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