halogen/SkewLoader.js

A collection of loading spinners with React.js

'use strict';

var React = require('react');
var assign = require('domkit/appendVendorPrefix');
var insertKeyframesRule = require('domkit/insertKeyframesRule');

/**
 * @type {Object}
 */
var keyframes = {
    '25%': {
        transform: 'perspective(100px) rotateX(180deg) rotateY(0)'
    },
    '50%': {
        transform: 'perspective(100px) rotateX(180deg) rotateY(180deg)'
    },
    '75%': {
        transform: 'perspective(100px) rotateX(0) rotateY(180deg)'
    },
    '100%': {
        transform: 'perspective(100px) rotateX(0) rotateY(0)'
    }
};

/**
 * @type {String}
 */
var animationName = insertKeyframesRule(keyframes);

var Loader = React.createClass({
    displayName: 'Loader',

    /**
     * @type {Object}
     */
    propTypes: {
        loading: React.PropTypes.bool,
        color: React.PropTypes.string,
        size: React.PropTypes.string
    },

    /**
     * @return {Object}
     */
    getDefaultProps: function getDefaultProps() {
        return {
            loading: true,
            color: '#ffffff',
            size: '20px'
        };
    },

    /**
     * @return {Object}
     */
    getSharpStyle: function getSharpStyle() {
        return {
            width: 0,
            height: 0,
            borderLeft: this.props.size + ' solid transparent',
            borderRight: this.props.size + ' solid transparent',
            borderBottom: this.props.size + ' solid ' + this.props.color,
            verticalAlign: this.props.verticalAlign
        };
    },

    /**
     * @param  {Number} i
     * @return {Object}
     */
    getAnimationStyle: function getAnimationStyle(i) {
        var animation = [animationName, '3s', '0s', 'infinite', 'cubic-bezier(.09,.57,.49,.9)'].join(' ');
        var animationFillMode = 'both';

        return {
            animation: animation,
            animationFillMode: animationFillMode
        };
    },

    /**
     * @param  {Number} i
     * @return {Object}
     */
    getStyle: function getStyle(i) {
        return assign(this.getSharpStyle(i), this.getAnimationStyle(i), {
            display: 'inline-block'
        });
    },

    /**
     * @param  {Boolean} loading
     * @return {ReactComponent || null}
     */
    renderLoader: function renderLoader(loading) {
        if (loading) {
            return React.createElement(
                'div',
                { id: this.props.id, className: this.props.className },
                React.createElement('div', { style: this.getStyle() })
            );
        };

        return null;
    },

    render: function render() {
        return this.renderLoader(this.props.loading);
    }
});

module.exports = Loader;