@panyam/tsutils/lib/esm/timer.js

Some basic TS utils for personal use

export class Timer {
    constructor(refreshInterval, stepFunc) {
        this.refreshInterval = 1000;
        this.lastRefreshAt = 0;
        this.updateLoop = null;
        this.refreshInterval = refreshInterval;
        this.stepFunc = stepFunc;
    }
    stop() {
        if (this.updateLoop != null) {
            cancelAnimationFrame(this.updateLoop);
            this.updateLoop = null;
        }
    }
    start() {
        this.kickOffUpdate();
    }
    kickOffUpdate() {
        if (this.updateLoop != null) {
            cancelAnimationFrame(this.updateLoop);
        }
        this.updateLoop = requestAnimationFrame((timestamp) => {
            if (this.updateLoop != null) {
                if (timestamp - this.lastRefreshAt >= this.refreshInterval) {
                    try {
                        this.stepFunc(timestamp);
                    }
                    catch (err) {
                        console.log("Error from Timer Handler: ", err);
                        alert("Error from Timer Handler: " + err.message);
                        return;
                    }
                    this.lastRefreshAt = timestamp;
                }
                this.updateLoop = null;
                this.kickOffUpdate();
            }
        });
    }
}
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