plugin.php

<?php
/*
Plugin Name: SWDC Event Sponsors Widget
Description: Extends the Event Organiser plugin with a sponsor widget
Version: 1.0
Author: Fredrik Broman
Author URI: http://synack.se
Author Email: fredrik@synack.se
Text Domain: eosw
Domain Path: /lang/
Network: false
License: GPLv2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html

Copyright 2013 fredrik@synack.se

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2, as
published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

class SWDC_Event_Sponsors_Widget extends WP_Widget {

	/*--------------------------------------------------*/
	/* Constructor
	/*--------------------------------------------------*/

	/**
	 * Specifies the classname and description, instantiates the widget,
	 * loads localization files, and includes necessary stylesheets and JavaScript.
	 */
	public function __construct() {

		// load plugin text domain
		add_action( 'init', array( $this, 'widget_textdomain' ) );

		// Hooks fired when the Widget is activated and deactivated
		register_activation_hook( __FILE__, array( $this, 'activate' ) );
		register_deactivation_hook( __FILE__, array( $this, 'deactivate' ) );

		parent::__construct(
			'swdc-event-sponsors-widget',
			__( 'SWDC Event Sponsors Widget', 'eosw' ),
			array(
				'classname'		=>	'swdc-event-sponsors-widget',
				'description'	=>	__( 'Extends the Event Organiser plugin with a sponsor widget', 'eosw' )
			)
		);

		// Register admin styles and scripts
		// add_action( 'admin_print_styles', array( $this, 'register_admin_styles' ) );
		// add_action( 'admin_enqueue_scripts', array( $this, 'register_admin_scripts' ) );

		// Register site styles and scripts
		// add_action( 'wp_enqueue_scripts', array( $this, 'register_widget_styles' ) );
		// add_action( 'wp_enqueue_scripts', array( $this, 'register_widget_scripts' ) );

	} // end constructor

	/*--------------------------------------------------*/
	/* Widget API Functions
	/*--------------------------------------------------*/

	/**
	 * Outputs the content of the widget.
	 *
	 * @param	array	args		The array of form elements
	 * @param	array	instance	The current instance of the widget
	 */
	public function widget( $args, $instance ) {

		extract( $args, EXTR_SKIP );

		echo $before_widget;

		// TODO:	Here is where you manipulate your widget's values based on their input fields

		$eventid = $instance['eventid'];
		$html = $instance['html'];

		include( plugin_dir_path( __FILE__ ) . '/views/widget.php' );

		echo $after_widget;

	} // end widget

	/**
	 * Processes the widget's options to be saved.
	 *
	 * @param array $new_instance Values just sent to be saved.
	 * @param array $old_instance Previously saved values from database.
	 */
	public function update( $new_instance, $old_instance ) {

		$instance = $old_instance;

		$instance['eventid'] = ( !empty( $new_instance['eventid'] ) ) ? strip_tags( $new_instance['eventid'] ) : '';
		$instance['html'] = ( !empty( $new_instance['html'] ) ) ? $new_instance['html'] : '';

		return $instance;

	} // end widget

	/**
	 * Generates the administration form for the widget.
	 *
	 * @param	array	instance	The array of keys and values for the widget.
	 */
	public function form( $instance ) {

		$instance = wp_parse_args(
			(array) $instance
		);

		$eventid = isset($instance['eventid']) ? $instance['eventid'] : '-1';
		$html = isset($instance['html']) ? $instance['html'] : '';

		// Display the admin form
		include( plugin_dir_path(__FILE__) . '/views/admin.php' );

	} // end form

	/*--------------------------------------------------*/
	/* Public Functions
	/*--------------------------------------------------*/

	/**
	 * Loads the Widget's text domain for localization and translation.
	 */
	public function widget_textdomain() {

		load_plugin_textdomain( 'eosw', false, plugin_dir_path( __FILE__ ) . '/lang/' );

	} // end widget_textdomain

	/**
	 * Fired when the plugin is activated.
	 *
	 * @param		boolean	$network_wide	True if WPMU superadmin uses "Network Activate" action, false if WPMU is disabled or plugin is activated on an individual blog.
	 */
	public function activate( $network_wide ) {
		// TODO define activation functionality here
	} // end activate

	/**
	 * Fired when the plugin is deactivated.
	 *
	 * @param	boolean	$network_wide	True if WPMU superadmin uses "Network Activate" action, false if WPMU is disabled or plugin is activated on an individual blog
	 */
	public function deactivate( $network_wide ) {
		// TODO define deactivation functionality here
	} // end deactivate

	/**
	 * Registers and enqueues admin-specific styles.
	 */
	public function register_admin_styles() {
		wp_enqueue_style( 'swdc-event-sponsors-widget-admin-styles', plugins_url( 'swdc-event-sponsors-widget/css/admin.css' ) );

	} // end register_admin_styles

	/**
	 * Registers and enqueues admin-specific JavaScript.
	 */
	public function register_admin_scripts() {
		wp_enqueue_script( 'swdc-event-sponsors-widget-admin-script', plugins_url( 'swdc-event-sponsors-widget/js/admin.js' ), array('jquery') );

	} // end register_admin_scripts

	/**
	 * Registers and enqueues widget-specific styles.
	 */
	public function register_widget_styles() {
		wp_enqueue_style( 'swdc-event-sponsors-widget-widget-styles', plugins_url( 'swdc-event-sponsors-widget/css/widget.css' ) );

	} // end register_widget_styles

	/**
	 * Registers and enqueues widget-specific scripts.
	 */
	public function register_widget_scripts() {
		wp_enqueue_script( 'swdc-event-sponsors-widget-script', plugins_url( 'swdc-event-sponsors-widget/js/widget.js' ), array('jquery') );

	} // end register_widget_scripts

} // end class

add_action( 'widgets_init', create_function( '', 'register_widget("SWDC_Event_Sponsors_Widget");' ) );