convex-pixel/esm2015/cpx/utils/sonar/sonar-detector.js

The library for creating pseudo 3d interactive scenes based on webgl

import * as PIXI from "pixi.js";
import { SonarEventTypes, Sonar } from "./sonar";
export class SonarDetector extends PIXI.utils.EventEmitter {
    constructor(_object, _detectedProps, _eventType = SonarEventTypes.CHANGE) {
        super();
        this._object = _object;
        this._detectedProps = _detectedProps;
        this._eventType = _eventType;
        this._snapshot = {};
        this._detectChangesHandler = (nextStep = false) => {
            this.detectChanges(nextStep);
        };
        this.startDetection();
    }
    detectChanges(nextStep = false) {
        if (nextStep) {
            this._detectChangesNextFrame();
            return;
        }
        if (!this._object) {
            this.emit(SonarEventTypes.LOST_CONTEXT);
            return;
        }
        if (!this.detectedProps) {
            throw Error(`Property "detectedProps" is not defined.`);
        }
        for (const prop of this.detectedProps) {
            const current = this._object;
            const previous = this._snapshot;
            if (current[prop] !== previous[prop]) {
                previous[prop] = current[prop];
                this.emit(this._eventType);
                break;
            }
        }
    }
    destroy() {
        this.stopDetection();
        this.removeAllListeners();
        this._object = undefined;
        this._snapshot = undefined;
        this._detectedProps = undefined;
    }
    startDetection() {
        Sonar.instance.add(this);
    }
    stopDetection() {
        clearTimeout(this._nextTimeoutId);
        if (Sonar.instance) {
            Sonar.instance.remove(this);
        }
    }
    get detectedProps() {
        return this._detectedProps;
    }
    get eventType() {
        return this._eventType;
    }
    _detectChangesNextFrame() {
        clearTimeout(this._nextTimeoutId);
        this._nextTimeoutId = setTimeout(this._detectChangesHandler, 0);
    }
}
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