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(Display): Reorder menu.

Browse source 
(Faces): Cleanup.
(Font Lock): Cleanup.  Mention Options menu.  Delete obsolete text.
(Scrolling): For C-l, don't presume text terminal.
(Horizontal Scrolling): Simplify intro.
(Follow Mode): Clarify.
(Cursor Display): Moved before Display Custom.
(Display Custom): Explain no-redraw-on-reenter is for text terminals.
Doc default-tab-width.  Doc line truncation more thoroughly.
This commit is contained in:
Richard M. Stallman 2005-02-16 09:59:32 +00:00
parent 065e46d08d
commit 0015d6775b
1 changed files with 111 additions and 97 deletions
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208
man/display.texi
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@ -23,20 +23,20 @@ display it.
* Selective Display:: Hiding lines with lots of indentation.
* Optional Mode Line:: Optional mode line display features.
* Text Display:: How text characters are normally displayed.
* Display Custom:: Information on variables for customizing display.
* Cursor Display:: Features for displaying the cursor.
* Display Custom:: Information on variables for customizing display.
@end menu
@node Faces
@section Using Multiple Typefaces
@cindex faces
Emacs supports using multiple styles of displaying characters. Each
style is called a @dfn{face}. Each face can specify various @dfn{face
attributes}, such as the font family, the height, weight and slant of
the characters, the foreground and background color, and underlining
or overlining. A face does not have to specify all of these
attributes; often it inherits many of them from another face.
You can specify various styles for displaying text using
@dfn{faces}. Each face can specify various @dfn{face attributes},
such as the font family, the height, weight and slant of the
characters, the foreground and background color, and underlining or
overlining. A face does not have to specify all of these attributes;
often it inherits most of them from another face.
On a window system, all the Emacs face attributes are meaningful.
On a character terminal, only some of them work. Some character
@ -196,7 +196,7 @@ on your screen using the command @code{ps-print-buffer-with-faces}.
@cindex syntax highlighting and coloring
Font Lock mode is a minor mode, always local to a particular buffer,
which highlights (or ``fontifies'') using various faces according to
which highlights (or ``fontifies'') the buffer contents according to
the syntax of the text you are editing. It can recognize comments and
strings in most languages; in several languages, it can also recognize
and properly highlight various other important constructs---for
@ -227,6 +227,10 @@ this:
(global-font-lock-mode 1)
@end example
@noindent
You can also specify this using the menu bar Options menu, specifying
first Syntax Highlighting and then Save Options.
Font Lock mode uses several specifically named faces to do its job,
including @code{font-lock-string-face}, @code{font-lock-comment-face},
and others. The easiest way to find them all is to use completion
@ -248,10 +252,6 @@ Customize the faces interactively with @kbd{M-x customize-face}, as
described in @ref{Face Customization}.
@end itemize
To get the full benefit of Font Lock mode, you need to choose a
default font which has bold, italic, and bold-italic variants; or else
you need to have a color or gray-scale screen.
@vindex font-lock-maximum-decoration
The variable @code{font-lock-maximum-decoration} specifies the
preferred level of fontification, for modes that provide multiple
@ -447,9 +447,10 @@ Scroll heuristically to bring useful information onto the screen
@kindex C-l
@findex recenter
The most basic scrolling command is @kbd{C-l} (@code{recenter}) with
no argument. It clears the entire screen and redisplays all windows.
In addition, it scrolls the selected window so that point is halfway
down from the top of the window.
no argument. It scrolls the selected window so that point is halfway
down from the top of the window. On a text terminal, it also clears
the screen and redisplays all windows. That is useful in case the
screen is garbled (@pxref{Screen Garbled}).
@kindex C-v
@kindex M-v
@ -566,17 +567,12 @@ window, Emacs recenters the window. By default, @code{scroll-margin} is
@dfn{Horizontal scrolling} means shifting all the lines sideways
within a window---so that some of the text near the left margin is not
displayed at all. Emacs does this automatically in any window that
uses line truncation rather than continuation: whenever point moves
off the left or right edge of the screen, Emacs scrolls the buffer
horizontally to make point visible.
When a window has been scrolled horizontally, text lines are truncated
rather than continued (@pxref{Continuation Lines}), with a @samp{$}
appearing in the first column when there is text truncated to the left,
and in the last column when there is text truncated to the right.
You can use these commands to do explicit horizontal scrolling.
displayed at all. When the text in a window is scrolled horizontally,
text lines are truncated rather than continued (@pxref{Display
Custom}). Whenever a window shows truncated lines, Emacs
automatically updates its horizontal scrolling whenever point moves
off the left or right edge of the screen. You can also use these
commands to do explicit horizontal scrolling.
@table @kbd
@item C-x <
@ -602,10 +598,10 @@ attempting to do so has no effect. This means that you don't have to
calculate the argument precisely for @w{@kbd{C-x >}}; any sufficiently large
argument will restore the normal display.
If you scroll a window horizontally by hand, that sets a lower bound
for automatic horizontal scrolling. Automatic scrolling will continue
to scroll the window, but never farther to the right than the amount
you previously set by @code{scroll-left}.
If you use those commands to scroll a window horizontally, that sets
a lower bound for automatic horizontal scrolling. Automatic scrolling
will continue to scroll the window, but never farther to the right
than the amount you previously set by @code{scroll-left}.
@vindex hscroll-margin
The value of the variable @code{hscroll-margin} controls how close
@ -708,12 +704,12 @@ currently doesn't work on character terminals.)
@cindex windows, synchronizing
@cindex synchronizing windows
@dfn{Follow mode} is a minor mode that makes two windows showing the
same buffer scroll as one tall ``virtual window.'' To use Follow mode,
go to a frame with just one window, split it into two side-by-side
windows using @kbd{C-x 3}, and then type @kbd{M-x follow-mode}. From
then on, you can edit the buffer in either of the two windows, or scroll
either one; the other window follows it.
@dfn{Follow mode} is a minor mode that makes two windows, both
showing the same buffer, scroll as a single tall ``virtual window.''
To use Follow mode, go to a frame with just one window, split it into
two side-by-side windows using @kbd{C-x 3}, and then type @kbd{M-x
follow-mode}. From then on, you can edit the buffer in either of the
two windows, or scroll either one; the other window follows it.
In Follow mode, if you move point outside the portion visible in one
window and into the portion visible in the other window, that selects
@ -756,6 +752,9 @@ the three dots.
precedes hidden lines. Then there is no visible indication of the
hidden lines. This variable becomes local automatically when set.
See also @ref{Outline Mode} for another way to hide part of
the text in a buffer.
@node Optional Mode Line
@section Optional Mode Line Features
@ -914,6 +913,46 @@ they are displayed using their graphics (assuming your terminal supports
them), otherwise as escape sequences. @xref{Single-Byte Character
Support}.
@node Cursor Display
@section Displaying the Cursor
@findex blink-cursor-mode
@vindex blink-cursor-alist
@cindex cursor, locating visually
@cindex cursor, blinking
You can customize the cursor's color, and whether it blinks, using
the @code{cursor} Custom group (@pxref{Easy Customization}). On
graphical terminals, the command @kbd{M-x blink-cursor-mode} enables
or disables the blinking of the cursor. (On text terminals, the
terminal itself blinks the cursor, and Emacs has no control over it.)
You can control how the cursor appears when it blinks off by setting
the variable @code{blink-cursor-alist}.
@cindex cursor in non-selected windows
@vindex cursor-in-non-selected-windows
Normally, the cursor appears in non-selected windows in the ``off''
state, with the same appearance as when the blinking cursor blinks
``off''. For a box cursor, this is a hollow box; for a bar cursor,
this is a thinner bar. To turn off cursors in non-selected windows,
customize the variable @code{cursor-in-non-selected-windows} and assign
it a @code{nil} value.
@vindex x-stretch-cursor
@cindex wide block cursor
On graphical terminals, Emacs can optionally draw the block cursor
as wide as the character under the cursor---for example, if the cursor
is on a tab character, it would cover the full width occupied by that
tab character. To enable this feature, set the variable
@code{x-stretch-cursor} to a non-@code{nil} value.
@findex hl-line-mode
@findex global-hl-line-mode
@cindex highlight current line
If you find it hard to see the cursor, you might like HL Line mode,
a minor mode that highlights the line containing point. Use @kbd{M-x
hl-line-mode} to enable or disable it in the current buffer. @kbd{M-x
global-hl-line-mode} enables or disables the same mode globally.
@node Display Custom
@section Customization of Display
@ -937,18 +976,19 @@ to invert all the lines of the display from what they normally are.
If the variable @code{visible-bell} is non-@code{nil}, Emacs attempts
to make the whole screen blink when it would normally make an audible bell
sound. This variable has no effect if your terminal does not have a way
to make the screen blink.@refill
to make the screen blink.
@vindex no-redraw-on-reenter
When you reenter Emacs after suspending, Emacs normally clears the
screen and redraws the entire display. On some terminals with more than
one page of memory, it is possible to arrange the termcap entry so that
the @samp{ti} and @samp{te} strings (output to the terminal when Emacs
is entered and exited, respectively) switch between pages of memory so
as to use one page for Emacs and another page for other output. Then
you might want to set the variable @code{no-redraw-on-reenter}
non-@code{nil}; this tells Emacs to assume, when resumed, that the
screen page it is using still contains what Emacs last wrote there.
On a text terminal, when you reenter Emacs after suspending, Emacs
normally clears the screen and redraws the entire display. On some
terminals with more than one page of memory, it is possible to arrange
the termcap entry so that the @samp{ti} and @samp{te} strings (output
to the terminal when Emacs is entered and exited, respectively) switch
between pages of memory so as to use one page for Emacs and another
page for other output. Then you might want to set the variable
@code{no-redraw-on-reenter} non-@code{nil}; this tells Emacs to
assume, when resumed, that the screen page it is using still contains
what Emacs last wrote there.
@vindex echo-keystrokes
The variable @code{echo-keystrokes} controls the echoing of multi-character
@ -964,6 +1004,7 @@ default is initially @code{t}. @xref{Display Tables,, Display Tables,
elisp, The Emacs Lisp Reference Manual}.
@vindex tab-width
@vindex default-tab-width
Normally, a tab character in the buffer is displayed as whitespace which
extends to the next display tab stop position, and display tab stops come
at intervals equal to eight spaces. The number of spaces per tab is
@ -971,18 +1012,31 @@ controlled by the variable @code{tab-width}, which is made local by
changing it, just like @code{ctl-arrow}. Note that how the tab character
in the buffer is displayed has nothing to do with the definition of
@key{TAB} as a command. The variable @code{tab-width} must have an
integer value between 1 and 1000, inclusive.
integer value between 1 and 1000, inclusive. The variable
@code{default-tab-width} controls the default value of this variable
for buffers where you have not set it locally.
@c @vindex truncate-lines @c No index entry here, because we have one
@c in the continuation section.
If the variable @code{truncate-lines} is non-@code{nil}, then each
line of text gets just one screen line for display; if the text line is
too long, display shows only the part that fits. If
@code{truncate-lines} is @code{nil}, then long text lines display as
more than one screen line, enough to show the whole text of the line.
@xref{Continuation Lines}. Altering the value of @code{truncate-lines}
makes it local to the current buffer; until that time, the default value
is in effect. The default is initially @code{nil}.
@cindex truncation
@cindex line truncation, and fringes
As an alternative to continuation, Emacs can display long lines by
@dfn{truncation}. This means that all the characters that do not fit
in the width of the screen or window do not appear at all. On
graphical terminals, a small straight arrow in the fringe indicates
truncation at either end of the line. On text terminals, @samp{$}
appears in the first column when there is text truncated to the left,
and in the last column when there is text truncated to the right.
@vindex truncate-lines
@findex toggle-truncate-lines
Horizontal scrolling automatically causes line truncation
(@pxref{Horizontal Scrolling}). You can explicitly enable line
truncation for a particular buffer with the command @kbd{M-x
toggle-truncate-lines}. This works by locally changing the variable
@code{truncate-lines}. If that variable is non-@code{nil}, long lines
are truncated; if it is @code{nil}, they are continued onto multiple
screen lines. Setting the variable @code{truncate-lines} in any way
makes it local to the current buffer; until that time, the default
value is in effect. The default value is normally @code{nil}.
@c @vindex truncate-partial-width-windows @c Idx entry is in Split Windows.
If the variable @code{truncate-partial-width-windows} is
@ -1066,46 +1120,6 @@ result in text that is hard to read. Call the function
@code{tty-suppress-bold-inverse-default-colors} with a non-@code{nil}
argument to suppress the effect of bold-face in this case.
@node Cursor Display
@section Displaying the Cursor
@findex blink-cursor-mode
@vindex blink-cursor-alist
@cindex cursor, locating visually
@cindex cursor, blinking
You can customize the cursor's color, and whether it blinks, using
the @code{cursor} Custom group (@pxref{Easy Customization}). On
graphical terminals, the command @kbd{M-x blink-cursor-mode} enables
or disables the blinking of the cursor. (On text terminals, the
terminal itself blinks the cursor, and Emacs has no control over it.)
You can control how the cursor appears when it blinks off by setting
the variable @code{blink-cursor-alist}.
@cindex cursor in non-selected windows
@vindex cursor-in-non-selected-windows
Normally, the cursor appears in non-selected windows in the ``off''
state, with the same appearance as when the blinking cursor blinks
``off''. For a box cursor, this is a hollow box; for a bar cursor,
this is a thinner bar. To turn off cursors in non-selected windows,
customize the variable @code{cursor-in-non-selected-windows} and assign
it a @code{nil} value.
@vindex x-stretch-cursor
@cindex wide block cursor
On graphical terminals, Emacs can optionally draw the block cursor
as wide as the character under the cursor---for example, if the cursor
is on a tab character, it would cover the full width occupied by that
tab character. To enable this feature, set the variable
@code{x-stretch-cursor} to a non-@code{nil} value.
@findex hl-line-mode
@findex global-hl-line-mode
@cindex highlight current line
If you find it hard to see the cursor, you might like HL Line mode,
a minor mode that highlights the line containing point. Use @kbd{M-x
hl-line-mode} to enable or disable it in the current buffer. @kbd{M-x
global-hl-line-mode} enables or disables the same mode globally.
@ignore
arch-tag: 2219f910-2ff0-4521-b059-1bd231a536c4
@end ignore