Package - @douyinfe/semi-animation

Provides basic JS animation engine：

Simulate animation changes based on interpolation,the performance is more natural
Support the definition of various easing functions
Provides a complete life cycle hook and operation method, allowing developers to freely control the animation

Install

npm install @douyinfe/semi-animation

Usage

Animation

semi-animation provides a class called Animation . It has a complete life cycle hook and control method to support operating animation like audio and video.

Use in JS

import { Animation } from '@douyinfe/semi-animation';

const div = document.createElement('span');
div.style.display = 'inline-block';
document.body.appendChild(div);

const animation = new Animation({
    from: { value: 0 },
    to: { value: 1 },
});

animation.on('frame', props => {
    const num = props.value.toFixed(2);
    div.style.transform = `scale(${num})`;
    div.innerText = num;
});

Use in React

import { Animation } from '@douyinfe/semi-animation';
import { Component } from 'react';

class App extends Component {
    constructor(props) {
        super(props);
        this.state = { value: 0 };

        this.animation = new Animation({
            from: { value: 0 },
            to: { value: 1 },
        });

        this.animation.on('frame', props => {
            this.setState({ value: props.value.toFixed(2) });
        });
    }

    componentDidMount() {
        this.animation.start();
    }

    componentWillUnmount() {
        this.animation.destroy();
    }

    render() {
        const { value } = this.state;

        return <div style={{ display: 'inline-block', transform: `scale(${value})` }}>{value}</div>;
    }
}

Use in Vue

<template>
    <div :style="{ transform: `scale(${value})`, display: 'inline-block' }">{{value}}</div>
</template>

<script>
    import { Animation } from '@douyinfe/semi-animation';

    export default {
        data() {
            return { value: 0 };
        },
        created() {
            this.animation = new Animation({
                from: { value: 0 },
                to: { value: 1 },
            });

            this.animation.on('frame', props => {
                this.value = props.value;
            });
        },
        mounted() {
            this.animation.start();
        },
        beforeDestroy() {
            this.animation.destroy();
        },
    };
</script>

Show results：

API

new Animation({ ...props }, { ...config });

props

Prop Name	Type	Required	Default	Description
from	Object	Y		Initial state
to	Object	Y		Termination state

config

Prop Name	Type	Required	Default	Description
duration	Number	N	1000	Animation duration. If this parameter is passed in, the easing function of the animation will use easing or linear function，unit: ms
easing	Function\|String	N		Easing function for animation. If duration is not passed, the spring easing function is used by default. If the duration parameter is passed in, the linear easing function will be used by default.For example, incoming `"cubic-bezier(.17,.67,.83,.67)"` will cause the animation frame update performed according to this easing function
tension	Number	N	170	Tension, used for spring easing function
friction	Number	N	14	Friction, used for spring easing function

Instance methods

Name	Params	Return	Description
start			Start the animation
pause			Pause the animation.After pausing, you must use the resume method to continue playing, not using start.
resume			Continue the animation.Only has an effect when the animation is paused.
reverse			Reverse the animation
stop			Stop the animation.Only have an effect during animation playback, pause, and after end
end			Immediately terminate the animation, and pass the final state value of the animation to the callback method
reset			Reset the animation
destroy			Destroy the animation
getInitialStates		Object	Get the initial state
getCurrentStates		Object	Get the current state
getFinalStates		Object	Get the final state
on	eventName:string, eventHandler:Function(props: object): void		Binding event callback method。The parameters received by each callback are the current animation state objects.

Supported events

start: Triggered when the animation starts
pause: Triggered when the animation pauses(The event is triggered when the animation state is changed from playing to pause, and it will not be triggered in other cases)
resume: Triggered when the animation continues to play(The event is triggered when the animation state is changed from paused to playing, and it will not be triggered in other cases)
frame: Triggered when the animation frame is updated
rest: Triggered when the animation ends(The event will be triggered when the animation ends normally)
stop: Triggered when the animation stops(This event is triggered when the instance stop method is called)

Developers can use animation.on(eventName: string, cb: Function(currentStyle: object)) to bind the above events.

import { Animation } from '@douyinfe/semi-animation';
// ...
const animation = new Animation(
    {
        from: { value1: 0, value2: 1 /* ... */ },
        to: { value1: 1, value2: 2 /* ... */ },
    },
    {
        duration: 1000, // After passing in duration, the default is linear interpolation
    }
);

animation.on('frame', currentState => {
    // currentState: is the state value object at the current moment
    // { value1: xxx, value2: xxx, ... }
});

// The callbacks such as start and pause are the same as the frame above, and the parameters are also the same.
animation.on('start', currentState => { /* ... */ });
animation.on('pause', currentState => { /* ... */ });
animation.on('resume', currentState => { /* ... */ });
animation.on('rest', currentState => { /* ... */ });
animation.on('stop', currentState => { /* ... */ });

Licence

MIT

Current Tags

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