108 lines
2.3 KiB
Markdown
108 lines
2.3 KiB
Markdown
<br /><br />
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# React Native: Animated
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ReactEurope 2015, Paris - Spencer Ahrens - Facebook
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## Fluid Interactions
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- People expect smooth, delightful experiences
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- Complex interactions are hard
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- Common patterns can be optimized
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<br /><br />
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## Declarative Interactions
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- Wire up inputs (events) to outputs (props) + transforms (springs, easing, etc.)
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- Arbitrary code can define/update this config
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- Config can be serialized -> native/main thread
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- No refs or lifecycle to worry about
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<br /><br />
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## var { Animated } = require('react-native');
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- New library soon to be released for React Native
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- 100% JS implementation -> X-Platform
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- Per-platform native optimizations planned
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- This talk -> usage examples, not implementation
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<br /><br />
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## Gratuitous Animation Demo App
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- Layout uses `flexWrap: 'wrap'`
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- longPress -> drag to reorder
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- Tap to open example sets
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<br /><br />
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## Gratuitous Animation Codez
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- Step 1: 2D tracking pan gesture
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- Step 2: Simple pop-out spring on select
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- Step 3: Animate grid reordering with `LayoutAnimation`
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- Step 4: Opening animation
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<br /><br />
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## Animation Example Set
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- `Animated.Value` `this.props.open` passed in from parent
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- `interpolate` works with string "shapes," e.g. `'rgb(0, 0, 255)'`, `'45deg'`
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- Examples easily composed as separate components
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- Dismissing tracks interpolated gesture
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- Custom release logic
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<br /><br />
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## Tilting Photo
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- Pan -> translateX * 2, rotate, opacity (via tracking)
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- Gesture release triggers separate animations
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- `addListener` for async, arbitrary logic on animation progress
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- `interpolate` easily creates parallax and other effects
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<br /><br />
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## Bobbles
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- Static positions defined
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- Listens to events to maybe change selection
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- Springs previous selection back
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- New selection tracks selector
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- `getTranslateTransform` adds convenience
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<br /><br />
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## Chained
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- Classic "Chat Heads" animation
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- Each sticker tracks the one before it with a soft spring
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- `decay` maintains gesture velocity, followed by `spring` to home
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- `stopAnimation` provides the last value for `setOffset`
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<br /><br />
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## Scrolling
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- `Animated.event` can track all sorts of stuff
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- Multi-part ranges and extrapolation options
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- Transforms decompose into ordered components
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<br /><br />
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# React Native: Animated
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- Landing soon in master (days)
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- GitHub: @vjeux, @sahrens
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- Questions?
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