162 lines
4.9 KiB
JavaScript
162 lines
4.9 KiB
JavaScript
// "Generic dropdown component"
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// Renders something and then when that "something" is focused renders a popup layer next to it
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// For example, a text input with a popup selection list
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// ...Or maybe a button with a popup menu
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// License: LGPLv3.0+
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// (c) Vitaliy Filippov 2019+
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// Version 2020-04-27
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import React from 'react';
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import ReactDOM from 'react-dom';
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import PropTypes from 'prop-types';
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export default class Picker extends React.Component
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{
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static propTypes = {
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direction: PropTypes.string,
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clearOnClick: PropTypes.bool,
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minWidth: PropTypes.number,
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className: PropTypes.string,
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style: PropTypes.object,
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renderInput: PropTypes.func.isRequired,
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renderPicker: PropTypes.func.isRequired,
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}
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state = {
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focused: false,
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height: 0,
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width: 0,
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top: 0,
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left: 0,
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}
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focus = () =>
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{
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if (!this.state.focused)
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{
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this.setState({ focused: true, height: 0 });
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this.calculateDirection();
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if (this.props.clearOnClick)
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{
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document.body.addEventListener('click', this.blurExt);
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}
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}
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}
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blur = () =>
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{
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this.setState({ focused: false });
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if (this.props.clearOnClick)
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{
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document.body.removeEventListener('click', this.blurExt);
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}
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}
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blurExt = (ev) =>
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{
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let n = this.input ? ReactDOM.findDOMNode(this.input) : null;
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let e = ev.target||ev.srcElement;
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while (e)
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{
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// calendar-box is calendar.js's class
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if (e == this.picker || e == n || /\bcalendar-box\b/.exec(e.className||''))
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{
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return;
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}
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e = e.parentNode;
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}
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this.blur();
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}
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setInput = (e) =>
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{
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this.input = e;
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}
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setPicker = (e) =>
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{
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this.picker = e;
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}
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getInputProps()
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{
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return {
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onFocus: this.focus,
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onBlur: this.blur,
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focused: this.state.focused,
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ref: this.setInput,
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};
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}
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renderPicker()
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{
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return this.props.renderPicker();
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}
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render()
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{
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return (<React.Fragment>
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{this.props.renderInput(this.getInputProps())}
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{this.state.focused
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? <div style={{
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position: 'fixed',
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background: 'white',
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height: this.state.height ? this.state.height+'px' : 'auto',
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top: this.state.top+'px',
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width: this.state.width ? this.state.width+'px' : 'auto',
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left: this.state.left+'px',
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zIndex: 100,
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}} ref={this.setPicker}>
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{this.renderPicker()}
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</div>
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: null}
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</React.Fragment>);
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}
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componentDidUpdate()
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{
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if (this.state.focused && !this.state.height)
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{
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this.calculateDirection();
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}
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}
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calculateDirection()
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{
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if (!this.input || !this.picker)
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{
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return;
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}
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const picker_size = ReactDOM.findDOMNode(this.picker).getBoundingClientRect();
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const client = ReactDOM.findDOMNode(this.input).getBoundingClientRect();
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const screen_width = window.innerWidth || document.documentElement.offsetWidth;
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const screen_height = window.innerHeight || document.documentElement.offsetHeight;
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let direction = this.props.direction;
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if (!direction || direction === 'auto')
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{
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const down = client.top + picker_size.height < screen_height;
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direction = down ? 'down' : 'up';
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}
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let top = client.top
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+ (window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop)
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- (document.documentElement.clientTop || document.body.clientTop || 0);
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const max_height = (direction == 'down' ? screen_height-top-client.height-32 : top-32);
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const height = picker_size.height < max_height ? picker_size.height : max_height;
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top = direction == 'down' ? (top + client.height) : (top - height);
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let left = (client.left
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+ (window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft)
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- (document.documentElement.clientLeft || document.body.clientLeft || 0));
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if (left + picker_size.width > screen_width)
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{
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left = screen_width - picker_size.width;
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}
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let width = client.width > picker_size.width ? client.width : picker_size.width;
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width = (this.props.minWidth && width < this.props.minWidth ? this.props.minWidth : width);
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if (this.state.top !== top || this.state.left !== left ||
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this.state.width !== width || this.state.height !== height)
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{
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this.setState({ top, left, width, height });
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}
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}
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}
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