5735d948f5
* onClick to onTouchTap #3556 * onClick to onTouchTap 2 #3556 * Registry dApp clear input + check Signer #3557
72 lines
1.9 KiB
JavaScript
72 lines
1.9 KiB
JavaScript
// Copyright 2015, 2016 Ethcore (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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import React, { Component } from 'react';
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import IconButton from 'material-ui/IconButton';
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import ArrowUpwardIcon from 'material-ui/svg-icons/navigation/arrow-upward';
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import { scrollTo } from './util';
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import styles from './ScrollTopButton.css';
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const scrollTopThreshold = 600;
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export default class ScrollTopButton extends Component {
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state = {}
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componentDidMount () {
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window.addEventListener('scroll', this.handleScroll);
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}
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componentWillUnmount () {
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window.removeEventListener('scroll', this.handleScroll);
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}
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_scrollToTop () {
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scrollTo(document.body, 0, 500);
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}
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render () {
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let hiddenClass = !this.state.showScrollButton ? styles.hidden : '';
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return (
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<IconButton
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className={ `${styles.scrollButton} ${hiddenClass}` }
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onTouchTap={ this._scrollToTop }>
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<ArrowUpwardIcon />
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</IconButton>
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);
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}
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handleScroll = event => {
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let { scrollTop } = event.srcElement.body;
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let { showScrollButton } = this.state;
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if (!showScrollButton && scrollTop > scrollTopThreshold) {
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this.setState({
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showScrollButton: true
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});
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}
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if (showScrollButton && scrollTop < scrollTopThreshold) {
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this.setState({
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showScrollButton: false
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});
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}
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}
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}
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