DragonFly On-Line Manual Pages
nx::current(3) nx::current(3)
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NAME
nx::current - Return information about the method callstack
SYNOPSIS
current ?option?
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DESCRIPTION
current ?option?
This introspection command provides information about various
details, to be identified using option, on the callstack. The
command is invoked from a method body. If option is not
provided, nx::current will default to option object (see below).
nx::current operates on the Tcl callstack and is aware of NX-
specific callstack and stackframe details. option can be any of
the following:
o activelevel returns the actual callstack level which
calls into the currently executing method directly. This
activelevel might correspond the callinglevel, but this
is not necessarily the case. The activelevel also
includes intermediate calls, such as nx::next
invocations. The level is reported as an absolute level
number (# followed by a digit) to be directly used as the
first argument to uplevel or upvar.
o args returns the list of argument values passed into the
currently executing method implementation.
o calledclass returns the name of the class that provides
the method implementation to which the intercepted method
call is to be redirected (only available from within
filter methods).
o calledmethod returns the original method name requested
by intercepted method call (only available from within
filter methods).
o callingclass returns the name of the class which provides
the method implementation calling into the currently
executing method. See also callingobject.
o callinglevel resolves the callstack level of the
originating invocation of the currently executing method
implementation. Callstack levels introduced by method
interception (e.g., filters) and by method combination
(nx::next) are ignored. The level is reported as an
absolute level number (# followed by a digit) to be
directly used as the first argument to uplevel or upvar.
See also activelevel.
o callingobject returns the name of the object which is
calling into the currently executing method. See also
callingclass.
o class returns the name of the class providing the
currently executing method implementation. The returned
method-providing class may be different to the class of
the current object. If called from within a method
implementation provided by the current object itself, an
empty string is returned.
o filterreg returns the object (class) on which the
currently executing method was registered as a filter
method (only available from within filter methods).
o isnextcall will return 1, if the currently executing
method implementation was invoked via nx::next; 0
otherwise.
o method returns the name of the currently executing
method. If an ensemble-method call, the name of the
bottom-most ("leaf") method is returned.
o methodpath returns the combined name of the currently
executing method (including all ensemble levels) in an
ensemble-method call. Otherwise, for a regular method
call, the result corresponds to the result of option
method.
o nextmethod returns the name of the next most specific
method implementation to be called when invoking
nx::next.
o object gives the name of the object on which the
currently executing method implementation is evaluated.
COPYRIGHT
Copyright (c) 2014 Stefan Sobernig <stefan.sobernig@wu.ac.at>, Gustaf Neumann <gustaf.neumann@wu.ac.at>; available under the Creative Commons Attribution 3.0 Austria license (CC BY 3.0 AT).
current 2.0 nx::current(3)
form_page(3X) form_page(3X)
NAME
form_page - set and get form page number
SYNOPSIS
#include <form.h>
int set_current_field(FORM *form, FIELD *field);
FIELD *current_field(const FORM *form);
int unfocus_current_field(FORM *form);
int set_form_page(FORM *form, int n);
int form_page(const FORM *form);
int field_index(const FIELD *field);
DESCRIPTION
The function set_current_field sets the current field of the given
form; current_field returns the current field of the given form.
The function unfocus_current_field removes the focus from the current
field of the form. In such state, inquiries via current_field shall
return a NULL pointer.
The function set_form_page sets the form's page number (goes to page n
of the form).
The function form_page returns the form's current page number.
The function field_index returns the index of the field in the field
array of the form it is connected to. It returns ERR if the argument
is the null pointer or the field is not connected.
RETURN VALUE
Except for form_page, each routine returns one of the following:
E_OK The routine succeeded.
E_BAD_ARGUMENT
Routine detected an incorrect or out-of-range argument.
E_BAD_STATE
Routine was called from an initialization or termination function.
E_INVALID_FIELD
Contents of a field are not valid.
E_REQUEST_DENIED
The form driver could not process the request.
E_SYSTEM_ERROR
System error occurred (see errno(3)).
SEE ALSO
curses(3X), form(3X).
NOTES
The header file <form.h> automatically includes the header file
<curses.h>.
PORTABILITY
These routines emulate the System V forms library. They were not
supported on Version 7 or BSD versions.
The unfocus_current_field function is an ncurses extension.
AUTHORS
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S.
Raymond.
form_page(3X)