![]() ![]() With animated elements on separate layers, it’s just moving layers around or changing their opacity and that is exactly where the GPU shines. Otherwise, for every animation frame, the browser would have to recalculate the element’s geometry (do layout), render the image of the page’s new state (do repaint) and then send it again to the GPU to display on screen. To animate an element in a separate layer with compositing, the browser has to be sure that the animated CSS property: It’s designed for performing the complex mathematical calculations that are necessary for graphics rendering so it’s able to compose images very quickly, which takes the load off the CPU. It is a standalone unit with its own processors and its own memory. GPU is a like a separate computer inside your device. The reason why compositing is a fast operation is that it happens on the GPU. This way the browser avoids repaints and does only compositing. When you have an animated element on its own layer, moving it around doesn’t affect the positions of surrounding elements, the only thing that moves is that layer. coordinates ( top, right, bottom, left)īrowsers make optimizations by creating separate layers for elements with CSS transitions or animations on those four properties.Some of the CSS properties that affect the layout are: It does that by looking at the viewport size and the computed styles. In the layout phase, the browser calculates how much space each box is going to take and where to place it. The layout tree also includes pseudo elements that are added to CSS (these are not present in the DOM). Large paragraphs of text-a single DOM element-are represented as multiple boxes in the layout tree. Layout tree elements don’t map directly to the visible DOM elements. Examples of things that the layout tree doesn’t include are: The DOM contains all of the HTML nodes, but only the visible elements become part of the layout tree. The layout tree is based on the DOM, but it’s usually shaped a bit different. Elements in the layout tree are represented as vector boxes. In order to that, it makes another tree - the layout tree. ![]() When you hover it, the individual cards "glow" and this effect is made possible by this pattern.Once the browser knows which styles apply to each element, comes the layout phase where the browser figures out the dimensions and positions of all the elements it needs to display on the page. The children themselves only define the behavior they intent to have for those variants.Ī great example where I used propagation on this blog is the "Featured" section on the home page of this blog. Only the parent motion component, in this case, defines the animate prop. Remember in my previous blog post when we learned that every Framer Motion Animation needed 3 properties (props) initial, animate, transition, to define a transition/animation? Well, for this pattern that's not entirely true.įramer Motion allows variants to "flow down" through every motion child component as long as these motion components do not have an animate prop defined. However, this got me confused at the beginning because it broke some of the mental models I originally had when it comes to defining animations. I quickly learned that it's possible to propagate changes of variants from a parent motion component to any child motion component. One of the first advanced patterns I got to encounter when I tried to add some micro-interactions with Framer Motion on my projects is propagation. Your feedback is super important and will help me do better for my future blog posts □! Propagation Let me know what you think about these examples, and whether they were helpful. Like the original blog post, this article contains a series of interactive widgets and playgrounds with preset examples to allow you to apply the Framer Motion concepts we're about to see without the need to set up anything! ![]()
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