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Houdini Breakout Session
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Surma
November 12, 2016
Technology
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Houdini Breakout Session
Chrome Dev Summit 2016
Surma
November 12, 2016
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Transcript
Houdini
Houdini
Typed Object Model
Typed Object Model $('#element').styleMap .set('opacity', new CSSNumberValue(0.5)); $('#element').styleMap .set('height', new
CSSSimpleLength(50, 'px'));
Typed Object Model $('#element').styleMap .set('height', new CSSSimpleLength(50, 'px')); $('#element').styleMap .get('height').value;
// 50 $('#element').styleMap .get('height').type; // ‘px’
Typed Object Model $('#element').styleMap .set('height', new CSSCalcLength('50vh - 20px')); $('#element').styleMap.get('height').vh;
// 50 $('#element').styleMap.get('height').px; // -20
Typed Object Model $('#element').styleMap .set("height", new CSSCalcLength({ vh: 50, px:
-20, }));
Typed Object Model const h = new CSSSimpleLength(50, 'vh') .subtract(new
CSSSimpleLength(20, ‘px')); $('#element').styleMap.set('height', h);
Typed Object Model const h = new CSSSimpleLength(50, 'vh') .subtract(new
CSSSimpleLength(20, ‘px')); $('#element').styleMap.set('height', h); // h == calc(50vh - 20px);
None
Houdini
Houdini X AnimationWorklet
Animation Worklet
None
None
bit.ly/best-effort-scroll position: static;
bit.ly/best-effort-scroll position: static; position: fixed; + JS transform
Animation Worklet <style> :root { animator-root: parallax; } .bg {
animator: parallax; } </style> <div class='bg' style='--parallax-rate: 0.2'></div> <div class='bg' style='--parallax-rate: 0.5'></div> Experimental
Animation Worklet registerAnimator('parallax', class ParallaxAnimator { static inputProperties = ['transform',
'--parallax-rate']; static outputProperties = ['transform']; static rootInputScroll = true; animate(root, children) { const scrollTop = root.scrollOffsets.top; children.forEach(background => parallaxMath(elem, background.styleMap.get('--parallax-rate'))); } }); Experimental
None
Houdini
Paint Worklet
Paint Worklet <div id="myElement"></div> <style> #myElement { --image: url('#someUrlWhichIsLoading'); background-image:
paint(image-with-placeholder); } </style> Experimental
Paint Worklet <script> document.registerProperty({ name: '--image', syntax: '<image>' }); window.paintWorklet.import('paintworklet.js');
</script> Experimental
Paint Worklet registerPaint('image-with-placeholder', class { static get inputProperties() { return
['--image']; } paint(ctx, geom, properties) { // ... } }); Experimental
Paint Worklet paint(ctx, geom, properties) { const img = properties.get('--image');
switch (img.state) { case 'ready': ctx.drawImage(img, 0, 0, geom.width, geom.height); break; case 'pending': drawMountains(ctx); break; case 'invalid': default: drawSadFace(ctx); } } Experimental
None
bit.ly/houdini-updates
None