69 lines
1.7 KiB
JavaScript
69 lines
1.7 KiB
JavaScript
class KeyboardHandler {
|
|
constructor() {
|
|
this.queue = [];
|
|
this.shortcuts = {};
|
|
}
|
|
|
|
on(combination, callback) {
|
|
this.shortcuts[combination] = callback;
|
|
}
|
|
|
|
listen() {
|
|
document.onkeydown = (event) => {
|
|
if (this.isEventIgnored(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.execute(combination, event);
|
|
return;
|
|
}
|
|
|
|
if (keys.length === 1 && key === keys[0]) {
|
|
this.execute(combination, event);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (this.queue.length >= 2) {
|
|
this.queue = [];
|
|
}
|
|
};
|
|
}
|
|
|
|
execute(combination, event) {
|
|
event.preventDefault();
|
|
event.stopPropagation();
|
|
|
|
this.queue = [];
|
|
this.shortcuts[combination](event);
|
|
}
|
|
|
|
isEventIgnored(event) {
|
|
return event.target.tagName === "INPUT" || event.target.tagName === "TEXTAREA";
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|