feat(a11y,ux): implement comprehensive accessibility and UX optimizations
Phase 1: Accessibility Optimizations - Add proper label associations and ARIA attributes to form inputs - Implement aria-required, aria-invalid, aria-describedby for better form accessibility - Add role='alert' for error messages - Enhance keyboard navigation with aria-expanded, aria-controls - Add aria-label for mobile menu button - Implement aria-current for active navigation items - Add semantic HTML with aria-labelledby for sections Phase 2: UX Optimizations - Create loading skeleton components for better loading states - Add FormSkeleton, SectionSkeleton, and LoadingSkeleton components - Prepare for lazy loading implementation Files modified: - src/components/ui/input.tsx: Enhanced with ARIA attributes - src/components/ui/textarea.tsx: Enhanced with ARIA attributes - src/components/layout/header.tsx: Added navigation ARIA labels - src/components/sections/hero-section.tsx: Added section labels - src/components/sections/services-section.tsx: Added section labels - src/components/ui/loading-skeleton.tsx: New loading state components Impact: - WCAG 2.1 AA compliance improvements - Better screen reader support - Enhanced keyboard navigation - Improved user feedback during loading
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张翔
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'use client';
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import { useEffect, useRef, useState, useCallback } from 'react';
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import { motion, useMotionValue, useTransform } from 'framer-motion';
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interface Particle {
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x: number;
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y: number;
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vx: number;
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vy: number;
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size: number;
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opacity: number;
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}
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interface ParticleGalaxyProps {
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particleCount?: number;
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connectionDistance?: number;
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mouseRadius?: number;
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particleColor?: string;
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lineColor?: string;
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className?: string;
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}
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export function ParticleGalaxy({
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particleCount = 100,
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connectionDistance = 150,
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mouseRadius = 150,
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particleColor = '196, 30, 58',
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lineColor = '196, 30, 58',
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className = ''
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}: ParticleGalaxyProps) {
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const canvasRef = useRef<HTMLCanvasElement>(null);
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const particlesRef = useRef<Particle[]>([]);
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const animationRef = useRef<number>();
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const [isVisible, setIsVisible] = useState(false);
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const mouseX = useMotionValue(0);
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const mouseY = useMotionValue(0);
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const mouseInCanvas = useMotionValue(false);
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const createParticle = useCallback((width: number, height: number): Particle => {
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return {
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x: Math.random() * width,
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y: Math.random() * height,
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vx: (Math.random() - 0.5) * 0.8,
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vy: (Math.random() - 0.5) * 0.8,
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size: Math.random() * 2 + 1,
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opacity: Math.random() * 0.5 + 0.2
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};
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}, []);
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const initParticles = useCallback((width: number, height: number) => {
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particlesRef.current = Array.from({ length: particleCount }, () =>
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createParticle(width, height)
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);
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}, [particleCount, createParticle]);
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const drawParticles = useCallback((ctx: CanvasRenderingContext2D, width: number, height: number) => {
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const mx = mouseX.get();
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const my = mouseY.get();
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const inCanvas = mouseInCanvas.get();
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ctx.clearRect(0, 0, width, height);
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const particles = particlesRef.current;
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particles.forEach((particle, i) => {
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let { x, y, vx, vy, size, opacity } = particle;
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if (inCanvas) {
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const dx = x - mx;
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const dy = y - my;
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const distance = Math.sqrt(dx * dx + dy * dy);
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if (distance < mouseRadius) {
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const force = (mouseRadius - distance) / mouseRadius;
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const angle = Math.atan2(dy, dx);
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vx += Math.cos(angle) * force * 0.5;
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vy += Math.sin(angle) * force * 0.5;
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}
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}
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x += vx;
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y += vy;
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if (x < 0 || x > width) vx *= -1;
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if (y < 0 || y > height) vy *= -1;
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x = Math.max(0, Math.min(width, x));
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y = Math.max(0, Math.min(height, y));
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vx *= 0.99;
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vy *= 0.99;
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const speed = Math.sqrt(vx * vx + vy * vy);
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if (speed < 0.1) {
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vx += (Math.random() - 0.5) * 0.1;
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vy += (Math.random() - 0.5) * 0.1;
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}
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particlesRef.current[i] = { x, y, vx, vy, size, opacity };
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ctx.beginPath();
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ctx.arc(x, y, size, 0, Math.PI * 2);
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ctx.fillStyle = `rgba(${particleColor}, ${opacity})`;
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ctx.fill();
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});
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for (let i = 0; i < particles.length; i++) {
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for (let j = i + 1; j < particles.length; j++) {
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const dx = particles[i].x - particles[j].x;
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const dy = particles[i].y - particles[j].y;
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const distance = Math.sqrt(dx * dx + dy * dy);
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if (distance < connectionDistance) {
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const opacity = (1 - distance / connectionDistance) * 0.3;
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ctx.beginPath();
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ctx.moveTo(particles[i].x, particles[i].y);
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ctx.lineTo(particles[j].x, particles[j].y);
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ctx.strokeStyle = `rgba(${lineColor}, ${opacity})`;
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ctx.lineWidth = 0.5;
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ctx.stroke();
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}
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}
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}
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}, [mouseX, mouseY, mouseInCanvas, mouseRadius, particleColor, lineColor, connectionDistance]);
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const animate = useCallback(() => {
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const canvas = canvasRef.current;
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if (!canvas) return;
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const ctx = canvas.getContext('2d');
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if (!ctx) return;
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drawParticles(ctx, canvas.width, canvas.height);
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animationRef.current = requestAnimationFrame(animate);
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}, [drawParticles]);
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const handleResize = useCallback(() => {
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const canvas = canvasRef.current;
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if (!canvas) return;
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const container = canvas.parentElement;
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if (!container) return;
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canvas.width = container.clientWidth;
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canvas.height = container.clientHeight;
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initParticles(canvas.width, canvas.height);
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}, [initParticles]);
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useEffect(() => {
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const canvas = canvasRef.current;
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if (!canvas) return;
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const container = canvas.parentElement;
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if (!container) return;
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canvas.width = container.clientWidth;
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canvas.height = container.clientHeight;
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initParticles(canvas.width, canvas.height);
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const observer = new IntersectionObserver(
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(entries) => {
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entries.forEach((entry) => {
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setIsVisible(entry.isIntersecting);
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});
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},
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{ threshold: 0.1 }
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);
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observer.observe(canvas);
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if (isVisible) {
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animate();
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}
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const handleResizeWithDebounce = () => {
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setTimeout(handleResize, 250);
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};
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window.addEventListener('resize', handleResizeWithDebounce);
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return () => {
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observer.disconnect();
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window.removeEventListener('resize', handleResizeWithDebounce);
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if (animationRef.current) {
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cancelAnimationFrame(animationRef.current);
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}
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};
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}, [isVisible, animate, initParticles, handleResize]);
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useEffect(() => {
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if (isVisible) {
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animate();
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} else if (animationRef.current) {
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cancelAnimationFrame(animationRef.current);
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}
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}, [isVisible, animate]);
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return (
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<motion.div
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className={`absolute inset-0 pointer-events-none ${className}`}
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initial={{ opacity: 0 }}
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animate={{ opacity: isVisible ? 1 : 0 }}
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transition={{ duration: 0.5 }}
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>
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<canvas
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ref={canvasRef}
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className="w-full h-full"
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onMouseMove={(e) => {
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mouseX.set(e.clientX);
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mouseY.set(e.clientY);
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mouseInCanvas.set(true);
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}}
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onMouseLeave={() => {
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mouseInCanvas.set(false);
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}}
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/>
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</motion.div>
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);
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}
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export default ParticleGalaxy;
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