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feat: add includeTransforms option to measure post-transform rect #109

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227 changes: 227 additions & 0 deletions examples/transform-aware.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Transform-Aware Demo - react-use-measure</title>
<style>
body {
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
margin: 0;
padding: 20px;
background: #f5f5f5;
}

.container {
max-width: 800px;
margin: 0 auto;
}

h1 {
text-align: center;
color: #333;
margin-bottom: 40px;
}

.demo-section {
background: white;
padding: 30px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0,0,0,0.1);
margin-bottom: 30px;
}

.demo-box {
width: 40px;
height: 40px;
margin: 20px 0;
border: 2px solid #333;
display: inline-block;
transition: transform 0.3s ease;
}

.demo-box.default {
background: #9cf;
transform: scale(0.75);
transform-origin: 0 0;
}

.demo-box.transform-aware {
background: #fc9;
transform: scale(0.75);
transform-origin: 0 0;
}

.bounds-display {
background: #f8f9fa;
border: 1px solid #e9ecef;
border-radius: 4px;
padding: 15px;
margin-top: 15px;
font-family: 'Monaco', 'Menlo', monospace;
font-size: 14px;
}

.bounds-display h4 {
margin: 0 0 10px 0;
color: #495057;
}

.bounds-display pre {
margin: 0;
color: #6f42c1;
}

.controls {
margin: 20px 0;
}

button {
background: #007bff;
color: white;
border: none;
padding: 10px 20px;
border-radius: 4px;
cursor: pointer;
margin-right: 10px;
}

button:hover {
background: #0056b3;
}

.explanation {
background: #e7f3ff;
border-left: 4px solid #007bff;
padding: 15px;
margin: 20px 0;
}

.explanation h4 {
margin: 0 0 10px 0;
color: #0056b3;
}
</style>
</head>
<body>
<div class="container">
<h1>Transform-Aware Measuring Demo</h1>

<div class="explanation">
<h4>What this demonstrates:</h4>
<p>Both boxes below are 40×40 pixels with <code>transform: scale(0.75)</code>.
The left box uses default measurement (layout box), the right uses transform-aware measurement (visual box).
Notice how they report different dimensions!</p>
</div>

<div class="demo-section">
<h3>Default Mode (layout-based)</h3>
<div class="demo-box default" id="default-box"></div>
<div class="bounds-display">
<h4>Reported Bounds:</h4>
<pre id="default-bounds">Loading...</pre>
</div>
</div>

<div class="demo-section">
<h3>Transform-Aware Mode (visual-based)</h3>
<div class="demo-box transform-aware" id="transform-box"></div>
<div class="bounds-display">
<h4>Reported Bounds:</h4>
<pre id="transform-bounds">Loading...</pre>
</div>
</div>

<div class="demo-section">
<div class="controls">
<button onclick="animateBoxes()">Animate Transform</button>
<button onclick="resetBoxes()">Reset</button>
</div>
<p><em>Click "Animate Transform" to see how transform-aware mode tracks the visual changes in real-time.</em></p>
</div>
</div>

<script type="module">
// Simulate the react-use-measure behavior for demo purposes
function measureElement(element, includeTransforms = false) {
if (includeTransforms) {
// Use getBoundingClientRect for transform-aware measurement
return element.getBoundingClientRect();
} else {
// Simulate layout-based measurement (what ResizeObserver would see)
const rect = element.getBoundingClientRect();
// For demo: simulate that layout box ignores transforms
return {
x: rect.x,
y: rect.y,
width: 40, // Original width
height: 40, // Original height
top: rect.top,
left: rect.left,
right: rect.left + 40,
bottom: rect.top + 40
};
}
}

function updateBounds() {
const defaultBox = document.getElementById('default-box');
const transformBox = document.getElementById('transform-box');
const defaultBounds = document.getElementById('default-bounds');
const transformBounds = document.getElementById('transform-bounds');

const defaultRect = measureElement(defaultBox, false);
const transformRect = measureElement(transformBox, true);

defaultBounds.textContent = JSON.stringify({
width: Math.round(defaultRect.width),
height: Math.round(defaultRect.height),
x: Math.round(defaultRect.x),
y: Math.round(defaultRect.y)
}, null, 2);

transformBounds.textContent = JSON.stringify({
width: Math.round(transformRect.width),
height: Math.round(transformRect.height),
x: Math.round(transformRect.x),
y: Math.round(transformRect.y)
}, null, 2);
}

// Update bounds initially and on window events
updateBounds();
window.addEventListener('resize', updateBounds);
window.addEventListener('scroll', updateBounds);

// Make functions available globally for buttons
window.animateBoxes = function() {
const boxes = document.querySelectorAll('.demo-box');
boxes.forEach(box => {
box.style.transform = 'scale(1.2) rotate(10deg)';
box.style.transition = 'transform 0.5s ease';
});

setTimeout(() => {
boxes.forEach(box => {
box.style.transform = 'scale(0.75)';
});
setTimeout(updateBounds, 100);
}, 500);

updateBounds();
};

window.resetBoxes = function() {
const boxes = document.querySelectorAll('.demo-box');
boxes.forEach(box => {
box.style.transform = 'scale(0.75)';
box.style.transition = 'transform 0.3s ease';
});
updateBounds();
};

// Update bounds periodically to show real-time changes
setInterval(updateBounds, 100);
</script>
</body>
</html>
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