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Describe new fringe bitmap features.

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Kim F. Storm 2004-02-15 18:15:38 +00:00
parent ccbc43315d
commit b2b681f163
1 changed files with 49 additions and 8 deletions
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57
etc/NEWS
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@ -97,16 +97,28 @@ cursor will be displayed in the fringe when positioned on that newline.
The new user option 'overflow-newline-into-fringe' may be set to nil to
revert to the old behaviour of continuing such lines.
** The buffer boundaries (i.e. first and last line in the buffer) may now
be marked with bitmaps in the fringes. In addition, up and down
arrow bitmaps may be shown at the top and bottom of the right fringe
if the window can be scrolled in either direction.
** The buffer boundaries (i.e. first and last line in the buffer) may
now be marked with angle bitmaps in the fringes. In addition, up and
down arrow bitmaps may be shown at the top and bottom of the left or
right fringe if the window can be scrolled in either direction.
This behavior is activated by setting the buffer-local variable
`indicate-buffer-boundaries' to a non-nil value. If value is t, both
boundaries and scrolling arrows are shown; any other non-nil value
shows only the buffer boundaries. The default value of this variable
is found in `default-indicate-buffer-boundaries'.
`indicate-buffer-boundaries' to a non-nil value. The default value of
this variable is found in `default-indicate-buffer-boundaries'.
If value is `left' or `right', both angle and arrow bitmaps are
displayed in the left or right fringe, resp. Any other non-nil value
causes the bitmap on the top line to be displayed in the left fringe,
and the bitmap on the bottom line in the right fringe.
If value is a cons (ANGLES . ARROWS), the car specifies the position
of the angle bitmaps, and the cdr specifies the position of the arrow
bitmaps.
For example, (t . right) places the top angle bitmap in left fringe,
the bottom angle bitmap in right fringe, and both arrow bitmaps in
right fringe. To show just the angle bitmaps in the left fringe, but
no arrow bitmaps, use (left . nil).
** New command `display-local-help' displays any local help at point
in the echo area. It is bound to `C-h .'. It normally displays the
@ -1802,6 +1814,35 @@ configuration files.
* Lisp Changes in Emacs 21.4
** New function 'define-fringe-bitmap' can now be used to change the
built-in fringe bitmaps, as well as create new fringe bitmaps.
The return value is a number identifying the new fringe bitmap.
To change a built-in bitmap, do (require 'fringe) and identify the
bitmap to change with the value of the corresponding symbol, like
`left-truncation-fringe-bitmap' or `continued-line-fringe-bitmap'.
** New function 'destroy-fringe-bitmap' may be used to destroy a
previously created bitmap, or restore a built-in bitmap.
** New function 'set-fringe-bitmap-face' can now be used to set a
specific face to be used for a specific fringe bitmap. Normally,
this should be a face derived from the `fringe' face, specifying
the foreground color as the desired color of the bitmap.
** There are new display properties, left-fringe and right-fringe,
that can be used to show a specific bitmap in the left or right fringe
bitmap of the display line.
Format is 'display '(left-fringe BITMAP [FACE]), where BITMAP is a
number identifying a fringe bitmap, either built-in or as returned by
`define-fringe-bitmap', and FACE is an optional face name to be used
for displaying the bitmap.
** New function `fringe-bitmaps-at-pos' returns a cons (LEFT . RIGHT)
identifying the current fringe bitmaps in the display line at a given
buffer position. A nil value means no bitmap.
+++
** New function `line-number-at-pos' returns line number of current
line in current buffer, or if optional buffer position is given, line