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option.n
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option(n) Tk Commands
_________________________________________________________________
NAME
option - Add/retrieve window options to/from the option
database
SYNOPSIS
option add _p_a_t_t_e_r_n _v_a_l_u_e ?_p_r_i_o_r_i_t_y?
option clear
option get _w_i_n_d_o_w _n_a_m_e _c_l_a_s_s
option readfile _f_i_l_e_N_a_m_e ?_p_r_i_o_r_i_t_y?
_________________________________________________________________
DESCRIPTION
The option command allows you to add entries to the Tk
option database or to retrieve options from the database.
The add form of the command adds a new option to the data-
base. _P_a_t_t_e_r_n contains the option being specified, and con-
sists of names and/or classes separated by asterisks or
dots, in the usual X format. _V_a_l_u_e contains a text string
to associate with _p_a_t_t_e_r_n; this is the value that will be
returned in calls to Tk_GetOption or by invocations of the
option get command. If _p_r_i_o_r_i_t_y is specified, it indicates
the priority level for this option (see below for legal
values); it defaults to interactive. This command always
returns an empty string.
The option clear command clears the option database.
Default options (from the RESOURCE_MANAGER property or the
.Xdefaults file) will be reloaded automatically the next
time an option is added to the database or removed from it.
This command always returns an empty string.
The option get command returns the value of the option
specified for _w_i_n_d_o_w under _n_a_m_e and _c_l_a_s_s. If several
entries in the option database match _w_i_n_d_o_w, _n_a_m_e, and
_c_l_a_s_s, then the command returns whichever was created with
highest _p_r_i_o_r_i_t_y level. If there are several matching
entries at the same priority level, then it returns which-
ever entry was most recently entered into the option data-
base. If there are no matching entries, then the empty
string is returned.
The readfile form of the command reads _f_i_l_e_N_a_m_e, which
should have the standard format for an X resource database
such as .Xdefaults, and adds all the options specified in
that file to the option database. If _p_r_i_o_r_i_t_y is specified,
it indicates the priority level at which to enter the
Tk 1
option(n) Tk Commands
options; _p_r_i_o_r_i_t_y defaults to interactive.
The _p_r_i_o_r_i_t_y arguments to the option command are normally
specified symbolically using one of the following values:
widgetDefault
Level 20. Used for default values hard-coded into
widgets.
startupFile
Level 40. Used for options specified in application-
specific startup files.
userDefault
Level 60. Used for options specified in user-specific
defaults files, such as .Xdefaults, resource databases
loaded into the X server, or user-specific startup
files.
interactive
Level 80. Used for options specified interactively
after the application starts running. If _p_r_i_o_r_i_t_y
isn't specified, it defaults to this level.
Any of the above keywords may be abbreviated. In addition,
priorities may be specified numerically using integers
between 0 and 100, inclusive. The numeric form is probably
a bad idea except for new priority levels other than the
ones given above.
KEYWORDS
database, option, priority, retrieve
Tk 2