SYNOPSIS
#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;
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 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
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 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 screen-relative coordinates or vice ver-
sa. Please remember, that stdscr-relative coordinates are not always
identical to screen-relative coordinates due to the mechanism to re-
serve 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 coordi-
nates and returned through the pointers. If the conversion was suc-
cessful, 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 coordi-
nates are only replaced by the converted coordinates if the transforma-
tion was successful.
getmouse and ungetmouse return the integer ERR upon failure or OK upon
successful completion.
getmouse
returns an error. If no mouse driver was initialized, or
if the mask parameter is zero,
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
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-
figuring 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. 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.
FreeBSD sysmouse
OS/2 EMX
If you are using an unsupported configuration, 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 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 in-
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 ALSO
curses(3X).
curs_mouse(3X)
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