git.r.bdr.sh - rbdr/forum/blob - src/lib/animations/blink.ts

   1 import { sineOut } from 'svelte/easing';
   2 import type { AnimationConfig } from 'svelte/animate';
   3
   4 export const blink = function blink(node: HTMLElement, params: AnimationConfig): AnimationConfig{
   5
   6   const originalWidth = parseFloat(getComputedStyle(node).width);
   7   const originalHeight = parseFloat(getComputedStyle(node).height);
   8
   9   return {
  10     delay: params.delay || 0,
  11     duration: params.duration || 400,
  12     easing: params.easing || sineOut,
  13     css: (t: number): string => {
  14
  15       const halfWidth = originalWidth / 2;
  16       const halfHeight = originalHeight / 2;
  17       const height = Math.round(t <= 0.2 ? (originalHeight * t) / 0.2 : originalHeight);
  18       const marginY = Math.round(t <= 0.2 ? halfHeight * (1 - t / 0.2) : 0);
  19       const width = Math.round(t > 0.2 ? ((t - 0.2) / 0.8) * originalWidth : 0);
  20       const marginX = Math.round(t > 0.2 ? (1 - (t - 0.2) / 0.8) * halfWidth : halfWidth);
  21
  22       return `width: ${width}px; height: ${height}px; margin: ${marginY}px ${marginX}px`;
  23     }
  24   };
  25 };