application/hook/Layout.php

Layout.php

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
class Layout
{
	public $base_url;
	
	public function initx(){
	  return 'ok!';
	}
	/**
	 * Metodo que executa as implementacoes.
	 * Este metodo e chamado atraves do arquivo hooks.php
	 * na pasta config.
	 * 
	 * @return 
	 */
	public function init()
	{  
		$CI =& get_instance();
		$CI->load->library('parser');
		
		$this->base_url = $CI->config->slash_item('base_url');

        // Pegando a saida que o CI gera normalmente.
		$output = $CI->output->get_output();
        if(!isset($output) && $CI->view)
        {
                //@TODO: Tornar default a chamada das viewas
                $class  = $CI->router->class;
                $method = $CI->router->method;
                // Pegando o valor de title, se definido no controller.
                $data = (isset($CI->data)) ? $CI->data : array();
                $CI->load->view("$class/$method", $data);
                $output = $CI->output->get_output();
        }

		// Pegando o valor de title, se definido no controller.
		$title = (isset($CI->title)) ? $CI->title : '';
		
		// Links CSS definidos no controlador.
		$css = (isset($CI->css)) ? $this->createCSSLinks($CI->css) : '';
		
		// Links JS definidos no controlador.
		$js = (isset($CI->js)) ? $this->createJSLinks($CI->js) : '';
		
		// Se layout estiver definido e a regexp nao bater.
		if (isset($CI->layout) && !preg_match('/(.+).php$/', $CI->layout))
		{
			$CI->layout .= '.php';
		} 
		else 
		{
			$CI->layout = 'default.php';
		}
		
		// Definindo caminho completo do layout.
		$layout = LAYOUTPATH . $CI->layout;
		
		// Se o layout for diferente do default, e o arquivo nao existir.
		if ($CI->layout !== 'default.php' && !file_exists($layout))
		{
			// Exibe a mensagem, se o layout for diferente de '.php'.
			if ($CI->layout != '.php') show_error("You have specified a invalid layout: " . $CI->layout);
		}

                
		// Se o arquivo layout existir.
		if (file_exists($layout))
		{
			// Carrega o conteudo do  arquivo.
			$layout = $CI->load->file($layout, true);
			
			$data = array(
    			'title_for_layout' => $title,
                'css_for_layout' => $css,
                'js_for_layout' => $js,
                'content_for_layout' => $output
            );
			
			
  		    $view =  $CI->parser->parse('layouts/default.php', $data);
			
		} 
		else 
		{
			$view = $output;
		}

        $CI->output->set_output($view);
        $CI->output->_display();

	}
	

	private function createCSSLinks($links)
	{
		$html = "";

            if( is_array($links))
            {
		        for ($i = 0; $i < count($links); $i++)
		        {
			        $html .= "<link rel='stylesheet' type='text/css' href='" . $this->base_url . CSSPATH . $links[$i] . ".css' media='screen' />\n";
		        }
            }else{
                $html .= "<link rel='stylesheet' type='text/css' href='" . $this->base_url . CSSPATH . $links . ".css' media='screen' />\n";
            }
		
		return $html;
		
	}
	
	private function createJSLinks($links)
	{
		$html = "";
		
		for ($i = 0; $i < count($links); $i++)
		{
			$html .= "<script type='text/javascript' src='" . $this->base_url . JSPATH . $links[$i] . ".js'></script> \n";
		}
		
		return $html;
	}
}