Show latest content block

<?php

// First create the widget for the admin panel
class custom_post_widget extends WP_Widget {
	function custom_post_widget() {
		$widget_ops = array('description' => __('Displays custom post content in a widget', 'custom-post-widget'));
		$this->WP_Widget('custom_post_widget', __('Content Block', 'custom-post-widget'), $widget_ops);
	}

	function form($instance) {
		$custom_post_id = esc_attr($instance['custom_post_id']);
		$show_custom_post_title  = isset($instance['show_custom_post_title ']) ? $instance['show_custom_post_title '] : true; ?>

		<p>
			<label for="<?php echo $this->get_field_id('custom_post_id'); ?>"> <?php echo __('Content Block to Display:', 'custom-post-widget') ?>
				<select class="widefat" id="<?php echo $this->get_field_id('custom_post_id'); ?>" name="<?php echo $this->get_field_name('custom_post_id'); ?>">
				<?php query_posts('post_type=content_block&orderby=ID&order=ASC&showposts=-1');
				if ( have_posts() ) : while ( have_posts() ) : the_post();
					$currentID = get_the_ID();
					if($currentID == $custom_post_id)
						$extra = 'selected' and
						$widgetExtraTitle = get_the_title();
					else
						$extra = '';
						echo '<option value="'.$currentID.'" '.$extra.'>'.get_the_title().'</option>';
					endwhile; else:
					echo '<option value="empty">' . __('No content blocks available', 'custom-post-widget') . '</option>';
				endif; ?>
				</select>
			</label>
		</p>
		<input type="hidden" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo $widgetExtraTitle; ?>" />
				<?php wp_reset_query(); ?>
		<p>
			<input class="checkbox" type="checkbox" <?php checked( (bool) $instance['show_custom_post_title'], true ); ?> id="<?php echo $this->get_field_id( 'show_custom_post_title' ); ?>" name="<?php echo $this->get_field_name( 'show_custom_post_title' ); ?>" />
			<label for="<?php echo $this->get_field_id( 'show_custom_post_title' ); ?>"><?php echo __('Show Post Title', 'custom-post-widget') ?></label>
		</p> <?php
	}

	function update($new_instance, $old_instance) {
		$instance = $old_instance;
		$instance['custom_post_id'] = strip_tags($new_instance['custom_post_id']);
		$instance['show_custom_post_title'] = $new_instance['show_custom_post_title'];
		return $instance;
	}

	function widget($args, $instance) {
		extract($args);
		$custom_post_id  = ( $instance['custom_post_id'] != '' ) ? esc_attr($instance['custom_post_id']) : __('Find', 'custom-post-widget');
		// Variables from the widget settings.
		$show_custom_post_title = isset( $instance['show_custom_post_title'] ) ? $instance['show_custom_post_title'] : false;
		//$content_post = get_post($custom_post_id);
		$args = array(
	       	'post_status'=> 'publish',
	       	'post_type'=>'content_block',
			'orderby' => 'post_date',
			'order' => 'DESC',
			'numberposts' => 1
	    );

		$get_posts = null;
	    $get_posts = new WP_Query();

	    $get_posts->query($args);
		if ( $get_posts->have_posts() ) : while ( $get_posts->have_posts() ) : $get_posts->the_post();

			echo $before_widget;
			if ( $show_custom_post_title ) {
				echo $before_title . get_the_title() . $after_title; // This is the line that displays the title (only if show title is set)
			}
			echo the_content(); // This is where the actual content of the custom post is being displayed

		echo $after_widget;

		endwhile; endif;
	}

}

// Create the Content Block custom post type
add_action('init', 'my_content_block_post_type_init');

function my_content_block_post_type_init() {
	$labels = array(
		'name' => _x('Content Blocks', 'post type general name', 'custom-post-widget'),
		'singular_name' => _x('Content Block', 'post type singular name', 'custom-post-widget'),
		'plural_name' => _x('Content Blocks', 'post type plural name', 'custom-post-widget'),
		'add_new' => _x('Add Content Block', 'block', 'custom-post-widget'),
		'add_new_item' => __('Add New Content Block', 'custom-post-widget'),
		'edit_item' => __('Edit Content Block', 'custom-post-widget'),
		'new_item' => __('New Content Block', 'custom-post-widget'),
		'view_item' => __('View Content Block', 'custom-post-widget'),
		'search_items' => __('Search Content Blocks', 'custom-post-widget'),
		'not_found' =>  __('No Content Blocks Found', 'custom-post-widget'),
		'not_found_in_trash' => __('No Content Blocks found in Trash', 'custom-post-widget'),
		'parent_item_colon' => ''
	);
	$options = array(
		'labels' => $labels,
		'public' => false,
		'publicly_queryable' => false,
		'exclude_from_search' => true,
		'show_ui' => true,
		'query_var' => true,
		'rewrite' => true,
		'capability_type' => 'post',
		'hierarchical' => false,
		'menu_position' => null,
		'supports' => array('title','editor','revisions','thumbnail','author')
	);
	register_post_type('content_block',$options);
}

// Add custom styles to admin screen and menu
add_action('admin_head', 'content_block_header');

function content_block_header() {
	global $post_type; ?>
	<style type="text/css">
	<!--
	<?php if (($post_type == 'content_block')) : ?>
		#icon-edit { background:transparent url('<?php echo CUSTOM_POST_WIDGET_URL; ?>images/contentblock-32.png') no-repeat 0 0 !important; }
	<?php endif; ?>
		#adminmenu #menu-posts-content_block div.wp-menu-image{background:transparent url('<?php echo CUSTOM_POST_WIDGET_URL;?>images/contentblock.png') no-repeat center -32px;}
		#adminmenu #menu-posts-content_block:hover div.wp-menu-image,#adminmenu #menu-posts-content_block.wp-has-current-submenu div.wp-menu-image{background:transparent url('<?php echo CUSTOM_POST_WIDGET_URL;?>images/contentblock.png') no-repeat center 0px;}
	-->
	</style>
<?php
}

add_filter('post_updated_messages', 'content_block_messages');

function content_block_messages( $messages ) {
	$messages['content_block'] = array(
		0 => '',
		1 => sprintf( __('Content Block updated. <a href="%s">View Content Block</a>', 'custom-post-widget'), esc_url( get_permalink(isset($post->ID) ? $post->ID : null) ) ),
		2 => __('Custom field updated.', 'custom-post-widget'),
		3 => __('Custom field deleted.', 'custom-post-widget'),
		4 => __('Content Block updated.', 'custom-post-widget'),
		5 => isset($_GET['revision']) ? sprintf( __('Content Block restored to revision from %s', 'custom-post-widget'), wp_post_revision_title( (int) $_GET['revision'], false ) ) : false,
		6 => sprintf( __('Content Block published. <a href="%s">View Content Block</a>', 'custom-post-widget'), esc_url( get_permalink(isset($post->ID) ? $post->ID : null) ) ),
		7 => __('Block saved.', 'custom-post-widget'),
		8 => sprintf( __('Content Block submitted. <a target="_blank" href="%s">Preview Content Block</a>', 'custom-post-widget'), esc_url( add_query_arg( 'preview', 'true', get_permalink(isset($post->ID) ? $post->ID : null) ) ) ),
		9 => sprintf( __('Content Block scheduled for: <strong>%1$s</strong>. <a target="_blank" href="%2$s">Preview block</a>', 'custom-post-widget'), date_i18n( __( 'M j, Y @ G:i' , 'custom-post-widget'), strtotime(isset($post->post_date) ? $post->post_date : null) ), esc_url( get_permalink(isset($post->ID) ? $post->ID : null) ) ),
		10 => sprintf( __('Content Block draft updated. <a target="_blank" href="%s">Preview Content Block</a>', 'custom-post-widget'), esc_url( add_query_arg( 'preview', 'true', get_permalink(isset($post->ID) ? $post->ID : null) ) ) ),
	);
	return $messages;
}

// Add the ability to display the content block in a reqular post using a shortcode
function custom_post_widget_shortcode($atts) {
	extract(shortcode_atts(array(
		'id' => '',
	), $atts));

	$content = "";

	if($id != "") {
		$args = array(
			'post__in' => array($id),
			'post_type' => 'content_block',
			'post_status'=>'publish'
		);

		$content_post = get_posts($args);

		foreach( $content_post as $post ) :
			$content .= apply_filters('the_content', $post->post_content);
		endforeach;
	}

	return $content;
}

add_shortcode('content_block', 'custom_post_widget_shortcode');

// Add button above editor
function add_content_block_icon($initcontext) {
	return $initcontext.
	'<a id="add_content_block" style="text-decoration:none;" class="thickbox" title="' . __("Add Content Block", 'custom-post-widget') . '" href="' . CUSTOM_POST_WIDGET_URL . 'popup.php?type=add_content_block_popup&amp;TB_inline=true&amp;inlineId=content_block_form">
		<img onclick="return false;" alt="' . __("Add Content Block", 'custom-post-widget') . '" src="' . CUSTOM_POST_WIDGET_URL . 'images/contentblock-13.png">
	</a>';
}

add_filter('media_buttons_context', 'add_content_block_icon');

require_once( CUSTOM_POST_WIDGET_DIR . '/popup.php' );

if(!defined( 'CUSTOM_POST_WIDGET_CURRENT_PAGE' ))
	define( 'CUSTOM_POST_WIDGET_CURRENT_PAGE', basename($_SERVER['PHP_SELF']) );
if(in_array(CUSTOM_POST_WIDGET_CURRENT_PAGE, array('post.php', 'page.php', 'page-new.php', 'post-new.php'))) {
	add_action('admin_footer', 'add_content_block_popup');
}
?>