@c -*-texinfo-*-
@c This is part of the GNU Emacs Lisp Reference Manual.
-@c Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999
-@c Free Software Foundation, Inc.
+@c Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2002
+@c Free Software Foundation, Inc.
@c See the file elisp.texi for copying conditions.
@setfilename ../info/frames
@node Frames, Positions, Windows, Top
* Display Feature Testing:: Determining the features of a terminal.
@end menu
- @xref{Display}, for information about the related topic of
+ @xref{Display}, for information about the related topic of
controlling Emacs redisplay.
@node Creating Frames
the frame appear with the wrong ones and then change to the specified
ones. If that bothers you, you can specify the same geometry and
appearance with X resources; those do take effect before the frame is
-created. @xref{Resources X,, X Resources, emacs, The GNU Emacs Manual}.
+created. @xref{X Resources,, X Resources, emacs, The GNU Emacs Manual}.
X resource settings typically apply to all frames. If you want to
specify some X resources solely for the sake of the initial frame, and
@code{mono}.
@item cursor-type
-The way to display the cursor. The legitimate values are @code{bar},
-@code{box}, and @code{(bar . @var{width})}. The symbol @code{box}
-specifies an ordinary black box overlaying the character after point;
-that is the default. The symbol @code{bar} specifies a vertical bar
-between characters as the cursor. @code{(bar . @var{width})}
-specifies a bar @var{width} pixels wide. The symbol @code{hbar}
-specifies a horizontal bar, an underscore-like cursor. @code{(hbar .
-@var{width})} specifiles a horizontal bar @var{width} pixels high.
+How to display the cursor. Legitimate values are:
+
+@table @code
+@item box
+Display a filled box. (This is the default.)
+@item hollow
+Display a hollow box.
+@item nil
+Don't display a cursor.
+@item bar
+Display a vertical bar between characters.
+@item (bar . @var{width})
+Display a vertical bar @var{width} pixels wide between characters.
+@item hbar
+Display a horizontal bar.
+@item (bar . @var{width})
+Display a horizontal bar @var{width} pixels high.
+@end table
@vindex cursor-type
The buffer-local variable @code{cursor-type} overrides the value of
@end ignore
@end table
+@defvar blink-cursor-alist
+This variable specifies how to blink the cursor. Each element has the
+form @code{(@var{on-state} . @var{off-state})}. Whenever the cursor
+type equals @var{on-state} (comparing using @code{equal}), Emacs uses
+@var{off-state} to specify what the cursor looks like when it blinks
+``off''. Both @var{on-state} and @var{off-state} should be suitable
+values for the @code{cursor-type} frame parameter.
+
+There are various defaults for how to blink each type of cursor,
+if the type is not mentioned as an @var{on-state} here. Changes
+in this variable do not take effect immediately, because the variable
+is examined only when you specify a cursor type for a frame.
+@end defvar
+
@node Size and Position
@subsection Frame Size And Position
@cindex size of frame
variable to some other string, around a call to @code{x-get-resource}.
@end defvar
- @xref{Resources X,, X Resources, emacs, The GNU Emacs Manual}.
+ @xref{X Resources,, X Resources, emacs, The GNU Emacs Manual}.
@node Display Feature Testing
@section Display Feature Testing
The functions in this section describe the basic capabilities of a
particular display. Lisp programs can use them to adapt their behavior
-to what the display can do. For example, a program that ordinarly uses
+to what the display can do. For example, a program that ordinarily uses
a popup menu could use the minibuffer if popup menus are not supported.
The optional argument @var{display} in these functions specifies which
(All color displays can do this.)
@end defun
+@anchor{Display Face Attribute Testing}
+@defun display-supports-face-attributes-p attributes &optional display
+@tindex display-supports-face-attributes-p
+This function returns non-@code{nil} if all the face attributes in
+@var{attributes} are supported (@pxref{Face Attributes}).
+
+The definition of `supported' is somewhat heuristic, but basically
+means that a face containing all the attributes in @var{attributes},
+when merged with the default face for display, can be represented in a
+way that's
+
+@enumerate
+@item
+different in appearance than the default face, and
+
+@item
+`close in spirit' to what the attributes specify, if not exact.
+@end enumerate
+
+Point (2) implies that a @code{:weight black} attribute will be
+satisfied by any display that can display bold, as will
+@code{:foreground "yellow"} as long as some yellowish color can be
+displayed, but @code{:slant italic} will @emph{not} be satisfied by
+the tty display code's automatic substitution of a `dim' face for
+italic.
+@end defun
+
@defun display-selections-p &optional display
@tindex display-selections-p
This function returns @code{t} if @var{display} supports selections.