Commit 31ce4405 authored by Kim F. Storm's avatar Kim F. Storm
Browse files

(Window Start): pos-visible-in-window-p allows

specifying t for position to mean "end of window".
Add window-line-height.
parent b6c146b2
......@@ -1355,6 +1355,9 @@ visible unless @var{partially} is non-@code{nil}. The argument
@var{position} defaults to the current position of point in
@var{window}; @var{window}, to the selected window.
If @var{position} is @code{t}, the last visible position in
@var{window} is checked.
The @code{pos-visible-in-window-p} function considers only vertical
scrolling. If @var{position} is out of view only because @var{window}
has been scrolled horizontally, @code{pos-visible-in-window-p} returns
......@@ -1368,7 +1371,7 @@ visible, it returns a list of the form @code{(@var{x} @var{y})}, where
corner of the window; otherwise it returns an extended list of the
form @code{(@var{x} @var{y} @var{rtop} @var{rbot} @var{rowh}
@var{vpos})}, where the @var{rtop} and @var{rbot} specify the number
of invisible pixels at the top and bottom of the row at
of off-window pixels at the top and bottom of the row at
@var{position}, @var{rowh} specifies the visible height of that row,
and @var{vpos} specifies the vertical position (zero-based row number)
of that row.
......@@ -1385,6 +1388,30 @@ Here is an example:
@end example
@end defun
@defun window-line-height &optional line window
This function returns information about text line @var{line} in @var{window}.
If @var{line} is one of @code{header-line} or @code{mode-line},
@code{window-line-height} returns information about the corresponding
line of the window. Otherwise, @var{line} is a text line number
starting from 0. A negative number counts from the end of the window.
The argument @var{line} defaults to the current line in @var{window};
@var{window}, to the selected window.
If the display is not up-to-date, @code{window-line-height} returns
@code{nil}. In that case, @code{pos-visible-in-window-p} may be used
to obtain related information.
If there is no line corresponding to the specified @var{line},
@code{window-line-height} returns @code{nil}. Otherwise, it returns
a list @code{(@var{height} @var{vpos} @var{ypos} @var{offbot})},
where @var{height} is the height in pixels of the visible part of the
line, @var{vpos} and @var{ypos} are the vertical position in lines and
pixels of the line relative to the top of the first text line, and
@var{offbot} is the number of off-window pixels at the bottom of the
text line. If there are off-window pixels at the top of the (first)
text line, @var{ypos} is negative.
@end defun
@node Textual Scrolling
@section Textual Scrolling
@cindex textual scrolling
......
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