78 lines
2.3 KiB
JavaScript
78 lines
2.3 KiB
JavaScript
// Copyright (c) 2018 Dominic Masters
|
|
//
|
|
// MIT License
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining
|
|
// a copy of this software and associated documentation files (the
|
|
// "Software"), to deal in the Software without restriction, including
|
|
// without limitation the rights to use, copy, modify, merge, publish,
|
|
// distribute, sublicense, and/or sell copies of the Software, and to
|
|
// permit persons to whom the Software is furnished to do so, subject to
|
|
// the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be
|
|
// included in all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
import React from 'react';
|
|
|
|
class ElementScrollFader extends React.Component {
|
|
constructor(props) {
|
|
super(props);
|
|
|
|
this.state = { visible: false };
|
|
this.onScrollBound = this.onScroll.bind(this);
|
|
}
|
|
|
|
componentDidMount() {
|
|
document.addEventListener('scroll', this.onScrollBound, true);
|
|
}
|
|
|
|
onScroll(e) {
|
|
//Get bounds
|
|
var rect = this.refs.fader.getBoundingClientRect();
|
|
//If our top is at least half way UP the page, show
|
|
if(rect.top > window.innerHeight / 2) return;
|
|
this.setState({visible: true});
|
|
this.detachListener();//stop Listening
|
|
}
|
|
|
|
componentWillUnmount() {
|
|
this.detachListener();
|
|
}
|
|
|
|
detachListener() {
|
|
document.removeEventListener('scroll', this.onScrollBound);
|
|
}
|
|
|
|
render() {
|
|
let clazz = "o-element-scroll-fader";
|
|
|
|
if(this.props.from) {
|
|
clazz += " from-" + this.props.from
|
|
} else {
|
|
clazz += " from-top";
|
|
}
|
|
if(this.state.visible) {
|
|
clazz += " is-visible";
|
|
}
|
|
|
|
if(this.props.className) clazz += " " + this.props.className;
|
|
|
|
return (
|
|
<div className={ clazz } ref="fader">
|
|
{ this.props.children}
|
|
</div>
|
|
);
|
|
}
|
|
}
|
|
|
|
export default ElementScrollFader;
|