR(3X) (and the \fBmousemask\fR function will always
way the terminal is initialized for mouse operation.
The default, if \fBXM\fR is not found,
corresponds to private mode 1000 of xterm:
-.RS
+.PP
+.RS 3
\\E[?1000%?%p1%{1}%=%th%el%;
.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.
+.PP
+The \fBALL_MOUSE_EVENTS\fP class does not include \fBREPORT_MOUSE_POSITION\fP.
+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.
.SH BUGS
Mouse events under xterm will not in fact be ignored during cooked mode,
if they have been enabled by \fBmousemask\fR.
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