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(Command Overview): Improve xrefs.

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(Adjusting Point): Adjusting point applies to intangible and invis.
(Key Sequence Input): Doc extra read-key-sequence args.
Likewise for read-key-sequence-vector.
This commit is contained in:
Richard M. Stallman 2005-02-26 23:52:38 +00:00
parent fe4c5da136
commit ecbfc7e99c
1 changed files with 36 additions and 16 deletions
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52
lispref/commands.texi
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@ -74,15 +74,15 @@ character causes @dfn{quitting} (@pxref{Quitting}).
The editor command loop runs this normal hook before each command. At
that time, @code{this-command} contains the command that is about to
run, and @code{last-command} describes the previous command.
@xref{Hooks}.
@xref{Command Loop Info}.
@end defvar
@defvar post-command-hook
The editor command loop runs this normal hook after each command
(including commands terminated prematurely by quitting or by errors),
and also when the command loop is first entered. At that time,
@code{this-command} describes the command that just ran, and
@code{last-command} describes the command before that. @xref{Hooks}.
@code{this-command} refers to the command that just ran, and
@code{last-command} refers to the command before that.
@end defvar
Quitting is suppressed while running @code{pre-command-hook} and
@ -840,21 +840,21 @@ If the last event came from a keyboard macro, the value is @code{macro}.
@node Adjusting Point
@section Adjusting Point After Commands
It is not easy to display a value of point in the middle of a sequence
of text that has the @code{display} or @code{composition} property. So
after a command finishes and returns to the command loop, if point is
within such a sequence, the command loop normally moves point to the
edge of the sequence.
It is not easy to display a value of point in the middle of a
sequence of text that has the @code{display}, @code{composition} or
@code{intangible} property, or is invisible. Therefore, after a
command finishes and returns to the command loop, if point is within
such a sequence, the command loop normally moves point to the edge of
the sequence.
A command can inhibit this feature by setting the variable
@code{disable-point-adjustment}:
@defvar disable-point-adjustment
@tindex disable-point-adjustment
If this variable is non-@code{nil} when a command returns to the command
loop, then the command loop does not check for text properties such as
@code{display} and @code{composition}, and does not move point out of
sequences that have these properties.
If this variable is non-@code{nil} when a command returns to the
command loop, then the command loop does not check for those text
properties, and does not move point out of sequences that have them.
The command loop sets this variable to @code{nil} before each command,
so if a command sets it, the effect applies only to that command.
@ -2051,7 +2051,7 @@ can use for translating or modifying input events while reading them.
@code{read-key-sequence}. Lisp programs can also call this function;
for example, @code{describe-key} uses it to read the key to describe.
@defun read-key-sequence prompt
@defun read-key-sequence prompt &optional continue-echo dont-downcase-last switch-frame-ok command-loop
@cindex key sequence
This function reads a key sequence and returns it as a string or
vector. It keeps reading events until it has accumulated a complete key
@ -2066,8 +2066,28 @@ Otherwise, it returns a vector, since a vector can hold all kinds of
events---characters, symbols, and lists. The elements of the string or
vector are the events in the key sequence.
The argument @var{prompt} is either a string to be displayed in the echo
area as a prompt, or @code{nil}, meaning not to display a prompt.
The argument @var{prompt} is either a string to be displayed in the
echo area as a prompt, or @code{nil}, meaning not to display a prompt.
The argument @var{continue-echo}, if non-@code{nil}, means to echo
this key as a continuation of the previous key.
Normally any upper case event is converted to lower case if the
original event is undefined and the lower case equivalent is defined.
The argument @var{dont-downcase-last}, if non-@code{nil}, means do not
convert the last event to lower case. This is appropriate for reading
a key sequence to be defined.
The argument @var{switch-frame-ok}, if non-@code{nil}, means that this
function should process a @code{switch-frame} event if the user
switches frames before typing anything. If the user switches frames
in the middle of a key sequence, or at the start of the sequence but
@var{switch-frame-ok} is @code{nil}, then the event will be put off
until after the current key sequence.
The argument @var{command-loop}, if non-@code{nil}, means that this
key sequence is being read by something that will read commands one
after another. It should be @code{nil} if the caller will read just
one key sequence.
In the example below, the prompt @samp{?} is displayed in the echo area,
and the user types @kbd{C-x C-f}.
@ -2089,7 +2109,7 @@ typed while reading with this function works like any other character,
and does not set @code{quit-flag}. @xref{Quitting}.
@end defun
@defun read-key-sequence-vector prompt
@defun read-key-sequence-vector prompt &optional continue-echo dont-downcase-last switch-frame-ok command-loop
This is like @code{read-key-sequence} except that it always
returns the key sequence as a vector, never as a string.
@xref{Strings of Events}.