124 lines
3.6 KiB
JavaScript
124 lines
3.6 KiB
JavaScript
// Copyright (c) 2018 Dominic Masters
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//
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// MIT License
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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import React from 'react';
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import Styles from './ElementScrollFader.scss';
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export default class ElementScrollFader extends React.Component {
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constructor(props) {
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super(props);
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this.state = {
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waiting: true,
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visible: false
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};
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this.onScrollBound = this.onScroll.bind(this);
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this.updateRectangleBound = this.updateRectangle.bind(this);
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this.checkEffectBound = this.checkEffect.bind(this);
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this.rect = null;
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}
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componentDidMount() {
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//Update rectangle
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if(this.rectTimer) clearInterval(this.rectTimer);
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this.rectTimer = setInterval(this.updateRectangleBound, 100);
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if(!this.initialCheckFunction) {
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this.initialCheckFunction = setTimeout(this.checkEffectBound, 300);
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}
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document.addEventListener('scroll', this.onScrollBound, true);
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document.addEventListener("DOMContentLoaded", this.updateRectangleBound);
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}
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componentWillUnmount() {
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this.detachListener();
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}
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//Used for rect calculation
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updateRectangle() {
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if(!this.refs || !this.refs.fader) return;
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this.rect = this.refs.fader.getBoundingClientRect();
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}
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onScroll(e) {
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this.checkEffect();
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}
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//Common functions
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detachListener() {
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document.removeEventListener('scroll', this.onScrollBound);
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document.removeEventListener("DOMContentLoaded", this.updateRectangleBound);
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if(this.rectTimer) clearInterval(this.rectTimer);
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if(this.initialCheckFunction) clearTimeout(this.initialCheckFunction);
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}
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checkEffect() {
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if(typeof window === typeof undefined) return;
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if(!this.refs || !this.refs.fader) return;
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if(this.state.waiting) {
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this.setState({
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waiting: false
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});
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}
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if(this.state.visible) return this.detachListener();
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if(!this.rect) this.updateRectangle();
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//Get bounds
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var rect = this.rect;
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//If our top is at least half way UP the page, show
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if(rect.top > window.innerHeight / 1.5) return;
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this.setState({
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visible: true
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});
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this.detachListener();//stop Listening
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if(this.props.onVisible) {
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this.props.onVisible(this.refs.fader);
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}
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return true;
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}
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render() {
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let newProps = {...this.props};
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let { from, visible, waiting, className } = this.props;
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from = from || "top";
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["from","visible","waiting"].forEach(e => delete newProps[e]);
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let clazz = `o-element-scroll-fader from-${from}`;
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if(visible || waiting) clazz += " is-visible";
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if(className) clazz += ` ${className}`;
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return <div {...newProps} className={ clazz } ref="fader" />
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}
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}
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