mouse_trafo
curs_mouse(3X) curs_mouse(3X)
NAME
getmouse, ungetmouse, mousemask, wenclose, mouse_trafo, wmouse_trafo,
mouseinterval - mouse interface through curses
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:
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
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
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-rel-
ative 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-rela-
tive 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.
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 resolu-
tion. 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. Addi-
tional 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).
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.
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).
curs_mouse(3X)
