mirror of
https://github.com/element-hq/element-web.git
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164 lines
6.5 KiB
JavaScript
164 lines
6.5 KiB
JavaScript
const React = require('react');
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const ReactDom = require('react-dom');
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import PropTypes from 'prop-types';
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const Velocity = require('velocity-vector');
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/**
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* The Velociraptor contains components and animates transitions with velocity.
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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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module.exports = React.createClass({
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displayName: 'Velociraptor',
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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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// a list of transition options from the corresponding startStyle
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enterTransitionOpts: PropTypes.array,
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},
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getDefaultProps: function() {
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return {
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startStyles: [],
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enterTransitionOpts: [],
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};
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},
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componentWillMount: function() {
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this.nodes = {};
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this._updateChildren(this.props.children);
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},
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componentWillReceiveProps: function(nextProps) {
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this._updateChildren(nextProps.children);
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},
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/**
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* update `this.children` according to the new list of children given
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*/
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_updateChildren: function(newChildren) {
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const self = this;
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const oldChildren = this.children || {};
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this.children = {};
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React.Children.toArray(newChildren).forEach(function(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(self.nodes[old.key]);
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if (oldNode && oldNode.style.left != c.props.style.left) {
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Velocity(oldNode, { left: c.props.style.left }, self.props.transition).then(function() {
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// special case visibility because it's nonsensical to animate an invisible element
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// 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') {
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oldNode.style.visibility = c.props.style.visibility;
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}
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});
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//console.log("translation: "+oldNode.style.left+" -> "+c.props.style.left);
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}
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if (oldNode && oldNode.style.visibility == 'hidden' && c.props.style.visibility == 'visible') {
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oldNode.style.visibility = c.props.style.visibility;
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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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self.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 = self.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) => self._collectNode(
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c.key, n, restingStyle,
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));
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self.children[c.key] = React.cloneElement(c, newProps);
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}
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});
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},
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/**
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* called when a child element is mounted/unmounted
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*
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* @param {string} k key of the child
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* @param {null|Object} node On mount: React node. On unmount: null
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* @param {Object} restingStyle final style
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*/
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_collectNode: function(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 transitionOpts = this.props.enterTransitionOpts;
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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 (var i = 1; i < startStyles.length; ++i) {
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Velocity(domNode, startStyles[i], transitionOpts[i-1]);
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/*
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console.log("start:",
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JSON.stringify(transitionOpts[i-1]),
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"->",
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JSON.stringify(startStyles[i]),
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);
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*/
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}
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// and then we animate to the resting state
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Velocity(domNode, restingStyle,
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transitionOpts[i-1])
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.then(() => {
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// once we've reached the resting state, hide the element if
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// appropriate
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domNode.style.visibility = restingStyle.visibility;
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});
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/*
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console.log("enter:",
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JSON.stringify(transitionOpts[i-1]),
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"->",
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JSON.stringify(restingStyle));
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*/
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} else if (node === null) {
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// Velocity stores data on elements using the jQuery .data()
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// method, and assumes you'll be using jQuery's .remove() to
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// remove the element, but we don't use jQuery, so we need to
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// blow away the element's data explicitly otherwise it will leak.
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// This uses Velocity's internal jQuery compatible wrapper.
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// See the bug at
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// https://github.com/julianshapiro/velocity/issues/300
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// and the FAQ entry, "Preventing memory leaks when
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// creating/destroying large numbers of elements"
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// (https://github.com/julianshapiro/velocity/issues/47)
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const domNode = ReactDom.findDOMNode(this.nodes[k]);
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if (domNode) Velocity.Utilities.removeData(domNode);
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}
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this.nodes[k] = node;
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},
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render: function() {
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return (
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<span>
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{ Object.values(this.children) }
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</span>
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);
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},
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});
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