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

<?php
/**
 * Theme Installer List Table class.
 *
 * @package WordPress
 * @subpackage List_Table
 * @since 3.1.0
 * @access private
 */
class WP_Theme_Install_List_Table extends WP_Themes_List_Table {

	var $features = array();

	function ajax_user_can() {
		return current_user_can( 'install_themes' );
	}

	function prepare_items() {
		include( ABSPATH . 'wp-admin/includes/theme-install.php' );

		global $tabs, $tab, $paged, $type, $theme_field_defaults;
		wp_reset_vars( array( 'tab' ) );

		$search_terms = array();
		$search_string = '';
		if ( ! empty( $_REQUEST['s'] ) ){
			$search_string = strtolower( stripslashes( $_REQUEST['s'] ) );
			$search_terms = array_unique( array_filter( array_map( 'trim', explode( ',', $search_string ) ) ) );
		}

		if ( ! empty( $_REQUEST['features'] ) )
			$this->features = $_REQUEST['features'];

		$paged = $this->get_pagenum();

		$per_page = 36;

		// These are the tabs which are shown on the page,
		$tabs = array();
		$tabs['dashboard'] = __( 'Search' );
		if ( 'search' == $tab )
			$tabs['search']	= __( 'Search Results' );
		$tabs['upload'] = __( 'Upload' );
		$tabs['featured'] = _x( 'Featured','Theme Installer' );
		//$tabs['popular']  = _x( 'Popular','Theme Installer' );
		$tabs['new']      = _x( 'Newest','Theme Installer' );
		$tabs['updated']  = _x( 'Recently Updated','Theme Installer' );

		$nonmenu_tabs = array( 'theme-information' ); // Valid actions to perform which do not have a Menu item.

		$tabs = apply_filters( 'install_themes_tabs', $tabs );
		$nonmenu_tabs = apply_filters( 'install_themes_nonmenu_tabs', $nonmenu_tabs );

		// If a non-valid menu tab has been selected, And its not a non-menu action.
		if ( empty( $tab ) || ( ! isset( $tabs[ $tab ] ) && ! in_array( $tab, (array) $nonmenu_tabs ) ) )
			$tab = key( $tabs );

		$args = array( 'page' => $paged, 'per_page' => $per_page, 'fields' => $theme_field_defaults );

		switch ( $tab ) {
			case 'search':
				$type = isset( $_REQUEST['type'] ) ? stripslashes( $_REQUEST['type'] ) : '';
				switch ( $type ) {
					case 'tag':
						$args['tag'] = array_map( 'sanitize_key', $search_terms );
						break;
					case 'term':
						$args['search'] = $search_string;
						break;
					case 'author':
						$args['author'] = $search_string;
						break;
				}

				if ( ! empty( $this->features ) ) {
					$args['tag'] = $this->features;
					$_REQUEST['s'] = implode( ',', $this->features );
					$_REQUEST['type'] = 'tag';
				}

				add_action( 'install_themes_table_header', 'install_theme_search_form' );
				break;

			case 'featured':
			//case 'popular':
			case 'new':
			case 'updated':
				$args['browse'] = $tab;
				break;

			default:
				$args = false;
		}

		if ( ! $args )
			return;

		$api = themes_api( 'query_themes', $args );

		if ( is_wp_error( $api ) )
			wp_die( $api->get_error_message() . '</p> <p><a href="#" onclick="document.location.reload(); return false;">' . __( 'Try again' ) . '</a>' );

		$this->items = $api->themes;

		$this->set_pagination_args( array(
			'total_items' => $api->info['results'],
			'per_page' => $per_page,
			'infinite_scroll' => true,
		) );
	}

	function no_items() {
		_e( 'No themes match your request.' );
	}

	function get_views() {
		global $tabs, $tab;

		$display_tabs = array();
		foreach ( (array) $tabs as $action => $text ) {
			$class = ( $action == $tab ) ? ' class="current"' : '';
			$href = self_admin_url('theme-install.php?tab=' . $action);
			$display_tabs['theme-install-'.$action] = "<a href='$href'$class>$text</a>";
		}

		return $display_tabs;
	}

	function display() {
		wp_nonce_field( "fetch-list-" . get_class( $this ), '_ajax_fetch_list_nonce' );
?>
		<div class="tablenav top themes">
			<div class="alignleft actions">
				<?php do_action( 'install_themes_table_header' ); ?>
			</div>
			<?php $this->pagination( 'top' ); ?>
			<img src="<?php echo esc_url( admin_url( 'images/wpspin_light.gif' ) ); ?>" class="ajax-loading list-ajax-loading" alt="" />
			<br class="clear" />
		</div>

		<div id="availablethemes">
			<?php $this->display_rows_or_placeholder(); ?>
		</div>

		<?php
		parent::tablenav( 'bottom' );
	}

	function display_rows() {
		$themes = $this->items;
		$theme_names = array_keys( $themes );

		foreach ( $theme_names as $theme_name ) {
				$class = array( 'available-theme' );
				?>
				<div class="<?php echo join( ' ', $class ); ?>"><?php
					if ( isset( $themes[$theme_name] ) )
						display_theme( $themes[$theme_name] );
				?></div>
		<?php } // end foreach $theme_names
	}

	/**
	 * Send required variables to JavaScript land
	 *
	 * @since 3.4
	 * @access private
	 *
	 * @uses $tab Global; current tab within Themes->Install screen
	 * @uses $type Global; type of search.
	 */
	function _js_vars() {
		global $tab, $type;		
		parent::_js_vars( compact( 'tab', 'type' ) );
	}
}