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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(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, 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 associ-
ates 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 coordi-
nates 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 param-
eters 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 in order for them to be recognized as a
click. This function returns the previous interval value.
The default is one fifth 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 func-
tion 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 $DISPLAY environment
variable is set, and kmous is defined in the terminal
description, then the terminal may send mouse events.
SEE ALSO
curses(3X).
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