add official Chrome feature demos
This commit is contained in:
@@ -0,0 +1,69 @@
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const canvas = document.getElementById('canvas');
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const ctx = canvas.getContext('2d');
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const drawElement = document.getElementById('draw-element');
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const statusPanel = document.getElementById('support-status');
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const demoForm = document.getElementById('demo-form');
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const hasHtmlInCanvas =
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typeof ctx.drawElementImage === 'function' &&
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typeof canvas.requestPaint === 'function';
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function setStatus(state, message) {
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statusPanel.dataset.state = state;
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statusPanel.textContent = message;
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}
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function resizeCanvas(entry) {
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const dpcSize = entry.devicePixelContentBoxSize?.[0];
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const nextWidth = dpcSize?.inlineSize ?? Math.round(entry.contentRect.width * window.devicePixelRatio);
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const nextHeight = dpcSize?.blockSize ?? Math.round(entry.contentRect.height * window.devicePixelRatio);
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if (canvas.width !== nextWidth) {
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canvas.width = nextWidth;
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}
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if (canvas.height !== nextHeight) {
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canvas.height = nextHeight;
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}
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}
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function paint() {
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ctx.reset();
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ctx.fillStyle = '#101820';
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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const x = canvas.width / 25;
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const y = canvas.height / 25;
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const transform = ctx.drawElementImage(drawElement, x, y);
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drawElement.style.transform = transform.toString();
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}
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demoForm.addEventListener('submit', (event) => {
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event.preventDefault();
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setStatus('ok', '表单提交事件来自真实 DOM：发射指令已拦截，demo 仍停留在当前页面。');
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});
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if (!hasHtmlInCanvas) {
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document.body.dataset.api = 'fallback';
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setStatus(
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'fail',
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'当前浏览器未暴露 drawElementImage/requestPaint。请使用 Chrome Canary 149+ 并开启 canvas-draw-element flag。'
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);
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} else {
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document.body.dataset.api = 'native';
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setStatus('ok', '已检测到 HTML-in-Canvas 实验 API，可以操作 canvas 中绘制的 DOM 表单。');
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canvas.onpaint = paint;
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const supportsDevicePixelContentBox =
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typeof ResizeObserverEntry !== 'undefined' &&
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'devicePixelContentBoxSize' in ResizeObserverEntry.prototype;
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const resizeOptions = supportsDevicePixelContentBox ? { box: 'device-pixel-content-box' } : {};
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const observer = new ResizeObserver(([entry]) => {
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resizeCanvas(entry);
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canvas.requestPaint();
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});
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observer.observe(canvas, resizeOptions);
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canvas.requestPaint();
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}
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@@ -0,0 +1,115 @@
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<!doctype html>
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<html lang="zh-CN">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>HTML-in-Canvas API Demo</title>
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<link rel="stylesheet" href="./styles.css" />
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</head>
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<body>
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<main class="page-shell">
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<section class="intro" aria-labelledby="page-title">
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<p class="eyebrow">Chrome Origin Trial Demo</p>
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<h1 id="page-title">HTML-in-Canvas API</h1>
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<p class="lede">
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这个页面基于 WICG 官方示例改写，演示把真实 DOM 表单绘制进
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<code><canvas></code>，同时保留输入、选择、滑块和按钮的交互能力。
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</p>
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<div class="status-panel" id="support-status" role="status">
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正在检测当前浏览器是否支持实验 API...
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</div>
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</section>
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<section class="demo-grid" aria-label="HTML-in-Canvas 演示">
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<div class="canvas-stage">
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<canvas id="canvas" width="638" height="318" layoutsubtree="true">
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<div id="draw-element" class="control-panel">
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<form id="demo-form" action="#" method="get">
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<fieldset>
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<legend>飞船控制台</legend>
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<label class="field-row" for="ship-name">
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<span>飞船名称</span>
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<input type="text" id="ship-name" value="Canvas 远航者" />
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</label>
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<label class="check-row" for="hyperdrive">
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<input type="checkbox" id="hyperdrive" checked />
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<span>启动超空间引擎</span>
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</label>
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<fieldset class="nested-fieldset">
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<legend>目标星系</legend>
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<label class="check-row" for="alpha">
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<input type="radio" id="alpha" name="system" value="alpha" checked />
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<span>半人马座 Alpha</span>
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</label>
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<label class="check-row" for="beta">
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<input type="radio" id="beta" name="system" value="beta" />
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<span>参宿四 Betelgeuse</span>
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</label>
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</fieldset>
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<label class="field-row" for="shield-level">
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<span>护盾强度</span>
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<input type="range" id="shield-level" min="0" max="100" value="75" />
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</label>
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<button type="submit">发射</button>
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</fieldset>
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</form>
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</div>
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</canvas>
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<div class="fallback-preview" aria-hidden="true">
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<p class="fallback-label">当前浏览器未启用实验 API，下面显示同一 DOM 表单的静态预览。</p>
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<div class="control-panel preview-panel">
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<fieldset>
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<legend>飞船控制台</legend>
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<label class="field-row">
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<span>飞船名称</span>
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<input type="text" value="Canvas 远航者" disabled />
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</label>
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<label class="check-row">
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<input type="checkbox" checked disabled />
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<span>启动超空间引擎</span>
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</label>
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<fieldset class="nested-fieldset">
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<legend>目标星系</legend>
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<label class="check-row">
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<input type="radio" name="preview-system" checked disabled />
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<span>半人马座 Alpha</span>
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</label>
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<label class="check-row">
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<input type="radio" name="preview-system" disabled />
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<span>参宿四 Betelgeuse</span>
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</label>
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</fieldset>
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<label class="field-row">
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<span>护盾强度</span>
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<input type="range" min="0" max="100" value="75" disabled />
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</label>
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<button type="button" disabled>发射</button>
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</fieldset>
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</div>
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</div>
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</div>
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<aside class="notes" aria-label="运行说明">
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<h2>运行条件</h2>
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<p>
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Chrome 官方文章说明：该 API 在 Chrome 148-150 处于源试用阶段，本地测试需要
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Chrome Canary 149+，并开启 <code>chrome://flags/#canvas-draw-element</code>。
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</p>
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<h2>可验证点</h2>
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<ul>
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<li>表单控件来自真实 DOM，不是 canvas 手绘控件。</li>
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<li>输入框、复选框、单选项、滑块和按钮可直接操作。</li>
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<li>JS 每次 paint 后同步 DOM transform，让命中区域与 canvas 绘制位置对齐。</li>
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</ul>
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</aside>
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</section>
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</main>
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<script src="./app.js" type="module"></script>
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</body>
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</html>
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@@ -0,0 +1,292 @@
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:root {
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color-scheme: light;
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--ink: #17202a;
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--muted: #5d6670;
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--panel: #f7f4ec;
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--canvas: #101820;
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--accent: #ffb000;
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--accent-strong: #e04f2f;
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--line: #263241;
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--ok: #1d7f4f;
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--warn: #9a5b00;
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font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
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}
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* {
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box-sizing: border-box;
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}
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body {
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margin: 0;
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min-height: 100vh;
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color: var(--ink);
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background:
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linear-gradient(90deg, rgba(23, 32, 42, 0.06) 1px, transparent 1px),
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linear-gradient(rgba(23, 32, 42, 0.05) 1px, transparent 1px),
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#fffaf0;
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background-size: 28px 28px;
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}
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button,
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input {
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font: inherit;
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}
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code {
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border: 1px solid rgba(23, 32, 42, 0.16);
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border-radius: 4px;
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padding: 0.08rem 0.28rem;
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background: rgba(255, 255, 255, 0.74);
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}
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.page-shell {
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width: min(1120px, calc(100vw - 32px));
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margin: 0 auto;
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padding: 44px 0 56px;
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}
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.intro {
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display: grid;
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gap: 12px;
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margin-bottom: 28px;
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}
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.eyebrow {
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margin: 0;
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color: var(--accent-strong);
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font-size: 0.82rem;
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font-weight: 800;
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letter-spacing: 0.08em;
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text-transform: uppercase;
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}
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h1,
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h2,
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p {
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margin: 0;
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}
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h1 {
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max-width: 760px;
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font-family: Georgia, "Times New Roman", serif;
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font-size: clamp(3rem, 6vw, 5.8rem);
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line-height: 0.92;
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letter-spacing: 0;
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}
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.lede {
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max-width: 760px;
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color: var(--muted);
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font-size: 1.06rem;
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line-height: 1.75;
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}
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.status-panel {
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width: fit-content;
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max-width: 100%;
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border: 1px solid rgba(23, 32, 42, 0.18);
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border-left: 6px solid var(--warn);
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border-radius: 6px;
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padding: 10px 14px;
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color: var(--warn);
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background: rgba(255, 255, 255, 0.72);
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font-weight: 700;
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}
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.status-panel[data-state="ok"] {
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border-left-color: var(--ok);
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color: var(--ok);
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}
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.status-panel[data-state="fail"] {
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border-left-color: var(--accent-strong);
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color: var(--accent-strong);
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}
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.demo-grid {
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display: grid;
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grid-template-columns: minmax(0, 1.55fr) minmax(280px, 0.8fr);
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gap: 24px;
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align-items: stretch;
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}
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.canvas-stage {
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position: relative;
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display: grid;
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place-items: center;
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min-height: 480px;
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border: 1px solid rgba(23, 32, 42, 0.24);
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border-radius: 8px;
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padding: 22px;
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background:
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radial-gradient(circle at 24% 18%, rgba(255, 176, 0, 0.34), transparent 28%),
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linear-gradient(135deg, #1a2633 0%, #0d141b 100%);
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box-shadow: 0 24px 70px rgba(23, 32, 42, 0.18);
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}
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canvas {
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width: min(638px, 100%);
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height: auto;
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aspect-ratio: 638 / 318;
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border: 2px solid rgba(255, 176, 0, 0.9);
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border-radius: 6px;
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background: var(--canvas);
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box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.16);
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}
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.fallback-preview {
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display: none;
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position: absolute;
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inset: 42px;
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place-items: center;
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gap: 14px;
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border: 1px dashed rgba(255, 176, 0, 0.72);
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border-radius: 6px;
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padding: 22px;
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background: rgba(16, 24, 32, 0.9);
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}
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body[data-api="fallback"] .fallback-preview {
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display: grid;
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}
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body[data-api="fallback"] canvas {
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opacity: 0.34;
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}
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.fallback-label {
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color: #ffd27c;
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font-size: 0.86rem;
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font-weight: 800;
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text-align: center;
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}
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.control-panel {
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width: 578px;
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color: #101820;
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}
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.control-panel fieldset {
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display: grid;
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gap: 12px;
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margin: 0;
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border: 2px solid #17202a;
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border-radius: 6px;
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padding: 18px;
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background: #fffaf0;
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}
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.control-panel legend {
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padding: 0 8px;
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font-weight: 900;
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}
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.field-row,
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.check-row {
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display: flex;
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gap: 10px;
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align-items: center;
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}
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.field-row {
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justify-content: space-between;
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}
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.field-row input[type="text"] {
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width: min(310px, 58%);
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border: 1px solid #17202a;
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border-radius: 4px;
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padding: 7px 9px;
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background: #ffffff;
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}
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.field-row input[type="range"] {
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width: min(300px, 58%);
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accent-color: var(--accent-strong);
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}
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.nested-fieldset {
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grid-template-columns: repeat(2, minmax(0, 1fr));
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}
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.nested-fieldset legend {
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grid-column: 1 / -1;
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}
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.control-panel button {
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justify-self: end;
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border: 2px solid #17202a;
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border-radius: 4px;
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padding: 8px 18px;
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color: #17202a;
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background: var(--accent);
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font-weight: 900;
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cursor: pointer;
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}
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.preview-panel {
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width: min(578px, 100%);
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}
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.preview-panel input:disabled,
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.preview-panel button:disabled {
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cursor: not-allowed;
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opacity: 0.72;
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}
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.notes {
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display: grid;
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align-content: start;
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gap: 14px;
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border-left: 4px solid var(--line);
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padding: 20px 0 20px 22px;
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color: var(--muted);
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line-height: 1.7;
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}
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.notes h2 {
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color: var(--ink);
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font-size: 1rem;
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}
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.notes ul {
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display: grid;
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gap: 8px;
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margin: 0;
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padding-left: 1.2rem;
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}
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@media (max-width: 820px) {
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.page-shell {
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width: min(100vw - 22px, 680px);
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padding-top: 28px;
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}
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h1 {
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font-size: 3.1rem;
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}
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.demo-grid {
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grid-template-columns: 1fr;
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}
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.canvas-stage {
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min-height: 360px;
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padding: 14px;
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}
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.fallback-preview {
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inset: 24px;
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padding: 14px;
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}
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.nested-fieldset {
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grid-template-columns: 1fr;
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}
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.notes {
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border-left: 0;
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border-top: 4px solid var(--line);
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padding: 18px 0 0;
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}
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}
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Reference in New Issue
Block a user