devexpress-richedit/lib/common/canvas/double-tap-detector.js

DevExpress Rich Text Editor is an advanced word-processing tool designed for working with rich text documents.

export class DoubleTapDetector {
    constructor(maxDistance, maxInterval) {
        this.maxDistance = maxDistance;
        this.maxInterval = maxInterval;
        this.lastTime = null;
        this.lastX = -1;
        this.lastY = -1;
    }
    isDoubleTap(x, y) {
        const now = Date.now();
        const result = this.lastTime !== null &&
            (now - this.lastTime) < this.maxInterval &&
            Math.abs(x - this.lastX) <= this.maxDistance &&
            Math.abs(y - this.lastY) <= this.maxDistance;
        if (result) {
            this.reset();
        }
        else {
            this.lastTime = now;
            this.lastX = x;
            this.lastY = y;
        }
        return result;
    }
    reset() {
        this.lastTime = null;
    }
}