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added server-side canvas support & Created Masonry Demo #32

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added server-side canvas support & Created Masonry Demo #32

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a410720
added server-side canvas support
Unmesh100 Mar 30, 2026
4eb98b9
Built a working masonry demo that positions cards in columns using Pr…
Unmesh100 Mar 30, 2026
22da079
Merge branch 'chenglou:main' into main
Unmesh100 Mar 30, 2026
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2 changes: 1 addition & 1 deletion pages/demos/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -134,7 +134,7 @@ <h2>Rich Text</h2>

<a class="card" href="/demos/masonry">
<h2>Masonry</h2>
<p>A text-card occlusion demo where height prediction comes from Pretext instead of DOM reads.</p>
<p>A text-card layout where height prediction comes from Pretext instead of DOM reads.</p>
</a>
</section>
</main>
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199 changes: 199 additions & 0 deletions pages/demos/masonry.html
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@@ -0,0 +1,199 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Masonry — Pretext</title>
<style>
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}

:root {
--bg: #121212;
--surface: #1e1e1e;
--text: #e8e6e3;
--muted: #7a7875;
--accent: #d4a373;
--border: #333;
--color-1: #264653;
--color-2: #2a9d8f;
--color-3: #e9c46a;
--color-4: #f4a261;
--color-5: #e76f51;
--color-6: #6d597a;
--color-7: #b56576;
--color-8: #c9ada7;
}

body {
background: var(--bg);
color: var(--text);
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
min-height: 100vh;
overflow-x: hidden;
}

.controls {
position: fixed;
bottom: 24px;
left: 50%;
transform: translateX(-50%);
display: flex;
align-items: center;
gap: 12px;
padding: 14px 20px;
background: var(--surface);
border: 1px solid var(--border);
border-radius: 40px;
box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
z-index: 100;
}

.controls label {
font-size: 13px;
color: var(--muted);
letter-spacing: 0.02em;
}

.controls input[type="range"] {
width: 100px;
height: 4px;
-webkit-appearance: none;
appearance: none;
background: var(--border);
border-radius: 2px;
cursor: pointer;
}

.controls input[type="range"]::-webkit-slider-thumb {
-webkit-appearance: none;
width: 14px;
height: 14px;
background: var(--accent);
border-radius: 50%;
cursor: grab;
}

.controls input[type="range"]::-moz-range-thumb {
width: 14px;
height: 14px;
background: var(--accent);
border: none;
border-radius: 50%;
cursor: grab;
}

.controls span {
font-size: 14px;
font-weight: 600;
color: var(--text);
min-width: 20px;
text-align: center;
}

.page {
padding: 48px 24px 120px;
max-width: 100vw;
}

.eyebrow {
font: 11px/1.3 "SF Mono", ui-monospace, monospace;
letter-spacing: 0.12em;
text-transform: uppercase;
color: var(--accent);
margin-bottom: 8px;
}

h1 {
font: 300 28px/1.15 Georgia, "Times New Roman", serif;
margin-bottom: 12px;
}

.intro {
font-size: 15px;
line-height: 1.6;
color: var(--muted);
max-width: 520px;
margin-bottom: 48px;
}

.grid {
position: relative;
min-height: 600px;
}

.masonry-card {
position: absolute;
width: var(--card-width);
left: var(--card-left);
top: var(--card-top);
background: var(--surface);
border-radius: 12px;
overflow: hidden;
box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
transition: transform 200ms ease, box-shadow 200ms ease;
}

.masonry-card:hover {
transform: translateY(-2px);
box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.card-image {
width: 100%;
padding-bottom: 45%;
}

.card-label {
display: block;
padding: 16px 20px 8px;
font: 11px/1.2 "SF Mono", ui-monospace, monospace;
letter-spacing: 0.08em;
text-transform: uppercase;
color: var(--accent);
}

.card-text {
padding: 0 20px 20px;
font-size: 14px;
line-height: 1.55;
color: var(--text);
}

@media (max-width: 640px) {
.page {
padding: 32px 16px 120px;
}

.controls {
bottom: 16px;
padding: 12px 16px;
}
}
</style>
</head>
<body>
<main class="page">
<p class="eyebrow">Pretext Demo</p>
<h1>Masonry</h1>
<p class="intro">
A Pinterest-style layout with cards positioned in columns based on
predicted heights — computed without any DOM reads in the layout path.
Adjust the column count to see how Pretext handles the reflow.
</p>

<div class="grid" id="grid"></div>
</main>

<div class="controls">
<label for="column-slider">Columns</label>
<input type="range" id="column-slider" min="2" max="4" value="2" step="1">
<span id="column-value">2</span>
</div>

<script type="module" src="/pages/demos/masonry.ts"></script>
</body>
</html>
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