NAME
has_mouse, 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;
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
These functions provide an interface to mouse events from
ncurses(3NCURSES). 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
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
---------------------------------------------------------------------
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,
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.
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 coordinates relative to the given window
or vice versa. Please remember, that 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. Please notice, that the
referenced coordinates are only replaced by the converted coordinates
if the transformation was successful.
The mouse_trafo function performs the same translation as wmouse_trafo,
using stdscr for win.
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.
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 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, 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
These calls were designed for ncurses(3NCURSES), 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
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.
BUGS
Mouse events under xterm will not in fact be ignored during cooked
mode, if they have been enabled by mousemask. 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 should have kmous set to
"\E[M" (the beginning of the response from xterm for mouse clicks).
Other values for kmous are permitted, but under the same assumption,
i.e., it is the beginning of the response.
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
ncurses(3NCURSES), kernel(3NCURSES), slk(3NCURSES).
mouse(3NCURSES)