arduino-ide/arduino-ide-extension/src/browser/components/arduino-select.tsx

import * as React from 'react';
import Select from 'react-select';
import { Styles } from 'react-select/src/styles';
import { Props } from 'react-select/src/components';
import { ThemeConfig } from 'react-select/src/theme';

export class ArduinoSelect<T> extends Select<T> {

    constructor(props: Readonly<Props<T>>) {
        super(props);
    }

    render(): React.ReactNode {
        const controlHeight = 27; // from `monitor.css` -> `.serial-monitor-container .head` (`height: 27px;`)
        const styles: Styles = {
            control: styles => ({
                ...styles,
                minWidth: 120,
                color: 'var(--theia-ui-font-color1)'
            }),
            dropdownIndicator: styles => ({
                ...styles,
                padding: 0
            }),
            indicatorSeparator: () => ({
                display: 'none'
            }),
            indicatorsContainer: () => ({
                padding: '0px 5px'
            }),
            menu: styles => ({
                ...styles,
                marginTop: 0
            })
        };
        const theme: ThemeConfig = theme => ({
            ...theme,
            borderRadius: 0,
            spacing: {
                controlHeight,
                baseUnit: 2,
                menuGutter: 4
            }, colors: {
                ...theme.colors,
                // `primary50`??? it's crazy but apparently, without this, we would get a light-blueish
                // color when selecting an option in the select by clicking and then not releasing the button.
                // https://react-select.com/styles#overriding-the-theme
                primary50: 'var(--theia-accent-color4)',
            }
        });
        const DropdownIndicator = () => <span className='fa fa-caret-down caret' />;
        return <Select
            {...this.props}
            components={{ DropdownIndicator }}
            theme={theme}
            styles={styles}
            classNamePrefix='arduino-select'
            isSearchable={false}
        />
    }

}