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;