Atomic Sexp Widgets
-------------------
The atoms are s-expressions that do not consist of other
s-expressions. For example, a string, a file name, or a symbol are
atoms, while a list is a composite type. You can edit the value of an
atom with the following widgets.
The syntax for all the atoms are:
TYPE ::= (NAME [KEYWORD ARGUMENT]... [ VALUE ])
The VALUE, if present, is used to initialize the `:value' property
and must be an expression of the same type as the widget. That is, the
string widget can only be initialized with a string.
All the atom widgets take the same keyword arguments as the
`editable-field' widget. Note:editable-field.
- Widget: string
Allows you to edit a string in an editable field.
- Widget: regexp
Allows you to edit a regular expression in an editable field.
- Widget: character
Allows you to enter a character in an editable field.
- Widget: file
Allows you to edit a file name in an editable field. If you invoke
the tag button, you can edit the file name in the mini-buffer with
completion.
Keywords:
`:must-match'
If this is set to non-nil, only existing file names will be
allowed in the minibuffer.
- Widget: directory
Allows you to edit a directory name in an editable field. Similar
to the `file' widget.
- Widget: symbol
Allows you to edit a lisp symbol in an editable field.
- Widget: function
Allows you to edit a lambda expression, or a function name with
completion.
- Widget: variable
Allows you to edit a variable name, with completion.
- Widget: integer
Allows you to edit an integer in an editable field.
- Widget: number
Allows you to edit a number in an editable field.
- Widget: boolean
Allows you to edit a boolean. In lisp this means a variable which
is either nil meaning false, or non-nil meaning true.