elisp: Keyboard Menus
21.17.3 Menus and the Keyboard
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When a prefix key ending with a keyboard event (a character or function
key) has a definition that is a menu keymap, the keymap operates as a
keyboard menu; the user specifies the next event by choosing a menu item
with the keyboard.
Emacs displays the keyboard menu with the map’s overall prompt
string, followed by the alternatives (the item strings of the map’s
bindings), in the echo area. If the bindings don’t all fit at once, the
user can type <SPC> to see the next line of alternatives. Successive
uses of <SPC> eventually get to the end of the menu and then cycle
around to the beginning. (The variable ‘menu-prompt-more-char’
specifies which character is used for this; <SPC> is the default.)
When the user has found the desired alternative from the menu, he or
she should type the corresponding character—the one whose binding is
that alternative.
-- Variable: menu-prompt-more-char
This variable specifies the character to use to ask to see the next
line of a menu. Its initial value is 32, the code for <SPC>.
Info Catalog
elisp: Mouse Menus
elisp: Menu Keymaps
elisp: Menu Example