Wordpress/wp-admin/widgets.php

<?php

require_once( 'admin.php' );

if ( ! current_user_can('switch_themes') )
	wp_die( __( 'Cheatin&#8217; uh?' ));

wp_enqueue_script( array( 'wp-lists', 'admin-widgets' ) );

do_action( 'sidebar_admin_setup' );

$title = __( 'Widgets' );
$parent_file = 'themes.php';

// $sidebar = What sidebar are we editing?
if ( isset($_GET['sidebar']) && isset($wp_registered_sidebars[$_GET['sidebar']]) ) {
	$sidebar = attribute_escape( $_GET['sidebar'] );
} elseif ( is_array($wp_registered_sidebars) && !empty($wp_registered_sidebars) ) {
	// By default we look at the first defined sidebar
	$sidebar = array_shift( array_keys($wp_registered_sidebars) );
} else {
	// If no sidebars, die.
	require_once( 'admin-header.php' );
?>

	<div class="error">
		<p><?php _e( 'No Sidebars Defined' ); ?></p>
	</div>

	<div class="wrap"> 
		<p><?php _e( 'You are seeing this message because the theme you are currently using isn&#8217;t widget-aware, meaning that it has no sidebars that you are able to change. For information on making your theme widget-aware, please <a href="http://automattic.com/code/widgets/themes/">follow these instructions</a>.' ); /* TODO: article on codex */; ?></p>
	</div>

<?php
	require_once( 'admin-footer.php' );
	exit;
}

// These are the widgets grouped by sidebar
$sidebars_widgets = wp_get_sidebars_widgets();
if ( empty( $sidebars_widgets ) )
	$sidebars_widgets = wp_get_widget_defaults();

// for the sake of PHP warnings
if ( empty( $sidebars_widgets[$sidebar] ) )
	$sidebars_widgets[$sidebar] = array();

$http_post = ( 'POST' == $_SERVER['REQUEST_METHOD'] );

// We're updating a sidebar
if ( $http_post && isset($sidebars_widgets[$_POST['sidebar']]) ) {

	/* Hack #1
	 * The widget_control is overloaded.  It updates the widget's options AND echoes out the widget's HTML form.
	 * Since we want to update before sending out any headers, we have to catchi it with an output buffer
	 */
	ob_start();
		/* There can be multiple widgets of the same type, but the widget_control for that
		 * widget type needs only be called once.
		 */
		$already_done = array();

		foreach ( $wp_registered_widget_controls as $name => $control ) {
			if ( in_array( $control['callback'], $already_done ) )
				continue;

			if ( is_callable( $control['callback'] ) )
				call_user_func_array( $control['callback'], $control['params'] );
		}
	ob_end_clean();

	// Prophylactic.  Take out empty ids.
	foreach ( (array) $_POST['widget-id'] as $key => $val )
		if ( !$val )
			unset($_POST['widget-id'][$key]);

	// Reset the key numbering and stare
	$new_sidebar = array_values( $_POST['widget-id'] );
	$sidebars_widgets[$_POST['sidebar']] = $new_sidebar;
	wp_set_sidebars_widgets( $sidebars_widgets );

	// Re-register just in case
	wp_widgets_init();

	wp_redirect( add_query_arg( 'message', 'updated' ) );
	exit;
}




// What widget (if any) are we editing
$edit_widget = -1;

$query_args = array('add', 'remove', 'key', 'edit', '_wpnonce', 'message' );

if ( isset($_GET['add']) && $_GET['add'] ) {
	// Add to the end of the sidebar
	if ( isset($wp_registered_widgets[$_GET['add']]) ) {
		check_admin_referer( "add-widget_$_GET[add]" );
		$sidebars_widgets[$sidebar][] = $_GET['add'];
		wp_set_sidebars_widgets( $sidebars_widgets );
	}
	wp_redirect( remove_query_arg( $query_args ) );
	exit;
} elseif ( isset($_GET['remove']) && $_GET['remove'] && isset($_GET['key']) && is_numeric($_GET['key']) ) {
	// Remove from sidebar the widget of type $_GET['remove'] and in position $_GET['key']
	$key = (int) $_GET['key'];
	if ( -1 < $key && ( $keys = array_keys($sidebars_widgets[$sidebar], $_GET['remove']) ) && in_array($key, $keys) ) {
		check_admin_referer( "remove-widget_$_GET[remove]" );
		unset($sidebars_widgets[$sidebar][$key]);
		$sidebars_widgets[$sidebar] = array_values($sidebars_widgets[$sidebar]);
		wp_set_sidebars_widgets( $sidebars_widgets );
	}
	wp_redirect( remove_query_arg( $query_args ) );
	exit;
} elseif ( isset($_GET['edit']) && $_GET['edit'] && isset($_GET['key']) && is_numeric($_GET['key']) ) {
	// Edit widget of type $_GET['edit'] and position $_GET['key']
	$key = (int) $_GET['key'];
	if ( -1 < $key && ( $keys = array_keys($sidebars_widgets[$sidebar], $_GET['edit']) ) && in_array($key, $keys) )
		$edit_widget = $key;
}

// Total number of registered sidebars
$sidebar_widget_count = count($sidebars_widgets[$sidebar]);

// This is sort of lame since "widget" won't be converted to "widgets" in the JS
if ( 1 < $sidebars_count = count($wp_registered_sidebars) )
	$sidebar_info_text = __ngettext( 'You are using %1$s widget in the "%2$s" sidebar.', 'You are using %1$s widgets in the "%2$s" sidebar.', $sidebar_widget_count );
else
	$sidebar_info_text = __ngettext( 'You are using %1$s widget in the sidebar.', 'You are using %1$s widgets in the sidebar.', $sidebar_widget_count );


$sidebar_info_text = sprintf( wp_specialchars( $sidebar_info_text ), "<span id='widget-count'>$sidebar_widget_count</span>", $wp_registered_sidebars[$sidebar]['name'] );

$page = isset($_GET['apage']) ? abs( (int) $_GET['apage'] ) : 1;

/* TODO: Paginate widgets list
$page_links = paginate_links( array(
	'base'    => add_query_arg( 'apage', '%#%' ),
	'format'  => '',
	'total'   => ceil(($total = 105 )/ 10),
	'current' => $page
));
*/
$page_links = false;

// Unsanitized!
$widget_search = isset($_GET['s']) ? $_GET['s'] : false;

// Not entirely sure what all should be here
$show_values = array(
	''       => $widget_search ? __( 'Show any widgets' ) : __( 'Show all widgets' ),
	'unused' => __( 'Show unused widgets' ),
	'used'   => __( 'Show used widgets' )
);

$show = isset($_GET['show']) && isset($show_values[$_GET['show']]) ? attribute_escape( $_GET['show'] ) : false;


$messages = array(
	'updated' => __('Changes saved.')
);

require_once( 'admin-header.php' );

if ( isset($_GET['message']) && isset($messages[$_GET['message']]) ) : ?>

<div id="message" class="updated fade"><p><?php echo $messages[$_GET['message']]; ?></p></div>

<?php endif; ?>

<div class="wrap">

	<form id="widgets-filter" action="" method="get">

	<h2><?php _e( 'Widgets' ); ?></h2>
	<p id="widget-search">
		<input type="text" id="widget-search-input" name="s" value="<?php echo attribute_escape( $widget_search ); ?>" />
		<input type="submit" value="<?php _e( 'Search Widgets' ); ?>" />
	</p>

	<div class="widget-liquid-left-holder">
	<div id="available-widgets-filter" class="widget-liquid-left">
		<h3><?php printf( __('Available Widgets %s'), '<a href="#help:avaliable-widgets" class="wp-context-help">?</a>' ); ?></h3>
		<p>
			<select name="show">
<?php foreach ( $show_values as $show_value => $show_text ) : $show_value = attribute_escape( $show_value ); ?>
				<option value='<?php echo $show_value; ?>'<?php selected( $show_value, $show ); ?>><?php echo wp_specialchars( $show_text ); ?></option>
<?php endforeach; ?>
			</select>
			<input type="submit" value="<?php _e('Show' ); ?>" />
		</p>
<?php if ( $page_links ) : ?>
		<p class="pagenav">
			<?php echo $page_links; ?>

		</p>
<?php endif; ?>
	</div>
	</div>

	<div id="available-sidebars" class="widget-liquid-right">
		<h3><?php printf( __('Current Widgets %s'), '<a href="#help:current-widgets" class="wp-context-help">?</a>' ); ?></h3>

<?php if ( 1 < $sidebars_count ) : ?>

		<p>
			<select id="sidebar-selector" name="sidebar">
<?php foreach ( $wp_registered_sidebars as $sidebar_id => $registered_sidebar ) : $sidebar_id = attribute_escape( $sidebar_id ); ?>
				<option value='<?php echo $sidebar_id; ?>'<?php selected( $sidebar_id, $sidebar ); ?>><?php echo wp_specialchars( $registered_sidebar['name'] ); ?></option>
<?php endforeach; ?>
			</select>
			<input type="submit" value="<?php _e('Go' ); ?>" />
		</p>

<?php endif; ?>

	</div>

	</form>

	<div id="widget-content" class="widget-liquid-left-holder">

		<div id="available-widgets" class="widget-liquid-left">

			<?php wp_list_widgets( $show, $widget_search ); // This lists all the widgets for the query ( $show, $search ) ?>

<?php if ( $page_links ) : ?>
			<p class="pagenav">
				<?php echo $page_links; ?>

			</p>
<?php endif; ?>

		</div>
	</div>

	<form id="widget-controls" action="" method="post">

	<div id="current-widgets-head" class="widget-liquid-right">

		<div id="sidebar-info">
			<p><?php echo $sidebar_info_text; ?></p>
			<p><?php _e( 'Add more from the Available Widgets section.' ); ?></p>
		</div>

	</div>

	<div id="current-widgets" class="widget-liquid-right">
		<input type="hidden" id='sidebar' name='sidebar' value="<?php echo $sidebar; ?>" />

		<div id="current-sidebar">

			<?php wp_list_widget_controls( $sidebars_widgets[$sidebar], $edit_widget ); // Show the control forms for each of the widgets in this sidebar ?>

		</div>
	</div>

	<p class="submit">
		<input type="hidden" id="generated-time" name="generated-time" value="<?php echo time(); ?>" />
		<input type="submit" name="save-widgets" value="<?php _e( 'Save Changes' ); ?>" />
	</p>

	</form>

</div>

<?php do_action( 'sidebar_admin_page' ); ?>

<?php require_once( 'admin-footer.php' ); ?>