Provided by: tk8.4-doc_8.4.19-4_all bug


       option - Add/retrieve window options to/from the option database


       option add pattern value ?priority?
       option clear
       option get window name class
       option readfile fileName ?priority?


       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 database.
       Pattern  contains  the  option  being  specified,  and  consists  of  names and/or classes
       separated by asterisks or dots, in the usual X format.  Value contains a  text  string  to
       associate  with pattern;  this is the value that will be returned in calls to Tk_GetOption
       or by invocations of the option get command.  If priority 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 window under name and
       class.  If several entries in the option database match window, name, and class, then  the
       command  returns  whichever was created with highest priority level.  If there are several
       matching entries at the same priority level, then it  returns  whichever  entry  was  most
       recently  entered  into  the  option database.  If there are no matching entries, then the
       empty string is returned.

       The readfile form of the command reads fileName, 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 priority is specified, it  indicates  the  priority  level  at
       which to enter the options;  priority defaults to interactive.

       The priority arguments to the option command are normally specified symbolically using one
       of the following values:

              Level 20.  Used for default values hard-coded into widgets.

              Level 40.  Used for options specified in application-specific startup files.

              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

              Level 80.  Used for options specified interactively after  the  application  starts
              running.  If priority 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.


       Instruct  every  button  in  the  application  to  have  red  text on it unless explicitly
              option add *button.foreground red startupFile

       Allow users to control what happens in an entry widget when the Return key is  pressed  by
       specifying  a  script in the option database and add a default option for that which rings
       the bell:
              entry .e
              bind .e <Return> [option get .e returnCommand Command]
              option add *.e.returnCommand bell widgetDefault


       database, option, priority, retrieve