@minix-iot/ui/dist/utils/inertia.js

基于Vue的移动端轻量级UI组件库

export class Inertia {
  static LIMIT_TIME = 300;

  static LIMIT_DISTANCE = 15;

  static Create() {
    return new Inertia();
  }

  constructor() {
    this.startTime = 0;
    this.startOffset = 0;

    this.endTime = 0;
    this.endOffset = 0;
  }

  get shouldActive() {
    return Math.abs(this.interval) < Inertia.LIMIT_TIME && Math.abs(this.distance) > Inertia.LIMIT_DISTANCE;
  }

  get interval() {
    return this.endTime - this.startTime;
  }

  get distance() {
    return this.endOffset - this.startOffset;
  }

  get speed() {
    return this.distance / this.interval;
  }

  start(startOffset, startTime = Date.now()) {
    this.startOffset = startOffset;
    this.startTime = startTime;
  }

  end(endOffset, endTime = Date.now()) {
    this.endOffset = endOffset;
    this.endTime = endTime;
  }
}