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Add count-screen-lines.

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This commit is contained in:
Richard M. Stallman 2001-01-02 03:52:23 +00:00
parent 35b41202ed
commit faee9d2328
1 changed files with 18 additions and 0 deletions
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18
lispref/positions.texi
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@ -528,6 +528,24 @@ The value returned is the window line number point has moved to, with
the top line in the window numbered 0.
@end deffn
@defun count-screen-lines &optional beg end count-final-newline window
This function returns the number of the screen lines occupied by the
text between positions @var{beg} and @var{end}. These arguments default
to the beginning and end of the accessible portion of the buffer.
If region ends with a newline, it is significant if
@var{count-final-newline} is non-@code{nil}. Otherwise it is ignored.
The argument @var{window} specifies the window used for obtaining
parameters such as width, horizontal scrolling, and so on. The default
is the selected window.
Like @code{vertical-motion}, @code{count-screen-lines} always uses the
current buffer, regardless of which buffer is displayed in @var{window}.
This makes possible to use @code{count-screen-lines} in any buffer,
whether or not it is currently displayed in some window.
@end defun
@defun compute-motion from frompos to topos width offsets window
This function scans the current buffer, calculating screen positions.
It scans the buffer forward from position @var{from}, assuming that is