122 lines
4.1 KiB
JavaScript
122 lines
4.1 KiB
JavaScript
import React from "react";
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import ReactDom from "react-dom";
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import PropTypes from 'prop-types';
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/**
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* The NodeAnimator contains components and animates transitions.
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* It will only pick up direct changes to properties ('left', currently), and so
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* will not work for animating positional changes where the position is implicit
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* from DOM order. This makes it a lot simpler and lighter: if you need fully
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* automatic positional animation, look at react-shuffle or similar libraries.
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*/
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export default class NodeAnimator extends React.Component {
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static propTypes = {
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// either a list of child nodes, or a single child.
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children: PropTypes.any,
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// optional transition information for changing existing children
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transition: PropTypes.object,
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// a list of state objects to apply to each child node in turn
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startStyles: PropTypes.array,
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};
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static defaultProps = {
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startStyles: [],
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};
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constructor(props) {
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super(props);
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this.nodes = {};
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this._updateChildren(this.props.children);
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}
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componentDidUpdate() {
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this._updateChildren(this.props.children);
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}
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/**
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*
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* @param {HTMLElement} node element to apply styles to
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* @param {object} styles a key/value pair of CSS properties
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* @returns {void}
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*/
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_applyStyles(node, styles) {
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Object.entries(styles).forEach(([property, value]) => {
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node.style[property] = value;
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});
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}
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_updateChildren(newChildren) {
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const oldChildren = this.children || {};
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this.children = {};
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React.Children.toArray(newChildren).forEach((c) => {
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if (oldChildren[c.key]) {
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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) {
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this._applyStyles(oldNode, { left: c.props.style.left });
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// console.log("translation: "+oldNode.style.left+" -> "+c.props.style.left);
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}
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// clone the old element with the props (and children) of the new element
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// 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);
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} else {
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// new element. If we have a startStyle, use that as the style and go through
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// the enter animations
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const newProps = {};
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const restingStyle = c.props.style;
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const startStyles = this.props.startStyles;
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if (startStyles.length > 0) {
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const startStyle = startStyles[0];
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newProps.style = startStyle;
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// console.log("mounted@startstyle0: "+JSON.stringify(startStyle));
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}
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newProps.ref = ((n) => this._collectNode(
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c.key, n, restingStyle,
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));
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this.children[c.key] = React.cloneElement(c, newProps);
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}
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});
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}
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_collectNode(k, node, restingStyle) {
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if (
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node &&
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this.nodes[k] === undefined &&
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this.props.startStyles.length > 0
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) {
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const startStyles = this.props.startStyles;
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const domNode = ReactDom.findDOMNode(node);
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// start from startStyle 1: 0 is the one we gave it
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// to start with, so now we animate 1 etc.
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for (let i = 1; i < startStyles.length; ++i) {
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this._applyStyles(domNode, startStyles[i]);
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// console.log("start:"
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// JSON.stringify(startStyles[i]),
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// );
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}
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// and then we animate to the resting state
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setTimeout(() => {
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this._applyStyles(domNode, restingStyle);
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}, 0);
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// console.log("enter:",
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// JSON.stringify(restingStyle));
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}
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this.nodes[k] = node;
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}
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render() {
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return (
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<>{ Object.values(this.children) }</>
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);
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}
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}
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