类文档

WP_Widget_Media_Video

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概述

WP_Widget_Media_Video 是 WordPress 核心类,用于实现视频小部件,继承自 WP_Widget_Media。它支持从媒体库或外部服务(如 YouTube、Vimeo)加载视频,并提供前端渲染和管理功能。

关键要点

  • 继承自 WP_Widget_Media,专门处理视频内容,MIME 类型为 'video'。
  • 构造函数初始化小部件,设置本地化字符串,支持多语言。
  • get_instance_schema() 方法定义小部件实例的属性模式,包括预加载、循环和轨道等选项。
  • render_media() 方法负责前端视频渲染,支持附件、YouTube 和 Vimeo 链接,自动注入样式以适应侧边栏。
  • inject_video_max_width_style() 方法移除视频的固定高度和宽度,添加最大宽度样式以优化显示。
  • enqueue_admin_scripts() 和 enqueue_preview_scripts() 方法加载管理界面和预览所需的脚本。
  • render_control_template_scripts() 方法渲染表单模板脚本,扩展父类功能。

代码示例

// 示例:使用 WP_Widget_Media_Video 渲染视频
$video_widget = new WP_Widget_Media_Video();
$instance = array(
    'url' => 'https://example.com/video.mp4',
    'preload' => 'metadata',
    'loop' => false
);
$video_widget->render_media($instance);

注意事项

  • 视频小部件支持多种视频扩展格式,如 mp4、webm 等,通过 wp_get_video_extensions() 获取。
  • 前端渲染时,会自动处理 YouTube 和 Vimeo 的嵌入,使用 wp_video_shortcode 或 wp_oembed_get。
  • 样式注入确保视频在侧边栏中自适应,避免布局问题。

📄 原文内容

Core class that implements a video widget.

Description

See also

Methods

Name Description
WP_Widget_Media_Video::__construct Constructor.
WP_Widget_Media_Video::enqueue_admin_scripts Loads the required scripts and styles for the widget control.
WP_Widget_Media_Video::enqueue_preview_scripts Enqueue preview scripts.
WP_Widget_Media_Video::get_instance_schema Get schema for properties of a widget instance (item).
WP_Widget_Media_Video::inject_video_max_width_style Inject max-width and remove height for videos too constrained to fit inside sidebars on frontend.
WP_Widget_Media_Video::render_control_template_scripts Render form template scripts.
WP_Widget_Media_Video::render_media Render the media on the frontend.

Source

class WP_Widget_Media_Video extends WP_Widget_Media {

	/**
	 * Constructor.
	 *
	 * @since 4.8.0
	 */
	public function __construct() {
		parent::__construct(
			'media_video',
			__( 'Video' ),
			array(
				'description' => __( 'Displays a video from the media library or from YouTube, Vimeo, or another provider.' ),
				'mime_type'   => 'video',
			)
		);

		$this->l10n = array_merge(
			$this->l10n,
			array(
				'no_media_selected'          => __( 'No video selected' ),
				'add_media'                  => _x( 'Add Video', 'label for button in the video widget' ),
				'replace_media'              => _x( 'Replace Video', 'label for button in the video widget; should preferably not be longer than ~13 characters long' ),
				'edit_media'                 => _x( 'Edit Video', 'label for button in the video widget; should preferably not be longer than ~13 characters long' ),
				'missing_attachment'         => sprintf(
					/* translators: %s: URL to media library. */
					__( 'That video cannot be found. Check your <a href="%s">media library</a> and make sure it was not deleted.' ),
					esc_url( admin_url( 'upload.php' ) )
				),
				/* translators: %d: Widget count. */
				'media_library_state_multi'  => _n_noop( 'Video Widget (%d)', 'Video Widget (%d)' ),
				'media_library_state_single' => __( 'Video Widget' ),
				/* translators: %s: A list of valid video file extensions. */
				'unsupported_file_type'      => sprintf( __( 'Sorry, the video at the supplied URL cannot be loaded. Please check that the URL is for a supported video file (%s) or stream (e.g. YouTube and Vimeo).' ), '<code>.' . implode( ', .', wp_get_video_extensions() ) . '' ),
			)
		);
	}

	/**
	 * Get schema for properties of a widget instance (item).
	 *
	 * @since 4.8.0
	 *
	 * @see WP_REST_Controller::get_item_schema()
	 * @see WP_REST_Controller::get_additional_fields()
	 * @link https://core.trac.wordpress.org/ticket/35574
	 *
	 * @return array Schema for properties.
	 */
	public function get_instance_schema() {

		$schema = array(
			'preload' => array(
				'type'                  => 'string',
				'enum'                  => array( 'none', 'auto', 'metadata' ),
				'default'               => 'metadata',
				'description'           => __( 'Preload' ),
				'should_preview_update' => false,
			),
			'loop'    => array(
				'type'                  => 'boolean',
				'default'               => false,
				'description'           => __( 'Loop' ),
				'should_preview_update' => false,
			),
			'content' => array(
				'type'                  => 'string',
				'default'               => '',
				'sanitize_callback'     => 'wp_kses_post',
				'description'           => __( 'Tracks (subtitles, captions, descriptions, chapters, or metadata)' ),
				'should_preview_update' => false,
			),
		);

		foreach ( wp_get_video_extensions() as $video_extension ) {
			$schema[ $video_extension ] = array(
				'type'        => 'string',
				'default'     => '',
				'format'      => 'uri',
				/* translators: %s: Video extension. */
				'description' => sprintf( __( 'URL to the %s video source file' ), $video_extension ),
			);
		}

		return array_merge( $schema, parent::get_instance_schema() );
	}

	/**
	 * Render the media on the frontend.
	 *
	 * @since 4.8.0
	 *
	 * @param array $instance Widget instance props.
	 */
	public function render_media( $instance ) {
		$instance   = array_merge( wp_list_pluck( $this->get_instance_schema(), 'default' ), $instance );
		$attachment = null;

		if ( $this->is_attachment_with_mime_type( $instance['attachment_id'], $this->widget_options['mime_type'] ) ) {
			$attachment = get_post( $instance['attachment_id'] );
		}

		$src = $instance['url'];
		if ( $attachment ) {
			$src = wp_get_attachment_url( $attachment->ID );
		}

		if ( empty( $src ) ) {
			return;
		}

		$youtube_pattern = '#^https?://(?:www.)?(?:youtube.com/watch|youtu.be/)#';
		$vimeo_pattern   = '#^https?://(.+.)?vimeo.com/.*#';

		if ( $attachment || preg_match( $youtube_pattern, $src ) || preg_match( $vimeo_pattern, $src ) ) {
			add_filter( 'wp_video_shortcode', array( $this, 'inject_video_max_width_style' ) );

			echo wp_video_shortcode(
				array_merge(
					$instance,
					compact( 'src' )
				),
				$instance['content']
			);

			remove_filter( 'wp_video_shortcode', array( $this, 'inject_video_max_width_style' ) );
		} else {
			echo $this->inject_video_max_width_style( wp_oembed_get( $src ) );
		}
	}

	/**
	 * Inject max-width and remove height for videos too constrained to fit inside sidebars on frontend.
	 *
	 * @since 4.8.0
	 *
	 * @param string $html Video shortcode HTML output.
	 * @return string HTML Output.
	 */
	public function inject_video_max_width_style( $html ) {
		$html = preg_replace( '/sheight="d+"/', '', $html );
		$html = preg_replace( '/swidth="d+"/', '', $html );
		$html = preg_replace( '/(?get_instance_schema() as $field => $field_schema ) {
			$exported_schema[ $field ] = wp_array_slice_assoc( $field_schema, array( 'type', 'default', 'enum', 'minimum', 'format', 'media_prop', 'should_preview_update' ) );
		}
		wp_add_inline_script(
			$handle,
			sprintf(
				'wp.mediaWidgets.modelConstructors[ %s ].prototype.schema = %s;',
				wp_json_encode( $this->id_base, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ),
				wp_json_encode( $exported_schema, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES )
			)
		);

		wp_add_inline_script(
			$handle,
			sprintf(
				'
					wp.mediaWidgets.controlConstructors[ %1$s ].prototype.mime_type = %2$s;
					wp.mediaWidgets.controlConstructors[ %1$s ].prototype.l10n = _.extend( {}, wp.mediaWidgets.controlConstructors[ %1$s ].prototype.l10n, %3$s );
				',
				wp_json_encode( $this->id_base, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ),
				wp_json_encode( $this->widget_options['mime_type'], JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ),
				wp_json_encode( $this->l10n, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES )
			)
		);
	}

	/**
	 * Render form template scripts.
	 *
	 * @since 4.8.0
	 */
	public function render_control_template_scripts() {
		parent::render_control_template_scripts()
		?>
		
			
				l10n['missing_attachment'],
					array(
						'type'               => 'error',
						'additional_classes' => array( 'notice-alt', 'notice-missing-attachment' ),
					)
				);
				?>
			
				l10n['unsupported_file_type'],
					array(
						'type'               => 'error',
						'additional_classes' => array( 'notice-alt', 'notice-missing-attachment' ),
					)
				);
				?>
			
				 'error',
						'additional_classes' => array( 'notice-alt' ),
					)
				);
				?>
			
				
					
				
			
				
					
				
			
				
			
		
		

Changelog

Version Description
4.8.0 Introduced.