elisp: Menu Separators
21.17.1.3 Menu Separators
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A menu separator is a kind of menu item that doesn’t display any
text—instead, it divides the menu into subparts with a horizontal line.
A separator looks like this in the menu keymap:
(menu-item SEPARATOR-TYPE)
where SEPARATOR-TYPE is a string starting with two or more dashes.
In the simplest case, SEPARATOR-TYPE consists of only dashes. That
specifies the default kind of separator. (For compatibility, ‘""’ and
‘-’ also count as separators.)
Certain other values of SEPARATOR-TYPE specify a different style of
separator. Here is a table of them:
‘"--no-line"’
‘"--space"’
An extra vertical space, with no actual line.
‘"--single-line"’
A single line in the menu’s foreground color.
‘"--double-line"’
A double line in the menu’s foreground color.
‘"--single-dashed-line"’
A single dashed line in the menu’s foreground color.
‘"--double-dashed-line"’
A double dashed line in the menu’s foreground color.
‘"--shadow-etched-in"’
A single line with a 3D sunken appearance. This is the default,
used separators consisting of dashes only.
‘"--shadow-etched-out"’
A single line with a 3D raised appearance.
‘"--shadow-etched-in-dash"’
A single dashed line with a 3D sunken appearance.
‘"--shadow-etched-out-dash"’
A single dashed line with a 3D raised appearance.
‘"--shadow-double-etched-in"’
Two lines with a 3D sunken appearance.
‘"--shadow-double-etched-out"’
Two lines with a 3D raised appearance.
‘"--shadow-double-etched-in-dash"’
Two dashed lines with a 3D sunken appearance.
‘"--shadow-double-etched-out-dash"’
Two dashed lines with a 3D raised appearance.
You can also give these names in another style, adding a colon after
the double-dash and replacing each single dash with capitalization of
the following word. Thus, ‘"--:singleLine"’, is equivalent to
‘"--single-line"’.
You can use a longer form to specify keywords such as ‘:enable’ and
‘:visible’ for a menu separator:
‘(menu-item SEPARATOR-TYPE nil . ITEM-PROPERTY-LIST)’
For example:
(menu-item "--" nil :visible (boundp 'foo))
Some systems and display toolkits don’t really handle all of these
separator types. If you use a type that isn’t supported, the menu
displays a similar kind of separator that is supported.
Info Catalog
elisp: Extended Menu Items
elisp: Defining Menus
elisp: Alias Menu Items