jvc0/react/features/desktop-picker/components/DesktopSourcePreview.tsx

import React, { Component } from 'react';
import { WithTranslation } from 'react-i18next';

import { translate } from '../../base/i18n/functions';


/**
 * The type of the React {@code Component} props of
 * {@link DesktopSourcePreview}.
 */
interface IProps extends WithTranslation {

    /**
     * The callback to invoke when the component is clicked. The id of the
     * clicked on DesktopCapturerSource will be passed in.
     */
    onClick: Function;

    /**
     * The callback to invoke when the component is double clicked. The id of
     * the DesktopCapturerSource will be passed in.
     */
    onDoubleClick: Function;

    /**
     * The indicator which determines whether this DesktopSourcePreview is
     * selected. If true, the 'is-selected' CSS class will be added to the root
     * of Component.
     */
    selected: boolean;

    /**
     * The DesktopCapturerSource to display.
     */
    source: any;

    /**
     * The source type of the DesktopCapturerSources to display.
     */
    type: string;
}

/**
 * React component for displaying a preview of a DesktopCapturerSource.
 *
 * @augments Component
 */
class DesktopSourcePreview extends Component<IProps> {
    /**
     * Initializes a new DesktopSourcePreview instance.
     *
     * @param {Object} props - The read-only properties with which the new
     * instance is to be initialized.
     */
    constructor(props: IProps) {
        super(props);

        this._onClick = this._onClick.bind(this);
        this._onDoubleClick = this._onDoubleClick.bind(this);
    }

    /**
     * Implements React's {@link Component#render()}.
     *
     * @inheritdoc
     * @returns {ReactElement}
     */
    render() {
        const selectedClass = this.props.selected ? 'is-selected' : '';
        const displayClasses = `desktop-picker-source ${selectedClass}`;

        return (
            <div
                className = { displayClasses }
                onClick = { this._onClick }
                onDoubleClick = { this._onDoubleClick }>
                {this._renderThumbnailImageContainer()}
                <div className = 'desktop-source-preview-label'>
                    { this.props.source.name }
                </div>
            </div>
        );
    }

    /**
     * Render thumbnail screenshare image.
     *
     * @returns {Object} - Thumbnail image.
     */
    _renderThumbnailImageContainer() {
        // default data URL for thumnbail image
        let srcImage = this.props.source.thumbnail.dataUrl;

        // legacy thumbnail image
        if (typeof this.props.source.thumbnail.toDataURL === 'function') {
            srcImage = this.props.source.thumbnail.toDataURL();
        }

        return (
            <div className = 'desktop-source-preview-image-container'>
                { this._renderThumbnailImage(srcImage) }
            </div>
        );

    }

    /**
     * Render thumbnail screenshare image.
     *
     * @param {string} src - Of the image.
     * @returns {Object} - Thumbnail image.
     */
    _renderThumbnailImage(src: string) {
        return (
            <img
                alt = { this.props.t('welcomepage.logo.desktopPreviewThumbnail') }
                className = 'desktop-source-preview-thumbnail'
                src = { src } />
        );
    }

    /**
     * Invokes the passed in onClick callback.
     *
     * @returns {void}
     */
    _onClick() {
        const { source, type } = this.props;

        this.props.onClick(source.id, type);
    }

    /**
     * Invokes the passed in onDoubleClick callback.
     *
     * @returns {void}
     */
    _onDoubleClick() {
        const { source, type } = this.props;

        this.props.onDoubleClick(source.id, type);
    }
}

export default translate(DesktopSourcePreview);