kepler.gl
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kepler.gl is a webgl based application to visualize large scale location data in the browser
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JavaScript
// Copyright (c) 2020 Uber Technologies, Inc.
//
// 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 styled from 'styled-components';
/*
ScrollSync works by getting a callback about the dom elements scroll amount
and then using that to pass into how much to scroll all child components,
it works great!
Except... Because scrolling is managed by a separate thread, and JavaScript
is only periodically notified of the updated position, there's some latency
issues with this.
We can hack around this by using a niche property of canvas that removes the
delay in scroll event firing! Easiest way to reproduce: enable "Trace React updates"
in React DevTools (it works by overlaying a viewport-wide canvas over the document).
*/
export default styled.canvas`
height: 100%;
left: 0;
pointer-events: none;
position: absolute;
top: 0;
width: 100%;
`;