Source

File: wp-admin/includes/class-wp-theme-install-list-table.php

public function single_row( $theme ) {
		global $themes_allowedtags;

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

		$name   = wp_kses( $theme->name, $themes_allowedtags );
		$author = wp_kses( $theme->author, $themes_allowedtags );

		/* translators: %s: Theme name. */
		$preview_title = sprintf( __( 'Preview “%s”' ), $name );
		$preview_url   = add_query_arg(
			array(
				'tab'   => 'theme-information',
				'theme' => $theme->slug,
			),
			self_admin_url( 'theme-install.php' )
		);

		$actions = array();

		$install_url = add_query_arg(
			array(
				'action' => 'install-theme',
				'theme'  => $theme->slug,
			),
			self_admin_url( 'update.php' )
		);

		$update_url = add_query_arg(
			array(
				'action' => 'upgrade-theme',
				'theme'  => $theme->slug,
			),
			self_admin_url( 'update.php' )
		);

		$status = $this->_get_theme_status( $theme );

		switch ( $status ) {
			case 'update_available':
				$actions[] = sprintf(
					'<a class="install-now" href="%s" title="%s">%s</a>',
					esc_url( wp_nonce_url( $update_url, 'upgrade-theme_' . $theme->slug ) ),
					/* translators: %s: Theme version. */
					esc_attr( sprintf( __( 'Update to version %s' ), $theme->version ) ),
					__( 'Update' )
				);
				break;
			case 'newer_installed':
			case 'latest_installed':
				$actions[] = sprintf(
					'<span class="install-now" title="%s">%s</span>',
					esc_attr__( 'This theme is already installed and is up to date' ),
					_x( 'Installed', 'theme' )
				);
				break;
			case 'install':
			default:
				$actions[] = sprintf(
					'<a class="install-now" href="%s" title="%s">%s</a>',
					esc_url( wp_nonce_url( $install_url, 'install-theme_' . $theme->slug ) ),
					/* translators: %s: Theme name. */
					esc_attr( sprintf( _x( 'Install %s', 'theme' ), $name ) ),
					__( 'Install Now' )
				);
				break;
		}

		$actions[] = sprintf(
			'<a class="install-theme-preview" href="%s" title="%s">%s</a>',
			esc_url( $preview_url ),
			/* translators: %s: Theme name. */
			esc_attr( sprintf( __( 'Preview %s' ), $name ) ),
			__( 'Preview' )
		);

		/**
		 * Filters the install action links for a theme in the Install Themes list table.
		 *
		 * @since 3.4.0
		 *
		 * @param string[] $actions An array of theme action links. Defaults are
		 *                          links to Install Now, Preview, and Details.
		 * @param WP_Theme $theme   Theme object.
		 */
		$actions = apply_filters( 'theme_install_actions', $actions, $theme );

		?>
		<a class="screenshot install-theme-preview" href="<?php echo esc_url( $preview_url ); ?>" title="<?php echo esc_attr( $preview_title ); ?>">
			<img src="<?php echo esc_url( $theme->screenshot_url ); ?>" width="150" alt="" />
		</a>

		<h3><?php echo $name; ?></h3>
		<div class="theme-author">
		<?php
			/* translators: %s: Theme author. */
			printf( __( 'By %s' ), $author );
		?>
		</div>

		<div class="action-links">
			<ul>
				<?php foreach ( $actions as $action ) : ?>
					<li><?php echo $action; ?></li>
				<?php endforeach; ?>
				<li class="hide-if-no-js"><a href="#" class="theme-detail"><?php _e( 'Details' ); ?></a></li>
			</ul>
		</div>

		<?php
		$this->install_theme_info( $theme );
	}