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Here are the functions and variables pertaining to key lookup.
This function returns the definition of key in keymap. All the
other functions described in this chapter that look up keys use
lookup-key. Here are examples:
(lookup-key (current-global-map) "\C-x\C-f")
⇒ find-file
(lookup-key (current-global-map) (kbd "C-x C-f"))
⇒ find-file
(lookup-key (current-global-map) "\C-x\C-f12345")
⇒ 2
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If the string or vector key is not a valid key sequence according to the prefix keys specified in keymap, it must be “too long” and have extra events at the end that do not fit into a single key sequence. Then the value is a number, the number of events at the front of key that compose a complete key.
If accept-defaults is non-nil, then lookup-key considers
default bindings as well as bindings for the specific events in key.
Otherwise, lookup-key reports only bindings for the specific sequence
key, ignoring default bindings except when you explicitly ask about
them. (To do this, supply t as an element of key; see
Format of Keymaps.)
If key contains a meta character (not a function key), that character
is implicitly replaced by a two-character sequence: the value of
meta-prefix-char, followed by the corresponding non-meta character.
Thus, the first example below is handled by conversion into the second
example.
(lookup-key (current-global-map) "\M-f")
⇒ forward-word
(lookup-key (current-global-map) "\ef")
⇒ forward-word
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Unlike read-key-sequence, this function does not modify the specified
events in ways that discard information (voir la section Key Sequence Input). In
particular, it does not convert letters to lower case and it does not change
drag events to clicks.
Used in keymaps to undefine keys. It calls ding, but does not cause
an error.
This function returns the binding for key in the current local keymap,
or nil if it is undefined there.
The argument accept-defaults controls checking for default bindings,
as in lookup-key (above).
This function returns the binding for command key in the current
global keymap, or nil if it is undefined there.
The argument accept-defaults controls checking for default bindings,
as in lookup-key (above).
This function returns a list of all the active minor mode bindings of
key. More precisely, it returns an alist of pairs
(modename . binding), where modename is the
variable that enables the minor mode, and binding is key's
binding in that mode. If key has no minor-mode bindings, the value is
nil.
If the first binding found is not a prefix definition (a keymap or a symbol defined as a keymap), all subsequent bindings from other minor modes are omitted, since they would be completely shadowed. Similarly, the list omits non-prefix bindings that follow prefix bindings.
The argument accept-defaults controls checking for default bindings,
as in lookup-key (above).
This variable is the meta-prefix character code. It is used for translating a meta character to a two-character sequence so it can be looked up in a keymap. For useful results, the value should be a prefix event (voir la section Prefix Keys). The default value is 27, which is the ASCII code for <ESC>.
As long as the value of meta-prefix-char remains 27, key lookup
translates M-b into <ESC> b, which is normally defined as
the backward-word command. However, if you were to set
meta-prefix-char to 24, the code for C-x, then Emacs will
translate M-b into C-x b, whose standard binding is the
switch-to-buffer command. (Don't actually do this!) Here is an
illustration of what would happen:
meta-prefix-char ; The default value. ⇒ 27 (key-binding "\M-b") ⇒ backward-word ?\C-x ; The print representation ⇒ 24 ; of a character. (setq meta-prefix-char 24) ⇒ 24 (key-binding "\M-b") ⇒ switch-to-buffer ; Now, typing M-b is ; like typing C-x b. (setq meta-prefix-char 27) ; Avoid confusion! ⇒ 27 ; Restore the default value! |
This translation of one event into two happens only for characters, not for other kinds of input events. Thus, M-<F1>, a function key, is not converted into <ESC> <F1>.
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Ce document a été généré par Eric Reinbold le 13 Octobre 2007 en utilisant texi2html 1.78.