snappymail/dev/shortcuts.js
2022-11-21 13:20:59 +01:00

76 lines
1.9 KiB
JavaScript

(win => {
let
scope = {},
_scope = 'all';
const
doc = document,
// On Mac we use ⌘ else the Ctrl key
meta = /Mac OS X/.test(navigator.userAgent) ? 'meta' : 'ctrl',
_scopes = {
all: {}
},
toArray = v => Array.isArray(v) ? v : v.split(/\s*,\s*/),
exec = (event, cmd) => {
try {
// call the handler and stop the event if neccessary
if (!event.defaultPrevented && cmd(event) === false) {
event.preventDefault();
event.stopPropagation();
}
} catch (e) {
console.error(e);
}
},
shortcuts = {
on: () => doc.addEventListener('keydown', keydown),
off: () => doc.removeEventListener('keydown', keydown),
add: (keys, modifiers, scopes, method) => {
if (null == method) {
method = scopes;
scopes = 'all';
}
toArray(scopes).forEach(scope => {
if (!_scopes[scope]) {
_scopes[scope] = {};
}
toArray(keys).forEach(key => {
key = key.toLowerCase();
if (!_scopes[scope][key]) {
_scopes[scope][key] = {};
}
modifiers = toArray(modifiers)
.map(key => 'meta' == key ? meta : key)
.unique().sort().join('+');
if (!_scopes[scope][key][modifiers]) {
_scopes[scope][key][modifiers] = [];
}
_scopes[scope][key][modifiers].push(method);
});
});
},
setScope: value => {
_scope = value || 'all';
scope = _scopes[_scope] || {};
console.log('Shortcuts scope set to: ' + _scope);
},
getScope: () => _scope,
getMetaKey: () => 'meta' === meta ? '⌘' : 'Ctrl'
},
keydown = event => {
let key = (event.key || '').toLowerCase().replace(' ','space'),
modifiers = ['alt','ctrl','meta','shift'].filter(v => event[v+'Key']).join('+');
scope[key]?.[modifiers]?.forEach(cmd => exec(event, cmd));
!event.defaultPrevented && _scope !== 'all' && _scopes.all[key]?.[modifiers]?.forEach(cmd => exec(event, cmd));
};
win.shortcuts = shortcuts;
shortcuts.on();
})(this);