getmouse, ungetmouse, mousemask, wenclose, mouse_trafo, wmouse_trafo,
mouseinterval - mouse interface through curses
typedef unsigned long mmask_t;
short id; /* ID to distinguish multiple devices */
int x, y, z; /* event coordinates */
mmask_t bstate; /* button state bits */
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,
int mouseinterval(int erval);
These functions provide an interface to mouse events from ncurses(3X).
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
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 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.
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-
getmouse and ungetmouse return the integer ERR upon failure or OK upon
returns an error. If no mouse driver was initialized, or
if the mask parameter is zero,
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
wenclose and wmouse_trafo are boolean functions returning TRUE or FALSE
depending on their test result.
These calls were designed for ncurses(3X), 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‐
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(3X), these calls are implemented using either xterm's
built-in mouse-tracking API or platform-specific drivers including
Alessandro Rubini's gpm server.
If you are using an unsupported configuration, mouse events will not be
visible to ncurses(3X) (and the mousemask function will always return
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:
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.
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 ALSOcurses(3X), curs_kernel(3X), curs_slk(3X).