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How to Configure the Keyboard in Xorg
The keyboard of the Chromebook Acer C720 is probably good for walks on the network and work in the Chrome OS, but I do not have enough keys to write the programs. These are Home, End, PageUp, PageDown, Insert and Delete.
You can try using the Alt key (generates the Alt character) as a modifier for the cursor keys. Then the following keyboard combinations are obtained:
| Key | Combination |
|---|---|
| Insert | Alt + \ |
| Delete | Alt + BackSpace |
| Home | Alt + Left (←) |
| End | Alt + Right (→) |
| PageUp | Alt + Up (↑) |
| PageDown | Alt + Down (↓) |
To modify the layout use xkb. First, create a directory for the configuration files:
mkdir -p ${HOME}/.config/xkb/types ${HOME}/.config/xkb/symbols
In the file ${HOME}/.config/xkb/types/c720 we specify how the two modifiers will behave together - Shift and Alt. Interest is represented by situations when Alt is pressed, that is, level 3.
xkb_types "c720" {
virtual_modifiers Alt;
type "ARROW" {
modifiers = Shift+Alt;
map[Shift] = Level2;
map[Alt] = Level3;
map[Alt+Shift] = Level3;
level_name[Level1] = "Base";
level_name[Level2] = "Caps";
level_name[Level3] = "Alt";
};
};
In the file ${HOME}/.config/xkb/symbols/c720 at level 3, we perform a substitution of the keys for the required keys and do not forget to clear the modifier flag, otherwise the new characters will not be processed correctly.
xkb_symbols "c720" {
key <BKSL> {
type="ARROW",
repeat=yes,
symbol[Group1] = [backslash, bar, Insert],
symbol[Group2] = [backslash, slash, Insert],
actions[Group1] = [
NoAction(),
NoAction(),
RedirectKey(key=<INS>, clearmods=Alt)
],
actions[Group2] = [
NoAction(),
NoAction(),
RedirectKey(key=<INS>, clearmods=Alt)
]
};
key <BKSP> {
type="ARROW",
repeat=yes,
[BackSpace, BackSpace, Delete],
actions[Group1] = [
NoAction(),
NoAction(),
RedirectKey(key=<DELE>, clearmods=Alt)
]
};
key <LEFT> {
type="ARROW",
[Left, Left, Home],
actions[Group1] = [
NoAction(),
NoAction(),
RedirectKey(key=<HOME>, clearmods=Alt)
]
};
key <RGHT> {
type="ARROW",
repeat=yes,
[Right, Right, End],
actions[Group1] = [
NoAction(),
NoAction(),
RedirectKey(key=<END>, clearmods=Alt)
]
};
key <UP> {
type="ARROW",
repeat=yes,
[Up, Up, Prior],
actions[Group1] = [
NoAction(),
NoAction(),
RedirectKey(key=<PGUP>, clearmods=Alt)
]
};
key <DOWN> {
type="ARROW",
[Down, Down, Next],
actions[Group1] = [
NoAction(),
NoAction(),
RedirectKey(key=<PGDN>, clearmods=Alt)
]
};
};
It remains to write the following command in .xinitrc to load the changed layout:
setxkbmap -layout "us+c720" -types "complete+c720" -print|xkbcomp -I"$HOME/.config/xkb" - "${DISPLAY%%.*}"