380 lines
12 KiB
TypeScript
380 lines
12 KiB
TypeScript
"use client";
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import { useState, useRef, useEffect } from "react";
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import {
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HERO_CONFIG,
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BENEFITS_CONFIG,
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CURRICULUM_CONFIG,
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CTA_CONFIG,
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INSTRUCTORS_CONFIG,
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} from "@/config/course";
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type Props = { title?: string; url?: string; className?: string };
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const POSTER_WIDTH = 750;
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const POSTER_HEIGHT = 1334;
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/** 使用公共 API 生成二维码图片，无需 npm 包 */
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async function getQRImage(url: string, size: number): Promise<HTMLImageElement | null> {
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const encoded = encodeURIComponent(url);
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const apiUrl = `https://api.qrserver.com/v1/create-qr-code/?size=${size}x${size}&data=${encoded}&format=png&bgcolor=0f172a&color=22d3ee`;
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return new Promise((resolve) => {
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const img = new Image();
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img.crossOrigin = "anonymous";
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img.onload = () => resolve(img);
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img.onerror = () => resolve(null);
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img.src = apiUrl;
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});
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}
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function wrapText(
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ctx: CanvasRenderingContext2D,
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text: string,
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x: number,
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y: number,
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maxWidth: number,
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lineHeight: number
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): number {
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const words = text.split("");
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let line = "";
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let lineCount = 0;
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for (const char of words) {
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const test = line + char;
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const m = ctx.measureText(test);
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if (m.width > maxWidth && line) {
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ctx.fillText(line, x, y + lineCount * lineHeight);
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lineCount++;
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line = char;
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} else {
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line = test;
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}
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}
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if (line) {
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ctx.fillText(line, x, y + lineCount * lineHeight);
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lineCount++;
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}
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return lineCount * lineHeight;
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}
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export function ShareButton({ title = HERO_CONFIG.title, url, className = "" }: Props) {
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const [open, setOpen] = useState(false);
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const [ready, setReady] = useState(false);
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const canvasRef = useRef<HTMLCanvasElement>(null);
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const getShareUrl = () => url || (typeof window !== "undefined" ? window.location.origin : "");
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const drawPoster = async () => {
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const canvas = canvasRef.current;
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if (!canvas || typeof window === "undefined") return;
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const ctx = canvas.getContext("2d");
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if (!ctx) return;
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const shareUrl = getShareUrl();
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const dpr = Math.min(window.devicePixelRatio || 1, 2);
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canvas.width = POSTER_WIDTH * dpr;
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canvas.height = POSTER_HEIGHT * dpr;
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ctx.scale(dpr, dpr);
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const w = POSTER_WIDTH;
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const h = POSTER_HEIGHT;
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const cyan = "#22d3ee";
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const cyanDim = "rgba(34,211,238,0.6)";
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const white = "#f8fafc";
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const muted = "rgba(248,250,252,0.7)";
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const dark = "#0f172a";
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const cardBg = "rgba(15,23,42,0.8)";
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// ========== 背景：深色科技感 ==========
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const bgGrad = ctx.createLinearGradient(0, 0, w, h);
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bgGrad.addColorStop(0, "#020617");
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bgGrad.addColorStop(0.4, "#0f172a");
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bgGrad.addColorStop(0.8, "#0c4a6e");
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bgGrad.addColorStop(1, "#0e7490");
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ctx.fillStyle = bgGrad;
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ctx.fillRect(0, 0, w, h);
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// 网格线
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ctx.strokeStyle = "rgba(34,211,238,0.06)";
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ctx.lineWidth = 1;
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const gridStep = 40;
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for (let i = 0; i <= w; i += gridStep) {
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ctx.beginPath();
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ctx.moveTo(i, 0);
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ctx.lineTo(i, h);
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ctx.stroke();
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}
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for (let i = 0; i <= h; i += gridStep) {
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ctx.beginPath();
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ctx.moveTo(0, i);
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ctx.lineTo(w, i);
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ctx.stroke();
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}
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// 顶部光晕
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const glow = ctx.createRadialGradient(w / 2, 0, 0, w / 2, 0, 400);
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glow.addColorStop(0, "rgba(34,211,238,0.15)");
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glow.addColorStop(0.5, "rgba(34,211,238,0.04)");
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glow.addColorStop(1, "transparent");
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ctx.fillStyle = glow;
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ctx.fillRect(0, 0, w, 350);
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// 底部光晕
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const glowBot = ctx.createRadialGradient(w / 2, h, 0, w / 2, h, 350);
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glowBot.addColorStop(0, "rgba(34,211,238,0.12)");
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glowBot.addColorStop(1, "transparent");
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ctx.fillStyle = glowBot;
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ctx.fillRect(0, h - 400, w, 400);
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// ========== 顶部：标题区 ==========
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ctx.fillStyle = cyan;
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ctx.font = "bold 38px sans-serif";
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ctx.textAlign = "center";
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ctx.fillText("🌍 " + title, w / 2, 88);
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ctx.font = "20px sans-serif";
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ctx.fillStyle = muted;
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ctx.textAlign = "left";
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wrapText(ctx, HERO_CONFIG.subtitle, 48, 128, 654, 26);
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ctx.textAlign = "center";
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// 分隔线
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ctx.strokeStyle = "rgba(34,211,238,0.3)";
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ctx.lineWidth = 1;
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ctx.beginPath();
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ctx.moveTo(60, 168);
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ctx.lineTo(w - 60, 168);
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ctx.stroke();
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// ========== 数据卡片 ==========
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const cardY = 192;
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const cardW = 210;
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const cardH = 68;
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const cardGap = (w - cardW * 3) / 4;
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HERO_CONFIG.stats.forEach((s, i) => {
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const x = cardGap + i * (cardW + cardGap);
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ctx.fillStyle = cardBg;
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ctx.strokeStyle = "rgba(34,211,238,0.25)";
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ctx.lineWidth = 1;
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ctx.beginPath();
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ctx.roundRect(x, cardY, cardW, cardH, 10);
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ctx.fill();
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ctx.stroke();
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ctx.fillStyle = cyan;
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ctx.font = "bold 26px sans-serif";
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ctx.textAlign = "center";
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ctx.fillText(s.value, x + cardW / 2, cardY + 36);
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ctx.font = "13px sans-serif";
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ctx.fillStyle = muted;
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ctx.fillText(s.label, x + cardW / 2, cardY + 56);
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});
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ctx.textAlign = "center";
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// ========== 学完你将获得 ==========
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let y = 290;
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ctx.font = "bold 18px sans-serif";
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ctx.fillStyle = white;
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ctx.fillText(BENEFITS_CONFIG.title, w / 2, y);
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y += 28;
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ctx.font = "13px sans-serif";
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ctx.fillStyle = muted;
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ctx.fillText(BENEFITS_CONFIG.subtitle, w / 2, y);
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y += 32;
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BENEFITS_CONFIG.items.forEach((item) => {
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ctx.fillStyle = cardBg;
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ctx.strokeStyle = "rgba(34,211,238,0.15)";
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ctx.lineWidth = 1;
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ctx.beginPath();
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ctx.roundRect(48, y, w - 96, 40, 8);
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ctx.fill();
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ctx.stroke();
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ctx.fillStyle = cyanDim;
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ctx.font = "15px sans-serif";
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ctx.textAlign = "left";
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ctx.fillText(`${item.num}. ${item.title}`, 64, y + 26);
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ctx.textAlign = "center";
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y += 48;
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});
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// ========== 课程模块 ==========
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y += 16;
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ctx.font = "bold 18px sans-serif";
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ctx.fillStyle = white;
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ctx.fillText(CURRICULUM_CONFIG.title, w / 2, y);
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y += 26;
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ctx.font = "13px sans-serif";
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ctx.fillStyle = muted;
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ctx.fillText(CURRICULUM_CONFIG.subtitle, w / 2, y);
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y += 32;
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const cols = 2;
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const modW = (w - 96 - 12) / cols;
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CURRICULUM_CONFIG.modules.forEach((m, i) => {
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const col = i % cols;
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const row = Math.floor(i / cols);
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const mx = 48 + col * (modW + 12);
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const my = y + row * 44;
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ctx.fillStyle = cardBg;
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ctx.strokeStyle = "rgba(34,211,238,0.12)";
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ctx.lineWidth = 1;
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ctx.beginPath();
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ctx.roundRect(mx, my, modW, 38, 6);
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ctx.fill();
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ctx.stroke();
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ctx.fillStyle = white;
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ctx.font = "14px sans-serif";
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ctx.textAlign = "left";
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ctx.fillText(`${m.emoji} ${m.title}`, mx + 12, my + 24);
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ctx.textAlign = "center";
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});
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y += Math.ceil(CURRICULUM_CONFIG.modules.length / cols) * 44 + 20;
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// ========== 徽章 ==========
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ctx.font = "15px sans-serif";
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ctx.fillStyle = cyanDim;
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ctx.fillText("✓ " + CTA_CONFIG.badges.join(" · "), w / 2, y);
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y += 44;
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// ========== 导师 ==========
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ctx.font = "13px sans-serif";
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ctx.fillStyle = muted;
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ctx.fillText(INSTRUCTORS_CONFIG.subtitle, w / 2, y);
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y += 32;
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// ========== 二维码区 ==========
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const qrSize = 200;
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const qrX = (w - qrSize) / 2;
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const qrY = y;
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const qrImg = await getQRImage(shareUrl, qrSize);
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if (qrImg) {
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ctx.fillStyle = cardBg;
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ctx.strokeStyle = "rgba(34,211,238,0.4)";
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ctx.lineWidth = 2;
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ctx.beginPath();
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ctx.roundRect(qrX - 10, qrY - 10, qrSize + 20, qrSize + 20, 12);
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ctx.fill();
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ctx.stroke();
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ctx.drawImage(qrImg, qrX, qrY, qrSize, qrSize);
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} else {
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ctx.fillStyle = cardBg;
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ctx.fillRect(qrX, qrY, qrSize, qrSize);
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ctx.fillStyle = cyan;
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ctx.font = "13px sans-serif";
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ctx.fillText(shareUrl, w / 2, qrY + qrSize / 2 + 5);
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}
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y += qrSize + 24;
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ctx.font = "bold 18px sans-serif";
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ctx.fillStyle = cyan;
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ctx.fillText("扫码访问课程", w / 2, y);
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y += 24;
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ctx.font = "14px sans-serif";
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ctx.fillStyle = muted;
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ctx.fillText("长按识别二维码", w / 2, y);
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y += 28;
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ctx.font = "12px sans-serif";
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ctx.fillStyle = "rgba(248,250,252,0.5)";
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ctx.fillText("自由工作 · 自在生活", w / 2, y);
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setReady(true);
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};
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useEffect(() => {
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if (open && canvasRef.current) {
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setReady(false);
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drawPoster();
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}
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}, [open, url]);
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useEffect(() => {
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const onKeyDown = (e: KeyboardEvent) => {
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if (e.key === "Escape") setOpen(false);
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};
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if (open) {
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window.addEventListener("keydown", onKeyDown);
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document.body.style.overflow = "hidden";
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}
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return () => {
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window.removeEventListener("keydown", onKeyDown);
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document.body.style.overflow = "";
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};
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}, [open]);
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const handleDownload = () => {
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const canvas = canvasRef.current;
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if (!canvas || !ready) return;
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const link = document.createElement("a");
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link.download = `分享-${title}.png`;
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link.href = canvas.toDataURL("image/png");
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link.click();
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};
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return (
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<>
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<button
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type="button"
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onClick={() => setOpen(true)}
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className={`inline-flex items-center gap-2 rounded-lg border border-[var(--border)] px-4 py-2 text-sm transition hover:bg-[var(--muted)] ${className}`}
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>
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分享
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<svg className="h-4 w-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
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<path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8.684 13.342C8.886 12.938 9 12.482 9 12c0-.482-.114-.938-.316-1.342m0 2.684a3 3 0 110-2.684m0 2.684l6.632 3.316m-6.632-6l6.632-3.316m0 0a3 3 0 105.367-2.684 3 3 0 00-5.367 2.684zm0 9.316a3 3 0 105.368 2.684 3 3 0 00-5.368-2.684z" />
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</svg>
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</button>
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{open && (
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<div
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className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 p-4"
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onClick={() => setOpen(false)}
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>
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<div
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className="relative max-h-[90vh] overflow-auto rounded-2xl bg-[var(--background)] p-4 shadow-xl"
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onClick={(e) => e.stopPropagation()}
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>
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<button
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type="button"
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onClick={() => setOpen(false)}
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className="absolute right-2 top-2 rounded-full p-2 text-[var(--muted-foreground)] hover:bg-[var(--muted)] hover:text-[var(--foreground)]"
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aria-label="关闭"
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>
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<svg className="h-5 w-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
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<path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
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</svg>
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</button>
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<h3 className="mb-4 text-center font-semibold">分享海报</h3>
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<div className="flex justify-center rounded-xl bg-[var(--muted)]/30 p-2">
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<canvas
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ref={canvasRef}
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width={POSTER_WIDTH}
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height={POSTER_HEIGHT}
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className="max-w-full rounded-lg"
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style={{ width: POSTER_WIDTH, height: POSTER_HEIGHT, maxWidth: "100%" }}
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/>
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</div>
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<p className="mt-3 text-center text-sm text-[var(--muted-foreground)]">
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下载海报后，可通过微信、朋友圈等渠道分享
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</p>
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<div className="mt-4 flex justify-center gap-3">
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<button
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type="button"
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onClick={() => setOpen(false)}
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className="rounded-lg border border-[var(--border)] px-6 py-2 text-sm transition hover:bg-[var(--muted)]"
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>
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取消
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</button>
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<button
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type="button"
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onClick={handleDownload}
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disabled={!ready}
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className="rounded-lg bg-[var(--accent)] px-6 py-2 text-sm font-medium text-[var(--accent-foreground)] transition hover:opacity-90 disabled:opacity-50"
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>
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{ready ? "下载海报" : "生成中..."}
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</button>
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</div>
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</div>
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</div>
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)}
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</>
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);
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}
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