forked from arne/asdf-games
91 lines
1.7 KiB
JavaScript
91 lines
1.7 KiB
JavaScript
/**
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* KeyControls class
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*/
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class KeyControls {
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/**
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* Listens for keypresses and prevents default actions
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*/
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constructor() {
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this.keys = {};
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// Bind event handlers
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document.addEventListener("keydown", e => {
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if ([37, 38, 39, 40].indexOf(e.which) >= 0) {
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e.preventDefault();
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}
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this.keys[e.which] = true;
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}, false);
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document.addEventListener('keyup', e => {
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this.keys[e.which] = false;
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}, false);
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}
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/**
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* Returns value of action key (spacebar)
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* @returns {boolean} Key value
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*/
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get action() {
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// Spacebar
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return this.keys[32];
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}
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/**
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* Returns -1 on Arrow Left or A
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*
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* Returns 1 on Arrow Right or D
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* @returns {number} Key Value
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*/
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get x() {
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// Arrow Left or A (WASD)
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if (this.keys[37] || this.keys[65]) {
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return -1;
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}
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// Arrow Right or D (WASD)
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if (this.keys[39] || this.keys[68]) {
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return 1;
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}
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return 0;
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}
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/**
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* Returns -1 on Arrow Up or W
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*
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* Returns 1 on Arrow Down or S
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* @returns {number} Key value
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*/
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get y() {
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// Arrow Up or W (WASD)
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if (this.keys[38] || this.keys[87]) {
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return -1;
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}
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// Arrow Down or S (WASD)
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if (this.keys[40] || this.keys[83]) {
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return 1;
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}
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return 0;
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}
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/**
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* Read or write value of any key
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* @param {number} key Keycode for targetted key
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* @param {*} [value] Value to set to key
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* @return {*} Value of key
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*/
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key(key, value) {
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if (value !== undefined) {
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this.keys[key] = value;
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}
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return this.keys[key];
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}
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/**
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* Resets default value to all keys
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*/
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reset() {
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for (let key in this.keys) {
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this.keys[key] = false;
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}
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}
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}
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export default KeyControls;
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