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         const originalWidth = parseFloat(getComputedStyle(node).width);
   6         const originalHeight = parseFloat(getComputedStyle(node).height);
   7
   8         return {
   9                 delay: params.delay || 0,
  10                 duration: params.duration || 400,
  11                 easing: params.easing || sineOut,
  12                 css: (t: number): string => {
  13                         const halfWidth = originalWidth / 2;
  14                         const halfHeight = originalHeight / 2;
  15                         const height = Math.round(t <= 0.2 ? (originalHeight * t) / 0.2 : originalHeight);
  16                         const marginY = Math.round(t <= 0.2 ? halfHeight * (1 - t / 0.2) : 0);
  17                         const width = Math.round(t > 0.2 ? ((t - 0.2) / 0.8) * originalWidth : 0);
  18                         const marginX = Math.round(t > 0.2 ? (1 - (t - 0.2) / 0.8) * halfWidth : halfWidth);
  19
  20                         return `width: ${width}px; height: ${height}px; margin: ${marginY}px ${marginX}px`;
  21                 }
  22         };
  23 };