SYNOPSIS

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);

DESCRIPTION

mousemask

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.

Mouse events

Here are the mouse event type masks which may be defined:

getmouse

Once a class of mouse events has been made visible in a window, calling the wgetch function 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 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.

ungetmouse

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.

wenclose

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.

wmouse_trafo

The wmouse_trafo function transforms a given pair of coordinates 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 reserve lines on top or bottom of the screen for other purposes (see the ripoffline and slk_init calls, for example).

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

mouse_trafo

The mouse_trafo function performs the same translation as wmouse_trafo, using stdscr for win.

mouseinterval

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 resolution. This function returns the previous interval value. Use mouseinterval(-1) to obtain the interval without altering it. The default is one sixth of a second.

has_mouse

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 getstr that expects a linefeed for input-loop termination.

RETURN VALUE

getmouse

returns an error.

•

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.

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 returns the maximum interval value (166).

wenclose and wmouse_trafo are boolean functions returning TRUE or FALSE depending on their test result.

PORTABILITY

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 configuring ncurses:

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

Under ncurses(3NCURSES), these calls are implemented using either xterm's built-in mouse-tracking API or platform-specific drivers including

• Alessandro Rubini's gpm server
• FreeBSD sysmouse
• OS/2 EMX

If you are using an unsupported configuration, mouse events will not be visible to ncurses(3NCURSES) (and the mousemask 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 REPORT_MOUSE_POSITION. 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.