Staggered Animations: Choreographing UI Changes
A staggered animation is a domino effect for your UI. Instead of animating everything at once, you sequence animations with slight delays for a more fluid, polished feel. Use it for list items appearing one by one. The footgun is timing: too long feels slow.
WHY IT EXISTS: To move beyond rigid, simultaneous animations. When multiple UI elements change at once, the effect can be jarring or feel mechanical. Staggering introduces a sense of order and flow, making complex transitions feel more natural, organic, and polished.
THE MENTAL MODEL: Think of a domino rally. You don't push all the dominoes at once; you tip the first one, and it triggers the next in a chain reaction. Staggered animations apply this to UI, where one animation's start is slightly delayed from the previous one, creating a flowing sequence.
HOW IT WORKS: In Flutter, this is typically achieved using a single AnimationController that drives the overall duration of the entire sequence. Then, for each individual widget you want to animate, you create a separate Animation object. The key is to map a sub-interval of the controller's total duration to each widget's animation. For example, the first item animates from 0.0 to 0.2 of the total duration, the second from 0.1 to 0.3, the third from 0.2 to 0.4, and so on. This overlap creates the staggered feel.
WHEN TO USE IT: Use staggered animations when a group of related elements appears or disappears. A classic example is a list of items loading onto the screen; animating them in one by one is more visually appealing than having them all pop in at once. Another is a navigation menu where the menu items slide or fade into view sequentially to guide the eye.
WHEN NOT TO USE IT: Avoid staggering for critical, atomic actions. For example, a confirmation dialog with "OK" and "Cancel" buttons should appear instantly and together; staggering them would be confusing and slow down the user. It's also overkill for single-element animations or when performance on low-end devices is a top priority.
ONE CANONICAL EXAMPLE: A user opens a profile page. Instead of the whole page appearing at once, the profile picture fades in first. 50 milliseconds later, the username slides in from below. 50 milliseconds after that, the user's bio fades in. The entire sequence feels like a cohesive, choreographed introduction to the content, guiding the user's eye from the most important element to the least.
Read the original → docs.flutter.dev
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