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EDIT :: class.admin_page.php

<?php

/**
 * Admin Page
 * Pages are part of a Menu
 * @package Simple Lightbox
 * @subpackage Admin
 * @author Archetyped
 */
class SLB_Admin_Page extends SLB_Admin_View {
	/* Properties */
	
	protected $parent_required = true;
	
	public $hook_prefix = 'admin_page';
	
	/**
	 * Required features/elements
	 */
	private $_required = array();
	
	/* Init */
	
	public function __construct($id, $parent, $labels, $callback = null, $capability = null, $icon = null) {
		// Default
		parent::__construct($id, $labels, $callback, $capability, $icon);
		// Class specific
		$this->set_parent($parent);
		return $this;
	}
	
	/* Operations */
	
	protected function show_icon() {
		echo screen_icon();
	}
	
	/**
	 * Add content to page
	 * @uses parent::add_content()
	 * @param string $id Module ID
	 * @param string $title Module title
	 * @param mixed $callback Callback method or other data for building module UI
	 * @param string $context (optional) Context to add module to (Default: primary)
	 * @param string $priority (optional) Controls module ordering (Default: default)
	 * @param array $callback_args (optional) Additional data to pass callback (Default: NULL)
	 * @return object Page instance reference
	 */
	public function add_content($id, $title, $callback = null, $context = 'primary', $priority = 'default', $callback_args = null) {
		return parent::add_content($id, array(
			'id'			=> $id,
			'title'			=> $title,
			'callback'		=> $callback,
			'context'		=> $context,
			'priority'		=> $priority,
			'callback_args'	=> $callback_args
			)
		);
	}
	
	/**
	 * Parse content by parameters
	 * Sets content value
	 */
	protected function parse_content() {
		// Get raw content
		$raw = $this->get_content(false);
		// Group by context
		$content = array();
		foreach ( $raw as $c ) {
			// Add new context
			if ( !isset($content[$c->context]) ) {
				$content[$c->context] = array();
			}
			// Add item to context
			$content[$c->context][] = $c;
		}
		return $content;
	}
	
	/**
	 * Render content blocks
	 * @param string $context (optional) Context to render
	 */
	protected function render_content($context = 'primary') {
		// Get content
		$content = $this->get_content();
		// Check for context
		if ( !isset($content[$context]) ) {
			return false;
		}
		$content = $content[$context];
		$out = '';
		// Render content
		?>
		<div class="content-wrap">
		<?php
			// Add meta boxes
			$screen = get_current_screen();
			foreach ( $content as $c ) {
				$c->screen = $screen;
				// Callback
				if ( is_callable($c->callback) ) {
					$callback = $c->callback;
					add_meta_box($c->id, $c->title, $c->callback, $c->screen, $c->context, $c->priority, $c->callback_args);
				} else {
					// Let handlers build output
					$this->util->do_action('render_content', $c->callback, $this, $c);
				}
			}
			// Output meta boxes
			do_meta_boxes($screen, $context, null);
		?>
		</div>
		<?php
	}
	
	/**
	 * Require form submission support
	 * @return obj Page instance
	 */
	public function require_form() {
		$this->_require('form_submit');
		return $this;
	}
	
	/**
	 * Check if form submission is required
	 * @return bool TRUE if form submission required
	 */
	private function is_required_form() {
		return $this->_is_required('form_submit');
	}
	
	/* Handlers */
	
	/**
	 * Default Page handler
	 * Builds content blocks
	 * @see this->init_menus() Set as callback for custom admin pages
	 * @uses current_user_can() to check if user has access to current page
	 * @uses wp_die() to end execution when user does not have permission to access page
	 */
	public function handle() {
		if ( !current_user_can($this->get_capability()) )
			wp_die(__('Access Denied', 'simple-lightbox'));
		wp_enqueue_script('postbox');
		?>
		<div class="wrap slb">
			<?php $this->show_icon(); ?>
			<h2><?php esc_html_e( $this->get_label('header') ); ?></h2>
			<?php
				// Form submission support
				if ( $this->is_required_form() ) {
					// Build form output
					$form_id = $this->add_prefix('admin_form_' . $this->get_id_raw());
					?>
					<form id="<?php esc_attr_e($form_id); ?>" name="<?php esc_attr_e($form_id); ?>" action="" method="post">
					<?php
				}
			?>
			<div class="metabox-holder columns-2">
				<div class="content-primary postbox-container">
					<?php
					$this->render_content('primary');
					?>
				</div>
				<div class="content-secondary postbox-container">
					<?php
					$this->render_content('secondary');
					?>
				</div>
			</div>
			<br class="clear" />
			<?php
				// Form submission support
				if ( $this->is_required_form() ) {
					submit_button();
					?>
					</form>
					<?php
				}
			?>
		</div>
		<?php
	}
}

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EDIT :: class.admin_page.php