element-web/src/Velociraptor.js

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import React from "react";
import ReactDom from "react-dom";
import Velocity from "velocity-animate";
import PropTypes from 'prop-types';
/**
* The Velociraptor contains components and animates transitions with velocity.
* It will only pick up direct changes to properties ('left', currently), and so
* will not work for animating positional changes where the position is implicit
* from DOM order. This makes it a lot simpler and lighter: if you need fully
* automatic positional animation, look at react-shuffle or similar libraries.
*/
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export default class Velociraptor extends React.Component {
static propTypes = {
// either a list of child nodes, or a single child.
children: PropTypes.any,
// optional transition information for changing existing children
transition: PropTypes.object,
// a list of state objects to apply to each child node in turn
startStyles: PropTypes.array,
// a list of transition options from the corresponding startStyle
enterTransitionOpts: PropTypes.array,
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};
static defaultProps = {
startStyles: [],
enterTransitionOpts: [],
};
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constructor(props) {
super(props);
this.nodes = {};
this._updateChildren(this.props.children);
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}
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componentDidUpdate() {
this._updateChildren(this.props.children);
}
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_updateChildren(newChildren) {
const oldChildren = this.children || {};
this.children = {};
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React.Children.toArray(newChildren).forEach((c) => {
if (oldChildren[c.key]) {
const old = oldChildren[c.key];
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const oldNode = ReactDom.findDOMNode(this.nodes[old.key]);
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if (oldNode && oldNode.style.left !== c.props.style.left) {
Velocity(oldNode, { left: c.props.style.left }, this.props.transition).then(() => {
// special case visibility because it's nonsensical to animate an invisible element
// so we always hidden->visible pre-transition and visible->hidden after
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if (oldNode.style.visibility === 'visible' && c.props.style.visibility === 'hidden') {
oldNode.style.visibility = c.props.style.visibility;
}
});
//console.log("translation: "+oldNode.style.left+" -> "+c.props.style.left);
}
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if (oldNode && oldNode.style.visibility === 'hidden' && c.props.style.visibility === 'visible') {
oldNode.style.visibility = c.props.style.visibility;
}
// clone the old element with the props (and children) of the new element
// so prop updates are still received by the children.
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this.children[c.key] = React.cloneElement(old, c.props, c.props.children);
} else {
// new element. If we have a startStyle, use that as the style and go through
// the enter animations
const newProps = {};
const restingStyle = c.props.style;
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const startStyles = this.props.startStyles;
if (startStyles.length > 0) {
const startStyle = startStyles[0];
newProps.style = startStyle;
// console.log("mounted@startstyle0: "+JSON.stringify(startStyle));
}
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newProps.ref = ((n) => this._collectNode(
c.key, n, restingStyle,
));
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this.children[c.key] = React.cloneElement(c, newProps);
}
});
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}
_collectNode(k, node, restingStyle) {
if (
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node &&
this.nodes[k] === undefined &&
this.props.startStyles.length > 0
) {
const startStyles = this.props.startStyles;
const transitionOpts = this.props.enterTransitionOpts;
const domNode = ReactDom.findDOMNode(node);
// start from startStyle 1: 0 is the one we gave it
// to start with, so now we animate 1 etc.
for (var i = 1; i < startStyles.length; ++i) {
Velocity(domNode, startStyles[i], transitionOpts[i-1]);
/*
console.log("start:",
JSON.stringify(transitionOpts[i-1]),
"->",
JSON.stringify(startStyles[i]),
);
*/
}
// and then we animate to the resting state
Velocity(domNode, restingStyle,
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transitionOpts[i-1])
.then(() => {
// once we've reached the resting state, hide the element if
// appropriate
domNode.style.visibility = restingStyle.visibility;
});
// console.log("enter:",
// JSON.stringify(transitionOpts[i-1]),
// "->",
// JSON.stringify(restingStyle));
}
this.nodes[k] = node;
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}
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render() {
return (
<span>
{ Object.values(this.children) }
</span>
);
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}
}