curs_mouse(3X)

NAME
getmouse, ungetmouse, mousemask, wenclose, mouse_trafo, wmouse_trafo, mouseinterval - mouse interface through curses

SYNOPSIS
#include <ncurses.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;
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
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:
Once a class of mouse events have 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 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 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 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. Please notice, that the referenced coordinates are only replaced by the converted coordinates 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 mouseinterval(-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.

RETURN VALUE
getmouse, ungetmouse and mouseinterval return the integer ERR upon failure or OK upon successful completion. mousemask returns the mask of reportable events. wenclose and wmouse_trafo are boolean functions returning TRUE or FALSE depending on their test result.

PORTABILITY
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-tracking 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). 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.

BUGS
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 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 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 terminal may send mouse events.

SEE ALSO
curses(3X).