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(Fontsets): Add char-displayable-p.

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(Scroll Bars): New node.
This commit is contained in:
Richard M. Stallman 2003-09-12 00:59:55 +00:00
parent dc45d1a608
commit f6cad0895d
1 changed files with 58 additions and 0 deletions
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lispref/display.texi
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@ -25,6 +25,7 @@ that Emacs presents to the user.
* Faces:: A face defines a graphics style for text characters:
font, colors, etc.
* Fringes:: Controlling window fringes.
* Scroll Bars:: Controlling vertical scroll bars.
* Display Property:: Enabling special display features.
* Images:: Displaying images in Emacs buffers.
* Blinking:: How Emacs shows the matching open parenthesis.
@ -2477,6 +2478,15 @@ Then, the font specifications for all but Chinese GB2312 characters have
Chinese GB2312 characters has a wild card @samp{*} in the @var{family}
field.
@defun char-displayable-p char
This function returns @code{t} if Emacs ought to be able to display
@var{char}. More precisely, if the selected frame's fontset has a
font to display the character set that @var{char} belongs to.
Fontsets can specify a font on a per-character basis; when the fontset
does that, this function's value may not be accurate.
@end defun
@node Fringes
@section Fringes
@cindex Fringes
@ -2525,6 +2535,54 @@ This function returns information about the fringes of a window
@var{right-width} @var{frames-outside-margins})}.
@end defun
@node Scroll Bars
@section Scroll Bars
Normally the frame parameter @code{vertical-scroll-bars} controls
whether the windows in the frame have vertical scroll bars. A
non-@code{nil} parameter value means they do. The frame parameter
@code{scroll-bar-width} specifies how wide they are (@code{nil}
meaning the default). @xref{Window Frame Parameters}.
You can also control this for individual windows. Call the function
@code{set-window-scroll-bars} to specify what to do for a specific window:
@defun set-window-scroll-bars window width &optional vertical-type horizontal-type
Set width and type of scroll bars of window @var{window}. (If
@var{window} is @code{nil}, this applies to the selected window.)
@var{width} specifies the scroll bar width in pixels (@code{nil} means
use whatever is specified for width for the frame).
@var{vertical-type} specifies whether to have a vertical scroll bar
and, if so, where. The possible values are @code{left}, @code{right}
and @code{nil}, just like the values of the
@code{vertical-scroll-bars} frame parameter.
The argument @var{horizontal-type} is meant to specify whether and
where to have horizontal scroll bars, but since they are not
implemented, it has no effect.
@end defun
@defun window-scroll-bars &optional window
Report the width and type of scroll bars specified for @var{window}.
If @var{window} is omitted or @code{nil}, it defaults to the currently
selected window. The value is a list of the form @code{(@var{width}
@var{cols} @var{vertical-type} @var{horizontal-type})}. The value
@var{width} is the value that was specified for the width (which may
be @code{nil}); @var{cols} is the number of columns that the scroll
bar actually occupies.
@var{horizontal-type} is not actually meaningful.
@end defun
If you don't specify these values for a window with
@code{set-window-scroll-bars}, the buffer-local variables
@code{scroll-bar-mode} and @code{scroll-bar-width} in the buffer being
displayed control the window's vertical scroll bars. The function
@code{set-window-buffer} examines these variables. If you change them
in a buffer that is already visible in a window, you can make the
window take note of the new values by calling @code{set-window-buffer}
specifying the same buffer that is already displayed.
@node Display Property
@section The @code{display} Property
@cindex display specification