51 lines
1.8 KiB
JavaScript
51 lines
1.8 KiB
JavaScript
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import { BaseInput } from './base-input';
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export class Keyboard extends BaseInput {
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constructor(element) {
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super(element);
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this.keysDown = new Map();
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this.keysJustPressed = new Map();
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this.keysJustReleased = new Map();
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this.handleKeyDown = this.handleKeyDown.bind(this);
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this.handleKeyUp = this.handleKeyUp.bind(this);
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}
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capture(preventDefault) {
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this.active = true;
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this.preventDefault = preventDefault;
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this.element.addEventListener('keydown', this.handleKeyDown);
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this.element.addEventListener('keyup', this.handleKeyUp);
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}
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release() {
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this.active = false;
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this.element.removeEventListener('keydown', this.handleKeyDown);
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this.element.removeEventListener('keyup', this.handleKeyUp);
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}
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getState() {
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const state = {
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keysDown: new Map(this.keysDown),
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keysJustPressed: new Map(this.keysJustPressed),
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keysJustReleased: new Map(this.keysJustReleased)
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};
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this.keysJustPressed.clear();
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this.keysJustReleased.clear();
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return state;
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}
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handleKeyDown(event) {
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if (this.active && this.preventDefault)
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event.preventDefault();
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if (this.keysDown.get(event.keyCode))
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return;
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this.keysDown.set(event.keyCode, true);
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this.keysJustPressed.set(event.keyCode, true);
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this.keysJustReleased.set(event.keyCode, false);
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}
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handleKeyUp(event) {
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if (this.active && this.preventDefault)
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event.preventDefault();
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if (!this.keysDown.get(event.keyCode))
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return;
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this.keysDown.set(event.keyCode, false);
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this.keysJustPressed.set(event.keyCode, false);
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this.keysJustReleased.set(event.keyCode, true);
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}
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}
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