X-Git-Url: https://git.hcoop.net/bpt/emacs.git/blobdiff_plain/c39937ea1c9a78fa7867cfd15278bf6b3192b73f..ab5796a9f97180707734a81320e3eb81937281fe:/man/display.texi diff --git a/man/display.texi b/man/display.texi index 3d390429a9..fd7f2a10b2 100644 --- a/man/display.texi +++ b/man/display.texi @@ -1,5 +1,5 @@ @c This is part of the Emacs manual. -@c Copyright (C) 1985, 86, 87, 93, 94, 95, 1997, 2000, 2001 +@c Copyright (C) 1985, 86, 87, 93, 94, 95, 1997, 2000, 2001, 2002 @c Free Software Foundation, Inc. @c See file emacs.texi for copying conditions. @node Display, Search, Registers, Top @@ -15,9 +15,10 @@ display it. * Font Lock:: Minor mode for syntactic highlighting using faces. * Highlight Changes:: Using colors to show where you changed the buffer. * Highlight Interactively:: Tell Emacs what text to highlight. -* Trailing Whitespace:: Showing possibly-spurious trailing whitespace. * Scrolling:: Moving text up and down in a window. * Horizontal Scrolling:: Moving text left and right in a window. +* Fringes:: Enabling or disabling window fringes. +* Useless Whitespace:: Showing possibly-spurious trailing whitespace. * Follow Mode:: Follow mode lets two windows scroll as one. * Selective Display:: Hiding lines with lots of indentation. * Optional Mode Line:: Optional mode line display features. @@ -30,11 +31,18 @@ display it. @section Using Multiple Typefaces @cindex faces - When using Emacs with a window system, you can set up multiple -styles of displaying characters. Some of the aspects of style that -you can control are the type font, the foreground color, the -background color, and whether or not to underline text, and in which -color. + 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. + + On a window system, all the Emacs face attributes are meaningful. +On a character terminal, only some of them work. Some character +terminals support inverse video, bold, and underline attributes; some +support colors. Character terminals generally do not support changing +the height and width or the font family. Features which rely on text in multiple faces (such as Font Lock mode) will also work on non-windowed terminals that can display more than one @@ -44,53 +52,69 @@ MS-DOS display (@pxref{MS-DOS}), and the MS-Windows version invoked with the @option{-nw} option. Emacs determines automatically whether the terminal has this capability. - The way you control display style is by defining named @dfn{faces}. -Each face can specify various attributes, like the type font's height, -weight and slant, foreground and background color, and underlining, -but it does not have to specify all of them. By specifying the face -or faces to use for a given part of the text in the buffer, you -control how that text appears. - - The style of display used for a given character in the text is -determined by combining several faces. Any aspect of the display -style that isn't specified by overlays or text properties comes from a -default face which inherits its settings from the frame itself. + You control the appearance of a part of the text in the buffer by +specifying the face or faces to use for it. The style of display used +for any given character is determined by combining the attributes of +all the applicable faces specified for that character. Any attribute +that isn't specified by these faces is taken from the @code{default} face, +whose attributes reflect the default settings of the frame itself. Enriched mode, the mode for editing formatted text, includes several -commands and menus for specifying faces. @xref{Format Faces}, for how -to specify the font for text in the buffer. @xref{Format Colors}, for -how to specify the foreground and background color. - - To alter the appearance of a face, use the customization buffer. -@xref{Face Customization}. You can also use X resources to specify -attributes of particular faces (@pxref{Resources X}). +commands and menus for specifying faces for text in the buffer. +@xref{Format Faces}, for how to specify the font for text in the +buffer. @xref{Format Colors}, for how to specify the foreground and +background color. @cindex face colors, setting @findex set-face-foreground @findex set-face-background - Alternatively, you can change the foreground and background colors -of a specific face with @kbd{M-x set-face-foreground} and @kbd{M-x -set-face-background}. These commands prompt in the minibuffer for a -face name and a color name, with completion, and then set that face to -use the specified color. + To alter the appearance of a face, use the customization buffer. +@xref{Face Customization}. You can also use X resources to specify +attributes of particular faces (@pxref{Resources}). Alternatively, +you can change the foreground and background colors of a specific face +with @kbd{M-x set-face-foreground} and @kbd{M-x set-face-background}. +These commands prompt in the minibuffer for a face name and a color +name, with completion, and then set that face to use the specified +color. Changing the colors of the @code{default} face also changes +the foreground and background colors on all frames, both existing and +those to be created in the future. (You can also set foreground and +background colors for the current frame only; see @ref{Frame +Parameters}.) + + Emacs 21 can correctly display variable-width fonts, but Emacs +commands that calculate width and indentation do not know how to +calculate variable widths. This can sometimes lead to incorrect +results when you use variable-width fonts. In particular, indentation +commands can give inconsistent results, so we recommend you avoid +variable-width fonts for editing program source code. Filling will +sometimes make lines too long or too short. We plan to address these +issues in future Emacs versions. @findex list-faces-display To see what faces are currently defined, and what they look like, type @kbd{M-x list-faces-display}. It's possible for a given face to look different in different frames; this command shows the appearance in the -frame in which you type it. Here's a list of the standardly defined +frame in which you type it. Here's a list of the standard defined faces: @table @code @item default This face is used for ordinary text that doesn't specify any other face. @item mode-line -This face is used for mode lines. By default, it's drawn with shadows -for a ``raised'' effect on window systems, and drawn as the inverse of -the default face on non-windowed terminals. @xref{Display Custom}. +This face is used for the mode line of the currently selected window. +By default, it's drawn with shadows for a ``raised'' effect on window +systems, and drawn as the inverse of the default face on non-windowed +terminals. @xref{Display Custom}. +@item mode-line-inactive +Like @code{mode-line}, but used for mode lines of the windows other +than the selected one (if @code{mode-line-in-non-selected-windows} is +non-@code{nil}). This face inherits from @code{mode-line}, so changes +in that face affect mode lines in all windows. @item header-line Similar to @code{mode-line} for a window's header line. Most modes don't use the header line, but the Info mode does. +@item minibuffer-prompt +This face is used for the prompt strings displayed in the minibuffer. @item highlight This face is used for highlighting portions of text, in various modes. For example, mouse-sensitive text is highlighted using this face. @@ -139,7 +163,8 @@ font of LessTif/Motif menus is currently not supported; attempts to set the font are ignored in this case. @item trailing-whitespace The face for highlighting trailing whitespace when -@code{show-trailing-whitespace} is non-nil. +@code{show-trailing-whitespace} is non-@code{nil}; see @ref{Useless +Whitespace}. @item variable-pitch The basic variable-pitch face. @end table @@ -170,13 +195,14 @@ on your screen using the command @code{ps-print-buffer-with-faces}. @cindex mode, Font Lock @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 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 example, names of functions being defined -or reserved keywords. + Font Lock mode is a minor mode, always local to a particular buffer, +which highlights (or ``fontifies'') using various faces 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 +example, names of functions being defined or reserved keywords. +Some special modes, such as Occur mode and Info mode, have completely +specialized ways of assigning fonts for Font Lock mode. @findex font-lock-mode @findex turn-on-font-lock @@ -248,13 +274,17 @@ beyond which buffer fontification is suppressed. @c @w is used below to prevent a bad page-break. @vindex font-lock-beginning-of-syntax-function +@cindex incorrect fontification +@cindex parenthesis in column zero and fontification +@cindex brace in column zero and fontification Comment and string fontification (or ``syntactic'' fontification) relies on analysis of the syntactic structure of the buffer text. For -the purposes of speed, some modes including C mode and Lisp mode rely on -a special convention: an open-parenthesis in the leftmost column always -defines the @w{beginning} of a defun, and is thus always outside any string -or comment. (@xref{Defuns}.) If you don't follow this convention, -then Font Lock mode can misfontify the text after an open-parenthesis in +the sake of speed, some modes, including C mode and Lisp mode, +rely on a special convention: an open-parenthesis or open-brace in the +leftmost column always defines the @w{beginning} of a defun, and is +thus always outside any string or comment. (@xref{Left Margin +Paren}.) If you don't follow this convention, Font Lock mode can +misfontify the text that follows an open-parenthesis or open-brace in the leftmost column that is inside a string or comment. @cindex slow display during scrolling @@ -283,6 +313,23 @@ comments, use this: '(("\\<\\(FIXME\\):" 1 font-lock-warning-face t))) @end example +@findex font-lock-remove-keywords + To remove keywords from the font-lock highlighting patterns, use the +function @code{font-lock-remove-keywords}. @xref{Search-based +Fontification,,,elisp}, for documentation of the format of this list. + +@cindex just-in-time (JIT) font-lock +@cindex background syntax highlighting + Fontifying large buffers can take a long time. To avoid large +delays when a file is visited, Emacs fontifies only the visible +portion of a buffer. As you scroll through the buffer, each portion +that becomes visible is fontified as soon as it is displayed. The +parts of the buffer that are not displayed are fontified +``stealthily'', in the background, i.e.@: when Emacs is idle. You can +control this background fontification, called @dfn{Just-In-Time}, or +@dfn{JIT} Font Lock, by customizing various options in the +customization group @samp{jit-lock}. @xref{Specific Customization}. + @node Highlight Changes @section Highlight Changes Mode @@ -323,7 +370,7 @@ parts of the text in different ways. @findex unhighlight-regexp Unhighlight @var{regexp} (@code{unhighlight-regexp}). You must enter one of the regular expressions currently specified for highlighting. -(You can use completion, or a menu, to enter one of them +(You can use completion, or choose from a menu, to enter one of them conveniently.) @item C-x w l @var{regexp} @key{RET} @var{face} @key{RET} @@ -331,7 +378,7 @@ conveniently.) @findex highlight-lines-matching-regexp @cindex lines, highlighting @cindex highlighting lines of text -Highlight lines containing a match for @var{regexp}, using face +Highlight entire lines containing a match for @var{regexp}, using face @var{face} (@code{highlight-lines-matching-regexp}). @item C-x w b @@ -358,37 +405,6 @@ This command does nothing if the major mode is a member of the list @code{hi-lock-exclude-modes}. @end table -@node Trailing Whitespace -@section Trailing Whitespace - -@cindex trailing whitespace -@cindex whitespace, trailing -@vindex show-trailing-whitespace - It is easy to leave unnecessary spaces at the end of a line without -realizing it. In most cases, this @dfn{trailing whitespace} has no -effect, but there are special circumstances where it matters. - - You can make trailing whitespace visible on the screen by setting -the variable @code{show-trailing-whitespace} to @code{t}. Then Emacs -displays trailing whitespace in the face @code{trailing-whitespace}. - - Trailing whitespace is defined as spaces or tabs at the end of a -line. But trailing whitespace is not displayed specially if point is -at the end of the line containing the whitespace. (Doing that looks -ugly while you are typing in new text, and the location of point is -enough in that case to show you that the spaces are present.) - -@vindex indicate-empty-lines -@vindex default-indicate-empty-lines -@cindex empty lines - Emacs can indicate empty lines at the end of the buffer with a -special bitmap on the left fringe of the window. To enable this -feature, set the buffer-local variable @code{indicate-empty-lines} to -a non-@code{nil} value. The default value of this variable is -controlled by the variable @code{default-indicate-empty-lines}; -by setting that variable, you can enable or disable this feature -for all new buffers. - @node Scrolling @section Scrolling @@ -413,10 +429,12 @@ point vertically within it (@code{recenter}). @item C-v Scroll forward (a windowful or a specified number of lines) (@code{scroll-up}). @item @key{NEXT} +@itemx @key{PAGEDOWN} Likewise, scroll forward. @item M-v Scroll backward (@code{scroll-down}). @item @key{PRIOR} +@itemx @key{PAGEUP} Likewise, scroll backward. @item @var{arg} C-l Scroll so point is on line @var{arg} (@code{recenter}). @@ -436,30 +454,42 @@ down from the top of the window. @kindex M-v @kindex NEXT @kindex PRIOR +@kindex PAGEDOWN +@kindex PAGEUP @findex scroll-up @findex scroll-down - The scrolling commands @kbd{C-v} and @kbd{M-v} let you move all the text -in the window up or down a few lines. @kbd{C-v} (@code{scroll-up}) with an -argument shows you that many more lines at the bottom of the window, moving -the text and point up together as @kbd{C-l} might. @kbd{C-v} with a -negative argument shows you more lines at the top of the window. -@kbd{M-v} (@code{scroll-down}) is like @kbd{C-v}, but moves in the -opposite direction. The function keys @key{NEXT} and @key{PRIOR} are -equivalent to @kbd{C-v} and @kbd{M-v}. - - The names of scroll commands are based on the direction that the text -moves in the window. Thus, the command to scroll forward is called -@code{scroll-up} because it moves the text upward on the screen. - @vindex next-screen-context-lines - To read the buffer a windowful at a time, use @kbd{C-v} with no argument. -It takes the last two lines at the bottom of the window and puts them at -the top, followed by nearly a whole windowful of lines not previously -visible. If point was in the text scrolled off the top, it moves to the -new top of the window. @kbd{M-v} with no argument moves backward with -overlap similarly. The number of lines of overlap across a @kbd{C-v} or -@kbd{M-v} is controlled by the variable @code{next-screen-context-lines}; by -default, it is 2. + To read the buffer a windowful at a time, use @kbd{C-v} +(@code{scroll-up}) with no argument. This scrolls forward by nearly +the whole window height. The effect is to take the two lines at the +bottom of the window and put them at the top, followed by nearly a +whole windowful of lines that were not previously visible. If point +was in the text that scrolled off the top, it ends up at the new top +of the window. + + @kbd{M-v} (@code{scroll-down}) with no argument scrolls backward in +a similar way, also with overlap. The number of lines of overlap +across a @kbd{C-v} or @kbd{M-v} is controlled by the variable +@code{next-screen-context-lines}; by default, it is 2. The function +keys @key{NEXT} and @key{PRIOR}, or @key{PAGEDOWN} and @key{PAGEUP}, +are equivalent to @kbd{C-v} and @kbd{M-v}. + + The commands @kbd{C-v} and @kbd{M-v} with a numeric argument scroll +the text in the selected window up or down a few lines. @kbd{C-v} +with an argument moves the text and point up, together, that many +lines; it brings the same number of new lines into view at the bottom +of the window. @kbd{M-v} with numeric argument scrolls the text +downward, bringing that many new lines into view at the top of the +window. @kbd{C-v} with a negative argument is like @kbd{M-v} and vice +versa. + + The names of scroll commands are based on the direction that the +text moves in the window. Thus, the command to scroll forward is +called @code{scroll-up} because it moves the text upward on the +screen. The keys @key{PAGEDOWN} and @key{PAGEUP} derive their names +and customary meanings from a different convention that developed +elsewhere; hence the strange result that @key{PAGEDOWN} runs +@code{scroll-up}. @vindex scroll-preserve-screen-position Some users like the full-screen scroll commands to keep point at the @@ -479,8 +509,8 @@ point on the very top line. Point does not move with respect to the text; rather, the text and point move rigidly on the screen. @kbd{C-l} with a negative argument puts point that many lines from the bottom of the window. For example, @kbd{C-u - 1 C-l} puts point on the bottom line, and @kbd{C-u -- 5 C-l} puts it five lines from the bottom. Just @kbd{C-u} as argument, -as in @kbd{C-u C-l}, scrolls point to the center of the selected window. +- 5 C-l} puts it five lines from the bottom. @kbd{C-u C-l} scrolls to put +point at the center (vertically) of the selected window. @kindex C-M-l @findex reposition-window @@ -490,17 +520,17 @@ the screen. For example, in a Lisp file, this command tries to get the entire current defun onto the screen if possible. @vindex scroll-conservatively - Scrolling happens automatically if point has moved out of the visible -portion of the text when it is time to display. Normally, automatic -scrolling centers point vertically within the window. However, if you -set @code{scroll-conservatively} to a small number @var{n}, then if you -move point just a little off the screen---less than @var{n} lines---then -Emacs scrolls the text just far enough to bring point back on screen. -By default, @code{scroll-conservatively} is 0. + Scrolling happens automatically when point moves out of the visible +portion of the text. Normally, automatic scrolling centers point +vertically within the window. However, if you set +@code{scroll-conservatively} to a small number @var{n}, then if you +move point just a little off the screen---less than @var{n} +lines---then Emacs scrolls the text just far enough to bring point +back on screen. By default, @code{scroll-conservatively} is 0. @cindex aggressive scrolling @vindex scroll-up-aggressively -@vindex scroll-down-aggressively +@vindex scroll-down-aggressively When the window does scroll by a longer distance, you can control how aggressively it scrolls, by setting the variables @code{scroll-up-aggressively} and @code{scroll-down-aggressively}. @@ -533,7 +563,7 @@ 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 +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. @@ -571,12 +601,101 @@ 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 further to the right than the amount +to scroll the window, but never farther to the right than the amount you previously set by @code{scroll-left}. -@vindex automatic-hscrolling +@vindex hscroll-margin + The value of the variable @code{hscroll-margin} controls how close +to the window's edges point is allowed to get before the window will +be automatically scrolled. It is measured in columns. If the value +is 5, then moving point within 5 columns of the edge causes horizontal +scrolling away from that edge. + +@vindex hscroll-step + The variable @code{hscroll-step} determines how many columns to +scroll the window when point gets too close to the edge. If it's +zero, horizontal scrolling centers point horizontally within the +window. If it's a positive integer, it specifies the number of +columns to scroll by. If it's a floating-point number, it specifies +the fraction of the window's width to scroll by. The default is zero. + +@vindex auto-hscroll-mode To disable automatic horizontal scrolling, set the variable -@code{automatic-hscrolling} to @code{nil}. +@code{auto-hscroll-mode} to @code{nil}. + +@node Fringes +@section Window Fringes +@cindex fringes + + On a graphical display, each Emacs window normally has narrow +@dfn{fringes} on the left and right edges. The fringes display +indications about the text in the window. + + The most common use of the fringes is to indicate a continuation +line, when one line of text is split into multiple lines on the +screen. The left fringe shows a curving arrow for each screen line +except the first, indicating that ``this is not the real beginning.'' +The right fringe shows a curving arrow for each screen line except the +last, indicating that ``this is not the real end.'' + + The fringes indicate line truncation with short horizontal arrows +meaning ``there's more text on this line which is scrolled +horizontally out of view;'' clicking the mouse on one of the arrows +scrolls the display horizontally in the direction of the arrow. The +fringes also indicate other things such as empty lines, or where a +program you are debugging is executing (@pxref{Debuggers}). + +@findex set-fringe-style +@findex fringe-mode + You can enable and disable the fringes for all frames using +@kbd{M-x fringe-mode}. To enable and disable the fringes +for the selected frame, use @kbd{M-x set-fringe-style}. + +@node Useless Whitespace +@section Useless Whitespace + +@cindex trailing whitespace +@cindex whitespace, trailing +@vindex show-trailing-whitespace + It is easy to leave unnecessary spaces at the end of a line, or +empty lines at the end of a file, without realizing it. In most +cases, this @dfn{trailing whitespace} has no effect, but there are +special circumstances where it matters. + + You can make trailing whitespace at the end of a line visible on the +screen by setting the buffer-local variable +@code{show-trailing-whitespace} to @code{t}. Then Emacs displays +trailing whitespace in the face @code{trailing-whitespace}. + + This feature does not apply when point is at the end of the line +containing the whitespace. Strictly speaking, that is ``trailing +whitespace'' nonetheless, but displaying it specially in that case +looks ugly while you are typing in new text. In this special case, +the location of point is enough to show you that the spaces are +present. + +@findex delete-trailing-whitespace + To delete all trailing whitespace within the current buffer's +accessible portion (@pxref{Narrowing}), type @kbd{M-x +delete-trailing-whitespace @key{RET}}. (This command does not remove +the form-feed characters.) + +@vindex indicate-unused-lines +@vindex default-indicate-empty-lines +@cindex unused lines +@cindex fringes, and unused line indication + Emacs can indicate unused lines at the end of the window with a +small image in the left fringe (@pxref{Fringes}). The image appears +for window lines that do not correspond to any buffer text. Blank +lines at the end of the buffer then stand out because they do not have +this image in the fringe. + + To enable this feature, set the buffer-local variable +@code{indicate-unused-lines} to a non-@code{nil} value. The default +value of this variable is controlled by the variable +@code{default-indicate-unused-lines}; by setting that variable, you +can enable or disable this feature for all new buffers. (This feature +currently doesn't work on character terminals.) @node Follow Mode @section Follow Mode @@ -647,13 +766,23 @@ before the buffer percentage @var{pos}, with the letter @samp{L} to indicate what it is. @xref{Minor Modes}, for more information about minor modes and about how to use this command. +@cindex narrowing, and line number display + If you have narrowed the buffer (@pxref{Narrowing}), the displayed +line number is relative to the accessible portion of the buffer. + @vindex line-number-display-limit If the buffer is very large (larger than the value of @code{line-number-display-limit}), then the line number doesn't appear. Emacs doesn't compute the line number when the buffer is large, because -that would be too slow. Set it to @code{nil} to remove the limit. If -you have narrowed the buffer (@pxref{Narrowing}), the displayed line -number is relative to the accessible portion of the buffer. +that would be too slow. Set it to @code{nil} to remove the limit. + +@vindex line-number-display-limit-width + Line-number computation can also be slow if the lines in the buffer +are too long. For this reason, Emacs normally doesn't display line +numbers if the average width, in characters, of lines near point is +larger than the value of the variable +@code{line-number-display-limit-width}. The default value is 200 +characters. @cindex Column Number mode @cindex mode, Column Number @@ -686,43 +815,59 @@ to @code{t}. @cindex mail (on mode line) @vindex display-time-use-mail-icon @vindex display-time-mail-face +@vindex display-time-mail-file +@vindex display-time-mail-directory The word @samp{Mail} appears after the load level if there is mail for you that you have not read yet. On a graphical display you can use an icon instead of @samp{Mail} by customizing @code{display-time-use-mail-icon}; this may save some space on the mode line. You can customize @code{display-time-mail-face} to make the mail -indicator prominent. +indicator prominent. Use @code{display-time-mail-file} to specify +the mail file to check, or set @code{display-time-mail-directory} +to specify the directory to check for incoming mail (any nonempty regular +file in the directory is considered as ``newly arrived mail''). -@cindex mode line, 3D appearence +@cindex mode line, 3D appearance @cindex attributes of mode line, changing @cindex non-integral number of lines in a window - By default, the mode line is drawn on graphics displays as a 3D -released button. Depending on the font used for the mode line's text, -this might make the mode line use more space than a text line in a -window, and cause the last line of the window be partially obscured. -That is, the window displays a non-integral number of text lines. If -you don't like this effect, you can disable the 3D appearence of the -mode line by customizing the attributes of the @code{mode-line} face in -your @file{.emacs} init file, like this: + By default, the mode line is drawn on graphics displays with +3D-style highlighting, like that of a button when it is not being +pressed. If you don't like this effect, you can disable the 3D +highlighting of the mode line, by customizing the attributes of the +@code{mode-line} face in your @file{.emacs} init file, like this: @example - (set-face-attribute 'mode-line nil :box nil) +(set-face-attribute 'mode-line nil :box nil) @end example @noindent -Alternatively, you could turn off the box attribute in your +Alternatively, you can turn off the box attribute in your @file{.Xdefaults} file: @example - Emacs.mode-line.AttributeBox: off +Emacs.mode-line.AttributeBox: off @end example +@cindex non-selected windows, mode line appearance + By default, the mode line of nonselected windows is displayed in a +different face, called @code{mode-line-inactive}. Only the selected +window is displayed in the @code{mode-line} face. This helps show +which window is selected. When the minibuffer is selected, since +it has no mode line, the window from which you activated the minibuffer +has its mode line displayed using @code{mode-line}; as a result, +ordinary entry to the minibuffer does not change any mode lines. + +@vindex mode-line-in-non-selected-windows + You can disable use of @code{mode-line-inactive} by setting variable +@code{mode-line-in-non-selected-windows} to @code{nil}; then all mode +lines are displayed in the @code{mode-line} face. + @node Text Display @section How Text Is Displayed @cindex characters (in text) ASCII printing characters (octal codes 040 through 0176) in Emacs -buffers are displayed with their graphics. So are non-ASCII multibyte +buffers are displayed with their graphics, as are non-ASCII multibyte printing characters (octal codes above 0400). Some ASCII control characters are displayed in special ways. The @@ -738,7 +883,7 @@ control-A is displayed as @samp{^A}. octal escape sequences; thus, character code 0230 (octal) is displayed as @samp{\230}. The display of character codes 0240 through 0377 (octal) may be either as escape sequences or as graphics. They do not -normally occur in multibyte buffers but if they do, they are displayed +normally occur in multibyte buffers, but if they do, they are displayed as Latin-1 graphics. In unibyte mode, if you enable European display they are displayed using their graphics (assuming your terminal supports them), otherwise as escape sequences. @xref{Single-Byte Character @@ -754,10 +899,10 @@ users should skip it. The variable @code{mode-line-inverse-video} is an obsolete way of controlling whether the mode line is displayed in inverse video; the preferred way of doing this is to change the @code{mode-line} face. -@xref{Mode Line}. If you specify the foreground color for the -@code{mode-line} face, and @code{mode-line-inverse-video} is -non-@code{nil}, then the default background color for that face is the -usual foreground color. @xref{Faces}. +@xref{Mode Line}. However, if @code{mode-line-inverse-video} has a +value of @code{nil}, then the @code{mode-line} face will be ignored, +and mode-lines will be drawn using the default text face. +@xref{Faces}. @vindex inverse-video If the variable @code{inverse-video} is non-@code{nil}, Emacs attempts @@ -786,7 +931,7 @@ keys; its value is the number of seconds of pause required to cause echoing to start, or zero meaning don't echo at all. @xref{Echo Area}. @vindex ctl-arrow - If the variable @code{ctl-arrow} is @code{nil}, control characters in + If the variable @code{ctl-arrow} is @code{nil}, all control characters in the buffer are displayed with octal escape sequences, except for newline and tab. Altering the value of @code{ctl-arrow} makes it local to the current buffer; until that time, the default value is in effect. The @@ -847,35 +992,52 @@ or off, customize the group @code{cursor}. You can also control the amount of time Emacs must remain busy before the busy indicator is displayed, by setting the variable @code{hourglass-delay}. +@findex tty-suppress-bold-inverse-default-colors + On some text-only terminals, bold face and inverse video together +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 hl-line-mode @findex blink-cursor-mode +@vindex blink-cursor-alist @cindex cursor, locating visually @cindex cursor, blinking - There are a number of ways to customize the display of the cursor. -@kbd{M-x hl-line-mode} enables or disables a global minor mode which -highlights the line containing point. On window systems, the command -@kbd{M-x blink-cursor-mode} turns on or off the blinking of the -cursor. (On terminals, the terminal itself blinks the cursor, and -Emacs has no control over it.) - You can customize the cursor's color, and whether it blinks, using -the @code{cursor} Custom group (@pxref{Easy Customization}). +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 option @code{cursor-in-non-selected-windows} and assign +it a @code{nil} value. @vindex x-stretch-cursor @cindex wide block cursor - When displaying on a window system, 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. + 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. -@cindex cursor in non-selected windows -@vindex show-cursor-in-non-selected-windows -@vindex cursor-in-non-selected-windows - Normally, the cursor in non-selected windows is shown as a hollow box. -To turn off cursor display in non-selected windows, customize the option -@code{show-cursor-in-non-selected-windows}, or set the variable -@code{cursor-in-non-selected-windows} to @code{nil}. +@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