src/components/app/sidebars/Sidebar.js


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import classNames from "classnames";
import React from "react";
import "./Sidebar.css";

class Sidebar extends React.Component {
    state = {
        collapsed: false
    };

    render() {
        const collapseButton = (
            <div
                className={classNames("sidebar-collapse-button", {"sidebar-collapse-button-right": this.props.isRight})}
                onClick={() => this.setState({collapsed: !this.state.collapsed})}
            >
                {(this.state.collapsed && this.props.isRight) || (!this.state.collapsed && !this.props.isRight) ?
                    <span className="fa fa-angle-left" title={this.props.isRight ? "Expand" : "Collapse"}/> :
                    <span className="fa fa-angle-right" title={this.props.isRight ? "Collapse" : "Expand"}/>
                }
            </div>
        );

        if (this.state.collapsed) {
            return collapseButton;
        }
        return (
            <div
                className={classNames("sidebar p-3 h-100", {"sidebar-right": this.props.isRight})}
                onWheel={e => e.stopPropagation()}
            >
                {this.props.children}
                {collapseButton}
            </div>
        );
    }
}

export default Sidebar;