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Diffstat (limited to 'app/javascript/mastodon/components/animated_number.js')
-rw-r--r-- | app/javascript/mastodon/components/animated_number.js | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/app/javascript/mastodon/components/animated_number.js b/app/javascript/mastodon/components/animated_number.js new file mode 100644 index 000000000..2d359fbc6 --- /dev/null +++ b/app/javascript/mastodon/components/animated_number.js @@ -0,0 +1,47 @@ +import React from 'react'; +import PropTypes from 'prop-types'; +import { FormattedNumber } from 'react-intl'; +import TransitionMotion from 'react-motion/lib/TransitionMotion'; +import spring from 'react-motion/lib/spring'; +import { reduceMotion } from 'mastodon/initial_state'; + +export default class AnimatedNumber extends React.PureComponent { + + static propTypes = { + value: PropTypes.number.isRequired, + }; + + willEnter () { + return { y: -1 }; + } + + willLeave () { + return { y: spring(1, { damping: 35, stiffness: 400 }) }; + } + + render () { + const { value } = this.props; + + if (reduceMotion) { + return <FormattedNumber value={value} />; + } + + const styles = [{ + key: value, + style: { y: spring(0, { damping: 35, stiffness: 400 }) }, + }]; + + return ( + <TransitionMotion styles={styles} willEnter={this.willEnter} willLeave={this.willLeave}> + {items => ( + <span className='animated-number'> + {items.map(({ key, style }) => ( + <span key={key} style={{ position: style.y > 0 ? 'absolute' : 'static', transform: `translateY(${style.y * 100}%)` }}><FormattedNumber value={key} /></span> + ))} + </span> + )} + </TransitionMotion> + ); + } + +} |