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 is device-dependent.
Here are the mouse event type masks:
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
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
Once a class of mouse events have been made visible in a window, calling the wgetch func-
tion 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 oth-
erwise. When getmouse returns OK, 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.
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
The wenclose function tests whether a given pair of screen-relative character-cell coordi-
nates 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
The wmouse_trafo 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 to_screen is TRUE, the pointers pY,
pX must reference the coordinates of a location inside the window win. They are converted
to screen-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 screen-relative coordinates. They are converted to stdscr-relative coordi-
nates 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 coordi-
nates if the transformation was successful.
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 mou-
seinterval(-1) to disable click resolution. This function returns the previous interval
value. 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-loop termination.
getmouse, ungetmouse and mouseinterval return the integer ERR upon failure or OK upon suc-
cessful completion. mousemask returns the mask of reportable events. 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 (its value is 1). If the interface is changed,
the value of NCURSES_MOUSE_VERSION will be incremented.
The order of the MEVENT structure members is not guaranteed. Additional fields may be
added to the structure in the future.
Under ncurses(3X), these calls are implemented using either xterm's built-in mouse-track-
ing API or Alessandro Rubini's gpm server. If you are using something other than xterm
and there is no gpm daemon running on your machine, mouse events will not be visible to
ncurses(3X) (and the wmousemask function will always return 0).
If the terminfo entry contains a XM string, this is used in the xterm mouse driver to con-
trol 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 intended 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 wmousemask. Instead, the xterm mouse report sequence will appear in the string
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 kmous set to "\E[M" (the beginning of the response from xterm for mouse clicks).
Because there are no standard terminal responses that would serve to identify terminals
which support the xterm mouse protocol, ncurses assumes that if your $TERM environment
variable contains "xterm", or kmous is defined in the terminal description, then the ter-
minal may send mouse events.