WP_Customize_Theme_Control

class WP_Customize_Theme_Control extends WP_Customize_Control {

	/**
	 * Customize control type.
	 *
	 * @since WP-4.2.0
	 * @var string
	 */
	public $type = 'theme';

	/**
	 * Theme object.
	 *
	 * @since WP-4.2.0
	 * @var WP_Theme
	 */
	public $theme;

	/**
	 * Refresh the parameters passed to the JavaScript via JSON.
	 *
	 * @since WP-4.2.0
	 *
	 * @see WP_Customize_Control::to_json()
	 */
	public function to_json() {
		parent::to_json();
		$this->json['theme'] = $this->theme;
	}

	/**
	 * Don't render the control content from PHP, as it's rendered via JS on load.
	 *
	 * @since WP-4.2.0
	 */
	public function render_content() {}

	/**
	 * Render a JS template for theme display.
	 *
	 * @since WP-4.2.0
	 */
	public function content_template() {
		/* translators: %s: theme name */
		$details_label = sprintf( __( 'Details for theme: %s' ), '{{ data.theme.name }}' );
		/* translators: %s: theme name */
		$customize_label = sprintf( __( 'Customize theme: %s' ), '{{ data.theme.name }}' );
		/* translators: %s: theme name */
		$preview_label = sprintf( __( 'Live preview theme: %s' ), '{{ data.theme.name }}' );
		/* translators: %s: theme name */
		$install_label = sprintf( __( 'Install and preview theme: %s' ), '{{ data.theme.name }}' );
		?>
		<# if ( data.theme.active ) { #>
			<div class="theme active" tabindex="0" aria-describedby="{{ data.section }}-{{ data.theme.id }}-action">
		<# } else { #>
			<div class="theme" tabindex="0" aria-describedby="{{ data.section }}-{{ data.theme.id }}-action">
		<# } #>

			<# if ( data.theme.screenshot && data.theme.screenshot[0] ) { #>
				<div class="theme-screenshot">
					<img data-src="{{ data.theme.screenshot[0] }}" alt="" />
				</div>
			<# } else { #>
				<div class="theme-screenshot blank"></div>
			<# } #>

			<span class="more-details theme-details" id="{{ data.section }}-{{ data.theme.id }}-action" aria-label="<?php echo esc_attr( $details_label ); ?>"><?php _e( 'Theme Details' ); ?></span>

			<div class="theme-author"><?php
				/* translators: Theme author name */
				printf( _x( 'By %s', 'theme author' ), '{{ data.theme.author }}' );
			?></div>

			<# if (
				( 'installed' === data.theme.type && data.theme.hasUpdate ) ||
				data.theme.preferredChildName
			) { #>
				<div class="notices">
					<# if ( 'installed' === data.theme.type && data.theme.hasUpdate ) { #>
						<div class="update-message notice inline notice-warning notice-alt" data-slug="{{ data.theme.id }}">
							<p><?php
								/* translators: Notice text */
								_e( 'New version available.' );
								?> <button class="button-link update-theme" type="button"><?php
									/* translators: Button text */
									_e( 'Update now' );
								?></button>
							</p>
						</div>
					<# } #>

					<# if ( data.theme.preferredChildName ) { #>
						<div class="notice inline notice-info notice-alt"><p><?php printf(
								/* translators: %s: ClassicPress child theme name */
								__( 'Use the "%s" child theme instead!' ),
								'{{ data.theme.preferredChildName }}'
							); ?>
							<span class="cut"><?php
								/* translators: Advanced part of the ClassicPress child theme notice text, hidden on mobiles */
								_e( 'This is a parent theme that says "Powered by WordPress" in its footer.' );
							?></span>
						</p></div>
					<# } #>
				</div>
			<# } #>

			<# if ( data.theme.active ) { #>
				<div class="theme-id-container">
					<h3 class="theme-name" id="{{ data.section }}-{{ data.theme.id }}-name">
						<?php
						/* translators: %s: theme name */
						printf( __( '<span>Previewing:</span> %s' ), '{{ data.theme.name }}' );
						?>
					</h3>
					<div class="theme-actions">
						<button type="button" class="button button-primary customize-theme" aria-label="<?php echo esc_attr( $customize_label ); ?>"><?php _e( 'Customize' ); ?></button>
					</div>
				</div>
				<div class="notice notice-success notice-alt"><p><?php _ex( 'Installed', 'theme' ); ?></p></div>
			<# } else if ( 'installed' === data.theme.type ) { #>
				<div class="theme-id-container">
					<h3 class="theme-name" id="{{ data.section }}-{{ data.theme.id }}-name">{{ data.theme.name }}</h3>
					<div class="theme-actions">
						<button type="button" class="button button-primary preview-theme" aria-label="<?php echo esc_attr( $preview_label ); ?>" data-slug="{{ data.theme.id }}"><?php _e( 'Live Preview' ); ?></button>
					</div>
				</div>
				<div class="notice notice-success notice-alt"><p><?php _ex( 'Installed', 'theme' ); ?></p></div>
			<# } else { #>
				<div class="theme-id-container">
					<h3 class="theme-name" id="{{ data.section }}-{{ data.theme.id }}-name">{{ data.theme.name }}</h3>
					<div class="theme-actions">
						<button type="button" class="button button-primary theme-install preview" aria-label="<?php echo esc_attr( $install_label ); ?>" data-slug="{{ data.theme.id }}" data-name="{{ data.theme.name }}"><?php _e( 'Install &amp; Preview' ); ?></button>
					</div>
				</div>
			<# } #>
		</div>
	<?php
	}
}