WordPress: Network-Wide Tips

gistfile1.aw

<?php
/*
Plugin Name: Network-Wide Tips
Description: Save multiple notices, only activate one at a time. Displayed across WP Network.
Author: Kailey Lampert
Author: http://kaileylampert.com
Version: 1.0
*/


new Network_Tips();

class Network_Tips {

	var $active_tip_default = array( 'id' => -1, 'content' => '' );

	function __construct() {
		add_action( 'init', array( &$this, 'register_tips_post_type' ) );
		add_action( 'admin_notices', array( &$this, 'tips_output' ) );
		add_action( 'network_admin_menu', array( &$this, 'tips_plug_pages' ) );
	}
	function register_tips_post_type() {
		/* we don't need to do much here
		 * it will have a custom mgmt page
		 * and will never appear on the front-end
		 */
		register_post_type( 'tip', array(
			'label' => 'Tips',
		) );
	}

	function tips_output() {
		/* display the tip
		 * it is saved to a site option
		 * which is available across the network
		 */
		$tip = get_site_option( 'active_tip', $this->active_tip_default );
		if ( $tip['id'] > 0 )
			echo "<div id='message' class='updated'><p>{$tip['content']}</p></div>";
	}

	function tips_plug_pages() {
		/* setup page in network admin (see hook)
		 */
		add_submenu_page( 'settings.php', 'Tips', 'Tips', 'unfiltered_html', 'manage-tips', array( &$this, 'tips_manage_output' ) );
	}

	function tips_manage_output() {
		/* our custom mgmt page
		 * add, edit, delete, and activate tips
		 */
		global $wpdb, $wp_roles, $current_site;

		/* first, the 'saving' actions
		 */
		$active_tip = get_site_option('active_tip');
		if ( isset( $_POST['edit_tip_id'] ) ) {
			$id = $_POST['edit_tip_id'];
			$tip_content = $_POST['new_tip'];
			//editing tip
			if ( $id > 0 ) {
				//update the original post
				wp_update_post( array( 'ID' => $id, 'post_content' => $tip_content ) );
				echo '<div id="message" class="updated fade"><p>Tip edited.</p></div>';
				//if the active tip, update site option
				if ( $id == $active_tip['id'] ) {
					update_site_option('active_tip', array( 'id' => $active_tip['id'], 'content' => $tip_content ) );
				}

			}
			//adding tip
			else if ( ! empty( $tip_content ) ) {
				if ( wp_insert_post(
						array('post_type' => 'tip', 'post_content' => $tip_content, 'post_status' => 'publish' )
					) )
					echo '<div id="message" class="updated fade"><p>New tip added.</p></div>';
			}
		}

		/* if not add/editing
		 * handle update of active tip, and deletions
		 */
		if ( isset( $_POST['tips_'] ) ) {
			//update 'active' tip
			$active = $_POST['tips_']['act'];
			$content = $active > 0 ?  get_post($active)->post_content : '';
			update_site_option('active_tip', array('id' => $active, 'content' => $content ) );

			//delete checked tips. do this after 'active' update, in case the active tip is being deleted, it can be reset
			if (isset($_POST['tips_']['del'])) {
				$del = $_POST['tips_']['del'];

				foreach( $del as $k => $id ) {
					//if deleting the active tip, be sure to remove it from the site options
					if ( $id == $active_tip['id'] )
						update_site_option('active_tip', $this->active_tip_default );
					wp_delete_post( $id, true );
				}
			}
		}
		/* this is where the page gets started
		 */
		echo '<div class="wrap">';
		echo '<h2>Network-wide Notices</h2>';
		echo '<form method="post">';

		/* setup 'add new' options
		 */
		$opts = array('content' => '', 'pid' => 0, 'button' => 'Add New Tip');

		/* change a few things if we're
		 * editing instead of adding
		 */
		if ( isset( $_POST['edit_tip'] ) ) {
			$tip = get_post($_POST['edit_tip']);
			if ( $tip->post_type != 'tip' ) break;
			$content = $tip->post_content;
			$opts = array('content' => $content, 'pid' => $_POST['edit_tip'], 'button' => 'Edit Tip');
		}

		/* build the editor
		 */
		extract( $opts );
		wp_editor( $content, 'new_tip', array(
			'media_buttons' => false,
			'textarea_rows' => 5,
		) );

		echo "<p>
		<input type='hidden' name='edit_tip_id' value='{$pid}' />
		<input type='submit' class='button-primary' value='{$button}' /></p>";
		echo '</form>';

		/* list all tips with actions
		 */
		?>
		<form method="post">
		<table class="wp-list-table widefat">
		<thead>
			<tr>
				<th id="cb" scope="col" class="column-cb check-column"><input type="checkbox" /></th>
				<th>Content</th>
				<th>Active&nbsp;Tip</th>
			</tr>
		</thead>
		<tfoot>
			<tr>
				<th scope="col" class="column-cb check-column"><input type="checkbox" /></th>
				<td>Content</td>
				<th>Active&nbsp;Tip</th>
			</tr>
		</tfoot>
		<?php

		/* get the active tip
		 */
		$active = get_site_option('active_tip', $this->active_tip_default );

		/* get all tips
		 */
		$tips = get_posts('post_type=tip&numberposts=-1');

		/* first row holds the 'none' option for Active Tips
		 */
		echo "<tr><th></th><td><em>none</em></td><td><input type='radio' name='tips_[act]' value='-1' ". checked( $active['id'], -1, false)."/></td></tr>";

		/* loops thru tips
		 */
		foreach( $tips as $tip ) {
			$chk = checked( $active['id'], $tip->ID, false );
			echo "<tr>
			<th class='check-column'><span><input type='checkbox' name='tips_[del][]' value='$tip->ID' /></span></th>
			<td>$tip->post_content
			<div class='row-actions'><button name='edit_tip' value='{$tip->ID}'>edit</button></div>
			</td>
			<td><span><input type='radio' name='tips_[act]' value='$tip->ID' {$chk}/></span></td>
			</tr>";
		}
		echo '</table>';
		echo '<p><input type="submit" class="button-primary" value="Update" /></p>';
		echo '</form>';
		echo '</div>';
	}

}//end class