curs_mouse(3x) curs_mouse(3x)
has_mouse, getmouse, ungetmouse, mousemask, wenclose,
mouse_trafo, wmouse_trafo, mouseinterval - mouse interface
through curses
#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);
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 de-
fault, 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 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
---------------------------------------------------------------------
Once a class of mouse events has been made visible in a
window, calling the wgetch function on that window may re-
turn 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 coordinates. The returned
state mask will have exactly one bit set to indicate the
event type. The corresponding data in the queue is marked
invalid. A subsequent call to getmouse will retrieve the
next older item from the queue.
The ungetmouse function behaves analogously to ungetch.
It pushes a KEY_MOUSE event onto the input queue, and as-
sociates 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 other-
wise. 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 coor-
dinates from stdscr-relative coordinates to coordinates
relative to the given window or vice versa. The resulting
stdscr-relative coordinates are not always identical to
window-relative coordinates due to the mechanism to re-
serve lines on top or bottom of the screen for other pur-
poses (see the ripoffline and slk_init calls, for exam-
ple).
o 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 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 refer-
ence window-relative coordinates. They are converted
to stdscr-relative coordinates if the window win en-
closes 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 replaced by the converted coordi-
nates 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 thou-
sands of a second) that can elapse between press and re-
lease events for them to be recognized as a click. Use
mouseinterval(0) to disable click resolution. This func-
tion returns the previous interval value. Use mouseinter-
val(-1) to obtain the interval without altering it. The
default is one sixth of a second.
The has_mouse function returns TRUE if the mouse driver
has been successfully 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 get-
str that expects a linefeed for input-loop termination.
getmouse and ungetmouse return the integer ERR upon fail-
ure 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 re-
turns the maximum interval value (166).
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 interface is changed, the value of
NCURSES_MOUSE_VERSION will be incremented. These values
for NCURSES_MOUSE_VERSION may be specified when configur-
ing ncurses:
1 has definitions for reserved events. The mask uses
28 bits.
2 adds definitions for button 5, removes the defini-
tions for reserved events. The mask uses 29 bits.
The order of the MEVENT structure members is not guaran-
teed. Additional fields may be added to the structure in
the future.
Under ncurses(3x), these calls are implemented using ei-
ther xterm's built-in mouse-tracking API or platform-spe-
cific 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 mouse-
mask 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 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.
The ALL_MOUSE_EVENTS class does not include RE-
PORT_MOUSE_POSITION. They are distinct. For example, in
xterm, wheel/scrolling mice send position reports as a se-
quence of presses of buttons 4 or 5 without matching but-
ton-releases.
Mouse events under xterm will not in fact be ignored dur-
ing 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 inter-
preted as a variety of function key. Your terminfo de-
scription should have kmous set to "\E[M" (the beginning
of the response from xterm for mouse clicks). Other val-
ues for kmous are permitted, but under the same assump-
tion, 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 assumes that if your $TERM envi-
ronment variable contains "xterm", or kmous is defined in
the terminal description, then the terminal may send mouse
events.
curses(3x), curs_kernel(3x), curs_slk(3x), curs_vari-
ables(3x).
curs_mouse(3x)