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import {detectOsKind, OsKind} from "./os";
type ModifierKey = {
name: string
keyArg: string
}
class ModifierKeys {
static metaKey: ModifierKey = {name: "Command", keyArg: "Meta"}
static ctrlKey: ModifierKey = {name: "Ctrl", keyArg: "Control"}
static altKey: ModifierKey = {name: "Alt", keyArg: "Alt"}
static shiftKey: ModifierKey = {name: "Shift", keyArg: "Shift"}
}
const setOfKeys = [ModifierKeys.altKey, ModifierKeys.shiftKey, ModifierKeys.ctrlKey, ModifierKeys.metaKey]
export class Hotkey {
private readonly osKind: OsKind;
constructor() {
this.osKind = detectOsKind()
}
public getOsAccelKeyName() {
return this.getOsAccelKey().name
}
/**
* Register a hotkey of combination Accel key (Cmd/Ctrl depending on OS).
* The method also checks that other modifiers key is not pressed to avoid shortcuts intersection.
* E.g. don't trigger [Ctrl+K] if [Ctrl + Shift + K] pressed
*/
public registerHotkeyWithAccel = (event: () => void, letter: string) => {
const osMetaKey = this.getOsAccelKey()
document.onkeydown = (keyDownEvent) => {
const isMetaKeyPressed = keyDownEvent.getModifierState(osMetaKey.keyArg)
const isOtherModifierKeyPressed = setOfKeys
.filter(key => key !== osMetaKey)
.map((otherKeys: ModifierKey) => keyDownEvent.getModifierState(otherKeys.keyArg))
.some(value => value)
if (isMetaKeyPressed && !isOtherModifierKeyPressed && keyDownEvent.key === letter) {
keyDownEvent.preventDefault()
event()
}
};
}
private getOsAccelKey(): ModifierKey {
switch (this.osKind) {
case OsKind.MACOS:
return ModifierKeys.metaKey
default:
return ModifierKeys.ctrlKey
}
}
}
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