切换键盘布局
A keyboard layout maps scancodes from a keyboard into characters sent to an application.
An appropriate keyboard layout is required to support both QWERTY and non-QWERTY keyboards, to enter characters outside of ASCII set.
Keyboard layouts can also do more complex transformations, e.g. via so called dead keys which do not output characters on their own, but modify output of subsequent keys.
文字模式
OpenRC
The default console keymap is set in /etc/conf.d/keymaps by assigning the appropriate keymap as the value for keymap. The keymap values are defined in /usr/share/keymaps, and most users will use a value from /usr/share/keymaps/i386/qwerty/. Optionally, set the value for the extended_keymaps variable from the appropriate include directory, like /usr/share/keymaps/i386/include. For example, set extended_keymaps="euro2" to get Euro and cent with Alt-Gr on the positions where many keyboards have E and C.
keymap="us"
extended_keymaps=""
最后将 /etc/init.d/keymaps 添加到引导运行级别。
root #
rc-update add keymaps boot
If you need the terminal show non-ASCII characters you must edit /etc/conf.d/consolefont and change font:
consolefont="cyr-sun16"
Restart the consolefont service and add it to boot runlevel:
root #
rc-service consolefont restart
root #
rc-update add consolefont boot
自定义键盘映射
要自定义键盘映射,请查看 /usr/share/keymaps 中提供的键盘映射:
user $
vi <keymap file>.map
user $
gzip <keymap file>.map
root #
mv <keymap file>.map /usr/share/keymaps/<some directory>
这是一个自定义键盘映射的示例,它与美国 QWERTY 键盘映射相同,除了正斜杠(/)和撇号键(')被交换:
include "us.map"
keycode 40 = slash question
keycode 53 = apostrophe quotedbl
键码可能因系统而异。
要查找映射到键的键码,请查看 dumpkeys 的输出:
user $
dumpkeys -l
如果使用上述命令找不到相应按键,运行:
user $
showkey
只需按下相应键,就会显示其键码。完成后等待几秒钟,showkey 将关闭。
systemd
systemd uses /etc/vconsole.conf and includes both terminal font and keyboard layout settings but lacks advanced settings found in OpenRC. Valid values should match what OpenRC supports for the corresponding variable.
KEYMAP=pl2
FONT=LatArCyrHeb-16
X11
Modern X11 applications usually use x11-libs/libxklavier ("klavier" being German for "keyboard") and can be configured by using setxkbmap. Furthermore X11 supports much broader sets of keyboard layouts than is supported for virtual terminals.
It should be kept in mind that a proper desktop environment will do its own keyboard layout management. There is no need to directly use the aforementioned application but it can come in handy when dealing with broken or lacking keyboard layout management.
KDE4 / Plasma
打开 System Settings 并导航到 Input Devices 模块。
To make additional languages available in the SDDM login manager, follow instructions on adding custom keymap.
通用桌面环境
Edit ~/.xprofile and call setxkbmap from there or setup the keyboard in Xorg configuration file (see below for examples).
Recent versions of GNOME 3 do not use x11-libs/libxklavier any more therefore this might not work at all or likely get overridden by GNOME. Similarly any other desktop environment might also override the x11-libs/libxklavier configuration as part of the initialization or layout change.
通用 X11
使用 setxkbmap
These changes are non-permanent and will persist only as long as the user does not restart X11. Naturally the command can be called from a startup script to set the appropriate parameters on every start of the X server.
查询现有配置:
user $
setxkbmap -query
设置键盘布局:
user $
setxkbmap lv
设置键盘布局、其变体和型号:
user $
setxkbmap lv apostrophe -model logiultrax
设置两种带 LED 指示的键盘布局:
user $
setxkbmap -layout us,ru -option grp:shifts_toggle -option grp_led:caps
It is advised to read xkeyboard-config
manual for a full list of keyboard configuration options:
user $
LESS=--chop-long-lines man xkeyboard-config
Finding the supported layouts and variants or values of other xkb properties does not appear to be possible with this application, although most of them are listed in the /usr/share/X11/xkb/rules/base.lst file. To get the most complete list seems to be possible only by examining other files in /usr/share/X11/xkb/. For sake of sanity, it is advised to use of a proper desktop environment with its own keyboard layout management.
Using system-wide configured layouts and shortcut
This method is recommended for configurations without desktop environments, in other words just X11 with a window manager. Since Gnome removed the ability to change the Keyboard layouts in GDM using the gnome-control-center, GDM also relies on this method on systems without systemd. Create the 10-keyboard.conf file and configure it with the appropriate keyboard settings. Create the directory /etc/X11/xorg.conf.d if it does not exist.
Section "InputClass"
Identifier "keyboard-all"
Driver "evdev"
Option "XkbLayout" "us,br"
Option "XkbVariant" ",abnt2"
Option "XkbOptions" "grp:shifts_toggle,grp_led:scroll"
MatchIsKeyboard "on"
EndSection
The example above configures US and Brazilian keyboard layouts with Left Shift+Right Shift as shortcut to alternate between them. Brazilian layout is signalled by Scroll Lock LED on the keyboard.
When using a Cyrillic language layout and the keyboard has “Windows®” keys, it may be necessary to add responsive
",winkeys"
to XkbVariant
option.Additional configuration possibilities
There are a number of variants and options available which can be used while configuring the keyboard mappings. Most of those can be found in the /usr/share/X11/xkb/rules/base.lst file.
For example, the US layout with possibility to write some international characters can be configured by using the variant altgr-intl
:
...
Option "XkbLayout" "us,br"
Option "XkbVariant" "altgr-intl,abnt2"
...
Right Alt is then used as a modifier for typing international characters.
Xorg provides the option to type international and various symbol characters by composition - which means by pressing compose key followed by a sequence of characters. To enable composition add the compose:<compose_key>
option:
...
Option "XkbOptions" "grp:shifts_toggle,grp_led:scroll,compose:sclk"
...
The compose:sclk
option above configures Scroll Lock as compose key. With this setting:
- Press Scroll Lock then type 'oo' to get degree sign '°'
- Press Scroll Lock then type 'oc' to get copyright sign '©'
- Press Scroll Lock then type ':)' to get smiling face '☺'
- Press Scroll Lock then type '^2' to get superscript 2 ('²')
- Press Scroll Lock then type '_2' to get subscript 2 ('₂')
- Press Scroll Lock then type 'di' to get diameter sign '⌀'
... and many more. The /usr/share/X11/locale/compose.dir file lists all possible composition sources.
Enhancing an X keyboard layout
This is necessary when more far-reaching changes have to be made to the keyboard layout, such as adding key assignments, or adding actions to function keys. Since such changes are actually enhancements to the source files of a package, it is recommended to use the User patching mechanism so that these amendments are preserved when the package is next updated.
The fundamentals
The relevant Gentoo package is x11-misc/xkeyboard-config. Configuring a keyboard under X is more complicated than doing the same for a virtual console. The pertinent configuration files can be found in /usr/share/X11/xkb in these subdirectories:
- keycodes
- These files associate key codes with symbolic names - it is unlikely that anyone wants to change this.
- geometry
- This is the physical shape of the keyboard, used by some software for drawing diagrams of it - it is also unlikely that anyone wants to change this.
- types
- The files here create "types". Used in a key declaration, a type specifies which combinations of shift keys can be used with the key.
- symbols
- These files specify the actual key assignments.
- compat
- The files here specify "actions" (such as switching to a virtual terminal), giving them names, which can be assigned to keys.
- rules
- These files, given parameters such as the keyboard type, and a language, activate the appropriate specifications in the other directories.
A fuller description of the files in these directories can be found at An Unreliable Guide to XKB Configuration by Doug Palmer. It is a lot better than its name suggests. Further documentation can be found at xkeyboard-config's home page at freedesktop.org.
Xkb gives keys names like "<AC01>" which means "key in the Alphanumeric area, in row C (i.e. third row from the bottom, the row CapsLock is on), and key number 01, the first key at the left of the row". This key is A in an English layout. Keys in other areas have other names, such as "<FK05>" for F5, or "<LCTL>" for the left control key.
Adding key assignments
As an example, this section will enhance the British English keyboard layout such that typing a, o, or u with AltGr will generate the German umlaut letters ä, ö, and ü. It should also do the Right Thing for the upper case versions. The keys to enhance are A (<AC01>), O (<AD09>) and U (<AD07>). (The character ß is already assigned to AltGr+S.)
The names of the umlauted letters in xkb are "adiaeresis" and so on. These names can be found in the file /usr/include/X11/keysymdef.h, though the leading "XK_"s have to be removed to get the names.
Identify the right file in the symbols directory. Most of these files are named as two letter country codes (such as gb for Great Britain) so guess the one which matches the keyboard layout currently selected in X. In this example, symbols/gb is enhanced.
With the information above, create new entries by copying the existing scheme in symbols/gb. In this example, these entries should be added into the section called "basic". From its content, it is easy to guess that the four items in the braces and brackets within the entry for each key are for regular (without other key combinations), Shift, AltGr, and Shift+AltGr respectively:
key <AE02> { [ 2, quotedbl, twosuperior, oneeighth] };
After making the additions, the section looks like this:
default partial alphanumeric_keys
xkb_symbols "basic" {
// Describes the differences between a very simple en_US
// keyboard and a very simple U.K. keyboard layout defined by
// the SVR4 European Language Supplement and sometimes also
// known as the IBM 166 layout.
include "latin"
name[Group1]="English (UK)";
key <AE02> { [ 2, quotedbl, twosuperior, oneeighth ] };
key <AE03> { [ 3, sterling, threesuperior, sterling ] };
key <AE04> { [ 4, dollar, EuroSign, onequarter ] };
key <AC11> { [apostrophe, at, dead_circumflex, dead_caron] };
key <TLDE> { [ grave, notsign, bar, bar ] };
key <BKSL> { [numbersign, asciitilde, dead_grave, dead_breve ] };
key <LSGT> { [ backslash, bar, bar, brokenbar ] };
// Keys inserted by ACM, 2015-10-23.
key <AD07> { [ u, U, udiaeresis, Udiaeresis ] };
key <AD09> { [ o, O, odiaeresis, Odiaeresis ] };
key <AC01> { [ a, A, adiaeresis, Adiaeresis ] };
// End of insertion 2015-10-23
include "level3(ralt_switch_multikey)"
};
Having saved this file, restart X Windows. A typical desktop environment, XFCE, re-reads the above configuration files each time it starts. Should there be errors, error messages will be written to the normal stderr - if X Windows is started from the command line, stderr will be the virtual terminal it was started from.
Adding actions to function keys
As an example, add the actions "switch to virtual terminal n" (where n > 12) to the function keys F1 - F12 when Ctrl, Alt, and Shift are all selected. The same effect should also occur when AltGr and Fn are selected.
First, search for the file in the symbols directory which handles the existing assignments for the Function keys. This file is symbols/srvr_ctrl. The entry in this file for F1, which is intended to be modified, is:
key <FK01> {
type="CTRL+ALT",
symbols[Group1]= [ F1, F1, F1, F1, XF86_Switch_VT_1 ]
};
There are two things to note with this entry:
- It is of type "CTRL+ALT"; it thus takes the standard four shift key settings with Shift and AltGr, plus a fifth setting of Ctrl+Alt. Since the goal is to use Ctrl+Alt+Shift, and there is no suitable existing type, a new one needs to be created.
- The "action"
XF86_Switch_VT_1
is just a defined symbol in the xkb system. Its semantics are given to it by an entry in a file in the compat directory, namely compat/xfree86. There is no symbolXF86_Switch_VT_13
(or higher) - instead, steal the otherwise unused existing symbols F13, F14, ..., F24.
Creating the new type CTRL+ALT+SHIFT
Having located "CTRL+ALT" in types/pc, it is easy enough to copy it, rename the copy to "CTRL+ALT+SHIFT" and extend this to allow the modifier key combination Ctrl+Alt+Shift. The result looks like this:
type "CTRL+ALT+SHIFT" {
modifiers = Control+Alt+Shift+LevelThree;
map[None] = Level1;
map[Shift] = Level2;
map[LevelThree] = Level3;
map[Shift+LevelThree] = Level4;
map[Control+Alt] = Level5;
map[Shift+Control+Alt] = Level6;
preserve[Shift] = Shift;
preserve[Shift+LevelThree] = Shift;
level_name[Level1] = "Base";
level_name[Level2] = "Shift";
level_name[Level3] = "Alt Base";
level_name[Level4] = "Shift Alt";
level_name[Level5] = "Ctrl+Alt";
level_name[Level6] = "Ctrl+Alt+Shift";
};
Activating the symbols F13, ..., F24
The symbol XF86_Switch_VT_1
is swiftly located in compat/xfree86. It is a simple matter to copy its form, creating assignments for the symbols F13, ..., F24. The definition for the first of these symbols, F13, in compat/xfree86 then looks like:
interpret F13 {
action = SwitchScreen(Screen=13, !SameServer);
};
Analogous definitions for F14, ..., F24 should also be put into the file.
Amending the entries in symbols for keys F1, ..., F12
Now that the new type CTRL+ALT+SHIFT and definitions for the symbols F13, ..., F24 are defined, amend the key definitions for the function keys in symbols/srvr_ctrl. The one for F1 is mentioned below, analogous definitions also need to be inserted for the other function keys:
key <FK01> {
type="CTRL+ALT+SHIFT",
symbols[Group1]= [ F1, F1, F13, F1, XF86_Switch_VT_1, F13 ]
};
After making these changes to types/pc, compat/xfree86, and symbols/srvr_ctrl, and restarting the X server, switching from X directly to virtual terminals 13 and above is now possible - provided that these have been configured in the /etc/inittab (or systemd equivalent) of course.
See also
- Key repeat rate — controls how quickly a key press on the keyboard will repeat if the key is pressed and held for a period of time.