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(Window Start): Fix `pos-visible-in-window-p'

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return value.  Third element FULLY replaced by PARTIAL which
specifies number of invisible pixels if row is only partially visible.
(Textual Scrolling): Mention auto-window-vscroll.
(Vertical Scrolling): New defvar auto-window-vscroll.
This commit is contained in:
Kim F. Storm 2005-01-23 13:30:22 +00:00
parent 257a694c19
commit 41ad5140cd
1 changed files with 19 additions and 4 deletions
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23
lispref/windows.texi
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@ -1345,10 +1345,12 @@ non-@code{nil} anyway. @xref{Horizontal Scrolling}.
If @var{position} is visible, @code{pos-visible-in-window-p} returns
@code{t} if @var{partially} is @code{nil}; if @var{partially} is
non-@code{nil}, it returns a list of the form @code{(@var{x} @var{y}
@var{fully})}, where @var{x} and @var{y} are the pixel coordinates
relative to the top left corner of the window, and @var{fully} is
@code{t} if the character after @var{position} is fully visible and
@code{nil} otherwise.
@var{partial})}, where @var{x} and @var{y} are the pixel coordinates
relative to the top left corner of the window, and @var{partial} is
@code{nil} if the character after @var{position} is fully visible;
otherwise it is a cons @code{(@var{rtop} . @var{rbot})} where the
@var{rtop} and @var{rbot} specify the number of invisible pixels at
the top and bottom of the row at @var{position}.
Here is an example:
@ -1397,6 +1399,12 @@ names that fit the user's point of view.
buffer is different from the buffer that is displayed in the selected
window. @xref{Current Buffer}.
If the window contains a row which is taller than the height of the
window (for example in the presense of a large image), the scroll
functions will adjust the window vscroll to scroll the partially
visible row. To disable this feature, Lisp code may bind the variable
`auto-window-vscroll' to @code{nil} (@pxref{Vertical Scrolling}).
@deffn Command scroll-up &optional count
This function scrolls the text in the selected window upward
@var{count} lines. If @var{count} is negative, scrolling is actually
@ -1622,6 +1630,13 @@ If @var{pixels-p} is non-@code{nil}, @var{lines} specifies a number of
pixels. In this case, the return value is @var{lines}.
@end defun
@defvar auto-window-vscroll
If this variable is non-@code{nil}, the line-move, scroll-up, and
scroll-down functions will automatically modify the window vscroll to
scroll through display rows that are taller that the height of the
window, for example in the presense of large images.
@end defvar
@node Horizontal Scrolling
@section Horizontal Scrolling
@cindex horizontal scrolling