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class KeyboardHandler {
constructor() {
this.queue = [];
this.shortcuts = {};
}
on(combination, callback) {
this.shortcuts[combination] = callback;
}
listen() {
document.onkeydown = (event) => {
if (this.isEventIgnored(event) || this.isModifierKeyDown(event)) {
return;
}
let key = this.getKey(event);
this.queue.push(key);
for (let combination in this.shortcuts) {
let keys = combination.split(" ");
if (keys.every((value, index) => value === this.queue[index])) {
this.queue = [];
this.shortcuts[combination](event);
return;
}
if (keys.length === 1 && key === keys[0]) {
this.queue = [];
this.shortcuts[combination](event);
return;
}
}
if (this.queue.length >= 2) {
this.queue = [];
}
};
}
isEventIgnored(event) {
return event.target.tagName === "INPUT" || event.target.tagName === "TEXTAREA";
}
isModifierKeyDown(event) {
return event.getModifierState("Control") || event.getModifierState("Alt") || event.getModifierState("Meta");
}
getKey(event) {
const mapping = {
'Esc': 'Escape',
'Up': 'ArrowUp',
'Down': 'ArrowDown',
'Left': 'ArrowLeft',
'Right': 'ArrowRight'
};
for (let key in mapping) {
if (mapping.hasOwnProperty(key) && key === event.key) {
return mapping[key];
}
}
return event.key;
}
}
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